/**************************************************************************** * net/netdev/netdev.h * * Copyright (C) 2014-2015, 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. * ****************************************************************************/ #ifndef __NET_NETDEV_NETDEV_H #define __NET_NETDEV_NETDEV_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #ifdef CONFIG_NETDOWN_NOTIFIER # include #endif /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* If CONFIG_NETDEV_IFINDEX is enabled then there is limit to the number of * devices that can be registered due to the nature of some static data. */ #define MAX_IFINDEX 32 /**************************************************************************** * Public Data ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /* List of registered Ethernet device drivers. You must have the network * locked in order to access this list. * * NOTE that this duplicates a declaration in net/tcp/tcp.h */ EXTERN struct net_driver_s *g_netdevices; #ifdef CONFIG_NETDEV_IFINDEX /* The set of network devices that have been registered. This is used to * assign a unique device index to the newly registered device. * * REVISIT: The width of g_nassigned limits the number of registered * devices to 32 (MAX_IFINDEX). */ EXTERN uint32_t g_devset; /* The set of network devices that have been freed. The purpose of this * set is to postpone reuse of a interface index for as long as possible, * i.e., don't reuse an interface index until all of the possible indices * have been used. */ EXTERN uint32_t g_devfreed; #endif /**************************************************************************** * Public Types ****************************************************************************/ /* Callback from netdev_foreach() */ struct net_driver_s; /* Forward reference */ typedef int (*netdev_callback_t)(FAR struct net_driver_s *dev, FAR void *arg); /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: netdev_ifup / netdev_ifdown * * Description: * Bring the interface up/down * ****************************************************************************/ void netdev_ifup(FAR struct net_driver_s *dev); void netdev_ifdown(FAR struct net_driver_s *dev); /**************************************************************************** * Name: netdev_verify * * Description: * Verify that the specified device still exists * * Assumptions: * The caller has locked the network. * ****************************************************************************/ bool netdev_verify(FAR struct net_driver_s *dev); /**************************************************************************** * Name: netdev_findbyname * * Description: * Find a previously registered network device using its assigned * network interface name * * Input Parameters: * ifname The interface name of the device of interest * * Returned Value: * Pointer to driver on success; null on failure * ****************************************************************************/ FAR struct net_driver_s *netdev_findbyname(FAR const char *ifname); /**************************************************************************** * Name: netdev_foreach * * Description: * Enumerate each registered network device. This function will terminate * when either (1) all devices have been enumerated or (2) when a callback * returns any non-zero value. * * NOTE 1: The network must be locked throughout the enumeration. * NOTE 2: No checks are made on devices. For examples, callbacks will * will be made on network devices that are in the 'down' state. * The callback implementations must take into account all * network device state. Typically, a network in the down state * would not terminate the traversal. * * Input Parameters: * callback - Will be called for each registered device * arg - Opaque user argument passed to callback() * * Returned Value: * 0: Enumeration completed * 1: Enumeration terminated early by callback * * Assumptions: * The network is locked. * ****************************************************************************/ int netdev_foreach(netdev_callback_t callback, FAR void *arg); /**************************************************************************** * Name: netdev_findby_lipv4addr * * Description: * Find a previously registered network device by matching a local address * with the subnet served by the device. Only "up" devices are considered * (since a "down" device has no meaningful address). * * Input Parameters: * lipaddr - Local, IPv4 address assigned to the network device. Or any * IPv4 address on the sub-net served by the network device. * * Returned Value: * Pointer to driver on success; null on failure * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 FAR struct net_driver_s *netdev_findby_lipv4addr(in_addr_t lipaddr); #endif /**************************************************************************** * Name: netdev_findby_lipv6addr * * Description: * Find a previously registered network device by matching a local address * with the subnet served by the device. Only "up" devices are considered * (since a "down" device has no meaningful address). * * Input Parameters: * lipaddr - Local, IPv6 address assigned to the network device. Or any * IPv6 address on the sub-net served