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Message-Id: <20220117115440.60296-39-miquel.raynal@bootlin.com>
Date: Mon, 17 Jan 2022 12:54:37 +0100
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: netdev@...r.kernel.org, linux-wireless@...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>,
Michael Hennerich <michael.hennerich@...log.com>,
Jakub Kicinski <kuba@...nel.org>,
Varka Bhadram <varkabhadram@...il.com>,
Xue Liu <liuxuenetmail@...il.com>, Alan Ott <alan@...nal11.us>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v3 38/41] net: mac802154: Add support for active scans
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 | 14 +++++++-
net/ieee802154/header_ops.c | 25 +++++++++++++++
net/mac802154/ieee802154_i.h | 1 +
net/mac802154/scan.c | 57 +++++++++++++++++++++++++++++++--
4 files changed, 94 insertions(+), 3 deletions(-)
diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h
index f7716aeec93b..1bf1a4e508a2 100644
--- a/include/net/ieee802154_netdev.h
+++ b/include/net/ieee802154_netdev.h
@@ -58,6 +58,11 @@ struct ieee802154_beacon_hdr {
#endif
} __packed;
+struct ieee802154_mac_cmd_pl {
+ u8 cmd_id;
+ /* TODO: content depending on the cmd_id */
+} __packed;
+
struct ieee802154_sechdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
u8 level:3,
@@ -139,6 +144,11 @@ struct ieee802154_hdr {
struct ieee802154_sechdr sec;
};
+struct ieee802154_beacon_req_frame {
+ struct ieee802154_hdr mhr;
+ struct ieee802154_mac_cmd_pl mac_pl;
+};
+
struct ieee802154_beacon_frame {
struct ieee802154_hdr mhr;
struct ieee802154_beacon_hdr mac_pl;
@@ -169,7 +179,9 @@ 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 a beacon_req or a beacon frame into an skb */
+int ieee802154_beacon_req_push(struct sk_buff *skb,
+ struct ieee802154_beacon_req_frame *breq);
int ieee802154_beacon_push(struct sk_buff *skb,
struct ieee802154_beacon_frame *beacon);
diff --git a/net/ieee802154/header_ops.c b/net/ieee802154/header_ops.c
index bab710aa36f9..c31a9e429a14 100644
--- a/net/ieee802154/header_ops.c
+++ b/net/ieee802154/header_ops.c
@@ -121,6 +121,31 @@ ieee802154_hdr_push(struct sk_buff *skb, struct ieee802154_hdr *hdr)
}
EXPORT_SYMBOL_GPL(ieee802154_hdr_push);
+int ieee802154_beacon_req_push(struct sk_buff *skb,
+ struct ieee802154_beacon_req_frame *breq)
+{
+ struct ieee802154_mac_cmd_pl *mac_pl = &breq->mac_pl;
+ struct ieee802154_hdr *mhr = &breq->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));
+
+ crc = crc_ccitt(0, skb->data, skb->len);
+ put_unaligned_le16(crc, skb_put(skb, 2));
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ieee802154_beacon_req_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 514446c1f815..0b1bcbab1ff3 100644
--- a/net/mac802154/ieee802154_i.h
+++ b/net/mac802154/ieee802154_i.h
@@ -56,6 +56,7 @@ struct ieee802154_local {
struct cfg802154_scan_request __rcu *scan_req;
struct ieee802154_sub_if_data __rcu *scan_sdata;
struct delayed_work scan_work;
+ struct ieee802154_beacon_req_frame beacon_req;
/* Beacons handling */
bool ongoing_beacons_request;
diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c
index d9b54b35660a..71a845e3e76d 100644
--- a/net/mac802154/scan.c
+++ b/net/mac802154/scan.c
@@ -19,10 +19,15 @@
#define IEEE802154_BEACON_MHR_SZ 13
#define IEEE802154_BEACON_PL_SZ 4
+#define IEEE802154_BEACON_REQ_MHR_SZ 7
+#define IEEE802154_BEACON_REQ_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_BEACON_REQ_SKB_SZ (IEEE802154_BEACON_REQ_MHR_SZ + \
+ IEEE802154_BEACON_REQ_PL_SZ + \
+ IEEE802154_CRC_SZ)
static bool mac802154_check_promiscuous(struct ieee802154_local *local)
{
@@ -112,6 +117,48 @@ static unsigned int mac802154_scan_get_channel_time(u8 duration_order,
(BIT(duration_order) + 1));
}
+static int mac802154_scan_prepare_beacon_req(struct ieee802154_local *local)
+{
+ memset(&local->beacon_req, 0, sizeof(local->beacon_req));
+ local->beacon_req.mhr.fc.type = IEEE802154_FC_TYPE_MAC_CMD;
+ local->beacon_req.mhr.fc.dest_addr_mode = IEEE802154_SHORT_ADDRESSING;
+ local->beacon_req.mhr.fc.version = IEEE802154_2003_STD;
+ local->beacon_req.mhr.fc.source_addr_mode = IEEE802154_NO_ADDRESSING;
+ local->beacon_req.mhr.dest.mode = IEEE802154_ADDR_SHORT;
+ local->beacon_req.mhr.dest.pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
+ local->beacon_req.mhr.dest.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
+ local->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_BEACON_REQ_SKB_SZ, GFP_KERNEL);
+ if (!skb)
+ return -ENOBUFS;
+
+ sdata = rcu_dereference_protected(local->scan_sdata,
+ lockdep_is_held(&local->scan_lock));
+ skb->dev = sdata->dev;
+
+ ret = ieee802154_beacon_req_push(skb, &local->beacon_req);
+ if (ret) {
+ kfree_skb(skb);
+ return ret;
+ }
+
+ ieee802154_mlme_tx(local, skb);
+
+ return 0;
+}
+
void mac802154_scan_work(struct work_struct *work)
{
struct ieee802154_local *local =
@@ -157,6 +204,9 @@ void mac802154_scan_work(struct work_struct *work)
ieee802154_configure_durations(local->phy);
} while (ret);
+ if (scan_req->type == NL802154_SCAN_ACTIVE)
+ mac802154_transmit_beacon_req_locked(local);
+
queue_work:
scan_duration = mac802154_scan_get_channel_time(scan_req->duration,
local->phy->symbol_duration);
@@ -183,8 +233,8 @@ int mac802154_trigger_scan_locked(struct ieee802154_sub_if_data *sdata,
if (mac802154_scan_is_ongoing(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 */
@@ -197,6 +247,9 @@ int mac802154_trigger_scan_locked(struct ieee802154_sub_if_data *sdata,
else
local->scan_addr = cpu_to_le64(get_unaligned_be64(sdata->dev->dev_addr));
+ if (request->type == NL802154_SCAN_ACTIVE)
+ mac802154_scan_prepare_beacon_req(local);
+
local->scan_channel_idx = -1;
atomic_set(&local->scanning, 1);
--
2.27.0
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