diff options
Diffstat (limited to 'net/wireless/scan.c')
| -rw-r--r-- | net/wireless/scan.c | 1197 |
1 files changed, 1197 insertions, 0 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c new file mode 100644 index 00000000..cbbc9273 --- /dev/null +++ b/net/wireless/scan.c @@ -0,0 +1,1197 @@ +/* + * cfg80211 scan result handling + * + * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> + */ +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/wireless.h> +#include <linux/nl80211.h> +#include <linux/etherdevice.h> +#include <net/arp.h> +#include <net/cfg80211.h> +#include <net/iw_handler.h> +#include "core.h" +#include "nl80211.h" +#include "wext-compat.h" + +#define IEEE80211_SCAN_RESULT_EXPIRE (3 * HZ) + +void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) +{ + struct cfg80211_scan_request *request; + struct net_device *dev; +#ifdef CONFIG_CFG80211_WEXT + union iwreq_data wrqu; +#endif + + ASSERT_RDEV_LOCK(rdev); + + request = rdev->scan_req; + + if (!request) + return; + + dev = request->dev; + + /* + * This must be before sending the other events! + * Otherwise, wpa_supplicant gets completely confused with + * wext events. + */ + cfg80211_sme_scan_done(dev); + + if (request->aborted) + nl80211_send_scan_aborted(rdev, dev); + else + nl80211_send_scan_done(rdev, dev); + +#ifdef CONFIG_CFG80211_WEXT + if (!request->aborted) { + memset(&wrqu, 0, sizeof(wrqu)); + + wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); + } +#endif + + dev_put(dev); + + rdev->scan_req = NULL; + + /* + * OK. If this is invoked with "leak" then we can't + * free this ... but we've cleaned it up anyway. The + * driver failed to call the scan_done callback, so + * all bets are off, it might still be trying to use + * the scan request or not ... if it accesses the dev + * in there (it shouldn't anyway) then it may crash. + */ + if (!leak) + kfree(request); +} + +void __cfg80211_scan_done(struct work_struct *wk) +{ + struct cfg80211_registered_device *rdev; + + rdev = container_of(wk, struct cfg80211_registered_device, + scan_done_wk); + + cfg80211_lock_rdev(rdev); + ___cfg80211_scan_done(rdev, false); + cfg80211_unlock_rdev(rdev); +} + +void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) +{ + WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); + + request->aborted = aborted; + queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); +} +EXPORT_SYMBOL(cfg80211_scan_done); + +void __cfg80211_sched_scan_results(struct work_struct *wk) +{ + struct cfg80211_registered_device *rdev; + + rdev = container_of(wk, struct cfg80211_registered_device, + sched_scan_results_wk); + + mutex_lock(&rdev->sched_scan_mtx); + + /* we don't have sched_scan_req anymore if the scan is stopping */ + if (rdev->sched_scan_req) + nl80211_send_sched_scan_results(rdev, + rdev->sched_scan_req->dev); + + mutex_unlock(&rdev->sched_scan_mtx); +} + +void cfg80211_sched_scan_results(struct wiphy *wiphy) +{ + /* ignore if we're not scanning */ + if (wiphy_to_dev(wiphy)->sched_scan_req) + queue_work(cfg80211_wq, + &wiphy_to_dev(wiphy)->sched_scan_results_wk); +} +EXPORT_SYMBOL(cfg80211_sched_scan_results); + +void cfg80211_sched_scan_stopped(struct wiphy *wiphy) +{ + struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); + + mutex_lock(&rdev->sched_scan_mtx); + __cfg80211_stop_sched_scan(rdev, true); + mutex_unlock(&rdev->sched_scan_mtx); +} +EXPORT_SYMBOL(cfg80211_sched_scan_stopped); + +int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, + bool driver_initiated) +{ + int err; + struct net_device *dev; + + lockdep_assert_held(&rdev->sched_scan_mtx); + + if (!rdev->sched_scan_req) + return 0; + + dev = rdev->sched_scan_req->dev; + + if (!driver_initiated) { + err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev); + if (err) + return err; + } + + nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); + + kfree(rdev->sched_scan_req); + rdev->sched_scan_req = NULL; + + return err; +} + +static void bss_release(struct kref *ref) +{ + struct cfg80211_internal_bss *bss; + + bss = container_of(ref, struct cfg80211_internal_bss, ref); + if (bss->pub.free_priv) + bss->pub.free_priv(&bss->pub); + + if (bss->beacon_ies_allocated) + kfree(bss->pub.beacon_ies); + if (bss->proberesp_ies_allocated) + kfree(bss->pub.proberesp_ies); + + BUG_ON(atomic_read(&bss->hold)); + + kfree(bss); +} + +/* must hold dev->bss_lock! */ +void cfg80211_bss_age(struct cfg80211_registered_device *dev, + unsigned long age_secs) +{ + struct cfg80211_internal_bss *bss; + unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); + + list_for_each_entry(bss, &dev->bss_list, list) { + bss->ts -= age_jiffies; + } +} + +/* must hold dev->bss_lock! */ +static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, + struct cfg80211_internal_bss *bss) +{ + list_del_init(&bss->list); + rb_erase(&bss->rbn, &dev->bss_tree); + kref_put(&bss->ref, bss_release); +} + +/* must hold dev->bss_lock! */ +void cfg80211_bss_expire(struct cfg80211_registered_device *dev) +{ + struct cfg80211_internal_bss *bss, *tmp; + bool expired = false; + + list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { + if (atomic_read(&bss->hold)) + continue; + if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) + continue; + __cfg80211_unlink_bss(dev, bss); + expired = true; + } + + if (expired) + dev->bss_generation++; +} + +const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) +{ + while (len > 2 && ies[0] != eid) { + len -= ies[1] + 2; + ies += ies[1] + 2; + } + if (len < 2) + return NULL; + if (len < 2 + ies[1]) + return NULL; + return ies; +} +EXPORT_SYMBOL(cfg80211_find_ie); + +static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) +{ + const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); + const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); + int r; + + if (!ie1 && !ie2) + return 0; + if (!ie1 || !ie2) + return -1; + + r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); + if (r == 0 && ie1[1] != ie2[1]) + return ie2[1] - ie1[1]; + return r; +} + +static bool is_bss(struct cfg80211_bss *a, + const u8 *bssid, + const u8 *ssid, size_t ssid_len) +{ + const u8 *ssidie; + + if (bssid && compare_ether_addr(a->bssid, bssid)) + return false; + + if (!ssid) + return true; + + ssidie = cfg80211_find_ie(WLAN_EID_SSID, + a->information_elements, + a->len_information_elements); + if (!ssidie) + return false; + if (ssidie[1] != ssid_len) + return false; + return memcmp(ssidie + 2, ssid, ssid_len) == 0; +} + +static bool is_mesh_bss(struct cfg80211_bss *a) +{ + const u8 *ie; + + if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) + return false; + + ie = cfg80211_find_ie(WLAN_EID_MESH_ID, + a->information_elements, + a->len_information_elements); + if (!ie) + return false; + + ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, + a->information_elements, + a->len_information_elements); + if (!ie) + return false; + + return true; +} + +static bool is_mesh(struct cfg80211_bss *a, + const u8 *meshid, size_t meshidlen, + const u8 *meshcfg) +{ + const u8 *ie; + + if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) + return false; + + ie = cfg80211_find_ie(WLAN_EID_MESH_ID, + a->information_elements, + a->len_information_elements); + if (!ie) + return false; + if (ie[1] != meshidlen) + return false; + if (memcmp(ie + 2, meshid, meshidlen)) + return false; + + ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, + a->information_elements, + a->len_information_elements); + if (!ie) + return false; + if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) + return false; + + /* + * Ignore mesh capability (last two bytes of the IE) when + * comparing since that may differ between stations taking + * part in the same mesh. + */ + return memcmp(ie + 2, meshcfg, + sizeof(struct ieee80211_meshconf_ie) - 2) == 0; +} + +static int cmp_bss(struct cfg80211_bss *a, + struct cfg80211_bss *b) +{ + int r; + + if (a->channel != b->channel) + return b->channel->center_freq - a->channel->center_freq; + + if (is_mesh_bss(a) && is_mesh_bss(b)) { + r = cmp_ies(WLAN_EID_MESH_ID, + a->information_elements, + a->len_information_elements, + b->information_elements, + b->len_information_elements); + if (r) + return r; + return cmp_ies(WLAN_EID_MESH_CONFIG, + a->information_elements, + a->len_information_elements, + b->information_elements, + b->len_information_elements); + } + + r = memcmp(a->bssid, b->bssid, ETH_ALEN); + if (r) + return