by the network device. * * Returned Value: * Pointer to driver on success; null on failure * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 FAR struct net_driver_s *netdev_findby_lipv6addr(const net_ipv6addr_t lipaddr); #endif /**************************************************************************** * Name: netdev_findby_ripv4addr * * Description: * Find a previously registered network device by matching the remote * IPv4 address that can be reached by the device. * * Input Parameters: * lipaddr - Local, bound address of a connection (used only if ripaddr is * the broadcast address). * ripaddr - Remote address of a connection to use in the lookup * * Returned Value: * Pointer to driver on success; null on failure * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 FAR struct net_driver_s *netdev_findby_ripv4addr(in_addr_t lipaddr, in_addr_t ripaddr); #endif /**************************************************************************** * Name: netdev_findby_ripv6addr * * Description: * Find a previously registered network device by matching the remote * IPv6 address that can be reached by the device. * * Input Parameters: * lipaddr - Local, bound address of a connection (used only if ripaddr is * a multicast address). * ripaddr - Remote address of a connection to use in the lookup * * Returned Value: * Pointer to driver on success; null on failure * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 FAR struct net_driver_s *netdev_findby_ripv6addr(const net_ipv6addr_t lipaddr, const net_ipv6addr_t ripaddr); #endif /**************************************************************************** * Name: netdev_findbyindex * * Description: * Find a previously registered network device by assigned interface index. * * Input Parameters: * ifindex - The interface index. This is a one-based index and must be * greater than zero. * * Returned Value: * Pointer to driver on success; NULL on failure. This function will return * NULL only if there is no device corresponding to the provided index. * ****************************************************************************/ FAR struct net_driver_s *netdev_findbyindex(int ifindex); /**************************************************************************** * Name: netdev_nextindex * * Description: * Return the interface index to the next valid device. * * Input Parameters: * ifindex - The first interface index to check. Usually in a traversal * this would be the previous interface index plus 1. * * Returned Value: * The interface index for the next network driver. -ENODEV is returned if * there are no further devices with assigned interface indices. * ****************************************************************************/ #ifdef CONFIG_NETDEV_IFINDEX int netdev_nextindex(int ifindex); #endif /**************************************************************************** * Name: netdev_indextoname * * Description: * The if_indextoname() function maps an interface index to its * corresponding name. * * Input Parameters: * ifname - Points to a buffer of at least IF_NAMESIZE bytes. * if_indextoname() will place in this buffer the name of the * interface with index ifindex. * * Returned Value: * If ifindex is an interface index, then the function will return zero * (OK). Otherwise, the function returns a negated errno value; * ****************************************************************************/ #ifdef CONFIG_NETDEV_IFINDEX int netdev_indextoname(unsigned int ifindex, FAR char *ifname); #endif /**************************************************************************** * Name: netdev_nametoindex * * Description: * The if_nametoindex() function returns the interface index corresponding * to name ifname. * * Input Parameters: * ifname - The interface name * * Returned Value: * The corresponding index if ifname is the name of an interface; * otherwise, a negated errno value is returned. * ****************************************************************************/ #ifdef CONFIG_NETDEV_IFINDEX unsigned int netdev_nametoindex(FAR const char *ifname); #endif /**************************************************************************** * Name: netdev_default * * Description: * Return the default network device. REVISIT: At present this function * arbitrarily returns the first UP device at the head of the device * list. Perhaps the default device should be a device name * configuration option? * * So why is this here: It represents my current though for what to do * if a socket is connected with INADDY_ANY. In this case, I suppose we * should use the IP address associated with some default device??? * * Input Parameters: * NULL * * Returned Value: * Pointer to default network driver on success; null on failure * ****************************************************************************/ FAR struct net_driver_s *netdev_default(void); /**************************************************************************** * Name: netdev_ipv4_txnotify * * Description: * Notify the device driver that forwards the IPv4 address that new TX * data is available. * * Input Parameters: * lipaddr - The local address bound to the socket * ripaddr - The remote address to send the data * * Returned Value: * None * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 