ieee802154: Add support for user scanning requests
The ieee802154 layer should be able to scan a set of channels in order to look for beacons advertizing PANs. Supporting this involves adding two user commands: triggering scans and aborting scans. The user should also be notified when a new beacon is received and also upon scan termination. A scan request structure is created to list the requirements and to be accessed asynchronously when changing channels or receiving beacons. Mac layers may now implement the ->trigger_scan() and ->abort_scan() hooks. 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/20230103165644.432209-2-miquel.raynal@bootlin.com Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
This commit is contained in:
Miquel Raynal
Stefan Schmidt
parent
d8b879c00f
commit
ed3557c947
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@ -44,6 +44,9 @@
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#define IEEE802154_SHORT_ADDR_LEN 2
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#define IEEE802154_PAN_ID_LEN 2
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/* Duration in superframe order */
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#define IEEE802154_MAX_SCAN_DURATION 14
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#define IEEE802154_ACTIVE_SCAN_DURATION 15
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#define IEEE802154_LIFS_PERIOD 40
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#define IEEE802154_SIFS_PERIOD 12
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#define IEEE802154_MAX_SIFS_FRAME_SIZE 18
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@ -18,6 +18,7 @@
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struct wpan_phy;
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struct wpan_phy_cca;
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struct cfg802154_scan_request;
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#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
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struct ieee802154_llsec_device_key;
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@ -67,6 +68,10 @@ struct cfg802154_ops {
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struct wpan_dev *wpan_dev, bool mode);
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int (*set_ackreq_default)(struct wpan_phy *wpan_phy,
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struct wpan_dev *wpan_dev, bool ackreq);
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int (*trigger_scan)(struct wpan_phy *wpan_phy,
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struct cfg802154_scan_request *request);
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int (*abort_scan)(struct wpan_phy *wpan_phy,
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struct wpan_dev *wpan_dev);
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#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
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void (*get_llsec_table)(struct wpan_phy *wpan_phy,
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struct wpan_dev *wpan_dev,
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@ -278,6 +283,26 @@ struct ieee802154_coord_desc {
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bool gts_permit;
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};
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/**
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* struct cfg802154_scan_request - Scan request
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*
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* @type: type of scan to be performed
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* @page: page on which to perform the scan
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* @channels: channels in te %page to be scanned
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* @duration: time spent on each channel, calculated with:
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* aBaseSuperframeDuration * (2 ^ duration + 1)
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* @wpan_dev: the wpan device on which to perform the scan
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* @wpan_phy: the wpan phy on which to perform the scan
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*/
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struct cfg802154_scan_request {
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enum nl802154_scan_types type;
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u8 page;
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u32 channels;
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u8 duration;
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struct wpan_dev *wpan_dev;
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struct wpan_phy *wpan_phy;
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};
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struct ieee802154_llsec_key_id {
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u8 mode;
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u8 id;
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@ -73,6 +73,9 @@ enum nl802154_commands {
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NL802154_CMD_DEL_SEC_LEVEL,
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NL802154_CMD_SCAN_EVENT,
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NL802154_CMD_TRIGGER_SCAN,
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NL802154_CMD_ABORT_SCAN,
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NL802154_CMD_SCAN_DONE,
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/* add new commands above here */
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@ -134,6 +137,13 @@ enum nl802154_attrs {
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NL802154_ATTR_NETNS_FD,
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NL802154_ATTR_COORDINATOR,
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NL802154_ATTR_SCAN_TYPE,
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NL802154_ATTR_SCAN_FLAGS,
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NL802154_ATTR_SCAN_CHANNELS,
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NL802154_ATTR_SCAN_PREAMBLE_CODES,
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NL802154_ATTR_SCAN_MEAN_PRF,
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NL802154_ATTR_SCAN_DURATION,
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NL802154_ATTR_SCAN_DONE_REASON,
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/* add attributes here, update the policy in nl802154.c */
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@ -259,6 +269,54 @@ enum nl802154_coord {
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NL802154_COORD_MAX,
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};
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/**
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* enum nl802154_scan_types - Scan types
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*
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* @__NL802154_SCAN_INVALID: scan type number 0 is reserved
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* @NL802154_SCAN_ED: An ED scan allows a device to obtain a measure of the peak
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* energy in each requested channel
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* @NL802154_SCAN_ACTIVE: Locate any coordinator transmitting Beacon frames using
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* a Beacon Request command
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* @NL802154_SCAN_PASSIVE: Locate any coordinator transmitting Beacon frames
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* @NL802154_SCAN_ORPHAN: Relocate coordinator following a loss of synchronisation
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* @NL802154_SCAN_ENHANCED_ACTIVE: Same as Active using Enhanced Beacon Request
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* command instead of Beacon Request command
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* @NL802154_SCAN_RIT_PASSIVE: Passive scan for RIT Data Request command frames
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* instead of Beacon frames
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* @NL802154_SCAN_ATTR_MAX: Maximum SCAN attribute number
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*/
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enum nl802154_scan_types {
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__NL802154_SCAN_INVALID,
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NL802154_SCAN_ED,
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NL802154_SCAN_ACTIVE,
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NL802154_SCAN_PASSIVE,
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NL802154_SCAN_ORPHAN,
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NL802154_SCAN_ENHANCED_ACTIVE,
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NL802154_SCAN_RIT_PASSIVE,
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/* keep last */
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NL802154_SCAN_ATTR_MAX,
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};
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/**
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* enum nl802154_scan_done_reasons - End of scan reasons
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*
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* @__NL802154_SCAN_DONE_REASON_INVALID: scan done reason number 0 is reserved.
