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6lowpan: add 802.15.4 short addr slaac

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This patch adds the autoconfiguration if a valid 802.15.4 short address
is available for 802.15.4 6LoWPAN interfaces.

Cc: David S. Miller <[email protected]>
Cc: Alexey Kuznetsov <[email protected]>
Cc: James Morris <[email protected]>
Cc: Hideaki YOSHIFUJI <[email protected]>
Cc: Patrick McHardy <[email protected]>
Acked-by: Hannes Frederic Sowa <[email protected]>
Reviewed-by: Stefan Schmidt <[email protected]>
Signed-off-by: Alexander Aring <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Alexander Aring 2016-06-15 21:20:17 +02:00 • committed by David S. Miller
commit 2ad3ed5919
4 changed files with 58 additions and 2 deletions
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46
net/6lowpan/core.c
View file

@ -14,6 +14,7 @@
#include <linux/module.h>
#include <net/6lowpan.h>
#include <net/addrconf.h>
#include "6lowpan_i.h"
@ -72,16 +73,61 @@ void lowpan_unregister_netdev(struct net_device *dev)
}
EXPORT_SYMBOL(lowpan_unregister_netdev);
static int addrconf_ifid_802154_6lowpan(u8 *eui, struct net_device *dev)
{
struct wpan_dev *wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr;
/* Set short_addr autoconfiguration if short_addr is present only */
if (!lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr))
return -1;
/* For either address format, all zero addresses MUST NOT be used */
if (wpan_dev->pan_id == cpu_to_le16(0x0000) &&
wpan_dev->short_addr == cpu_to_le16(0x0000))
return -1;
/* Alternatively, if no PAN ID is known, 16 zero bits may be used */
if (wpan_dev->pan_id == cpu_to_le16(IEEE802154_PAN_ID_BROADCAST))
memset(eui, 0, 2);
else
ieee802154_le16_to_be16(eui, &wpan_dev->pan_id);
/* The "Universal/Local" (U/L) bit shall be set to zero */
eui[0] &= ~2;
eui[2] = 0;
eui[3] = 0xFF;
eui[4] = 0xFE;
eui[5] = 0;
ieee802154_le16_to_be16(&eui[6], &wpan_dev->short_addr);
return 0;
}
static int lowpan_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct inet6_dev *idev;
struct in6_addr addr;
int i;
if (dev->type != ARPHRD_6LOWPAN)
return NOTIFY_DONE;
idev = __in6_dev_get(dev);
if (!idev)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UP:
case NETDEV_CHANGE:
/* (802.15.4 6LoWPAN short address slaac handling */
if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154) &&
addrconf_ifid_802154_6lowpan(addr.s6_addr + 8, dev) == 0) {
__ipv6_addr_set_half(&addr.s6_addr32[0],
htonl(0xFE800000), 0);
addrconf_add_linklocal(idev, &addr, 0);
}
break;
case NETDEV_DOWN:
for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE,