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cfg80211: add P2P Device abstraction

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In order to support using a different MAC address
for the P2P Device address we must first have a
P2P Device abstraction that can be assigned a MAC
address.

This abstraction will also be useful to support
offloading P2P operations to the device, e.g.
periodic listen for discoverability.

Currently, the driver is responsible for assigning
a MAC address to the P2P Device, but this could be
changed by allowing a MAC address to be given to
the NEW_INTERFACE command.

As it has no associated netdev, a P2P Device can
only be identified by its wdev identifier but the
previous patches allowed using the wdev identifier
in various APIs, e.g. remain-on-channel.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-06-16 00:19:54 +02:00
parent cc74c0c7d6
commit 98104fdeda
9 changed files with 265 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
include/linux/nl80211.h
View File

@ -565,6 +565,14 @@
* %NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ with
* %NL80211_ATTR_WIPHY_CHANNEL_TYPE.
*
* @NL80211_CMD_START_P2P_DEVICE: Start the given P2P Device, identified by
* its %NL80211_ATTR_WDEV identifier. It must have been created with
* %NL80211_CMD_NEW_INTERFACE previously. After it has been started, the
* P2P Device can be used for P2P operations, e.g. remain-on-channel and
* public action frame TX.
* @NL80211_CMD_STOP_P2P_DEVICE: Stop the given P2P Device, identified by
* its %NL80211_ATTR_WDEV identifier.
*
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@ -708,6 +716,9 @@ enum nl80211_commands {
NL80211_CMD_CH_SWITCH_NOTIFY,
NL80211_CMD_START_P2P_DEVICE,
NL80211_CMD_STOP_P2P_DEVICE,
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@ -1575,6 +1586,10 @@ enum nl80211_attrs {
* @NL80211_IFTYPE_MESH_POINT: mesh point
* @NL80211_IFTYPE_P2P_CLIENT: P2P client
* @NL80211_IFTYPE_P2P_GO: P2P group owner
* @NL80211_IFTYPE_P2P_DEVICE: P2P device interface type, this is not a netdev
* and therefore can't be created in the normal ways, use the
* %NL80211_CMD_START_P2P_DEVICE and %NL80211_CMD_STOP_P2P_DEVICE
* commands to create and destroy one
* @NL80211_IFTYPE_MAX: highest interface type number currently defined
* @NUM_NL80211_IFTYPES: number of defined interface types
*
@ -1593,6 +1608,7 @@ enum nl80211_iftype {
NL80211_IFTYPE_MESH_POINT,
NL80211_IFTYPE_P2P_CLIENT,
NL80211_IFTYPE_P2P_GO,
NL80211_IFTYPE_P2P_DEVICE,
/* keep last */
NUM_NL80211_IFTYPES,
@ -2994,12 +3010,18 @@ enum nl80211_ap_sme_features {
* @NL80211_FEATURE_CELL_BASE_REG_HINTS: This driver has been tested
* to work properly to suppport receiving regulatory hints from
* cellular base stations.
* @NL80211_FEATURE_P2P_DEVICE_NEEDS_CHANNEL: If this is set, an active
* P2P Device (%NL80211_IFTYPE_P2P_DEVICE) requires its own channel
* in the interface combinations, even when it's only used for scan
* and remain-on-channel. This could be due to, for example, the
* remain-on-channel implementation requiring a channel context.
*/
enum nl80211_feature_flags {
NL80211_FEATURE_SK_TX_STATUS = 1 << 0,
NL80211_FEATURE_HT_IBSS = 1 << 1,
NL80211_FEATURE_INACTIVITY_TIMER = 1 << 2,
NL80211_FEATURE_CELL_BASE_REG_HINTS = 1 << 3,
NL80211_FEATURE_P2P_DEVICE_NEEDS_CHANNEL = 1 << 4,
};
/**

