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cfg80211: Support multiple CSA counters

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Change the type of NL80211_ATTR_CSA_C_OFF_BEACON and
NL80211_ATTR_CSA_C_OFF_PRESP to be NLA_BINARY which allows
userspace to use beacons and probe responses with
multiple CSA counters.
This isn't breaking the API since userspace can
continue to use nla_put_u16 for this attributes, which
is equivalent to a single element u16 array.
In addition advertise max number of supported CSA counters.
This is needed when using CSA and eCSA IEs together.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Andrei Otcheretianski 2014-05-09 14:11:46 +03:00 committed by Johannes Berg
parent 387910cc79
commit 9a774c78e2
6 changed files with 96 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
include/net/cfg80211.h
View File

@ -694,8 +694,10 @@ struct cfg80211_ap_settings {
*
* @chandef: defines the channel to use after the switch
* @beacon_csa: beacon data while performing the switch
* @counter_offset_beacon: offset for the counter within the beacon (tail)
* @counter_offset_presp: offset for the counter within the probe response
* @counter_offsets_beacon: offsets of the counters within the beacon (tail)
* @counter_offsets_presp: offsets of the counters within the probe response
* @n_counter_offsets_beacon: number of csa counters the beacon (tail)
* @n_counter_offsets_presp: number of csa counters in the probe response
* @beacon_after: beacon data to be used on the new channel
* @radar_required: whether radar detection is required on the new channel
* @block_tx: whether transmissions should be blocked while changing
@ -704,7 +706,10 @@ struct cfg80211_ap_settings {
struct cfg80211_csa_settings {
struct cfg80211_chan_def chandef;
struct cfg80211_beacon_data beacon_csa;
u16 counter_offset_beacon, counter_offset_presp;
const u16 *counter_offsets_beacon;
const u16 *counter_offsets_presp;
unsigned int n_counter_offsets_beacon;
unsigned int n_counter_offsets_presp;
struct cfg80211_beacon_data beacon_after;
bool radar_required;
bool block_tx;
@ -3048,6 +3053,13 @@ struct wiphy {
u16 max_ap_assoc_sta;
/*
* Number of supported csa_counters in beacons and probe responses.
* This value should be set if the driver wishes to limit the number of
* csa counters. Default (0) means infinite.
*/
u8 max_num_csa_counters;
char priv[0] __aligned(NETDEV_ALIGN);
};

11
include/uapi/linux/nl80211.h
View File

@ -1528,10 +1528,10 @@ enum nl80211_commands {
* operation).
* @NL80211_ATTR_CSA_IES: Nested set of attributes containing the IE information
* for the time while performing a channel switch.
* @NL80211_ATTR_CSA_C_OFF_BEACON: Offset of the channel switch counter
* field in the beacons tail (%NL80211_ATTR_BEACON_TAIL).
* @NL80211_ATTR_CSA_C_OFF_PRESP: Offset of the channel switch counter
* field in the probe response (%NL80211_ATTR_PROBE_RESP).
* @NL80211_ATTR_CSA_C_OFF_BEACON: An array of offsets (u16) to the channel
* switch counters in the beacons tail (%NL80211_ATTR_BEACON_TAIL).
* @NL80211_ATTR_CSA_C_OFF_PRESP: An array of offsets (u16) to the channel
* switch counters in the probe response (%NL80211_ATTR_PROBE_RESP).
*
* @NL80211_ATTR_RXMGMT_FLAGS: flags for nl80211_send_mgmt(), u32.
* As specified in the &enum nl80211_rxmgmt_flags.
@ -1581,6 +1581,8 @@ enum nl80211_commands {
*
* @NL80211_ATTR_CSA_C_OFFSETS_TX: An array of csa counter offsets (u16) which
* should be updated when the frame is transmitted.
* @NL80211_ATTR_MAX_CSA_COUNTERS: U8 attribute used to advertise the maximum
* supported number of csa counters.
*
* @NL80211_ATTR_TDLS_PEER_CAPABILITY: flags for TDLS peer capabilities, u32.
* As specified in the &enum nl80211_tdls_peer_capability.
@ -1927,6 +1929,7 @@ enum nl80211_attrs {
NL80211_ATTR_IFACE_SOCKET_OWNER,
NL80211_ATTR_CSA_C_OFFSETS_TX,
NL80211_ATTR_MAX_CSA_COUNTERS,
/* add attributes here, update the policy in nl80211.c */

