/**************************************************************************** * net/devif/devif.h * * Copyright (C) 2007-2009, 2013-2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * This logic was leveraged from uIP which also has a BSD-style license: * * Author Adam Dunkels * Copyright (c) 2001-2003, Adam Dunkels. * All rights reserved. * * 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. The name of the author may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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_DEVIF_DEVIF_H #define _NET_DEVIF_DEVIF_H /**************************************************************************** * Included Files ****************************************************************************/ #include #ifdef CONFIG_NET #include #include #include #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* The following flags may be set in the set of flags by the lower, device- * interfacing layer before calling through the socket layer callback. The * TCP_ACKDATA, XYZ_NEWDATA, and TCP_CLOSE flags may be set at the same time, * whereas the others are mutually exclusive. * * Connection Specific Events: These are events that may be notified * through callback lists residing in TCP, UDP, or PKT port connection * structures: * * TCP_ACKDATA IN: Signifies that the outstanding data was ACKed and * the socket layer should send out new data instead * of retransmitting the last data (TCP only) * OUT: Input state must be preserved on output. * * TCP_NEWDATA IN: Set to indicate that the peer has sent us new data. * UDP_NEWDATA OUT: Cleared (only) by the socket layer logic to indicate * PKT_NEWDATA that the new data was consumed, suppressing further * attempts to process the new data. * * TCP_SNDACK IN: Not used; always zero * OUT: Set by the socket layer if the new data was consumed * and an ACK should be sent in the response. (TCP only) * * TCP_REXMIT IN: Tells the socket layer to retransmit the data that * was last sent. (TCP only) * OUT: Not used * * TCP_POLL IN: Used for polling the socket layer. This is provided * UDP_POLL periodically from the drivers to support (1) timed * PKT_POLL operations, and (2) to check if the socket layer has * data that it wants to send. These are socket oriented * callbacks where the context depends on the specific * set * OUT: Not used * * TCP_BACKLOG IN: There is a new connection in the backlog list set * up by the listen() command. (TCP only) * OUT: Not used * * TCP_CLOSE IN: The remote host has closed the connection, thus the * connection has gone away. (TCP only) * OUT: The socket layer signals that it wants to close the * connection. (TCP only) * * TCP_ABORT IN: The remote host has aborted the connection, thus the * connection has gone away. (TCP only) * OUT: The socket layer signals that it wants to abort the * connection. (TCP only) * * TCP_CONNECTED IN: We have got a connection from a remote host and have * set up a new connection for it, or an active connection * has been successfully established. (TCP only) * OUT: Not used * * TCP_TIMEDOUT IN: The connection has been aborted due to too many * retransmissions. (TCP only) * OUT: Not used * * Device Specific Events: These are events that may be notified through * callback lists residing in the network device structure. * * ICMP_NEWDATA IN: Set to indicate that the peer has sent us new data. * ICMPv6_NEWDATA OUT: Cleared (only) by the socket layer logic to indicate * that the new data was consumed, suppressing further * attempts to process the new data. * * ARP_POLL IN: Used for polling the socket layer. This is provided * periodically from the drivers to support (1) timed * operations, and (2) to check if the ARP layer needs * to send an ARP request. This is a device oriented * event, not associated with a socket. * OUT: Not used * * ICMP_POLL IN: Used for polling the socket layer. This is provided * periodically from the drivers to support (1) timed * operations, and (2) to check if the ICMP layer needs * to send an ARP request. This is a device oriented * event, not associated with a socket. This differs * from ICMPv6_POLL only in that the appdata pointer * is set differently * OUT: Not used * * ICMPv6_POLL IN: Used for polling the socket layer. This is provided * periodically from the drivers to support (1) timed * operations, and (2) to check if the ICMP layer needs * to send an ARP request. This is a device oriented * event, not associated with a socket. This differs * from ICMP_POLL only in that the appdata pointer * is set differently * OUT: Not used * * ICMP_ECHOREPLY IN: An ICMP Echo Reply has been received. Used to support * ICMP ping from the socket layer. (ICMPv4 only) * OUT: Cleared (only) by the socket layer logic to indicate * that the reply was processed, suppressing further * attempts to process the reply. * * ICMPv6_ECHOREPLY IN: An ICMP Echo Reply has been received. Used to support * ICMP ping from the socket layer. (ICMPv6 only) * OUT: Cleared (only) by the socket layer logic to indicate * that the reply was processed, suppressing further * attempts to process the reply. * * NETDEV_DOWN: IN: The network