r; + + return cmp_ies(WLAN_EID_SSID, + a->information_elements, + a->len_information_elements, + b->information_elements, + b->len_information_elements); +} + +struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, + struct ieee80211_channel *channel, + const u8 *bssid, + const u8 *ssid, size_t ssid_len, + u16 capa_mask, u16 capa_val) +{ + struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); + struct cfg80211_internal_bss *bss, *res = NULL; + unsigned long now = jiffies; + + spin_lock_bh(&dev->bss_lock); + + list_for_each_entry(bss, &dev->bss_list, list) { + if ((bss->pub.capability & capa_mask) != capa_val) + continue; + if (channel && bss->pub.channel != channel) + continue; + /* Don't get expired BSS structs */ + if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && + !atomic_read(&bss->hold)) + continue; + if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { + res = bss; + kref_get(&res->ref); + break; + } + } + + spin_unlock_bh(&dev->bss_lock); + if (!res) + return NULL; + return &res->pub; +} +EXPORT_SYMBOL(cfg80211_get_bss); + +struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, + struct ieee80211_channel *channel, + const u8 *meshid, size_t meshidlen, + const u8 *meshcfg) +{ + struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); + struct cfg80211_internal_bss *bss, *res = NULL; + + spin_lock_bh(&dev->bss_lock); + + list_for_each_entry(bss, &dev->bss_list, list) { + if (channel && bss->pub.channel != channel) + continue; + if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { + res = bss; + kref_get(&res->ref); + break; + } + } + + spin_unlock_bh(&dev->bss_lock); + if (!res) + return NULL; + return &res->pub; +} +EXPORT_SYMBOL(cfg80211_get_mesh); + + +static void rb_insert_bss(struct cfg80211_registered_device *dev, + struct cfg80211_internal_bss *bss) +{ + struct rb_node **p = &dev->bss_tree.rb_node; + struct rb_node *parent = NULL; + struct cfg80211_internal_bss *tbss; + int cmp; + + while (*p) { + parent = *p; + tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); + + cmp = cmp_bss(&bss->pub, &tbss->pub); + + if (WARN_ON(!cmp)) { + /* will sort of leak this BSS */ + return; + } + + if (cmp < 0) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + } + + rb_link_node(&bss->rbn, parent, p); + rb_insert_color(&bss->rbn, &dev->bss_tree); +} + +static struct cfg80211_internal_bss * +rb_find_bss(struct cfg80211_registered_device *dev, + struct cfg80211_internal_bss *res) +{ + struct rb_node *n = dev->bss_tree.rb_node; + struct cfg80211_internal_bss *bss; + int r; + + while (n) { + bss = rb_entry(n, struct cfg80211_internal_bss, rbn); + r = cmp_bss(&res->pub, &bss->pub); + + if (r == 0) + return bss; + else if (r < 0) + n = n->rb_left; + else + n = n->rb_right; + } + + return NULL; +} + +static struct cfg80211_internal_bss * +cfg80211_bss_update(struct cfg80211_registered_device *dev, + struct cfg80211_internal_bss *res) +{ + struct cfg80211_internal_bss *found = NULL; + + /* + * The reference to "res" is donated to this function. + */ + + if (WARN_ON(!res->pub.channel)) { + kref_put(&res->ref, bss_release); + return NULL; + } + + res->ts = jiffies; + + spin_lock_bh(&dev->bss_lock); + + found = rb_find_bss(dev, res); + + if (found) { + found->pub.beacon_interval = res->pub.beacon_interval; + found->pub.tsf = res->pub.tsf; + found->pub.signal = res->pub.signal; + found->pub.capability = res->pub.capability; + found->ts = res->ts; + + /* Update IEs */ + if (res->pub.proberesp_ies) { + size_t used = dev->wiphy.bss_priv_size + sizeof(*res); + size_t ielen = res->pub.len_proberesp_ies; + + if (found->pub.proberesp_ies && + !found->proberesp_ies_allocated && + ksize(found) >= used + ielen) { + memcpy(found->pub.proberesp_ies, + res->pub.proberesp_ies, ielen); + found->pub.len_proberesp_ies = ielen; + } else { + u8 *ies = found->pub.proberesp_ies; + + if (found->proberesp_ies_allocated) + ies = krealloc(ies, ielen, GFP_ATOMIC); + else + ies = kmalloc(ielen, GFP_ATOMIC); + + if (ies) { + memcpy(ies, res->pub.proberesp_ies, + ielen); + found->proberesp_ies_allocated = true; + found->pub.proberesp_ies = ies; + found->pub.len_proberesp_ies = ielen; + } + } + + /* Override possible earlier Beacon frame