10
net/mac80211/cfg.c
View File

@ -3192,8 +3192,14 @@ static int ieee80211_set_csa_beacon(struct ieee80211_sub_if_data *sdata,
break;
sdata->csa_counter_offset_beacon =
params->counter_offset_beacon;
sdata->csa_counter_offset_presp = params->counter_offset_presp;
params->counter_offsets_beacon[0];
if (params->n_counter_offsets_presp)
sdata->csa_counter_offset_presp =
params->counter_offsets_presp[0];
else
sdata->csa_counter_offset_presp = 0;
err = ieee80211_assign_beacon(sdata, &params->beacon_csa);
if (err < 0) {
kfree(sdata->u.ap.next_beacon);

2
net/wireless/core.c
View File

@ -402,6 +402,8 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
rdev->wiphy.rts_threshold = (u32) -1;
rdev->wiphy.coverage_class = 0;
rdev->wiphy.max_num_csa_counters = 1;
return &rdev->wiphy;
}
EXPORT_SYMBOL(wiphy_new);

65
net/wireless/nl80211.c
View File

@ -371,8 +371,8 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_CH_SWITCH_COUNT] = { .type = NLA_U32 },
[NL80211_ATTR_CH_SWITCH_BLOCK_TX] = { .type = NLA_FLAG },
[NL80211_ATTR_CSA_IES] = { .type = NLA_NESTED },
[NL80211_ATTR_CSA_C_OFF_BEACON] = { .type = NLA_U16 },
[NL80211_ATTR_CSA_C_OFF_PRESP] = { .type = NLA_U16 },
[NL80211_ATTR_CSA_C_OFF_BEACON] = { .type = NLA_BINARY },
[NL80211_ATTR_CSA_C_OFF_PRESP] = { .type = NLA_BINARY },
[NL80211_ATTR_STA_SUPPORTED_CHANNELS] = { .type = NLA_BINARY },
[NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES] = { .type = NLA_BINARY },
[NL80211_ATTR_HANDLE_DFS] = { .type = NLA_FLAG },
@ -1670,6 +1670,13 @@ static int nl80211_send_wiphy(struct cfg80211_registered_device *rdev,
}
nla_nest_end(msg, nested);
}
state->split_start++;
break;
case 12:
if (rdev->wiphy.flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH &&
nla_put_u8(msg, NL80211_ATTR_MAX_CSA_COUNTERS,
rdev->wiphy.max_num_csa_counters))
goto nla_put_failure;
/* done */
state->split_start = 0;
@ -5864,6 +5871,7 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
u8 radar_detect_width = 0;
int err;
bool need_new_beacon = false;
int len, i;
if (!rdev->ops->channel_switch ||
!(rdev->wiphy.flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
@ -5922,26 +5930,55 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
if (!csa_attrs[NL80211_ATTR_CSA_C_OFF_BEACON])
return -EINVAL;
params.counter_offset_beacon =
nla_get_u16(csa_attrs[NL80211_ATTR_CSA_C_OFF_BEACON]);
if (params.counter_offset_beacon >= params.beacon_csa.tail_len)
len = nla_len(csa_attrs[NL80211_ATTR_CSA_C_OFF_BEACON]);
if (!len || (len % sizeof(u16)))
return -EINVAL;
/* sanity check - counters should be the same */
if (params.beacon_csa.tail[params.counter_offset_beacon] !=
params.count)
params.n_counter_offsets_beacon = len / sizeof(u16);
if (rdev->wiphy.max_num_csa_counters &&
(params.n_counter_offsets_beacon >
rdev->wiphy.max_num_csa_counters))
return -EINVAL;
params.counter_offsets_beacon =
nla_data(csa_attrs[NL80211_ATTR_CSA_C_OFF_BEACON]);
/* sanity checks - counters should fit and be the same */
for (i = 0; i < params.n_counter_offsets_beacon; i++) {
u16 offset = params.counter_offsets_beacon[i];
if (offset >= params.beacon_csa.tail_len)
return -EINVAL;
if (params.beacon_csa.tail[offset] != params.count)
return -EINVAL;
}
if (csa_attrs[NL80211_ATTR_CSA_C_OFF_PRESP]) {
params.counter_offset_presp =
nla_get_u16(csa_attrs[NL80211_ATTR_CSA_C_OFF_PRESP]);
if (params.counter_offset_presp >=
params.beacon_csa.probe_resp_len)
len = nla_len(csa_attrs[NL80211_ATTR_CSA_C_OFF_PRESP]);
if (!len || (len % sizeof(u16)))
return -EINVAL;
if (params.beacon_csa.probe_resp[params.counter_offset_presp] !=
params.count)
params.n_counter_offsets_presp = len / sizeof(u16);
if (rdev->wiphy.max_num_csa_counters &&
(params.n_counter_offsets_beacon >
rdev->wiphy.max_num_csa_counters))
return -EINVAL;
params.counter_offsets_presp =
nla_data(csa_attrs[NL80211_ATTR_CSA_C_OFF_PRESP]);
/* sanity checks - counters should fit and be the same */
for (i = 0; i < params.n_counter_offsets_presp; i++) {
u16 offset = params.counter_offsets_presp[i];
if (offset >= params.beacon_csa.probe_resp_len)
return -EINVAL;
if (params.beacon_csa.probe_resp[offset] !=
params.count)
return -EINVAL;
}
}
skip_beacons:

