minix/lib/liblwip/dist/src/api/netifapi.c

   1 /**
   2  * @file
   3  * Network Interface Sequential API module
   4  *
   5  * @defgroup netifapi NETIF API
   6  * @ingroup sequential_api
   7  * Thread-safe functions to be called from non-TCPIP threads
   8  *
   9  * @defgroup netifapi_netif NETIF related
  10  * @ingroup netifapi
  11  * To be called from non-TCPIP threads
  12  */
  13
  14 /*
  15  * Redistribution and use in source and binary forms, with or without modification,
  16  * are permitted provided that the following conditions are met:
  17  *
  18  * 1. Redistributions of source code must retain the above copyright notice,
  19  *    this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright notice,
  21  *    this list of conditions and the following disclaimer in the documentation
  22  *    and/or other materials provided with the distribution.
  23  * 3. The name of the author may not be used to endorse or promote products
  24  *    derived from this software without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  27  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  28  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  29  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  30  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  31  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  34  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  35  * OF SUCH DAMAGE.
  36  *
  37  * This file is part of the lwIP TCP/IP stack.
  38  *
  39  */
  40
  41 #include "lwip/opt.h"
  42
  43 #if LWIP_NETIF_API /* don't build if not configured for use in lwipopts.h */
  44
  45 #include "lwip/netifapi.h"
  46 #include "lwip/memp.h"
  47 #include "lwip/priv/tcpip_priv.h"
  48
  49 #include <string.h> /* strncpy */
  50
  51 #define NETIFAPI_VAR_REF(name)      API_VAR_REF(name)
  52 #define NETIFAPI_VAR_DECLARE(name)  API_VAR_DECLARE(struct netifapi_msg, name)
  53 #define NETIFAPI_VAR_ALLOC(name)    API_VAR_ALLOC(struct netifapi_msg, MEMP_NETIFAPI_MSG, name, ERR_MEM)
  54 #define NETIFAPI_VAR_FREE(name)     API_VAR_FREE(MEMP_NETIFAPI_MSG, name)
  55
  56 /**
  57  * Call netif_add() inside the tcpip_thread context.
  58  */
  59 static err_t
  60 netifapi_do_netif_add(struct tcpip_api_call_data *m)
  61 {
  62   /* cast through void* to silence alignment warnings.
  63    * We know it works because the structs have been instantiated as struct netifapi_msg */
  64   struct netifapi_msg *msg = (struct netifapi_msg*)(void*)m;
  65
  66   if (!netif_add( msg->netif,
  67 #if LWIP_IPV4
  68                   API_EXPR_REF(msg->msg.add.ipaddr),
  69                   API_EXPR_REF(msg->msg.add.netmask),
  70                   API_EXPR_REF(msg->msg.add.gw),
  71 #endif /* LWIP_IPV4 */
  72                   msg->msg.add.state,
  73                   msg->msg.add.init,
  74                   msg->msg.add.input)) {
  75     return ERR_IF;
  76   } else {
  77     return ERR_OK;
  78   }
  79 }
  80
  81 #if LWIP_IPV4
  82 /**
  83  * Call netif_set_addr() inside the tcpip_thread context.
  84  */
  85 static err_t
  86 netifapi_do_netif_set_addr(struct tcpip_api_call_data *m)
  87 {
  88   /* cast through void* to silence alignment warnings.
  89    * We know it works because the structs have been instantiated as struct netifapi_msg */
  90   struct netifapi_msg *msg = (struct netifapi_msg*)(void*)m;
  91
  92   netif_set_addr( msg->netif,
  93                   API_EXPR_REF(msg->msg.add.ipaddr),
  94                   API_EXPR_REF(msg->msg.add.netmask),
  95                   API_EXPR_REF(msg->msg.add.gw));
  96   return ERR_OK;
  97 }
  98 #endif /* LWIP_IPV4 */
  99
 100 /**
 101 * Call netif_name_to_index() inside the tcpip_thread context.
 102 */
 103 static err_t
 104 netifapi_do_name_to_index(struct tcpip_api_call_data *m)
 105 {
 106   /* cast through void* to silence alignment warnings.
 107    * We know it works because the structs have been instantiated as struct netifapi_msg */
 108   struct netifapi_msg *msg = (struct netifapi_msg*)(void*)m;
 109
 110   msg->msg.ifs.index = netif_name_to_index(msg->msg.ifs.name);
 111   return ERR_OK;
 112 }
 113
 114 /**
 115 * Call netif_index_to_name() inside the tcpip_thread context.
 116 */
 117 static err_t
 118 netifapi_do_index_to_name(struct tcpip_api_call_data *m)
 119 {
 120   /* cast through void* to silence alignment warnings.
 121    * We know it works because the structs have been instantiated as struct netifapi_msg */
 122   struct netifapi_msg *msg = (struct netifapi_msg*)(void*)m;
 123
 124   if (!netif_index_to_name(msg->msg.ifs.index, msg->msg.ifs.name)) {
 125     /* return failure via empty name */
 126     msg->msg.ifs.name[0] = '\0';
 127   }
 128   return ERR_OK;
 129 }
 130
 131 /**
 132  * Call the "errtfunc" (or the "voidfunc" if "errtfunc" is NULL) inside the
 133  * tcpip_thread context.
 134  */
 135 static err_t
 136 netifapi_do_netif_common(struct tcpip_api_call_data *m)
 137 {
 138   /* cast through void* to silence alignment warnings.
 139    * We know it works because the structs have been instantiated as struct netifapi_msg */
 140   struct netifapi_msg *msg = (struct netifapi_msg*)(void*)m;
 141
 142   if (msg->msg.common.errtfunc != NULL) {
 143     return msg->msg.common.errtfunc(msg->netif);
 144   } else {
 145     msg->msg.common.voidfunc(msg->netif);
 146     return ERR_OK;
 147   }
 148 }
 149
 150 /**
 151  * @ingroup netifapi_netif
 152  * Call netif_add() in a thread-safe way by running that function inside the
 153  * tcpip_thread context.
 154  *
 155  * @note for params @see netif_add()
 156  */
 157 err_t
 158 netifapi_netif_add(struct netif *netif,
 159 #if LWIP_IPV4
 160                    const ip4_addr_t *ipaddr, const ip4_addr_t *netmask, const ip4_addr_t *gw,
 161 #endif /* LWIP_IPV4 */
 162                    void *state, netif_init_fn init, netif_input_fn input)
 163 {
 164   err_t err;
 165   NETIFAPI_VAR_DECLARE(msg);
 166   NETIFAPI_VAR_ALLOC(msg);
 167
 168 #if LWIP_IPV4
 169   if (ipaddr == NULL) {
 170     ipaddr = IP4_ADDR_ANY4;
 171   }
 172   if (netmask == NULL) {
 173     netmask = IP4_ADDR_ANY4;
 174   }
 175   if (gw == NULL) {
 176     gw = IP4_ADDR_ANY4;
 177   }
 178 #endif /* LWIP_IPV4 */
 179
 180   NETIFAPI_VAR_REF(msg).netif = netif;
 181 #if LWIP_IPV4
 182   NETIFAPI_VAR_REF(msg).msg.add.ipaddr  = NETIFAPI_VAR_REF(ipaddr);
 183   NETIFAPI_VAR_REF(msg).msg.add.netmask = NETIFAPI_VAR_REF(netmask);
 184   NETIFAPI_VAR_REF(msg).msg.add.gw      = NETIFAPI_VAR_REF(gw);
 185 #endif /* LWIP_IPV4 */
 186   NETIFAPI_VAR_REF(msg).msg.add.state   = state;
 187   NETIFAPI_VAR_REF(msg).msg.add.init    = init;
 188   NETIFAPI_VAR_REF(msg).msg.add.input   = input;
 189   err = tcpip_api_call(netifapi_do_netif_add, &API_VAR_REF(msg).call);
 190   NETIFAPI_VAR_FREE(msg);
 191   return err;
 192 }
 193
 194 #if LWIP_IPV4
 195 /**
 196  * @ingroup netifapi_netif
 197  * Call netif_set_addr() in a thread-safe way by running that function inside the
 198  * tcpip_thread context.
 199  *
 200  * @note for params @see netif_set_addr()
 201  */
 202 err_t
 203 netifapi_netif_set_addr(struct netif *netif,
 204                         const ip4_addr_t *ipaddr,
 205                         const ip4_addr_t *netmask,
 206                         const ip4_addr_t *gw)
 207 {
 208   err_t err;
 209   NETIFAPI_VAR_DECLARE(msg);
 210   NETIFAPI_VAR_ALLOC(msg);
 211
 212   if (ipaddr == NULL) {
 213     ipaddr = IP4_ADDR_ANY4;
 214   }
 215   if (netmask == NULL) {
 216     netmask = IP4_ADDR_ANY4;
 217   }
 218   if (gw == NULL) {
 219     gw = IP4_ADDR_ANY4;
 220   }
 221
 222   NETIFAPI_VAR_REF(msg).netif = netif;
 223   NETIFAPI_VAR_REF(msg).msg.add.ipaddr  = NETIFAPI_VAR_REF(ipaddr);
 224   NETIFAPI_VAR_REF(msg).msg.add.netmask = NETIFAPI_VAR_REF(netmask);
 225   NETIFAPI_VAR_REF(msg).msg.add.gw      = NETIFAPI_VAR_REF(gw);
 226   err = tcpip_api_call(netifapi_do_netif_set_addr, &API_VAR_REF(msg).call);
 227   NETIFAPI_VAR_FREE(msg);
 228   return err;
 229 }
 230 #endif /* LWIP_IPV4 */
 231
 232 /**
 233  * call the "errtfunc" (or the "voidfunc" if "errtfunc" is NULL) in a thread-safe
 234  * way by running that function inside the tcpip_thread context.
