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incubator-nuttx/wireless/ieee802154/mac802154_loopback.c

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/****************************************************************************
* wireless/ieee802154/mac802154_loopback.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <nuttx/wqueue.h>
#include <nuttx/mm/iob.h>
#include <nuttx/net/net.h>
#include <nuttx/net/ip.h>
#include <nuttx/net/radiodev.h>
#include <nuttx/net/ieee802154.h>
#include <nuttx/net/sixlowpan.h>
#include <nuttx/wireless/ieee802154/ieee802154_loopback.h>
#include "mac802154.h"
#ifdef CONFIG_IEEE802154_LOOPBACK
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* We need to have the work queue to handle SPI interrupts */
#if !defined(CONFIG_SCHED_WORKQUEUE)
# error Worker thread support is required (CONFIG_SCHED_WORKQUEUE)
#endif
/* The low priority work queue is preferred. If it is not enabled, LPWORK
* will be the same as HPWORK.
*
* NOTE: However, the network should NEVER run on the high priority work
* queue! That queue is intended only to service short back end interrupt
* processing that never suspends. Suspending the high priority work queue
* may bring the system to its knees!
*/
#define LPBKWORK LPWORK
/* Preferred address size */
#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
# define LO_ADDRSIZE IEEE802154_EADDRSIZE
#else
# define LO_ADDRSIZE IEEE802154_SADDRSIZE
#endif
/* Frame size */
#if defined(CONFIG_NET_IEEE802154_FRAMELEN)
# define LO_FRAMELEN CONFIG_NET_IEEE802154_FRAMELEN
#else
# define LO_FRAMELEN IEEE802154_MAX_PHY_PACKET_SIZE
#endif
/* Fake value for MAC header length */
#define MAC_HDRLEN 9
/****************************************************************************
* Private Types
****************************************************************************/
/* The lo_driver_s encapsulates all state information for a single hardware
* interface
*/
struct lo_driver_s
{
bool lo_bifup; /* true:ifup false:ifdown */
bool lo_pending; /* True: TX poll pending */
uint8_t lo_panid[2]; /* Fake PAN ID for testing */
struct work_s lo_work; /* For deferring poll work to the work queue */
FAR struct iob_s *lo_head; /* Head of IOBs queued for loopback */
FAR struct iob_s *lo_tail; /* Tail of IOBs queued for loopback */
/* This holds the information visible to the NuttX network */
struct radio_driver_s lo_radio; /* Interface understood by the network */
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct lo_driver_s g_loopback;
#ifdef CONFIG_NET_6LOWPAN
static struct sixlowpan_reassbuf_s g_iobuffer;
#endif
static uint8_t g_eaddr[IEEE802154_EADDRSIZE] =
{
0x0c, 0xfa, 0xde, 0x00, 0xde, 0xad, 0xbe, 0xef
};
static uint8_t g_saddr[IEEE802154_SADDRSIZE] =
{
0xab, 0xcd
};
static uint8_t g_panid[IEEE802154_PANIDSIZE] =
{
0xca, 0xfe
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Utility functions */
static void lo_addr2ip(FAR struct net_driver_s *dev);
static inline void lo_netmask(FAR struct net_driver_s *dev);
/* Polling logic */
static int lo_loopback(FAR struct net_driver_s *dev);
static void lo_loopback_work(FAR void *arg);
/* NuttX callback functions */
static int lo_ifup(FAR struct net_driver_s *dev);
static int lo_ifdown(FAR struct net_driver_s *dev);
static void lo_txavail_work(FAR void *arg);
static int lo_txavail(FAR struct net_driver_s *dev);
#ifdef CONFIG_NET_MCASTGROUP
static int lo_addmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac);
static int lo_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac);
#endif
#ifdef CONFIG_NETDEV_IOCTL
static int lo_ioctl(FAR struct net_driver_s *dev, int cmd,
unsigned long arg);
#endif
static int lo_get_mhrlen(FAR struct radio_driver_s *netdev,
FAR const void *meta);
static int lo_req_data(FAR struct radio_driver_s *netdev,
FAR const void *meta, FAR struct iob_s *framelist);
static int lo_properties(FAR struct radio_driver_s *netdev,
FAR struct radiodev_properties_s *properties);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: lo_addr2ip
*
* Description:
* Create a MAC-based IP address from the IEEE 802.15.14 short or extended
* address assigned to the node.
