NFC: Initial LLCP support
authorSamuel Ortiz <sameo@linux.intel.com>
Wed, 14 Dec 2011 15:43:12 +0000 (16:43 +0100)
committerJohn W. Linville <linville@tuxdriver.com>
Wed, 14 Dec 2011 19:50:13 +0000 (14:50 -0500)
This patch is an initial implementation for the NFC Logical Link Control
protocol. It's also known as NFC peer to peer mode.
This is a basic implementation as it lacks SDP (services Discovery
Protocol), frames aggregation support, and frame rejecion parsing.
Follow up patches will implement those missing features.
This code has been tested against a Nexus S phone implementing LLCP 1.0.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
include/linux/nfc.h
net/nfc/Kconfig
net/nfc/Makefile
net/nfc/core.c
net/nfc/llcp/Kconfig [new file with mode: 0644]
net/nfc/llcp/commands.c [new file with mode: 0644]
net/nfc/llcp/llcp.c [new file with mode: 0644]
net/nfc/llcp/llcp.h [new file with mode: 0644]
net/nfc/llcp/sock.c [new file with mode: 0644]
net/nfc/nfc.h

index 34d8303111f059f38aa32b855bda2a4053e6f853..89fee4ab1904784e7c748a1cbcb95fb053c9e36b 100644 (file)
@@ -139,9 +139,22 @@ struct sockaddr_nfc {
        __u32 nfc_protocol;
 };
 
+#define NFC_LLCP_MAX_SERVICE_NAME 63
+struct sockaddr_nfc_llcp {
+       sa_family_t sa_family;
+       __u32 dev_idx;
+       __u32 target_idx;
+       __u32 nfc_protocol;
+       __u8 dsap; /* Destination SAP, if known */
+       __u8 ssap; /* Source SAP to be bound to */
+       char service_name[NFC_LLCP_MAX_SERVICE_NAME]; /* Service name URI */;
+       size_t service_name_len;
+};
+
 /* NFC socket protocols */
 #define NFC_SOCKPROTO_RAW      0
-#define NFC_SOCKPROTO_MAX      1
+#define NFC_SOCKPROTO_LLCP     1
+#define NFC_SOCKPROTO_MAX      2
 
 #define NFC_HEADER_SIZE 1
 
index 58cddadf8e8e2dfb5a915d621bebdc42b032609e..44c865b86d6f56f5324f63ad66b38c309cda8247 100644 (file)
@@ -14,5 +14,6 @@ menuconfig NFC
          be called nfc.
 
 source "net/nfc/nci/Kconfig"
+source "net/nfc/llcp/Kconfig"
 
 source "drivers/nfc/Kconfig"
index fbb550f2377b9298f755ee5a63428d9f93a06b69..7b4a6dcfa566b93a5f725daeceb5936797f2034c 100644 (file)
@@ -6,3 +6,4 @@ obj-$(CONFIG_NFC) += nfc.o
 obj-$(CONFIG_NFC_NCI) += nci/
 
 nfc-objs := core.o netlink.o af_nfc.o rawsock.o
+nfc-$(CONFIG_NFC_LLCP) += llcp/llcp.o llcp/commands.o llcp/sock.o
index 3a45f21b3b97ee2fbce1ef9989bf6979746fa500..3ddf6e698df0569c2f8aafbb19cecd4fa15b9aa4 100644 (file)
@@ -240,6 +240,7 @@ int nfc_dep_link_down(struct nfc_dev *dev)
        rc = dev->ops->dep_link_down(dev);
        if (!rc) {
                dev->dep_link_up = false;
+               nfc_llcp_mac_is_down(dev);
                nfc_genl_dep_link_down_event(dev);
        }
 
@@ -254,6 +255,8 @@ int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
        dev->dep_link_up = true;
        dev->dep_rf_mode = rf_mode;
 
+       nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
+
        return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
 }
 EXPORT_SYMBOL(nfc_dep_link_is_up);
@@ -360,13 +363,13 @@ int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
        if (gb_len > NFC_MAX_GT_LEN)
                return -EINVAL;
 
-       return 0;
+       return nfc_llcp_set_remote_gb(dev, gb, gb_len);
 }
 EXPORT_SYMBOL(nfc_set_remote_general_bytes);
 
 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, u8 *gt_len)
 {
-       return NULL;
+       return nfc_llcp_general_bytes(dev, gt_len);
 }
 EXPORT_SYMBOL(nfc_get_local_general_bytes);
 
@@ -560,6 +563,10 @@ int nfc_register_device(struct nfc_dev *dev)
        if (rc < 0)
                return rc;
 
+       rc = nfc_llcp_register_device(dev);
+       if (rc)
+               pr_err("Could not register llcp device\n");
+
        rc = nfc_genl_device_added(dev);
        if (rc)
                pr_debug("The userspace won't be notified that the device %s was added\n",
@@ -591,6 +598,8 @@ void nfc_unregister_device(struct nfc_dev *dev)
 
        mutex_unlock(&nfc_devlist_mutex);
 
+       nfc_llcp_unregister_device(dev);
+
        rc = nfc_genl_device_removed(dev);
        if (rc)
                pr_debug("The userspace won't be notified that the device %s was removed\n",
@@ -620,6 +629,10 @@ static int __init nfc_init(void)
        if (rc)
                goto err_rawsock;
 
+       rc = nfc_llcp_init();
+       if (rc)
+               goto err_llcp_sock;
+
        rc = af_nfc_init();
        if (rc)
                goto err_af_nfc;
@@ -627,6 +640,8 @@ static int __init nfc_init(void)
        return 0;
 