void netdev_ipv4_txnotify(in_addr_t lipaddr, in_addr_t ripaddr); #endif /* CONFIG_NET_IPv4 */ /**************************************************************************** * Name: netdev_ipv6_txnotify * * Description: * Notify the device driver that forwards the IPv4 address that new TX * data is available. * * Input Parameters: * lipaddr - The local address bound to the socket * ripaddr - The remote address to send the data * * Returned Value: * None * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 void netdev_ipv6_txnotify(FAR const net_ipv6addr_t lipaddr, FAR const net_ipv6addr_t ripaddr); #endif /* CONFIG_NET_IPv6 */ /**************************************************************************** * Name: netdev_txnotify_dev * * Description: * Notify the device driver that new TX data is available. This variant * would be called when the upper level logic already understands how the * packet will be routed. * * Input Parameters: * dev - The network device driver state structure. * * Returned Value: * None * ****************************************************************************/ void netdev_txnotify_dev(FAR struct net_driver_s *dev); /**************************************************************************** * Name: netdev_count * * Description: * Return the number of network devices * * Input Parameters: * None * * Returned Value: * The number of network devices * ****************************************************************************/ int netdev_count(void); /**************************************************************************** * Name: netdev_ipv4_ifconf * * Description: * Return the IPv4 configuration of each network adapter * * Input Parameters: * ifc - A reference to the instance of struct ifconf in which to return * the information. * * Returned Value: * Zero is returned on success; a negated errno value is returned on any * failure. * * Assumptions: * The network is locked * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 struct ifconf; /* Forward reference */ int netdev_ipv4_ifconf(FAR struct ifconf *ifc); #endif /**************************************************************************** * Name: netdev_ipv6_ifconf * * Description: * Return the IPv6 configuration of each network adapter * * Input Parameters: * lifc - A reference to the instance of struct lifconf in which to return * the information. * * Returned Value: * Zero is returned on success; a negated errno value is returned on any * failure. * * Assumptions: * The network is locked * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 struct lifconf; /* Forward reference */ int netdev_ipv6_ifconf(FAR struct lifconf *lifc); #endif /**************************************************************************** * Name: netdown_notifier_setup * * Description: * Set up to perform a callback to the worker function when the network * goes down. The worker function will execute on the high priority * worker thread. * * Input Parameters: * worker - The worker function to execute on the high priority work * queue when data is available in the UDP readahead buffer. * dev - The network driver to be monitored * arg - A user-defined argument that will be available to the worker * function when it runs. * Returned Value: * > 0 - The signal notification is in place. The returned value is a * key that may be used later in a call to * netdown_notifier_teardown(). * == 0 - The the device is already down. No signal notification will * be provided. * < 0 - An unexpected error occurred and no signal will be sent. The * returned value is a negated errno value that indicates the * nature of the failure. * ****************************************************************************/ #ifdef CONFIG_NETDOWN_NOTIFIER int netdown_notifier_setup(worker_t worker, FAR struct net_driver_s *dev, FAR void *arg); #endif /**************************************************************************** * Name: netdown_notifier_teardown * * Description: * Eliminate a network down notification previously setup by * netdown_notifier_setup(). This function should only be called if the * notification should be aborted prior to the notification. The * notification will automatically be torn down after the signal is sent. * * Input Parameters: * key - The key value returned from a previous call to * netdown_notifier_setup(). * * Returned Value: * Zero (OK) is returned on success; a negated errno value is returned on * any failure. * ****************************************************************************/ #ifdef CONFIG_NETDOWN_NOTIFIER int netdown_notifier_teardown(int key); #endif /**************************************************************************** * Name: netdown_notifier_signal * * Description: * A network has gone down has been buffered. Execute worker thread * functions for all threads monitoring the state of the device. * * Input Parameters: * dev - The TCP connection where read-ahead data was just buffered. * * Returned Value: * None. * ****************************************************************************/ #ifdef CONFIG_NETDOWN_NOTIFIER void netdown_notifier_signal(FAR struct net_driver_s *dev); #endif #undef EXTERN #ifdef __cplusplus } #endif #endif /* __NET_NETDEV_NETDEV_H */