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mac80211: adding 802.11n IEs handling
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This patch presents the ability to parse and compose HT IEs, and to put
the IE relevant data inside the mac80211's internal HT structures

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Ron Rindjunsky authored and David S. Miller committed Jan 28, 2008
1 parent 10816d4 commit c715350
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Showing 2 changed files with 94 additions and 3 deletions.
8 changes: 7 additions & 1 deletion net/mac80211/ieee80211_i.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,8 @@ struct ieee80211_sta_bss {
size_t rsn_ie_len;
u8 *wmm_ie;
size_t wmm_ie_len;
u8 *ht_ie;
size_t ht_ie_len;
#define IEEE80211_MAX_SUPP_RATES 32
u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
size_t supp_rates_len;
Expand Down Expand Up @@ -759,7 +761,11 @@ int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason);
int ieee80211_sta_disassociate(struct net_device *dev, u16 reason);
void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes);
void ieee80211_reset_erp_info(struct net_device *dev);

int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
struct ieee80211_ht_info *ht_info);
int ieee80211_ht_addt_info_ie_to_ht_bss_info(
struct ieee80211_ht_addt_info *ht_add_info_ie,
struct ieee80211_ht_bss_info *bss_info);
/* ieee80211_iface.c */
int ieee80211_if_add(struct net_device *dev, const char *name,
struct net_device **new_dev, int type);
Expand Down
89 changes: 87 additions & 2 deletions net/mac80211/ieee80211_sta.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -90,7 +90,8 @@ struct ieee802_11_elems {
u8 *ext_supp_rates;
u8 *wmm_info;
u8 *wmm_param;

u8 *ht_cap_elem;
u8 *ht_info_elem;
/* length of them, respectively */
u8 ssid_len;
u8 supp_rates_len;
Expand All @@ -106,6 +107,8 @@ struct ieee802_11_elems {
u8 ext_supp_rates_len;
u8 wmm_info_len;
u8 wmm_param_len;
u8 ht_cap_elem_len;
u8 ht_info_elem_len;
};

static void ieee802_11_parse_elems(u8 *start, size_t len,
Expand Down Expand Up @@ -190,6 +193,14 @@ static void ieee802_11_parse_elems(u8 *start, size_t len,
elems->ext_supp_rates = pos;
elems->ext_supp_rates_len = elen;
break;
case WLAN_EID_HT_CAPABILITY:
elems->ht_cap_elem = pos;
elems->ht_cap_elem_len = elen;
break;
case WLAN_EID_HT_EXTRA_INFO:
elems->ht_info_elem = pos;
elems->ht_info_elem_len = elen;
break;
default:
break;
}
Expand Down Expand Up @@ -332,6 +343,51 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
ieee80211_erp_info_change_notify(dev, changes);
}

int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
struct ieee80211_ht_info *ht_info)
{

if (ht_info == NULL)
return -EINVAL;

memset(ht_info, 0, sizeof(*ht_info));

if (ht_cap_ie) {
u8 ampdu_info = ht_cap_ie->ampdu_params_info;

ht_info->ht_supported = 1;
ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
ht_info->ampdu_factor =
ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
ht_info->ampdu_density =
(ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
} else
ht_info->ht_supported = 0;

return 0;
}

int ieee80211_ht_addt_info_ie_to_ht_bss_info(
struct ieee80211_ht_addt_info *ht_add_info_ie,
struct ieee80211_ht_bss_info *bss_info)
{
if (bss_info == NULL)
return -EINVAL;

memset(bss_info, 0, sizeof(*bss_info));

if (ht_add_info_ie) {
u16 op_mode;
op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);

bss_info->primary_channel = ht_add_info_ie->control_chan;
bss_info->bss_cap = ht_add_info_ie->ht_param;
bss_info->bss_op_mode = (u8)(op_mode & 0xff);
}

return 0;
}

static void ieee80211_sta_send_associnfo(struct net_device *dev,
struct ieee80211_if_sta *ifsta)
Expand Down Expand Up @@ -630,6 +686,19 @@ static void ieee80211_send_assoc(struct net_device *dev,
*pos++ = 1; /* WME ver */
*pos++ = 0;
}
/* wmm support is a must to HT */
if (wmm && mode->ht_info.ht_supported) {
__le16 tmp = cpu_to_le16(mode->ht_info.cap);
pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
*pos++ = WLAN_EID_HT_CAPABILITY;
*pos++ = sizeof(struct ieee80211_ht_cap);
memset(pos, 0, sizeof(struct ieee80211_ht_cap));
memcpy(pos, &tmp, sizeof(u16));
pos += sizeof(u16);
*pos++ = (mode->ht_info.ampdu_factor |
(mode->ht_info.ampdu_density << 2));
memcpy(pos, mode->ht_info.supp_mcs_set, 16);
}

kfree(ifsta->assocreq_ies);
ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
Expand Down Expand Up @@ -1380,6 +1449,7 @@ static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
kfree(bss->wpa_ie);
kfree(bss->rsn_ie);
kfree(bss->wmm_ie);
kfree(bss->ht_ie);
kfree(bss);
}

Expand Down Expand Up @@ -1637,7 +1707,22 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
bss->wmm_ie = NULL;
bss->wmm_ie_len = 0;
}

if (elems.ht_cap_elem &&
(!bss->ht_ie || bss->ht_ie_len != elems.ht_cap_elem_len ||
memcmp(bss->ht_ie, elems.ht_cap_elem, elems.ht_cap_elem_len))) {
kfree(bss->ht_ie);
bss->ht_ie = kmalloc(elems.ht_cap_elem_len + 2, GFP_ATOMIC);
if (bss->ht_ie) {
memcpy(bss->ht_ie, elems.ht_cap_elem - 2,
elems.ht_cap_elem_len + 2);
bss->ht_ie_len = elems.ht_cap_elem_len + 2;
} else
bss->ht_ie_len = 0;
} else if (!elems.ht_cap_elem && bss->ht_ie) {
kfree(bss->ht_ie);
bss->ht_ie = NULL;
bss->ht_ie_len = 0;
}

bss->hw_mode = rx_status->phymode;
bss->freq = rx_status->freq;
Expand Down

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