/**************************************************************************** * net/icmp/icmp.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __NET_ICMP_ICMP_H #define __NET_ICMP_ICMP_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #if defined(CONFIG_NET_ICMP) && !defined(CONFIG_NET_ICMP_NO_STACK) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define NET_ICMP_HAVE_STACK 1 /* Allocate/free an ICMP data callback */ #define icmp_callback_alloc(dev, conn) \ devif_callback_alloc((dev), &(conn)->list, &(conn)->list_tail) #define icmp_callback_free(dev, conn, cb) \ devif_conn_callback_free((dev), (cb), &(conn)->list, &(conn)->list_tail) /**************************************************************************** * Public types ****************************************************************************/ struct socket; /* Forward reference */ struct sockaddr; /* Forward reference */ struct pollfd; /* Forward reference */ #ifdef CONFIG_NET_ICMP_SOCKET /* Representation of a IPPROTO_ICMP socket connection */ struct devif_callback_s; /* Forward reference */ /* This is a container that holds the poll-related information */ struct icmp_poll_s { FAR struct socket *psock; /* IPPROTO_ICMP socket structure */ FAR struct pollfd *fds; /* Needed to handle poll events */ FAR struct devif_callback_s *cb; /* Needed to teardown the poll */ }; struct icmp_conn_s { /* Common prologue of all connection structures. */ dq_entry_t node; /* Supports a doubly linked list */ /* This is a list of ICMP callbacks. Each callback represents a thread * that is stalled, waiting for a device-specific event. */ FAR struct devif_callback_s *list; FAR struct devif_callback_s *list_tail; /* ICMP-specific content follows */ uint16_t id; /* ICMP ECHO request ID */ uint8_t nreqs; /* Number of requests with no response received */ uint8_t crefs; /* Reference counts on this instance */ /* The device that the ICMP request was sent on */ FAR struct net_driver_s *dev; /* Needed to free the callback structure */ /* ICMP response read-ahead list. A singly linked list of type struct * iob_qentry_s where the ICMP read-ahead data for the current ID is * retained. */ struct iob_queue_s readahead; /* Read-ahead buffering */ /* The following is a list of poll structures of threads waiting for * socket events. */ struct icmp_poll_s pollinfo[CONFIG_NET_ICMP_NPOLLWAITERS]; }; #endif /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus # define EXTERN extern "C" extern "C" { #else # define EXTERN extern #endif #ifdef CONFIG_NET_ICMP_SOCKET /* PF_INET socket address family, IPPROTO_ICMP protocol interface */ EXTERN const struct sock_intf_s g_icmp_sockif; #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: icmp_input * * Description: * Handle incoming ICMP input * * Input Parameters: * dev - The device driver structure containing the received ICMP * packet * * Returned Value: * None * * Assumptions: * The network is locked. * ****************************************************************************/ void icmp_input(FAR struct net_driver_s *dev); /**************************************************************************** * Name: icmp_sock_initialize * * Description: * Initialize the IPPROTO_ICMP socket connection structures. Called once * and only from the network initialization layer. * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET void icmp_sock_initialize(void); #endif /**************************************************************************** * Name: icmp_alloc * * Description: * Allocate a new, uninitialized IPPROTO_ICMP socket connection structure. * This is normally something done by the implementation of the socket() * interface. * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET FAR struct icmp_conn_s *icmp_alloc(void); #endif /**************************************************************************** * Name: icmp_free * * Description: * Free a IPPROTO_ICMP socket connection structure that is no longer in * use. This should be done by the implementation of close(). * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET void icmp_free(FAR struct icmp_conn_s *conn); #endif /**************************************************************************** * Name: icmp_active() * * Description: * Find a connection structure that is the appropriate connection to be * used with the provided ECHO request ID. * * Assumptions: * This function is called from network logic at with the network locked. * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET FAR struct icmp_conn_s *icmp_active(uint16_t id); #endif /**************************************************************************** * Name: icmp_nextconn * * Description: * Traverse the list of allocated packet connections * * Assumptions: * This function is called from network logic at with the network locked. * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET FAR struct icmp_conn_s *icmp_nextconn(FAR struct icmp_conn_s *conn); #endif /**************************************************************************** * Name: icmp_findconn * * Description: * Find an ICMP connection structure that is expecting a ICMP ECHO response * with this ID from this device * * Assumptions: * This function is called from network logic at with the network locked. * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET FAR struct icmp_conn_s *icmp_findconn(FAR struct net_driver_s *dev, uint16_t id); #endif /**************************************************************************** * Name: icmp_poll * * Description: * Poll a device "connection" structure for availability of ICMP TX data * * Input Parameters: * dev - The device driver structure to use in the send operation * conn - A pointer to the ICMP connection structure * * Returned Value: * None * * Assumptions: * The network is locked. * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET void icmp_poll(FAR struct net_driver_s *dev, FAR struct icmp_conn_s *conn); #endif /**************************************************************************** * Name: icmp_sendmsg * * Description: * Implements the sendmsg() operation for the case of the IPPROTO_ICMP * socket. The 'buf' parameter points to a block of memory that includes * an ICMP request header, followed by any payload that accompanies the * request. The 'len' parameter includes both the size of the ICMP header * and the following payload. * * Input Parameters: * psock A pointer to a NuttX-specific, internal socket structure * msg Message to send * flags Send flags * * Returned Value: * On success, returns the number of characters sent. On error, a negated * errno value is returned (see sendmsg() for the list of appropriate error * values. * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET ssize_t icmp_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg, int flags); #endif /**************************************************************************** * Name: icmp_recvmsg * * Description: * Implements the socket recvfrom interface for the case of the AF_INET * data gram socket with the IPPROTO_ICMP protocol. icmp_recvmsg() * receives ICMP ECHO replies for the a socket. * * If msg_name is not NULL, and the underlying protocol provides the source * address, this source address is filled in. The argument 'msg_namelen' is * initialized to the size of the buffer associated with msg_name, 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 * msg Buffer to receive the message * flags Receive flags * * 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, * recvmsg() will return 0. Otherwise, on errors, a negated errno value is * returned (see recvmsg() for the list of appropriate error values). * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET ssize_t icmp_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg, int flags); #endif /**************************************************************************** * 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 * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET int icmp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds); #endif /**************************************************************************** * 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 * ****************************************************************************/ #ifdef CONFIG_NET_ICMP_SOCKET int icmp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds); #endif /**************************************************************************** * Name: icmp_reply * * Description: * Send an ICMP message in response to a situation * RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. * MAY send more (we do). * MUST NOT change this header information. * MUST NOT reply to a multicast/broadcast IP address. * MUST NOT reply to a multicast/broadcast MAC address. * MUST reply to only the first fragment. * * Input Parameters: * dev - The device driver structure containing the received packet * type - ICMP Message Type, eg. ICMP_DEST_UNREACHABLE * code - ICMP Message Code, eg. ICMP_PORT_UNREACH * * Returned Value: * None * ****************************************************************************/ void icmp_reply(FAR struct net_driver_s *dev, int type, int code); #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_NET_ICMP && !CONFIG_NET_ICMP_NO_STACK */ #endif /* __NET_ICMP_ICMP_H */