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nuttx/net/netdev/netdev_register.c

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/****************************************************************************
* net/netdev/netdev_register.c
*
* Copyright (C) 2007-2012, 2014-2015 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
#include <sys/socket.h>
#include <stdio.h>
#include <semaphore.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <net/if.h>
#include <net/ethernet.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/arp.h>
#include "utils/utils.h"
#include "igmp/igmp.h"
#include "netdev/netdev.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define NETDEV_ETH_FORMAT "eth%d"
#define NETDEV_LO_FORMAT "lo"
#define NETDEV_SLIP_FORMAT "sl%d"
#define NETDEV_TUN_FORMAT "tun%d"
#if defined(CONFIG_NET_SLIP)
# define NETDEV_DEFAULT_FORMAT NETDEV_SLIP_FORMAT
#elif defined(CONFIG_NET_ETHERNET)
# define NETDEV_DEFAULT_FORMAT NETDEV_ETH_FORMAT
#else /* if defined(CONFIG_NET_LOOPBACK) */
# define NETDEV_DEFAULT_FORMAT NETDEV_LO_FORMAT
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* Then next available device number */
#ifndef CONFIG_NET_MULTILINK
static int g_next_devnum = 0;
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/* List of registered Ethernet device drivers */
struct net_driver_s *g_netdevices = NULL;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: find_devnum
*
* Description:
* Given a device name format string, find the next device number for the
* class of device represented by that format string.
*
* Parameters:
* devfmt - The device format string
*
* Returned Value:
* The next device number for that device class
*
****************************************************************************/
#ifdef CONFIG_NET_MULTILINK
static int find_devnum(FAR const char *devfmt)
{
FAR struct net_driver_s *curr;
size_t fmt_size;
int result = 0;
fmt_size = strlen(devfmt);
/* Assumed that devfmt is xxx%d */
DEBUGASSERT(fmt_size > 2);
fmt_size -= 2;
/* Search the list of currently registered network devices */
for (curr = g_netdevices; curr; curr = curr->flink )
{
/* Does this device name match the format we were given? */
if (strncmp(curr->d_ifname, devfmt, fmt_size) == 0)
{
/* Yes.. increment the candidate device number */
result++;
}
}
/* Return this next device number for this format */
return result;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: netdev_register
*
* Description:
* Register a network device driver and assign a name to it so that it can
* be found in subsequent network ioctl operations on the device.
*
* Parameters:
* dev - The device driver structure to be registered.
* lltype - Link level protocol used by the driver (Ethernet, SLIP, TUN, ...
* ...
*
* Returned Value:
* 0:Success; negated errno on failure
*
* Assumptions:
* Called during system initialization from normal user mode
*
****************************************************************************/
int netdev_register(FAR struct net_driver_s *dev, enum net_lltype_e lltype)
{
FAR const char *devfmt;
#ifdef CONFIG_NET_USER_DEVFMT
FAR const char devfmt_str[IFNAMSIZ];
#endif
net_lock_t save;
int devnum;
if (dev)
{
#ifdef CONFIG_NET_MULTILINK
/* We are supporting multiple network devices and using different link
* level protocols. Set the protocol usd by the device and the size
* level protocols. Set the protocol used by the device and the size
* of the link header used by this protocol.
*/
switch (lltype)
{
#ifdef CONFIG_NET_LOOPBACK
case NET_LL_LOOPBACK: /* Local loopback */
dev->d_llhdrlen = 0;
dev->d_mtu = NET_LO_MTU;
#ifdef CONFIG_NET_TCP
dev->d_recvwndo = NET_LO_TCP_RECVWNDO;
#endif
devfmt = NETDEV_LO_FORMAT;
break;
#endif
#ifdef CONFIG_NET_ETHERNET
case NET_LL_ETHERNET: /* Ethernet */
dev->d_llhdrlen = ETH_HDRLEN;
dev->d_mtu = CONFIG_NET_ETH_MTU;
#ifdef CONFIG_NET_TCP
dev->d_recvwndo = CONFIG_NET_ETH_TCP_RECVWNDO;
#endif
devfmt = NETDEV_ETH_FORMAT;
break;
#endif
#ifdef CONFIG_NET_SLIP
case NET_LL_SLIP: /* Serial Line Internet Protocol (SLIP) */
dev->d_llhdrlen = 0;
dev->d_mtu = CONFIG_NET_SLIP_MTU;
#ifdef CONFIG_NET_TCP
dev->d_recvwndo = CONFIG_NET_SLIP_TCP_RECVWNDO;
#endif
devfmt = NETDEV_SLIP_FORMAT;
break;
#endif
#ifdef CONFIG_NET_TUN
case NET_LL_TUN: /* Virtual Network Device (TUN) */
dev->d_llhdrlen = 0;
dev->d_mtu = CONFIG_NET_TUN_MTU;
#ifdef CONFIG_NET_TCP
dev->d_recvwndo = CONFIG_NET_TUN_TCP_RECVWNDO;
#endif
devfmt = NETDEV_TUN_FORMAT;
break;
#endif
default:
nlldbg("ERROR: Unrecognized link type: %d\n", lltype);
return -EINVAL;
}
/* Remember the verified link type */
dev->d_lltype = (uint8_t)lltype;
#else
/* Use the default device name */
devfmt = NETDEV_DEFAULT_FORMAT;
#endif
/* There are no clients of the device yet */
dev->d_conncb = NULL;
dev->d_devcb = NULL;
/* Get the next available device number and sssign a device name to
* the interface
*/
save = net_lock();
#ifdef CONFIG_NET_MULTILINK
devnum = find_devnum(devfmt);
#else
devnum = g_next_devnum++;
#endif
#ifdef CONFIG_NET_USER_DEVFMT
if (*dev->d_ifname)
{
strncpy(devfmt_str, dev->d_ifname, IFNAMSIZ);
devfmt = devfmt_str;
}
#endif
snprintf(dev->d_ifname, IFNAMSIZ, devfmt, devnum );
/* Add the device to the list of known network devices */
dev->flink = g_netdevices;
g_netdevices = dev;
/* Configure the device for IGMP support */
#ifdef CONFIG_NET_IGMP
igmp_devinit(dev);
#endif
net_unlock(save);
#ifdef CONFIG_NET_ETHERNET
nlldbg("Registered MAC: %02x:%02x:%02x:%02x:%02x:%02x as dev: %s\n",
dev->d_mac.ether_addr_octet[0], dev->d_mac.ether_addr_octet[1],
dev->d_mac.ether_addr_octet[2], dev->d_mac.ether_addr_octet[3],
dev->d_mac.ether_addr_octet[4], dev->d_mac.ether_addr_octet[5],
dev->d_ifname);
#else
nlldbg("Registered dev: %s\n", dev->d_ifname);
#endif
return OK;
}
return -EINVAL;
}
#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */
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