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Date: Fri, 1 Jul 2022 16:30:46 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Alexander Aring <alex.aring@...il.com>,
Stefan Schmidt <stefan@...enfreihafen.org>,
linux-wpan@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
David Girault <david.girault@...vo.com>,
Romuald Despres <romuald.despres@...vo.com>,
Frederic Blain <frederic.blain@...vo.com>,
Nicolas Schodet <nico@...fr.eu.org>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH wpan-next 14/20] net: mac802154: Handle active scanning
Active scan support is based on the current passive scan support,
cheered up with beacon requests sent after every channel change.
Co-developed-by: David Girault <david.girault@...vo.com>
Signed-off-by: David Girault <david.girault@...vo.com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
include/net/ieee802154_netdev.h | 18 ++++++++++-
net/ieee802154/header_ops.c | 27 ++++++++++++++++
net/mac802154/ieee802154_i.h | 1 +
net/mac802154/scan.c | 56 +++++++++++++++++++++++++++++++--
4 files changed, 99 insertions(+), 3 deletions(-)
diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h
index f7716aeec93b..21e7e3f66c82 100644
--- a/include/net/ieee802154_netdev.h
+++ b/include/net/ieee802154_netdev.h
@@ -58,6 +58,10 @@ struct ieee802154_beacon_hdr {
#endif
} __packed;
+struct ieee802154_mac_cmd_pl {
+ u8 cmd_id;
+} __packed;
+
struct ieee802154_sechdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
u8 level:3,
@@ -144,6 +148,16 @@ struct ieee802154_beacon_frame {
struct ieee802154_beacon_hdr mac_pl;
};
+struct ieee802154_mac_cmd_frame {
+ struct ieee802154_hdr mhr;
+ struct ieee802154_mac_cmd_pl mac_pl;
+};
+
+struct ieee802154_beacon_req_frame {
+ struct ieee802154_hdr mhr;
+ struct ieee802154_mac_cmd_pl mac_pl;
+};
+
/* pushes hdr onto the skb. fields of hdr->fc that can be calculated from
* the contents of hdr will be, and the actual value of those bits in
* hdr->fc will be ignored. this includes the INTRA_PAN bit and the frame
@@ -169,9 +183,11 @@ int ieee802154_hdr_peek_addrs(const struct sk_buff *skb,
*/
int ieee802154_hdr_peek(const struct sk_buff *skb, struct ieee802154_hdr *hdr);
-/* pushes a beacon frame into an skb */
+/* pushes/pulls various frame types into/from an skb */
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_max_payload(const struct ieee802154_hdr *hdr);
diff --git a/net/ieee802154/header_ops.c b/net/ieee802154/header_ops.c
index bab710aa36f9..795d46c7292d 100644
--- a/net/ieee802154/header_ops.c
+++ b/net/ieee802154/header_ops.c
@@ -121,6 +121,33 @@ ieee802154_hdr_push(struct sk_buff *skb, struct ieee802154_hdr *hdr)
}
EXPORT_SYMBOL_GPL(ieee802154_hdr_push);
+int ieee802154_mac_cmd_push(struct sk_buff *skb, void *f,
+ const void *pl, unsigned int pl_len)
+{
+ struct ieee802154_mac_cmd_frame *frame = f;
+ struct ieee802154_mac_cmd_pl *mac_pl = &frame->mac_pl;
+ struct ieee802154_hdr *mhr = &frame->mhr;
+ u16 crc;
+ int ret;
+
+ skb_reserve(skb, sizeof(*mhr));
+ ret = ieee802154_hdr_push(skb, mhr);
+ if (ret < 0)
+ return ret;
+
+ skb_reset_mac_header(skb);
+ skb->mac_len = ret;
+
+ skb_put_data(skb, mac_pl, sizeof(*mac_pl));
+ skb_put_data(skb, pl, pl_len);
+
+ crc = crc_ccitt(0, skb->data, skb->len);
+ put_unaligned_le16(crc, skb_put(skb, 2));
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ieee802154_mac_cmd_push);
+
int ieee802154_beacon_push(struct sk_buff *skb,
struct ieee802154_beacon_frame *beacon)
{
diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
