mirror of
https://github.com/apache/nuttx.git
synced 2026-05-12 01:42:49 +08:00
Gregory Nutt
22cd0d47fa
This makes the user interface a little hostile. People thing of an MTU of 1500 bytes, but the corresponding packet is really 1514 bytes (including the 14 byte Ethernet header). A more friendly solution would configure the MTU (as before), but then derive the packet buffer size by adding the MAC header length. Instead, we define the packet buffer size then derive the MTU.
The MTU is not common currency in networking. On the wire, the only real issue is the MSS which is derived from MTU by subtracting the IP header and TCP header sizes (for the case of TCP). Now it is derived for the PKTSIZE by subtracting the IP header, the TCP header, and the MAC header sizes. So we should be all good and without the recurring 14 byte error in MTU's and MSS's.
Squashed commit of the following:
Trivial update to fix some spacing issues.
net/: Rename several macros containing _MTU to _PKTSIZE.
net/: Rename CONFIG_NET_SLIP_MTU to CONFIG_NET_SLIP_PKTSIZE and similarly for CONFIG_NET_TUN_MTU. These are not the MTU which does not include the size of the link layer header. These are the full size of the packet buffer memory (minus any GUARD bytes).
net/: Rename CONFIG_NET_6LOWPAN_MTU to CONFIG_NET_6LOWPAN_PKTSIZE and similarly for CONFIG_NET_TUN_MTU. These are not the MTU which does not include the size of the link layer header. These are the full size of the packet buffer memory (minus any GUARD bytes).
net/: Rename CONFIG_NET_ETH_MTU to CONFIG_NET_ETH_PKTSIZE. This is not the MTU which does not include the size of the link layer header. This is the full size of the packet buffer memory (minus any GUARD bytes).
net/: Rename the file d_mtu in the network driver structure to d_pktsize. That value saved there is not the MTU. The packetsize is the memory large enough to hold the maximum packet PLUS the size of the link layer header. The MTU does not include the link layer header.
415 lines
12 KiB
C
415 lines
12 KiB
C
/****************************************************************************
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* net/netdev/netdev_register.c
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*
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* Copyright (C) 2007-2012, 2014-2015, 2017-2018 Gregory Nutt. All rights
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* reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <semaphore.h>
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#include <assert.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <net/if.h>
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#include <net/ethernet.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/arp.h>
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#include <nuttx/net/bluetooth.h>
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#include "utils/utils.h"
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#include "igmp/igmp.h"
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#include "netdev/netdev.h"
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NETDEV_ETH_FORMAT "eth%d"
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#define NETDEV_LO_FORMAT "lo"
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#define NETDEV_SLIP_FORMAT "sl%d"
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#define NETDEV_TUN_FORMAT "tun%d"
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#define NETDEV_BNEP_FORMAT "bnep%d"
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#define NETDEV_PAN_FORMAT "pan%d"
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#define NETDEV_WLAN_FORMAT "wlan%d"
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#define NETDEV_WPAN_FORMAT "wpan%d"
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#if defined(CONFIG_DRIVERS_IEEE80211) /* Usually also has CONFIG_NET_ETHERNET */
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# define NETDEV_DEFAULT_FORMAT NETDEV_WLAN_FORMAT
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#elif defined(CONFIG_NET_ETHERNET)
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# define NETDEV_DEFAULT_FORMAT NETDEV_ETH_FORMAT
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#elif defined(CONFIG_NET_6LOWPAN)
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# define NETDEV_DEFAULT_FORMAT NETDEV_WPAN_FORMAT
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#elif defined(CONFIG_NET_SLIP)
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# define NETDEV_DEFAULT_FORMAT NETDEV_SLIP_FORMAT
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#elif defined(CONFIG_NET_TUN)
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# define NETDEV_DEFAULT_FORMAT NETDEV_TUN_FORMAT
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#else /* if defined(CONFIG_NET_LOOPBACK) */
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# define NETDEV_DEFAULT_FORMAT NETDEV_LO_FORMAT
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* List of registered Ethernet device drivers */
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struct net_driver_s *g_netdevices = NULL;
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#ifdef CONFIG_NETDEV_IFINDEX
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/* The set of network devices that have been registered. This is used to
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* assign a unique device index to the newly registered device.
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*
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* REVISIT: The width of g_nassigned limits the number of registered
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* devices to 32 (MAX_IFINDEX).
