/**************************************************************************** * net/socket/bluetooth_recvfrom.c * * Copyright (C) 2018 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "netdev/netdev.h" #include "devif/devif.h" #include "socket/socket.h" #include "bluetooth/bluetooth.h" #ifdef CONFIG_NET_BLUETOOTH /**************************************************************************** * Private Types ****************************************************************************/ struct bluetooth_recvfrom_s { FAR struct socket *ir_sock; /* Points to the parent socket structure */ FAR struct devif_callback_s *ir_cb; /* Reference to callback instance */ FAR struct sockaddr *ir_from; /* Location to return the from address */ FAR uint8_t *ir_buffer; /* Pointer to receive buffer */ size_t ir_buflen; /* Length of receive buffer */ sem_t ir_sem; /* Semaphore signals recv completion */ ssize_t ir_result; /* Success:size, failure:negated errno */ }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: bluetooth_count_frames * * Description: * Return the number of frames in the RX queue. * * Input Parameters: * conn - The socket connection structure. * * Returned Value: * The number of frames in the queue. * ****************************************************************************/ #if defined(CONFIG_DEBUG_ASSERTIONS) && CONFIG_NET_BLUETOOTH_BACKLOG > 0 static int bluetooth_count_frames(FAR struct bluetooth_conn_s *conn) { FAR struct bluetooth_container_s *container; int count; for (count = 0, container = conn->bc_rxhead; container != NULL; count++, container = container->bn_flink) { } return count; } #endif /**************************************************************************** * Name: bluetooth_recvfrom_sender * * Description: * Perform the reception operation if there are any queued frames in the * RX frame queue. * * Input Parameters: * * Returned Value: * * Assumptions: * The network is lockec * ****************************************************************************/ static ssize_t bluetooth_recvfrom_rxqueue(FAR struct radio_driver_s *radio, FAR struct bluetooth_recvfrom_s *pstate) { FAR struct bluetooth_container_s *container; FAR struct sockaddr_bt_s *iaddr; FAR struct bluetooth_conn_s *conn; FAR struct iob_s *iob; size_t copylen; int ret = -EAGAIN; /* Check if there is anything in in the RX input queue */ DEBUGASSERT(pstate != NULL && pstate->ir_sock != NULL); conn = (FAR struct bluetooth_conn_s *)pstate->ir_sock->s_conn; DEBUGASSERT(conn != NULL); if (conn->bc_rxhead != NULL) { /* Remove the container from the RX input queue. */ container = conn->bc_rxhead; DEBUGASSERT(container != NULL); conn->bc_rxhead = container->bn_flink; container->bn_flink = NULL; /* Did the RX queue become empty? */ if (conn->bc_rxhead == NULL) { conn->bc_rxtail = NULL; } #if CONFIG_NET_BLUETOOTH_BACKLOG > 0 /* Decrement the count of frames in the queue. */ DEBUGASSERT(conn->bc_backlog > 0); conn->bc_backlog--; DEBUGASSERT((int)conn->bc_backlog == bluetooth_count_frames(conn)); #endif /* Extract the IOB containing the frame from the container */ iob = container->bn_iob; container->bn_iob = NULL; DEBUGASSERT(iob != NULL); /* Copy the new packet data into the user buffer */ copylen = iob->io_len - iob->io_offset; memcpy(pstate->ir_buffer, &iob->io_data[iob->io_offset], copylen); ninfo("Received %d bytes\n", (int)copylen); ret = copylen; /* If a 'from' address pointer was supplied, copy the source address * in the container there. */ if (pstate->ir_from != NULL) { iaddr = (FAR struct sockaddr_bt_s *)pstate->ir_from; iaddr->bt_family = AF_BLUETOOTH; BLUETOOTH_ADDRCOPY(&iaddr->bt_bdaddr, &container->bn_raddr); iaddr->bt_channel = container->bn_channel; } /* Free both the IOB and the container */ iob_free(iob, IOBUSER_NET_SOCK_BLUETOOTH); bluetooth_container_free(container); } return ret; } /**************************************************************************** * Name: bluetooth_recvfrom_eventhandler * * Description: * * Input Parameters: * * Returned Value: * * Assumptions: * The network is locked. * ****************************************************************************/ static uint16_t bluetooth_recvfrom_eventhandler(FAR struct net_driver_s *dev, FAR void *pvconn, FAR void *pvpriv, uint16_t flags) { FAR struct bluetooth_recvfrom_s *pstate; FAR struct radio_driver_s *radio; ssize_t ret; ninfo("flags: %04x\n", flags); DEBUGASSERT(pvpriv != NULL && dev != NULL && pvconn != NULL); /* Ignore polls from non Bluetooth network drivers */ if (dev->d_lltype != NET_LL_BLUETOOTH) { return flags; } /* Make sure