/* * BSS client mode implementation * Copyright 2003, Jouni Malinen * Copyright 2004, Instant802 Networks, Inc. * Copyright 2005, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc * Copyright 2007, Michael Wu * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include "ieee80211_i.h" #include "rate.h" #include "led.h" #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) #define IEEE80211_AUTH_MAX_TRIES 3 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) #define IEEE80211_ASSOC_MAX_TRIES 3 #define IEEE80211_MONITORING_INTERVAL (2 * HZ) #define IEEE80211_PROBE_INTERVAL (60 * HZ) #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ) #define IEEE80211_SCAN_INTERVAL (2 * HZ) #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 /* utils */ static int ecw2cw(int ecw) { return (1 << ecw) - 1; } static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie) { u8 *end, *pos; pos = bss->ies; if (pos == NULL) return NULL; end = pos + bss->ies_len; while (pos + 1 < end) { if (pos + 2 + pos[1] > end) break; if (pos[0] == ie) return pos; pos += 2 + pos[1]; } return NULL; } static int ieee80211_compatible_rates(struct ieee80211_bss *bss, struct ieee80211_supported_band *sband, u64 *rates) { int i, j, count; *rates = 0; count = 0; for (i = 0; i < bss->supp_rates_len; i++) { int rate = (bss->supp_rates[i] & 0x7F) * 5; for (j = 0; j < sband->n_bitrates; j++) if (sband->bitrates[j].bitrate == rate) { *rates |= BIT(j); count++; break; } } return count; } /* also used by mesh code */ u64 ieee80211_sta_get_rates(struct ieee80211_local *local, struct ieee802_11_elems *elems, enum ieee80211_band band) { struct ieee80211_supported_band *sband; struct ieee80211_rate *bitrates; size_t num_rates; u64 supp_rates; int i, j; sband = local->hw.wiphy->bands[band]; if (!sband) { WARN_ON(1); sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; } bitrates = sband->bitrates; num_rates = sband->n_bitrates; supp_rates = 0; for (i = 0; i < elems->supp_rates_len + elems->ext_supp_rates_len; i++) { u8 rate = 0; int own_rate; if (i < elems->supp_rates_len) rate = elems->supp_rates[i]; else if (elems->ext_supp_rates) rate = elems->ext_supp_rates [i - elems->supp_rates_len]; own_rate = 5 * (rate & 0x7f); for (j = 0; j < num_rates; j++) if (bitrates[j].bitrate == own_rate) supp_rates |= BIT(j); } return supp_rates; } /* frame sending functions */ /* also used by scanning code */ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, u8 *ssid, size_t ssid_len) { struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u8 *pos, *supp_rates, *esupp_rates = NULL; int i; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for probe " "request\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_REQ); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); if (dst) { memcpy(mgmt->da, dst, ETH_ALEN); memcpy(mgmt->bssid, dst, ETH_ALEN); } else { memset(mgmt->da, 0xff, ETH_ALEN); memset(mgmt->bssid, 0xff, ETH_ALEN); } pos = skb_put(skb, 2 + ssid_len); *pos++ = WLAN_EID_SSID; *pos++ = ssid_len; memcpy(pos, ssid, ssid_len); supp_rates = skb_put(skb, 2); supp_rates[0] = WLAN_EID_SUPP_RATES; supp_rates[1] = 0; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; for (i = 0; i < sband->n_bitrates; i++) { struct ieee80211_rate *rate = &sband->bitrates[i]; if (esupp_rates) { pos = skb_put(skb, 1); esupp_rates[1]++; } else if (supp_rates[1] == 8) { esupp_rates = skb_put(skb, 3); esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES; esupp_rates[1] = 1; pos = &esupp_rates[2]; } else { pos = skb_put(skb, 1); supp_rates[1]++; } *pos = rate->bitrate / 5; } ieee80211_tx_skb(sdata, skb, 0); } static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, int transaction, u8 *extra, size_t extra_len, int encrypt) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 6 + extra_len); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for auth " "frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6); memset(mgmt, 0, 24 + 6); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_AUTH); if (encrypt) mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); memcpy(mgmt->da, ifsta->bssid, ETH_ALEN); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg); mgmt->u.auth.auth_transaction = cpu_to_le16(transaction); ifsta->auth_transaction = transaction + 1; mgmt->u.auth.status_code = cpu_to_le16(0); if (extra) memcpy(skb_put(skb, extra_len), extra, extra_len); ieee80211_tx_skb(sdata, skb, encrypt); } static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u8 *pos, *ies, *ht_ie; int i, len, count, rates_len, supp_rates_len; u16 capab; struct ieee80211_bss *bss; int wmm = 0; struct ieee80211_supported_band *sband; u64 rates = 0; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 + ifsta->extra_ie_len + ifsta->ssid_len); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for assoc " "frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; capab = ifsta->capab; if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) { if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; } bss = ieee80211_rx_bss_get(local, ifsta->bssid, local->hw.conf.channel->center_freq, ifsta->ssid, ifsta->ssid_len); if (bss) { if (bss->capability & WLAN_CAPABILITY_PRIVACY) capab |= WLAN_CAPABILITY_PRIVACY; if (bss->wmm_used) wmm = 1; /* get all rates supported by the device and the AP as * some APs don't like getting a superset of their rates * in the association request (e.g. D-Link DAP 1353 in * b-only mode) */ rates_len = ieee80211_compatible_rates(bss, sband, &rates); if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; ieee80211_rx_bss_put(local, bss); } else { rates = ~0; rates_len = sband->n_bitrates; } mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); memcpy(mgmt->da, ifsta->bssid, ETH_ALEN); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) { skb_put(skb, 10); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_REASSOC_REQ); mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); mgmt->u.reassoc_req.listen_interval = cpu_to_le16(local->hw.conf.listen_interval); memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid, ETH_ALEN); } else { skb_put(skb, 4); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ASSOC_REQ); mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); mgmt->u.assoc_req.listen_interval = cpu_to_le16(local->hw.conf.listen_interval); } /* SSID */ ies = pos = skb_put(skb, 2 + ifsta->ssid_len); *pos++ = WLAN_EID_SSID; *pos++ = ifsta->ssid_len; memcpy(pos, ifsta->ssid, ifsta->ssid_len); /* add all rates which were marked to be used above */ supp_rates_len = rates_len; if (supp_rates_len > 8) supp_rates_len = 8; len = sband->n_bitrates; pos = skb_put(skb, supp_rates_len + 