![Johannes Berg](/assets/img/avatar_default.png)
Change nl80211 to support specifying a VHT (or HT) using the control channel frequency (as before) and new attributes for the channel width and first and second center frequency. The old channel type is of course still supported for HT. Also change the cfg80211 channel definition struct to support these by adding the relevant fields to it (and removing the _type field.) This also adds new helper functions: - cfg80211_chandef_create to create a channel def struct given the control channel and channel type, - cfg80211_chandef_identical to check if two channel definitions are identical - cfg80211_chandef_compatible to check if the given channel definitions are compatible, and return the wider of the two This isn't entirely complete, but that doesn't matter until we have a driver using it. In particular, it's missing - regulatory checks on the usable bandwidth (if that even makes sense) - regulatory TX power (database can't deal with it) - a proper channel compatibility calculation for the new channel types Signed-off-by: Johannes Berg <johannes.berg@intel.com>
549 lines
12 KiB
C
549 lines
12 KiB
C
/*
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* Some IBSS support code for cfg80211.
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*
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/cfg80211.h>
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#include "wext-compat.h"
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#include "nl80211.h"
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#include "rdev-ops.h"
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void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_bss *bss;
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#ifdef CONFIG_CFG80211_WEXT
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union iwreq_data wrqu;
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#endif
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return;
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if (!wdev->ssid_len)
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return;
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bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
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wdev->ssid, wdev->ssid_len,
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WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
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if (WARN_ON(!bss))
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return;
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if (wdev->current_bss) {
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cfg80211_unhold_bss(wdev->current_bss);
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cfg80211_put_bss(&wdev->current_bss->pub);
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}
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cfg80211_hold_bss(bss_from_pub(bss));
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wdev->current_bss = bss_from_pub(bss);
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wdev->sme_state = CFG80211_SME_CONNECTED;
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cfg80211_upload_connect_keys(wdev);
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nl80211_send_ibss_bssid(wiphy_to_dev(wdev->wiphy), dev, bssid,
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GFP_KERNEL);
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#ifdef CONFIG_CFG80211_WEXT
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memset(&wrqu, 0, sizeof(wrqu));
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memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
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wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
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#endif
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}
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void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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struct cfg80211_event *ev;
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unsigned long flags;
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trace_cfg80211_ibss_joined(dev, bssid);
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CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
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ev = kzalloc(sizeof(*ev), gfp);
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if (!ev)
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return;
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ev->type = EVENT_IBSS_JOINED;
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memcpy(ev->cr.bssid, bssid, ETH_ALEN);
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spin_lock_irqsave(&wdev->event_lock, flags);
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list_add_tail(&ev->list, &wdev->event_list);
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spin_unlock_irqrestore(&wdev->event_lock, flags);
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queue_work(cfg80211_wq, &rdev->event_work);
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}
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EXPORT_SYMBOL(cfg80211_ibss_joined);
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int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
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struct net_device *dev,
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struct cfg80211_ibss_params *params,
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struct cfg80211_cached_keys *connkeys)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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ASSERT_WDEV_LOCK(wdev);
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if (wdev->ssid_len)
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return -EALREADY;
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if (!params->basic_rates) {
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/*
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* If no rates were explicitly configured,
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* use the mandatory rate set for 11b or
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* 11a for maximum compatibility.
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*/
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struct ieee80211_supported_band *sband =
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rdev->wiphy.bands[params->chandef.chan->band];
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int j;
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u32 flag = params->chandef.chan->band == IEEE80211_BAND_5GHZ ?
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IEEE80211_RATE_MANDATORY_A :
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IEEE80211_RATE_MANDATORY_B;
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for (j = 0; j < sband->n_bitrates; j++) {
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if (sband->bitrates[j].flags & flag)
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params->basic_rates |= BIT(j);
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}
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}
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if (WARN_ON(wdev->connect_keys))
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kfree(wdev->connect_keys);
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wdev->connect_keys = connkeys;
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wdev->ibss_fixed = params->channel_fixed;
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#ifdef CONFIG_CFG80211_WEXT
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wdev->wext.ibss.chandef = params->chandef;
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#endif
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wdev->sme_state = CFG80211_SME_CONNECTING;
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err = cfg80211_can_use_chan(rdev, wdev, params->chandef.chan,
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params->channel_fixed
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? CHAN_MODE_SHARED
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: CHAN_MODE_EXCLUSIVE);
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if (err) {
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wdev->connect_keys = NULL;
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return err;
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}
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err = rdev_join_ibss(rdev, dev, params);
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if (err) {
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wdev->connect_keys = NULL;
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wdev->sme_state = CFG80211_SME_IDLE;
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return err;
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}
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memcpy(wdev->ssid, params->ssid, params->ssid_len);
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wdev->ssid_len = params->ssid_len;
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return 0;
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}
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int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
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struct net_device *dev,
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struct cfg80211_ibss_params *params,
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struct cfg80211_cached_keys *connkeys)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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mutex_lock(&rdev->devlist_mtx);
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wdev_lock(wdev);
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err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
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wdev_unlock(wdev);
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mutex_unlock(&rdev->devlist_mtx);
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return err;
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}
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static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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int i;
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ASSERT_WDEV_LOCK(wdev);
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kfree(wdev->connect_keys);
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wdev->connect_keys = NULL;
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/*
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* Delete all the keys ... pairwise keys can't really
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* exist any more anyway, but default keys might.
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*/
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if (rdev->ops->del_key)
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for (i = 0; i < 6; i++)
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rdev_del_key(rdev, dev, i, false, NULL);
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if (wdev->current_bss) {
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cfg80211_unhold_bss(wdev->current_bss);
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cfg80211_put_bss(&wdev->current_bss->pub);
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}
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wdev->current_bss = NULL;
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wdev->sme_state = CFG80211_SME_IDLE;
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wdev->ssid_len = 0;
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#ifdef CONFIG_CFG80211_WEXT
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if (!nowext)
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wdev->wext.ibss.ssid_len = 0;
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#endif
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}
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void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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wdev_lock(wdev);
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__cfg80211_clear_ibss(dev, nowext);
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wdev_unlock(wdev);
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}
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int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
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struct net_device *dev, bool nowext)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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ASSERT_WDEV_LOCK(wdev);
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if (!wdev->ssid_len)
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return -ENOLINK;
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err = rdev_leave_ibss(rdev, dev);
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if (err)
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return err;
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__cfg80211_clear_ibss(dev, nowext);
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return 0;
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}
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int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
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struct net_device *dev, bool nowext)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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int err;
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wdev_lock(wdev);
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err = __cfg80211_leave_ibss(rdev, dev, nowext);
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wdev_unlock(wdev);
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return err;
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}
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#ifdef CONFIG_CFG80211_WEXT
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int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
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struct wireless_dev *wdev)
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{
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struct cfg80211_cached_keys *ck = NULL;
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enum ieee80211_band band;
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int i, err;
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ASSERT_WDEV_LOCK(wdev);
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if (!wdev->wext.ibss.beacon_interval)
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wdev->wext.ibss.beacon_interval = 100;
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/* try to find an IBSS channel if none requested ... */
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if (!wdev->wext.ibss.chandef.chan) {
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wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
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for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
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struct ieee80211_supported_band *sband;
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struct ieee80211_channel *chan;
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sband = rdev->wiphy.bands[band];
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if (!sband)
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continue;
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for (i = 0; i < sband->n_channels; i++) {
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chan = &sband->channels[i];
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if (chan->flags & IEEE80211_CHAN_NO_IBSS)
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continue;
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if (chan->flags & IEEE80211_CHAN_DISABLED)
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continue;
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wdev->wext.ibss.chandef.chan = chan;
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break;
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}
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if (wdev->wext.ibss.chandef.chan)
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break;
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}
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if (!wdev->wext.ibss.chandef.chan)
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return -EINVAL;
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}
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/* don't join -- SSID is not there */
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if (!wdev->wext.ibss.ssid_len)
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return 0;
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if (!netif_running(wdev->netdev))
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return 0;
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if (wdev->wext.keys) {
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wdev->wext.keys->def = wdev->wext.default_key;
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wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
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}
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wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
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if (wdev->wext.keys) {
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ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
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if (!ck)
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return -ENOMEM;
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for (i = 0; i < 6; i++)
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ck->params[i].key = ck->data[i];
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}
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err = __cfg80211_join_ibss(rdev, wdev->netdev,
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&wdev->wext.ibss, ck);
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if (err)
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kfree(ck);
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return err;
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}
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int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_freq *wextfreq, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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struct ieee80211_channel *chan = NULL;
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int err, freq;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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if (!rdev->ops->join_ibss)
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return -EOPNOTSUPP;
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freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
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if (freq < 0)
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return freq;
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if (freq) {
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chan = ieee80211_get_channel(wdev->wiphy, freq);
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if (!chan)
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return -EINVAL;
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if (chan->flags & IEEE80211_CHAN_NO_IBSS ||
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chan->flags & IEEE80211_CHAN_DISABLED)
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return -EINVAL;
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}
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if (wdev->wext.ibss.chandef.chan == chan)
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return 0;
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wdev_lock(wdev);
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err = 0;
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if (wdev->ssid_len)
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err = __cfg80211_leave_ibss(rdev, dev, true);
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wdev_unlock(wdev);
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if (err)
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return err;
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if (chan) {
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wdev->wext.ibss.chandef.chan = chan;
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wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
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wdev->wext.ibss.channel_fixed = true;
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} else {
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/* cfg80211_ibss_wext_join will pick one if needed */
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wdev->wext.ibss.channel_fixed = false;
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}
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mutex_lock(&rdev->devlist_mtx);
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wdev_lock(wdev);
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err = cfg80211_ibss_wext_join(rdev, wdev);
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wdev_unlock(wdev);
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mutex_unlock(&rdev->devlist_mtx);
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return err;
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}
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int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_freq *freq, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct ieee80211_channel *chan = NULL;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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wdev_lock(wdev);
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if (wdev->current_bss)
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chan = wdev->current_bss->pub.channel;
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else if (wdev->wext.ibss.chandef.chan)
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chan = wdev->wext.ibss.chandef.chan;
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wdev_unlock(wdev);
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if (chan) {
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freq->m = chan->center_freq;
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freq->e = 6;
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return 0;
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}
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/* no channel if not joining */
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return -EINVAL;
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}
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int cfg80211_ibss_wext_siwessid(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_point *data, char *ssid)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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size_t len = data->length;
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int err;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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if (!rdev->ops->join_ibss)
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return -EOPNOTSUPP;
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wdev_lock(wdev);
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err = 0;
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if (wdev->ssid_len)
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err = __cfg80211_leave_ibss(rdev, dev, true);
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wdev_unlock(wdev);
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if (err)
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return err;
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/* iwconfig uses nul termination in SSID.. */
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if (len > 0 && ssid[len - 1] == '\0')
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len--;
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wdev->wext.ibss.ssid = wdev->ssid;
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memcpy(wdev->wext.ibss.ssid, ssid, len);
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wdev->wext.ibss.ssid_len = len;
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mutex_lock(&rdev->devlist_mtx);
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wdev_lock(wdev);
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err = cfg80211_ibss_wext_join(rdev, wdev);
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wdev_unlock(wdev);
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mutex_unlock(&rdev->devlist_mtx);
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return err;
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}
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int cfg80211_ibss_wext_giwessid(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_point *data, char *ssid)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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data->flags = 0;
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wdev_lock(wdev);
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if (wdev->ssid_len) {
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data->flags = 1;
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data->length = wdev->ssid_len;
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memcpy(ssid, wdev->ssid, data->length);
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} else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
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data->flags = 1;
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data->length = wdev->wext.ibss.ssid_len;
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memcpy(ssid, wdev->wext.ibss.ssid, data->length);
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}
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wdev_unlock(wdev);
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return 0;
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}
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int cfg80211_ibss_wext_siwap(struct net_device *dev,
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struct iw_request_info *info,
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struct sockaddr *ap_addr, char *extra)
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{
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struct wireless_dev *wdev = dev->ieee80211_ptr;
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
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u8 *bssid = ap_addr->sa_data;
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int err;
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/* call only for ibss! */
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if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
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return -EINVAL;
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if (!rdev->ops->join_ibss)
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return -EOPNOTSUPP;
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if (ap_addr->sa_family != ARPHRD_ETHER)
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return -EINVAL;
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/* automatic mode */
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if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
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bssid = NULL;
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/* both automatic */
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if (!bssid && !wdev->wext.ibss.bssid)
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return 0;
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/* fixed already - and no change */
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if (wdev->wext.ibss.bssid && bssid &&
|
|
ether_addr_equal(bssid, wdev->wext.ibss.bssid))
|
|
return 0;
|
|
|
|
wdev_lock(wdev);
|
|
err = 0;
|
|
if (wdev->ssid_len)
|
|
err = __cfg80211_leave_ibss(rdev, dev, true);
|
|
wdev_unlock(wdev);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
if (bssid) {
|
|
memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
|
|
wdev->wext.ibss.bssid = wdev->wext.bssid;
|
|
} else
|
|
wdev->wext.ibss.bssid = NULL;
|
|
|
|
mutex_lock(&rdev->devlist_mtx);
|
|
wdev_lock(wdev);
|
|
err = cfg80211_ibss_wext_join(rdev, wdev);
|
|
wdev_unlock(wdev);
|
|
mutex_unlock(&rdev->devlist_mtx);
|
|
|
|
return err;
|
|
}
|
|
|
|
int cfg80211_ibss_wext_giwap(struct net_device *dev,
|
|
struct iw_request_info *info,
|
|
struct sockaddr *ap_addr, char *extra)
|
|
{
|
|
struct wireless_dev *wdev = dev->ieee80211_ptr;
|
|
|
|
/* call only for ibss! */
|
|
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
|
|
return -EINVAL;
|
|
|
|
ap_addr->sa_family = ARPHRD_ETHER;
|
|
|
|
wdev_lock(wdev);
|
|
if (wdev->current_bss)
|
|
memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
|
|
else if (wdev->wext.ibss.bssid)
|
|
memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
|
|
else
|
|
memset(ap_addr->sa_data, 0, ETH_ALEN);
|
|
|
|
wdev_unlock(wdev);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|