device has been taken down. * OUT: Not used */ /* Connection specific events */ #define TCP_ACKDATA (1 << 0) #define TCP_NEWDATA (1 << 1) #define UDP_NEWDATA TCP_NEWDATA #define PKT_NEWDATA TCP_NEWDATA #define TCP_SNDACK (1 << 2) #define TCP_REXMIT (1 << 3) #define TCP_POLL (1 << 4) #define UDP_POLL TCP_POLL #define PKT_POLL TCP_POLL #define TCP_BACKLOG (1 << 5) #define TCP_CLOSE (1 << 6) #define TCP_ABORT (1 << 7) #define TCP_CONNECTED (1 << 8) #define TCP_TIMEDOUT (1 << 9) /* Device specific events */ #define ICMP_NEWDATA TCP_NEWDATA #define ICMPv6_NEWDATA TCP_NEWDATA #define ARP_POLL (1 << 10) #define ICMP_POLL (1 << 11) #define ICMPv6_POLL (1 << 12) #define ICMP_ECHOREPLY (1 << 13) #define ICMPv6_ECHOREPLY (1 << 14) #define NETDEV_DOWN (1 << 15) /* The set of events that and implications to the TCP connection state */ #define TCP_CONN_EVENTS \ (TCP_CLOSE | TCP_ABORT | TCP_CONNECTED | TCP_TIMEDOUT | NETDEV_DOWN) #define TCP_DISCONN_EVENTS \ (TCP_CLOSE | TCP_ABORT | TCP_TIMEDOUT | NETDEV_DOWN) /* IPv4/IPv6 Helpers */ #ifdef CONFIG_NET_IPv4 # define DEVIF_IS_IPv4(dev) IFF_IS_IPv4(dev->d_flags) #else # define DEVIF_IS_IPv4(dev) (0) #endif #ifdef CONFIG_NET_IPv6 # define DEVIF_IS_IPv6(dev) IFF_IS_IPv6(dev->d_flags) #else # define DEVIF_IS_IPv6(dev) (0) #endif /**************************************************************************** * Public Type Definitions ****************************************************************************/ /* Describes a connection/device event callback interface * * nxtconn - Supports a singly linked list that supports connection * specific event handlers. * nxtdev - Supports a singly linked list that supports device specific * event handlers * event - Provides the address of the callback function entry point. * pvconn is a pointer to a connection-specific datat structure * such as struct tcp_conn_s or struct udp_conn_s. * priv - Holds a reference to socket layer specific data that will * provided * flags - Set by the socket layer to inform the lower layer which flags * are and are not handled by the callback. */ struct net_driver_s; /* Forward reference */ struct devif_callback_s { FAR struct devif_callback_s *nxtconn; FAR struct devif_callback_s *nxtdev; uint16_t (*event)(FAR struct net_driver_s *dev, FAR void *pvconn, FAR void *pvpriv, uint16_t flags); FAR void *priv; uint16_t flags; }; /**************************************************************************** * Public Data ****************************************************************************/ /* Increasing number used for the IP ID field. */ extern uint16_t g_ipid; #if defined(CONFIG_NET_TCP_REASSEMBLY) && !defined(CONFIG_NET_IPv6) /* Reassembly timer (units: deci-seconds) */ extern uint8_t g_reassembly_timer; #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #ifdef __cplusplus #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Name: devif_initialize * * Description: * Perform initialization of the network device interface layer * * Parameters: * None * * Return: * None * ****************************************************************************/ void devif_initialize(void); /**************************************************************************** * Function: devif_callback_init * * Description: * Configure the pre-allocated callback structures into a free list. * * Assumptions: * This function is called with interrupts disabled. * ****************************************************************************/ void devif_callback_init(void); /**************************************************************************** * Function: devif_callback_alloc * * Description: * Allocate a callback container from the free list. * * If dev is non-NULL, then this function verifies that the device * reference is still valid and that the device is still UP status. If * those conditions are not true, this function will fail to allocate the * callback. * * Assumptions: * This function is called with the network locked. * ****************************************************************************/ FAR struct devif_callback_s * devif_callback_alloc(FAR struct net_driver_s *dev, FAR struct devif_callback_s **list); /**************************************************************************** * Function: devif_conn_callback_free * * Description: * Return a connection/port callback container to the free list. * * This function is just a front-end for devif_callback_free(). If the * dev argument is non-NULL, it will verify that the device reference is * still valid before attempting to free the callback structure. A * non-NULL list pointer is assumed to be valid in any case. * * The callback structure will be freed in any event. * * Assumptions: * This function is called with the network locked. * ****************************************************************************/ void devif_conn_callback_free(FAR struct net_driver_s *dev, FAR struct devif_callback_s *cb, FAR struct devif_callback_s **list); /**************************************************************************** * Function: devif_dev_callback_free * * Description: * Return a device callback