This involves processing triggering scan requests, abort scan requests,
as well as providing information about if the last scan was finished or
not.
A scan request structure is created to list the requirements.
A netlink multicast scan group is also created for the occasion so that
listeners can only focus on scan activity.
Mac layers may now implement the ->trigger_scan() and ->abort_scan()
hooks.
Co-developed-by: David Girault <david.girault@xxxxxxxxx>
Signed-off-by: David Girault <david.girault@xxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
include/linux/ieee802154.h | 3 +
include/net/cfg802154.h | 26 +++++
include/net/nl802154.h | 49 ++++++++
net/ieee802154/core.h | 3 +
net/ieee802154/nl802154.c | 234 +++++++++++++++++++++++++++++++++++++
net/ieee802154/nl802154.h | 4 +
net/ieee802154/rdev-ops.h | 28 +++++
net/ieee802154/trace.h | 40 +++++++
8 files changed, 387 insertions(+)
diff --git a/include/linux/ieee802154.h b/include/linux/ieee802154.h
index 95c831162212..41178c87c43c 100644
--- a/include/linux/ieee802154.h
+++ b/include/linux/ieee802154.h
@@ -44,6 +44,9 @@
#define IEEE802154_SHORT_ADDR_LEN 2
#define IEEE802154_PAN_ID_LEN 2
+/* Duration in superframe order */
+#define IEEE802154_MAX_SCAN_DURATION 14
+#define IEEE802154_ACTIVE_SCAN_DURATION 15
#define IEEE802154_LIFS_PERIOD 40
#define IEEE802154_SIFS_PERIOD 12
#define IEEE802154_MAX_SIFS_FRAME_SIZE 18
diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
index 9c79feac25bf..2118bfc02d7c 100644
--- a/include/net/cfg802154.h
+++ b/include/net/cfg802154.h
@@ -66,6 +66,28 @@ struct ieee802154_pan_desc {
bool gts_permit;
};
+/**
+ * struct cfg802154_scan_req - Scan request
+ *
+ * @type: type of scan to be performed
+ * @flags: flags bitfield controlling the operation
+ * @page: page on which to perform the scan
+ * @channels: channels in te %page to be scanned
+ * @duration: time spent on each channel, calculated with:
+ * aBaseSuperframeDuration * (2 ^ duration + 1)
+ * @wpan_dev: the wpan device on which to perform the scan
+ * @wpan_phy: the wpan phy on which to perform the scan
+ */
+struct cfg802154_scan_request {
+ enum nl802154_scan_types type;
+ u32 flags;
+ u8 page;
+ u32 channels;
+ u8 duration;
+ struct wpan_dev *wpan_dev;
+ struct wpan_phy *wpan_phy;
+};
+
struct cfg802154_ops {
struct net_device * (*add_virtual_intf_deprecated)(struct wpan_phy *wpan_phy,
const char *name,
@@ -104,6 +126,10 @@ struct cfg802154_ops {
struct wpan_dev *wpan_dev, bool mode);
int (*set_ackreq_default)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev, bool ackreq);
+ int (*trigger_scan)(struct wpan_phy *wpan_phy,
+ struct cfg802154_scan_request *request);
+ int (*abort_scan)(struct wpan_phy *wpan_phy,
+ struct wpan_dev *wpan_dev);
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
void (*get_llsec_table)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev,
diff --git a/include/net/nl802154.h b/include/net/nl802154.h
index 145acb8f2509..51eca3a2b14e 100644
--- a/include/net/nl802154.h
+++ b/include/net/nl802154.h
@@ -58,6 +58,10 @@ enum nl802154_commands {
NL802154_CMD_SET_WPAN_PHY_NETNS,
+ NL802154_CMD_TRIGGER_SCAN,
+ NL802154_CMD_ABORT_SCAN,
+ NL802154_CMD_SCAN_DONE,
+
/* add new commands above here */
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
@@ -133,6 +137,11 @@ enum nl802154_attrs {
NL802154_ATTR_PID,
NL802154_ATTR_NETNS_FD,
+ NL802154_ATTR_SCAN_TYPE,
+ NL802154_ATTR_SCAN_FLAGS,
+ NL802154_ATTR_SCAN_CHANNELS,
+ NL802154_ATTR_SCAN_DURATION,
+
/* add attributes here, update the policy in nl802154.c */
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
@@ -218,6 +227,46 @@ enum nl802154_wpan_phy_capability_attr {
NL802154_CAP_ATTR_MAX = __NL802154_CAP_ATTR_AFTER_LAST - 1
};
+/**
+ * enum nl802154_scan_types - Scan types
+ *
+ * @__NL802154_SCAN_INVALID: scan type number 0 is reserved
+ * @NL802154_SCAN_ED: An ED scan allows a device to obtain a measure of the peak
+ * energy in each requested channel