 err_af_nfc:
+       nfc_llcp_exit();
+err_llcp_sock:
        rawsock_exit();
 err_rawsock:
        nfc_genl_exit();
@@ -638,6 +653,7 @@ err_genl:
 static void __exit nfc_exit(void)
 {
        af_nfc_exit();
+       nfc_llcp_exit();
        rawsock_exit();
        nfc_genl_exit();
        class_unregister(&nfc_class);
diff --git a/net/nfc/llcp/Kconfig b/net/nfc/llcp/Kconfig
new file mode 100644 (file)
index 0000000..fbf5e81
--- /dev/null
@@ -0,0 +1,7 @@
+config NFC_LLCP
+       depends on NFC && EXPERIMENTAL
+       bool "NFC LLCP support (EXPERIMENTAL)"
+       default n
+       help
+        Say Y here if you want to build support for a kernel NFC LLCP
+        implementation.
\ No newline at end of file
diff --git a/net/nfc/llcp/commands.c b/net/nfc/llcp/commands.c
new file mode 100644 (file)
index 0000000..151f2ef
--- /dev/null
@@ -0,0 +1,399 @@
+/*
+ * 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/module.h>
+#include <linux/nfc.h>
+
+#include <net/nfc/nfc.h>
+
+#include "../nfc.h"
+#include "llcp.h"
+
+static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
+       0,
+       1, /* VERSION */
+       2, /* MIUX */
+       2, /* WKS */
+       1, /* LTO */
+       1, /* RW */
+       0, /* SN */
+       1, /* OPT */
+       0, /* SDREQ */
+       2, /* SDRES */
+
+};
+
+static u8 llcp_tlv8(u8 *tlv, u8 type)
+{
+       if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
+               return 0;
+
+       return tlv[2];
+}
+
+static u8 llcp_tlv16(u8 *tlv, u8 type)
+{
+       if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
+               return 0;
+
+       return be16_to_cpu(*((__be16 *)(tlv + 2)));
+}
+
+
+static u8 llcp_tlv_version(u8 *tlv)
+{
+       return llcp_tlv8(tlv, LLCP_TLV_VERSION);
+}
+
+static u16 llcp_tlv_miux(u8 *tlv)
+{
+       return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7f;
+}
+
+static u16 llcp_tlv_wks(u8 *tlv)
+{
+       return llcp_tlv16(tlv, LLCP_TLV_WKS);
+}
+
+static u16 llcp_tlv_lto(u8 *tlv)
+{
+       return llcp_tlv8(tlv, LLCP_TLV_LTO);
+}
+
+static u8 llcp_tlv_opt(u8 *tlv)
+{
+       return llcp_tlv8(tlv, LLCP_TLV_OPT);
+}
+
+static u8 llcp_tlv_rw(u8 *tlv)
+{
+       return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
+}
+
+u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
+{
+       u8 *tlv, length;
+
+       pr_debug("type %d\n", type);
+
+       if (type >= LLCP_TLV_MAX)
+               return NULL;
+
+       length = llcp_tlv_length[type];
+       if (length == 0 && value_length == 0)
+               return NULL;
+       else
+               length = value_length;
+
+       *tlv_length = 2 + length;
+       tlv = kzalloc(2 + length, GFP_KERNEL);
+       if (tlv == NULL)
+               return tlv;
+
+       tlv[0] = type;
+       tlv[1] = length;
+       memcpy(tlv + 2, value, length);
+
+       return tlv;
+}
+
+int nfc_llcp_parse_tlv(struct nfc_llcp_local *local,
+                       u8 *tlv_array, u16 tlv_array_len)
+{
+       u8 *tlv = tlv_array, type, length, offset = 0;
+
+       pr_debug("TLV array length %d\n", tlv_array_len);
+
+       if (local == NULL)
+               return -ENODEV;
+
+       while (offset < tlv_array_len) {
+               type = tlv[0];
+               length = tlv[1];
+
+               pr_debug("type 0x%x length %d\n", type, length);
+
+               switch (type) {
+               case LLCP_TLV_VERSION:
+                       local->remote_version = llcp_tlv_version(tlv);
+                       break;
+               case LLCP_TLV_MIUX:
+                       local->remote_miu = llcp_tlv_miux(tlv) + 128;
+                       break;
+               case LLCP_TLV_WKS:
+                       local->remote_wks = llcp_tlv_wks(tlv);
+                       break;
+               case LLCP_TLV_LTO:
+                       local->remote_lto = llcp_tlv_lto(tlv) * 10;
+                       break;
+               case LLCP_TLV_OPT:
+                       local->remote_opt = llcp_tlv_opt(tlv);
+                       break;
+               case LLCP_TLV_RW:
+                       local->remote_rw = llcp_tlv_rw(tlv);
+                       break;
+               default:
+                       pr_err("Invalid gt tlv value 0x%x\n", type);
+                       break;
+               }
+
+               offset += length + 2;
+               tlv += length + 2;
+       }
+
+       pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x rw %d\n",
+               local->remote_version, local->remote_miu,
+               local->remote_lto, local->remote_opt,
+               local->remote_wks, local->remote_rw);
+
+       return 0;
+}
+
+static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
+                                       u8 dsap, u8 ssap, u8 ptype)
+{
+       u8 header[2];
+
+       pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
+
+       header[0] = (u8)((dsap << 2) | (ptype >> 2));
+       header[1] = (u8)((ptype << 6) | ssap);
+
+       pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
+
+       memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
+
+       return pdu;
+}
+
+static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, u8 tlv_length)
+{
+       /* XXX Add an skb length check */
+
+       if (tlv == NULL)
+               return NULL;
+
+       memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
+
+       return pdu;
+}
+
+static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
+                                                       u8 cmd, u16 size)
+{
+       struct sk_buff *skb;
+       int err;
+
+       if (sock->ssap == 0)
+               return NULL;
+
+       skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
+                                       size + LLCP_HEADER_SIZE, &err);
+       if (skb == NULL) {
+               pr_err("Could not allocate PDU\n");
+               return NULL;
+       }
+
+       skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
+
+       return skb;
+}
+
+int nfc_llcp_disconnect(struct nfc_llcp_sock *sock)
+{
+       struct sk_buff *skb;
+       struct nfc_dev *dev;
+       struct nfc_llcp_local *local;
+       u16 size = 0;
+
+       pr_debug("Sending DISC\n");
+
+       local = sock->local;
+       if (local == NULL)
+               return -ENODEV;
+
+       dev = sock->dev;
+       if (dev == NULL)
+               return -ENODEV;
+
+       size += LLCP_HEADER_SIZE;
+       size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
+
+       skb = alloc_skb(size, GFP_ATOMIC);
+       if (skb == NULL)
+               return -ENOMEM;
+
+       skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
+
+       skb = llcp_add_header(skb, sock->ssap, sock->dsap, LLCP_PDU_DISC);
+
+       skb_queue_tail(&local->tx_queue, skb);
+
+       return 0;
+}
+
+int nfc_llcp_send_symm(struct nfc_dev *dev)
+{
+       struct sk_buff *skb;
+       struct nfc_llcp_local *local;
+       u16 size = 0;
+
+       pr_debug("Sending SYMM\n");
+
+       local = nfc_llcp_find_local(dev);
+       if (local == NULL)
+               return -ENODEV;
+
+       size += LLCP_HEADER_SIZE;
+       size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
+
+       skb = alloc_skb(size, GFP_KERNEL);
+       if (skb == NULL)
+               return -ENOMEM;
+
+       skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
+
+       skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
+
+       return nfc_data_exchange(dev, local->target_idx, skb,
+                                       nfc_llcp_recv, local);
+}
+
+int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
+{
+       struct nfc_llcp_local *local;
+       struct sk_buff *skb;
+       u8 *service_name_tlv = NULL, service_name_tlv_length;
+       int err;
+       u16 size = 0;
+
+       pr_debug("Sending CONNECT\n");
+
+       local = sock->local;
+       if (local == NULL)
+               return -ENODEV;
+
+       if (sock->service_name != NULL) {
+               service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
+                                       sock->service_name,
+                                       sock->service_name_len,
+                                       &service_name_tlv_length);
+               size += service_name_tlv_length;
+       }
+
+       pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
+
+       skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
+       if (skb == NULL) {
+               err = -ENOMEM;
+               goto error_tlv;
+       }
+
+       if (service_name_tlv != NULL)
+               skb = llcp_add_tlv(skb, service_name_tlv,
+                                       service_name_tlv_length);
+
+       skb_queue_tail(&local->tx_queue, skb);
+
+       return 0;
+
+error_tlv:
+       pr_err("error %d\n", err);
