/* * cfg80211 scan result handling * * Copyright 2008 Johannes Berg */ #include #include #include #include #include #include #include #include #include #include #include #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) { struct net_device *dev; lockdep_assert_held(&rdev->sched_scan_mtx); if (!rdev->sched_scan_req) return -ENOENT; dev = rdev->sched_scan_req->dev; if (!driver_initiated) { int 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 0; } 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); const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, const u8 *ies, int len) { struct ieee80211_vendor_ie *ie; const u8 *pos = ies, *end = ies + len; int ie_oui; while (pos < end) { pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, end - pos); if (!pos) return NULL; if (end - pos < sizeof(*ie)) return NULL; ie = (struct ieee80211_vendor_ie *)pos; ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; if (ie_oui == oui && ie->oui_type == oui_type) return pos; pos += 2 + ie->len; } return NULL; } EXPORT_SYMBOL(cfg80211_find_vendor_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); /* equal if both missing */ if (!ie1 && !ie2) return 0; /* sort missing IE before (left of) present IE */ if (!ie1) return -1; if (!ie2) return 1; /* sort by length first, then by contents */ if (ie1[1] != ie2[1]) return ie2[1] - ie1[1]; return memcmp(ie1 + 2, ie2 + 2, ie1[1]); } 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_core(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); } return memcmp(a->bssid, b->bssid, ETH_ALEN); } static int cmp_bss(struct cfg80211_bss *a, struct cfg80211_bss *b) { int r; r = cmp_bss_core(a, b); if (r) return r; return cmp_ies(WLAN_EID_SSID, a->information_elements, a->len_information_elements, b->information_elements, b->len_information_elements); } static int cmp_hidden_bss(struct cfg80211_bss *a, struct cfg80211_bss *b) { const u8 *ie1; const u8 *ie2; int i; int r; r = cmp_bss_core(a, b); if (r) return r; ie1 = cfg80211_find_ie(WLAN_EID_SSID, a->information_elements, a->len_information_elements); ie2 = cfg80211_find_ie(WLAN_EID_SSID, b->information_elements, b->len_information_elements); /* Key comparator must use same algorithm in any rb-tree * search function (order is important), otherwise ordering * of items in the tree is broken and search gives incorrect * results. This code uses same order as cmp_ies() does. */ /* sort missing IE before (left of) present IE */ if (!ie1) return -1; if (!ie2) return 1; /* zero-size SSID is used as an indication of the hidden bss */ if (!ie2[1]) return 0; /* sort by length first, then by contents */ if (ie1[1] != ie2[1]) return ie2[1] - ie1[1]; /* zeroed SSID ie is another indication of a hidden bss */ for (i = 0; i < ie2[1]; i++) if (ie2[i + 2]) return -1; return 0; } 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 * rb_find_hidden_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_hidden_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 void copy_hidden_ies(struct cfg80211_internal_bss *res, struct cfg80211_internal_bss *hidden) { if (unlikely(res->pub.beacon_ies)) return; if (WARN_ON(!hidden->pub.beacon_ies)) return; res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC); if (unlikely(!res->pub.beacon_ies)) return; res->beacon_ies_allocated = true; res->pub.len_beacon_ies = hidden->pub.len_beacon_ies; memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies, res->pub.len_beacon_ies); } 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 { struct cfg80211_internal_bss *hidden; /* First check if the beacon is a probe response from * a hidden bss. If so, copy beacon ies (with nullified * ssid) into the probe response bss entry (with real ssid). * It is required basically for PSM implementation * (probe responses do not contain tim ie) */ /* TODO: The code is not trying to update existing probe * response bss entries when beacon ies are * getting changed. */ hidden = rb_find_hidden_bss(dev, res); if (hidden) copy_hidden_ies(res, hidden); /* 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 tsf, 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 = tsf; 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_ref_bss(struct cfg80211_bss *pub) { struct cfg80211_internal_bss *bss; if (!pub) return; bss = container_of(pub, struct cfg80211_internal_bss, pub); kref_get(&bss->ref); } EXPORT_SYMBOL(cfg80211_ref_bss); 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; } for (i = 0; i < IEEE80211_NUM_BANDS; i++) creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; for (i = 0; i < IEEE80211_NUM_BANDS; i++) if (wiphy->bands[i]) creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 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