2); *pos++ = WLAN_EID_SUPP_RATES; *pos++ = supp_rates_len; count = 0; for (i = 0; i < sband->n_bitrates; i++) { if (BIT(i) & rates) { int rate = sband->bitrates[i].bitrate; *pos++ = (u8) (rate / 5); if (++count == 8) break; } } if (rates_len > count) { pos = skb_put(skb, rates_len - count + 2); *pos++ = WLAN_EID_EXT_SUPP_RATES; *pos++ = rates_len - count; for (i++; i < sband->n_bitrates; i++) { if (BIT(i) & rates) { int rate = sband->bitrates[i].bitrate; *pos++ = (u8) (rate / 5); } } } if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { /* 1. power capabilities */ pos = skb_put(skb, 4); *pos++ = WLAN_EID_PWR_CAPABILITY; *pos++ = 2; *pos++ = 0; /* min tx power */ *pos++ = local->hw.conf.channel->max_power; /* max tx power */ /* 2. supported channels */ /* TODO: get this in reg domain format */ pos = skb_put(skb, 2 * sband->n_channels + 2); *pos++ = WLAN_EID_SUPPORTED_CHANNELS; *pos++ = 2 * sband->n_channels; for (i = 0; i < sband->n_channels; i++) { *pos++ = ieee80211_frequency_to_channel( sband->channels[i].center_freq); *pos++ = 1; /* one channel in the subband*/ } } if (ifsta->extra_ie) { pos = skb_put(skb, ifsta->extra_ie_len); memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len); } if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) { pos = skb_put(skb, 9); *pos++ = WLAN_EID_VENDOR_SPECIFIC; *pos++ = 7; /* len */ *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ *pos++ = 0x50; *pos++ = 0xf2; *pos++ = 2; /* WME */ *pos++ = 0; /* WME info */ *pos++ = 1; /* WME ver */ *pos++ = 0; } /* wmm support is a must to HT */ if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) && sband->ht_cap.ht_supported && (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) && ht_ie[1] >= sizeof(struct ieee80211_ht_info)) { struct ieee80211_ht_info *ht_info = (struct ieee80211_ht_info *)(ht_ie + 2); u16 cap = sband->ht_cap.cap; __le16 tmp; u32 flags = local->hw.conf.channel->flags; switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) { cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; cap &= ~IEEE80211_HT_CAP_SGI_40; } break; case IEEE80211_HT_PARAM_CHA_SEC_BELOW: if (flags & IEEE80211_CHAN_NO_FAT_BELOW) { cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; cap &= ~IEEE80211_HT_CAP_SGI_40; } break; } tmp = cpu_to_le16(cap); pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2); *pos++ = WLAN_EID_HT_CAPABILITY; *pos++ = sizeof(struct ieee80211_ht_cap); memset(pos, 0, sizeof(struct ieee80211_ht_cap)); memcpy(pos, &tmp, sizeof(u16)); pos += sizeof(u16); /* TODO: needs a define here for << 2 */ *pos++ = sband->ht_cap.ampdu_factor | (sband->ht_cap.ampdu_density << 2); memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs)); } kfree(ifsta->assocreq_ies); ifsta->assocreq_ies_len = (skb->data + skb->len) - ies; ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL); if (ifsta->assocreq_ies) memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len); ieee80211_tx_skb(sdata, skb, 0); } static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, u16 stype, u16 reason) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_sta *ifsta = &sdata->u.sta; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for " "deauth/disassoc frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); memcpy(mgmt->da, ifsta->bssid, ETH_ALEN); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); skb_put(skb, 2); /* u.deauth.reason_code == u.disassoc.reason_code */ mgmt->u.deauth.reason_code = cpu_to_le16(reason); ieee80211_tx_skb(sdata, skb, 0); } /* MLME */ static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata, struct ieee80211_bss *bss) { struct ieee80211_local *local = sdata->local; int i, have_higher_than_11mbit = 0; /* cf. IEEE 802.11 9.2.12 */ for (i = 0; i < bss->supp_rates_len; i++) if ((bss->supp_rates[i] & 0x7f) * 5 > 110) have_higher_than_11mbit = 1; if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; else sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; ieee80211_set_wmm_default(sdata); } static void ieee80211_sta_wmm_params(struct ieee80211_local *local, struct ieee80211_if_sta *ifsta, u8 *wmm_param, size_t wmm_param_len) { struct ieee80211_tx_queue_params params; size_t left; int count; u8 *pos; if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED)) return; if (!wmm_param) return; if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) return; count = wmm_param[6] & 0x0f; if (count == ifsta->wmm_last_param_set) return; ifsta->wmm_last_param_set = count; pos = wmm_param + 8; left = wmm_param_len - 8; memset(¶ms, 0, sizeof(params)); if (!local->ops->conf_tx) return; local->wmm_acm = 0; for (; left >= 4; left -= 4, pos += 4) { int aci = (pos[0] >> 5) & 0x03; int acm = (pos[0] >> 4) & 0x01; int queue; switch (aci) { case 1: queue = 3; if (acm) local->wmm_acm |= BIT(0) | BIT(3); break; case 2: queue = 1; if (acm) local->wmm_acm |= BIT(4) | BIT(5); break; case 3: queue = 0; if (acm) local->wmm_acm |= BIT(6) | BIT(7); break; case 0: default: queue = 2; if (acm) local->wmm_acm |= BIT(1) | BIT(2); break; } params.aifs = pos[0] & 0x0f; params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); params.cw_min = ecw2cw(pos[1] & 0x0f); params.txop = get_unaligned_le16(pos + 2); #ifdef CONFIG_MAC80211_VERBOSE_DEBUG printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d " "cWmin=%d cWmax=%d txop=%d\n", local->mdev->name, queue, aci, acm, params.aifs, params.cw_min, params.cw_max, params.txop); #endif /* TODO: handle ACM (block TX, fallback to next lowest allowed * AC for now) */ if (local->ops->conf_tx(local_to_hw(local), queue, ¶ms)) { printk(KERN_DEBUG "%s: failed to set TX queue " "parameters for queue %d\n", local->mdev->name, queue); } } } static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, u16 capab, bool erp_valid, u8 erp) { struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; #ifdef CONFIG_MAC80211_VERBOSE_DEBUG struct ieee80211_if_sta *ifsta = &sdata->u.sta; #endif u32 changed = 0; bool use_protection; bool use_short_preamble; bool use_short_slot; if (erp_valid) { use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; } else { use_protection = false; use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); } use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); if (use_protection != bss_conf->use_cts_prot) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n", sdata->dev->name, use_protection ? "enabled" : "disabled", ifsta->bssid); } #endif bss_conf->use_cts_prot = use_protection; changed |= BSS_CHANGED_ERP_CTS_PROT; } if (use_short_preamble != bss_conf->use_short_preamble) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: switched to %s barker