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mac802154: Handle received BEACON_REQ
When performing an active scan, devices emit BEACON_REQ which must be answered by other PANs receiving the request, unless they are already passively sending beacons. Answering a beacon request becomes a duty when the user tells us to send beacons and the request provides an interval of 15. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Alexander Aring <aahringo@redhat.com> Link: https://lore.kernel.org/r/20230310145346.1397068-5-miquel.raynal@bootlin.com Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
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@ -193,6 +193,8 @@ int ieee802154_beacon_push(struct sk_buff *skb,
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struct ieee802154_beacon_frame *beacon);
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int ieee802154_mac_cmd_push(struct sk_buff *skb, void *frame,
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const void *pl, unsigned int pl_len);
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int ieee802154_mac_cmd_pl_pull(struct sk_buff *skb,
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struct ieee802154_mac_cmd_pl *mac_pl);
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int ieee802154_max_payload(const struct ieee802154_hdr *hdr);
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@ -307,6 +307,19 @@ ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr)
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}
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EXPORT_SYMBOL_GPL(ieee802154_hdr_pull);
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int ieee802154_mac_cmd_pl_pull(struct sk_buff *skb,
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struct ieee802154_mac_cmd_pl *mac_pl)
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{
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if (!pskb_may_pull(skb, sizeof(*mac_pl)))
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return -EINVAL;
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memcpy(mac_pl, skb->data, sizeof(*mac_pl));
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skb_pull(skb, sizeof(*mac_pl));
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return 0;
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}
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EXPORT_SYMBOL_GPL(ieee802154_mac_cmd_pl_pull);
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int
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ieee802154_hdr_peek_addrs(const struct sk_buff *skb, struct ieee802154_hdr *hdr)
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{
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@ -71,6 +71,8 @@ struct ieee802154_local {
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/* Asynchronous tasks */
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struct list_head rx_beacon_list;
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struct work_struct rx_beacon_work;
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struct list_head rx_mac_cmd_list;
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struct work_struct rx_mac_cmd_work;
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bool started;
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bool suspended;
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@ -155,6 +157,22 @@ ieee802154_sdata_running(struct ieee802154_sub_if_data *sdata)
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return test_bit(SDATA_STATE_RUNNING, &sdata->state);
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}
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static inline int ieee802154_get_mac_cmd(struct sk_buff *skb, u8 *mac_cmd)
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{
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struct ieee802154_mac_cmd_pl mac_pl;
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int ret;
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if (mac_cb(skb)->type != IEEE802154_FC_TYPE_MAC_CMD)
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return -EINVAL;
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ret = ieee802154_mac_cmd_pl_pull(skb, &mac_pl);
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if (ret)
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return ret;
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*mac_cmd = mac_pl.cmd_id;
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return 0;
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}
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extern struct ieee802154_mlme_ops mac802154_mlme_wpan;
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void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb);
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@ -276,6 +294,8 @@ static inline bool mac802154_is_beaconing(struct ieee802154_local *local)
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return test_bit(IEEE802154_IS_BEACONING, &local->ongoing);
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}
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void mac802154_rx_mac_cmd_worker(struct work_struct *work);
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/* interface handling */
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int ieee802154_iface_init(void);
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void ieee802154_iface_exit(void);
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@ -90,6 +90,7 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
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INIT_LIST_HEAD(&local->interfaces);
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INIT_LIST_HEAD(&local->rx_beacon_list);
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INIT_LIST_HEAD(&local->rx_mac_cmd_list);
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mutex_init(&local->iflist_mtx);
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tasklet_setup(&local->tasklet, ieee802154_tasklet_handler);
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@ -100,6 +101,7 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
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INIT_DELAYED_WORK(&local->scan_work, mac802154_scan_worker);
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INIT_WORK(&local->rx_beacon_work, mac802154_rx_beacon_worker);
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INIT_DELAYED_WORK(&local->beacon_work, mac802154_beacon_worker);
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INIT_WORK(&local->rx_mac_cmd_work, mac802154_rx_mac_cmd_worker);
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/* init supported flags with 802.15.4 default ranges */
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phy->supported.max_minbe = 8;
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@ -47,6 +47,62 @@ void mac802154_rx_beacon_worker(struct work_struct *work)
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kfree(mac_pkt);
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}
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static bool mac802154_should_answer_beacon_req(struct ieee802154_local *local)
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{
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struct cfg802154_beacon_request *beacon_req;
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unsigned int interval;
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rcu_read_lock();
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beacon_req = rcu_dereference(local->beacon_req);
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if (!beacon_req) {
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rcu_read_unlock();
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return false;
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}
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interval = beacon_req->interval;
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rcu_read_unlock();
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if (!mac802154_is_beaconing(local))
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return false;
