[457] | 1 | /**
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| 2 | * @file
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| 3 | * Sockets API internal implementations (do not use in application code)
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2017 Joel Cunningham, Garmin International, Inc. <joel.cunningham@garmin.com>
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| 8 | * All rights reserved.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without modification,
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| 11 | * are permitted provided that the following conditions are met:
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| 12 | *
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| 13 | * 1. Redistributions of source code must retain the above copyright notice,
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| 14 | * this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 16 | * this list of conditions and the following disclaimer in the documentation
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| 17 | * and/or other materials provided with the distribution.
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| 18 | * 3. The name of the author may not be used to endorse or promote products
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| 19 | * derived from this software without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 30 | * OF SUCH DAMAGE.
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| 31 | *
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| 32 | * This file is part of the lwIP TCP/IP stack.
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| 33 | *
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| 34 | * Author: Joel Cunningham <joel.cunningham@me.com>
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| 35 | *
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| 36 | */
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| 37 | #ifndef LWIP_HDR_SOCKETS_PRIV_H
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| 38 | #define LWIP_HDR_SOCKETS_PRIV_H
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| 39 |
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| 40 | #include "lwip/opt.h"
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| 41 |
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| 42 | #if LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */
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| 43 |
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| 44 | #include "lwip/err.h"
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| 45 | #include "lwip/sockets.h"
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| 46 | #include "lwip/sys.h"
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| 47 |
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| 48 | #ifdef __cplusplus
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| 49 | extern "C" {
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| 50 | #endif
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| 51 |
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| 52 | #define NUM_SOCKETS MEMP_NUM_NETCONN
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| 53 |
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| 54 | /** This is overridable for the rare case where more than 255 threads
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| 55 | * select on the same socket...
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| 56 | */
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| 57 | #ifndef SELWAIT_T
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| 58 | #define SELWAIT_T u8_t
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| 59 | #endif
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| 60 |
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| 61 | union lwip_sock_lastdata {
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| 62 | struct netbuf *netbuf;
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| 63 | struct pbuf *pbuf;
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| 64 | };
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| 65 |
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| 66 | /** Contains all internal pointers and states used for a socket */
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| 67 | struct lwip_sock {
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| 68 | /** sockets currently are built on netconns, each socket has one netconn */
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| 69 | struct netconn *conn;
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| 70 | /** data that was left from the previous read */
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| 71 | union lwip_sock_lastdata lastdata;
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| 72 | #if LWIP_SOCKET_SELECT || LWIP_SOCKET_POLL
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| 73 | /** number of times data was received, set by event_callback(),
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| 74 | tested by the receive and select functions */
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| 75 | s16_t rcvevent;
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| 76 | /** number of times data was ACKed (free send buffer), set by event_callback(),
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| 77 | tested by select */
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| 78 | u16_t sendevent;
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| 79 | /** error happened for this socket, set by event_callback(), tested by select */
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| 80 | u16_t errevent;
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| 81 | /** counter of how many threads are waiting for this socket using select */
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| 82 | SELWAIT_T select_waiting;
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| 83 | #endif /* LWIP_SOCKET_SELECT || LWIP_SOCKET_POLL */
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| 84 | #if LWIP_NETCONN_FULLDUPLEX
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| 85 | /* counter of how many threads are using a struct lwip_sock (not the 'int') */
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| 86 | u8_t fd_used;
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| 87 | /* status of pending close/delete actions */
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| 88 | u8_t fd_free_pending;
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| 89 | #define LWIP_SOCK_FD_FREE_TCP 1
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| 90 | #define LWIP_SOCK_FD_FREE_FREE 2
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| 91 | #endif
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| 92 | };
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| 93 |
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| 94 | #ifndef set_errno
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| 95 | #define set_errno(err) do { if (err) { errno = (err); } } while(0)