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*/
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uint32_t g_devset;
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/* The set of network devices that have been freed. The purpose of this
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* set is to postpone reuse of a interface index for as long as possible,
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* i.e., don't reuse an interface index until all of the possible indices
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* have been used.
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*/
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uint32_t g_devfreed;
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: find_devnum
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*
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* Description:
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* Given a device name format string, find the next device number for the
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* class of device represented by that format string.
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*
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* Input Parameters:
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* devfmt - The device format string
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*
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* Returned Value:
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* The next device number for that device class
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*
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****************************************************************************/
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static int find_devnum(FAR const char *devfmt)
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{
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FAR struct net_driver_s *curr;
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size_t fmt_size;
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int result = 0;
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fmt_size = strlen(devfmt);
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/* Assumed that devfmt is xxx%d */
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DEBUGASSERT(fmt_size > 2);
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fmt_size -= 2;
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/* Search the list of currently registered network devices */
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for (curr = g_netdevices; curr; curr = curr->flink )
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{
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/* Does this device name match the format we were given? */
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if (strncmp(curr->d_ifname, devfmt, fmt_size) == 0)
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{
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/* Yes.. increment the candidate device number */
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result++;
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}
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}
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/* Return this next device number for this format */
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return result;
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}
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/****************************************************************************
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* Name: get_ifindex
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*
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* Description:
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* Assign a unique interface index to the device.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* The interface index assigned to the device. -ENOSPC is returned if
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* more the MAX_IFINDEX names have been assigned.
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*
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****************************************************************************/
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#ifdef CONFIG_NETDEV_IFINDEX
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static int get_ifindex(void)
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{
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uint32_t devset;
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int ndx;
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/* Try to postpone re-using interface indices as long as possible */
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devset = g_devset | g_devfreed;
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if (devset == 0xffffffff)
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{
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/* Time start re-using interface indices */
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devset = g_devset;
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g_devfreed = 0;
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}
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/* Search for an unused index */
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for (ndx = 0; ndx < MAX_IFINDEX; ndx++)
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{
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uint32_t bit = 1L << ndx;
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if ((devset & bit) == 0)
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{
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/* Indicate that this index is in use */
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g_devset |= bit;
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/* NOTE that the index + 1 is returned. Zero is reserved to
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* mean no-index in the POSIX standards.
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*/
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return ndx + 1;
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}
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}
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return -ENOSPC;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: netdev_register
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*
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* Description:
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* Register a network device driver and assign a name to it so that it can
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* be found in subsequent network ioctl operations on the device.
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*
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* Input Parameters:
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* dev - The device driver structure to be registered.
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* lltype - Link level protocol used by the driver (Ethernet, SLIP, TUN, ...
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* ...
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*
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* Returned Value:
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* 0:Success; negated errno on failure
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*
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* Assumptions:
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* Called during system bring-up, but also when a removable network
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* device is installed.
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*
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****************************************************************************/
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int netdev_register(FAR struct net_driver_s *dev, enum net_lltype_e lltype)
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{
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FAR const char *devfmt;
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#ifdef CONFIG_NET_USER_DEVFMT
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FAR const char devfmt_str[IFNAMSIZ];
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#endif
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int devnum;
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#ifdef CONFIG_NETDEV_IFINDEX
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int ifindex;
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#endif
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if (dev != NULL)
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{
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/* Set the protocol used by the device and the size of the link
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* header used by this protocol.
