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nl80211/cfg80211: Allow SSID to be specified in new beacon command

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This makes it easier for drivers that generate Beacon and Probe Response
frames internally (in firmware most likely) in AP mode.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2011-08-10 23:53:31 +03:00 committed by John W. Linville
parent 0879fa44b5
commit 32e9de846b
3 changed files with 60 additions and 0 deletions
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24
include/linux/nl80211.h
View File

@ -161,6 +161,9 @@
* @NL80211_CMD_SET_BEACON: set the beacon on an access point interface
* using the %NL80211_ATTR_BEACON_INTERVAL, %NL80211_ATTR_DTIM_PERIOD,
* %NL80211_ATTR_BEACON_HEAD and %NL80211_ATTR_BEACON_TAIL attributes.
* Following attributes are provided for drivers that generate full Beacon
* and Probe Response frames internally: %NL80211_ATTR_SSID,
* %NL80211_ATTR_HIDDEN_SSID.
* @NL80211_CMD_NEW_BEACON: add a new beacon to an access point interface,
* parameters are like for %NL80211_CMD_SET_BEACON.
* @NL80211_CMD_DEL_BEACON: remove the beacon, stop sending it
@ -1019,6 +1022,10 @@ enum nl80211_commands {
* being a list of supported rates as defined by IEEE 802.11 7.3.2.2 but
* without the length restriction (at most %NL80211_MAX_SUPP_RATES).
*
* @NL80211_ATTR_HIDDEN_SSID: indicates whether SSID is to be hidden from Beacon
* and Probe Response (when response to wildcard Probe Request); see
* &enum nl80211_hidden_ssid, represented as a u32
*
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@ -1224,6 +1231,8 @@ enum nl80211_attrs {
NL80211_ATTR_SCAN_SUPP_RATES,
NL80211_ATTR_HIDDEN_SSID,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@ -2430,4 +2439,19 @@ enum nl80211_rekey_data {
MAX_NL80211_REKEY_DATA = NUM_NL80211_REKEY_DATA - 1
};
/**
* enum nl80211_hidden_ssid - values for %NL80211_ATTR_HIDDEN_SSID
* @NL80211_HIDDEN_SSID_NOT_IN_USE: do not hide SSID (i.e., broadcast it in
* Beacon frames)
* @NL80211_HIDDEN_SSID_ZERO_LEN: hide SSID by using zero-length SSID element
* in Beacon frames
* @NL80211_HIDDEN_SSID_ZERO_CONTENTS: hide SSID by using correct length of SSID
* element in Beacon frames but zero out each byte in the SSID
*/
enum nl80211_hidden_ssid {
NL80211_HIDDEN_SSID_NOT_IN_USE,
NL80211_HIDDEN_SSID_ZERO_LEN,
NL80211_HIDDEN_SSID_ZERO_CONTENTS
};
#endif /* __LINUX_NL80211_H */

7
include/net/cfg80211.h
View File

@ -346,11 +346,18 @@ struct survey_info {
* @dtim_period: DTIM period or zero if not changed
* @head_len: length of @head
* @tail_len: length of @tail
* @ssid: SSID to be used in the BSS (note: may be %NULL if not provided from
* user space)
* @ssid_len: length of @ssid
* @hidden_ssid: whether to hide the SSID in Beacon/Probe Response frames
*/
struct beacon_parameters {
u8 *head, *tail;
int interval, dtim_period;
int head_len, tail_len;
const u8 *ssid;
size_t ssid_len;
enum nl80211_hidden_ssid hidden_ssid;
};
/**

29
net/wireless/nl80211.c
View File

@ -178,6 +178,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_SCHED_SCAN_INTERVAL] = { .type = NLA_U32 },
[NL80211_ATTR_REKEY_DATA] = { .type = NLA_NESTED },
[NL80211_ATTR_SCAN_SUPP_RATES] = { .type = NLA_NESTED },
[NL80211_ATTR_HIDDEN_SSID] = { .type = NLA_U32 },
};
/* policy for the key attributes */
@ -2010,6 +2011,34 @@ static int nl80211_addset_beacon(struct sk_buff *skb, struct genl_info *info)
if (err)
return err;
/*
* In theory, some of these attributes could be required for
* NEW_BEACON, but since they were not used when the command was
* originally added, keep them optional for old user space
* programs to work with drivers that do not need the additional
* information.
*/
if (info->attrs[NL80211_ATTR_SSID]) {
params.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
params.ssid_len =
nla_len(info->attrs[NL80211_ATTR_SSID]);
if (params.ssid_len == 0 ||
params.ssid_len > IEEE80211_MAX_SSID_LEN)
return -EINVAL;
}
if (info->attrs[NL80211_ATTR_HIDDEN_SSID]) {
params.hidden_ssid = nla_get_u32(
info->attrs[NL80211_ATTR_HIDDEN_SSID]);
if (params.hidden_ssid !=
NL80211_HIDDEN_SSID_NOT_IN_USE &&
params.hidden_ssid !=
NL80211_HIDDEN_SSID_ZERO_LEN &&
params.hidden_ssid !=
NL80211_HIDDEN_SSID_ZERO_CONTENTS)
return -EINVAL;
}
call = rdev->ops->add_beacon;
break;
case NL80211_CMD_SET_BEACON: