lib/liblwip/include/lwip/netif.h

   1 /*
   2  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without modification,
   6  * are permitted provided that the following conditions are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright notice,
   9  *    this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright notice,
  11  *    this list of conditions and the following disclaimer in the documentation
  12  *    and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  19  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  21  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  24  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  25  * OF SUCH DAMAGE.
  26  *
  27  * This file is part of the lwIP TCP/IP stack.
  28  *
  29  * Author: Adam Dunkels <adam@sics.se>
  30  *
  31  */
  32 #ifndef __LWIP_NETIF_H__
  33 #define __LWIP_NETIF_H__
  34
  35 #include "lwip/opt.h"
  36
  37 #define ENABLE_LOOPBACK (LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF)
  38
  39 #include "lwip/err.h"
  40
  41 #include "lwip/ip_addr.h"
  42
  43 #include "lwip/def.h"
  44 #include "lwip/pbuf.h"
  45 #if LWIP_DHCP
  46 struct dhcp;
  47 #endif
  48 #if LWIP_AUTOIP
  49 struct autoip;
  50 #endif
  51
  52 #ifdef __cplusplus
  53 extern "C" {
  54 #endif
  55
  56 /* Throughout this file, IP addresses are expected to be in
  57  * the same byte order as in IP_PCB. */
  58
  59 /** must be the maximum of all used hardware address lengths
  60     across all types of interfaces in use */
  61 #define NETIF_MAX_HWADDR_LEN 6U
  62
  63 /** Whether the network interface is 'up'. This is
  64  * a software flag used to control whether this network
  65  * interface is enabled and processes traffic.
  66  * It is set by the startup code (for static IP configuration) or
  67  * by dhcp/autoip when an address has been assigned.
  68  */
  69 #define NETIF_FLAG_UP           0x01U
  70 /** If set, the netif has broadcast capability.
  71  * Set by the netif driver in its init function. */
  72 #define NETIF_FLAG_BROADCAST    0x02U
  73 /** If set, the netif is one end of a point-to-point connection.
  74  * Set by the netif driver in its init function. */
  75 #define NETIF_FLAG_POINTTOPOINT 0x04U
  76 /** If set, the interface is configured using DHCP.
  77  * Set by the DHCP code when starting or stopping DHCP. */
  78 #define NETIF_FLAG_DHCP         0x08U
  79 /** If set, the interface has an active link
  80  *  (set by the network interface driver).
  81  * Either set by the netif driver in its init function (if the link
  82  * is up at that time) or at a later point once the link comes up
  83  * (if link detection is supported by the hardware). */
  84 #define NETIF_FLAG_LINK_UP      0x10U
  85 /** If set, the netif is an ethernet device using ARP.
  86  * Set by the netif driver in its init function.
  87  * Used to check input packet types and use of DHCP. */
  88 #define NETIF_FLAG_ETHARP       0x20U
  89 /** If set, the netif is an ethernet device. It might not use
  90  * ARP or TCP/IP if it is used for PPPoE only.
  91  */
  92 #define NETIF_FLAG_ETHERNET     0x40U
  93 /** If set, the netif has IGMP capability.
  94  * Set by the netif driver in its init function. */
  95 #define NETIF_FLAG_IGMP         0x80U
  96
  97 /** Function prototype for netif init functions. Set up flags and output/linkoutput
  98  * callback functions in this function.
  99  *
 100  * @param netif The netif to initialize
 101  */
 102 typedef err_t (*netif_init_fn)(struct netif *netif);
 103 /** Function prototype for netif->input functions. This function is saved as 'input'
 104  * callback function in the netif struct. Call it when a packet has been received.
 105  *
 106  * @param p The received packet, copied into a pbuf
 107  * @param inp The netif which received the packet
 108  */
 109 typedef err_t (*netif_input_fn)(struct pbuf *p, struct netif *inp);
 110 /** Function prototype for netif->output functions. Called by lwIP when a packet
 111  * shall be sent. For ethernet netif, set this to 'etharp_output' and set
 112  * 'linkoutput'.
 113  *
 114  * @param netif The netif which shall send a packet
 115  * @param p The packet to send (p->payload points to IP header)
 116  * @param ipaddr The IP address to which the packet shall be sent
 117  */
 118 typedef err_t (*netif_output_fn)(struct netif *netif, struct pbuf *p,
 119        ip_addr_t *ipaddr);
 120 /** Function prototype for netif->linkoutput functions. Only used for ethernet
 121  * netifs. This function is called by ARP when a packet shall be sent.
