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cfg80211: add wowlan net-detect support
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Add a new WoWLAN API to enable net-detect as a wake up trigger.
Net-detect allows the device to scan in the background while the
host is asleep to wake up the host system when a matching network
is found.

Reuse the scheduled scan attributes to specify how the scan is
performed while suspended and the matches that will trigger a
wake event.

Signed-off-by: Luciano Coelho <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
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@lucacoelho @jmberg-intel
lucacoelho authored and jmberg-intel committed Nov 19, 2014
1 parent 256da02 commit 8cd4d45
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Showing 4 changed files with 175 additions and 1 deletion.
41 changes: 41 additions & 0 deletions include/net/cfg80211.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1940,6 +1940,7 @@ struct cfg80211_wowlan_tcp {
* @rfkill_release: wake up when rfkill is released
* @tcp: TCP connection establishment/wakeup parameters, see nl80211.h.
* NULL if not configured.
* @nd_config: configuration for the scan to be used for net detect wake.
*/
struct cfg80211_wowlan {
bool any, disconnect, magic_pkt, gtk_rekey_failure,
Expand All @@ -1948,6 +1949,7 @@ struct cfg80211_wowlan {
struct cfg80211_pkt_pattern *patterns;
struct cfg80211_wowlan_tcp *tcp;
int n_patterns;
struct cfg80211_sched_scan_request *nd_config;
};

/**
Expand Down Expand Up @@ -1979,6 +1981,35 @@ struct cfg80211_coalesce {
int n_rules;
};

/**
* struct cfg80211_wowlan_nd_match - information about the match
*
* @ssid: SSID of the match that triggered the wake up
* @n_channels: Number of channels where the match occurred. This
* value may be zero if the driver can't report the channels.
* @channels: center frequencies of the channels where a match
* occurred (in MHz)
*/
struct cfg80211_wowlan_nd_match {
struct cfg80211_ssid ssid;
int n_channels;
u32 channels[];
};

/**
* struct cfg80211_wowlan_nd_info - net detect wake up information
*
* @n_matches: Number of match information instances provided in
* @matches. This value may be zero if the driver can't provide
* match information.
* @matches: Array of pointers to matches containing information about
* the matches that triggered the wake up.
*/
struct cfg80211_wowlan_nd_info {
int n_matches;
struct cfg80211_wowlan_nd_match *matches[];
};

/**
* struct cfg80211_wowlan_wakeup - wakeup report
* @disconnect: woke up by getting disconnected
Expand All @@ -1998,6 +2029,7 @@ struct cfg80211_coalesce {
* @tcp_match: TCP wakeup packet received
* @tcp_connlost: TCP connection lost or failed to establish
* @tcp_nomoretokens: TCP data ran out of tokens
* @net_detect: if not %NULL, woke up because of net detect
*/
struct cfg80211_wowlan_wakeup {
bool disconnect, magic_pkt, gtk_rekey_failure,
Expand All @@ -2007,6 +2039,7 @@ struct cfg80211_wowlan_wakeup {
s32 pattern_idx;
u32 packet_present_len, packet_len;
const void *packet;
struct cfg80211_wowlan_nd_info *net_detect;
};

/**
Expand Down Expand Up @@ -2810,6 +2843,7 @@ struct ieee80211_txrx_stypes {
* @WIPHY_WOWLAN_EAP_IDENTITY_REQ: supports wakeup on EAP identity request
* @WIPHY_WOWLAN_4WAY_HANDSHAKE: supports wakeup on 4-way handshake failure
* @WIPHY_WOWLAN_RFKILL_RELEASE: supports wakeup on RF-kill release
* @WIPHY_WOWLAN_NET_DETECT: supports wakeup on network detection
*/
enum wiphy_wowlan_support_flags {
WIPHY_WOWLAN_ANY = BIT(0),
Expand All @@ -2820,6 +2854,7 @@ enum wiphy_wowlan_support_flags {
WIPHY_WOWLAN_EAP_IDENTITY_REQ = BIT(5),
WIPHY_WOWLAN_4WAY_HANDSHAKE = BIT(6),
WIPHY_WOWLAN_RFKILL_RELEASE = BIT(7),
WIPHY_WOWLAN_NET_DETECT = BIT(8),
};

struct wiphy_wowlan_tcp_support {
Expand All @@ -2838,6 +2873,11 @@ struct wiphy_wowlan_tcp_support {
* @pattern_max_len: maximum length of each pattern
* @pattern_min_len: minimum length of each pattern
* @max_pkt_offset: maximum Rx packet offset
* @max_nd_match_sets: maximum number of matchsets for net-detect,
* similar, but not necessarily identical, to max_match_sets for
* scheduled scans.
* See &struct cfg80211_sched_scan_request.@match_sets for more
* details.
* @tcp: TCP wakeup support information
*/
struct wiphy_wowlan_support {
Expand All @@ -2846,6 +2886,7 @@ struct wiphy_wowlan_support {
int pattern_max_len;
int pattern_min_len;
int max_pkt_offset;
int max_nd_match_sets;
const struct wiphy_wowlan_tcp_support *tcp;
};