*
* 128 112 96 80 64 48 32 16
* ---- ---- ---- ---- ---- ---- ---- ----
* fe80 0000 0000 0000 0000 00ff fe00 xxxx 2-byte
* short address IEEE 48-bit MAC
* fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte
* extended address IEEE EUI-64
*
****************************************************************************/
#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
static void lo_addr2ip(FAR struct net_driver_s *dev)
{
/* Set the MAC address as the eaddr */
dev->d_mac.radio.nv_addrlen = IEEE802154_EADDRSIZE;
IEEE802154_EADDRCOPY(dev->d_mac.radio.nv_addr, g_eaddr);
#ifdef CONFIG_NET_IPv6
/* Set the IP address based on the eaddr */
dev->d_ipv6addr[0] = HTONS(0xfe80);
dev->d_ipv6addr[1] = 0;
dev->d_ipv6addr[2] = 0;
dev->d_ipv6addr[3] = 0;
dev->d_ipv6addr[4] = HTONS((uint16_t)g_eaddr[0] << 8 |
(uint16_t)g_eaddr[1]);
dev->d_ipv6addr[5] = HTONS((uint16_t)g_eaddr[2] << 8 |
(uint16_t)g_eaddr[3]);
dev->d_ipv6addr[6] = HTONS((uint16_t)g_eaddr[4] << 8 |
(uint16_t)g_eaddr[5]);
dev->d_ipv6addr[7] = HTONS((uint16_t)g_eaddr[6] << 8 |
(uint16_t)g_eaddr[7]);
/* Invert the U/L bit */
dev->d_ipv6addr[4] ^= HTONS(0x0200);
#endif
}
#else
static void lo_addr2ip(FAR struct net_driver_s *dev)
{
/* Set the MAC address as the saddr */
dev->d_mac.radio.nv_addrlen = IEEE802154_SADDRSIZE;
IEEE802154_SADDRCOPY(dev->d_mac.radio.nv_addr, g_saddr);
#ifdef CONFIG_NET_IPv6
/* Set the IP address based on the saddr */
dev->d_ipv6addr[0] = HTONS(0xfe80);
dev->d_ipv6addr[1] = 0;
dev->d_ipv6addr[2] = 0;
dev->d_ipv6addr[3] = 0;
dev->d_ipv6addr[4] = 0;
dev->d_ipv6addr[5] = HTONS(0x00ff);
dev->d_ipv6addr[6] = HTONS(0xfe00);
dev->d_ipv6addr[7] = HTONS((uint16_t)g_saddr[0] << 8 |
(uint16_t)g_saddr[1]);
#endif
}
#endif
/****************************************************************************
* Name: lo_netmask
*
* Description:
* Create a netmask of a MAC-based IP address which may be based on either
* the IEEE 802.15.14 short or extended address of the MAC.
*
* 128 112 96 80 64 48 32 16
* ---- ---- ---- ---- ---- ---- ---- ----
* fe80 0000 0000 0000 0000 00ff fe00 xxxx 2-byte
* short address IEEE 48-bit MAC
* fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte
* extended address IEEE EUI-64
*
****************************************************************************/
static inline void lo_netmask(FAR struct net_driver_s *dev)
{
#ifdef CONFIG_NET_IPv6
dev->d_ipv6netmask[0] = 0xffff;
dev->d_ipv6netmask[1] = 0xffff;
dev->d_ipv6netmask[2] = 0xffff;
dev->d_ipv6netmask[3] = 0xffff;
#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
dev->d_ipv6netmask[4] = 0;
dev->d_ipv6netmask[5] = 0;
dev->d_ipv6netmask[6] = 0;
dev->d_ipv6netmask[7] = 0;
#else
dev->d_ipv6netmask[4] = 0xffff;
dev->d_ipv6netmask[5] = 0xffff;
dev->d_ipv6netmask[6] = 0xffff;
dev->d_ipv6netmask[7] = 0;
#endif
#endif
}
/****************************************************************************
* Name: lo_loopback
*
* Description:
* Check if the network has any outgoing packets ready to send. This is
* a callback from devif_poll(). devif_poll() will be called only during
* normal TX polling.