+ * @NL802154_SCAN_ACTIVE: Locate any coordinator transmitting Beacon frames using
+ * a Beacon Request command
+ * @NL802154_SCAN_PASSIVE: Locate any coordinator transmitting Beacon frames
+ * @NL802154_SCAN_ORPHAN: Relocate coordinator following a loss of synchronisation
+ * @NL802154_SCAN_ENHANCED_ACTIVE: Same as Active using Enhanced Beacon Request
+ * command instead of Beacon Request command
+ * @NL802154_SCAN_RIT_PASSIVE: Passive scan for RIT Data Request command frames
+ * instead of Beacon frames
+ * @NL802154_SCAN_ATTR_MAX: Maximum SCAN attribute number
+ */
+enum nl802154_scan_types {
+ __NL802154_SCAN_INVALID,
+ NL802154_SCAN_ED,
+ NL802154_SCAN_ACTIVE,
+ NL802154_SCAN_PASSIVE,
+ NL802154_SCAN_ORPHAN,
+ NL802154_SCAN_ENHANCED_ACTIVE,
+ NL802154_SCAN_RIT_PASSIVE,
+
+ /* keep last */
+ NL802154_SCAN_ATTR_MAX,
+};
+
+/**
+ * enum nl802154_scan_flags - Scan request control flags
+ *
+ * @NL802154_SCAN_FLAG_RANDOM_ADDR: use a random MAC address for this scan (ie.
+ * a different one for every scan iteration). When the flag is set, full
+ * randomisation is assumed.
+ */
+enum nl802154_scan_flags {
+ NL802154_SCAN_FLAG_RANDOM_ADDR = BIT(0),
+};
+
/**
* enum nl802154_cca_modes - cca modes
*
diff --git a/net/ieee802154/core.h b/net/ieee802154/core.h
index 0d08d2f79ab9..9aa8f88b6920 100644
--- a/net/ieee802154/core.h
+++ b/net/ieee802154/core.h
@@ -30,6 +30,9 @@ struct cfg802154_registered_device {
unsigned int pan_entries;
unsigned int pan_generation;
+ /* scanning */
+ struct cfg802154_scan_request *scan_req;
+
/* must be last because of the way we do wpan_phy_priv(),
* and it should at least be aligned to NETDEV_ALIGN
*/
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index bd1015611a7e..99cbad1f1381 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -26,10 +26,12 @@ static struct genl_family nl802154_fam;
/* multicast groups */
enum nl802154_multicast_groups {
NL802154_MCGRP_CONFIG,
+ NL802154_MCGRP_SCAN,
};
static const struct genl_multicast_group nl802154_mcgrps[] = {
[NL802154_MCGRP_CONFIG] = { .name = "config", },
+ [NL802154_MCGRP_SCAN] = { .name = "scan", },
};
/* returns ERR_PTR values */
@@ -216,6 +218,12 @@ static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
[NL802154_ATTR_PID] = { .type = NLA_U32 },
[NL802154_ATTR_NETNS_FD] = { .type = NLA_U32 },
+
+ [NL802154_ATTR_SCAN_TYPE] = { .type = NLA_U8 },
+ [NL802154_ATTR_SCAN_FLAGS] = { .type = NLA_U32 },
+ [NL802154_ATTR_SCAN_CHANNELS] = { .type = NLA_U32 },
+ [NL802154_ATTR_SCAN_DURATION] = { .type = NLA_U8 },
+
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
[NL802154_ATTR_SEC_ENABLED] = { .type = NLA_U8, },
[NL802154_ATTR_SEC_OUT_LEVEL] = { .type = NLA_U32, },
@@ -1299,6 +1307,216 @@ static int nl802154_wpan_phy_netns(struct sk_buff *skb, struct genl_info *info)
return err;
}
+static int nl802154_trigger_scan(struct sk_buff *skb, struct genl_info *info)
+{
+ struct cfg802154_registered_device *rdev = info->user_ptr[0];
+ struct net_device *dev = info->user_ptr[1];
+ struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
+ struct wpan_phy *wpan_phy = &rdev->wpan_phy;
+ struct cfg802154_scan_request *request;
+ u8 type;
+ int err;
+
+ /* Test iftype and avoid scanning if monitor type. */
+ if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR)
+ return -EOPNOTSUPP;
+
+ request = kzalloc(sizeof(*request), GFP_KERNEL);
+ if (!request)
+ return -ENOMEM;
+
+ request->wpan_dev = wpan_dev;
+ request->wpan_phy = wpan_phy;
+
+ type = nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE]);
+ switch (type) {
+ case NL802154_SCAN_ACTIVE:
+ case NL802154_SCAN_PASSIVE:
+ request->type = type;
+ break;
+ default:
+ pr_err("Invalid scan type: %d\n", type);
+ err = -EINVAL;
+ goto free_request;
+ }
+
+ if (info->attrs[NL802154_ATTR_SCAN_FLAGS])
+ request->flags = nla_get_u32(info->attrs[NL802154_ATTR_SCAN_FLAGS]);
+
+ if (info->attrs[NL802154_ATTR_PAGE]) {
+ request->page = nla_get_u8(info->attrs[NL802154_ATTR_PAGE]);
+ if (request->page > IEEE802154_MAX_PAGE) {