preamble" " (BSSID=%pM)\n", sdata->dev->name, use_short_preamble ? "short" : "long", ifsta->bssid); } #endif bss_conf->use_short_preamble = use_short_preamble; changed |= BSS_CHANGED_ERP_PREAMBLE; } if (use_short_slot != bss_conf->use_short_slot) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: switched to %s slot" " (BSSID=%s)\n", sdata->dev->name, use_short_slot ? "short" : "long", ifsta->bssid); } #endif bss_conf->use_short_slot = use_short_slot; changed |= BSS_CHANGED_ERP_SLOT; } return changed; } static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { union iwreq_data wrqu; memset(&wrqu, 0, sizeof(wrqu)); if (ifsta->flags & IEEE80211_STA_ASSOCIATED) memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN); wrqu.ap_addr.sa_family = ARPHRD_ETHER; wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL); } static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { char *buf; size_t len; int i; union iwreq_data wrqu; if (!ifsta->assocreq_ies && !ifsta->assocresp_ies) return; buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len + ifsta->assocresp_ies_len), GFP_KERNEL); if (!buf) return; len = sprintf(buf, "ASSOCINFO("); if (ifsta->assocreq_ies) { len += sprintf(buf + len, "ReqIEs="); for (i = 0; i < ifsta->assocreq_ies_len; i++) { len += sprintf(buf + len, "%02x", ifsta->assocreq_ies[i]); } } if (ifsta->assocresp_ies) { if (ifsta->assocreq_ies) len += sprintf(buf + len, " "); len += sprintf(buf + len, "RespIEs="); for (i = 0; i < ifsta->assocresp_ies_len; i++) { len += sprintf(buf + len, "%02x", ifsta->assocresp_ies[i]); } } len += sprintf(buf + len, ")"); if (len > IW_CUSTOM_MAX) { len = sprintf(buf, "ASSOCRESPIE="); for (i = 0; i < ifsta->assocresp_ies_len; i++) { len += sprintf(buf + len, "%02x", ifsta->assocresp_ies[i]); } } if (len <= IW_CUSTOM_MAX) { memset(&wrqu, 0, sizeof(wrqu)); wrqu.data.length = len; wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf); } kfree(buf); } static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, u32 bss_info_changed) { struct ieee80211_local *local = sdata->local; struct ieee80211_conf *conf = &local_to_hw(local)->conf; struct ieee80211_bss *bss; bss_info_changed |= BSS_CHANGED_ASSOC; ifsta->flags |= IEEE80211_STA_ASSOCIATED; if (sdata->vif.type != NL80211_IFTYPE_STATION) return; bss = ieee80211_rx_bss_get(local, ifsta->bssid, conf->channel->center_freq, ifsta->ssid, ifsta->ssid_len); if (bss) { /* set timing information */ sdata->vif.bss_conf.beacon_int = bss->beacon_int; sdata->vif.bss_conf.timestamp = bss->timestamp; sdata->vif.bss_conf.dtim_period = bss->dtim_period; bss_info_changed |= ieee80211_handle_bss_capability(sdata, bss->capability, bss->has_erp_value, bss->erp_value); ieee80211_rx_bss_put(local, bss); } ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET; memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN); ieee80211_sta_send_associnfo(sdata, ifsta); ifsta->last_probe = jiffies; ieee80211_led_assoc(local, 1); sdata->vif.bss_conf.assoc = 1; /* * For now just always ask the driver to update the basic rateset * when we have associated, we aren't checking whether it actually * changed or not. */ bss_info_changed |= BSS_CHANGED_BASIC_RATES; ieee80211_bss_info_change_notify(sdata, bss_info_changed); if (local->powersave) { local->hw.conf.flags |= IEEE80211_CONF_PS; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); } netif_tx_start_all_queues(sdata->dev); netif_carrier_on(sdata->dev); ieee80211_sta_send_apinfo(sdata, ifsta); } static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { ifsta->direct_probe_tries++; if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) { printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n", sdata->dev->name, ifsta->bssid); ifsta->state = IEEE80211_STA_MLME_DISABLED; ieee80211_sta_send_apinfo(sdata, ifsta); return; } printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n", sdata->dev->name, ifsta->bssid, ifsta->direct_probe_tries); ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request); /* Direct probe is sent to broadcast address as some APs * will not answer to direct packet in unassociated state. */ ieee80211_send_probe_req(sdata, NULL, ifsta->ssid, ifsta->ssid_len); mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT); } static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { ifsta->auth_tries++; if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) { printk(KERN_DEBUG "%s: authentication with AP %pM" " timed out\n", sdata->dev->name, ifsta->bssid); ifsta->state = IEEE80211_STA_MLME_DISABLED; ieee80211_sta_send_apinfo(sdata, ifsta); return; } ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; printk(KERN_DEBUG "%s: authenticate with AP %pM\n", sdata->dev->name, ifsta->bssid); ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0); mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT); } /* * The disassoc 'reason' argument can be either our own reason * if self disconnected or a reason code from the AP. */ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, bool deauth, bool self_disconnected, u16 reason) { struct ieee80211_local *local = sdata->local; struct sta_info *sta; u32 changed = 0, config_changed = 0; rcu_read_lock(); sta = sta_info_get(local, ifsta->bssid); if (!sta) { rcu_read_unlock(); return; } if (deauth) { ifsta->direct_probe_tries = 0; ifsta->auth_tries = 0; } ifsta->assoc_scan_tries = 0; ifsta->assoc_tries = 0; netif_tx_stop_all_queues(sdata->dev); netif_carrier_off(sdata->dev); ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr); if (self_disconnected) { if (deauth) ieee80211_send_deauth_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason); else ieee80211_send_deauth_disassoc(sdata, IEEE80211_STYPE_DISASSOC, reason); } ifsta->flags &= ~IEEE80211_STA_ASSOCIATED; changed |= ieee80211_reset_erp_info(sdata); ieee80211_led_assoc(local, 0); changed |= BSS_CHANGED_ASSOC; sdata->vif.bss_conf.assoc = false; ieee80211_sta_send_apinfo(sdata, ifsta); if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) ifsta->state = IEEE80211_STA_MLME_DISABLED; rcu_read_unlock(); local->hw.conf.ht.enabled = false; local->oper_channel_type = NL80211_CHAN_NO_HT; config_changed |= IEEE80211_CONF_CHANGE_HT; if (local->hw.conf.flags & IEEE80211_CONF_PS) { local->hw.conf.flags &= ~IEEE80211_CONF_PS; config_changed |= IEEE80211_CONF_CHANGE_PS; } ieee80211_hw_config(local, config_changed); ieee80211_bss_info_change_notify(sdata, changed); rcu_read_lock(); sta = sta_info_get(local, ifsta->bssid); if (!sta) { rcu_read_unlock(); return; } sta_info_unlink(&sta); rcu_read_unlock(); sta_info_destroy(sta); } static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata) { if (!sdata || !sdata->default_key || sdata->default_key->conf.alg != ALG_WEP) return 0; return 1; } static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { struct ieee80211_local *local = sdata->local; struct ieee80211_bss *bss; int bss_privacy; int wep_privacy; int privacy_invoked; if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL)) return 0; bss = ieee80211_rx_bss_get(local, ifsta->bssid, local->hw.conf.channel->center_freq, ifsta->ssid, ifsta->ssid_len); if (!bss) return 0; bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY); wep_privacy = !!ieee80211_sta_wep_configured(sdata); privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED); ieee80211_rx_bss_put(local, bss); if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked)) return 0; return 1; } static void ieee80211_associate(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { ifsta->assoc_tries++; if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) { printk(KERN_DEBUG "%s: association with AP %pM" " timed out\n", sdata->dev->name, ifsta->bssid); ifsta->state = IEEE80211_STA_MLME_DISABLED; ieee80211_sta_send_apinfo(sdata, ifsta); return; } ifsta->state = IEEE80211_STA_MLME_ASSOCIATE; printk(KERN_DEBUG "%s: associate with AP %pM\n", sdata->dev->name, ifsta->bssid); if (ieee80211_privacy_mismatch(sdata, ifsta)) { printk(KERN_DEBUG "%s: mismatch in privacy configuration and " "mixed-cell disabled - abort association\n", sdata->dev->name); ifsta->state = IEEE80211_STA_MLME_DISABLED; return; } ieee80211_send_assoc(sdata, ifsta); mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT); } static void ieee80211_associated(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { struct ieee80211_local *local = sdata->local; struct sta_info *sta; int disassoc; /* TODO: start monitoring current AP signal quality and number of * missed beacons. Scan other channels every now and then and search * for better APs. */ /* TODO: remove expired BSSes */ ifsta->state = IEEE80211_STA_MLME_ASSOCIATED; rcu_read_lock(); sta = sta_info_get(local, ifsta->bssid); if (!sta) { printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n", sdata->dev->name, ifsta->bssid); disassoc = 1; } else { disassoc = 0; if (time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) { if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) { printk(KERN_DEBUG "%s: No ProbeResp from " "current AP %pM - assume out of " "range\n", sdata->dev->name, ifsta->bssid); disassoc = 1; } else ieee80211_send_probe_req(sdata, ifsta->bssid, ifsta->ssid, ifsta->ssid_len); ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL; } else { ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL; if (time_after(jiffies, ifsta->last_probe + IEEE80211_PROBE_INTERVAL)) { ifsta->last_probe = jiffies; ieee80211_send_probe_req(sdata, ifsta->bssid, ifsta->ssid, ifsta->ssid_len); } } } rcu_read_unlock(); if (disassoc) ieee80211_set_disassoc(sdata, ifsta, true, true, WLAN_REASON_PREV_AUTH_NOT_VALID); else mod_timer(&ifsta->timer, jiffies + IEEE80211_MONITORING_INTERVAL); } static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name); ifsta->flags |= IEEE80211_STA_AUTHENTICATED; ieee80211_associate(sdata, ifsta); } static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, struct ieee80211_mgmt *mgmt, size_t len) { u8 *pos; struct ieee802_11_elems elems; pos = mgmt->u.auth.variable; ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); if (!elems.challenge) return; ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2, elems.challenge_len + 2, 1); } static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, struct ieee80211_mgmt *mgmt, size_t len) { u16 auth_alg, auth_transaction, status_code; if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE && sdata->vif.type != NL80211_IFTYPE_ADHOC) return; if (len < 24 + 6) return; if (sdata->vif.type != NL80211_IFTYPE_ADHOC && memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) return; if (sdata->vif.type != NL80211_IFTYPE_ADHOC && memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) return; auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); status_code = le16_to_cpu(mgmt->u.auth.status_code); if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { /* * IEEE 802.11 standard does not require authentication in IBSS * networks and most implementations do not seem to use it. * However, try to reply to authentication attempts if someone * has actually implemented this. */ if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) return; ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0); } if (auth_alg != ifsta->auth_alg || auth_transaction != ifsta->auth_transaction) return; if (status_code != WLAN_STATUS_SUCCESS) { if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) { u8 algs[3]; const int num_algs = ARRAY_SIZE(algs); int i, pos; algs[0] = algs[1] = algs[2] = 0xff; if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN) algs[0] = WLAN_AUTH_OPEN; if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY) algs[1] = WLAN_AUTH_SHARED_KEY; if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP) algs[2] = WLAN_AUTH_LEAP; if (ifsta->auth_alg == WLAN_AUTH_OPEN) pos = 0; else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY) pos = 1; else pos = 2; for (i = 0; i < num_algs; i++) { pos++; if (pos >= num_algs) pos = 0; if (algs[pos] == ifsta->auth_alg || algs[pos] == 0xff) continue; if (algs[pos] == WLAN_AUTH_SHARED_KEY && !ieee80211_sta_wep_configured(sdata)) continue; ifsta->auth_alg = algs[pos]; break; } } return; } switch (ifsta->auth_alg) { case WLAN_AUTH_OPEN: case WLAN_AUTH_LEAP: ieee80211_auth_completed(sdata, ifsta); break; case WLAN_AUTH_SHARED_KEY: if (ifsta->auth_transaction == 4) ieee80211_auth_completed(sdata, ifsta); else ieee80211_auth_challenge(sdata, ifsta, mgmt, len); break; } } static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, struct ieee80211_mgmt *mgmt, size_t len) { u16 reason_code; if (len < 24 + 2) return; if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN)) return; reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n", sdata->dev->name, reason_code); if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE || ifsta->state == IEEE80211_STA_MLME_ASSOCIATE || ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) { ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; mod_timer(&ifsta->timer, jiffies + IEEE80211_RETRY_AUTH_INTERVAL); } ieee80211_set_disassoc(sdata, ifsta, true, false, 0); ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED; } static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, struct ieee80211_mgmt *mgmt, size_t len) { u16 reason_code; if (len < 24 + 