/**************************************************************************** * net/socket/icmp_sockif.c * * Copyright (C) 2017 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include "icmp/icmp.h" #ifdef CONFIG_NET_ICMP_SOCKET /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static int icmp_setup(FAR struct socket *psock, int protocol); static sockcaps_t icmp_sockcaps(FAR struct socket *psock); static void icmp_addref(FAR struct socket *psock); static int icmp_bind(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen); static int icmp_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen); static int icmp_getpeername(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen); static int icmp_listen(FAR struct socket *psock, int backlog); static int icmp_connect(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen); static int icmp_accept(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen, FAR struct socket *newsock); static int icmp_netpoll(FAR struct socket *psock, FAR struct pollfd *fds, bool setup); static ssize_t icmp_send(FAR struct socket *psock, FAR const void *buf, size_t len, int flags); static int icmp_close(FAR struct socket *psock); /**************************************************************************** * Public Data ****************************************************************************/ const struct sock_intf_s g_icmp_sockif = { icmp_setup, /* si_setup */ icmp_sockcaps, /* si_sockcaps */ icmp_addref, /* si_addref */ icmp_bind, /* si_bind */ icmp_getsockname, /* si_getsockname */ icmp_getpeername, /* si_getpeername */ icmp_listen, /* si_listen */ icmp_connect, /* si_connect */ icmp_accept, /* si_accept */ icmp_netpoll, /* si_poll */ icmp_send, /* si_send */ icmp_sendto, /* si_sendto */ #ifdef CONFIG_NET_SENDFILE NULL, /* si_sendfile */ #endif icmp_recvfrom, /* si_recvfrom */ icmp_close /* si_close */ }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: icmp_setup * * Description: * Called for socket() to verify that the provided socket type and * protocol are usable by this address family. Perform any family- * specific socket fields. * * Input Parameters: * psock A pointer to a user allocated socket structure to be * initialized. * protocol (see sys/socket.h) * * Returned Value: * Zero (OK) is returned on success. Otherwise, a negated errno value is * returned. * ****************************************************************************/ static int icmp_setup(FAR struct socket *psock, int protocol) { /* Only SOCK_DGRAM and IPPROTO_ICMP are supported */ if (psock->s_type == SOCK_DGRAM && protocol == IPPROTO_ICMP) { /* Allocate the IPPROTO_ICMP socket connection structure and save in * the new socket instance. */ FAR struct icmp_conn_s *conn = icmp_alloc(); if (conn == NULL) { /* Failed to reserve a connection structure */ return -ENOMEM; } /* Set the reference count on the connection structure. * This reference count will be incremented only if the socket is * dup'ed */ DEBUGASSERT(conn->crefs == 0); conn->crefs = 1; /* Save the pre-allocated connection in the socket structure */ psock->s_conn = conn; return OK; } else { return -EPROTONOSUPPORT; } } /**************************************************************************** * Name: icmp_sockcaps * * Description: * Return the bit encoded capabilities of this socket. * * Input Parameters: * psock - Socket structure of the socket whose capabilities are being * queried. * * Returned Value: * The set of socket cababilities is returned. * ****************************************************************************/ static sockcaps_t icmp_sockcaps(FAR struct socket *psock) { return 0; } /**************************************************************************** * Name: icmp_addref * * Description: * Increment the reference count on the underlying connection structure. * * Input Parameters: * psock - Socket structure of the socket whose reference count will be * incremented. * * Returned Value: * None * ****************************************************************************/ static void icmp_addref(FAR struct socket *psock) { FAR struct icmp_conn_s *conn; DEBUGASSERT(psock != NULL && psock->s_conn != NULL); conn = psock->s_conn; DEBUGASSERT(conn->crefs > 0 && conn->crefs < 255); conn->crefs++; } /**************************************************************************** * Name: icmp_connect * * Description: * icmp_connect() connects the local socket referred to by the structure * 'psock' to the address specified by 'addr'. The addrlen argument * specifies the size of 'addr'. The format of the address in 'addr' is * determined by the address space of the socket 'psock'. * * If the socket 'psock' is of type SOCK_DGRAM then 'addr' is the address * to which datagrams are sent by default, and the only address from which * datagrams are received. If the socket is of type SOCK_STREAM or * SOCK_SEQPACKET, this call attempts to make a connection to the socket * that is bound to the address specified by 'addr'. * * Generally, connection-based protocol sockets may successfully * icmp_connect() only once; connectionless protocol sockets may use * icmp_connect() multiple times to change