IEs */ + found->pub.information_elements = + found->pub.proberesp_ies; + found->pub.len_information_elements = + found->pub.len_proberesp_ies; + } + if (res->pub.beacon_ies) { + size_t used = dev->wiphy.bss_priv_size + sizeof(*res); + size_t ielen = res->pub.len_beacon_ies; + bool information_elements_is_beacon_ies = + (found->pub.information_elements == + found->pub.beacon_ies); + + if (found->pub.beacon_ies && + !found->beacon_ies_allocated && + ksize(found) >= used + ielen) { + memcpy(found->pub.beacon_ies, + res->pub.beacon_ies, ielen); + found->pub.len_beacon_ies = ielen; + } else { + u8 *ies = found->pub.beacon_ies; + + if (found->beacon_ies_allocated) + ies = krealloc(ies, ielen, GFP_ATOMIC); + else + ies = kmalloc(ielen, GFP_ATOMIC); + + if (ies) { + memcpy(ies, res->pub.beacon_ies, + ielen); + found->beacon_ies_allocated = true; + found->pub.beacon_ies = ies; + found->pub.len_beacon_ies = ielen; + } + } + + /* Override IEs if they were from a beacon before */ + if (information_elements_is_beacon_ies) { + found->pub.information_elements = + found->pub.beacon_ies; + found->pub.len_information_elements = + found->pub.len_beacon_ies; + } + } + + kref_put(&res->ref, bss_release); + } else { + /* this "consumes" the reference */ + list_add_tail(&res->list, &dev->bss_list); + rb_insert_bss(dev, res); + found = res; + } + + dev->bss_generation++; + spin_unlock_bh(&dev->bss_lock); + + kref_get(&found->ref); + return found; +} + +struct cfg80211_bss* +cfg80211_inform_bss(struct wiphy *wiphy, + struct ieee80211_channel *channel, + const u8 *bssid, + u64 timestamp, u16 capability, u16 beacon_interval, + const u8 *ie, size_t ielen, + s32 signal, gfp_t gfp) +{ + struct cfg80211_internal_bss *res; + size_t privsz; + + if (WARN_ON(!wiphy)) + return NULL; + + privsz = wiphy->bss_priv_size; + + if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && + (signal < 0 || signal > 100))) + return NULL; + + res = kzalloc(sizeof(*res) + privsz + ielen, gfp); + if (!res) + return NULL; + + memcpy(res->pub.bssid, bssid, ETH_ALEN); + res->pub.channel = channel; + res->pub.signal = signal; + res->pub.tsf = timestamp; + res->pub.beacon_interval = beacon_interval; + res->pub.capability = capability; + /* + * Since we do not know here whether the IEs are from a Beacon or Probe + * Response frame, we need to pick one of the options and only use it + * with the driver that does not provide the full Beacon/Probe Response + * frame. Use Beacon frame pointer to avoid indicating that this should + * override the information_elements pointer should we have received an + * earlier indication of Probe Response data. + * + * The initial buffer for the IEs is allocated with the BSS entry and + * is located after the private area. + */ + res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; + memcpy(res->pub.beacon_ies, ie, ielen); + res->pub.len_beacon_ies = ielen; + res->pub.information_elements = res->pub.beacon_ies; + res->pub.len_information_elements = res->pub.len_beacon_ies; + + kref_init(&res->ref); + + res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); + if (!res) + return NULL; + + if (res->pub.capability & WLAN_CAPABILITY_ESS) + regulatory_hint_found_beacon(wiphy, channel, gfp); + + /* cfg80211_bss_update gives us a referenced result */ + return &res->pub; +} +EXPORT_SYMBOL(cfg80211_inform_bss); + +struct cfg80211_bss * +cfg80211_inform_bss_frame(struct wiphy *wiphy, + struct ieee80211_channel *channel, + struct ieee80211_mgmt *mgmt, size_t len, + s32 signal, gfp_t gfp) +{ + struct cfg80211_internal_bss *res; + size_t ielen = len - offsetof(struct ieee80211_mgmt, + u.probe_resp.variable); + size_t privsz; + + if (WARN_ON(!mgmt)) + return NULL; + + if (WARN_ON(!wiphy)) + return NULL; + + if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && + (signal < 0 || signal > 100))) + return NULL; + + if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) + return NULL; + + privsz = wiphy->bss_priv_size; + + res = kzalloc(sizeof(*res) + privsz + ielen, gfp); + if (!res) + return NULL; + + memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); + res->pub.channel = channel; + res->pub.signal = signal; + res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); + res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); + res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); + /* + * The initial buffer for the IEs is allocated with the BSS entry and + * is located after the private area. + */ + if (ieee80211_is_probe_resp(mgmt->frame_control)) { + res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; + memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, + ielen); + res->pub.len_proberesp_ies = ielen; + res->pub.information_elements = res->pub.proberesp_ies; + res->pub.len_information_elements = res->pub.len_proberesp_ies; + } else { + res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; + memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); + res->pub.len_beacon_ies = ielen; + res->pub.information_elements = res->pub.beacon_ies; + res->pub.len_information_elements = res->pub.len_beacon_ies; + } + + kref_init(&res->ref); + + res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); + if (!res) + return NULL; + + if (res->pub.capability & WLAN_CAPABILITY_ESS) + regulatory_hint_found_beacon(wiphy, channel, gfp); + + /* cfg80211_bss_update gives us a referenced result */ + return &res->pub; +} +EXPORT_SYMBOL(cfg80211_inform_bss_frame); + +void cfg80211_put_bss(struct cfg80211_bss *pub) +{ + struct cfg80211_internal_bss *bss; + + if (!pub) + return; + + bss = container_of(pub, struct cfg80211_internal_bss, pub); + kref_put(&bss->ref, bss_release); +} +EXPORT_SYMBOL(cfg80211_put_bss); + +void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) +{ + struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); + struct cfg80211_internal_bss *bss; + + if (WARN_ON(!pub)) + return; + + bss = container_of(pub, struct cfg80211_internal_bss, pub); + + spin_lock_bh(&dev->bss_lock); + if (!list_empty(&bss->list)) { + __cfg80211_unlink_bss(dev, bss); + dev->bss_generation++; + } + spin_unlock_bh(&dev->bss_lock); +} +EXPORT_SYMBOL(cfg80211_unlink_bss); + +#ifdef CONFIG_CFG80211_WEXT +int cfg80211_wext_siwscan(struct net_device *dev, + struct iw_request_info *info, + union iwreq_data *wrqu, char *extra) +{ + struct cfg80211_registered_device *rdev; + struct wiphy *wiphy; + struct iw_scan_req *wreq = NULL; + struct cfg80211_scan_request *creq = NULL; + int i, err, n_channels = 0; + enum ieee80211_band band; + + if (!netif_running(dev)) + return -ENETDOWN; + + if (wrqu->data.length == sizeof(struct iw_scan_req)) + wreq = (struct iw_scan_req *)extra; + + rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); + + if (IS_ERR(rdev)) + return PTR_ERR(rdev); + + if (rdev->scan_req) { + err = -EBUSY; + goto out; + } + + wiphy = &rdev->wiphy; + + /* Determine number of channels, needed to allocate creq */ + if (wreq && wreq->num_channels) + n_channels = wreq->num_channels; + else { + for (band = 0; band < IEEE80211_NUM_BANDS; band++) + if (wiphy->bands[band]) + n_channels += wiphy->bands[band]->n_channels; + } + + creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + + n_channels * sizeof(void *), + GFP_ATOMIC); + if (!creq) { + err = -ENOMEM; + goto out; + } + + creq->wiphy = wiphy; + creq->dev = dev; + /* SSIDs come after channels */ + creq->ssids = (void *)&creq->channels[n_channels]; + creq->n_channels = n_channels; + creq->n_ssids = 1; + + /* translate "Scan on frequencies" request */ + i = 0; + for (band = 0; band < IEEE80211_NUM_BANDS; band++) { + int j; + + if (!wiphy->bands[band]) + continue; + + for (j = 0; j < wiphy->bands[band]->n_channels; j++) { + /* ignore disabled channels */ + if (wiphy->bands[band]->channels[j].flags & + IEEE80211_CHAN_DISABLED) + continue; + + /* If we have a wireless request structure and the + * wireless request specifies frequencies, then search + * for the matching hardware channel. + */ + if (wreq && wreq->num_channels) { + int k; + int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; + for (k = 0; k < wreq->num_channels; k++) { + int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); + if (wext_freq == wiphy_freq) + goto wext_freq_found; + } + goto wext_freq_not_found; + } + + wext_freq_found: + creq->channels[i] = &wiphy->bands[band]->channels[j]; + i++; + wext_freq_not_found: ; + } + } + /* No channels found? */ + if (!i) { + err = -EINVAL; + goto out; + } + + /* Set real number of channels specified in creq->channels[] */ + creq->n_channels = i; + + /* translate "Scan for SSID" request */ + if (wreq) { + if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { + if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { + err = -EINVAL; + goto out; + } + memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); + creq->ssids[0].ssid_len = wreq->essid_len; + } + if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) + creq->n_ssids = 0; + } + + rdev->scan_req = creq; + err = rdev->ops->scan(wiphy, dev, creq); + if (err) { + rdev->scan_req = NULL; + /* creq will be freed below */ + } else { + nl80211_send_scan_start(rdev, dev); + /* creq now owned by driver */ + creq = NULL; + dev_hold(dev); + } + out: + kfree(creq); + cfg80211_unlock_rdev(rdev); + return err; +} +EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); + +static void ieee80211_scan_add_ies(struct iw_request_info *info, + struct cfg80211_bss *bss, + char **current_ev, char *end_buf) +{ + u8 *pos, *end, *next; + struct iw_event iwe; + + if (!bss->information_elements || + !bss->len_information_elements) + return; + + /* + * If needed, fragment the IEs buffer (at IE boundaries) into short + * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. + */ + pos = bss->information_elements; + end = pos + bss->len_information_elements; + + while (end - pos > IW_GENERIC_IE_MAX) { + next = pos + 2 + pos[1]; + while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) + next = next + 2 + next[1]; + + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVGENIE; + iwe.u.data.length = next - pos; + *current_ev = iwe_stream_add_point(info, *current_ev, + end_buf, &iwe, pos); + + pos = next; + } + + if (end > pos) { + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVGENIE; + iwe.u.data.length = end - pos; + *current_ev = iwe_stream_add_point(info, *current_ev, + end_buf, &iwe, pos); + } +} + +static inline unsigned int elapsed_jiffies_msecs(unsigned long start) +{ + unsigned long end = jiffies; + + if (end >= start) + return jiffies_to_msecs(end - start); + + return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); +} + +static char * +ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, + struct cfg80211_internal_bss *bss, char *current_ev, + char *end_buf) +{ + struct iw_event iwe; + u8 *buf, *cfg, *p; + u8 *ie = bss->pub.information_elements; + int rem = bss->pub.len_information_elements, i, sig; + bool ismesh = false; + + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWAP; + iwe.u.ap_addr.sa_family = ARPHRD_ETHER; + memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); + current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, + IW_EV_ADDR_LEN); + + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWFREQ; + iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); + iwe.u.freq.e = 0; + current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, + IW_EV_FREQ_LEN); + + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWFREQ; + iwe.u.freq.m = bss->pub.channel->center_freq; + iwe.u.freq.e = 6; + current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, + IW_EV_FREQ_LEN); + + if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVQUAL; + iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | + IW_QUAL_NOISE_INVALID | + IW_QUAL_QUAL_UPDATED; + switch (wiphy->signal_type) { + case CFG80211_SIGNAL_TYPE_MBM: + sig = bss->pub.signal / 100; + iwe.u.qual.level = sig; + iwe.u.qual.updated |= IW_QUAL_DBM; + if (sig < -110) /* rather bad */ + sig = -110; + else if (sig > -40) /* perfect */ + sig = -40; + /* will give a range of 0 .. 70 */ + iwe.u.qual.qual = sig + 110; + break; + case CFG80211_SIGNAL_TYPE_UNSPEC: + iwe.u.qual.level = bss->pub.signal; + /* will give range 0 .. 