+ pr_err("Invalid page %d > %d\n",
+ request->page, IEEE802154_MAX_PAGE);
+ err = -EINVAL;
+ goto free_request;
+ }
+ } else {
+ /* Use current page by default */
+ request->page = wpan_phy->current_page;
+ }
+
+ if (info->attrs[NL802154_ATTR_SCAN_CHANNELS]) {
+ request->channels = nla_get_u32(info->attrs[NL802154_ATTR_SCAN_CHANNELS]);
+ if (request->channels >= BIT(IEEE802154_MAX_CHANNEL + 1)) {
+ pr_err("Invalid channels bitfield %x ≥ %lx\n",
+ request->channels,
+ BIT(IEEE802154_MAX_CHANNEL + 1));
+ err = -EINVAL;
+ goto free_request;
+ }
+ } else {
+ /* Scan all supported channels by default */
+ request->channels = cfg802154_get_supported_chans(wpan_phy,
+ request->page);
+ }
+
+ if (info->attrs[NL802154_ATTR_SCAN_DURATION]) {
+ request->duration = nla_get_u8(info->attrs[NL802154_ATTR_SCAN_DURATION]);
+ if (request->duration > IEEE802154_MAX_SCAN_DURATION) {
+ pr_err("Duration is out of range\n");
+ err = -EINVAL;
+ goto free_request;
+ }
+ } else {
+ /* Use maximum duration order by default */
+ request->duration = IEEE802154_MAX_SCAN_DURATION;
+ }
+
+ err = rdev_trigger_scan(rdev, request);
+ if (err) {
+ pr_err("Failure starting scanning (%d)\n", err);
+ goto free_request;
+ }
+
+ rdev->scan_req = request;
+
+ if (wpan_dev->netdev)
+ dev_hold(wpan_dev->netdev);
+
+ return 0;
+
+free_request:
+ kfree(request);
+
+ return err;
+}
+
+static int nl802154_add_scan_req(struct sk_buff *msg,
+ struct cfg802154_scan_request *req)
+{
+ if (req->type &&
+ nla_put_u8(msg, NL802154_ATTR_SCAN_TYPE, req->type))
+ goto nla_put_failure;
+
+ if (req->flags &&
+ nla_put_u32(msg, NL802154_ATTR_SCAN_FLAGS, req->flags))
+ goto nla_put_failure;
+
+ if (req->page &&
+ nla_put_u8(msg, NL802154_ATTR_PAGE, req->page))
+ goto nla_put_failure;
+
+ if (req->channels &&
+ nla_put_u32(msg, NL802154_ATTR_SCAN_CHANNELS, req->channels))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -ENOBUFS;
+}
+
+static int nl802154_prep_scan_msg(struct sk_buff *msg,
+ struct cfg802154_registered_device *rdev,
+ struct wpan_dev *wpan_dev,
+ u32 portid, u32 seq, int flags, u8 cmd)
+{
+ void *hdr;
+
+ hdr = nl802154hdr_put(msg, portid, seq, flags, cmd);
+ if (!hdr)
+ return -ENOBUFS;
+
+ if (nla_put_u32(msg, NL802154_ATTR_WPAN_PHY, rdev->wpan_phy_idx))
+ goto nla_put_failure;
+
+ if (wpan_dev->netdev &&
+ nla_put_u32(msg, NL802154_ATTR_IFINDEX, wpan_dev->netdev->ifindex))
+ goto nla_put_failure;
+
+ if (nla_put_u64_64bit(msg, NL802154_ATTR_WPAN_DEV,
+ wpan_dev_id(wpan_dev), NL802154_ATTR_PAD))
+ goto nla_put_failure;
+
+ if (nl802154_add_scan_req(msg, rdev->scan_req))
+ goto nla_put_failure;
+
+ genlmsg_end(msg, hdr);
+
+ return 0;
+
+ nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+
+ return -EMSGSIZE;
+}
+
+static int nl802154_send_scan_done_msg(struct cfg802154_registered_device *rdev,
+ struct wpan_dev *wpan_dev)
+{
+ struct sk_buff *msg;
+ int ret;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ ret = nl802154_prep_scan_msg(msg, rdev, wpan_dev, 0, 0, 0,
+ NL802154_CMD_SCAN_DONE);
+ if (ret < 0) {
+ nlmsg_free(msg);
+ return ret;
+ }
+
+ return genlmsg_multicast_netns(&nl802154_fam,
+ wpan_phy_net(&rdev->wpan_phy), msg, 0,
+ NL802154_MCGRP_SCAN, GFP_KERNEL);
+}
+
+int nl802154_send_scan_done(struct cfg802154_registered_device *rdev,
+ struct wpan_dev *wpan_dev)
+{
+ int err;
+
+ err = nl802154_send_scan_done_msg(rdev, wpan_dev);
+
+ /* Ignore errors when there are no listeners */
+ if (err == -ESRCH)
+ err = 0;
+
+ if (wpan_dev->netdev)
+ dev_put(wpan_dev->netdev);
+
+ kfree(rdev->scan_req);
+ rdev->scan_req = NULL;
+
+ return err;
+}
+EXPORT_SYMBOL(nl802154_send_scan_done);
+
+static int nl802154_abort_scan(struct sk_buff *skb, struct genl_info *info)
+{
+ struct cfg802154_registered_device *rdev = info->user_ptr[0];
+ struct net_device *dev = info->user_ptr[1];
+ struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
+
+ /* Resources will be released in the notification helper above when we
+ * are sure all actions have ended.