 122  *
 123  * @param netif The netif which shall send a packet
 124  * @param p The packet to send (raw ethernet packet)
 125  */
 126 typedef err_t (*netif_linkoutput_fn)(struct netif *netif, struct pbuf *p);
 127 /** Function prototype for netif status- or link-callback functions. */
 128 typedef void (*netif_status_callback_fn)(struct netif *netif);
 129 /** Function prototype for netif igmp_mac_filter functions */
 130 typedef err_t (*netif_igmp_mac_filter_fn)(struct netif *netif,
 131        ip_addr_t *group, u8_t action);
 132
 133 /** Generic data structure used for all lwIP network interfaces.
 134  *  The following fields should be filled in by the initialization
 135  *  function for the device driver: hwaddr_len, hwaddr[], mtu, flags */
 136 struct netif {
 137   /** pointer to next in linked list */
 138   struct netif *next;
 139
 140   /** IP address configuration in network byte order */
 141   ip_addr_t ip_addr;
 142   ip_addr_t netmask;
 143   ip_addr_t gw;
 144
 145   /** This function is called by the network device driver
 146    *  to pass a packet up the TCP/IP stack. */
 147   netif_input_fn input;
 148   /** This function is called by the IP module when it wants
 149    *  to send a packet on the interface. This function typically
 150    *  first resolves the hardware address, then sends the packet. */
 151   netif_output_fn output;
 152   /** This function is called by the ARP module when it wants
 153    *  to send a packet on the interface. This function outputs
 154    *  the pbuf as-is on the link medium. */
 155   netif_linkoutput_fn linkoutput;
 156 #if LWIP_NETIF_STATUS_CALLBACK
 157   /** This function is called when the netif state is set to up or down
 158    */
 159   netif_status_callback_fn status_callback;
 160 #endif /* LWIP_NETIF_STATUS_CALLBACK */
 161 #if LWIP_NETIF_LINK_CALLBACK
 162   /** This function is called when the netif link is set to up or down
 163    */
 164   netif_status_callback_fn link_callback;
 165 #endif /* LWIP_NETIF_LINK_CALLBACK */
 166   /** This field can be set by the device driver and could point
 167    *  to state information for the device. */
 168   void *state;
 169 #if LWIP_DHCP
 170   /** the DHCP client state information for this netif */
 171   struct dhcp *dhcp;
 172 #endif /* LWIP_DHCP */
 173 #if LWIP_AUTOIP
 174   /** the AutoIP client state information for this netif */
 175   struct autoip *autoip;
 176 #endif
 177 #if LWIP_NETIF_HOSTNAME
 178   /* the hostname for this netif, NULL is a valid value */
 179   char*  hostname;
 180 #endif /* LWIP_NETIF_HOSTNAME */
 181   /** maximum transfer unit (in bytes) */
 182   u16_t mtu;
 183   /** number of bytes used in hwaddr */
 184   u8_t hwaddr_len;
 185   /** link level hardware address of this interface */
 186   u8_t hwaddr[NETIF_MAX_HWADDR_LEN];
 187   /** flags (see NETIF_FLAG_ above) */
 188   u8_t flags;
 189   /** descriptive abbreviation */
 190   char name[2];
 191   /** number of this interface */
 192   u8_t num;
 193 #if LWIP_SNMP
 194   /** link type (from "snmp_ifType" enum from snmp.h) */
 195   u8_t link_type;
 196   /** (estimate) link speed */
 197   u32_t link_speed;
 198   /** timestamp at last change made (up/down) */
 199   u32_t ts;
 200   /** counters */
 201   u32_t ifinoctets;
 202   u32_t ifinucastpkts;
 203   u32_t ifinnucastpkts;
 204   u32_t ifindiscards;
 205   u32_t ifoutoctets;
 206   u32_t ifoutucastpkts;
 207   u32_t ifoutnucastpkts;
 208   u32_t ifoutdiscards;
 209 #endif /* LWIP_SNMP */
 210 #if LWIP_IGMP
 211   /** This function could be called to add or delete a entry in the multicast
 212       filter table of the ethernet MAC.*/
 213   netif_igmp_mac_filter_fn igmp_mac_filter;
 214 #endif /* LWIP_IGMP */
 215 #if LWIP_NETIF_HWADDRHINT
 216   u8_t *addr_hint;
 217 #endif /* LWIP_NETIF_HWADDRHINT */
 218 #if ENABLE_LOOPBACK
 219   /* List of packets to be queued for ourselves. */
