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Message-Id: <20211222155743.256280-16-miquel.raynal@bootlin.com>
Date: Wed, 22 Dec 2021 16:57:40 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
Alexander Aring <alex.aring@...il.com>,
Stefan Schmidt <stefan@...enfreihafen.org>,
linux-wpan@...r.kernel.org
Cc: David Girault <david.girault@...vo.com>,
Romuald Despres <romuald.despres@...vo.com>,
Frederic Blain <frederic.blain@...vo.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
<linux-kernel@...r.kernel.org>,
Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [net-next 15/18] net: ieee802154: Add support for beacon requests
This involves processing beacons requests: starting or stopping
the flow of beacons sent passively on a specific interface. The page and
channel must be changed beforehands if needed. Interval orders above 14
are reserved to tell a device it must answer BEACON_REQ coming from an
active scan procedure (this is not supported yet).
A beacons request structure is created to list the requirements.
Mac layers may now implement the ->send_beacons() and
->stop_beacons() hooks.
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/cfg802154.h | 22 +++++++++++
include/net/nl802154.h | 3 ++
net/ieee802154/nl802154.c | 81 +++++++++++++++++++++++++++++++++++++++
net/ieee802154/rdev-ops.h | 24 ++++++++++++
net/ieee802154/trace.h | 21 ++++++++++
5 files changed, 151 insertions(+)
diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
index 292eaf280f01..e4132bd2b636 100644
--- a/include/net/cfg802154.h
+++ b/include/net/cfg802154.h
@@ -88,6 +88,24 @@ struct cfg802154_scan_request {
struct wpan_phy *wpan_phy;
};
+/**
+ * struct cfg802154_beacons_request - beacons request descriptor
+ *
+ * @interval: interval n between sendings, in multiple order of the super frame
+ * duration: aBaseSuperframeDuration * (2^n) unless the interval
+ * order is greater or equal to 15, in this case beacons won't be
+ * passively sent out at a fixed rate but instead inform the device
+ * that it should answer beacon requests as part of active scan
+ * procedures
+ * @wpan_dev: the concerned wpan device
+ * @wpan_phy: the wpan phy this was for
+ */
+struct cfg802154_beacons_request {
+ u8 interval;
+ 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,
@@ -130,6 +148,10 @@ struct cfg802154_ops {
struct cfg802154_scan_request *request);
int (*abort_scan)(struct wpan_phy *wpan_phy,
struct wpan_dev *wpan_dev);
+ int (*send_beacons)(struct wpan_phy *wpan_phy,
+ struct cfg802154_beacons_request *request);
+ int (*stop_beacons)(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 e185e92d29d6..a20d19b6d0d4 100644
--- a/include/net/nl802154.h
+++ b/include/net/nl802154.h
@@ -63,6 +63,8 @@ enum nl802154_commands {
NL802154_CMD_SCAN_DONE,
NL802154_CMD_DUMP_PANS,
NL802154_CMD_FLUSH_PANS,
+ NL802154_CMD_SEND_BEACONS,
+ NL802154_CMD_STOP_BEACONS,
/* add new commands above here */
@@ -144,6 +146,7 @@ enum nl802154_attrs {
NL802154_ATTR_SCAN_CHANNELS,
NL802154_ATTR_SCAN_DURATION,
NL802154_ATTR_PAN,
+ NL802154_ATTR_BEACON_INTERVAL,
/* add attributes here, update the policy in nl802154.c */
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 8de8f7c31bfe..11112b515a82 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -224,6 +224,7 @@ static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
[NL802154_ATTR_SCAN_CHANNELS] = { .type = NLA_U32, },
[NL802154_ATTR_SCAN_DURATION] = { .type = NLA_U8, },
[NL802154_ATTR_PAN] = { .type = NLA_NESTED },
+ [NL802154_ATTR_BEACON_INTERVAL] = { .type = NLA_U8, },
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
[NL802154_ATTR_SEC_ENABLED] = { .type = NLA_U8, },
