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mac802154: Handle disassociation notifications from peers

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Peers may decided to disassociate from us, their coordinator, in this
case they will send a disassociation notification which we must
acknowledge. If we don't, the peer device considers itself disassociated
anyway. We also need to drop the reference to this child from our
internal structures.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/linux-wpan/20230927181214.129346-11-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2023-09-27 20:12:13 +02:00
parent 80f8bf9a2a
commit 1e2a45f1f8
3 changed files with 65 additions and 0 deletions
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2
net/mac802154/ieee802154_i.h
View File

@ -318,6 +318,8 @@ static inline bool mac802154_is_associating(struct ieee802154_local *local)
int mac802154_send_disassociation_notif(struct ieee802154_sub_if_data *sdata,
struct ieee802154_pan_device *target,
u8 reason);
int mac802154_process_disassociation_notif(struct ieee802154_sub_if_data *sdata,
struct sk_buff *skb);
int mac802154_process_association_req(struct ieee802154_sub_if_data *sdata,
struct sk_buff *skb);

8
net/mac802154/rx.c
View File

@ -110,6 +110,14 @@ void mac802154_rx_mac_cmd_worker(struct work_struct *work)
mac802154_process_association_req(mac_pkt->sdata, mac_pkt->skb);
break;
case IEEE802154_CMD_DISASSOCIATION_NOTIFY:
dev_dbg(&mac_pkt->sdata->dev->dev, "processing DISASSOC NOTIF\n");
if (mac_pkt->sdata->wpan_dev.iftype != NL802154_IFTYPE_COORD)
break;
mac802154_process_disassociation_notif(mac_pkt->sdata, mac_pkt->skb);
break;
default:
break;
}

55
net/mac802154/scan.c
View File

@ -852,3 +852,58 @@ unlock:
mutex_unlock(&wpan_dev->association_lock);
return ret;
}
int mac802154_process_disassociation_notif(struct ieee802154_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee802154_addr *src = &mac_cb(skb)->source;
struct ieee802154_addr *dest = &mac_cb(skb)->dest;
struct wpan_dev *wpan_dev = &sdata->wpan_dev;
struct ieee802154_pan_device *child;
struct ieee802154_addr target;
bool parent;
u64 teaddr;
if (skb->len != sizeof(u8))
return -EINVAL;
if (unlikely(src->mode != IEEE802154_EXTENDED_ADDRESSING))
return -EINVAL;
if (dest->mode == IEEE802154_EXTENDED_ADDRESSING &&
unlikely(dest->extended_addr != wpan_dev->extended_addr))
return -ENODEV;
else if (dest->mode == IEEE802154_SHORT_ADDRESSING &&
unlikely(dest->short_addr != wpan_dev->short_addr))
return -ENODEV;
if (dest->pan_id != wpan_dev->pan_id)
return -ENODEV;
target.mode = IEEE802154_EXTENDED_ADDRESSING;
target.extended_addr = src->extended_addr;
teaddr = swab64((__force u64)target.extended_addr);
dev_dbg(&skb->dev->dev, "Processing DISASSOC NOTIF from %8phC\n", &teaddr);
mutex_lock(&wpan_dev->association_lock);
parent = cfg802154_device_is_parent(wpan_dev, &target);
if (!parent)
child = cfg802154_device_is_child(wpan_dev, &target);
if (!parent && !child) {
mutex_unlock(&wpan_dev->association_lock);
return -EINVAL;
}
if (parent) {
kfree(wpan_dev->parent);
wpan_dev->parent = NULL;
} else {
list_del(&child->node);
kfree(child);
wpan_dev->nchildren--;
}
mutex_unlock(&wpan_dev->association_lock);
return 0;
}