 235  *
 236  * @note use only for functions where there is only "netif" parameter.
 237  */
 238 err_t
 239 netifapi_netif_common(struct netif *netif, netifapi_void_fn voidfunc,
 240                        netifapi_errt_fn errtfunc)
 241 {
 242   err_t err;
 243   NETIFAPI_VAR_DECLARE(msg);
 244   NETIFAPI_VAR_ALLOC(msg);
 245
 246   NETIFAPI_VAR_REF(msg).netif = netif;
 247   NETIFAPI_VAR_REF(msg).msg.common.voidfunc = voidfunc;
 248   NETIFAPI_VAR_REF(msg).msg.common.errtfunc = errtfunc;
 249   err = tcpip_api_call(netifapi_do_netif_common, &API_VAR_REF(msg).call);
 250   NETIFAPI_VAR_FREE(msg);
 251   return err;
 252 }
 253
 254 /**
 255 * @ingroup netifapi_netif
 256 * Call netif_name_to_index() in a thread-safe way by running that function inside the
 257 * tcpip_thread context.
 258 *
 259 * @param name the interface name of the netif
 260 * @param idx output index of the found netif
 261 */
 262 err_t
 263 netifapi_netif_name_to_index(const char *name, u8_t *idx)
 264 {
 265   err_t err;
 266   NETIFAPI_VAR_DECLARE(msg);
 267   NETIFAPI_VAR_ALLOC(msg);
 268
 269   *idx = 0;
 270
 271 #if LWIP_MPU_COMPATIBLE
 272   strncpy(NETIFAPI_VAR_REF(msg).msg.ifs.name, name, NETIF_NAMESIZE - 1);
 273   NETIFAPI_VAR_REF(msg).msg.ifs.name[NETIF_NAMESIZE - 1] = '\0';
 274 #else
 275   NETIFAPI_VAR_REF(msg).msg.ifs.name = LWIP_CONST_CAST(char*, name);
 276 #endif /* LWIP_MPU_COMPATIBLE */
 277   err = tcpip_api_call(netifapi_do_name_to_index, &API_VAR_REF(msg).call);
 278   if (!err) {
 279     *idx = NETIFAPI_VAR_REF(msg).msg.ifs.index;
 280   }
 281   NETIFAPI_VAR_FREE(msg);
 282   return err;
 283 }
 284
 285 /**
 286 * @ingroup netifapi_netif
 287 * Call netif_index_to_name() in a thread-safe way by running that function inside the
 288 * tcpip_thread context.
 289 *
 290 * @param idx the interface index of the netif
 291 * @param name output name of the found netif, empty '\0' string if netif not found.
 292 *             name should be of at least NETIF_NAMESIZE bytes
 293 */
 294 err_t
 295 netifapi_netif_index_to_name(u8_t idx, char *name)
 296 {
 297   err_t err;
 298   NETIFAPI_VAR_DECLARE(msg);
 299   NETIFAPI_VAR_ALLOC(msg);
 300
 301   NETIFAPI_VAR_REF(msg).msg.ifs.index = idx;
 302 #if !LWIP_MPU_COMPATIBLE
 303   NETIFAPI_VAR_REF(msg).msg.ifs.name = name;
 304 #endif /* LWIP_MPU_COMPATIBLE */
 305   err = tcpip_api_call(netifapi_do_index_to_name, &API_VAR_REF(msg).call);
 306 #if LWIP_MPU_COMPATIBLE
 307   if (!err) {
 308     strncpy(name, NETIFAPI_VAR_REF(msg).msg.ifs.name, NETIF_NAMESIZE - 1);
 309     name[NETIF_NAMESIZE - 1] = '\0';
 310   }
 311 #endif /* LWIP_MPU_COMPATIBLE */
 312   NETIFAPI_VAR_FREE(msg);
 313   return err;
 314 }
 315
 316 #endif /* LWIP_NETIF_API */