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@xxxxxxxxxxx> --- include/net/ieee802154_netdev.h | 2 + net/ieee802154/header_ops.c | 13 ++++++ net/mac802154/ieee802154_i.h | 20 ++++++++++ net/mac802154/main.c | 2 + net/mac802154/rx.c | 70 ++++++++++++++++++++++++++++++++- net/mac802154/scan.c | 15 +++++-- 6 files changed, 117 insertions(+), 5 deletions(-) diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h index 257c9b2e9c9a..063313df447d 100644 --- a/include/net/ieee802154_netdev.h +++ b/include/net/ieee802154_netdev.h @@ -193,6 +193,8 @@ int ieee802154_beacon_push(struct sk_buff *skb, struct ieee802154_beacon_frame *beacon); int ieee802154_mac_cmd_push(struct sk_buff *skb, void *frame, const void *pl, unsigned int pl_len); +int ieee802154_mac_cmd_pl_pull(struct sk_buff *skb, + struct ieee802154_mac_cmd_pl *mac_pl); int ieee802154_max_payload(const struct ieee802154_hdr *hdr); diff --git a/net/ieee802154/header_ops.c b/net/ieee802154/header_ops.c index a5ff1017a4b2..41a556be1017 100644 --- a/net/ieee802154/header_ops.c +++ b/net/ieee802154/header_ops.c @@ -307,6 +307,19 @@ ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr) } EXPORT_SYMBOL_GPL(ieee802154_hdr_pull); +int ieee802154_mac_cmd_pl_pull(struct sk_buff *skb, + struct ieee802154_mac_cmd_pl *mac_pl) +{ + if (!pskb_may_pull(skb, sizeof(*mac_pl))) + return -EINVAL; + + memcpy(mac_pl, skb->data, sizeof(*mac_pl)); + skb_pull(skb, sizeof(*mac_pl)); + + return 0; +} +EXPORT_SYMBOL_GPL(ieee802154_mac_cmd_pl_pull); + int ieee802154_hdr_peek_addrs(const struct sk_buff *skb, struct ieee802154_hdr *hdr) { diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h index 7bfd5411a164..c347ec9ff8c9 100644 --- a/net/mac802154/ieee802154_i.h +++ b/net/mac802154/ieee802154_i.h @@ -71,6 +71,8 @@ struct ieee802154_local { /* Asynchronous tasks */ struct list_head rx_beacon_list; struct work_struct rx_beacon_work; + struct list_head rx_mac_cmd_list; + struct work_struct rx_mac_cmd_work; bool started; bool suspended; @@ -155,6 +157,22 @@ ieee802154_sdata_running(struct ieee802154_sub_if_data *sdata) return test_bit(SDATA_STATE_RUNNING, &sdata->state); } +static inline int ieee802154_get_mac_cmd(struct sk_buff *skb, u8 *mac_cmd) +{ + struct ieee802154_mac_cmd_pl mac_pl; + int ret; + + if (mac_cb(skb)->type != IEEE802154_FC_TYPE_MAC_CMD) + return -EINVAL; + + ret = ieee802154_mac_cmd_pl_pull(skb, &mac_pl); + if (ret) + return ret; + + *mac_cmd = mac_pl.cmd_id; + return 0; +} + extern struct ieee802154_mlme_ops mac802154_mlme_wpan; void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb); @@ -276,6 +294,8 @@ static inline bool mac802154_is_beaconing(struct ieee802154_local *local) return test_bit(IEEE802154_IS_BEACONING, &local->ongoing); } +void mac802154_rx_mac_cmd_worker(struct work_struct *work); + /* interface handling */ int ieee802154_iface_init(void); void ieee802154_iface_exit(void); diff --git a/net/mac802154/main.c b/net/mac802154/main.c index ee23e234b998..357ece67432b 100644 --- a/net/mac802154/main.c +++ b/net/mac802154/main.c @@ -90,6 +90,7 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) INIT_LIST_HEAD(&local->interfaces); INIT_LIST_HEAD(&local->rx_beacon_list); + INIT_LIST_HEAD(&local->rx_mac_cmd_list); mutex_init(&local->iflist_mtx); tasklet_setup(&local->tasklet, ieee802154_tasklet_handler); @@ -100,6 +101,7 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) INIT_DELAYED_WORK(&local->scan_work, mac802154_scan_worker); INIT_WORK(&local->rx_beacon_work, mac802154_rx_beacon_worker); INIT_DELAYED_WORK(&local->beacon_work, mac802154_beacon_worker); + INIT_WORK(&local->rx_mac_cmd_work, mac802154_rx_mac_cmd_worker); /* init supported flags with 802.15.4 default ranges */ phy->supported.max_minbe = 8; diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c index da0628ee3c89..e2434b4fe514 100644 --- a/net/mac802154/rx.c +++ b/net/mac802154/rx.c @@ -47,6 +47,62 @@ void mac802154_rx_beacon_worker(struct work_struct *work) kfree(mac_pkt); } +static bool