nuttx/include/net/if.h

/*******************************************************************************************
 * include/net/if.h
 *
 *   Copyright (C) 2007, 2008, 2012, 2015 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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.
 *
 *******************************************************************************************/

#ifndef __INCLUDE_NET_IF_H
#define __INCLUDE_NET_IF_H

/*******************************************************************************************
 * Included Files
 *******************************************************************************************/

#include <signal.h>
#include <sys/socket.h>

/*******************************************************************************************
 * Pre-processor Definitions
 *******************************************************************************************/

/* Sizing parameters */

#define IFNAMSIZ           16  /* Older naming standard */
#define IF_NAMESIZE        16  /* Newer naming standard */
#define IFHWADDRLEN        6

/* Interface flag bits */

#define IFF_DOWN           (1 << 0) /* Interface is down */
#define IFF_UP             (1 << 1) /* Interface is up */
#define IFF_RUNNING        (1 << 2) /* Carrier is available */
#define IFF_IPv6           (1 << 3) /* Configured for IPv6 packet (vs ARP or IPv4) */
#define IFF_NOARP          (1 << 7) /* ARP is not required for this packet */

/* Interface flag helpers */

#define IFF_SET_DOWN(f)    do { (f) |= IFF_DOWN; } while (0)
#define IFF_SET_UP(f)      do { (f) |= IFF_UP; } while (0)
#define IFF_SET_RUNNING(f) do { (f) |= IFF_RUNNING; } while (0)
#define IFF_SET_NOARP(f)   do { (f) |= IFF_NOARP; } while (0)

#define IFF_CLR_DOWN(f)    do { (f) &= ~IFF_DOWN; } while (0)
#define IFF_CLR_UP(f)      do { (f) &= ~IFF_UP; } while (0)
#define IFF_CLR_RUNNING(f) do { (f) &= ~IFF_RUNNING; } while (0)
#define IFF_CLR_NOARP(f)   do { (f) &= ~IFF_NOARP; } while (0)

#define IFF_IS_DOWN(f)     (((f) & IFF_DOWN) != 0)
#define IFF_IS_UP(f)       (((f) & IFF_UP) != 0)
#define IFF_IS_RUNNING(f)  (((f) & IFF_RUNNING) != 0)
#define IFF_IS_NOARP(f)    (((f) & IFF_NOARP) != 0)

/* We only need to manage the IPv6 bit if both IPv6 and IPv4 are supported.  Otherwise,
 * we can save a few bytes by ignoring it.
 */

#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
#  define IFF_SET_IPv6(f)  do { (f) |= IFF_IPv6; } while (0)
#  define IFF_CLR_IPv6(f)  do { (f) &= ~IFF_IPv6; } while (0)
#  define IFF_IS_IPv6(f)   (((f) & IFF_IPv6) != 0)

#  define IFF_SET_IPv4(f)  IFF_CLR_IPv6(f)
#  define IFF_CLR_IPv4(f)  IFF_SET_IPv6(f)
#  define IFF_IS_IPv4(f)   (!IFF_IS_IPv6(f))

#elif defined(CONFIG_NET_IPv6)
#  define IFF_SET_IPv6(f)
#  define IFF_CLR_IPv6(f)
#  define IFF_IS_IPv6(f)   (1)

#  define IFF_SET_IPv4(f)
#  define IFF_CLR_IPv4(f)
#  define IFF_IS_IPv4(f)   (0)

#else /* if defined(CONFIG_NET_IPv4) */
#  define IFF_SET_IPv6(f)
#  define IFF_CLR_IPv6(f)
#  define IFF_IS_IPv6(f)   (0)

#  define IFF_SET_IPv4(f)
#  define IFF_CLR_IPv4(f)
#  define IFF_IS_IPv4(f)   (1)
#endif

/*******************************************************************************************
 * Public Type Definitions
 *******************************************************************************************/

