/**************************************************************************** * net/icmp/icmp_netpoll.c * * Copyright (C) 2017-2019 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 "devif/devif.h" #include "netdev/netdev.h" #include "icmp/icmp.h" /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: icmp_poll_eventhandler * * Description: * This function is called to perform the actual UDP receive operation * via the device interface layer. * * Input Parameters: * dev The structure of the network driver that caused the event * conn The connection structure associated with the socket * flags Set of events describing why the callback was invoked * * Returned Value: * None * * Assumptions: * This function must be called with the network locked. * ****************************************************************************/ static uint16_t icmp_poll_eventhandler(FAR struct net_driver_s *dev, FAR void *pvconn, FAR void *pvpriv, uint16_t flags) { FAR struct icmp_poll_s *info = (FAR struct icmp_poll_s *)pvpriv; FAR struct icmp_conn_s *conn; FAR struct socket *psock; pollevent_t eventset; ninfo("flags: %04x\n", flags); DEBUGASSERT(info == NULL || info->fds != NULL); /* 'priv' might be null in some race conditions (?). Only process the * the event if this poll is from the same device that the request was * sent out on. */ if (info != NULL) { /* Is this a response on the same device that we sent the request out * on? */ psock = info->psock; DEBUGASSERT(psock != NULL && psock->s_conn != NULL); conn = psock->s_conn; if (dev != conn->dev) { ninfo("Wrong device\n"); return flags; } /* Check for data or connection availability events. */ eventset = 0; if ((flags & ICMP_NEWDATA) != 0) { eventset |= (POLLIN & info->fds->events); } /* Check for loss of connection events. */ if ((flags & NETDEV_DOWN) != 0) { eventset |= (POLLHUP | POLLERR); } /* Awaken the caller of poll() is requested event occurred. */ if (eventset) { info->fds->revents |= eventset; nxsem_post(info->fds->sem); } } return flags; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: icmp_pollsetup * * Description: * Setup to monitor events on one ICMP socket * * Input Parameters: * psock - The IPPROTO_ICMP socket of interest * fds - The structure describing the events to be monitored, OR NULL if * this is a request to stop monitoring events. * * Returned Value: * 0: Success; Negated errno on failure * ****************************************************************************/ int icmp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds) { FAR struct icmp_conn_s *conn = psock->s_conn; FAR struct icmp_poll_s *info; FAR struct devif_callback_s *cb; int ret = OK; DEBUGASSERT(conn != NULL && fds != NULL); /* Some of the following must be atomic */ net_lock(); /* Find a container to hold the poll information */ info = conn->pollinfo; while (info->psock != NULL) { if (++info >= &conn->pollinfo[CONFIG_NET_ICMP_NPOLLWAITERS]) { ret = -ENOMEM; goto errout_with_lock; } } /* Allocate a ICMP callback structure */ cb = icmp_callback_alloc(conn->dev, conn); if (cb == NULL) { ret = -EBUSY; goto errout_with_lock; } /* Initialize the poll info container */ info->psock = psock; info->fds = fds; info->cb = cb; /* Initialize the callback structure. Save the reference to the info * structure as callback private data so that it will be available during * callback processing. */ cb->flags = NETDEV_DOWN; cb->priv = (FAR void *)info; cb->event = icmp_poll_eventhandler; if ((fds->events & POLLIN) != 0) { cb->flags |= ICMP_NEWDATA; } /* Save the reference in the poll info structure as fds private as well * for use during poll teardown as well. */ fds->priv = (FAR void *)info; /* Check for read data availability now */ if (!IOB_QEMPTY(&conn->readahead)) { /* Normal data may be read without blocking. */ fds->revents |= (POLLRDNORM & fds->events); } /* Always report POLLWRNORM if caller request it because we don't utilize * IOB buffer for sending. */ fds->revents |= (POLLWRNORM & fds->events); /* Check if any requested events are already in effect */ if (fds->revents != 0) { /* Yes.. then signal the poll logic */ nxsem_post(fds->sem); } errout_with_lock: net_unlock(); return ret; } /**************************************************************************** * Name: icmp_pollteardown * * Description: * Teardown monitoring of events on an ICMP socket * * Input Parameters: * psock - The IPPROTO_ICMP socket of interest * fds - The structure describing the events to be monitored, OR NULL if * this is a request to stop monitoring events. * * Returned Value: * 0: Success; Negated errno on failure * ****************************************************************************/ int icmp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds) { FAR struct icmp_conn_s *conn; FAR struct icmp_poll_s *info; DEBUGASSERT(psock != NULL && psock->s_conn != NULL && fds != NULL && fds->priv != NULL); conn = psock->s_conn; /* Recover the socket descriptor poll state info from the poll structure */ info = (FAR struct icmp_poll_s *)fds->priv; DEBUGASSERT(info != NULL && info->fds != NULL && info->cb != NULL); if (info != NULL) { /* Release the callback */ icmp_callback_free(conn->dev, conn, info->cb); /* Release the poll/select data slot */ info->fds->priv = NULL; /* Then free the poll info container */ info->psock = NULL; } return OK; }