that this is the driver to which the socket is bound. */ #warning Missing logic pstate = (FAR struct bluetooth_recvfrom_s *)pvpriv; radio = (FAR struct radio_driver_s *)dev; /* 'pstate' might be null in some race conditions (?) */ if (pstate != NULL) { /* If a new packet is available, then complete the read action. */ if ((flags & BLUETOOTH_NEWDATA) != 0) { /* Attempt to receive the frame */ ret = bluetooth_recvfrom_rxqueue(radio, pstate); if (ret > 0) { /* Don't allow any further call backs. */ pstate->ir_cb->flags = 0; pstate->ir_cb->priv = NULL; pstate->ir_cb->event = NULL; pstate->ir_result = ret; /* indicate that the data has been consumed */ flags &= ~BLUETOOTH_NEWDATA; /* Wake up the waiting thread, returning the number of bytes * actually read. */ nxsem_post(&pstate->ir_sem); } } } return flags; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: bluetooth_recvfrom * * Description: * Implements the socket recvfrom interface for the case of the AF_INET * and AF_INET6 address families. bluetooth_recvfrom() receives messages from * a socket, and may be used to receive data on a socket whether or not it * is connection-oriented. * * If 'from' is not NULL, and the underlying protocol provides the source * address, this source address is filled in. The argument 'fromlen' is * initialized to the size of the buffer associated with from, and * modified on return to indicate the actual size of the address stored * there. * * Input Parameters: * psock A pointer to a NuttX-specific, internal socket structure * buf Buffer to receive data * len Length of buffer * flags Receive flags * from Address of source (may be NULL) * fromlen The length of the address structure * * Returned Value: * On success, returns the number of characters received. If no data is * available to be received and the peer has performed an orderly shutdown, * recv() will return 0. Otherwise, on errors, a negated errno value is * returned (see recvfrom() for the list of appropriate error values). * * Assumptions: * The network is locked. * ****************************************************************************/ ssize_t bluetooth_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len, int flags, FAR struct sockaddr *from, FAR socklen_t *fromlen) { FAR struct bluetooth_conn_s *conn = (FAR struct bluetooth_conn_s *)psock->s_conn; FAR struct radio_driver_s *radio; struct bluetooth_recvfrom_s state; ssize_t ret; /* If a 'from' address has been provided, verify that it is large * enough to hold this address family. */ if (from != NULL && *fromlen < sizeof(struct sockaddr_bt_s)) { return -EINVAL; } if (psock->s_type != SOCK_RAW) { nerr("ERROR: Unsupported socket type: %d\n", psock->s_type); return -EPROTONOSUPPORT; } /* Perform the packet recvfrom() operation */ /* Initialize the state structure. This is done with the network * locked because we don't want anything to happen until we are ready. */ net_lock(); memset(&state, 0, sizeof(struct bluetooth_recvfrom_s)); state.ir_buflen = len; state.ir_buffer = buf; state.ir_sock = psock; state.ir_from = from; /* Get the device driver that will service this transfer */ radio = bluetooth_find_device(conn, &conn->bc_laddr); if (radio == NULL) { ret = -ENODEV; goto errout_with_lock; } /* Before we wait for data, let's check if there are already frame(s) * waiting in the RX queue. */ ret = bluetooth_recvfrom_rxqueue(radio, &state); if (ret > 0) { /* Good newe! We have a frame and we are done. */ net_unlock(); return ret; } /* We will have to wait. This semaphore is used for signaling and, * hence, should not have priority inheritance enabled. */ nxsem_init(&state.ir_sem, 0, 0); /* Doesn't really fail */ nxsem_setprotocol(&state.ir_sem, SEM_PRIO_NONE); /* Set up the callback in the connection */ state.ir_cb = bluetooth_callback_alloc(&radio->r_dev, conn); if (state.ir_cb) { state.ir_cb->flags = (BLUETOOTH_NEWDATA | BLUETOOTH_POLL); state.ir_cb->priv = (FAR void *)&state; state.ir_cb->event = bluetooth_recvfrom_eventhandler; /* Wait for either the receive to complete or for an error/timeout to * occur. NOTES: (1) net_lockedwait will also terminate if a signal * is received, (2) the network is locked! It will be un-locked while * the task sleeps and automatically re-locked when the task restarts. */ net_lockedwait(&state.ir_sem); /* Make sure that no further events are processed */ bluetooth_callback_free(&radio->r_dev, conn, state.ir_cb); ret = state.ir_result; } else { ret = -EBUSY; } nxsem_destroy(&state.ir_sem); errout_with_lock: net_unlock(); return ret; } #endif /* CONFIG_NET_BLUETOOTH */