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* @NL802154_SCAN_DONE_REASON_FINISHED: The scan just finished naturally after
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* going through all the requested and possible (complex) channels.
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* @NL802154_SCAN_DONE_REASON_ABORTED: The scan was aborted upon user request.
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* a Beacon Request command
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* @NL802154_SCAN_DONE_REASON_MAX: Maximum scan done reason attribute number.
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*/
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enum nl802154_scan_done_reasons {
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__NL802154_SCAN_DONE_REASON_INVALID,
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NL802154_SCAN_DONE_REASON_FINISHED,
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NL802154_SCAN_DONE_REASON_ABORTED,
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/* keep last */
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NL802154_SCAN_DONE_REASON_MAX,
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};
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/**
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* enum nl802154_cca_modes - cca modes
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*
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@ -221,6 +221,13 @@ static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
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[NL802154_ATTR_COORDINATOR] = { .type = NLA_NESTED },
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[NL802154_ATTR_SCAN_TYPE] = { .type = NLA_U8 },
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[NL802154_ATTR_SCAN_CHANNELS] = { .type = NLA_U32 },
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[NL802154_ATTR_SCAN_PREAMBLE_CODES] = { .type = NLA_U64 },
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[NL802154_ATTR_SCAN_MEAN_PRF] = { .type = NLA_U8 },
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[NL802154_ATTR_SCAN_DURATION] = { .type = NLA_U8 },
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[NL802154_ATTR_SCAN_DONE_REASON] = { .type = NLA_U8 },
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#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
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[NL802154_ATTR_SEC_ENABLED] = { .type = NLA_U8, },
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[NL802154_ATTR_SEC_OUT_LEVEL] = { .type = NLA_U32, },
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@ -1384,6 +1391,203 @@ int nl802154_scan_event(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev,
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}
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EXPORT_SYMBOL_GPL(nl802154_scan_event);
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static int nl802154_trigger_scan(struct sk_buff *skb, struct genl_info *info)
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{
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struct cfg802154_registered_device *rdev = info->user_ptr[0];
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struct net_device *dev = info->user_ptr[1];
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struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
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struct wpan_phy *wpan_phy = &rdev->wpan_phy;
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struct cfg802154_scan_request *request;
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u8 type;
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int err;
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/* Monitors are not allowed to perform scans */
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if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR)
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return -EPERM;
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request = kzalloc(sizeof(*request), GFP_KERNEL);
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if (!request)
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return -ENOMEM;
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request->wpan_dev = wpan_dev;
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request->wpan_phy = wpan_phy;
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type = nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE]);
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switch (type) {
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case NL802154_SCAN_PASSIVE:
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request->type = type;
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break;
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default:
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pr_err("Unsupported scan type: %d\n", type);
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err = -EINVAL;
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goto free_request;
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}
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if (info->attrs[NL802154_ATTR_PAGE]) {
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request->page = nla_get_u8(info->attrs[NL802154_ATTR_PAGE]);
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if (request->page > IEEE802154_MAX_PAGE) {
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pr_err("Invalid page %d > %d\n",
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request->page, IEEE802154_MAX_PAGE);
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err = -EINVAL;
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goto free_request;
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}
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} else {
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/* Use current page by default */
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request->page = wpan_phy->current_page;
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}
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if (info->attrs[NL802154_ATTR_SCAN_CHANNELS]) {
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request->channels = nla_get_u32(info->attrs[NL802154_ATTR_SCAN_CHANNELS]);
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if (request->channels >= BIT(IEEE802154_MAX_CHANNEL + 1)) {
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pr_err("Invalid channels bitfield %x ≥ %lx\n",
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request->channels,
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BIT(IEEE802154_MAX_CHANNEL + 1));
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err = -EINVAL;
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goto free_request;
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}
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} else {
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/* Scan all supported channels by default */
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request->channels = wpan_phy->supported.channels[request->page];
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}
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if (info->attrs[NL802154_ATTR_SCAN_PREAMBLE_CODES] ||
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info->attrs[NL802154_ATTR_SCAN_MEAN_PRF]) {