*
* Input Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
* May or may not be called from an interrupt handler. In either case,
* the network is locked.
*
****************************************************************************/
static int lo_loopback(FAR struct net_driver_s *dev)
{
FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private;
struct ieee802154_data_ind_s ind;
FAR struct iob_s *iob;
int ret;
/* Create some fake metadata */
memset(&ind, 0, sizeof(struct ieee802154_data_ind_s));
#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
ind.src.mode = IEEE802154_ADDRMODE_EXTENDED;
ind.dest.mode = IEEE802154_ADDRMODE_EXTENDED;
#else
ind.src.mode = IEEE802154_ADDRMODE_SHORT;
ind.dest.mode = IEEE802154_ADDRMODE_SHORT;
#endif
/* On loopback the local address is both the source and destination. */
IEEE802154_PANIDCOPY(ind.src.panid, g_panid);
IEEE802154_SADDRCOPY(ind.src.saddr, g_saddr);
IEEE802154_EADDRCOPY(ind.src.eaddr, g_eaddr);
IEEE802154_PANIDCOPY(ind.dest.panid, g_panid);
IEEE802154_SADDRCOPY(ind.dest.saddr, g_saddr);
IEEE802154_EADDRCOPY(ind.dest.eaddr, g_eaddr);
/* Loop while there framelist to be sent, i.e., while the freme list is not
* empty. Sending, of course, just means relaying back through the network
* for this driver.
*/
while (priv->lo_head != NULL)
{
ninfo("Looping frame IOB %p\n", iob);
/* Increment statistics */
NETDEV_RXPACKETS(&priv->lo_radio.r_dev);
/* Remove the IOB from the queue */
iob = priv->lo_head;
priv->lo_head = iob->io_flink;
iob->io_flink = NULL;
/* Did the framelist become empty? */
if (priv->lo_head == NULL)
{
priv->lo_tail = NULL;
}
/* Return the next frame to the network */
ninfo("Send frame %p to the network: Offset=%u Length=%u\n",
iob, iob->io_offset, iob->io_len);
#ifdef CONFIG_NET_IEEE802154
/* Invoke the PF_IEEE802154 tap first. If the frame matches
* with a connected PF_IEEE802145 socket, it will take the
* frame and return success.
*/
ret = ieee802154_input(&priv->lo_radio, iob, (FAR void *)&ind);
#ifdef CONFIG_NET_6LOWPAN
/* If PF_IEEE802154 was not interested in the frame, then
* give it to 6LoWPAN.
*/
if (ret < 0)
#endif
#endif
#ifdef CONFIG_NET_6LOWPAN
{
/* Make sure the our single packet buffer is attached */
priv->lo_radio.r_dev.d_buf = g_iobuffer.rb_buf;
/* Then give the frame to 6LoWPAN */
ret = sixlowpan_input(&priv->lo_radio, iob, (FAR void *)&ind);
}
#endif
/* Increment statistics */
NETDEV_TXPACKETS(&priv->lo_radio.r_dev);
if (ret < 0)
{
nerr("ERROR: sixlowpan_input returned %d\n", ret);
NETDEV_TXERRORS(&priv->lo_radio.r_dev);
NETDEV_ERRORS(&priv->lo_radio.r_dev);
}
}
return 0;
}
/****************************************************************************
* Name: lo_loopback_work
*
* Description:
* Perform loopback of received framelist.