Expand Down
23 changes: 23 additions & 0 deletions include/uapi/linux/nl80211.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1686,6 +1686,7 @@ enum nl80211_commands {
*
* @NL80211_ATTR_OPER_CLASS: operating class
*
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
Expand Down Expand Up @@ -2043,6 +2044,7 @@ enum nl80211_attrs {
/* add attributes here, update the policy in nl80211.c */

__NL80211_ATTR_AFTER_LAST,
NUM_NL80211_ATTR = __NL80211_ATTR_AFTER_LAST,
NL80211_ATTR_MAX = __NL80211_ATTR_AFTER_LAST - 1
};

Expand Down Expand Up @@ -3610,6 +3612,25 @@ struct nl80211_pattern_support {
* @NL80211_WOWLAN_TRIG_WAKEUP_TCP_NOMORETOKENS: For wakeup reporting only,
* the TCP connection ran out of tokens to use for data to send to the
* service
* @NL80211_WOWLAN_TRIG_NET_DETECT: wake up when a configured network
* is detected. This is a nested attribute that contains the
* same attributes used with @NL80211_CMD_START_SCHED_SCAN. It
* specifies how the scan is performed (e.g. the interval and the
* channels to scan) as well as the scan results that will
* trigger a wake (i.e. the matchsets).
* @NL80211_WOWLAN_TRIG_NET_DETECT_RESULTS: nested attribute
* containing an array with information about what triggered the
* wake up. If no elements are present in the array, it means
* that the information is not available. If more than one
* element is present, it means that more than one match
* occurred.
* Each element in the array is a nested attribute that contains
* one optional %NL80211_ATTR_SSID attribute and one optional
* %NL80211_ATTR_SCAN_FREQUENCIES attribute. At least one of
* these attributes must be present. If
* %NL80211_ATTR_SCAN_FREQUENCIES contains more than one
* frequency, it means that the match occurred in more than one
* channel.
* @NUM_NL80211_WOWLAN_TRIG: number of wake on wireless triggers
* @MAX_NL80211_WOWLAN_TRIG: highest wowlan trigger attribute number
*
Expand All @@ -3635,6 +3656,8 @@ enum nl80211_wowlan_triggers {
NL80211_WOWLAN_TRIG_WAKEUP_TCP_MATCH,
NL80211_WOWLAN_TRIG_WAKEUP_TCP_CONNLOST,
NL80211_WOWLAN_TRIG_WAKEUP_TCP_NOMORETOKENS,
NL80211_WOWLAN_TRIG_NET_DETECT,
NL80211_WOWLAN_TRIG_NET_DETECT_RESULTS,

/* keep last */
NUM_NL80211_WOWLAN_TRIG,
Expand Down
1 change: 1 addition & 0 deletions net/wireless/core.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,7 @@ cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
rdev->wiphy.wowlan_config->tcp->sock)
sock_release(rdev->wiphy.wowlan_config->tcp->sock);
kfree(rdev->wiphy.wowlan_config->tcp);
kfree(rdev->wiphy.wowlan_config->nd_config);
kfree(rdev->wiphy.wowlan_config);
#endif
}
Expand Down
111 changes: 110 additions & 1 deletion net/wireless/nl80211.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -209,7 +209,7 @@ cfg80211_get_dev_from_info(struct net *netns, struct genl_info *info)
}

/* policy for the attributes */
static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
.len = 20-1 },
Expand Down Expand Up @@ -428,6 +428,7 @@ nl80211_wowlan_policy[NUM_NL80211_WOWLAN_TRIG] = {
[NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE] = { .type = NLA_FLAG },
[NL80211_WOWLAN_TRIG_RFKILL_RELEASE] = { .type = NLA_FLAG },
[NL80211_WOWLAN_TRIG_TCP_CONNECTION] = { .type = NLA_NESTED },
[NL80211_WOWLAN_TRIG_NET_DETECT] = { .type = NLA_NESTED },
};

static const struct nla_policy
Expand Down Expand Up @@ -1088,6 +1089,8 @@ static int nl80211_send_wowlan(struct sk_buff *msg,
if (large && nl80211_send_wowlan_tcp_caps(rdev, msg))
return -ENOBUFS;