mac802154_should_answer_beacon_req(struct ieee802154_local *local) +{ + struct cfg802154_beacon_request *beacon_req; + unsigned int interval; + + rcu_read_lock(); + beacon_req = rcu_dereference(local->beacon_req); + if (!beacon_req) { + rcu_read_unlock(); + return false; + } + + interval = beacon_req->interval; + rcu_read_unlock(); + + if (!mac802154_is_beaconing(local)) + return false; + + return interval == IEEE802154_ACTIVE_SCAN_DURATION; +} + +void mac802154_rx_mac_cmd_worker(struct work_struct *work) +{ + struct ieee802154_local *local = + container_of(work, struct ieee802154_local, rx_mac_cmd_work); + struct cfg802154_mac_pkt *mac_pkt; + u8 mac_cmd; + int rc; + + mac_pkt = list_first_entry_or_null(&local->rx_mac_cmd_list, + struct cfg802154_mac_pkt, node); + if (!mac_pkt) + return; + + rc = ieee802154_get_mac_cmd(mac_pkt->skb, &mac_cmd); + if (rc) + goto out; + + switch (mac_cmd) { + case IEEE802154_CMD_BEACON_REQ: + dev_dbg(&mac_pkt->sdata->dev->dev, "processing BEACON REQ\n"); + if (!mac802154_should_answer_beacon_req(local)) + break; + + queue_delayed_work(local->mac_wq, &local->beacon_work, 0); + break; + default: + break; + } + +out: + list_del(&mac_pkt->node); + kfree_skb(mac_pkt->skb); + kfree(mac_pkt); +} + static int ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata, struct sk_buff *skb, const struct ieee802154_hdr *hdr) @@ -140,8 +196,20 @@ ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata, list_add_tail(&mac_pkt->node, &sdata->local->rx_beacon_list); queue_work(sdata->local->mac_wq, &sdata->local->rx_beacon_work); return NET_RX_SUCCESS; - case IEEE802154_FC_TYPE_ACK: + case IEEE802154_FC_TYPE_MAC_CMD: + dev_dbg(&sdata->dev->dev, "MAC COMMAND received\n"); + mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC); + if (!mac_pkt) + goto fail; + + mac_pkt->skb = skb_get(skb); + mac_pkt->sdata = sdata; + list_add_tail(&mac_pkt->node, &sdata->local->rx_mac_cmd_list); + queue_work(sdata->local->mac_wq, &sdata->local->rx_mac_cmd_work); + return NET_RX_SUCCESS; + + case IEEE802154_FC_TYPE_ACK: goto fail; case IEEE802154_FC_TYPE_DATA: diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c index 201bfc567a43..618553a2e026 100644 --- a/net/mac802154/scan.c +++ b/net/mac802154/scan.c @@ -403,6 +403,7 @@ void mac802154_beacon_worker(struct work_struct *work) struct cfg802154_beacon_request *beacon_req; struct ieee802154_sub_if_data *sdata; struct wpan_dev *wpan_dev; + u8 interval; int ret; rcu_read_lock(); @@ -423,6 +424,7 @@ void mac802154_beacon_worker(struct work_struct *work) } wpan_dev = beacon_req->wpan_dev; + interval = beacon_req->interval; rcu_read_unlock(); @@ -432,8 +434,9 @@ void mac802154_beacon_worker(struct work_struct *work) dev_err(&sdata->dev->dev, "Beacon could not be transmitted (%d)\n", ret); - queue_delayed_work(local->mac_wq, &local->beacon_work, - local->beacon_interval); + if (interval < IEEE802154_ACTIVE_SCAN_DURATION) + queue_delayed_work(local->mac_wq, &local->beacon_work, + local->beacon_interval); } int mac802154_stop_beacons_locked(struct ieee802154_local *local, @@ -488,13 +491,17 @@ int mac802154_send_beacons_locked(struct ieee802154_sub_if_data *sdata, local->beacon.mhr.source.pan_id = request->wpan_dev->pan_id; local->beacon.mhr.source.extended_addr = request->wpan_dev->extended_addr; local->beacon.mac_pl.beacon_order = request->interval; - local->beacon.mac_pl.superframe_order = request->interval; + if (request->interval <= IEEE802154_MAX_SCAN_DURATION) + local->beacon.mac_pl.superframe_order = request->interval; local->beacon.mac_pl.final_cap_slot = 0xf; local->beacon.mac_pl.battery_life_ext = 0; - /* TODO: Fill this field depending on the coordinator capacity */ + /* TODO: Fill this field with the coordinator situation in the network */ local->beacon.mac_pl.pan_coordinator = 1; local->beacon.mac_pl.assoc_permit = 1; + if (request->interval == IEEE802154_ACTIVE_SCAN_DURATION) + return 0; + /* Start the beacon work */ local->beacon_interval = mac802154_scan_get_channel_time(request->interval, -- 2.34.1