2) return; if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN)) return; reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); if (ifsta->flags & IEEE80211_STA_ASSOCIATED) printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n", sdata->dev->name, reason_code); if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) { ifsta->state = IEEE80211_STA_MLME_ASSOCIATE; mod_timer(&ifsta->timer, jiffies + IEEE80211_RETRY_AUTH_INTERVAL); } ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code); } static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, struct ieee80211_mgmt *mgmt, size_t len, int reassoc) { struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; struct sta_info *sta; u64 rates, basic_rates; u16 capab_info, status_code, aid; struct ieee802_11_elems elems; struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; u8 *pos; u32 changed = 0; int i, j; bool have_higher_than_11mbit = false, newsta = false; u16 ap_ht_cap_flags; /* AssocResp and ReassocResp have identical structure, so process both * of them in this function. */ if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE) return; if (len < 24 + 6) return; if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) return; capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); aid = le16_to_cpu(mgmt->u.assoc_resp.aid); printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x " "status=%d aid=%d)\n", sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa, capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); if (status_code != WLAN_STATUS_SUCCESS) { printk(KERN_DEBUG "%s: AP denied association (code=%d)\n", sdata->dev->name, status_code); /* if this was a reassociation, ensure we try a "full" * association next time. This works around some broken APs * which do not correctly reject reassociation requests. */ ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET; return; } if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " "set\n", sdata->dev->name, aid); aid &= ~(BIT(15) | BIT(14)); pos = mgmt->u.assoc_resp.variable; ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); if (!elems.supp_rates) { printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", sdata->dev->name); return; } printk(KERN_DEBUG "%s: associated\n", sdata->dev->name); ifsta->aid = aid; ifsta->ap_capab = capab_info; kfree(ifsta->assocresp_ies); ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt); ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL); if (ifsta->assocresp_ies) memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len); rcu_read_lock(); /* Add STA entry for the AP */ sta = sta_info_get(local, ifsta->bssid); if (!sta) { struct ieee80211_bss *bss; newsta = true; sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC); if (!sta) { printk(KERN_DEBUG "%s: failed to alloc STA entry for" " the AP\n", sdata->dev->name); rcu_read_unlock(); return; } bss = ieee80211_rx_bss_get(local, ifsta->bssid, local->hw.conf.channel->center_freq, ifsta->ssid, ifsta->ssid_len); if (bss) { sta->last_signal = bss->signal; sta->last_qual = bss->qual; sta->last_noise = bss->noise; ieee80211_rx_bss_put(local, bss); } /* update new sta with its last rx activity */ sta->last_rx = jiffies; } /* * FIXME: Do we really need to update the sta_info's information here? * We already know about the AP (we found it in our list) so it * should already be filled with the right info, no? * As is stands, all this is racy because typically we assume * the information that is filled in here (except flags) doesn't * change while a STA structure is alive. As such, it should move * to between the sta_info_alloc() and sta_info_insert() above. */ set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP | WLAN_STA_AUTHORIZED); rates = 0; basic_rates = 0; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; for (i = 0; i < elems.supp_rates_len; i++) { int rate = (elems.supp_rates[i] & 0x7f) * 5; bool is_basic = !!(elems.supp_rates[i] & 0x80); if (rate > 110) have_higher_than_11mbit = true; for (j = 0; j < sband->n_bitrates; j++) { if (sband->bitrates[j].bitrate == rate) { rates |= BIT(j); if (is_basic) basic_rates |= BIT(j); break; } } } for (i = 0; i < elems.ext_supp_rates_len; i++) { int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; bool is_basic = !!(elems.supp_rates[i] & 0x80); if (rate > 110) have_higher_than_11mbit = true; for (j = 0; j < sband->n_bitrates; j++) { if (sband->bitrates[j].bitrate == rate) { rates |= BIT(j); if (is_basic) basic_rates |= BIT(j); break; } } } sta->sta.supp_rates[local->hw.conf.channel->band] = rates; sdata->vif.bss_conf.basic_rates = basic_rates; /* cf. IEEE 802.11 9.2.12 */ if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; else sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; if (elems.ht_cap_elem) ieee80211_ht_cap_ie_to_sta_ht_cap(sband, elems.ht_cap_elem, &sta->sta.ht_cap); ap_ht_cap_flags = sta->sta.ht_cap.cap; rate_control_rate_init(sta); if (elems.wmm_param) set_sta_flags(sta, WLAN_STA_WME); if (newsta) { int err = sta_info_insert(sta); if (err) { printk(KERN_DEBUG "%s: failed to insert STA entry for" " the AP (error %d)\n", sdata->dev->name, err); rcu_read_unlock(); return; } } rcu_read_unlock(); if (elems.wmm_param) ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param, elems.wmm_param_len); if (elems.ht_info_elem && elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, ap_ht_cap_flags); /* set AID and assoc capability, * ieee80211_set_associated() will tell the driver */ bss_conf->aid = aid; bss_conf->assoc_capability = capab_info; ieee80211_set_associated(sdata, ifsta, changed); ieee80211_associated(sdata, ifsta); } static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, struct ieee80211_bss *bss) { struct ieee80211_local *local = sdata->local; int res, rates, i, j; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u8 *pos; struct ieee80211_supported_band *sband; union iwreq_data wrqu; skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for probe " "response\n", sdata->dev->name); return -ENOMEM; } sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; /* Remove possible STA entries from other IBSS networks. */ sta_info_flush_delayed(sdata); if (local->ops->reset_tsf) { /* Reset own TSF to allow time synchronization work. */ local->ops->reset_tsf(local_to_hw(local)); } memcpy(ifsta->bssid, bss->bssid, ETH_ALEN); res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID); if (res) return res; local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10; sdata->drop_unencrypted = bss->capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; res = ieee80211_set_freq(sdata, bss->freq); if (res) return res; /* Build IBSS probe response */ skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_RESP); memset(mgmt->da, 0xff, ETH_ALEN); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); mgmt->u.beacon.beacon_int = cpu_to_le16(local->hw.conf.beacon_int); mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp); mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability); pos = skb_put(skb, 2 + ifsta->ssid_len); *pos++ = WLAN_EID_SSID; *pos++ = ifsta->ssid_len; memcpy(pos, ifsta->ssid, ifsta->ssid_len); rates = bss->supp_rates_len; if (rates > 8) rates = 8; pos = skb_put(skb, 2 + rates); *pos++ = WLAN_EID_SUPP_RATES; *pos++ = rates; memcpy(pos, bss->supp_rates, rates); if (bss->band == IEEE80211_BAND_2GHZ) { pos = skb_put(skb, 2 + 1); *pos++ = WLAN_EID_DS_PARAMS; *pos++ = 1; *pos++ = ieee80211_frequency_to_channel(bss->freq); } pos = skb_put(skb, 2 + 2); *pos++ = WLAN_EID_IBSS_PARAMS; *pos++ = 2; /* FIX: set ATIM window based on scan results */ *pos++ = 0; *pos++ = 0; if (bss->supp_rates_len > 8) { rates = bss->supp_rates_len - 8; pos = skb_put(skb, 2 + rates); *pos++ = WLAN_EID_EXT_SUPP_RATES; *pos++ = rates; memcpy(pos, &bss->supp_rates[8], rates); } ifsta->probe_resp = skb; ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON); rates = 0; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; for (i = 0; i < bss->supp_rates_len; i++) { int bitrate = (bss->supp_rates[i] & 0x7f) * 5; for (j = 0; j < sband->n_bitrates; j++) if (sband->bitrates[j].bitrate == bitrate) rates |= BIT(j); } ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates; ieee80211_sta_def_wmm_params(sdata, bss); ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED; mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL); ieee80211_led_assoc(local, true); memset(&wrqu, 0, sizeof(wrqu)); memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN); wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL); return res; } static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status, struct ieee802_11_elems *elems, bool beacon) { struct ieee80211_local *local = sdata->local; int freq; struct ieee80211_bss *bss; struct sta_info *sta; struct ieee80211_channel *channel; u64 beacon_timestamp, rx_timestamp; u64 supp_rates = 0; enum ieee80211_band band = rx_status->band; if (elems->ds_params && elems->ds_params_len == 1) freq = ieee80211_channel_to_frequency(elems->ds_params[0]); else freq = rx_status->freq; channel = ieee80211_get_channel(local->hw.wiphy, freq); if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) return; if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) { supp_rates = ieee80211_sta_get_rates(local, elems, band); rcu_read_lock(); sta = sta_info_get(local, mgmt->sa); if (sta) { u64 prev_rates; prev_rates = sta->sta.supp_rates[band]; /* make sure mandatory rates are always added */ sta->sta.supp_rates[band] = supp_rates | ieee80211_mandatory_rates(local, band); #ifdef CONFIG_MAC80211_IBSS_DEBUG if (sta->sta.supp_rates[band] != prev_rates) printk(KERN_DEBUG "%s: updated supp_rates set " "for %pM based on beacon info (0x%llx | " "0x%llx -> 0x%llx)\n", sdata->dev->name, sta->sta.addr, (unsigned long long) prev_rates, (unsigned long long) supp_rates, (unsigned long long) sta->sta.supp_rates[band]); #endif } else { ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); } rcu_read_unlock(); } bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, freq, beacon); if (!bss) return; /* was just updated in ieee80211_bss_info_update */ beacon_timestamp = bss->timestamp; /* * In STA mode, the remaining parameters should not be overridden * by beacons because they're not necessarily accurate there. */ if (sdata->vif.type != NL80211_IFTYPE_ADHOC && bss->last_probe_resp && beacon) { ieee80211_rx_bss_put(local, bss); return; } /* check if we need to merge IBSS */ if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon && bss->capability & WLAN_CAPABILITY_IBSS && bss->freq == local->oper_channel->center_freq && elems->ssid_len == sdata->u.sta.ssid_len && memcmp(elems->ssid, sdata->u.sta.ssid, sdata->u.sta.ssid_len) == 0) { if (rx_status->flag & RX_FLAG_TSFT) { /* in order for correct IBSS merging we need mactime * * since mactime is defined as the time the first data * symbol of the frame hits the PHY, and the timestamp * of the beacon is defined as "the time that the data * symbol containing the first bit of the timestamp is * transmitted to the PHY plus the transmitting STA’s * delays through its local PHY from the MAC-PHY * interface to its interface with the WM" * (802.11 11.1.2) - equals the time this bit arrives at * the receiver - we have to take into account the * offset between the two. * e.g: at 1 MBit that means mactime is 192 usec earlier * (=24 bytes * 8 usecs/byte) than the beacon timestamp. */ int rate; if (rx_status->flag & RX_FLAG_HT) { rate = 65; /* TODO: HT rates */ } else { rate = local->hw.wiphy->bands[band]-> bitrates[rx_status->rate_idx].bitrate; } rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); } else if (local && local->ops && local->ops->get_tsf) /* second best option: get current TSF */ rx_timestamp = local->ops->get_tsf(local_to_hw(local)); else /* can't merge without knowing the TSF */ rx_timestamp = -1LLU; #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", mgmt->sa, mgmt->bssid, (unsigned long long)rx_timestamp, (unsigned long long)beacon_timestamp, (unsigned long long)(rx_timestamp - beacon_timestamp), jiffies); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ if (beacon_timestamp > rx_timestamp) { #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: beacon TSF higher than " "local TSF - IBSS merge with BSSID %pM\n", sdata->dev->name, mgmt->bssid); #endif ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss); ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); } } ieee80211_rx_bss_put(local, bss); } static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status) { size_t baselen; struct ieee802_11_elems elems; struct ieee80211_if_sta *ifsta = &sdata->u.sta; if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) return; /* ignore ProbeResp to foreign address */ baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; if (baselen > len) return; ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, &elems); ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); /* direct probe may be part of the association flow */ if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request)) { printk(KERN_DEBUG "%s direct probe responded\n", sdata->dev->name); ieee80211_authenticate(sdata, ifsta); } } static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status) { struct ieee80211_if_sta *ifsta; size_t baselen; struct ieee802_11_elems elems; struct