+ */
+ return rdev_abort_scan(rdev, wpan_dev);
+}
+
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
static const struct nla_policy nl802154_dev_addr_policy[NL802154_DEV_ADDR_ATTR_MAX + 1] = {
[NL802154_DEV_ADDR_ATTR_PAN_ID] = { .type = NLA_U16 },
@@ -2387,6 +2605,22 @@ static const struct genl_ops nl802154_ops[] = {
.internal_flags = NL802154_FLAG_NEED_NETDEV |
NL802154_FLAG_NEED_RTNL,
},
+ {
+ .cmd = NL802154_CMD_TRIGGER_SCAN,
+ .doit = nl802154_trigger_scan,
+ .flags = GENL_ADMIN_PERM,
+ .internal_flags = NL802154_FLAG_NEED_NETDEV |
+ NL802154_FLAG_CHECK_NETDEV_UP |
+ NL802154_FLAG_NEED_RTNL,
+ },
+ {
+ .cmd = NL802154_CMD_ABORT_SCAN,
+ .doit = nl802154_abort_scan,
+ .flags = GENL_ADMIN_PERM,
+ .internal_flags = NL802154_FLAG_NEED_NETDEV |
+ NL802154_FLAG_CHECK_NETDEV_UP |
+ NL802154_FLAG_NEED_RTNL,
+ },
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
{
.cmd = NL802154_CMD_SET_SEC_PARAMS,
diff --git a/net/ieee802154/nl802154.h b/net/ieee802154/nl802154.h
index 8c4b6d08954c..84567cd4ea83 100644
--- a/net/ieee802154/nl802154.h
+++ b/net/ieee802154/nl802154.h
@@ -2,7 +2,11 @@
#ifndef __IEEE802154_NL802154_H
#define __IEEE802154_NL802154_H
+#include "core.h"
+
int nl802154_init(void);
void nl802154_exit(void);
+int nl802154_send_scan_done(struct cfg802154_registered_device *rdev,
+ struct wpan_dev *wpan_dev);
#endif /* __IEEE802154_NL802154_H */
diff --git a/net/ieee802154/rdev-ops.h b/net/ieee802154/rdev-ops.h
index 598f5af49775..e171d74c3251 100644
--- a/net/ieee802154/rdev-ops.h
+++ b/net/ieee802154/rdev-ops.h
@@ -209,6 +209,34 @@ rdev_set_ackreq_default(struct cfg802154_registered_device *rdev,
return ret;
}
+static inline int rdev_trigger_scan(struct cfg802154_registered_device *rdev,
+ struct cfg802154_scan_request *request)
+{
+ int ret;
+
+ if (!rdev->ops->trigger_scan)
+ return -EOPNOTSUPP;
+
+ trace_802154_rdev_trigger_scan(&rdev->wpan_phy, request);
+ ret = rdev->ops->trigger_scan(&rdev->wpan_phy, request);
+ trace_802154_rdev_return_int(&rdev->wpan_phy, ret);
+ return ret;
+}
+
+static inline int rdev_abort_scan(struct cfg802154_registered_device *rdev,
+ 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
diff --git a/net/ieee802154/trace.h b/net/ieee802154/trace.h
index 19c2e5d60e76..e5405f737ded 100644
--- a/net/ieee802154/trace.h
+++ b/net/ieee802154/trace.h
@@ -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),
--
2.27.0