their association. * Connectionless sockets may dissolve the association by connecting to * an address with the sa_family member of sockaddr set to AF_UNSPEC. * * Input Parameters: * psock Pointer to a socket structure initialized by psock_socket() * addr Server address (form depends on type of socket) * addrlen Length of actual 'addr' * * Returned Value: * 0 on success; a negated errno value on failure. See connect() for the * list of appropriate errno values to be returned. * ****************************************************************************/ static int icmp_connect(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen) { return -EAFNOSUPPORT; } /**************************************************************************** * Name: icmp_accept * * Description: * The icmp_accept function is used with connection-based socket types * (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first * connection request on the queue of pending connections, creates a new * connected socket with mostly the same properties as 'sockfd', and * allocates a new socket descriptor for the socket, which is returned. The * newly created socket is no longer in the listening state. The original * socket 'sockfd' is unaffected by this call. Per file descriptor flags * are not inherited across an icmp_accept. * * The 'sockfd' argument is a socket descriptor that has been created with * socket(), bound to a local address with bind(), and is listening for * connections after a call to listen(). * * On return, the 'addr' structure is filled in with the address of the * connecting entity. The 'addrlen' argument initially contains the size * of the structure pointed to by 'addr'; on return it will contain the * actual length of the address returned. * * If no pending connections are present on the queue, and the socket is * not marked as non-blocking, icmp_accept blocks the caller until a * connection is present. If the socket is marked non-blocking and no * pending connections are present on the queue, icmp_accept returns * EAGAIN. * * Input Parameters: * psock Reference to the listening socket structure * addr Receives the address of the connecting client * addrlen Input: allocated size of 'addr', Return: returned size of 'addr' * newsock Location to return the accepted socket information. * * Returned Value: * Returns 0 (OK) on success. On failure, it returns a negated errno * value. See accept() for a desrciption of the appropriate error value. * * Assumptions: * The network is locked. * ****************************************************************************/ static int icmp_accept(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen, FAR struct socket *newsock) { return -EAFNOSUPPORT; } /**************************************************************************** * Name: icmp_bind * * Description: * icmp_bind() gives the socket 'psock' the local address 'addr'. 'addr' * is 'addrlen' bytes long. Traditionally, this is called "assigning a * name to a socket." When a socket is created with socket(), it exists * in a name space (address family) but has no name assigned. * * Input Parameters: * psock Socket structure of the socket to bind * addr Socket local address * addrlen Length of 'addr' * * Returned Value: * 0 on success; A negated errno value is returned on failure. See * bind() for a list a appropriate error values. * ****************************************************************************/ static int icmp_bind(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen) { /* An ICMP socket cannot be bound to a local address */ return -EBADF; } /**************************************************************************** * Name: icmp_getsockname * * Description: * The icmp_getsockname() function retrieves the locally-bound name of the * specified packet socket, stores this address in the sockaddr structure * pointed to by the 'addr' argument, and stores the length of this * address in the object pointed to by the 'addrlen' argument. * * If the actual length of the address is greater than the length of the * supplied sockaddr structure, the stored address will be truncated. * * If the socket has not been bound to a local name, the value stored in * the object pointed to by address is unspecified. * * Input Parameters: * psock Socket structure of the socket to be queried * addr sockaddr structure to receive data [out] * addrlen Length of sockaddr structure [in/out] * * Returned Value: * On success, 0 is returned, the 'addr' argument points to the address * of the socket, and the 'addrlen' argument points to the length of the * address. Otherwise, a negated errno value is returned. See * getsockname() for the list of appropriate error numbers. * ****************************************************************************/ static int icmp_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen) { return -EAFNOSUPPORT; } /**************************************************************************** * Name: icmp_getpeername * * Description: * The icmp_getpeername() function retrieves the remote-connected name of the * specified packet socket, stores this address in the sockaddr