40
include/net/cfg80211.h
View File

@ -1437,7 +1437,8 @@ struct cfg80211_gtk_rekey_data {
* @add_virtual_intf: create a new virtual interface with the given name,
* must set the struct wireless_dev's iftype. Beware: You must create
* the new netdev in the wiphy's network namespace! Returns the struct
* wireless_dev, or an ERR_PTR.
* wireless_dev, or an ERR_PTR. For P2P device wdevs, the driver must
* also set the address member in the wdev.
*
* @del_virtual_intf: remove the virtual interface
*
@ -1616,6 +1617,9 @@ struct cfg80211_gtk_rekey_data {
* @get_channel: Get the current operating channel for the virtual interface.
* For monitor interfaces, it should return %NULL unless there's a single
* current monitoring channel.
*
* @start_p2p_device: Start the given P2P device.
* @stop_p2p_device: Stop the given P2P device.
*/
struct cfg80211_ops {
int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@ -1832,6 +1836,11 @@ struct cfg80211_ops {
(*get_channel)(struct wiphy *wiphy,
struct wireless_dev *wdev,
enum nl80211_channel_type *type);
int (*start_p2p_device)(struct wiphy *wiphy,
struct wireless_dev *wdev);
void (*stop_p2p_device)(struct wiphy *wiphy,
struct wireless_dev *wdev);
};
/*
@ -2395,6 +2404,8 @@ struct cfg80211_cached_keys;
* @cleanup_work: work struct used for cleanup that can't be done directly
* @beacon_interval: beacon interval used on this device for transmitting
* beacons, 0 when not valid
* @address: The address for this device, valid only if @netdev is %NULL
* @p2p_started: true if this is a P2P Device that has been started
*/
struct wireless_dev {
struct wiphy *wiphy;
@ -2413,7 +2424,9 @@ struct wireless_dev {
struct work_struct cleanup_work;
bool use_4addr;
bool use_4addr, p2p_started;
u8 address[ETH_ALEN] __aligned(sizeof(u16));
/* currently used for IBSS and SME - might be rearranged later */
u8 ssid[IEEE80211_MAX_SSID_LEN];
@ -2461,6 +2474,13 @@ struct wireless_dev {
#endif
};
static inline u8 *wdev_address(struct wireless_dev *wdev)
{
if (wdev->netdev)
return wdev->netdev->dev_addr;
return wdev->address;
}
/**
* wdev_priv - return wiphy priv from wireless_dev
*
@ -3528,6 +3548,22 @@ void cfg80211_ch_switch_notify(struct net_device *dev, int freq,
*/
u32 cfg80211_calculate_bitrate(struct rate_info *rate);
/**
* cfg80211_unregister_wdev - remove the given wdev
* @wdev: struct wireless_dev to remove
*
* Call this function only for wdevs that have no netdev assigned,
* e.g. P2P Devices. It removes the device from the list so that
* it can no longer be used. It is necessary to call this function
* even when cfg80211 requests the removal of the interface by
* calling the del_virtual_intf() callback. The function must also
* be called when the driver wishes to unregister the wdev, e.g.
* when the device is unbound from the driver.
*
* Requires the RTNL to be held.
*/
void cfg80211_unregister_wdev(struct wireless_dev *wdev);
/* Logging, debugging and troubleshooting/diagnostic helpers. */
/* wiphy_printk helpers, similar to dev_printk */

3
net/mac80211/iface.c
View File

@ -449,6 +449,7 @@ static int ieee80211_do_open(struct net_device *dev, bool coming_up)
case NUM_NL80211_IFTYPES:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_P2P_DEVICE:
/* cannot happen */
WARN_ON(1);
break;
@ -1146,6 +1147,8 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_AP_VLAN:
break;
case NL80211_IFTYPE_P2P_DEVICE:
/* not yet supported */
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
BUG();