+
+       kfree(service_name_tlv);
+
+       return err;
+}
+
+int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
+{
+       struct nfc_llcp_local *local;
+       struct sk_buff *skb;
+
+       pr_debug("Sending CC\n");
+
+       local = sock->local;
+       if (local == NULL)
+               return -ENODEV;
+
+       skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, 0);
+       if (skb == NULL)
+               return -ENOMEM;
+
+       skb_queue_tail(&local->tx_queue, skb);
+
+       return 0;
+}
+
+int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
+{
+       struct sk_buff *skb;
+       struct nfc_dev *dev;
+       u16 size = 1; /* Reason code */
+
+       pr_debug("Sending DM reason 0x%x\n", reason);
+
+       if (local == NULL)
+               return -ENODEV;
+
+       dev = local->dev;
+       if (dev == NULL)
+               return -ENODEV;
+
+       size += LLCP_HEADER_SIZE;
+       size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
+
+       skb = alloc_skb(size, GFP_KERNEL);
+       if (skb == NULL)
+               return -ENOMEM;
+
+       skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
+
+       skb = llcp_add_header(skb, ssap, dsap, LLCP_PDU_DM);
+
+       memcpy(skb_put(skb, 1), &reason, 1);
+
+       skb_queue_head(&local->tx_queue, skb);
+
+       return 0;
+}
+
+int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
+{
+       struct sk_buff *skb;
+       struct nfc_llcp_local *local;
+
+       pr_debug("Send DISC\n");
+
+       local = sock->local;
+       if (local == NULL)
+               return -ENODEV;
+
+       skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
+       if (skb == NULL)
+               return -ENOMEM;
+
+       skb_queue_head(&local->tx_queue, skb);
+
+       return 0;
+}
diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
new file mode 100644 (file)
index 0000000..67756b2
--- /dev/null
@@ -0,0 +1,973 @@
+/*
+ * 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_socket_release(struct nfc_llcp_local *local)
+{
+       struct nfc_llcp_sock *parent, *s, *n;
+       struct sock *sk, *parent_sk;
+       int i;
+
+
+       mutex_lock(&local->socket_lock);
+
+       for (i = 0; i < LLCP_MAX_SAP; i++) {
+               parent = local->sockets[i];
+               if (parent == NULL)
+                       continue;
+
+               /* Release all child sockets */
+               list_for_each_entry_safe(s, n, &parent->list, list) {
+                       list_del(&s->list);
+                       sk = &s->sk;
+
+                       lock_sock(sk);
+
+                       if (sk->sk_state == LLCP_CONNECTED)
+                               nfc_put_device(s->dev);
+
+                       sk->sk_state = LLCP_CLOSED;
+                       sock_set_flag(sk, SOCK_DEAD);
+
+                       release_sock(sk);
+               }
+
+               parent_sk = &parent->sk;
+
+               lock_sock(parent_sk);
+
+               if (parent_sk->sk_state == LLCP_LISTEN) {
+                       struct nfc_llcp_sock *lsk, *n;
+                       struct sock *accept_sk;
+
+                       list_for_each_entry_safe(lsk, n, &parent->accept_queue,
+                                                               accept_queue) {
+                               accept_sk = &lsk->sk;
+                               lock_sock(accept_sk);
+
+                               nfc_llcp_accept_unlink(accept_sk);
+
+                               accept_sk->sk_state = LLCP_CLOSED;
+                               sock_set_flag(accept_sk, SOCK_DEAD);
+
+                               release_sock(accept_sk);
+
+                               sock_orphan(accept_sk);
+                       }
+               }
+
+               if (parent_sk->sk_state == LLCP_CONNECTED)
+                       nfc_put_device(parent->dev);
+
+               parent_sk->sk_state = LLCP_CLOSED;
+               sock_set_flag(parent_sk, SOCK_DEAD);
+
+               release_sock(parent_sk);
+       }
+
+       mutex_unlock(&local->socket_lock);
+}
+
+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");
+
+       queue_work(local->timeout_wq, &local->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;
+}
+
+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(BIT(ssap), &local->local_wks);
+                       mutex_unlock(&local->sdp_lock);
+
+                       return ssap;
+               }
+
+               /*
+                * This is not a well known service,
+                * we should try to find a local SDP free spot
+                */
+               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(BIT(ssap), &local->local_sdp);
+               mutex_unlock(&local->sdp_lock);
+
+               return LLCP_WKS_NUM_SAP + ssap;
+
+       } else if (sock->ssap != 0) {
+               if (sock->ssap < LLCP_WKS_NUM_SAP) {
+                       if (!(local->local_wks & BIT(sock->ssap))) {
+                               set_bit(BIT(sock->ssap), &local->local_wks);
+                               mutex_unlock(&local->sdp_lock);
+
+                               return sock->ssap;
+                       }
+
+               } else if (sock->ssap < LLCP_SDP_NUM_SAP) {
+                       if (!(local->local_sdp &
+                               BIT(sock->ssap - LLCP_WKS_NUM_SAP))) {
+                               set_bit(BIT(sock->ssap - LLCP_WKS_NUM_SAP),
+                                                       &local->local_sdp);
+                               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(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) {
+               local_ssap = ssap - LLCP_WKS_NUM_SAP;
+               sdp = &local->local_sdp;
+       } 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(1 << local_ssap, sdp);
+
+       mutex_unlock(&local->sdp_lock);
+}
+
+u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, u8 *general_bytes_len)
+{
+       struct nfc_llcp_local *local;
+
+       local = nfc_llcp_find_local(dev);
+       if (local == NULL) {
+               *general_bytes_len = 0;
+               return NULL;
+       }
+
+       *general_bytes_len = local->gb_len;
+
+       return local->gb;
+}
+
+static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
+{
+       u8 *gb_cur, *version_tlv, version, version_length;
+       u8 *lto_tlv, lto, lto_length;
+       u8 *wks_tlv, wks_length;
+       u8 gb_len = 0;
+
+       version = LLCP_VERSION_11;
+       version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
+                                                       1, &version_length);
+       gb_len += version_length;
+
+       /* 1500 ms */
+       lto = 150;
+       lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &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;
+
+       gb_len += ARRAY_SIZE(llcp_magic);
+
+       if (gb_len > NFC_MAX_GT_LEN) {
+               kfree(version_tlv);
+               return -EINVAL;
+       }
+
+       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;
+
+       kfree(version_tlv);
+       kfree(lto_tlv);
+
+       local->gb_len = gb_len;
+
+       return 0;
+}
+
+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;
+       }
+
+       memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
+       memcpy(local->remote_gb, gb, gb_len);
+       local->remote_gb_len = gb_len;
+
+       if (local->remote_gb == NULL ||
+                       local->remote_gb_len == 0)
+               return -ENODEV;
+
+       if (memcmp(local->remote_gb, llcp_magic, 3)) {
+               pr_err("MAC does not support LLCP\n");
+               return -EINVAL;
+       }
+
+       return nfc_llcp_parse_tlv(local,
+                       &local->remote_gb[3], local->remote_gb_len - 3);
+}
+
+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;
+
+       skb = skb_dequeue(&local->tx_queue);
+       if (skb != NULL) {
+               pr_debug("Sending pending skb\n");
+               nfc_data_exchange(local->dev, local->target_idx,
+                                       skb, nfc_llcp_recv, local);
+       } else {
+               nfc_llcp_send_symm(local->dev);
+       }
+
+       mod_timer(&local->link_timer,
+                       jiffies + msecs_to_jiffies(local->remote_lto));
+}
+
+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 - 1) % 16);
+       sock->send_n = (sock->send_n + 1) % 16;
+       sock->recv_ack_n = (sock->recv_n - 1) % 16;
+}
+
+static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
+                                               u8 ssap, u8 dsap)
+{
+       struct nfc_llcp_sock *sock, *llcp_sock, *n;
+
+       if (ssap == 0 && dsap == 0)
+               return NULL;
+
+       mutex_lock(&local->socket_lock);