*
* Input Parameters:
* arg - The argument passed when work_queue() as called.
*
* Returned Value:
* OK on success
*
* Assumptions:
* The network is locked
*
****************************************************************************/
static void lo_loopback_work(FAR void *arg)
{
FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)arg;
/* Perform the loopback */
net_lock();
lo_loopback(&priv->lo_radio.r_dev);
net_unlock();
}
/****************************************************************************
* Name: lo_ifup
*
* Description:
* NuttX Callback: Bring up the Ethernet interface when an IP address is
* provided
*
* Input Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int lo_ifup(FAR struct net_driver_s *dev)
{
FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private;
#ifdef CONFIG_NET_IPv6
ninfo("Bringing up: IPv6 %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
dev->d_ipv6addr[0], dev->d_ipv6addr[1], dev->d_ipv6addr[2],
dev->d_ipv6addr[3], dev->d_ipv6addr[4], dev->d_ipv6addr[5],
dev->d_ipv6addr[6], dev->d_ipv6addr[7]);
#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
ninfo("Node: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x PANID=%02x:%02x\n",
dev->d_mac.radio.nv_addr[0], dev->d_mac.radio.nv_addr[1],
dev->d_mac.radio.nv_addr[2], dev->d_mac.radio.nv_addr[3],
dev->d_mac.radio.nv_addr[4], dev->d_mac.radio.nv_addr[5],
dev->d_mac.radio.nv_addr[6], dev->d_mac.radio.nv_addr[7],
priv->lo_panid[0], priv->lo_panid[1]);
#else
ninfo(" Node: %02x:%02x PANID=%02x:%02x\n",
dev->d_mac.radio.nv_addr[0], dev->d_mac.radio.nv_addr[1],
priv->lo_panid[0], priv->lo_panid[1]);
#endif
#else
if (dev->d_mac.radio.nv_addrlen == 8)
{
ninfo("Bringing up: Node: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
dev->d_mac.radio.nv_addr[0], dev->d_mac.radio.nv_addr[1],
dev->d_mac.radio.nv_addr[2], dev->d_mac.radio.nv_addr[3],
dev->d_mac.radio.nv_addr[4], dev->d_mac.radio.nv_addr[5],
dev->d_mac.radio.nv_addr[6], dev->d_mac.radio.nv_addr[7]);
ninfo(" PANID=%02x:%02x\n",
priv->lo_panid[0], priv->lo_panid[1]);
}
else if (dev->d_mac.radio.nv_addrlen == 2)
{
ninfo("Bringing up: Node: %02x:%02x PANID=%02x:%02x\n",
dev->d_mac.radio.nv_addr[0], dev->d_mac.radio.nv_addr[1],
priv->lo_panid[0], priv->lo_panid[1]);
}
else
{
nerr("ERROR: No address assigned\n");
}
#endif
priv->lo_bifup = true;
return OK;
}
/****************************************************************************
* Name: lo_ifdown
*
* Description:
* NuttX Callback: Stop the interface.
*
* Input Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int lo_ifdown(FAR struct net_driver_s *dev)
{
FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private;
ninfo("IP up: %u\n", priv->lo_bifup);
/* Mark the device "down" */
priv->lo_bifup = false;
return OK;
}
/****************************************************************************
* Name: lo_txavail_work
*
* Description:
* Perform an out-of-cycle poll on the worker thread.
*
* Input Parameters:
* arg - Reference to the NuttX driver state structure (cast to void*)
*
* Returned Value:
* None
*
* Assumptions:
* Called on the higher priority worker thread.
*
****************************************************************************/
static void lo_txavail_work(FAR void *arg)
{
FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)arg;
ninfo("TX available work. IP up: %u\n", priv->lo_bifup);
/* Ignore the notification if the interface is not yet up */
net_lock();
if (priv->lo_bifup)
{
/* If so, then poll the network for new XMIT data */
#ifdef CONFIG_NET_6LOWPAN
/* Make sure the our single packet buffer is attached */
priv->lo_radio.r_dev.d_buf = g_iobuffer.rb_buf;
#endif
devif_poll(&priv->lo_radio.r_dev, lo_loopback);
}
net_unlock();
}
/****************************************************************************
* Name: lo_txavail
*
* Description:
* Driver callback invoked when new TX data is available. This is a
* stimulus perform an out-of-cycle poll and, thereby, reduce the TX
* latency.
*
* Input Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Called in normal user mode
*
****************************************************************************/
static int lo_txavail(FAR struct net_driver_s *dev)
{
FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private;
ninfo("Available: %u\n", work_available(&priv->lo_work));
/* Is our single work structure available? It may not be if there are
* pending actions and we will have to ignore the Tx availability
* action.
*/
if (!work_available(&priv->lo_work) || priv->lo_head != NULL)
{
nwarn("WARNING: lo_work NOT available\n");
priv->lo_pending = true;
}
else
{
/* Schedule to perform the interrupt processing on the worker thread. */
priv->lo_pending = false;
work_queue(LPBKWORK, &priv->lo_work, lo_txavail_work, priv, 0);
}
return OK;
}
/****************************************************************************
* Name: lo_addmac
*
* Description:
* NuttX Callback: Add the specified MAC address to the hardware multicast
* address filtering
*
* Input Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be added
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_MCASTGROUP
static int lo_addmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac)
{
#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
ninfo("MAC: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5], mac[6], mac[7]);
#else
ninfo("MAC: %02x:%02x\n",
mac[0], mac[1]);
#endif
/* There is no multicast support in the loopback driver */
return OK;
}
#endif
/****************************************************************************
* Name: lo_rmmac
*
* Description:
* NuttX Callback: Remove the specified MAC address from the hardware
* multicast address filtering
*
* Input Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be removed
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_MCASTGROUP
static int lo_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac)
{
#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
ninfo("MAC: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5], mac[6], mac[7]);
#else
ninfo("MAC: %02x:%02x\n",
mac[0], mac[1]);
#endif
/* There is no multicast support in the loopback driver */
return OK;
}
#endif
/****************************************************************************
* Name: macnet_ioctl
*
* Description:
* Handle network IOCTL commands directed to this device.
*
* Input Parameters:
* dev - Reference to the NuttX driver state structure
* cmd - The IOCTL command
* arg - The argument for the IOCTL command
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NETDEV_IOCTL
static int lo_ioctl(FAR struct net_driver_s *dev, int cmd,
unsigned long arg)
{
FAR struct lo_driver_s *priv;
DEBUGASSERT(dev != NULL && dev->d_private != NULL);
priv = (FAR struct lo_driver_s *)dev->d_private;
UNUSED(priv);
/* Check for IOCTLs aimed at the IEEE802.15.4 MAC layer */
if (_MAC802154IOCVALID(cmd))
{
FAR struct ieee802154_netmac_s *netmac =
(FAR struct ieee802154_netmac_s *)arg;
DEBUGASSERT(netmac != NULL);
if (cmd == MAC802154IOC_MLME_SET_REQUEST)
{
FAR struct ieee802154_set_req_s *setreq = &netmac->u.setreq;