2
net/mac80211/util.c
View File

@ -1390,6 +1390,8 @@ int ieee80211_reconfig(struct ieee80211_local *local)
case NL80211_IFTYPE_MONITOR:
/* ignore virtual */
break;
case NL80211_IFTYPE_P2P_DEVICE:
/* not yet supported */
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
case NL80211_IFTYPE_P2P_CLIENT:

7
net/wireless/chan.c
View File

@ -105,7 +105,7 @@ cfg80211_get_chan_state(struct wireless_dev *wdev,
ASSERT_WDEV_LOCK(wdev);
if (!netif_running(wdev->netdev))
if (wdev->netdev && !netif_running(wdev->netdev))
return;
switch (wdev->iftype) {
@ -143,6 +143,11 @@ cfg80211_get_chan_state(struct wireless_dev *wdev,
case NL80211_IFTYPE_WDS:
/* these interface types don't really have a channel */
return;
case NL80211_IFTYPE_P2P_DEVICE:
if (wdev->wiphy->features &
NL80211_FEATURE_P2P_DEVICE_NEEDS_CHANNEL)
*chanmode = CHAN_MODE_EXCLUSIVE;
return;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
WARN_ON(1);

53
net/wireless/core.c
View File

@ -230,9 +230,24 @@ static int cfg80211_rfkill_set_block(void *data, bool blocked)
rtnl_lock();
mutex_lock(&rdev->devlist_mtx);
list_for_each_entry(wdev, &rdev->wdev_list, list)
if (wdev->netdev)
list_for_each_entry(wdev, &rdev->wdev_list, list) {
if (wdev->netdev) {
dev_close(wdev->netdev);
continue;
}
/* otherwise, check iftype */
switch (wdev->iftype) {
case NL80211_IFTYPE_P2P_DEVICE:
if (!wdev->p2p_started)
break;
rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
wdev->p2p_started = false;
rdev->opencount--;
break;
default:
break;
}
}
mutex_unlock(&rdev->devlist_mtx);
rtnl_unlock();
@ -407,6 +422,11 @@ static int wiphy_verify_combinations(struct wiphy *wiphy)
if (WARN_ON(wiphy->software_iftypes & types))
return -EINVAL;
/* Only a single P2P_DEVICE can be allowed */
if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
c->limits[j].max > 1))
return -EINVAL;
cnt += c->limits[j].max;
/*
* Don't advertise an unsupported type
@ -734,6 +754,35 @@ static void wdev_cleanup_work(struct work_struct *work)
dev_put(wdev->netdev);
}
void cfg80211_unregister_wdev(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
ASSERT_RTNL();
if (WARN_ON(wdev->netdev))
return;
mutex_lock(&rdev->devlist_mtx);
list_del_rcu(&wdev->list);
rdev->devlist_generation++;
switch (wdev->iftype) {
case NL80211_IFTYPE_P2P_DEVICE:
if (!wdev->p2p_started)
break;
rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
wdev->p2p_started = false;
rdev->opencount--;
break;
default:
WARN_ON_ONCE(1);
break;
}
mutex_unlock(&rdev->devlist_mtx);
}
EXPORT_SYMBOL(cfg80211_unregister_wdev);
static struct device_type wiphy_type = {
.name = "wlan",
};

10
net/wireless/mlme.c
View File

@ -736,7 +736,6 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
const u8 *buf, size_t len, bool no_cck,
bool dont_wait_for_ack, u64 *cookie)
{
struct net_device *dev = wdev->netdev;
const struct ieee80211_mgmt *mgmt;
u16 stype;
@ -796,7 +795,7 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_AP_VLAN:
if (!ether_addr_equal(mgmt->bssid, dev->dev_addr))
if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
err = -EINVAL;
break;
case NL80211_IFTYPE_MESH_POINT:
@ -809,6 +808,11 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
* cfg80211 doesn't track the stations
*/
break;
case NL80211_IFTYPE_P2P_DEVICE:
/*
* fall through, P2P device only supports
* public action frames
*/
default:
err = -EOPNOTSUPP;
break;
@ -819,7 +823,7 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
return err;
}
if (!ether_addr_equal(mgmt->sa, dev->dev_addr))
if (!ether_addr_equal(mgmt->sa, wdev_address(wdev)))
return -EINVAL;
/* Transmit the Action frame as requested by user space */