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*/
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switch (lltype)
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{
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#ifdef CONFIG_NET_LOOPBACK
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case NET_LL_LOOPBACK: /* Local loopback */
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dev->d_llhdrlen = 0;
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dev->d_pktsize = NET_LO_PKTSIZE;
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devfmt = NETDEV_LO_FORMAT;
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break;
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#endif
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#ifdef CONFIG_NET_ETHERNET
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case NET_LL_ETHERNET: /* Ethernet */
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dev->d_llhdrlen = ETH_HDRLEN;
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dev->d_pktsize = CONFIG_NET_ETH_PKTSIZE;
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devfmt = NETDEV_ETH_FORMAT;
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break;
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#endif
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#ifdef CONFIG_DRIVERS_IEEE80211
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case NET_LL_IEEE80211: /* IEEE 802.11 */
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dev->d_llhdrlen = ETH_HDRLEN;
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dev->d_pktsize = CONFIG_NET_ETH_PKTSIZE;
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devfmt = NETDEV_WLAN_FORMAT;
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break;
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#endif
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#ifdef CONFIG_NET_BLUETOOTH
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case NET_LL_BLUETOOTH: /* Bluetooth */
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dev->d_llhdrlen = BLUETOOTH_MAX_HDRLEN; /* Determined at runtime */
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#ifdef CONFIG_NET_6LOWPAN
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dev->d_pktsize = CONFIG_NET_6LOWPAN_PKTSIZE;
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#endif
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devfmt = NETDEV_BNEP_FORMAT;
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break;
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#endif
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#if defined(CONFIG_NET_6LOWPAN) || defined(CONFIG_NET_IEEE802154)
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case NET_LL_IEEE802154: /* IEEE 802.15.4 MAC */
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case NET_LL_PKTRADIO: /* Non-IEEE 802.15.4 packet radio */
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dev->d_llhdrlen = 0; /* Determined at runtime */
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#ifdef CONFIG_NET_6LOWPAN
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dev->d_pktsize = CONFIG_NET_6LOWPAN_PKTSIZE;
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#endif
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devfmt = NETDEV_WPAN_FORMAT;
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break;
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#endif
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#ifdef CONFIG_NET_SLIP
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case NET_LL_SLIP: /* Serial Line Internet Protocol (SLIP) */
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dev->d_llhdrlen = 0;
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dev->d_pktsize = CONFIG_NET_SLIP_PKTSIZE;
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devfmt = NETDEV_SLIP_FORMAT;
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break;
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#endif
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#ifdef CONFIG_NET_TUN
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case NET_LL_TUN: /* Virtual Network Device (TUN) */
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dev->d_llhdrlen = 0; /* This will be overwritten by tun_ioctl
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* if used as a TAP (layer 2) device */
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dev->d_pktsize = CONFIG_NET_TUN_PKTSIZE;
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devfmt = NETDEV_TUN_FORMAT;
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break;
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#endif
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default:
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nerr("ERROR: Unrecognized link type: %d\n", lltype);
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return -EINVAL;
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}
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/* Remember the verified link type */
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dev->d_lltype = (uint8_t)lltype;
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/* There are no clients of the device yet */
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dev->d_conncb = NULL;
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dev->d_devcb = NULL;
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/* We need exclusive access for the following operations */
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net_lock();
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#ifdef CONFIG_NETDEV_IFINDEX
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ifindex = get_ifindex();
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if (ifindex < 0)
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{
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return ifindex;
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}
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dev->d_ifindex = (uint8_t)ifindex;
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#endif
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/* Get the next available device number and assign a device name to
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* the interface
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*/
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#ifdef CONFIG_NET_LOOPBACK
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/* The local loopback device is a special case: There can be only one
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* local loopback device so it is unnumbered.
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*/
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if (lltype == NET_LL_LOOPBACK)
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{
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devnum = 0;
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}
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else
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#endif
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{
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devnum = find_devnum(devfmt);
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}
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#ifdef CONFIG_NET_USER_DEVFMT
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if (*dev->d_ifname)
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{
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strncpy(devfmt_str, dev->d_ifname, IFNAMSIZ);
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devfmt = devfmt_str;
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}
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#endif
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snprintf(dev->d_ifname, IFNAMSIZ, devfmt, devnum);
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/* Add the device to the list of known network devices */
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dev->flink = g_netdevices;
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g_netdevices = dev;
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/* Configure the device for IGMP support */
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#ifdef CONFIG_NET_IGMP
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igmp_devinit(dev);
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#endif
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net_unlock();
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#if defined(CONFIG_NET_ETHERNET) || defined(CONFIG_DRIVERS_IEEE80211)
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ninfo("Registered MAC: %02x:%02x:%02x:%02x:%02x:%02x as dev: %s\n",
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dev->d_mac.ether.ether_addr_octet[0], dev->d_mac.ether.ether_addr_octet[1],
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dev->d_mac.ether.ether_addr_octet[2], dev->d_mac.ether.ether_addr_octet[3],
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dev->d_mac.ether.ether_addr_octet[4], dev->d_mac.ether.ether_addr_octet[5],
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dev->d_ifname);
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#else
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ninfo("Registered dev: %s\n", dev->d_ifname);
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#endif
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return OK;
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}
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return -EINVAL;
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}
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#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */
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