/* TODO: send wowlan net detect */

nla_nest_end(msg, nl_wowlan);

return 0;
Expand Down Expand Up @@ -8695,6 +8698,39 @@ static int nl80211_parse_wowlan_tcp(struct cfg80211_registered_device *rdev,
return 0;
}

static int nl80211_parse_wowlan_nd(struct cfg80211_registered_device *rdev,
const struct wiphy_wowlan_support *wowlan,
struct nlattr *attr,
struct cfg80211_wowlan *trig)
{
struct nlattr **tb;
int err;

tb = kzalloc(NUM_NL80211_ATTR * sizeof(*tb), GFP_KERNEL);
if (!tb)
return -ENOMEM;

if (!(wowlan->flags & WIPHY_WOWLAN_NET_DETECT)) {
err = -EOPNOTSUPP;
goto out;
}

err = nla_parse(tb, NL80211_ATTR_MAX,
nla_data(attr), nla_len(attr),
nl80211_policy);
if (err)
goto out;

trig->nd_config = nl80211_parse_sched_scan(&rdev->wiphy, tb);
err = PTR_ERR_OR_ZERO(trig->nd_config);
if (err)
trig->nd_config = NULL;

out:
kfree(tb);
return err;
}

static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
Expand Down Expand Up @@ -8840,6 +8876,14 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
goto error;
}

if (tb[NL80211_WOWLAN_TRIG_NET_DETECT]) {
err = nl80211_parse_wowlan_nd(
rdev, wowlan, tb[NL80211_WOWLAN_TRIG_NET_DETECT],
&new_triggers);
if (err)
goto error;
}

ntrig = kmemdup(&new_triggers, sizeof(new_triggers), GFP_KERNEL);
if (!ntrig) {
err = -ENOMEM;
Expand Down Expand Up @@ -12082,6 +12126,67 @@ void cfg80211_report_obss_beacon(struct wiphy *wiphy,
EXPORT_SYMBOL(cfg80211_report_obss_beacon);

#ifdef CONFIG_PM
static int cfg80211_net_detect_results(struct sk_buff *msg,
struct cfg80211_wowlan_wakeup *wakeup)
{
struct cfg80211_wowlan_nd_info *nd = wakeup->net_detect;
struct nlattr *nl_results, *nl_match, *nl_freqs;
int i, j;

nl_results = nla_nest_start(
msg, NL80211_WOWLAN_TRIG_NET_DETECT_RESULTS);
if (!nl_results)
return -EMSGSIZE;

for (i = 0; i < nd->n_matches; i++) {
struct cfg80211_wowlan_nd_match *match = nd->matches[i];

nl_match = nla_nest_start(msg, i);
if (!nl_match)
break;

/* The SSID attribute is optional in nl80211, but for
* simplicity reasons it's always present in the
* cfg80211 structure. If a driver can't pass the
* SSID, that needs to be changed. A zero length SSID
* is still a valid SSID (wildcard), so it cannot be
* used for this purpose.
*/
if (nla_put(msg, NL80211_ATTR_SSID, match->ssid.ssid_len,
match->ssid.ssid)) {
nla_nest_cancel(msg, nl_match);
goto out;
}

if (match->n_channels) {
nl_freqs = nla_nest_start(
msg, NL80211_ATTR_SCAN_FREQUENCIES);
if (!nl_freqs) {
nla_nest_cancel(msg, nl_match);
goto out;
}

for (j = 0; j < match->n_channels; j++) {
if (nla_put_u32(msg,
NL80211_ATTR_WIPHY_FREQ,
match->channels[j])) {
nla_nest_cancel(msg, nl_freqs);
nla_nest_cancel(msg, nl_match);
goto out;
}
}

nla_nest_end(msg, nl_freqs);
}

nla_nest_end(msg, nl_match);
}

out:
nla_nest_end(msg, nl_results);
return 0;
}

void cfg80211_report_wowlan_wakeup(struct wireless_dev *wdev,
struct cfg80211_wowlan_wakeup *wakeup,
gfp_t gfp)
Expand Down Expand Up @@ -12176,6 +12281,10 @@ void cfg80211_report_wowlan_wakeup(struct wireless_dev *wdev,
goto free_msg;
}

if (wakeup->net_detect &&
cfg80211_net_detect_results(msg, wakeup))
goto free_msg;

nla_nest_end(msg, reasons);
}

Expand Down

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