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pr_err("Preamble codes and mean PRF not supported yet\n");
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err = -EINVAL;
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goto free_request;
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}
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if (info->attrs[NL802154_ATTR_SCAN_DURATION]) {
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request->duration = nla_get_u8(info->attrs[NL802154_ATTR_SCAN_DURATION]);
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if (request->duration > IEEE802154_MAX_SCAN_DURATION) {
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pr_err("Duration is out of range\n");
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err = -EINVAL;
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goto free_request;
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}
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} else {
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/* Use maximum duration order by default */
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request->duration = IEEE802154_MAX_SCAN_DURATION;
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}
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if (wpan_dev->netdev)
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dev_hold(wpan_dev->netdev);
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err = rdev_trigger_scan(rdev, request);
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if (err) {
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pr_err("Failure starting scanning (%d)\n", err);
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goto free_device;
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}
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return 0;
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free_device:
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if (wpan_dev->netdev)
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dev_put(wpan_dev->netdev);
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free_request:
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kfree(request);
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return err;
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}
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static int nl802154_prep_scan_msg(struct sk_buff *msg,
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struct cfg802154_registered_device *rdev,
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struct wpan_dev *wpan_dev, u32 portid,
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u32 seq, int flags, u8 cmd, u8 arg)
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{
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void *hdr;
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hdr = nl802154hdr_put(msg, portid, seq, flags, cmd);
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if (!hdr)
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return -ENOBUFS;
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if (nla_put_u32(msg, NL802154_ATTR_WPAN_PHY, rdev->wpan_phy_idx))
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goto nla_put_failure;
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if (wpan_dev->netdev &&
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nla_put_u32(msg, NL802154_ATTR_IFINDEX, wpan_dev->netdev->ifindex))
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goto nla_put_failure;
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if (nla_put_u64_64bit(msg, NL802154_ATTR_WPAN_DEV,
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wpan_dev_id(wpan_dev), NL802154_ATTR_PAD))
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goto nla_put_failure;
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if (cmd == NL802154_CMD_SCAN_DONE &&
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nla_put_u8(msg, NL802154_ATTR_SCAN_DONE_REASON, arg))
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goto nla_put_failure;
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genlmsg_end(msg, hdr);
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return 0;
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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static int nl802154_send_scan_msg(struct cfg802154_registered_device *rdev,
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struct wpan_dev *wpan_dev, u8 cmd, u8 arg)
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{
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struct sk_buff *msg;
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int ret;
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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ret = nl802154_prep_scan_msg(msg, rdev, wpan_dev, 0, 0, 0, cmd, arg);
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if (ret < 0) {
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nlmsg_free(msg);
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return ret;
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}
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return genlmsg_multicast_netns(&nl802154_fam,
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wpan_phy_net(&rdev->wpan_phy), msg, 0,
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NL802154_MCGRP_SCAN, GFP_KERNEL);
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}
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int nl802154_scan_started(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev)
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{
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struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(wpan_phy);
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int err;
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/* Ignore errors when there are no listeners */
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err = nl802154_send_scan_msg(rdev, wpan_dev, NL802154_CMD_TRIGGER_SCAN, 0);
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if (err == -ESRCH)
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err = 0;
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return err;
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}
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EXPORT_SYMBOL_GPL(nl802154_scan_started);
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int nl802154_scan_done(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev,
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enum nl802154_scan_done_reasons reason)
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{
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struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(wpan_phy);
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int err;
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/* Ignore errors when there are no listeners */
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err = nl802154_send_scan_msg(rdev, wpan_dev, NL802154_CMD_SCAN_DONE, reason);
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if (err == -ESRCH)
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err = 0;
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if (wpan_dev->netdev)
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dev_put(wpan_dev->netdev);
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return err;