/* Structure passed with the SIOCMIINOTIFY ioctl command to enable notification of
 * of PHY state changes.
 */

struct mii_ioctl_notify_s
{
  pid_t pid;             /* PID of the task to receive the signal.  Zero means "this task" */
  struct sigevent event; /* Describe the way a task is to be notified */
};

/* Structure passed to read from or write to the MII/PHY management interface via the
 * SIOCxMIIREG ioctl commands.
 */

struct mii_ioctl_data_s
{
  uint16_t phy_id;      /* PHY device address */
  uint16_t reg_num;     /* PHY register address */
  uint16_t val_in;      /* PHY input data */
  uint16_t val_out;     /* PHY output data */
};

/* There are two forms of the I/F request structure.  One for IPv6 and one for IPv4.
 * Notice that they are (and must be) cast compatible and really different only
 * in the size of the structure allocation.
 *
 * This is the I/F request that should be used with IPv6.
 */

struct lifreq
{
  char                        lifr_name[IFNAMSIZ];      /* Network device name (e.g. "eth0") */
  union
  {
    struct sockaddr_storage   lifru_addr;               /* IP Address */
    struct sockaddr_storage   lifru_dstaddr;            /* P-to-P Address */
    struct sockaddr_storage   lifru_broadaddr;          /* Broadcast address */
    struct sockaddr_storage   lifru_netmask;            /* Netmask */
    struct sockaddr           lifru_hwaddr;             /* MAC address */
    int                       lifru_count;              /* Number of devices */
    int                       lifru_mtu;                /* MTU size */
    uint8_t                   lifru_flags;              /* Interface flags */
    struct mii_ioctl_notify_s llfru_mii_notify;         /* PHY event notification */
    struct mii_ioctl_data_s   lifru_mii_data;           /* MII request data */
  } lifr_ifru;
};

#define lifr_addr             lifr_ifru.lifru_addr      /* IP address */
#define lifr_dstaddr          lifr_ifru.lifru_dstaddr   /* P-to-P Address */
#define lifr_broadaddr        lifr_ifru.lifru_broadaddr /* Broadcast address */
#define lifr_netmask          lifr_ifru.lifru_netmask   /* Interface net mask */
#define lifr_hwaddr           lifr_ifru.lifru_hwaddr    /* MAC address */
#define lifr_mtu              lifr_ifru.lifru_mtu       /* MTU */
#define lifr_count            lifr_ifru.lifru_count     /* Number of devices */
#define lifr_flags            lifr_ifru.lifru_flags     /* interface flags */
#define lifr_mii_notify_pid   lifr_ifru.llfru_mii_notify.pid   /* PID to be notified */
#define lifr_mii_notify_event lifr_ifru.llfru_mii_notify.event /* Describes notification */
#define lifr_mii_phy_id       lifr_ifru.lifru_mii_data.phy_id  /* PHY device address */
#define lifr_mii_reg_num      lifr_ifru.lifru_mii_data.reg_num /* PHY register address */
#define lifr_mii_val_in       lifr_ifru.lifru_mii_data.val_in  /* PHY input data */
#define lifr_mii_val_out      lifr_ifru.lifru_mii_data.val_out /* PHY output data */

/* Used only with the SIOCGLIFCONF IOCTL commnd */

struct lifconf
{
  size_t                      lifc_len;                 /* Size of buffer */
  union
  {
    FAR char                 *lifcu_buf;                /* Buffer address */
    FAR struct lifreq        *lifcu_req;                /* Array of ifreq structures */
  } lifc_ifcu;
};

#define lifc_buf              lifc_ifcu.lifcu_buf       /* Buffer address */
#define lifc_req              lifc_ifcu.lifcu_req       /* Array of ifreq structures */