22
net/wireless/trace.h
View File

@ -1876,29 +1876,33 @@ TRACE_EVENT(rdev_channel_switch,
WIPHY_ENTRY
NETDEV_ENTRY
CHAN_DEF_ENTRY
__field(u16, counter_offset_beacon)
__field(u16, counter_offset_presp)
__field(bool, radar_required)
__field(bool, block_tx)
__field(u8, count)
__dynamic_array(u16, bcn_ofs, params->n_counter_offsets_beacon)
__dynamic_array(u16, pres_ofs, params->n_counter_offsets_presp)
),
TP_fast_assign(
WIPHY_ASSIGN;
NETDEV_ASSIGN;
CHAN_DEF_ASSIGN(&params->chandef);
__entry->counter_offset_beacon = params->counter_offset_beacon;
__entry->counter_offset_presp = params->counter_offset_presp;
__entry->radar_required = params->radar_required;
__entry->block_tx = params->block_tx;
__entry->count = params->count;
memcpy(__get_dynamic_array(bcn_ofs),
params->counter_offsets_beacon,
params->n_counter_offsets_beacon * sizeof(u16));
/* probe response offsets are optional */
if (params->n_counter_offsets_presp)
memcpy(__get_dynamic_array(pres_ofs),
params->counter_offsets_presp,
params->n_counter_offsets_presp * sizeof(u16));
),
TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", " CHAN_DEF_PR_FMT
", block_tx: %d, count: %u, radar_required: %d"
", counter offsets (beacon/presp): %u/%u",
", block_tx: %d, count: %u, radar_required: %d",
WIPHY_PR_ARG, NETDEV_PR_ARG, CHAN_DEF_PR_ARG,
__entry->block_tx, __entry->count, __entry->radar_required,
__entry->counter_offset_beacon,
__entry->counter_offset_presp)
__entry->block_tx, __entry->count, __entry->radar_required)
);
TRACE_EVENT(rdev_set_qos_map,