+       sock = local->sockets[ssap];
+       if (sock == NULL) {
+               mutex_unlock(&local->socket_lock);
+               return NULL;
+       }
+
+       pr_debug("root dsap %d (%d)\n", sock->dsap, dsap);
+
+       if (sock->dsap == dsap) {
+               sock_hold(&sock->sk);
+               mutex_unlock(&local->socket_lock);
+               return sock;
+       }
+
+       list_for_each_entry_safe(llcp_sock, n, &sock->list, list) {
+               pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock,
+                               &llcp_sock->sk, llcp_sock->dsap);
+               if (llcp_sock->dsap == dsap) {
+                       sock_hold(&llcp_sock->sk);
+                       mutex_unlock(&local->socket_lock);
+                       return llcp_sock;
+               }
+       }
+
+       pr_err("Could not find socket for %d %d\n", ssap, dsap);
+
+       mutex_unlock(&local->socket_lock);
+
+       return NULL;
+}
+
+static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
+{
+       sock_put(&sock->sk);
+}
+
+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_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, bound_sap, reason;
+
+       dsap = nfc_llcp_dsap(skb);
+       ssap = nfc_llcp_ssap(skb);
+
+       pr_debug("%d %d\n", dsap, ssap);
+
+       nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
+                               skb->len - LLCP_HEADER_SIZE);
+
+       if (dsap != LLCP_SAP_SDP) {
+               bound_sap = dsap;
+
+               mutex_lock(&local->socket_lock);
+               sock = local->sockets[dsap];
+               if (sock == NULL) {
+                       mutex_unlock(&local->socket_lock);
+                       reason = LLCP_DM_NOBOUND;
+                       goto fail;
+               }
+
+               sock_hold(&sock->sk);
+               mutex_unlock(&local->socket_lock);
+
+               lock_sock(&sock->sk);
+
+               if (sock->dsap == LLCP_SAP_SDP &&
+                               sock->sk.sk_state == LLCP_LISTEN)
+                       goto enqueue;
+       } 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);
+
+               mutex_lock(&local->socket_lock);
+               for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET;
+                                                               bound_sap++) {
+                       sock = local->sockets[bound_sap];
+                       if (sock == NULL)
+                               continue;
+
+                       if (sock->service_name == NULL ||
+                               sock->service_name_len == 0)
+                                       continue;
+
+                       if (sock->service_name_len != sn_len)
+                               continue;
+
+                       if (sock->dsap == LLCP_SAP_SDP &&
+                                       sock->sk.sk_state == LLCP_LISTEN &&
+                                       !memcmp(sn, sock->service_name, sn_len)) {
+                               pr_debug("Found service name at SAP %d\n",
+                                                               bound_sap);
+                               sock_hold(&sock->sk);
+                               mutex_unlock(&local->socket_lock);
+
+                               lock_sock(&sock->sk);
+
+                               goto enqueue;
+                       }
+               }
+
+       }
+
+       mutex_unlock(&local->socket_lock);
+
+       reason = LLCP_DM_NOBOUND;
+       goto fail;
+
+enqueue:
+       parent = &sock->sk;
+
+       if (sk_acceptq_is_full(parent)) {
+               reason = LLCP_DM_REJ;
+               release_sock(&sock->sk);
+               sock_put(&sock->sk);
+               goto fail;
+       }
+
+       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 = local;
+       new_sock->nfc_protocol = sock->nfc_protocol;
+       new_sock->ssap = bound_sap;
+       new_sock->dsap = ssap;
+       new_sock->parent = parent;
+
+       pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
+
+       list_add_tail(&new_sock->list, &sock->list);
+
+       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);
+
+       return;
+
+}
+
+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);
+       }
+
+       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");
+
+       /* Pass the payload upstream */
+       if (ptype == LLCP_PDU_I) {
+               pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
+
+               skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
+               if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
+                       pr_err("receive queue is full\n");
+                       skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
+               }
+       }
+
+       /* Remove skbs from the pending queue */
+       if (llcp_sock->send_ack_n != nr) {
+               struct sk_buff *s, *tmp;
+
+               llcp_sock->send_ack_n = nr;
+
+               skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
+                       if (nfc_llcp_ns(s) <= nr) {
+                               skb_unlink(s, &llcp_sock->tx_pending_queue);
+                               kfree_skb(s);
+                       }
+       }
+
+       /* Queue some I frames for transmission */
+       while (llcp_sock->remote_ready &&
+               skb_queue_len(&llcp_sock->tx_pending_queue) <= local->remote_rw) {
+               struct sk_buff *pdu, *pending_pdu;
+
+               pdu = skb_dequeue(&llcp_sock->tx_queue);
+               if (pdu == NULL)
+                       break;
+
+               /* Update N(S)/N(R) */
+               nfc_llcp_set_nrns(llcp_sock, pdu);
+
+               pending_pdu = skb_clone(pdu, GFP_KERNEL);
+
+               skb_queue_tail(&local->tx_queue, pdu);
+               skb_queue_tail(&llcp_sock->tx_pending_queue, pending_pdu);
+       }
+
+       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);
+
+       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);
+       }
+
+
+       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;
+       u8 dsap, ssap;
+
+
+       dsap = nfc_llcp_dsap(skb);
+       ssap = nfc_llcp_ssap(skb);
+
+       llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
+
+       if (llcp_sock == NULL)
+               llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
+
+       if (llcp_sock == NULL) {
+               pr_err("Invalid CC\n");
+               nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
+
+               return;
+       }
+
+       llcp_sock->dsap = ssap;
+
+       nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
+                               skb->len - LLCP_HEADER_SIZE);
+
+       nfc_llcp_sock_put(llcp_sock);
+}
+
+static void nfc_llcp_rx_work(struct work_struct *work)
+{
+       struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
+                                                               rx_work);
+       u8 dsap, ssap, ptype;
+       struct sk_buff *skb;
+
+       skb = local->rx_pending;
+       if (skb == NULL) {
+               pr_debug("No pending SKB\n");
+               return;
+       }
+
+       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);
+
+       switch (ptype) {
+       case LLCP_PDU_SYMM:
+               pr_debug("SYMM\n");
+               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_I:
+       case LLCP_PDU_RR:
+               pr_debug("I frame\n");
+               nfc_llcp_recv_hdlc(local, skb);
+               break;
+
+       }
+
+       queue_work(local->tx_wq, &local->tx_work);
+       kfree_skb(local->rx_pending);
+       local->rx_pending = NULL;
+
+       return;
+}
+
+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", err);
+               return;
+       }
+
+       local->rx_pending = skb_get(skb);
+       del_timer(&local->link_timer);
+       queue_work(local->rx_wq, &local->rx_work);
+
+       return;
+}
+
+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;
+
+       /* Close and purge all existing sockets */
+       nfc_llcp_socket_release(local);
+}
+
+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");
+
+               queue_work(local->tx_wq, &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 device *dev = &ndev->dev;
+       struct nfc_llcp_local *local;
+       char name[32];
+       int err;
+
+       local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
+       if (local == NULL)
+               return -ENOMEM;
+
+       local->dev = ndev;
+       INIT_LIST_HEAD(&local->list);
+       mutex_init(&local->sdp_lock);
+       mutex_init(&local->socket_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);
+       snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
