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mac802154: Handle active scanning

Browse source 
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@qorvo.com>
Signed-off-by: David Girault <david.girault@qorvo.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230310145346.1397068-3-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
This commit is contained in:
Miquel Raynal 2023-03-10 15:53:44 +01:00 committed by Stefan Schmidt
parent b886642641
commit e2c3e6f53a
4 changed files with 92 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

18
include/net/ieee802154_netdev.h
View file

@ -74,6 +74,10 @@ 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,
@ -149,6 +153,16 @@ 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
@ -174,9 +188,11 @@ 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);

23
net/ieee802154/header_ops.c
View file

@ -120,6 +120,29 @@ 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;
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);
return 0;
}
EXPORT_SYMBOL_GPL(ieee802154_mac_cmd_push);
int ieee802154_beacon_push(struct sk_buff *skb,
struct ieee802154_beacon_frame *beacon)
{

1
net/mac802154/ieee802154_i.h
View file

@ -58,6 +58,7 @@ struct ieee802154_local {
/* Scanning */
u8 scan_page;
u8 scan_channel;
struct ieee802154_beacon_req_frame scan_beacon_req;
struct cfg802154_scan_request __rcu *scan_req;
struct delayed_work scan_work;

53
net/mac802154/scan.c
View file

@ -18,8 +18,12 @@
#define IEEE802154_BEACON_MHR_SZ 13
#define IEEE802154_BEACON_PL_SZ 4
#define IEEE802154_MAC_CMD_MHR_SZ 23
#define IEEE802154_MAC_CMD_PL_SZ 1
#define IEEE802154_BEACON_SKB_SZ (IEEE802154_BEACON_MHR_SZ + \
IEEE802154_BEACON_PL_SZ)
#define IEEE802154_MAC_CMD_SKB_SZ (IEEE802154_MAC_CMD_MHR_SZ + \
IEEE802154_MAC_CMD_PL_SZ)
/* mac802154_scan_cleanup_locked() must be called upon scan completion or abort.
* - Completions are asynchronous, not locked by the rtnl and decided by the
@ -131,6 +135,42 @@ static int mac802154_scan_find_next_chan(struct ieee802154_local *local,
return 0;
}
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(struct ieee802154_local *local,
struct ieee802154_sub_if_data *sdata)
{
struct sk_buff *skb;
int ret;
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 =
@ -206,6 +246,13 @@ void mac802154_scan_worker(struct work_struct *work)
goto end_scan;
}
if (scan_req->type == NL802154_SCAN_ACTIVE) {
ret = mac802154_transmit_beacon_req(local, sdata);
if (ret)
dev_err(&sdata->dev->dev,
"Error when transmitting beacon request (%d)\n", ret);
}
ieee802154_configure_durations(wpan_phy, page, channel);
scan_duration = mac802154_scan_get_channel_time(scan_req_duration,
wpan_phy->symbol_duration);
@ -231,8 +278,8 @@ 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 */
@ -247,6 +294,8 @@ int mac802154_trigger_scan_locked(struct ieee802154_sub_if_data *sdata,
local->scan_page = request->page;
local->scan_channel = -1;
set_bit(IEEE802154_IS_SCANNING, &local->ongoing);
if (request->type == NL802154_SCAN_ACTIVE)
mac802154_scan_prepare_beacon_req(local);
nl802154_scan_started(request->wpan_phy, request->wpan_dev);