static int rawsock_create(struct net *net, struct socket *sock, const struct nfc_protocol *nfc_proto) { struct sock *sk; nfc_dbg("sock=%p", sock); if (sock->type != SOCK_SEQPACKET) return -ESOCKTNOSUPPORT; sock->ops = &rawsock_ops; sk = sk_alloc(net, PF_NFC, GFP_KERNEL, nfc_proto->proto); if (!sk) return -ENOMEM; sock_init_data(sock, sk); sk->sk_protocol = nfc_proto->id; sk->sk_destruct = rawsock_destruct; sock->state = SS_UNCONNECTED; INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work); nfc_rawsock(sk)->tx_work_scheduled = false; return 0; }
static void rawsock_tx_work(struct work_struct *work) { struct sock *sk = to_rawsock_sk(work); struct nfc_dev *dev = nfc_rawsock(sk)->dev; u32 target_idx = nfc_rawsock(sk)->target_idx; struct sk_buff *skb; int rc; nfc_dbg("sk=%p target_idx=%u", sk, target_idx); if (sk->sk_shutdown & SEND_SHUTDOWN) { rawsock_write_queue_purge(sk); return; } skb = skb_dequeue(&sk->sk_write_queue); sock_hold(sk); rc = nfc_data_exchange(dev, target_idx, skb, rawsock_data_exchange_complete, sk); if (rc) { rawsock_report_error(sk, rc); sock_put(sk); } }
static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, int err) { struct sock *sk = (struct sock *) context; BUG_ON(in_irq()); nfc_dbg("sk=%p err=%d", sk, err); if (err) goto error; err = rawsock_add_header(skb); if (err) goto error; err = sock_queue_rcv_skb(sk, skb); if (err) goto error; spin_lock_bh(&sk->sk_write_queue.lock); if (!skb_queue_empty(&sk->sk_write_queue)) schedule_work(&nfc_rawsock(sk)->tx_work); else nfc_rawsock(sk)->tx_work_scheduled = false; spin_unlock_bh(&sk->sk_write_queue.lock); sock_put(sk); return; error: rawsock_report_error(sk, err); sock_put(sk); }
static int rawsock_connect(struct socket *sock, struct sockaddr *_addr, int len, int flags) { struct sock *sk = sock->sk; struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr; struct nfc_dev *dev; int rc = 0; pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags); if (!addr || len < sizeof(struct sockaddr_nfc) || addr->sa_family != AF_NFC) 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 (sock->state == SS_CONNECTED) { rc = -EISCONN; goto error; } dev = nfc_get_device(addr->dev_idx); if (!dev) { rc = -ENODEV; goto error; } if (addr->target_idx > dev->target_next_idx - 1 || addr->target_idx < dev->target_next_idx - dev->n_targets) { rc = -EINVAL; goto error; } rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol); if (rc) goto put_dev; nfc_rawsock(sk)->dev = dev; nfc_rawsock(sk)->target_idx = addr->target_idx; sock->state = SS_CONNECTED; sk->sk_state = TCP_ESTABLISHED; sk->sk_state_change(sk); release_sock(sk); return 0; put_dev: nfc_put_device(dev); error: release_sock(sk); return rc; }
static void rawsock_destruct(struct sock *sk) { nfc_dbg("sk=%p", sk); if (sk->sk_state == TCP_ESTABLISHED) { nfc_deactivate_target(nfc_rawsock(sk)->dev, nfc_rawsock(sk)->target_idx); nfc_put_device(nfc_rawsock(sk)->dev); } skb_queue_purge(&sk->sk_receive_queue); if (!sock_flag(sk, SOCK_DEAD)) { nfc_err("Freeing alive NFC raw socket %p", sk); return; } }
static void rawsock_write_queue_purge(struct sock *sk) { nfc_dbg("sk=%p", sk); spin_lock_bh(&sk->sk_write_queue.lock); __skb_queue_purge(&sk->sk_write_queue); nfc_rawsock(sk)->tx_work_scheduled = false; spin_unlock_bh(&sk->sk_write_queue.lock); }
static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) { struct sock *sk = sock->sk; struct nfc_dev *dev = nfc_rawsock(sk)->dev; struct sk_buff *skb; int rc; nfc_dbg("sock=%p sk=%p len=%zu", sock, sk, len); if (msg->msg_namelen) return -EOPNOTSUPP; if (sock->state != SS_CONNECTED) return -ENOTCONN; skb = sock_alloc_send_skb(sk, len + dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE, msg->msg_flags & MSG_DONTWAIT, &rc); if (!skb) return rc; skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); if (rc < 0) { kfree_skb(skb); return rc; } spin_lock_bh(&sk->sk_write_queue.lock); __skb_queue_tail(&sk->sk_write_queue, skb); if (!nfc_rawsock(sk)->tx_work_scheduled) { schedule_work(&nfc_rawsock(sk)->tx_work); nfc_rawsock(sk)->tx_work_scheduled = true; } spin_unlock_bh(&sk->sk_write_queue.lock); return len; }
static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) { struct sock *sk = sock->sk; struct nfc_dev *dev = nfc_rawsock(sk)->dev; struct sk_buff *skb; int rc; pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len); if (msg->msg_namelen) return -EOPNOTSUPP; if (sock->state != SS_CONNECTED) return -ENOTCONN; skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc); if (skb == NULL) return rc; rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); if (rc < 0) { kfree_skb(skb); return rc; } spin_lock_bh(&sk->sk_write_queue.lock); __skb_queue_tail(&sk->sk_write_queue, skb); if (!nfc_rawsock(sk)->tx_work_scheduled) { schedule_work(&nfc_rawsock(sk)->tx_work); nfc_rawsock(sk)->tx_work_scheduled = true; } spin_unlock_bh(&sk->sk_write_queue.lock); return len; }