--- /dev/null
- mask |= POLLERR;
+ /*
+ * 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 int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
+ {
+ DECLARE_WAITQUEUE(wait, current);
+ int err = 0;
+
+ pr_debug("sk %p", sk);
+
+ add_wait_queue(sk_sleep(sk), &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ while (sk->sk_state != state) {
+ if (!timeo) {
+ err = -EINPROGRESS;
+ break;
+ }
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ break;
+ }
+
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock(sk);
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ err = sock_error(sk);
+ if (err)
+ break;
+ }
+
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(sk_sleep(sk), &wait);
+ return err;
+ }
+
+ 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;
+
+ if (!addr || addr->sa_family != AF_NFC)
+ return -EINVAL;
+
+ pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
+
+ 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 = nfc_llcp_local_get(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_SAP_MAX) {
+ ret = -EADDRINUSE;
+ goto put_dev;
+ }
+
+ llcp_sock->reserved_ssap = llcp_sock->ssap;
+
+ nfc_llcp_sock_link(&local->sockets, sk);
+
+ 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_raw_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;
+
+ if (!addr || addr->sa_family != AF_NFC)
+ return -EINVAL;
+
+ pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
+
+ memset(&llcp_addr, 0, sizeof(llcp_addr));
+ len = min_t(unsigned int, sizeof(llcp_addr), alen);
+ memcpy(&llcp_addr, addr, len);
+
+ 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 = nfc_llcp_local_get(local);
+ llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
+
+ nfc_llcp_sock_link(&local->raw_sockets, sk);
+
+ 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;
+ }
+
+ static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, unsigned int optlen)
+ {
+ struct sock *sk = sock->sk;
+ struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+ u32 opt;
+ int err = 0;
+
+ pr_debug("%p optname %d\n", sk, optname);
+
+ if (level != SOL_NFC)
+ return -ENOPROTOOPT;
+
+ lock_sock(sk);
+
+ switch (optname) {
+ case NFC_LLCP_RW:
+ if (sk->sk_state == LLCP_CONNECTED ||
+ sk->sk_state == LLCP_BOUND ||
+ sk->sk_state == LLCP_LISTEN) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (get_user(opt, (u32 __user *) optval)) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (opt > LLCP_MAX_RW) {
+ err = -EINVAL;
+ break;
+ }
+
+ llcp_sock->rw = (u8) opt;
+
+ break;
+
+ case NFC_LLCP_MIUX:
+ if (sk->sk_state == LLCP_CONNECTED ||
+ sk->sk_state == LLCP_BOUND ||
+ sk->sk_state == LLCP_LISTEN) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (get_user(opt, (u32 __user *) optval)) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (opt > LLCP_MAX_MIUX) {
+ err = -EINVAL;
+ break;
+ }
+
+ llcp_sock->miux = cpu_to_be16((u16) opt);
+
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+
+ pr_debug("%p rw %d miux %d\n", llcp_sock,
+ llcp_sock->rw, llcp_sock->miux);
+
+ return err;
+ }
+
+ static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+ {
+ struct nfc_llcp_local *local;
+ struct sock *sk = sock->sk;
+ struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+ int len, err = 0;
+ u16 miux, remote_miu;
+ u8 rw;
+
+ pr_debug("%p optname %d\n", sk, optname);
+
+ if (level != SOL_NFC)
+ return -ENOPROTOOPT;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ local = llcp_sock->local;
+ if (!local)
+ return -ENODEV;
+
+ len = min_t(u32, len, sizeof(u32));
+
+ lock_sock(sk);
+
+ switch (optname) {
+ case NFC_LLCP_RW:
+ rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
+ if (put_user(rw, (u32 __user *) optval))
+ err = -EFAULT;
+
+ break;
+
+ case NFC_LLCP_MIUX:
+ miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
+ be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
+
+ if (put_user(miux, (u32 __user *) optval))
+ err = -EFAULT;
+
+ break;
+
+ case NFC_LLCP_REMOTE_MIU:
+ remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
+ local->remote_miu : llcp_sock->remote_miu;
+
+ if (put_user(remote_miu, (u32 __user *) optval))
+ err = -EFAULT;
+
+ break;
+
+ case NFC_LLCP_REMOTE_LTO:
+ if (put_user(local->remote_lto / 10, (u32 __user *) optval))
+ err = -EFAULT;
+
+ break;
+
+ case NFC_LLCP_REMOTE_RW:
+ if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
+ err = -EFAULT;
+
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+
+ return err;
+ }
+
+ 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) {
+ list_del_init(&lsk->accept_queue);
+ sock_put(sk);
+
+ if (newsock)
+ sock_graft(sk, newsock);
+
+ release_sock(sk);
+
+ pr_debug("Returning sk state %d\n", sk->sk_state);
+
+ sk_acceptq_removed(parent);
+
+ 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 *uaddr,
+ int *len, int peer)
+ {
+ struct sock *sk = sock->sk;
+ struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+ DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
+
+ if (llcp_sock == NULL || llcp_sock->dev == NULL)
+ return -EBADFD;
+
+ pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
+ llcp_sock->dsap, llcp_sock->ssap);
+
+ uaddr->sa_family = AF_NFC;
+
+ *len = sizeof(struct sockaddr_nfc_llcp);
+
+ llcp_addr->dev_idx = llcp_sock->dev->idx;
+ llcp_addr->target_idx = llcp_sock->target_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 |