@@ -1630,6 +1631,70 @@ static int nl802154_flush_pans(struct sk_buff *skb, struct genl_info *info)
return 0;
}
+static int
+nl802154_send_beacons(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_beacons_request *request;
+ int err;
+
+ /* Avoid sending beacons on monitor interfaces */
+ 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;
+
+ if (info->attrs[NL802154_ATTR_BEACON_INTERVAL]) {
+ request->interval = nla_get_u8(info->attrs[NL802154_ATTR_BEACON_INTERVAL]);
+ if (request->interval > IEEE802154_MAX_SCAN_DURATION) {
+ pr_err("Answering active scan requests is not supported yet\n");
+ err = -EINVAL;
+ goto free_request;
+ }
+ } else {
+ /* Use maximum duration order by default */
+ request->interval = IEEE802154_MAX_SCAN_DURATION;
+ }
+
+ err = rdev_send_beacons(rdev, request);
+ if (err) {
+ pr_err("Failure starting sending beacons (%d)\n", err);
+ goto free_request;
+ }
+
+ if (wpan_dev->netdev)
+ dev_hold(wpan_dev->netdev);
+
+free_request:
+ kfree(request);
+
+ return err;
+}
+
+static int
+nl802154_stop_beacons(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;
+ int err;
+
+ err = rdev_stop_beacons(rdev, wpan_dev);
+
+ if (err != -ESRCH && wpan_dev->netdev)
+ dev_put(wpan_dev->netdev);
+
+ return err;
+}
+
#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 },
@@ -2746,6 +2811,22 @@ static const struct genl_ops nl802154_ops[] = {
.internal_flags = NL802154_FLAG_NEED_NETDEV |
NL802154_FLAG_NEED_RTNL,
},
+ {
+ .cmd = NL802154_CMD_SEND_BEACONS,
+ .doit = nl802154_send_beacons,
+ .flags = GENL_ADMIN_PERM,
+ .internal_flags = NL802154_FLAG_NEED_NETDEV |
+ NL802154_FLAG_CHECK_NETDEV_UP |
+ NL802154_FLAG_NEED_RTNL,
+ },
+ {
+ .cmd = NL802154_CMD_STOP_BEACONS,
+ .doit = nl802154_stop_beacons,
+ .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/rdev-ops.h b/net/ieee802154/rdev-ops.h
index e171d74c3251..fa85efeaa150 100644
--- a/net/ieee802154/rdev-ops.h
+++ b/net/ieee802154/rdev-ops.h
@@ -237,6 +237,30 @@ static inline int rdev_abort_scan(struct cfg802154_registered_device *rdev,
return ret;
}
+static inline int rdev_send_beacons(struct cfg802154_registered_device *rdev,
+ struct cfg802154_beacons_request *request)
+{
+ int ret;
+
+ /* TODO: check if this is an FFD? */
+
+ trace_802154_rdev_send_beacons(&rdev->wpan_phy, request);
+ ret = rdev->ops->send_beacons(&rdev->wpan_phy, request);
+ trace_802154_rdev_return_int(&rdev->wpan_phy, ret);
+ return ret;
+}
+
+static inline int rdev_stop_beacons(struct cfg802154_registered_device *rdev,
+ struct wpan_dev *wpan_dev)
+{
+ int ret;
+
+ trace_802154_rdev_stop_beacons(&rdev->wpan_phy, wpan_dev);
+ ret = rdev->ops->stop_beacons(&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 e5405f737ded..353ba799244f 100644
--- a/net/ieee802154/trace.h
+++ b/net/ieee802154/trace.h
@@ -315,6 +315,22 @@ TRACE_EVENT(802154_rdev_trigger_scan,
WPAN_PHY_PR_ARG, __entry->page, __entry->channels, __entry->duration)
);
+TRACE_EVENT(802154_rdev_send_beacons,
+ TP_PROTO(struct wpan_phy *wpan_phy,
+ struct cfg802154_beacons_request *request),
+ TP_ARGS(wpan_phy, request),
+ TP_STRUCT__entry(
+ WPAN_PHY_ENTRY
+ __field(u8, interval)
+ ),
+ TP_fast_assign(
+ WPAN_PHY_ASSIGN;
+ __entry->interval = request->interval;
+ ),
+ TP_printk(WPAN_PHY_PR_FMT ", sending beacons (interval order: %d)",
+ WPAN_PHY_PR_ARG, __entry->interval)
+);
+
DECLARE_EVENT_CLASS(802154_wdev_template,
TP_PROTO(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev),
TP_ARGS(wpan_phy, wpan_dev),
@@ -335,6 +351,11 @@ DEFINE_EVENT(802154_wdev_template, 802154_rdev_abort_scan,
TP_ARGS(wpan_phy, wpan_dev)
);
+DEFINE_EVENT(802154_wdev_template, 802154_rdev_stop_beacons,
+ 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
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