+       local->tx_wq = alloc_workqueue(name,
+                       WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
+       if (local->tx_wq == NULL) {
+               err = -ENOMEM;
+               goto err_local;
+       }
+
+       local->rx_pending = NULL;
+       INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
+       snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
+       local->rx_wq = alloc_workqueue(name,
+                       WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
+       if (local->rx_wq == NULL) {
+               err = -ENOMEM;
+               goto err_tx_wq;
+       }
+
+       INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
+       snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
+       local->timeout_wq = alloc_workqueue(name,
+                       WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
+       if (local->timeout_wq == NULL) {
+               err = -ENOMEM;
+               goto err_rx_wq;
+       }
+
+       nfc_llcp_build_gb(local);
+
+       local->remote_miu = LLCP_DEFAULT_MIU;
+       local->remote_lto = LLCP_DEFAULT_LTO;
+       local->remote_rw = LLCP_DEFAULT_RW;
+
+       list_add(&llcp_devices, &local->list);
+
+       return 0;
+
+err_rx_wq:
+       destroy_workqueue(local->rx_wq);
+
+err_tx_wq:
+       destroy_workqueue(local->tx_wq);
+
+err_local:
+       kfree(local);
+
+       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;
+       }
+
+       list_del(&local->list);
+       nfc_llcp_socket_release(local);
+       del_timer_sync(&local->link_timer);
+       skb_queue_purge(&local->tx_queue);
+       destroy_workqueue(local->tx_wq);
+       destroy_workqueue(local->rx_wq);
+       kfree(local->rx_pending);
+       kfree(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();
+}
diff --git a/net/nfc/llcp/llcp.h b/net/nfc/llcp/llcp.h
new file mode 100644 (file)
index 0000000..0ad2e33
--- /dev/null
@@ -0,0 +1,193 @@
+/*
+ * 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.
+ */
+
+enum llcp_state {
+       LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
+       LLCP_CLOSED,
+       LLCP_BOUND,
+       LLCP_LISTEN,
+};
+
+#define LLCP_DEFAULT_LTO 100
+#define LLCP_DEFAULT_RW  1
+#define LLCP_DEFAULT_MIU 128
+
+#define LLCP_WKS_NUM_SAP   16
+#define LLCP_SDP_NUM_SAP   16
+#define LLCP_LOCAL_NUM_SAP 32
+#define LLCP_LOCAL_SAP_OFFSET (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP)
+#define LLCP_MAX_SAP (LLCP_WKS_NUM_SAP + LLCP_SDP_NUM_SAP + LLCP_LOCAL_NUM_SAP)
+
+struct nfc_llcp_sock;
+
+struct nfc_llcp_local {
+       struct list_head list;
+       struct nfc_dev *dev;
+
+       struct mutex sdp_lock;
+       struct mutex socket_lock;
+
+       struct timer_list link_timer;
+       struct sk_buff_head tx_queue;
+       struct workqueue_struct *tx_wq;
+       struct work_struct       tx_work;
+       struct workqueue_struct *rx_wq;
+       struct work_struct       rx_work;
+       struct sk_buff *rx_pending;
+       struct workqueue_struct *timeout_wq;
+       struct work_struct       timeout_work;
+
+       u32 target_idx;
+       u8 rf_mode;
+       u8 comm_mode;
+       unsigned long local_wks;      /* Well known services */
+       unsigned long local_sdp;      /* Local services  */
+       unsigned long local_sap; /* Local SAPs, not available for discovery */
+
+       /* local */
+       u8 gb[NFC_MAX_GT_LEN];
+       u8 gb_len;
+
+       /* remote */
+       u8 remote_gb[NFC_MAX_GT_LEN];
+       u8 remote_gb_len;
+
+       u8  remote_version;
+       u16 remote_miu;
+       u16 remote_lto;
+       u8  remote_opt;
+       u16 remote_wks;
+       u8  remote_rw;
+
+       /* sockets array */
+       struct nfc_llcp_sock *sockets[LLCP_MAX_SAP];
+};
+
+struct nfc_llcp_sock {
+       struct sock sk;
+       struct list_head list;
+       struct nfc_dev *dev;
+       struct nfc_llcp_local *local;
+       u32 target_idx;
+       u32 nfc_protocol;
+
+       u8 ssap;
+       u8 dsap;
+       char *service_name;
+       size_t service_name_len;
+
+       /* Link variables */
+       u8 send_n;
+       u8 send_ack_n;
+       u8 recv_n;
+       u8 recv_ack_n;
+
+       /* Is the remote peer ready to receive */
+       u8 remote_ready;
+
+       struct sk_buff_head tx_queue;
+       struct sk_buff_head tx_pending_queue;
+       struct sk_buff_head tx_backlog_queue;
+
+       struct list_head accept_queue;
+       struct sock *parent;
+};
+
+#define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))
+#define nfc_llcp_dev(sk)  (nfc_llcp_sock((sk))->dev)
+
+#define LLCP_HEADER_SIZE   2
+#define LLCP_SEQUENCE_SIZE 1
+
+/* LLCP versions: 1.1 is 1.0 plus SDP */
+#define LLCP_VERSION_10 0x10
+#define LLCP_VERSION_11 0x11
+
+/* LLCP PDU types */
+#define LLCP_PDU_SYMM     0x0
+#define LLCP_PDU_PAX      0x1
+#define LLCP_PDU_AGF      0x2
+#define LLCP_PDU_UI       0x3
+#define LLCP_PDU_CONNECT  0x4
+#define LLCP_PDU_DISC     0x5
+#define LLCP_PDU_CC       0x6
+#define LLCP_PDU_DM       0x7
+#define LLCP_PDU_FRMR     0x8
+#define LLCP_PDU_SNL      0x9
+#define LLCP_PDU_I        0xc
+#define LLCP_PDU_RR       0xd
+#define LLCP_PDU_RNR      0xe
+
+/* Parameters TLV types */
+#define LLCP_TLV_VERSION 0x1
+#define LLCP_TLV_MIUX    0x2
+#define LLCP_TLV_WKS     0x3
+#define LLCP_TLV_LTO     0x4
+#define LLCP_TLV_RW      0x5
+#define LLCP_TLV_SN      0x6
+#define LLCP_TLV_OPT     0x7
+#define LLCP_TLV_SDREQ   0x8
+#define LLCP_TLV_SDRES   0x9
+#define LLCP_TLV_MAX     0xa
+
+/* Well known LLCP SAP */
+#define LLCP_SAP_SDP   0x1
+#define LLCP_SAP_IP    0x2
+#define LLCP_SAP_OBEX  0x3
+#define LLCP_SAP_SNEP  0x4
+#define LLCP_SAP_MAX   0xff
+
+/* Disconnection reason code */
+#define LLCP_DM_DISC    0x00
+#define LLCP_DM_NOCONN  0x01
+#define LLCP_DM_NOBOUND 0x02
+#define LLCP_DM_REJ     0x03
+
+
+struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
+u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
+                               struct nfc_llcp_sock *sock);
+u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);
+void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap);
+
+/* Sock API */
+struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
+void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
+void nfc_llcp_accept_unlink(struct sock *sk);
+void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
+struct sock *nfc_llcp_accept_dequeue(struct sock *sk, struct socket *newsock);
+
+/* TLV API */
+int nfc_llcp_parse_tlv(struct nfc_llcp_local *local,
+                       u8 *tlv_array, u16 tlv_array_len);
+
+/* Commands API */
+void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
+u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length);
+void nfc_llcp_recv(void *data, struct sk_buff *skb, int err);
+int nfc_llcp_disconnect(struct nfc_llcp_sock *sock);
+int nfc_llcp_send_symm(struct nfc_dev *dev);
+int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
+int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
+int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
+int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
+
+/* Socket API */
+int __init nfc_llcp_sock_init(void);
+void nfc_llcp_sock_exit(void);
diff --git a/net/nfc/llcp/sock.c b/net/nfc/llcp/sock.c
new file mode 100644 (file)
index 0000000..f738ccd
--- /dev/null
@@ -0,0 +1,675 @@
+/*
+ * 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/module.h>
+#include <linux/nfc.h>
+
+#include "../nfc.h"
+#include "llcp.h"
+
+static struct proto llcp_sock_proto = {
+       .name     = "NFC_LLCP",
+       .owner    = THIS_MODULE,
+       .obj_size = sizeof(struct nfc_llcp_sock),
+};
+
+static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
+{
+       struct sock *sk = sock->sk;
+       struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+       struct nfc_llcp_local *local;
+       struct nfc_dev *dev;
+       struct sockaddr_nfc_llcp llcp_addr;
+       int len, ret = 0;
+
+       pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
+
+       if (!addr || addr->sa_family != AF_NFC)
+               return -EINVAL;
+
+       memset(&llcp_addr, 0, sizeof(llcp_addr));
+       len = min_t(unsigned int, sizeof(llcp_addr), alen);
+       memcpy(&llcp_addr, addr, len);
+
+       /* This is going to be a listening socket, dsap must be 0 */
+       if (llcp_addr.dsap != 0)
+               return -EINVAL;
+
+       lock_sock(sk);
+
+       if (sk->sk_state != LLCP_CLOSED) {
+               ret = -EBADFD;
+               goto error;
+       }
+
+       dev = nfc_get_device(llcp_addr.dev_idx);
+       if (dev == NULL) {
+               ret = -ENODEV;
+               goto error;
+       }
+
+       local = nfc_llcp_find_local(dev);
+       if (local == NULL) {
+               ret = -ENODEV;
+               goto put_dev;
