123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525 |
- /****************************************************************************
- * net/udp/udp_netpoll.c
- *
- * Copyright (C) 2008-2009, 2011-2015, 2018 Gregory Nutt. All rights
- * reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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 <nuttx/config.h>
- #include <stdint.h>
- #include <poll.h>
- #include <debug.h>
- #include <nuttx/kmalloc.h>
- #include <nuttx/wqueue.h>
- #include <nuttx/mm/iob.h>
- #include <nuttx/net/net.h>
- #include "devif/devif.h"
- #include "netdev/netdev.h"
- #include "socket/socket.h"
- #include "udp/udp.h"
- #ifdef HAVE_UDP_POLL
- /****************************************************************************
- * Private Types
- ****************************************************************************/
- /* This is an allocated container that holds the poll-related information */
- struct udp_poll_s
- {
- FAR struct socket *psock; /* Needed to handle loss of connection */
- FAR struct net_driver_s *dev; /* Needed to free the callback structure */
- struct pollfd *fds; /* Needed to handle poll events */
- FAR struct devif_callback_s *cb; /* Needed to teardown the poll */
- #if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_IOB_NOTIFIER)
- int16_t key; /* Needed to cancel pending notification */
- #endif
- };
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: udp_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 udp_poll_eventhandler(FAR struct net_driver_s *dev,
- FAR void *conn,
- FAR void *pvpriv, uint16_t flags)
- {
- FAR struct udp_poll_s *info = (FAR struct udp_poll_s *)pvpriv;
- ninfo("flags: %04x\n", flags);
- DEBUGASSERT(!info || (info->psock && info->fds));
- /* 'priv' might be null in some race conditions (?) */
- if (info)
- {
- pollevent_t eventset = 0;
- /* Check for data or connection availability events. */
- if ((flags & UDP_NEWDATA) != 0)
- {
- eventset |= (POLLIN & info->fds->events);
- }
- /* A poll is a sign that we are free to send data.
- * REVISIT: This is bogus: If CONFIG_UDP_WRITE_BUFFERS=y then
- * we never have to wait to send; otherwise, we always have to
- * wait to send. Receiving a poll is irrelevant.
- */
- if ((flags & UDP_POLL) != 0)
- {
- eventset |= (POLLOUT & info->fds->events);
- }
- /* Check for loss of connection events. */
- if ((flags & NETDEV_DOWN) != 0)
- {
- eventset |= ((POLLHUP | POLLERR) & info->fds->events);
- }
- /* Awaken the caller of poll() is requested event occurred. */
- if (eventset)
- {
- info->fds->revents |= eventset;
- nxsem_post(info->fds->sem);
- }
- }
- return flags;
- }
- /****************************************************************************
- * Name: udp_iob_work
- *
- * Description:
- * Work thread callback function execute when an IOB because available.
- *
- * Input Parameters:
- * psock - Socket state structure
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- #if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_IOB_NOTIFIER)
- static inline void udp_iob_work(FAR void *arg)
- {
- FAR struct work_notifier_entry_s *entry;
- FAR struct work_notifier_s *ninfo;
- FAR struct udp_poll_s *pinfo;
- FAR struct socket *psock;
- FAR struct pollfd *fds;
- entry = (FAR struct work_notifier_entry_s *)arg;
- DEBUGASSERT(entry != NULL);
- ninfo = &entry->info;
- DEBUGASSERT(ninfo->arg != NULL);
- pinfo = (FAR struct udp_poll_s *)ninfo->arg;
- DEBUGASSERT(pinfo->psock != NULL && pinfo->fds != NULL);
- psock = pinfo->psock;
- fds = pinfo->fds;
- /* Handle a race condition. Check if we have already posted the POLLOUT
- * event. If so, don't do it again.
- */
- if ((fds->events && POLLWRNORM) == 0 ||
- (fds->revents && POLLWRNORM) != 0)
- {
- /* Check if we are now able to send */
- if (psock_udp_cansend(psock) >= 0)
- {
- /* Yes.. then signal the poll logic */
- fds->revents |= POLLWRNORM;
- nxsem_post(fds->sem);
- }
- else
- {
- /* No.. ask for the IOB free notification again */
- pinfo->key = iob_notifier_setup(LPWORK, udp_iob_work, pinfo);
- }
- }
- /* Protocol for the use of the IOB notifier is that we free the argument
- * after the notification has been processed.
- */
- kmm_free(arg);
- }
- #endif
- /****************************************************************************
- * Name: udp_poll_txnotify
- *
- * Description:
- * Notify the appropriate device driver that we are have data ready to
- * be sent (UDP)
- *
- * Input Parameters:
- * psock - Socket state structure
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- #if !defined(CONFIG_NET_UDP_WRITE_BUFFERS) || !defined(CONFIG_IOB_NOTIFIER)
- static inline void udp_poll_txnotify(FAR struct socket *psock)
- {
- FAR struct udp_conn_s *conn = psock->s_conn;
- #ifdef CONFIG_NET_IPv4
- #ifdef CONFIG_NET_IPv6
- /* If both IPv4 and IPv6 support are enabled, then we will need to select
- * the device driver using the appropriate IP domain.
- */
- if (psock->s_domain == PF_INET)
- #endif
- {
- /* Notify the device driver that send data is available */
- netdev_ipv4_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
- }
- #endif /* CONFIG_NET_IPv4 */
- #ifdef CONFIG_NET_IPv6
- #ifdef CONFIG_NET_IPv4
- else /* if (psock->s_domain == PF_INET6) */
- #endif /* CONFIG_NET_IPv4 */
- {
- /* Notify the device driver that send data is available */
- DEBUGASSERT(psock->s_domain == PF_INET6);
- netdev_ipv6_txnotify(conn->u.ipv6.laddr, conn->u.ipv6.raddr);
- }
- #endif /* CONFIG_NET_IPv6 */
- }
- #endif
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: udp_pollsetup
- *
- * Description:
- * Setup to monitor events on one UDP/IP socket
- *
- * Input Parameters:
- * psock - The UDP/IP 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 udp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds)
- {
- FAR struct udp_conn_s *conn = psock->s_conn;
- FAR struct udp_poll_s *info;
- FAR struct devif_callback_s *cb;
- int ret;
- /* Sanity check */
- #ifdef CONFIG_DEBUG_FEATURES
- if (conn == NULL || fds == NULL)
- {
- return -EINVAL;
- }
- #endif
- /* Allocate a container to hold the poll information */
- info = (FAR struct udp_poll_s *)kmm_malloc(sizeof(struct udp_poll_s));
- if (!info)
- {
- return -ENOMEM;
- }
- /* Some of the following must be atomic */
- net_lock();
- /* Get the device that will provide the provide the NETDEV_DOWN event.
- * NOTE: in the event that the local socket is bound to INADDR_ANY, the
- * dev value will be zero and there will be no NETDEV_DOWN notifications.
- */
- info->dev = udp_find_laddr_device(conn);
- /* Allocate a UDP callback structure */
- cb = udp_callback_alloc(info->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;
- #if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_IOB_NOTIFIER)
- info->key = 0;
- #endif
- /* 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 = 0;
- cb->priv = (FAR void *)info;
- cb->event = udp_poll_eventhandler;
- if ((info->fds->events & POLLOUT) != 0)
- {
- cb->flags |= UDP_POLL;
- }
- if ((info->fds->events & POLLIN) != 0)
- {
- cb->flags |= UDP_NEWDATA;
- }
- if ((info->fds->events & (POLLHUP | POLLERR)) != 0)
- {
- cb->flags |= NETDEV_DOWN;
- }
- /* 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);
- }
- if (psock_udp_cansend(psock) >= 0)
- {
- /* Normal data may be sent without blocking (at least one byte). */
- 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);
- }
- #if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_IOB_NOTIFIER)
- /* If (1) revents == 0, (2) write buffering is enabled, and (3) the
- * POLLOUT event is needed, then setup to receive a notification an IOB
- * is freed.
- */
- else if ((fds->events & POLLOUT) != 0)
- {
- /* Ask for the IOB free notification */
- info->key = iob_notifier_setup(LPWORK, udp_iob_work, info);
- }
- #else
- /* If (1) the socket is in a bound state via bind() or via the
- * UDP_BINDTODEVICE socket options, (2) revents == 0, (3) write buffering
- * is not enabled (determined by a configuration setting), and (3) the
- * POLLOUT event is needed then request an immediate Tx poll from the
- * device associated with the binding.
- */
- else if ((fds->events & POLLOUT) != 0)
- {
- /* Check if the socket has been bound to a local address (might be
- * INADDR_ANY or the IPv6 unspecified address! In that case the
- * notification will fail)
- */
- if (_SS_ISBOUND(psock->s_flags))
- {
- udp_poll_txnotify(psock);
- }
- #ifdef CONFIG_NET_UDP_BINDTODEVICE
- /* Check if the socket has been bound to a device interface index via
- * the UDP_BINDTODEVICE socket option.
- */
- else if (conn->boundto > 0)
- {
- /* Yes, find the device associated with the interface index */
- FAR struct net_driver_s *dev = netdev_findbyindex(conn->boundto);
- if (dev != NULL)
- {
- /* And request a poll from the device */
- netdev_txnotify_dev(dev);
- }
- }
- #endif
- }
- #endif
- net_unlock();
- return OK;
- errout_with_lock:
- kmm_free(info);
- net_unlock();
- return ret;
- }
- /****************************************************************************
- * Name: udp_pollteardown
- *
- * Description:
- * Teardown monitoring of events on an UDP/IP socket
- *
- * Input Parameters:
- * psock - The UDP 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 udp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds)
- {
- FAR struct udp_conn_s *conn = psock->s_conn;
- FAR struct udp_poll_s *info;
- /* Sanity check */
- #ifdef CONFIG_DEBUG_FEATURES
- if (!conn || !fds->priv)
- {
- return -EINVAL;
- }
- #endif
- /* Recover the socket descriptor poll state info from the poll structure */
- info = (FAR struct udp_poll_s *)fds->priv;
- DEBUGASSERT(info != NULL && info->fds != NULL && info->cb != NULL);
- if (info != NULL)
- {
- #if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_IOB_NOTIFIER)
- /* Cancel any pending IOB free notification */
- if (info->key > 0)
- {
- /* Ask for the IOB free notification */
- iob_notifier_teardown(info->key);
- }
- #endif
- /* Release the callback */
- net_lock();
- udp_callback_free(info->dev, conn, info->cb);
- net_unlock();
- /* Release the poll/select data slot */
- info->fds->priv = NULL;
- /* Then free the poll info container */
- kmm_free(info);
- }
- return OK;
- }
- #endif /* !HAVE_UDP_POLL */
|