switch (setreq->attr)
{
case IEEE802154_ATTR_MAC_PANID:
IEEE802154_PANIDCOPY(g_panid, setreq->attrval.mac.panid);
break;
case IEEE802154_ATTR_MAC_EADDR:
IEEE802154_EADDRCOPY(g_eaddr, setreq->attrval.mac.eaddr);
#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
lo_addr2ip(dev);
#endif
break;
case IEEE802154_ATTR_MAC_SADDR:
IEEE802154_SADDRCOPY(g_saddr, setreq->attrval.mac.saddr);
#ifndef CONFIG_NET_6LOWPAN_EXTENDEDADDR
lo_addr2ip(dev);
#endif
break;
default:
return -ENOTTY;
}
return OK;
}
else if (cmd == MAC802154IOC_MLME_GET_REQUEST)
{
FAR struct ieee802154_get_req_s *getreq = &netmac->u.getreq;
switch (getreq->attr)
{
case IEEE802154_ATTR_MAC_PANID:
IEEE802154_PANIDCOPY(getreq->attrval.mac.panid, g_panid);
break;
case IEEE802154_ATTR_MAC_EADDR:
IEEE802154_EADDRCOPY(getreq->attrval.mac.eaddr, g_eaddr);
break;
case IEEE802154_ATTR_MAC_SADDR:
IEEE802154_SADDRCOPY(getreq->attrval.mac.saddr, g_saddr);
break;
default:
return -ENOTTY;
}
return OK;
}
else
{
/* Not a supported IEEE 802.15.4 MAC IOCTL command */
return -ENOTTY;
}
}
else
{
/* Not a valid IEEE 802.15.4 MAC IOCTL command */
return -ENOTTY;
}
}
#endif
/****************************************************************************
* Name: lo_get_mhrlen
*
* Description:
* Calculate the MAC header length given the frame meta-data.
*
* Input Parameters:
* netdev - The network device that will mediate the MAC interface
* meta - Obfuscated metadata structure needed to create the radio
* MAC header
*
* Returned Value:
* A non-negative MAC header length is returned on success; a negated
* errno value is returned on any failure.
*
****************************************************************************/
static int lo_get_mhrlen(FAR struct radio_driver_s *netdev,
FAR const void *meta)
{
return MAC_HDRLEN;
}
/****************************************************************************
* Name: lo_req_data
*
* Description:
* Requests the transfer of a list of frames to the MAC.
*
* Input Parameters:
* netdev - The network device that will mediate the MAC interface
* meta - Obfuscated metadata structure needed to create the radio
* MAC header
* framelist - Head of a list of frames to be transferred.
*
* Returned Value:
* Zero (OK) returned on success; a negated errno value is returned on
* any failure.
*
****************************************************************************/
static int lo_req_data(FAR struct radio_driver_s *netdev,
FAR const void *meta, FAR struct iob_s *framelist)
{
FAR struct lo_driver_s *priv;
FAR struct iob_s *iob;
DEBUGASSERT(netdev != NULL && netdev->r_dev.d_private != NULL);
priv = (FAR struct lo_driver_s *)netdev->r_dev.d_private;
DEBUGASSERT(meta != NULL && framelist != NULL);
/* Add the incoming list of framelist to queue of framelist to loopback */
for (iob = framelist; iob != NULL; iob = framelist)
{
/* Increment statistics */
NETDEV_RXPACKETS(&priv->lo_radio.r_dev);
/* Remove the IOB from the queue */
framelist = iob->io_flink;
iob->io_flink = NULL;
ninfo("Queuing frame IOB %p\n", iob);
/* Just zero the MAC header for test purposes */
DEBUGASSERT(iob->io_offset == MAC_HDRLEN);
memset(iob->io_data, 0, MAC_HDRLEN);
/* Add the IOB to the tail of the queue of framelist to be looped
* back
*/
if (priv->lo_tail == NULL)
{
priv->lo_head = iob;
}
else
{
priv->lo_tail->io_flink = iob;
}
priv->lo_tail = iob;
}
/* Schedule to serialize the poll on the worker thread. */
work_queue(LPBKWORK, &priv->lo_work, lo_loopback_work, priv, 0);
return OK;
}
/****************************************************************************
* Name: lo_properties
*
* Description:
* Different packet radios may have different properties. If there are
* multiple packet radios, then those properties have to be queried at
* run time. This information is provided to the 6LoWPAN network via the
* following structure.
*
* Input Parameters:
* netdev - The network device to be queried
* properties - Location where radio properties will be returned.
*
* Returned Value:
* Zero (OK) returned on success; a negated errno value is returned on
* any failure.
*
****************************************************************************/
static int lo_properties(FAR struct radio_driver_s *netdev,
FAR struct radiodev_properties_s *properties)
{
DEBUGASSERT(netdev != NULL && properties != NULL);
memset(properties, 0, sizeof(struct radiodev_properties_s));
/* General */
properties->sp_addrlen = LO_ADDRSIZE; /* Length of an address */
properties->sp_framelen = LO_FRAMELEN; /* Fixed frame length */
/* Multicast address (uses broadcast address)
*
* For meshes (only) a multicast address candetermined by the first 3 bits
* of a short address (RFC 4944):
*
* 0xxxxxxx xxxxxxxx: Unicast address
* 100xxxxx xxxxxxxx: Multicast address
* 101xxxxx xxxxxxxx: Reserved
* 110xxxxx xxxxxxxx: Reserved
* 111xxxxx xxxxxxxx: Reserved
*
* Otherwise, Multicast is implemented with the broadcast address
* (qualified by the destination PANID).
*/
properties->sp_mcast.nv_addrlen = IEEE802154_SADDRSIZE;
memset(properties->sp_mcast.nv_addr, 0xff, RADIO_MAX_ADDRLEN);
/* Broadcast address */
properties->sp_bcast.nv_addrlen = IEEE802154_SADDRSIZE;
memset(properties->sp_mcast.nv_addr, 0xff, RADIO_MAX_ADDRLEN);
#ifdef CONFIG_NET_STARPOINT
/* Star hub node address -- Not supported */
#endif
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ieee8021514_loopback
*
* Description:
* Initialize and register the Ieee802.15.4 MAC loopback network driver.
*
* Input Parameters:
* None
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
int ieee8021514_loopback(void)
{
FAR struct lo_driver_s *priv;
FAR struct radio_driver_s *radio;
FAR struct net_driver_s *dev;
ninfo("Initializing\n");
/* Get the interface structure associated with this interface number. */
priv = &g_loopback;
/* Initialize the driver structure */
memset(priv, 0, sizeof(struct lo_driver_s));
radio = &priv->lo_radio;
dev = &radio->r_dev;
dev->d_ifup = lo_ifup; /* I/F up (new IP address) callback */
dev->d_ifdown = lo_ifdown; /* I/F down callback */
dev->d_txavail = lo_txavail; /* New TX data callback */
#ifdef CONFIG_NET_MCASTGROUP
dev->d_addmac = lo_addmac; /* Add multicast MAC address */
dev->d_rmmac = lo_rmmac; /* Remove multicast MAC address */
#endif
#ifdef CONFIG_NETDEV_IOCTL
dev->d_ioctl = lo_ioctl; /* Handle network IOCTL commands */
#endif
dev->d_private = priv; /* Used to recover private state from dev */
/* Set the network mask and advertise our MAC-based IP address */
lo_netmask(dev);
lo_addr2ip(dev);
/* Initialize the Network frame-related callbacks */
radio->r_get_mhrlen = lo_get_mhrlen; /* Get MAC header length */
radio->r_req_data = lo_req_data; /* Enqueue frame for transmission */
radio->r_properties = lo_properties; /* Returns radio properties */
#ifdef CONFIG_NET_6LOWPAN
/* Make sure the our single packet buffer is attached.
* We must do this before registering the device since, once the device
* is registered, a packet may be attempted to be forwarded and require
* the buffer.
*/
priv->lo_radio.r_dev.d_buf = g_iobuffer.rb_buf;
#endif
/* Register the loopabck device with the OS so that socket IOCTLs can be
* performed.
*/
netdev_register(&priv->lo_radio.r_dev, NET_LL_IEEE802154);
/* Put the network in the UP state */
dev->d_flags = IFF_UP;
return lo_ifup(&priv->lo_radio.r_dev);
}
#endif /* CONFIG_IEEE802154_LOOPBACK */
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