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device: generate pseudo 48-bit address from the WPAN short one

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If an IEEE 802.15.4 WPAN device has a short address it is to be used to
get an interface identifier.
This commit is contained in:
Lubomir Rintel
2018-05-23 11:21:51 +02:00
parent 1d396e9972
commit 49844ea55f
1 changed files with 33 additions and 3 deletions
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36
src/devices/nm-device.c
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@@ -1736,7 +1736,11 @@ static gboolean
get_ip_iface_identifier (NMDevice *self, NMUtilsIPv6IfaceId *out_iid)
{
NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
NMPlatform *platform = nm_device_get_platform (self);
const NMPlatformLink *pllink;
const guint8 *hwaddr;
guint8 pseudo_hwaddr[ETH_ALEN];
guint hwaddr_len;
int ifindex;
gboolean success;
@@ -1744,7 +1748,7 @@ get_ip_iface_identifier (NMDevice *self, NMUtilsIPv6IfaceId *out_iid)
ifindex = nm_device_get_ip_ifindex (self);
g_return_val_if_fail (ifindex > 0, FALSE);
pllink = nm_platform_link_get (nm_device_get_platform (self), ifindex);
pllink = nm_platform_link_get (platform, ifindex);
if ( !pllink
|| NM_IN_SET (pllink->type, NM_LINK_TYPE_NONE, NM_LINK_TYPE_UNKNOWN))
return FALSE;
@@ -1754,9 +1758,35 @@ get_ip_iface_identifier (NMDevice *self, NMUtilsIPv6IfaceId *out_iid)
if (pllink->addr.len > NM_UTILS_HWADDR_LEN_MAX)
g_return_val_if_reached (FALSE);
hwaddr = pllink->addr.data;
hwaddr_len = pllink->addr.len;
if (pllink->type == NM_LINK_TYPE_6LOWPAN) {
/* If the underlying IEEE 802.15.4 device has a short address we generate
* a "pseudo 48-bit address" that's to be used in the same fashion as a
* wired Ethernet address. The mechanism is specified in Section 6. of
* RFC 4944 */
guint16 pan_id;
guint16 short_addr;
short_addr = nm_platform_wpan_get_short_addr (platform, pllink->parent);
if (short_addr != G_MAXUINT16) {
pan_id = nm_platform_wpan_get_pan_id (platform, pllink->parent);
pseudo_hwaddr[0] = short_addr & 0xff;
pseudo_hwaddr[1] = (short_addr >> 8) & 0xff;
pseudo_hwaddr[2] = 0;
pseudo_hwaddr[3] = 0;
pseudo_hwaddr[4] = pan_id & 0xff;
pseudo_hwaddr[5] = (pan_id >> 8) & 0xff;
hwaddr = pseudo_hwaddr;
hwaddr_len = G_N_ELEMENTS (pseudo_hwaddr);
}
}
success = nm_utils_get_ipv6_interface_identifier (pllink->type,
pllink->addr.data,
pllink->addr.len,
hwaddr,
hwaddr_len,
priv->dev_id,
out_iid);
if (!success) {