122
net/wireless/nl80211.c
View File

@ -1100,6 +1100,7 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
if (nla_put_u32(msg, i, NL80211_CMD_REGISTER_BEACONS))
goto nla_put_failure;
}
CMD(start_p2p_device, START_P2P_DEVICE);
#ifdef CONFIG_NL80211_TESTMODE
CMD(testmode_cmd, TESTMODE);
@ -1748,13 +1749,13 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 pid, u32 seq, int flags,
if (dev &&
(nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) ||
nla_put_string(msg, NL80211_ATTR_IFNAME, dev->name) ||
nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, dev->dev_addr)))
nla_put_string(msg, NL80211_ATTR_IFNAME, dev->name)))
goto nla_put_failure;
if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
nla_put_u32(msg, NL80211_ATTR_IFTYPE, wdev->iftype) ||
nla_put_u64(msg, NL80211_ATTR_WDEV, wdev_id(wdev)) ||
nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, wdev_address(wdev)) ||
nla_put_u32(msg, NL80211_ATTR_GENERATION,
rdev->devlist_generation ^
(cfg80211_rdev_list_generation << 2)))
@ -2021,8 +2022,10 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
return PTR_ERR(wdev);
}
if (type == NL80211_IFTYPE_MESH_POINT &&
info->attrs[NL80211_ATTR_MESH_ID]) {
switch (type) {
case NL80211_IFTYPE_MESH_POINT:
if (!info->attrs[NL80211_ATTR_MESH_ID])
break;
wdev_lock(wdev);
BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN !=
IEEE80211_MAX_MESH_ID_LEN);
@ -2031,6 +2034,26 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
memcpy(wdev->ssid, nla_data(info->attrs[NL80211_ATTR_MESH_ID]),
wdev->mesh_id_up_len);
wdev_unlock(wdev);
break;
case NL80211_IFTYPE_P2P_DEVICE:
/*
* P2P Device doesn't have a netdev, so doesn't go
* through the netdev notifier and must be added here
*/
mutex_init(&wdev->mtx);
INIT_LIST_HEAD(&wdev->event_list);
spin_lock_init(&wdev->event_lock);
INIT_LIST_HEAD(&wdev->mgmt_registrations);
spin_lock_init(&wdev->mgmt_registrations_lock);
mutex_lock(&rdev->devlist_mtx);
wdev->identifier = ++rdev->wdev_id;
list_add_rcu(&wdev->list, &rdev->wdev_list);
rdev->devlist_generation++;
mutex_unlock(&rdev->devlist_mtx);
break;
default:
break;
}
if (nl80211_send_iface(msg, info->snd_pid, info->snd_seq, 0,
@ -6053,6 +6076,7 @@ static int nl80211_register_mgmt(struct sk_buff *skb, struct genl_info *info)
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_P2P_DEVICE:
break;
default:
return -EOPNOTSUPP;
@ -6099,6 +6123,7 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_P2P_DEVICE:
break;
default:
return -EOPNOTSUPP;
@ -6195,6 +6220,7 @@ static int nl80211_tx_mgmt_cancel_wait(struct sk_buff *skb, struct genl_info *in
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_P2P_DEVICE:
break;
default:
return -EOPNOTSUPP;
@ -6810,6 +6836,68 @@ static int nl80211_register_beacons(struct sk_buff *skb, struct genl_info *info)
return 0;
}
static int nl80211_start_p2p_device(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct wireless_dev *wdev = info->user_ptr[1];
int err;
if (!rdev->ops->start_p2p_device)
return -EOPNOTSUPP;
if (wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)
return -EOPNOTSUPP;
if (wdev->p2p_started)
return 0;
mutex_lock(&rdev->devlist_mtx);
err = cfg80211_can_add_interface(rdev, wdev->iftype);