++ (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
+
+ if (!skb_queue_empty(&sk->sk_receive_queue))
+ mask |= POLLIN | POLLRDNORM;
+
+ if (sk->sk_state == LLCP_CLOSED)
+ mask |= POLLHUP;
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ mask |= POLLRDHUP | POLLIN | POLLRDNORM;
+
+ if (sk->sk_shutdown == SHUTDOWN_MASK)
+ mask |= POLLHUP;
+
+ if (sock_writeable(sk))
+ mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
+ else
+ set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+
+ pr_debug("mask 0x%x\n", mask);
+
+ 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);
+ int err = 0;
+
+ if (!sk)
+ return 0;
+
+ pr_debug("%p\n", sk);
+
+ local = llcp_sock->local;
+ if (local == NULL) {
+ err = -ENODEV;
+ goto out;
+ }
+
+ 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);
+ }
+ }
+
+ if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
+ nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
+
+ release_sock(sk);
+
+ if (sock->type == SOCK_RAW)
+ nfc_llcp_sock_unlink(&local->raw_sockets, sk);
+ else
+ nfc_llcp_sock_unlink(&local->sockets, sk);
+
+ out:
+ sock_orphan(sk);
+ sock_put(sk);
+
+ return err;
+ }
+
+ 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)
+ return -EINVAL;
+
+ if (addr->service_name_len == 0 && addr->dsap == 0)
+ 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 = nfc_llcp_local_get(local);
+ llcp_sock->remote_miu = llcp_sock->local->remote_miu;
+ llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
+ if (llcp_sock->ssap == LLCP_SAP_MAX) {
+ ret = -ENOMEM;
+ goto put_dev;
+ }
+
+ llcp_sock->reserved_ssap = llcp_sock->ssap;
+
+ 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);
+
+ nfc_llcp_sock_link(&local->connecting_sockets, sk);
+
+ ret = nfc_llcp_send_connect(llcp_sock);
+ if (ret)
+ goto sock_unlink;
+
+ ret = sock_wait_state(sk, LLCP_CONNECTED,
+ sock_sndtimeo(sk, flags & O_NONBLOCK));
+ if (ret)
+ goto sock_unlink;
+
+ release_sock(sk);
+
+ return 0;
+
+ sock_unlink:
+ nfc_llcp_put_ssap(local, llcp_sock->ssap);
+
+ nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
+
+ put_dev:
+ nfc_put_device(dev);
+
+ error:
+ release_sock(sk);
+ return ret;
+ }
+
+ static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len)
+ {
+ struct sock *sk = sock->sk;
+ struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
+ int ret;
+
+ pr_debug("sock %p sk %p", sock, sk);
+
+ ret = sock_error(sk);
+ if (ret)
+ return ret;
+
+ if (msg->msg_flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ lock_sock(sk);
+
+ if (sk->sk_type == SOCK_DGRAM) {
+ struct sockaddr_nfc_llcp *addr =
+ (struct sockaddr_nfc_llcp *)msg->msg_name;
+
+ if (msg->msg_namelen < sizeof(*addr)) {
+ release_sock(sk);
+ return -EINVAL;
+ }
+
+ release_sock(sk);
+
+ return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
+ msg, len);
+ }
+
+ if (sk->sk_state != LLCP_CONNECTED) {
+ release_sock(sk);
+ return -ENOTCONN;
+ }
+
+ release_sock(sk);
+
+ return nfc_llcp_send_i_frame(llcp_sock, msg, len);
+ }
+
+ 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);
+
++ msg->msg_namelen = 0;
++
+ 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 (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
+ if (!(flags & MSG_PEEK))
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ return -EFAULT;
+ }
+
+ sock_recv_timestamp(msg, sk, skb);
+
+ if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
+ struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
+ struct sockaddr_nfc_llcp *sockaddr =
+ (struct sockaddr_nfc_llcp *) msg->msg_name;
+
+ msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
+
+ pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
+
++ memset(sockaddr, 0, sizeof(*sockaddr));
+ sockaddr->sa_family = AF_NFC;
+ sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
+ sockaddr->dsap = ui_cb->dsap;
+ sockaddr->ssap = ui_cb->ssap;
+ }
+
+ /* 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 ||
+ sk->sk_type == SOCK_DGRAM ||
+ sk->sk_type == SOCK_RAW) {
+ 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 = nfc_llcp_setsockopt,
+ .getsockopt = nfc_llcp_getsockopt,
+ .sendmsg = llcp_sock_sendmsg,
+ .recvmsg = llcp_sock_recvmsg,
+ .mmap = sock_no_mmap,
+ };
+
+ static const struct proto_ops llcp_rawsock_ops = {
+ .family = PF_NFC,
+ .owner = THIS_MODULE,
+ .bind = llcp_raw_sock_bind,
+ .connect = sock_no_connect,
+ .release = llcp_sock_release,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = llcp_sock_getname,
+ .poll = llcp_sock_poll,
+ .ioctl = sock_no_ioctl,
+ .listen = sock_no_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->rw = LLCP_MAX_RW + 1;
+ llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
+ 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;
+ llcp_sock->reserved_ssap = LLCP_SAP_MAX;
+ nfc_llcp_socket_remote_param_init(llcp_sock);
+ skb_queue_head_init(&llcp_sock->tx_queue);
+ skb_queue_head_init(&llcp_sock->tx_pending_queue);
+ 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);
+
+ list_del_init(&sock->accept_queue);
+
+ sock->parent = NULL;
+
+ nfc_llcp_local_put(sock->local);
+ }
+
+ 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 &&
+ sock->type != SOCK_RAW)
+ return -ESOCKTNOSUPPORT;
+
+ if (sock->type == SOCK_RAW)
+ sock->ops = &llcp_rawsock_ops;
+ else
+ 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);
+ }
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff