543 lines
12 KiB
C
543 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* Copyright (C) 2020-2022 Intel Corporation
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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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struct ieee80211_channel *channel)
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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->u.ibss.ssid_len)
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return;
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bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0,
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IEEE80211_BSS_TYPE_IBSS, IEEE80211_PRIVACY_ANY);
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if (WARN_ON(!bss))
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return;
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if (wdev->u.ibss.current_bss) {
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cfg80211_unhold_bss(wdev->u.ibss.current_bss);
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cfg80211_put_bss(wdev->wiphy, &wdev->u.ibss.current_bss->pub);
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}
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cfg80211_hold_bss(bss_from_pub(bss));
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wdev->u.ibss.current_bss = bss_from_pub(bss);
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if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
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cfg80211_upload_connect_keys(wdev);
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nl80211_send_ibss_bssid(wiphy_to_rdev(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,
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struct ieee80211_channel *channel, 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_rdev(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, channel);
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if (WARN_ON(!channel))
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return;
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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->ij.bssid, bssid, ETH_ALEN);
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ev->ij.channel = channel;
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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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lockdep_assert_held(&rdev->wiphy.mtx);
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ASSERT_WDEV_LOCK(wdev);
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if (wdev->u.ibss.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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enum nl80211_band band;
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u32 flag;
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int j;
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band = params->chandef.chan->band;
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if (band == NL80211_BAND_5GHZ ||
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band == NL80211_BAND_6GHZ)
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flag = IEEE80211_RATE_MANDATORY_A;
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else
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flag = IEEE80211_RATE_MANDATORY_B;
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sband = rdev->wiphy.bands[band];
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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(connkeys && connkeys->def < 0))
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return -EINVAL;
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if (WARN_ON(wdev->connect_keys))
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kfree_sensitive(wdev->connect_keys);
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wdev->connect_keys = connkeys;
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wdev->u.ibss.chandef = params->chandef;
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if (connkeys) {
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params->wep_keys = connkeys->params;
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params->wep_tx_key = connkeys->def;
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}
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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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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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return err;
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}
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memcpy(wdev->u.ibss.ssid, params->ssid, params->ssid_len);
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wdev->u.ibss.ssid_len = params->ssid_len;
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return 0;
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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_rdev(wdev->wiphy);
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int i;
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ASSERT_WDEV_LOCK(wdev);
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kfree_sensitive(wdev->connect_keys);
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wdev->connect_keys = NULL;
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rdev_set_qos_map(rdev, dev, 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, -1, i, false, NULL);
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if (wdev->u.ibss.current_bss) {
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cfg80211_unhold_bss(wdev->u.ibss.current_bss);
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cfg80211_put_bss(wdev->wiphy, &wdev->u.ibss.current_bss->pub);
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}
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wdev->u.ibss.current_bss = NULL;
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wdev->u.ibss.ssid_len = 0;
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memset(&wdev->u.ibss.chandef, 0, sizeof(wdev->u.ibss.chandef));
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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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cfg80211_sched_dfs_chan_update(rdev);
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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->u.ibss.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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wdev->conn_owner_nlportid = 0;
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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 nl80211_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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struct ieee80211_channel *new_chan = NULL;
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for (band = 0; band < NUM_NL80211_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_IR)
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continue;
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if (chan->flags & IEEE80211_CHAN_DISABLED)
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continue;
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new_chan = chan;
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break;
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}
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if (new_chan)
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break;
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}
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if (!new_chan)
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return -EINVAL;
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cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
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NL80211_CHAN_NO_HT);
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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.ibss.privacy = wdev->wext.default_key != -1;
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if (wdev->wext.keys && wdev->wext.keys->def != -1) {
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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 < CFG80211_MAX_WEP_KEYS; 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_rdev(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(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_IR ||
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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->u.ibss.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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cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
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NL80211_CHAN_NO_HT);
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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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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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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->u.ibss.current_bss)
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chan = wdev->u.ibss.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_rdev(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->u.ibss.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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memcpy(wdev->u.ibss.ssid, ssid, len);
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wdev->wext.ibss.ssid = wdev->u.ibss.ssid;
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wdev->wext.ibss.ssid_len = len;
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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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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->u.ibss.ssid_len) {
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data->flags = 1;
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data->length = wdev->u.ibss.ssid_len;
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memcpy(ssid, wdev->u.ibss.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_rdev(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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if (bssid && !is_valid_ether_addr(bssid))
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return -EINVAL;
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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 &&
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ether_addr_equal(bssid, wdev->wext.ibss.bssid))
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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->u.ibss.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 (bssid) {
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memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
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wdev->wext.ibss.bssid = wdev->wext.bssid;
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} else
|
|
wdev->wext.ibss.bssid = NULL;
|
|
|
|
wdev_lock(wdev);
|
|
err = cfg80211_ibss_wext_join(rdev, wdev);
|
|
wdev_unlock(wdev);
|
|
|
|
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->u.ibss.current_bss)
|
|
memcpy(ap_addr->sa_data, wdev->u.ibss.current_bss->pub.bssid,
|
|
ETH_ALEN);
|
|
else if (wdev->wext.ibss.bssid)
|
|
memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
|
|
else
|
|
eth_zero_addr(ap_addr->sa_data);
|
|
|
|
wdev_unlock(wdev);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|