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nl80211: Add CMD_CONTROL_PORT_FRAME API

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This commit also adds cfg80211_rx_control_port function.  This is used
to generate a CMD_CONTROL_PORT_FRAME event out to userspace.  The
conn_owner_nlportid is used as the unicast destination.  This means that
userspace must specify NL80211_ATTR_SOCKET_OWNER flag if control port
over nl80211 routing is requested in NL80211_CMD_CONNECT,
NL80211_CMD_ASSOCIATE, NL80211_CMD_START_AP or IBSS/mesh join.

Signed-off-by: Denis Kenzior <denkenz@gmail.com>
[johannes: fix return value of cfg80211_rx_control_port()]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Denis Kenzior
2018-03-26 12:52:41 -05:00
committed by Johannes Berg
parent 4d191c7536
commit 6a671a50f8
4 changed files with 114 additions and 0 deletions
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58
net/wireless/nl80211.c
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@@ -14553,6 +14553,64 @@ void cfg80211_mgmt_tx_status(struct wireless_dev *wdev, u64 cookie,
}
EXPORT_SYMBOL(cfg80211_mgmt_tx_status);
static int __nl80211_rx_control_port(struct net_device *dev,
const u8 *buf, size_t len,
const u8 *addr, u16 proto,
bool unencrypted, gfp_t gfp)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct sk_buff *msg;
void *hdr;
u32 nlportid = READ_ONCE(wdev->conn_owner_nlportid);
if (!nlportid)
return -ENOENT;
msg = nlmsg_new(100 + len, gfp);
if (!msg)
return -ENOMEM;
hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_CONTROL_PORT_FRAME);
if (!hdr) {
nlmsg_free(msg);
return -ENOBUFS;
}
if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) ||
nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),
NL80211_ATTR_PAD) ||
nla_put(msg, NL80211_ATTR_FRAME, len, buf) ||
nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, addr) ||
nla_put_u16(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE, proto) ||
(unencrypted && nla_put_flag(msg,
NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT)))
goto nla_put_failure;
genlmsg_end(msg, hdr);
return genlmsg_unicast(wiphy_net(&rdev->wiphy), msg, nlportid);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
bool cfg80211_rx_control_port(struct net_device *dev,
const u8 *buf, size_t len,
const u8 *addr, u16 proto, bool unencrypted)
{
int ret;
trace_cfg80211_rx_control_port(dev, buf, len, addr, proto, unencrypted);
ret = __nl80211_rx_control_port(dev, buf, len, addr, proto,
unencrypted, GFP_ATOMIC);
trace_cfg80211_return_bool(ret == 0);
return ret == 0;
}
EXPORT_SYMBOL(cfg80211_rx_control_port);
static struct sk_buff *cfg80211_prepare_cqm(struct net_device *dev,
const char *mac, gfp_t gfp)
{