+       }
+
+       llcp_sock->dev = dev;
+       llcp_sock->local = local;
+       llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
+       llcp_sock->service_name_len = min_t(unsigned int,
+                       llcp_addr.service_name_len, NFC_LLCP_MAX_SERVICE_NAME);
+       llcp_sock->service_name = kmemdup(llcp_addr.service_name,
+                               llcp_sock->service_name_len, GFP_KERNEL);
+
+       llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
+       if (llcp_sock->ssap == LLCP_MAX_SAP)
+               goto put_dev;
+
+       local->sockets[llcp_sock->ssap] = llcp_sock;
+
+       pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
+
+       sk->sk_state = LLCP_BOUND;
+
+put_dev:
+       nfc_put_device(dev);
+
+error:
+       release_sock(sk);
+       return ret;
+}
+
+static int llcp_sock_listen(struct socket *sock, int backlog)
+{
+       struct sock *sk = sock->sk;
+       int ret = 0;
+
+       pr_debug("sk %p backlog %d\n", sk, backlog);
+
+       lock_sock(sk);
+
+       if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
+                       || sk->sk_state != LLCP_BOUND) {
+               ret = -EBADFD;
+               goto error;
+       }
+
+       sk->sk_max_ack_backlog = backlog;
+       sk->sk_ack_backlog = 0;
+
+       pr_debug("Socket listening\n");
+       sk->sk_state = LLCP_LISTEN;
+
+error:
+       release_sock(sk);
+
+       return ret;
+}
+
+void nfc_llcp_accept_unlink(struct sock *sk)
+{
+       struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+
+       pr_debug("state %d\n", sk->sk_state);
+
+       list_del_init(&llcp_sock->accept_queue);
+       sk_acceptq_removed(llcp_sock->parent);
+       llcp_sock->parent = NULL;
+
+       sock_put(sk);
+}
+
+void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
+{
+       struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+       struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
+
+       /* Lock will be free from unlink */
+       sock_hold(sk);
+
+       list_add_tail(&llcp_sock->accept_queue,
+                       &llcp_sock_parent->accept_queue);
+       llcp_sock->parent = parent;
+       sk_acceptq_added(parent);
+}
+
+struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
+                                       struct socket *newsock)
+{
+       struct nfc_llcp_sock *lsk, *n, *llcp_parent;
+       struct sock *sk;
+
+       llcp_parent = nfc_llcp_sock(parent);
+
+       list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
+                                                       accept_queue) {
+               sk = &lsk->sk;
+               lock_sock(sk);
+
+               if (sk->sk_state == LLCP_CLOSED) {
+                       release_sock(sk);
+                       nfc_llcp_accept_unlink(sk);
+                       continue;
+               }
+
+               if (sk->sk_state == LLCP_CONNECTED || !newsock) {
+                       nfc_llcp_accept_unlink(sk);
+                       if (newsock)
+                               sock_graft(sk, newsock);
+
+                       release_sock(sk);
+
+                       pr_debug("Returning sk state %d\n", sk->sk_state);
+
+                       return sk;
+               }
+
+               release_sock(sk);
+       }
+
+       return NULL;
+}
+
+static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
+                                                               int flags)
+{
+       DECLARE_WAITQUEUE(wait, current);
+       struct sock *sk = sock->sk, *new_sk;
+       long timeo;
+       int ret = 0;
+
+       pr_debug("parent %p\n", sk);
+
+       lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
+
+       if (sk->sk_state != LLCP_LISTEN) {
+               ret = -EBADFD;
+               goto error;
+       }
+
+       timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+
+       /* Wait for an incoming connection. */
+       add_wait_queue_exclusive(sk_sleep(sk), &wait);
+       while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
+               set_current_state(TASK_INTERRUPTIBLE);
+
+               if (!timeo) {
+                       ret = -EAGAIN;
+                       break;
+               }
+
+               if (signal_pending(current)) {
+                       ret = sock_intr_errno(timeo);
+                       break;
+               }
+
+               release_sock(sk);
+               timeo = schedule_timeout(timeo);
+               lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
+       }
+       __set_current_state(TASK_RUNNING);
+       remove_wait_queue(sk_sleep(sk), &wait);
+
+       if (ret)
+               goto error;
+
+       newsock->state = SS_CONNECTED;
+
+       pr_debug("new socket %p\n", new_sk);
+
+error:
+       release_sock(sk);
+
+       return ret;
+}
+
+static int llcp_sock_getname(struct socket *sock, struct sockaddr *addr,
+                            int *len, int peer)
+{
+       struct sockaddr_nfc_llcp *llcp_addr = (struct sockaddr_nfc_llcp *) addr;
+       struct sock *sk = sock->sk;
+       struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+
+       pr_debug("%p\n", sk);
+
+       addr->sa_family = AF_NFC;
+       *len = sizeof(struct sockaddr_nfc_llcp);
+
+       llcp_addr->dev_idx = llcp_sock->dev->idx;
+       llcp_addr->dsap = llcp_sock->dsap;
+       llcp_addr->ssap = llcp_sock->ssap;
+       llcp_addr->service_name_len = llcp_sock->service_name_len;
+       memcpy(llcp_addr->service_name, llcp_sock->service_name,
+                                       llcp_addr->service_name_len);
+
+       return 0;
+}
+
+static inline unsigned int llcp_accept_poll(struct sock *parent)
+{
+       struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
+       struct sock *sk;
+
+       parent_sock = nfc_llcp_sock(parent);
+
+       list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
+                                                               accept_queue) {
+               sk = &llcp_sock->sk;
+
+               if (sk->sk_state == LLCP_CONNECTED)
+                       return POLLIN | POLLRDNORM;
+       }
+
+       return 0;
+}
+
+static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
+                                                       poll_table *wait)
+{
+       struct sock *sk = sock->sk;
+       unsigned int mask = 0;
+
+       pr_debug("%p\n", sk);
+
+       sock_poll_wait(file, sk_sleep(sk), wait);
+
+       if (sk->sk_state == LLCP_LISTEN)
+               return llcp_accept_poll(sk);
+
+       if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
+               mask |= POLLERR;
+
+       if (!skb_queue_empty(&sk->sk_receive_queue))
+               mask |= POLLIN;
+
+       if (sk->sk_state == LLCP_CLOSED)
+               mask |= POLLHUP;
+
+       return mask;
+}
+
+static int llcp_sock_release(struct socket *sock)
+{
+       struct sock *sk = sock->sk;
+       struct nfc_llcp_local *local;
+       struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+
+       if (!sk)
+               return 0;
+
+       pr_debug("%p\n", sk);
+
+       local = llcp_sock->local;
+       if (local == NULL)
+               return -ENODEV;
+
+       mutex_lock(&local->socket_lock);
+
+       if (llcp_sock == local->sockets[llcp_sock->ssap]) {
+               local->sockets[llcp_sock->ssap] = NULL;
+       } else {
+               struct nfc_llcp_sock *parent, *s, *n;
+
+               parent = local->sockets[llcp_sock->ssap];
+
+               list_for_each_entry_safe(s, n, &parent->list, list)
+                       if (llcp_sock == s) {
+                               list_del(&s->list);
+                               break;
+                       }
+
+       }
+
+       mutex_unlock(&local->socket_lock);
+
+       lock_sock(sk);
+
+       /* Send a DISC */
+       if (sk->sk_state == LLCP_CONNECTED)
+               nfc_llcp_disconnect(llcp_sock);
+
+       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;
+                       lock_sock(accept_sk);
+
+                       nfc_llcp_disconnect(lsk);
+                       nfc_llcp_accept_unlink(accept_sk);
+
+                       release_sock(accept_sk);
+
+                       sock_set_flag(sk, SOCK_DEAD);
+                       sock_orphan(accept_sk);
+                       sock_put(accept_sk);
+               }
+       }
+
+       /* Freeing the SAP */
+       if ((sk->sk_state == LLCP_CONNECTED
+                       && llcp_sock->ssap > LLCP_LOCAL_SAP_OFFSET) ||
+           sk->sk_state == LLCP_BOUND ||
+           sk->sk_state == LLCP_LISTEN)
+               nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
+
+       sock_set_flag(sk, SOCK_DEAD);
+
+       release_sock(sk);
+
+       sock_orphan(sk);
+       sock_put(sk);
+