mutex_unlock(&rdev->devlist_mtx);
if (err)
return err;
err = rdev->ops->start_p2p_device(&rdev->wiphy, wdev);
if (err)
return err;
wdev->p2p_started = true;
mutex_lock(&rdev->devlist_mtx);
rdev->opencount++;
mutex_unlock(&rdev->devlist_mtx);
return 0;
}
static int nl80211_stop_p2p_device(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct wireless_dev *wdev = info->user_ptr[1];
if (wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)
return -EOPNOTSUPP;
if (!rdev->ops->stop_p2p_device)
return -EOPNOTSUPP;
if (!wdev->p2p_started)
return 0;
rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
wdev->p2p_started = false;
mutex_lock(&rdev->devlist_mtx);
rdev->opencount--;
mutex_unlock(&rdev->devlist_mtx);
if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
rdev->scan_req->aborted = true;
___cfg80211_scan_done(rdev, true);
}
return 0;
}
#define NL80211_FLAG_NEED_WIPHY 0x01
#define NL80211_FLAG_NEED_NETDEV 0x02
#define NL80211_FLAG_NEED_RTNL 0x04
@ -6817,7 +6905,7 @@ static int nl80211_register_beacons(struct sk_buff *skb, struct genl_info *info)
#define NL80211_FLAG_NEED_NETDEV_UP (NL80211_FLAG_NEED_NETDEV |\
NL80211_FLAG_CHECK_NETDEV_UP)
#define NL80211_FLAG_NEED_WDEV 0x10
/* If a netdev is associated, it must be UP */
/* If a netdev is associated, it must be UP, P2P must be started */
#define NL80211_FLAG_NEED_WDEV_UP (NL80211_FLAG_NEED_WDEV |\
NL80211_FLAG_CHECK_NETDEV_UP)
@ -6878,6 +6966,13 @@ static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
}
dev_hold(dev);
} else if (ops->internal_flags & NL80211_FLAG_CHECK_NETDEV_UP) {
if (!wdev->p2p_started) {
mutex_unlock(&cfg80211_mutex);
if (rtnl)
rtnl_unlock();
return -ENETDOWN;
}
}
cfg80211_lock_rdev(rdev);
@ -7439,7 +7534,22 @@ static struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV |
NL80211_FLAG_NEED_RTNL,
},
{
.cmd = NL80211_CMD_START_P2P_DEVICE,
.doit = nl80211_start_p2p_device,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
.internal_flags = NL80211_FLAG_NEED_WDEV |
NL80211_FLAG_NEED_RTNL,
},
{
.cmd = NL80211_CMD_STOP_P2P_DEVICE,
.doit = nl80211_stop_p2p_device,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
.internal_flags = NL80211_FLAG_NEED_WDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
};
static struct genl_multicast_group nl80211_mlme_mcgrp = {

14
net/wireless/util.c
View File

@ -800,6 +800,10 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
if (otype == NL80211_IFTYPE_AP_VLAN)
return -EOPNOTSUPP;
/* cannot change into P2P device type */
if (ntype == NL80211_IFTYPE_P2P_DEVICE)
return -EOPNOTSUPP;
if (!rdev->ops->change_virtual_intf ||
!(rdev->wiphy.interface_modes & (1 << ntype)))
return -EOPNOTSUPP;
@ -877,6 +881,9 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
case NUM_NL80211_IFTYPES:
/* not happening */
break;
case NL80211_IFTYPE_P2P_DEVICE:
WARN_ON(1);
break;
}
}
@ -1041,8 +1048,15 @@ int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
if (wdev_iter == wdev)
continue;
if (wdev_iter->netdev) {
if (!netif_running(wdev_iter->netdev))
continue;
} else if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
if (!wdev_iter->p2p_started)
continue;
} else {
WARN_ON(1);
}
if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
continue;