100 */ + iwe.u.qual.qual = bss->pub.signal; + break; + default: + /* not reached */ + break; + } + current_ev = iwe_stream_add_event(info, current_ev, end_buf, + &iwe, IW_EV_QUAL_LEN); + } + + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWENCODE; + if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) + iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; + else + iwe.u.data.flags = IW_ENCODE_DISABLED; + iwe.u.data.length = 0; + current_ev = iwe_stream_add_point(info, current_ev, end_buf, + &iwe, ""); + + while (rem >= 2) { + /* invalid data */ + if (ie[1] > rem - 2) + break; + + switch (ie[0]) { + case WLAN_EID_SSID: + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWESSID; + iwe.u.data.length = ie[1]; + iwe.u.data.flags = 1; + current_ev = iwe_stream_add_point(info, current_ev, end_buf, + &iwe, ie + 2); + break; + case WLAN_EID_MESH_ID: + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWESSID; + iwe.u.data.length = ie[1]; + iwe.u.data.flags = 1; + current_ev = iwe_stream_add_point(info, current_ev, end_buf, + &iwe, ie + 2); + break; + case WLAN_EID_MESH_CONFIG: + ismesh = true; + if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) + break; + buf = kmalloc(50, GFP_ATOMIC); + if (!buf) + break; + cfg = ie + 2; + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVCUSTOM; + sprintf(buf, "Mesh Network Path Selection Protocol ID: " + "0x%02X", cfg[0]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + sprintf(buf, "Path Selection Metric ID: 0x%02X", + cfg[1]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + sprintf(buf, "Congestion Control Mode ID: 0x%02X", + cfg[2]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + sprintf(buf, "Formation Info: 0x%02X", cfg[5]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + sprintf(buf, "Capabilities: 0x%02X", cfg[6]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + kfree(buf); + break; + case WLAN_EID_SUPP_RATES: + case WLAN_EID_EXT_SUPP_RATES: + /* display all supported rates in readable format */ + p = current_ev + iwe_stream_lcp_len(info); + + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWRATE; + /* Those two flags are ignored... */ + iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; + + for (i = 0; i < ie[1]; i++) { + iwe.u.bitrate.value = + ((ie[i + 2] & 0x7f) * 500000); + p = iwe_stream_add_value(info, current_ev, p, + end_buf, &iwe, IW_EV_PARAM_LEN); + } + current_ev = p; + break; + } + rem -= ie[1] + 2; + ie += ie[1] + 2; + } + + if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || + ismesh) { + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWMODE; + if (ismesh) + iwe.u.mode = IW_MODE_MESH; + else if (bss->pub.capability & WLAN_CAPABILITY_ESS) + iwe.u.mode = IW_MODE_MASTER; + else + iwe.u.mode = IW_MODE_ADHOC; + current_ev = iwe_stream_add_event(info, current_ev, end_buf, + &iwe, IW_EV_UINT_LEN); + } + + buf = kmalloc(30, GFP_ATOMIC); + if (buf) { + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVCUSTOM; + sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, end_buf, + &iwe, buf); + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVCUSTOM; + sprintf(buf, " Last beacon: %ums ago", + elapsed_jiffies_msecs(bss->ts)); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, &iwe, buf); + kfree(buf); + } + + ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); + + return current_ev; +} + + +static int ieee80211_scan_results(struct cfg80211_registered_device *dev, + struct iw_request_info *info, + char *buf, size_t len) +{ + char *current_ev = buf; + char *end_buf = buf + len; + struct cfg80211_internal_bss *bss; + + spin_lock_bh(&dev->bss_lock); + cfg80211_bss_expire(dev); + + list_for_each_entry(bss, &dev->bss_list, list) { + if (buf + len - current_ev <= IW_EV_ADDR_LEN) { + spin_unlock_bh(&dev->bss_lock); + return -E2BIG; + } + current_ev = ieee80211_bss(&dev->wiphy, info, bss, + current_ev, end_buf); + } + spin_unlock_bh(&dev->bss_lock); + return current_ev - buf; +} + + +int cfg80211_wext_giwscan(struct net_device *dev, + struct iw_request_info *info, + struct iw_point *data, char *extra) +{ + struct cfg80211_registered_device *rdev; + int res; + + if (!netif_running(dev)) + return -ENETDOWN; + + rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); + + if (IS_ERR(rdev)) + return PTR_ERR(rdev); + + if (rdev->scan_req) { + res = -EAGAIN; + goto out; + } + + res = ieee80211_scan_results(rdev, info, extra, data->length); + data->length = 0; + if (res >= 0) { + data->length = res; + res = 0; + } + + out: + cfg80211_unlock_rdev(rdev); + return res; +} +EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); +#endif |