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}
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EXPORT_SYMBOL_GPL(nl802154_scan_done);
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static int nl802154_abort_scan(struct sk_buff *skb, struct genl_info *info)
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{
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struct cfg802154_registered_device *rdev = info->user_ptr[0];
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struct net_device *dev = info->user_ptr[1];
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struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
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/* Resources are released in the notification helper above */
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return rdev_abort_scan(rdev, wpan_dev);
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}
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#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
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static const struct nla_policy nl802154_dev_addr_policy[NL802154_DEV_ADDR_ATTR_MAX + 1] = {
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[NL802154_DEV_ADDR_ATTR_PAN_ID] = { .type = NLA_U16 },
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@ -2474,6 +2678,22 @@ static const struct genl_ops nl802154_ops[] = {
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.internal_flags = NL802154_FLAG_NEED_NETDEV |
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NL802154_FLAG_NEED_RTNL,
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},
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{
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.cmd = NL802154_CMD_TRIGGER_SCAN,
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.doit = nl802154_trigger_scan,
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.flags = GENL_ADMIN_PERM,
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.internal_flags = NL802154_FLAG_NEED_NETDEV |
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NL802154_FLAG_CHECK_NETDEV_UP |
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NL802154_FLAG_NEED_RTNL,
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},
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{
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.cmd = NL802154_CMD_ABORT_SCAN,
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.doit = nl802154_abort_scan,
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.flags = GENL_ADMIN_PERM,
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.internal_flags = NL802154_FLAG_NEED_NETDEV |
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NL802154_FLAG_CHECK_NETDEV_UP |
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NL802154_FLAG_NEED_RTNL,
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},
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#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
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{
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.cmd = NL802154_CMD_SET_SEC_PARAMS,
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@ -6,5 +6,8 @@ int nl802154_init(void);
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void nl802154_exit(void);
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int nl802154_scan_event(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev,
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struct ieee802154_coord_desc *desc);
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int nl802154_scan_started(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev);
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int nl802154_scan_done(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev,
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enum nl802154_scan_done_reasons reason);
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#endif /* __IEEE802154_NL802154_H */
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@ -209,6 +209,34 @@ rdev_set_ackreq_default(struct cfg802154_registered_device *rdev,
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return ret;
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}
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static inline int rdev_trigger_scan(struct cfg802154_registered_device *rdev,
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struct cfg802154_scan_request *request)
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{
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int ret;
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if (!rdev->ops->trigger_scan)
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return -EOPNOTSUPP;
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trace_802154_rdev_trigger_scan(&rdev->wpan_phy, request);
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ret = rdev->ops->trigger_scan(&rdev->wpan_phy, request);
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trace_802154_rdev_return_int(&rdev->wpan_phy, ret);
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return ret;
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}
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static inline int rdev_abort_scan(struct cfg802154_registered_device *rdev,
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struct wpan_dev *wpan_dev)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (!rdev->ops->abort_scan)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
trace_802154_rdev_abort_scan(&rdev->wpan_phy, wpan_dev);
|
||||
ret = rdev->ops->abort_scan(&rdev->wpan_phy, wpan_dev);
|
||||
trace_802154_rdev_return_int(&rdev->wpan_phy, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
|
||||
/* TODO this is already a nl802154, so move into ieee802154 */
|
||||
static inline void
|
||||
|
|
|
|||
|
|
@ -295,6 +295,46 @@ TRACE_EVENT(802154_rdev_set_ackreq_default,
|
|||
WPAN_DEV_PR_ARG, BOOL_TO_STR(__entry->ackreq))
|
||||
);
|
||||
|
||||
TRACE_EVENT(802154_rdev_trigger_scan,
|
||||
TP_PROTO(struct wpan_phy *wpan_phy,
|
||||
struct cfg802154_scan_request *request),
|
||||
TP_ARGS(wpan_phy, request),
|
||||
TP_STRUCT__entry(
|
||||
WPAN_PHY_ENTRY
|
||||
__field(u8, page)
|
||||
__field(u32, channels)
|
||||
__field(u8, duration)
|
||||
),
|
||||
TP_fast_assign(
|
||||
WPAN_PHY_ASSIGN;
|
||||
__entry->page = request->page;
|
||||
__entry->channels = request->channels;
|
||||
__entry->duration = request->duration;
|
||||
),
|
||||
TP_printk(WPAN_PHY_PR_FMT ", scan, page: %d, channels: %x, duration %d",
|
||||
WPAN_PHY_PR_ARG, __entry->page, __entry->channels, __entry->duration)
|
||||
);
|
||||
|
||||
DECLARE_EVENT_CLASS(802154_wdev_template,
|
||||
TP_PROTO(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev),
|
||||
TP_ARGS(wpan_phy, wpan_dev),
|
||||
TP_STRUCT__entry(
|
||||
WPAN_PHY_ENTRY
|
||||
WPAN_DEV_ENTRY
|
||||
),
|
||||
TP_fast_assign(
|
||||
WPAN_PHY_ASSIGN;
|
||||
WPAN_DEV_ASSIGN;
|
||||
),
|
||||
TP_printk(WPAN_PHY_PR_FMT ", " WPAN_DEV_PR_FMT,
|
||||
WPAN_PHY_PR_ARG, WPAN_DEV_PR_ARG)
|
||||
);
|
||||
|
||||
DEFINE_EVENT(802154_wdev_template, 802154_rdev_abort_scan,
|
||||
TP_PROTO(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev),
|
||||
TP_ARGS(wpan_phy, wpan_dev)
|
||||
);
|
||||
|
||||
TRACE_EVENT(802154_rdev_return_int,
|
||||
TP_PROTO(struct wpan_phy *wpan_phy, int ret),
|
||||
TP_ARGS(wpan_phy, ret),
|
||||
|
|
|
|||
Loading…
Reference in New Issue