structure * pointed to by the 'addr' argument, and stores the length of this * address in the object pointed to by the 'addrlen' argument. * * If the actual length of the address is greater than the length of the * supplied sockaddr structure, the stored address will be truncated. * * If the socket has not been bound to a local name, the value stored in * the object pointed to by address is unspecified. * * Parameters: * psock Socket structure of the socket to be queried * addr sockaddr structure to receive data [out] * addrlen Length of sockaddr structure [in/out] * * Returned Value: * On success, 0 is returned, the 'addr' argument points to the address * of the socket, and the 'addrlen' argument points to the length of the * address. Otherwise, a negated errno value is returned. See * getpeername() for the list of appropriate error numbers. * ****************************************************************************/ static int icmp_getpeername(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen) { return -EAFNOSUPPORT; } /**************************************************************************** * Name: icmp_listen * * Description: * To accept connections, a socket is first created with psock_socket(), a * willingness to accept incoming connections and a queue limit for * incoming connections are specified with psock_listen(), and then the * connections are accepted with psock_accept(). For the case of raw * packet sockets, psock_listen() calls this function. The psock_listen() * call applies only to sockets of type SOCK_STREAM or SOCK_SEQPACKET. * * Input Parameters: * psock Reference to an internal, boound socket structure. * backlog The maximum length the queue of pending connections may grow. * If a connection request arrives with the queue full, the client * may receive an error with an indication of ECONNREFUSED or, * if the underlying protocol supports retransmission, the request * may be ignored so that retries succeed. * * Returned Value: * On success, zero is returned. On error, a negated errno value is * returned. See list() for the set of appropriate error values. * ****************************************************************************/ int icmp_listen(FAR struct socket *psock, int backlog) { return -EOPNOTSUPP; } /**************************************************************************** * Name: icmp_netpoll * * Description: * The standard poll() operation redirects operations on socket descriptors * to net_poll which, indiectly, calls to function. * * Input Parameters: * psock - An instance of the internal socket structure. * fds - The structure describing the events to be monitored, OR NULL if * this is a request to stop monitoring events. * setup - true: Setup up the poll; false: Teardown the poll * * Returned Value: * 0: Success; Negated errno on failure * ****************************************************************************/ static int icmp_netpoll(FAR struct socket *psock, FAR struct pollfd *fds, bool setup) { /* Check if we are setting up or tearing down the poll */ if (setup) { /* Perform the ICMP poll() setup */ return icmp_pollsetup(psock, fds); } else { /* Perform the ICMP poll() teardown */ return icmp_pollteardown(psock, fds); } } /**************************************************************************** * Name: icmp_send * * Description: * Socket send() method for the raw packet socket. * * Input Parameters: * psock An instance of the internal socket structure. * buf Data to send * len Length of data to send * flags Send flags * * Returned Value: * On success, returns the number of characters sent. On error, a negated * errno value is returned (see send() for the list of appropriate error * values. * ****************************************************************************/ static ssize_t icmp_send(FAR struct socket *psock, FAR const void *buf, size_t len, int flags) { /* ICMP sockets cannot be bound and, hence, cannot support any connection- * oriented data transfer. */ return -EDESTADDRREQ; } /**************************************************************************** * Name: icmp_close * * Description: * Performs the close operation on a raw packet socket instance * * Input Parameters: * psock Socket instance * * Returned Value: * 0 on success; a negated errno value is returned on any failure. * * Assumptions: * ****************************************************************************/ static int icmp_close(FAR struct socket *psock) { FAR struct icmp_conn_s *conn; DEBUGASSERT(psock != NULL && psock->s_conn != NULL); conn = psock->s_conn; /* Is this the last reference to the connection structure (there could be\ * more if the socket was dup'ed). */ DEBUGASSERT(conn->crefs > 0); if (conn->crefs <= 1) { /* Yes... free any read-ahead data */ iob_free_queue(&conn->readahead, IOBUSER_NET_SOCK_ICMP); /* Then free the connection structure */ conn->crefs = 0; /* No more references on the connection */ icmp_free(psock->s_conn); /* Free network resources */ } else { /* No.. Just decrement the reference count */ conn->crefs--; } return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ #endif /* CONFIG_NET_ICMP_SOCKET */