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286 lines
8.2 KiB
286 lines
8.2 KiB
/**************************************************************************** |
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* net/socket.c |
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* |
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* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#ifdef CONFIG_NET |
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#include <sys/socket.h> |
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#include <errno.h> |
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#include <assert.h> |
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#include <debug.h> |
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#include "net_internal.h" |
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/**************************************************************************** |
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* Global Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Function: psock_socket |
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* |
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* Description: |
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* socket() creates an endpoint for communication and returns a socket |
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* structure. |
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* |
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* Parameters: |
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* domain (see sys/socket.h) |
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* type (see sys/socket.h) |
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* protocol (see sys/socket.h) |
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* psock A pointer to a user allocated socket structure to be initialized. |
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* |
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* Returned Value: |
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* 0 on success; -1 on error with errno set appropriately |
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* |
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* EACCES |
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* Permission to create a socket of the specified type and/or protocol |
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* is denied. |
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* EAFNOSUPPORT |
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* The implementation does not support the specified address family. |
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* EINVAL |
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* Unknown protocol, or protocol family not available. |
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* EMFILE |
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* Process file table overflow. |
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* ENFILE |
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* The system limit on the total number of open files has been reached. |
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* ENOBUFS or ENOMEM |
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* Insufficient memory is available. The socket cannot be created until |
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* sufficient resources are freed. |
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* EPROTONOSUPPORT |
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* The protocol type or the specified protocol is not supported within |
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* this domain. |
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* |
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* Assumptions: |
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* |
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****************************************************************************/ |
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int psock_socket(int domain, int type, int protocol, FAR struct socket *psock) |
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{ |
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int err = ENFILE; |
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/* Only PF_INET or PF_INET6 domains supported */ |
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#ifdef CONFIG_NET_IPv6 |
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if ( domain != PF_INET6) |
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#else |
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if ( domain != PF_INET) |
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#endif |
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{ |
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err = EAFNOSUPPORT; |
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goto errout; |
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} |
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/* Only SOCK_STREAM and possible SOCK_DRAM are supported */ |
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#if defined(CONFIG_NET_TCP) && defined(CONFIG_NET_UDP) |
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if ((type == SOCK_STREAM && protocol != 0 && protocol != IPPROTO_TCP) || |
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(type == SOCK_DGRAM && protocol != 0 && protocol != IPPROTO_UDP) || |
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(type != SOCK_STREAM && type != SOCK_DGRAM)) |
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#elif defined(CONFIG_NET_TCP) |
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if ((type == SOCK_STREAM && protocol != 0 && protocol != IPPROTO_TCP) || |
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(type != SOCK_STREAM)) |
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#elif defined(CONFIG_NET_UDP) |
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if ((type == SOCK_DGRAM && protocol != 0 && protocol != IPPROTO_UDP) || |
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(type != SOCK_DGRAM)) |
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#endif |
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{ |
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err = EPROTONOSUPPORT; |
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goto errout; |
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} |
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/* Everything looks good. Initialize the socket structure */ |
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/* Save the protocol type */ |
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psock->s_type = type; |
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psock->s_conn = NULL; |
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/* Allocate the appropriate connection structure. This reserves the |
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* the connection structure is is unallocated at this point. It will |
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* not actually be initialized until the socket is connected. |
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*/ |
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err = ENOMEM; /* Assume failure to allocate connection instance */ |
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switch (type) |
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{ |
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#ifdef CONFIG_NET_TCP |
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case SOCK_STREAM: |
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{ |
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/* Allocate the TCP connection structure and save in the new |
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* socket instance. |
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*/ |
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struct uip_conn *conn = uip_tcpalloc(); |
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if (conn) |
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{ |
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/* Set the reference count on the connection structure. This |
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* reference count will be increment only if the socket is |
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* dup'ed |
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*/ |
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DEBUGASSERT(conn->crefs == 0); |
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psock->s_conn = conn; |
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conn->crefs = 1; |
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} |
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} |
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break; |
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#endif |
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#ifdef CONFIG_NET_UDP |
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case SOCK_DGRAM: |
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{ |
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/* Allocate the UDP connection structure and save in the new |
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* socket instance. |
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*/ |
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struct uip_udp_conn *conn = uip_udpalloc(); |
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if (conn) |
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{ |
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/* Set the reference count on the connection structure. This |
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* reference count will be increment only if the socket is |
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* dup'ed |
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*/ |
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DEBUGASSERT(conn->crefs == 0); |
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psock->s_conn = conn; |
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conn->crefs = 1; |
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} |
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} |
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break; |
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#endif |
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default: |
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break; |
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} |
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/* Did we succesfully allocate some kind of connection structure? */ |
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if (!psock->s_conn) |
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{ |
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/* Failed to reserve a connection structure */ |
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goto errout; /* With err == ENFILE or ENOMEM */ |
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} |
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return OK; |
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errout: |
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errno = err; |
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return ERROR; |
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} |
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/**************************************************************************** |
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* Function: socket |
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* |
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* Description: |
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* socket() creates an endpoint for communication and returns a descriptor. |
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* |
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* Parameters: |
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* domain (see sys/socket.h) |
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* type (see sys/socket.h) |
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* protocol (see sys/socket.h) |
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* |
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* Returned Value: |
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* A non-negative socket descriptor on success; -1 on error with errno set |
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* appropriately. |
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* |
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* EACCES |
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* Permission to create a socket of the specified type and/or protocol |
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* is denied. |
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* EAFNOSUPPORT |
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* The implementation does not support the specified address family. |
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* EINVAL |
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* Unknown protocol, or protocol family not available. |
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* EMFILE |
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* Process file table overflow. |
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* ENFILE |
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* The system limit on the total number of open files has been reached. |
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* ENOBUFS or ENOMEM |
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* Insufficient memory is available. The socket cannot be created until |
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* sufficient resources are freed. |
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* EPROTONOSUPPORT |
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* The protocol type or the specified protocol is not supported within |
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* this domain. |
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* |
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* Assumptions: |
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* |
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****************************************************************************/ |
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int socket(int domain, int type, int protocol) |
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{ |
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FAR struct socket *psock; |
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int sockfd; |
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int ret; |
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/* Allocate a socket descriptor */ |
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sockfd = sockfd_allocate(0); |
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if (sockfd < 0) |
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{ |
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set_errno(ENFILE); |
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return ERROR; |
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} |
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/* Get the underlying socket structure */ |
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psock = sockfd_socket(sockfd); |
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if (!psock) |
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{ |
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set_errno(ENOSYS); /* should not happen */ |
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goto errout; |
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} |
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/* Initialize the socket structure */ |
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ret = psock_socket(domain, type, protocol, psock); |
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if (ret < 0) |
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{ |
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/* Error already set by psock_socket() */ |
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goto errout; |
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} |
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return sockfd; |
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errout: |
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sockfd_release(sockfd); |
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return ERROR; |
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} |
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#endif /* CONFIG_NET */ |
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