/* This is the I/F request that should be used with IPv4. */

struct ifreq
{
  char                        ifr_name[IFNAMSIZ];       /* Network device name (e.g. "eth0") */
  union
  {
    struct sockaddr           ifru_addr;                /* IP Address */
    struct sockaddr           ifru_dstaddr;             /* P-to-P Address */
    struct sockaddr           ifru_broadaddr;           /* Broadcast address */
    struct sockaddr           ifru_netmask;             /* Netmask */
    struct sockaddr           ifru_hwaddr;              /* MAC address */
    int                       ifru_count;               /* Number of devices */
    int                       ifru_mtu;                 /* MTU size */
    uint8_t                   ifru_flags;               /* Interface flags */
    struct mii_ioctl_notify_s ifru_mii_notify;          /* PHY event notification */
    struct mii_ioctl_data_s   ifru_mii_data;            /* MII request data */
  } ifr_ifru;
};

#define ifr_addr              ifr_ifru.ifru_addr        /* IP address */
#define ifr_dstaddr           ifr_ifru.ifru_dstaddr     /* P-to-P Address */
#define ifr_broadaddr         ifr_ifru.ifru_broadaddr   /* Broadcast address */
#define ifr_netmask           ifr_ifru.ifru_netmask     /* Interface net mask */
#define ifr_hwaddr            ifr_ifru.ifru_hwaddr      /* MAC address */
#define ifr_mtu               ifr_ifru.ifru_mtu         /* MTU */
#define ifr_count             ifr_ifru.ifru_count       /* Number of devices */
#define ifr_flags             ifr_ifru.ifru_flags       /* interface flags */
#define ifr_mii_notify_pid    ifr_ifru.ifru_mii_notify.pid   /* PID to be notified */
#define ifr_mii_notify_event  ifr_ifru.ifru_mii_notify.event /* Describes notification */
#define ifr_mii_phy_id        ifr_ifru.ifru_mii_data.phy_id  /* PHY device address */
#define ifr_mii_reg_num       ifr_ifru.ifru_mii_data.reg_num /* PHY register address */
#define ifr_mii_val_in        ifr_ifru.ifru_mii_data.val_in  /* PHY input data */
#define ifr_mii_val_out       ifr_ifru.ifru_mii_data.val_out /* PHY output data */

/* Used only with the SIOCGIFCONF IOCTL commnd*/

struct ifconf
{
  size_t                      ifc_len;                   /* Size of buffer */
  union
  {
    FAR char                 *ifcu_buf;                 /* Buffer address */
    FAR struct ifreq         *ifcu_req;                 /* Array of ifreq structures */
  } ifc_ifcu;
};

#define ifc_buf              ifc_ifcu.ifcu_buf          /* Buffer address */
#define ifc_req              ifc_ifcu.ifcu_req          /* Array of ifreq structures */

/*******************************************************************************************
 * Public Function Prototypes
 *******************************************************************************************/

#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif

/*******************************************************************************************
 * Name: if_nametoindex
 *
 * Description:
 *   The if_nametoindex() function returns the interface index corresponding to name ifname.
 *
 * Input Parameters:
 *   ifname - The interface name
 *
 * Returned Value:
 *   The corresponding index if ifname is the name of an interface; otherwise, zero.
 *
 *******************************************************************************************/

unsigned int if_nametoindex(FAR const char *ifname);

/*******************************************************************************************
 * Name: if_indextoname
 *
 * Description:
 *   The if_indextoname() function maps an interface index to its corresponding name.
 *
 * Input Parameters:
 *   ifname  - Points to a buffer of at least IF_NAMESIZE bytes.  if_indextoname() will
 *             place in this buffer the name of the interface with index ifindex.
 *
 * Returned Value:
 *   If ifindex is an interface index, then the function will return the value supplied by
 *   ifname. Otherwise, the function returns a NULL pointer and sets errno to indicate the
 *   error.
 *
 *******************************************************************************************/

FAR char *if_indextoname(unsigned int ifindex, FAR char *ifname);

#undef EXTERN
#ifdef __cplusplus
}
#endif

#endif /* __INCLUDE_NET_IF_H */