 220   struct pbuf *loop_first;
 221   struct pbuf *loop_last;
 222 #if LWIP_LOOPBACK_MAX_PBUFS
 223   u16_t loop_cnt_current;
 224 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
 225 #endif /* ENABLE_LOOPBACK */
 226 };
 227
 228 #if LWIP_SNMP
 229 #define NETIF_INIT_SNMP(netif, type, speed) \
 230   /* use "snmp_ifType" enum from snmp.h for "type", snmp_ifType_ethernet_csmacd by example */ \
 231   (netif)->link_type = (type);    \
 232   /* your link speed here (units: bits per second) */  \
 233   (netif)->link_speed = (speed);  \
 234   (netif)->ts = 0;              \
 235   (netif)->ifinoctets = 0;      \
 236   (netif)->ifinucastpkts = 0;   \
 237   (netif)->ifinnucastpkts = 0;  \
 238   (netif)->ifindiscards = 0;    \
 239   (netif)->ifoutoctets = 0;     \
 240   (netif)->ifoutucastpkts = 0;  \
 241   (netif)->ifoutnucastpkts = 0; \
 242   (netif)->ifoutdiscards = 0
 243 #else /* LWIP_SNMP */
 244 #define NETIF_INIT_SNMP(netif, type, speed)
 245 #endif /* LWIP_SNMP */
 246
 247
 248 /** The list of network interfaces. */
 249 extern struct netif *netif_list;
 250 /** The default network interface. */
 251 extern struct netif *netif_default;
 252
 253 void netif_init(void);
 254
 255 struct netif *netif_add(struct netif *netif, ip_addr_t *ipaddr, ip_addr_t *netmask,
 256       ip_addr_t *gw, void *state, netif_init_fn init, netif_input_fn input);
 257
 258 void
 259 netif_set_addr(struct netif *netif, ip_addr_t *ipaddr, ip_addr_t *netmask,
 260       ip_addr_t *gw);
 261 void netif_remove(struct netif * netif);
 262
 263 /* Returns a network interface given its name. The name is of the form
 264    "et0", where the first two letters are the "name" field in the
 265    netif structure, and the digit is in the num field in the same
 266    structure. */
 267 struct netif *netif_find(char *name);
 268
 269 void netif_set_default(struct netif *netif);
 270
 271 void netif_set_ipaddr(struct netif *netif, ip_addr_t *ipaddr);
 272 void netif_set_netmask(struct netif *netif, ip_addr_t *netmask);
 273 void netif_set_gw(struct netif *netif, ip_addr_t *gw);
 274
 275 void netif_set_up(struct netif *netif);
 276 void netif_set_down(struct netif *netif);
 277 /** Ask if an interface is up */
 278 #define netif_is_up(netif) (((netif)->flags & NETIF_FLAG_UP) ? (u8_t)1 : (u8_t)0)
 279
 280 #if LWIP_NETIF_STATUS_CALLBACK
 281 void netif_set_status_callback(struct netif *netif, netif_status_callback_fn status_callback);
 282 #endif /* LWIP_NETIF_STATUS_CALLBACK */
 283
 284 void netif_set_link_up(struct netif *netif);
 285 void netif_set_link_down(struct netif *netif);
 286 /** Ask if a link is up */
 287 #define netif_is_link_up(netif) (((netif)->flags & NETIF_FLAG_LINK_UP) ? (u8_t)1 : (u8_t)0)
 288
 289 #if LWIP_NETIF_LINK_CALLBACK
 290 void netif_set_link_callback(struct netif *netif, netif_status_callback_fn link_callback);
 291 #endif /* LWIP_NETIF_LINK_CALLBACK */
 292
 293 #if LWIP_NETIF_HOSTNAME
 294 #define netif_set_hostname(netif, name) do { if((netif) != NULL) { (netif)->hostname = name; }}while(0)
 295 #define netif_get_hostname(netif) (((netif) != NULL) ? ((netif)->hostname) : NULL)
 296 #endif /* LWIP_NETIF_HOSTNAME */
 297
 298 #if LWIP_IGMP
 299 #define netif_set_igmp_mac_filter(netif, function) do { if((netif) != NULL) { (netif)->igmp_mac_filter = function; }}while(0)
 300 #define netif_get_igmp_mac_filter(netif) (((netif) != NULL) ? ((netif)->igmp_mac_filter) : NULL)
 301 #endif /* LWIP_IGMP */
 302
 303 #if ENABLE_LOOPBACK
 304 err_t netif_loop_output(struct netif *netif, struct pbuf *p, ip_addr_t *dest_ip);
 305 void netif_poll(struct netif *netif);
 306 #if !LWIP_NETIF_LOOPBACK_MULTITHREADING
 307 void netif_poll_all(void);
 308 #endif /* !LWIP_NETIF_LOOPBACK_MULTITHREADING */
 309 #endif /* ENABLE_LOOPBACK */
 310
 311 #ifdef __cplusplus
 312 }
 313 #endif
 314
 315 #endif /* __LWIP_NETIF_H__ */