container to the free list. * * This function is just a front-end for devif_callback_free(). If the * de argument is non-NULL, it will verify that the device reference is * still valid before attempting to free the callback structure. It * differs from devif_conn_callback_free in that connection/port-related * connections are also associated with the device and, hence, also will * not be valid if the device pointer is not valid. * * The callback structure will be freed in any event. * * Assumptions: * This function is called with the network locked. * ****************************************************************************/ void devif_dev_callback_free(FAR struct net_driver_s *dev, FAR struct devif_callback_s *cb); /**************************************************************************** * Function: devif_conn_event * * Description: * Execute a list of callbacks. * * Input parameters: * dev - The network device state structure associated with the network * device that initiated the callback event. * pvconn - Holds a reference to the TCP connection structure or the UDP * port structure. May be NULL if the even is not related to a TCP * connection or UDP port. * flags - The bit set of events to be notified. * list - The list to traverse in performing the notifications * * Returned value: * The updated flags as modified by the callback functions. * * Assumptions: * This function is called with the network locked. * ****************************************************************************/ uint16_t devif_conn_event(FAR struct net_driver_s *dev, FAR void *pvconn, uint16_t flags, FAR struct devif_callback_s *list); /**************************************************************************** * Function: devif_dev_event * * Description: * Execute a list of callbacks using the device event chain. * * Input parameters: * dev - The network device state structure associated with the network * device that initiated the callback event. * pvconn - Holds a reference to the TCP connection structure or the UDP * port structure. May be NULL if the even is not related to a TCP * connection or UDP port. * flags - The bit set of events to be notified. * * Returned value: * The updated flags as modified by the callback functions. * * Assumptions: * This function is called with the network locked. * ****************************************************************************/ uint16_t devif_dev_event(FAR struct net_driver_s *dev, void *pvconn, uint16_t flags); /**************************************************************************** * Send data on the current connection. * * This function is used to send out a single segment of TCP data. Only * socket logic that have been invoked by the lower level for event * processing can send data. * * The amount of data that actually is sent out after a call to this * function is determined by the maximum amount of data TCP allows. uIP * will automatically crop the data so that only the appropriate * amount of data is sent. The function tcp_mss() can be used to query * uIP for the amount of data that actually will be sent. * * Note: This function does not guarantee that the sent data will * arrive at the destination. If the data is lost in the network, the * TCP socket layer will be invoked with the TCP_REXMIT flag set. The * socket layer will then have to resend the data using this function. * * data A pointer to the data which is to be sent. * * len The maximum amount of data bytes to be sent. * ****************************************************************************/ void devif_send(FAR struct net_driver_s *dev, FAR const void *buf, int len); /**************************************************************************** * Name: devif_iob_send * * Description: * Called from socket logic in response to a xmit or poll request from the * the network interface driver. * * This is identical to calling devif_send() except that the data is * in an I/O buffer chain, rather than a flat buffer. * * Assumptions: * Called from the interrupt level or, at a minimum, with interrupts * disabled. * ****************************************************************************/ #ifdef CONFIG_NET_IOB struct iob_s; void devif_iob_send(FAR struct net_driver_s *dev, FAR struct iob_s *buf, unsigned int len, unsigned int offset); #endif /**************************************************************************** * Name: devif_pkt_send * * Description: * Called from socket logic in order to send a raw packet in response to * an xmit or poll request from the the network interface driver. * * This is almost identical to calling devif_send() except that the data to * be sent is copied into dev->d_buf (vs. dev->d_appdata), since there is * no header on the data. * * Assumptions: * Called from the interrupt level or, at a minimum, with interrupts * disabled. * ****************************************************************************/ #ifdef CONFIG_NET_PKT void devif_pkt_send(FAR struct net_driver_s *dev, FAR const void *buf, unsigned int len); #endif #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_NET */ #endif /* _NET_DEVIF_DEVIF_H */