index f70848b60469..86a384942e6f 100644
--- a/net/mac802154/ieee802154_i.h
+++ b/net/mac802154/ieee802154_i.h
@@ -58,6 +58,7 @@ struct ieee802154_local {
/* Scanning */
struct mutex scan_lock;
int scan_channel_idx;
+ struct ieee802154_beacon_req_frame scan_beacon_req;
struct cfg802154_scan_request __rcu *scan_req;
struct delayed_work scan_work;
diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c
index 3dd11ec86d06..b9bb784bf388 100644
--- a/net/mac802154/scan.c
+++ b/net/mac802154/scan.c
@@ -18,10 +18,15 @@
#define IEEE802154_BEACON_MHR_SZ 13
#define IEEE802154_BEACON_PL_SZ 4
+#define IEEE802154_MAC_CMD_MHR_SZ 7
+#define IEEE802154_MAC_CMD_PL_SZ 1
#define IEEE802154_CRC_SZ 2
#define IEEE802154_BEACON_SKB_SZ (IEEE802154_BEACON_MHR_SZ + \
IEEE802154_BEACON_PL_SZ + \
IEEE802154_CRC_SZ)
+#define IEEE802154_MAC_CMD_SKB_SZ (IEEE802154_MAC_CMD_MHR_SZ + \
+ IEEE802154_MAC_CMD_PL_SZ + \
+ IEEE802154_CRC_SZ)
static bool mac802154_check_promiscuous(struct ieee802154_local *local)
{
@@ -128,6 +133,44 @@ void mac802154_flush_queued_beacons(struct ieee802154_local *local)
}
}
+static int mac802154_scan_prepare_beacon_req(struct ieee802154_local *local)
+{
+ memset(&local->scan_beacon_req, 0, sizeof(local->scan_beacon_req));
+ local->scan_beacon_req.mhr.fc.type = IEEE802154_FC_TYPE_MAC_CMD;
+ local->scan_beacon_req.mhr.fc.dest_addr_mode = IEEE802154_SHORT_ADDRESSING;
+ local->scan_beacon_req.mhr.fc.version = IEEE802154_2003_STD;
+ local->scan_beacon_req.mhr.fc.source_addr_mode = IEEE802154_NO_ADDRESSING;
+ local->scan_beacon_req.mhr.dest.mode = IEEE802154_ADDR_SHORT;
+ local->scan_beacon_req.mhr.dest.pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
+ local->scan_beacon_req.mhr.dest.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
+ local->scan_beacon_req.mac_pl.cmd_id = IEEE802154_CMD_BEACON_REQ;
+
+ return 0;
+}
+
+static int mac802154_transmit_beacon_req_locked(struct ieee802154_local *local,
+ struct ieee802154_sub_if_data *sdata)
+{
+ struct sk_buff *skb;
+ int ret;
+
+ lockdep_assert_held(&local->scan_lock);
+
+ skb = alloc_skb(IEEE802154_MAC_CMD_SKB_SZ, GFP_KERNEL);
+ if (!skb)
+ return -ENOBUFS;
+
+ skb->dev = sdata->dev;
+
+ ret = ieee802154_mac_cmd_push(skb, &local->scan_beacon_req, NULL, 0);
+ if (ret) {
+ kfree_skb(skb);
+ return ret;
+ }
+
+ return ieee802154_mlme_tx(local, sdata, skb);
+}
+
void mac802154_scan_worker(struct work_struct *work)
{
struct ieee802154_local *local =
@@ -173,6 +216,12 @@ void mac802154_scan_worker(struct work_struct *work)
mac802154_flush_queued_beacons(local);
} while (ret);
+ if (scan_req->type == NL802154_SCAN_ACTIVE) {
+ ret = mac802154_transmit_beacon_req_locked(local, sdata);
+ if (ret)
+ pr_err("Error when transmitting beacon request (%d)\n", ret);
+ }
+
queue_work:
scan_duration = mac802154_scan_get_channel_time(scan_req->duration,
local->phy->symbol_duration);
@@ -195,13 +244,16 @@ int mac802154_trigger_scan_locked(struct ieee802154_sub_if_data *sdata,
if (mac802154_is_scanning(local))
return -EBUSY;
- /* TODO: support other scanning type */
- if (request->type != NL802154_SCAN_PASSIVE)
+ if (request->type != NL802154_SCAN_PASSIVE &&
+ request->type != NL802154_SCAN_ACTIVE)
return -EOPNOTSUPP;
/* Store scanning parameters */
rcu_assign_pointer(local->scan_req, request);
+ if (request->type == NL802154_SCAN_ACTIVE)
+ mac802154_scan_prepare_beacon_req(local);
+
/* Software scanning requires to set promiscuous mode, so we need to
* pause the Tx queue during the entire operation.
*/
--
2.34.1
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