+       return 0;
+}
+
+static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
+                                                       int len, int flags)
+{
+       struct sock *sk = sock->sk;
+       struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+       struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
+       struct nfc_dev *dev;
+       struct nfc_llcp_local *local;
+       int ret = 0;
+
+       pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
+
+       if (!addr || len < sizeof(struct sockaddr_nfc) ||
+                       addr->sa_family != AF_NFC) {
+               pr_err("Invalid socket\n");
+               return -EINVAL;
+       }
+
+       if (addr->service_name_len == 0 && addr->dsap == 0) {
+               pr_err("Missing service name or dsap\n");
+               return -EINVAL;
+       }
+
+       pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
+                                       addr->target_idx, addr->nfc_protocol);
+
+       lock_sock(sk);
+
+       if (sk->sk_state == LLCP_CONNECTED) {
+               ret = -EISCONN;
+               goto error;
+       }
+
+       dev = nfc_get_device(addr->dev_idx);
+       if (dev == NULL) {
+               ret = -ENODEV;
+               goto error;
+       }
+
+       local = nfc_llcp_find_local(dev);
+       if (local == NULL) {
+               ret = -ENODEV;
+               goto put_dev;
+       }
+
+       device_lock(&dev->dev);
+       if (dev->dep_link_up == false) {
+               ret = -ENOLINK;
+               device_unlock(&dev->dev);
+               goto put_dev;
+       }
+       device_unlock(&dev->dev);
+
+       if (local->rf_mode == NFC_RF_INITIATOR &&
+                       addr->target_idx != local->target_idx) {
+               ret = -ENOLINK;
+               goto put_dev;
+       }
+
+       llcp_sock->dev = dev;
+       llcp_sock->local = local;
+       llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
+       if (llcp_sock->ssap == LLCP_SAP_MAX) {
+               ret = -ENOMEM;
+               goto put_dev;
+       }
+       if (addr->service_name_len == 0)
+               llcp_sock->dsap = addr->dsap;
+       else
+               llcp_sock->dsap = LLCP_SAP_SDP;
+       llcp_sock->nfc_protocol = addr->nfc_protocol;
+       llcp_sock->service_name_len = min_t(unsigned int,
+                       addr->service_name_len, NFC_LLCP_MAX_SERVICE_NAME);
+       llcp_sock->service_name = kmemdup(addr->service_name,
+                                llcp_sock->service_name_len, GFP_KERNEL);
+
+       local->sockets[llcp_sock->ssap] = llcp_sock;
+
+       ret = nfc_llcp_send_connect(llcp_sock);
+       if (ret)
+               goto put_dev;
+
+       sk->sk_state = LLCP_CONNECTED;
+
+       release_sock(sk);
+       return 0;
+
+put_dev:
+       nfc_put_device(dev);
+
+error:
+       release_sock(sk);
+       return ret;
+}
+
+static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
+                            struct msghdr *msg, size_t len, int flags)
+{
+       int noblock = flags & MSG_DONTWAIT;
+       struct sock *sk = sock->sk;
+       unsigned int copied, rlen;
+       struct sk_buff *skb, *cskb;
+       int err = 0;
+
+       pr_debug("%p %zu\n", sk, len);
+
+       lock_sock(sk);
+
+       if (sk->sk_state == LLCP_CLOSED &&
+                       skb_queue_empty(&sk->sk_receive_queue)) {
+               release_sock(sk);
+               return 0;
+       }
+
+       release_sock(sk);
+
+       if (flags & (MSG_OOB))
+               return -EOPNOTSUPP;
+
+       skb = skb_recv_datagram(sk, flags, noblock, &err);
+       if (!skb) {
+               pr_err("Recv datagram failed state %d %d %d",
+                               sk->sk_state, err, sock_error(sk));
+
+               if (sk->sk_shutdown & RCV_SHUTDOWN)
+                       return 0;
+
+               return err;
+       }
+
+       rlen   = skb->len;              /* real length of skb */
+       copied = min_t(unsigned int, rlen, len);
+
+       cskb = skb;
+       if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
+               if (!(flags & MSG_PEEK))
+                       skb_queue_head(&sk->sk_receive_queue, skb);
+               return -EFAULT;
+       }
+
+       /* Mark read part of skb as used */
+       if (!(flags & MSG_PEEK)) {
+
+               /* SOCK_STREAM: re-queue skb if it contains unreceived data */
+               if (sk->sk_type == SOCK_STREAM) {
+                       skb_pull(skb, copied);
+                       if (skb->len) {
+                               skb_queue_head(&sk->sk_receive_queue, skb);
+                               goto done;
+                       }
+               }
+
+               kfree_skb(skb);
+       }
+
+       /* XXX Queue backlogged skbs */
+
+done:
+       /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
+       if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
+               copied = rlen;
+
+       return copied;
+}
+
+static const struct proto_ops llcp_sock_ops = {
+       .family         = PF_NFC,
+       .owner          = THIS_MODULE,
+       .bind           = llcp_sock_bind,
+       .connect        = llcp_sock_connect,
+       .release        = llcp_sock_release,
+       .socketpair     = sock_no_socketpair,
+       .accept         = llcp_sock_accept,
+       .getname        = llcp_sock_getname,
+       .poll           = llcp_sock_poll,
+       .ioctl          = sock_no_ioctl,
+       .listen         = llcp_sock_listen,
+       .shutdown       = sock_no_shutdown,
+       .setsockopt     = sock_no_setsockopt,
+       .getsockopt     = sock_no_getsockopt,
+       .sendmsg        = sock_no_sendmsg,
+       .recvmsg        = llcp_sock_recvmsg,
+       .mmap           = sock_no_mmap,
+};
+
+static void llcp_sock_destruct(struct sock *sk)
+{
+       struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+
+       pr_debug("%p\n", sk);
+
+       if (sk->sk_state == LLCP_CONNECTED)
+               nfc_put_device(llcp_sock->dev);
+
+       skb_queue_purge(&sk->sk_receive_queue);
+
+       nfc_llcp_sock_free(llcp_sock);
+
+       if (!sock_flag(sk, SOCK_DEAD)) {
+               pr_err("Freeing alive NFC LLCP socket %p\n", sk);
+               return;
+       }
+}
+
+struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
+{
+       struct sock *sk;
+       struct nfc_llcp_sock *llcp_sock;
+
+       sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
+       if (!sk)
+               return NULL;
+
+       llcp_sock = nfc_llcp_sock(sk);
+
+       sock_init_data(sock, sk);
+       sk->sk_state = LLCP_CLOSED;
+       sk->sk_protocol = NFC_SOCKPROTO_LLCP;
+       sk->sk_type = type;
+       sk->sk_destruct = llcp_sock_destruct;
+
+       llcp_sock->ssap = 0;
+       llcp_sock->dsap = LLCP_SAP_SDP;
+       llcp_sock->send_n = llcp_sock->send_ack_n = 0;
+       llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
+       llcp_sock->remote_ready = 1;
+       skb_queue_head_init(&llcp_sock->tx_queue);
+       skb_queue_head_init(&llcp_sock->tx_pending_queue);
+       skb_queue_head_init(&llcp_sock->tx_backlog_queue);
+       INIT_LIST_HEAD(&llcp_sock->list);
+       INIT_LIST_HEAD(&llcp_sock->accept_queue);
+
+       if (sock != NULL)
+               sock->state = SS_UNCONNECTED;
+
+       return sk;
+}
+
+void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
+{
+       kfree(sock->service_name);
+
+       skb_queue_purge(&sock->tx_queue);
+       skb_queue_purge(&sock->tx_pending_queue);
+       skb_queue_purge(&sock->tx_backlog_queue);
+
+       list_del_init(&sock->accept_queue);
+
+       sock->parent = NULL;
+}
+
+static int llcp_sock_create(struct net *net, struct socket *sock,
+                               const struct nfc_protocol *nfc_proto)
+{
+       struct sock *sk;
+
+       pr_debug("%p\n", sock);
+
+       if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
+               return -ESOCKTNOSUPPORT;
+
+       sock->ops = &llcp_sock_ops;
+
+       sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
+       if (sk == NULL)
+               return -ENOMEM;
+
+       return 0;
+}
+
+static const struct nfc_protocol llcp_nfc_proto = {
+       .id       = NFC_SOCKPROTO_LLCP,
+       .proto    = &llcp_sock_proto,
+       .owner    = THIS_MODULE,
+       .create   = llcp_sock_create
+};
+
+int __init nfc_llcp_sock_init(void)
+{
+       return nfc_proto_register(&llcp_nfc_proto);
+}
+
+void nfc_llcp_sock_exit(void)
+{
+       nfc_proto_unregister(&llcp_nfc_proto);
+}
index 4d0fb125d03363cb6b10ac328f6c4dbbaf9001b1..2c2c4015c68b61be5121df63e6c9130c302c9275 100644 (file)
@@ -46,6 +46,60 @@ struct nfc_rawsock {
 #define to_rawsock_sk(_tx_work) \
        ((struct sock *) container_of(_tx_work, struct nfc_rawsock, tx_work))
 