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return interval == IEEE802154_ACTIVE_SCAN_DURATION;
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}
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void mac802154_rx_mac_cmd_worker(struct work_struct *work)
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{
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struct ieee802154_local *local =
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container_of(work, struct ieee802154_local, rx_mac_cmd_work);
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struct cfg802154_mac_pkt *mac_pkt;
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u8 mac_cmd;
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int rc;
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mac_pkt = list_first_entry_or_null(&local->rx_mac_cmd_list,
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struct cfg802154_mac_pkt, node);
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if (!mac_pkt)
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return;
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rc = ieee802154_get_mac_cmd(mac_pkt->skb, &mac_cmd);
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if (rc)
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goto out;
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switch (mac_cmd) {
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case IEEE802154_CMD_BEACON_REQ:
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dev_dbg(&mac_pkt->sdata->dev->dev, "processing BEACON REQ\n");
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if (!mac802154_should_answer_beacon_req(local))
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break;
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queue_delayed_work(local->mac_wq, &local->beacon_work, 0);
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break;
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default:
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break;
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}
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out:
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list_del(&mac_pkt->node);
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kfree_skb(mac_pkt->skb);
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kfree(mac_pkt);
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}
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static int
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ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
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struct sk_buff *skb, const struct ieee802154_hdr *hdr)
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@ -140,8 +196,20 @@ ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
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list_add_tail(&mac_pkt->node, &sdata->local->rx_beacon_list);
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queue_work(sdata->local->mac_wq, &sdata->local->rx_beacon_work);
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return NET_RX_SUCCESS;
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case IEEE802154_FC_TYPE_ACK:
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case IEEE802154_FC_TYPE_MAC_CMD:
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dev_dbg(&sdata->dev->dev, "MAC COMMAND received\n");
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mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC);
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if (!mac_pkt)
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goto fail;
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mac_pkt->skb = skb_get(skb);
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mac_pkt->sdata = sdata;
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list_add_tail(&mac_pkt->node, &sdata->local->rx_mac_cmd_list);
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queue_work(sdata->local->mac_wq, &sdata->local->rx_mac_cmd_work);
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return NET_RX_SUCCESS;
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case IEEE802154_FC_TYPE_ACK:
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goto fail;
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case IEEE802154_FC_TYPE_DATA:
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@ -403,6 +403,7 @@ void mac802154_beacon_worker(struct work_struct *work)
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struct cfg802154_beacon_request *beacon_req;
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struct ieee802154_sub_if_data *sdata;
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struct wpan_dev *wpan_dev;
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u8 interval;
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int ret;
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rcu_read_lock();
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@ -423,6 +424,7 @@ void mac802154_beacon_worker(struct work_struct *work)
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}
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wpan_dev = beacon_req->wpan_dev;
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interval = beacon_req->interval;
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rcu_read_unlock();
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@ -432,8 +434,9 @@ void mac802154_beacon_worker(struct work_struct *work)
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dev_err(&sdata->dev->dev,
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"Beacon could not be transmitted (%d)\n", ret);
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queue_delayed_work(local->mac_wq, &local->beacon_work,
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local->beacon_interval);
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if (interval < IEEE802154_ACTIVE_SCAN_DURATION)
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queue_delayed_work(local->mac_wq, &local->beacon_work,
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local->beacon_interval);
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}
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int mac802154_stop_beacons_locked(struct ieee802154_local *local,
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@ -488,13 +491,17 @@ int mac802154_send_beacons_locked(struct ieee802154_sub_if_data *sdata,
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local->beacon.mhr.source.pan_id = request->wpan_dev->pan_id;
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local->beacon.mhr.source.extended_addr = request->wpan_dev->extended_addr;
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local->beacon.mac_pl.beacon_order = request->interval;
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local->beacon.mac_pl.superframe_order = request->interval;
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if (request->interval <= IEEE802154_MAX_SCAN_DURATION)
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local->beacon.mac_pl.superframe_order = request->interval;
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local->beacon.mac_pl.final_cap_slot = 0xf;
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local->beacon.mac_pl.battery_life_ext = 0;
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/* TODO: Fill this field depending on the coordinator capacity */
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/* TODO: Fill this field with the coordinator situation in the network */
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local->beacon.mac_pl.pan_coordinator = 1;
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local->beacon.mac_pl.assoc_permit = 1;
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if (request->interval == IEEE802154_ACTIVE_SCAN_DURATION)
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return 0;
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/* Start the beacon work */
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local->beacon_interval =
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mac802154_scan_get_channel_time(request->interval,
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