/**************************************************************************** * net/pkt/pkt.h * * Copyright (C) 2014, 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. * ****************************************************************************/ #ifndef _NET_PKT_PKT_H #define _NET_PKT_PKT_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #ifdef CONFIG_NET_PKT /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Allocate a new packet socket data callback */ #define pkt_callback_alloc(dev,conn) \ devif_callback_alloc(dev, &conn->list) #define pkt_callback_free(dev,conn,cb) \ devif_conn_callback_free(dev, cb, &conn->list) /**************************************************************************** * Public Type Definitions ****************************************************************************/ /* Representation of a packet socket connection */ struct devif_callback_s; /* Forward reference */ struct pkt_conn_s { /* Common prologue of all connection structures. */ dq_entry_t node; /* Supports a double linked list */ /* This is a list of Pkt connection callbacks. Each callback represents * a thread that is stalled, waiting for a device-specific event. */ struct devif_callback_s *list; /* Pkt socket-specific content follows */ uint8_t lmac[6]; /* The local Ethernet address in network byte order */ uint8_t ifindex; uint16_t proto; uint8_t crefs; /* Reference counts on this instance */ }; /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus # define EXTERN extern "C" extern "C" { #else # define EXTERN extern #endif /* The packet socket interface */ EXTERN const struct sock_intf_s g_pkt_sockif; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ struct net_driver_s; /* Forward reference */ struct eth_hdr_s; /* Forward reference */ struct socket; /* Forward reference */ /**************************************************************************** * Name: pkt_initialize() * * Description: * Initialize the packet socket connection structures. Called once and * only from the network initialization logic. * ****************************************************************************/ void pkt_initialize(void); /**************************************************************************** * Name: pkt_alloc() * * Description: * Allocate a new, uninitialized packet socket connection structure. This * is normally something done by the implementation of the socket() API * ****************************************************************************/ FAR struct pkt_conn_s *pkt_alloc(void); /**************************************************************************** * Name: pkt_free() * * Description: * Free a packet socket connection structure that is no longer in use. * This should be done by the implementation of close(). * ****************************************************************************/ void pkt_free(FAR struct pkt_conn_s *conn); /**************************************************************************** * Name: pkt_active() * * Description: * Find a connection structure that is the appropriate * connection to be used with the provided Ethernet header * * Assumptions: * This function is called from network logic at with the network locked. * ****************************************************************************/ FAR struct pkt_conn_s *pkt_active(FAR struct eth_hdr_s *buf); /**************************************************************************** * Name: pkt_nextconn() * * Description: * Traverse the list of allocated packet connections * * Assumptions: * This function is called from network logic at with the network locked. * ****************************************************************************/ FAR struct pkt_conn_s *pkt_nextconn(FAR struct pkt_conn_s *conn); /**************************************************************************** * Name: pkt_callback * * Description: * Inform the application holding the packet socket of a change in state. * * Returned Value: * OK if packet has been processed, otherwise ERROR. * * Assumptions: * This function is called from network logic at with the network locked. * ****************************************************************************/ uint16_t pkt_callback(FAR struct net_driver_s *dev, FAR struct pkt_conn_s *conn, uint16_t flags); /**************************************************************************** * Name: pkt_input * * Description: * Handle incoming packet input * * This function provides the interface between Ethernet device drivers and * packet socket logic. All frames that are received should be provided to * pkt_input() prior to other routing. * * Input Parameters: * dev - The device driver structure containing the received packet * * Returned Value: * OK The packet has been processed and can be deleted * ERROR There is a matching connection, but could not dispatch the packet * yet. Useful when a packet arrives before a recv call is in * place. * * Assumptions: * Called from the network diver with the network locked. * ****************************************************************************/ /* pkt_input() is prototyped in include/nuttx/net/pkt.h */ /**************************************************************************** * Name: pkt_recvfrom * * Description: * Implements the socket recvfrom interface for the case of the AF_INET * and AF_INET6 address families. pkt_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). * ****************************************************************************/ ssize_t pkt_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len, int flags, FAR struct sockaddr *from, FAR socklen_t *fromlen); /**************************************************************************** * Name: pkt_find_device * * Description: * Select the network driver to use with the PKT transaction. * * Input Parameters: * conn - PKT connection structure (not currently used). * * Returned Value: * A pointer to the network driver to use. * ****************************************************************************/ FAR struct net_driver_s *pkt_find_device(FAR struct pkt_conn_s *conn); /**************************************************************************** * Name: pkt_poll * * Description: * Poll a packet "connection" structure for availability of TX data * * Input Parameters: * dev - The device driver structure to use in the send operation * conn - The packet "connection" to poll for TX data * * Returned Value: * None * * Assumptions: * Called from the network device interface (devif) with the network * locked. * ****************************************************************************/ void pkt_poll(FAR struct net_driver_s *dev, FAR struct pkt_conn_s *conn); /**************************************************************************** * Name: psock_pkt_send * * Description: * The psock_pkt_send() call may be used only when the packet socket is in a * connected state (so that the intended recipient is known). * * Input Parameters: * psock An instance of the internal socket structure. * buf Data to send * len Length of data to send * * Returned Value: * On success, returns the number of characters sent. On error, * a negated errno value is retruend. See send() for the complete list * of return values. * ****************************************************************************/ struct socket; ssize_t psock_pkt_send(FAR struct socket *psock, FAR const void *buf, size_t len); #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_NET_PKT */ #endif /* _NET_PKT_PKT_H */