+#ifdef CONFIG_NFC_LLCP
+
+void nfc_llcp_mac_is_down(struct nfc_dev *dev);
+void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
+                       u8 comm_mode, u8 rf_mode);
+int nfc_llcp_register_device(struct nfc_dev *dev);
+void nfc_llcp_unregister_device(struct nfc_dev *dev);
+int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len);
+u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, u8 *general_bytes_len);
+int __init nfc_llcp_init(void);
+void nfc_llcp_exit(void);
+
+#else
+
+void nfc_llcp_mac_is_down(struct nfc_dev *dev)
+{
+}
+
+void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
+                       u8 comm_mode, u8 rf_mode)
+{
+}
+
+static inline int nfc_llcp_register_device(struct nfc_dev *dev)
+{
+       return 0;
+}
+
+static inline void nfc_llcp_unregister_device(struct nfc_dev *dev)
+{
+}
+
+static inline int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
+{
+       return 0;
+}
+
+static inline u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, u8 *gb_len)
+{
+       *gb_len = 0;
+       return NULL;
+}
+
+static inline int nfc_llcp_init(void)
+{
+       return 0;
+}
+
+static inline void nfc_llcp_exit(void)
+{
+}
+
+#endif
+
 int __init rawsock_init(void);
 void rawsock_exit(void);