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nuttx/net/netdev/netdev_ifconf.c

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/****************************************************************************
* net/netdev/netdev_ifconf.c
*
* Copyright (C) 2017 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>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <net/if.h>
#include <nuttx/net/netdev.h>
#include "inet/inet.h"
#include "utils/utils.h"
#include "netdev/netdev.h"
/****************************************************************************
* Private Types
****************************************************************************/
/* The form of information passed with netdev_foreach() callback */
#ifdef CONFIG_NET_IPv4
struct ifconf_ipv4_info_s
{
size_t bufsize;
FAR struct ifconf *ifc;
};
#endif
#ifdef CONFIG_NET_IPv6
struct ifconf_ipv6_info_s
{
size_t bufsize;
FAR struct lifconf *lifc;
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: ifconf_ipv4_callback
*
* Description:
* Callback from netdev_foreach() that does the real implementation of
* netdev_ipv4_ifconf().
*
* Input Parameters:
* dev - The network device for this callback.
* arg - User callback argument
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
static int ifconf_ipv4_callback(FAR struct net_driver_s *dev, FAR void *arg)
{
FAR struct ifconf_ipv4_info_s *info = (FAR struct ifconf_ipv4_info_s *)arg;
FAR struct ifconf *ifc;
DEBUGASSERT(dev != NULL && info != NULL && info->ifc != NULL);
ifc = info->ifc;
/* Check if this adapter has an IPv4 address assigned and is in the UP
* state.
*/
if (!net_ipv4addr_cmp(dev->d_ipaddr, INADDR_ANY) &&
(dev->d_flags & IFF_UP) != 0)
{
/* Check if we would exceed the buffer space provided by the caller.
* NOTE: A common usage model is:
*
* 1) Provide no buffer with the first SIOCGIFCONF command. In this
* case, only the size of the buffer needed for all of IPv4
* capable interface information is returned.
* 2) Allocate a buffer of that size
* 3) Then use the allocated buffer to receive all of the IPv4
* interface information on the second SIOCGIFCONF command.
*
* CAUTION: The number of IPv6 capable interface may change between
* calls. It is the callers responsibility to behave sanely in such
* cases.
*/
if (ifc->ifc_len + sizeof(struct ifreq) <= info->bufsize)
{
FAR struct ifreq *req =
(FAR struct ifreq *)&ifc->ifc_buf[ifc->ifc_len];
FAR struct sockaddr_in *inaddr =
(FAR struct sockaddr_in *)&req->ifr_addr;
/* There is space for information about another adapter. Within
* each ifreq structure, ifr_name will receive the interface name
* and ifr_addr the address. The actual number of bytes
* transferred is returned in ifc_len.
*/
strncpy(req->ifr_name, dev->d_ifname, IFNAMSIZ);
inaddr->sin_family = AF_INET;
inaddr->sin_port = 0;
net_ipv4addr_copy(inaddr->sin_addr.s_addr, dev->d_ipaddr);
memset(inaddr->sin_zero, 0, sizeof(inaddr->sin_zero));
}
/* Increment the size of the buffer in any event */
ifc->ifc_len += sizeof(struct ifreq);
}
return 0;
}
#endif
/****************************************************************************
* Name: ifconf_ipv6_callback
*
* Description:
* Callback from netdev_foreach() that does the real implementation of
* netdev_ipv6_ifconf().
*
* Input Parameters:
* dev - The network device for this callback.
* arg - User callback argument
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
static int ifconf_ipv6_callback(FAR struct net_driver_s *dev, FAR void *arg)
{
FAR struct ifconf_ipv6_info_s *info = (FAR struct ifconf_ipv6_info_s *)arg;
FAR struct lifconf *lifc;
DEBUGASSERT(dev != NULL && info != NULL && info->lifc != NULL);
lifc = info->lifc;
/* Check if this adapter has an IPv6 address assigned and is in the UP
* state.
*/
if (!net_ipv6addr_cmp(dev->d_ipv6addr, g_ipv6_unspecaddr) &&
(dev->d_flags & IFF_UP) != 0)
{
/* Check if we would exceed the buffer space provided by the caller.
* NOTE: A common usage model is:
*
* 1) Provide no buffer with the first SIOCGLIFCONF command. In this
* case, only the size of the buffer needed for all of IPv6
* capable interface information is returned.
* 2) Allocate a buffer of that size
* 3) Then use the allocated buffer to receive all of the IPv6
* interface information on the second SIOCGLIFCONF command.
*
* CAUTION: The number of IPv6 capable interface may change between
* calls. It is the callers responsibility to behave sanely in such
* cases.
*/
if (lifc->lifc_len + sizeof(struct lifreq) <= info->bufsize)
{
FAR struct lifreq *req =
(FAR struct lifreq *)&lifc->lifc_buf[lifc->lifc_len];
FAR struct sockaddr_in6 *inaddr =
(FAR struct sockaddr_in6 *)&req->lifr_addr;
/* There is space for information about another adapter. Within
* each ifreq structure, lifr_name will receive the interface
* name and lifr_addr the address. The actual number of bytes
* transferred is returned in lifc_len.
*/
strncpy(req->lifr_name, dev->d_ifname, IFNAMSIZ);
inaddr->sin6_family = AF_INET6;
inaddr->sin6_port = 0;
net_ipv6addr_copy(inaddr->sin6_addr.s6_addr16, dev->d_ipv6addr);
}
/* Increment the size of the buffer in any event */
lifc->lifc_len += sizeof(struct lifreq);
}
return 0;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netdev_ipv4_ifconf
*
* Description:
* Return the IPv4 configuration of each network adapter that (1) has
* and IPv4 address assigned and (2) is in the UP state
*
* Input Parameters:
* ifc - A reference to the instance of struct ifconf in which to return
* the information.
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
* Assumptions:
* The network is locked
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
int netdev_ipv4_ifconf(FAR struct ifconf *ifc)
{
struct ifconf_ipv4_info_s info;
info.bufsize = ifc->ifc_len;
info.ifc = ifc;
ifc->ifc_len = 0;
return netdev_foreach(ifconf_ipv4_callback, (FAR void *)&info);
}
#endif
/****************************************************************************
* Name: netdev_ipv6_ifconf
*
* Description:
* Return the IPv6 configuration of each network adapter that (1) has
* and IPv6 address assigned and (2) is in the UP state.
*
* Input Parameters:
* lifc - A reference to the instance of struct lifconf in which to return
* the information.
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
* Assumptions:
* The network is locked
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
int netdev_ipv6_ifconf(FAR struct lifconf *lifc)
{
struct ifconf_ipv6_info_s info;
info.bufsize = lifc->lifc_len;
info.lifc = lifc;
lifc->lifc_len = 0;
return netdev_foreach(ifconf_ipv6_callback, (FAR void *)&info);
}
#endif
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