Adding support to allow mesh HWMP to measure link metrics on unexercised
direct mesh path by sending some data frames to other mesh points which
are not currently selected as a primary traffic path but only 1 hop away.
The absence of the primary path to the chosen node makes it necessary to
apply some form of marking on a chosen packet stream so that the packets
can be properly steered to the selected node for testing, and not by the
regular mesh path lookup.
Signed-off-by: Rajkumar Manoharan <rmanohar@xxxxxxxxxxxxxx>
---
include/net/cfg80211.h | 6 +++++
include/uapi/linux/nl80211.h | 16 +++++++++++++
net/wireless/nl80211.c | 54 ++++++++++++++++++++++++++++++++++++++++++++
net/wireless/rdev-ops.h | 13 +++++++++++
net/wireless/trace.h | 19 ++++++++++++++++
5 files changed, 108 insertions(+)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 13bfeb712d36..ae8a57b79a6e 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3436,6 +3436,9 @@ struct cfg80211_pmsr_request {
* Statistics should be cumulative, currently no way to reset is provided.
* @start_pmsr: start peer measurement (e.g. FTM)
* @abort_pmsr: abort peer measurement
+ *
+ * @probe_mesh_link: Probe direct Mesh peer's link quality by sending data frame
+ * and overrule HWMP path selection algorithm.
*/
struct cfg80211_ops {
int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -3750,6 +3753,9 @@ struct cfg80211_ops {
struct cfg80211_pmsr_request *request);
void (*abort_pmsr)(struct wiphy *wiphy, struct wireless_dev *wdev,
struct cfg80211_pmsr_request *request);
+
+ int (*probe_mesh_link)(struct wiphy *wiphy, struct net_device *dev,
+ const u8 *buf, size_t len);
};
/*
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index dd4f86ee286e..d4ec38f5934e 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1065,6 +1065,21 @@
* indicated by %NL80211_ATTR_WIPHY_FREQ and other attributes
* determining the width and type.
*
+ * @NL80211_CMD_PROBE_MESH_LINK: The requirement for mesh link metric
+ * refreshing, is that from one mesh point we be able to send some data
+ * frames to other mesh points which are not currently selected as a
+ * primary traffic path, but which are only 1 hop away. The absence of
+ * the primary path to the chosen node makes it necessary to apply some
+ * form of marking on a chosen packet stream so that the packets can be
+ * properly steered to the selected node for testing, and not by the
+ * regular mesh path lookup. Further, the packets must be of type data
+ * so that the rate control (often embedded in firmware) is used for
+ * rate selection.
+ *
+ * Here attribute %NL80211_ATTR_MAC is used to specify connected mesh
+ * peer MAC address and %NL80211_ATTR_FRAME is used to specify the frame
+ * content. The frame is ethernet data.
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -1284,6 +1299,7 @@ enum nl80211_commands {
NL80211_CMD_PEER_MEASUREMENT_COMPLETE,
NL80211_CMD_NOTIFY_RADAR,
+ NL80211_CMD_PROBE_MESH_LINK,
/* add new commands above here */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 47e30a58566c..ba97ceddd877 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -13259,6 +13259,52 @@ static int nl80211_get_ftm_responder_stats(struct sk_buff *skb,
return -ENOBUFS;
}
+static int nl80211_probe_mesh_link(struct sk_buff *skb, struct genl_info *info)
+{
+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
+ struct net_device *dev = info->user_ptr[1];
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
+ struct station_info sinfo = {};
+ const u8 *buf;
+ size_t len;
+ u8 *dest;
+ int err;
+
+ if (!rdev->ops->probe_mesh_link || !rdev->ops->get_station)
+ return -EOPNOTSUPP;
+
+ if (!info->attrs[NL80211_ATTR_MAC] ||
+ !info->attrs[NL80211_ATTR_FRAME]) {
+ GENL_SET_ERR_MSG(info, "Frame or MAC missing");
+ return -EINVAL;
+ }
+
+ wdev_lock(wdev);
+ if (wdev->iftype != NL80211_IFTYPE_MESH_POINT) {
+ wdev_unlock(wdev);
+ err = -EOPNOTSUPP;
+ return err;
+ }
+ wdev_unlock(wdev);
+
+ dest = nla_data(info->attrs[NL80211_ATTR_MAC]);
+ buf = nla_data(info->attrs[NL80211_ATTR_FRAME]);
+ len = nla_len(info->attrs[NL80211_ATTR_FRAME]);
+
+ if (len < sizeof(struct ethhdr))
+ return -EINVAL;
+
+ if (!ether_addr_equal(buf, dest) || is_multicast_ether_addr(buf) ||
+ !ether_addr_equal(buf + ETH_ALEN, dev->dev_addr))
+ return -EINVAL;
+
+ err = rdev_get_station(rdev, dev, dest, &sinfo);
+ if (err)
+ return err;
+
+ return rdev_probe_mesh_link(rdev, dev, dest, buf, len);
+}
+
#define NL80211_FLAG_NEED_WIPHY 0x01
#define NL80211_FLAG_NEED_NETDEV 0x02
#define NL80211_FLAG_NEED_RTNL 0x04
@@ -14199,6 +14245,14 @@ static void nl80211_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
+ {
+ .cmd = NL80211_CMD_PROBE_MESH_LINK,
+ .doit = nl80211_probe_mesh_link,
+ .policy = nl80211_policy,
+ .flags = GENL_UNS_ADMIN_PERM,
+ .internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
+ NL80211_FLAG_NEED_RTNL,
+ },
};
static struct genl_family nl80211_fam __ro_after_init = {
diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index 5cb48d135fab..ec1b4800872f 100644
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -1272,4 +1272,17 @@ static inline int rdev_del_pmk(struct cfg80211_registered_device *rdev,
trace_rdev_return_void(&rdev->wiphy);
}
+static inline int
+rdev_probe_mesh_link(struct cfg80211_registered_device *rdev,
+ struct net_device *dev, const u8 *dest,
+ const void *buf, size_t len)
+{
+ int ret;
+
+ trace_rdev_probe_mesh_link(&rdev->wiphy, dev, dest, buf, len);
+ ret = rdev->ops->probe_mesh_link(&rdev->wiphy, dev, buf, len);
+ trace_rdev_return_int(&rdev->wiphy, ret);
+ return ret;
+}
+
#endif /* __CFG80211_RDEV_OPS */
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 44b2ce1bb13a..274a844c7ea9 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -3362,6 +3362,25 @@
WIPHY_PR_ARG, WDEV_PR_ARG,
(unsigned long long)__entry->cookie)
);
+
+TRACE_EVENT(rdev_probe_mesh_link,
+ TP_PROTO(struct wiphy *wiphy, struct net_device *netdev,
+ const u8 *dest, const u8 *buf, size_t len),
+ TP_ARGS(wiphy, netdev, dest, buf, len),
+ TP_STRUCT__entry(
+ WIPHY_ENTRY
+ NETDEV_ENTRY
+ MAC_ENTRY(dest)
+ ),
+ TP_fast_assign(
+ WIPHY_ASSIGN;
+ NETDEV_ASSIGN;
+ MAC_ASSIGN(dest, dest);
+ ),
+ TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", " MAC_PR_FMT,
+ WIPHY_PR_ARG, NETDEV_PR_ARG, MAC_PR_ARG(dest))
+);
+
#endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
#undef TRACE_INCLUDE_PATH
--
1.9.1
