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cfg80211: add support to probe unexercised mesh link

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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.

Tested-by: Pradeep Kumar Chitrapu <[email protected]>
Signed-off-by: Rajkumar Manoharan <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Rajkumar Manoharan 2019-04-11 13:47:24 -07:00 • committed by Johannes Berg
commit 5ab92e7fe4
5 changed files with 101 additions and 0 deletions
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48
net/wireless/nl80211.c
View file

@ -13404,6 +13404,47 @@ static int nl80211_update_owe_info(struct sk_buff *skb, struct genl_info *info)
return rdev_update_owe_info(rdev, dev, &owe_info);
}
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;
}
if (wdev->iftype != NL80211_IFTYPE_MESH_POINT)
return -EOPNOTSUPP;
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
@ -14241,6 +14282,13 @@ static const struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
{
.cmd = NL80211_CMD_PROBE_MESH_LINK,
.doit = nl80211_probe_mesh_link,
.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 = {

13
net/wireless/rdev-ops.h
View file

@ -1286,4 +1286,17 @@ static inline int rdev_update_owe_info(struct cfg80211_registered_device *rdev,
return ret;
}
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 */

18
net/wireless/trace.h
View file

@ -3421,6 +3421,24 @@ TRACE_EVENT(cfg80211_update_owe_info_event,
WIPHY_PR_ARG, NETDEV_PR_ARG, MAC_PR_ARG(peer))
);
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