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| 96 | #endif
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| 97 |
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| 98 | #if !LWIP_TCPIP_CORE_LOCKING
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| 99 | /** Maximum optlen used by setsockopt/getsockopt */
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| 100 | #define LWIP_SETGETSOCKOPT_MAXOPTLEN LWIP_MAX(16, sizeof(struct ifreq))
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| 101 |
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| 102 | /** This struct is used to pass data to the set/getsockopt_internal
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| 103 | * functions running in tcpip_thread context (only a void* is allowed) */
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| 104 | struct lwip_setgetsockopt_data {
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| 105 | /** socket index for which to change options */
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| 106 | int s;
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| 107 | /** level of the option to process */
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| 108 | int level;
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| 109 | /** name of the option to process */
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| 110 | int optname;
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| 111 | /** set: value to set the option to
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| 112 | * get: value of the option is stored here */
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| 113 | #if LWIP_MPU_COMPATIBLE
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| 114 | u8_t optval[LWIP_SETGETSOCKOPT_MAXOPTLEN];
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| 115 | #else
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| 116 | union {
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| 117 | void *p;
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| 118 | const void *pc;
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| 119 | } optval;
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| 120 | #endif
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| 121 | /** size of *optval */
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| 122 | socklen_t optlen;
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| 123 | /** if an error occurs, it is temporarily stored here */
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| 124 | int err;
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| 125 | /** semaphore to wake up the calling task */
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| 126 | void* completed_sem;
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| 127 | };
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| 128 | #endif /* !LWIP_TCPIP_CORE_LOCKING */
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| 129 |
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| 130 | #ifdef __cplusplus
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| 131 | }
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| 132 | #endif
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| 133 |
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| 134 | struct lwip_sock* lwip_socket_dbg_get_socket(int fd);
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| 135 |
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| 136 | #if LWIP_SOCKET_SELECT || LWIP_SOCKET_POLL
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| 137 |
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| 138 | #if LWIP_NETCONN_SEM_PER_THREAD
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| 139 | #define SELECT_SEM_T sys_sem_t*
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| 140 | #define SELECT_SEM_PTR(sem) (sem)
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| 141 | #else /* LWIP_NETCONN_SEM_PER_THREAD */
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| 142 | #define SELECT_SEM_T sys_sem_t
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| 143 | #define SELECT_SEM_PTR(sem) (&(sem))
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| 144 | #endif /* LWIP_NETCONN_SEM_PER_THREAD */
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| 145 |
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| 146 | /** Description for a task waiting in select */
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| 147 | struct lwip_select_cb {
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| 148 | /** Pointer to the next waiting task */
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| 149 | struct lwip_select_cb *next;
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| 150 | /** Pointer to the previous waiting task */
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| 151 | struct lwip_select_cb *prev;
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| 152 | #if LWIP_SOCKET_SELECT
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| 153 | /** readset passed to select */
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| 154 | fd_set *readset;
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| 155 | /** writeset passed to select */
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| 156 | fd_set *writeset;
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| 157 | /** unimplemented: exceptset passed to select */
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| 158 | fd_set *exceptset;
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| 159 | #endif /* LWIP_SOCKET_SELECT */
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| 160 | #if LWIP_SOCKET_POLL
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| 161 | /** fds passed to poll; NULL if select */
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| 162 | struct pollfd *poll_fds;
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| 163 | /** nfds passed to poll; 0 if select */
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| 164 | nfds_t poll_nfds;
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| 165 | #endif /* LWIP_SOCKET_POLL */
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| 166 | /** don't signal the same semaphore twice: set to 1 when signalled */
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| 167 | int sem_signalled;
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| 168 | /** semaphore to wake up a task waiting for select */
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| 169 | SELECT_SEM_T sem;
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| 170 | };
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| 171 | #endif /* LWIP_SOCKET_SELECT || LWIP_SOCKET_POLL */
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| 172 |
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| 173 | #endif /* LWIP_SOCKET */
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| 174 |
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| 175 | #endif /* LWIP_HDR_SOCKETS_PRIV_H */
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