ieee80211_local *local = sdata->local; u32 changed = 0; bool erp_valid; u8 erp_value = 0; /* Process beacon from the current BSS */ baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; if (baselen > len) return; ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); if (sdata->vif.type != NL80211_IFTYPE_STATION) return; ifsta = &sdata->u.sta; if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) || memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) return; ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param, elems.wmm_param_len); if (elems.erp_info && elems.erp_info_len >= 1) { erp_valid = true; erp_value = elems.erp_info[0]; } else { erp_valid = false; } changed |= ieee80211_handle_bss_capability(sdata, le16_to_cpu(mgmt->u.beacon.capab_info), erp_valid, erp_value); if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) { struct sta_info *sta; struct ieee80211_supported_band *sband; u16 ap_ht_cap_flags; rcu_read_lock(); sta = sta_info_get(local, ifsta->bssid); if (!sta) { rcu_read_unlock(); return; } sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; ieee80211_ht_cap_ie_to_sta_ht_cap(sband, elems.ht_cap_elem, &sta->sta.ht_cap); ap_ht_cap_flags = sta->sta.ht_cap.cap; rcu_read_unlock(); changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, ap_ht_cap_flags); } if (elems.country_elem) { /* Note we are only reviewing this on beacons * for the BSSID we are associated to */ regulatory_hint_11d(local->hw.wiphy, elems.country_elem, elems.country_elem_len); } ieee80211_bss_info_change_notify(sdata, changed); } static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status) { struct ieee80211_local *local = sdata->local; int tx_last_beacon; struct sk_buff *skb; struct ieee80211_mgmt *resp; u8 *pos, *end; if (sdata->vif.type != NL80211_IFTYPE_ADHOC || ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED || len < 24 + 2 || !ifsta->probe_resp) return; if (local->ops->tx_last_beacon) tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local)); else tx_last_beacon = 1; #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" " (tx_last_beacon=%d)\n", sdata->dev->name, mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ if (!tx_last_beacon) return; if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 && memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) return; end = ((u8 *) mgmt) + len; pos = mgmt->u.probe_req.variable; if (pos[0] != WLAN_EID_SSID || pos + 2 + pos[1] > end) { #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " "from %pM\n", sdata->dev->name, mgmt->sa); #endif return; } if (pos[1] != 0 && (pos[1] != ifsta->ssid_len || memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) { /* Ignore ProbeReq for foreign SSID */ return; } /* Reply with ProbeResp */ skb = skb_copy(ifsta->probe_resp, GFP_KERNEL); if (!skb) return; resp = (struct ieee80211_mgmt *) skb->data; memcpy(resp->da, mgmt->sa, ETH_ALEN); #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", sdata->dev->name, resp->da); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ ieee80211_tx_skb(sdata, skb, 0); } void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, struct ieee80211_rx_status *rx_status) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_sta *ifsta; struct ieee80211_mgmt *mgmt; u16 fc; if (skb->len < 24) goto fail; ifsta = &sdata->u.sta; mgmt = (struct ieee80211_mgmt *) skb->data; fc = le16_to_cpu(mgmt->frame_control); switch (fc & IEEE80211_FCTL_STYPE) { case IEEE80211_STYPE_PROBE_REQ: case IEEE80211_STYPE_PROBE_RESP: case IEEE80211_STYPE_BEACON: memcpy(skb->cb, rx_status, sizeof(*rx_status)); case IEEE80211_STYPE_AUTH: case IEEE80211_STYPE_ASSOC_RESP: case IEEE80211_STYPE_REASSOC_RESP: case IEEE80211_STYPE_DEAUTH: case IEEE80211_STYPE_DISASSOC: skb_queue_tail(&ifsta->skb_queue, skb); queue_work(local->hw.workqueue, &ifsta->work); return; } fail: kfree_skb(skb); } static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_rx_status *rx_status; struct ieee80211_if_sta *ifsta; struct ieee80211_mgmt *mgmt; u16 fc; ifsta = &sdata->u.sta; rx_status = (struct ieee80211_rx_status *) skb->cb; mgmt = (struct ieee80211_mgmt *) skb->data; fc = le16_to_cpu(mgmt->frame_control); switch (fc & IEEE80211_FCTL_STYPE) { case IEEE80211_STYPE_PROBE_REQ: ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len, rx_status); break; case IEEE80211_STYPE_PROBE_RESP: ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status); break; case IEEE80211_STYPE_BEACON: ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); break; case IEEE80211_STYPE_AUTH: ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len); break; case IEEE80211_STYPE_ASSOC_RESP: ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0); break; case IEEE80211_STYPE_REASSOC_RESP: ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1); break; case IEEE80211_STYPE_DEAUTH: ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len); break; case IEEE80211_STYPE_DISASSOC: ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len); break; } kfree_skb(skb); } static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; int active = 0; struct sta_info *sta; rcu_read_lock(); list_for_each_entry_rcu(sta, &local->sta_list, list) { if (sta->sdata == sdata && time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, jiffies)) { active++; break; } } rcu_read_unlock(); return active; } static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL); ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); if (ieee80211_sta_active_ibss(sdata)) return; printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " "IBSS networks with same SSID (merge)\n", sdata->dev->name); ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len); } static void ieee80211_sta_timer(unsigned long data) { struct ieee80211_sub_if_data *sdata = (struct ieee80211_sub_if_data *) data; struct ieee80211_if_sta *ifsta = &sdata->u.sta; struct ieee80211_local *local = sdata->local; set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request); queue_work(local->hw.workqueue, &ifsta->work); } static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { struct ieee80211_local *local = sdata->local; if (local->ops->reset_tsf) { /* Reset own TSF to allow time synchronization work. */ local->ops->reset_tsf(local_to_hw(local)); } ifsta->wmm_last_param_set = -1; /* allow any WMM update */ if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN) ifsta->auth_alg = WLAN_AUTH_OPEN; else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY) ifsta->auth_alg = WLAN_AUTH_SHARED_KEY; else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP) ifsta->auth_alg = WLAN_AUTH_LEAP; else ifsta->auth_alg = WLAN_AUTH_OPEN; ifsta->auth_transaction = -1; ifsta->flags &= ~IEEE80211_STA_ASSOCIATED; ifsta->assoc_scan_tries = 0; ifsta->direct_probe_tries = 0; ifsta->auth_tries = 0; ifsta->assoc_tries = 0; netif_tx_stop_all_queues(sdata->dev); netif_carrier_off(sdata->dev); } static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta, const char *ssid, int ssid_len) { int tmp, hidden_ssid; if (ssid_len == ifsta->ssid_len && !memcmp(ifsta->ssid, ssid, ssid_len)) return 1; if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) return 0; hidden_ssid = 1; tmp = ssid_len; while (tmp--) { if (ssid[tmp] != '\0') { hidden_ssid = 0; break; } } if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0)) return 1; if (ssid_len == 1 && ssid[0] == ' ') return 1; return 0; } static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { struct ieee80211_local *local = sdata->local; struct ieee80211_bss *bss; struct ieee80211_supported_band *sband; u8 bssid[ETH_ALEN], *pos; int i; int ret; #if 0 /* Easier testing, use fixed BSSID. */ memset(bssid, 0xfe, ETH_ALEN); #else /* Generate random, not broadcast, locally administered BSSID. Mix in * own MAC address to make sure that devices that do not have proper * random number generator get different BSSID. */ get_random_bytes(bssid, ETH_ALEN); for (i = 0; i < ETH_ALEN; i++) bssid[i] ^= sdata->dev->dev_addr[i]; bssid[0] &= ~0x01; bssid[0] |= 0x02; #endif printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", sdata->dev->name, bssid); bss = ieee80211_rx_bss_add(local, bssid, local->hw.conf.channel->center_freq, sdata->u.sta.ssid, sdata->u.sta.ssid_len); if (!bss) return -ENOMEM; bss->band = local->hw.conf.channel->band; sband = local->hw.wiphy->bands[bss->band]; if (local->hw.conf.beacon_int == 0) local->hw.conf.beacon_int = 100; bss->beacon_int = local->hw.conf.beacon_int; bss->last_update = jiffies; bss->capability = WLAN_CAPABILITY_IBSS; if (sdata->default_key) bss->capability |= WLAN_CAPABILITY_PRIVACY; else sdata->drop_unencrypted = 0; bss->supp_rates_len = sband->n_bitrates; pos = bss->supp_rates; for (i = 0; i < sband->n_bitrates; i++) { int rate = sband->bitrates[i].bitrate; *pos++ = (u8) (rate / 5); } ret = ieee80211_sta_join_ibss(sdata, ifsta, bss); ieee80211_rx_bss_put(local, bss); return ret; } static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { struct ieee80211_local *local = sdata->local; struct ieee80211_bss *bss; int found = 0; u8 bssid[ETH_ALEN]; int active_ibss; if (ifsta->ssid_len == 0) return -EINVAL; active_ibss = ieee80211_sta_active_ibss(sdata); #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", sdata->dev->name, active_ibss); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ spin_lock_bh(&local->bss_lock); list_for_each_entry(bss, &local->bss_list, list) { if (ifsta->ssid_len != bss->ssid_len || memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0 || !(bss->capability & WLAN_CAPABILITY_IBSS)) continue; #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ memcpy(bssid, bss->bssid, ETH_ALEN); found = 1; if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0) break; } spin_unlock_bh(&local->bss_lock); #ifdef CONFIG_MAC80211_IBSS_DEBUG if (found) printk(KERN_DEBUG " sta_find_ibss: selected %pM current " "%pM\n", bssid, ifsta->bssid); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) { int ret; int search_freq; if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) search_freq = bss->freq; else search_freq = local->hw.conf.channel->center_freq; bss = ieee80211_rx_bss_get(local, bssid, search_freq, ifsta->ssid, ifsta->ssid_len); if (!bss) goto dont_join; printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" " based on configured SSID\n", sdata->dev->name, bssid); ret = ieee80211_sta_join_ibss(sdata, ifsta, bss); ieee80211_rx_bss_put(local, bss); return ret; } dont_join: #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG " did not try to join ibss\n"); #endif /* CONFIG_MAC80211_IBSS_DEBUG */ /* Selected IBSS not found in current scan results - try to scan */ if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED && !ieee80211_sta_active_ibss(sdata)) { mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL); } else if (time_after(jiffies, local->last_scan_completed + IEEE80211_SCAN_INTERVAL)) { printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " "join\n", sdata->dev->name); return ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len); } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) { int interval = IEEE80211_SCAN_INTERVAL; if (time_after(jiffies, ifsta->ibss_join_req + IEEE80211_IBSS_JOIN_TIMEOUT)) { if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) && (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS))) return ieee80211_sta_create_ibss(sdata, ifsta); if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) { printk(KERN_DEBUG "%s: IBSS not allowed on" " %d MHz\n", sdata->dev->name, local->hw.conf.channel->center_freq); } /* No IBSS found - decrease scan interval and continue * scanning. */ interval = IEEE80211_SCAN_INTERVAL_SLOW; } ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH; mod_timer(&ifsta->timer, jiffies + interval); return 0; } return 0; } static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { struct ieee80211_local *local = sdata->local; struct ieee80211_bss *bss, *selected = NULL; int top_rssi = 0, freq; spin_lock_bh(&local->bss_lock); freq = local->oper_channel->center_freq; list_for_each_entry(bss, &local->bss_list, list) { if (!(bss->capability & WLAN_CAPABILITY_ESS)) continue; if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL | IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL)) && (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^ !!sdata->default_key)) continue; if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) && bss->freq != freq) continue; if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) && memcmp(bss->bssid, ifsta->bssid, ETH_ALEN)) continue; if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) && !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len)) continue; if (!selected || top_rssi < bss->signal) { selected = bss; top_rssi = bss->signal; } } if (selected) atomic_inc(&selected->users); spin_unlock_bh(&local->bss_lock); if (selected) { ieee80211_set_freq(sdata, selected->freq); if (!(ifsta->flags & IEEE80211_STA_SSID_SET)) ieee80211_sta_set_ssid(sdata, selected->ssid, selected->ssid_len); ieee80211_sta_set_bssid(sdata, selected->bssid); ieee80211_sta_def_wmm_params(sdata, selected); /* Send out direct probe if no probe resp was received or * the one we have is outdated */ if (!selected->last_probe_resp || time_after(jiffies, selected->last_probe_resp + IEEE80211_SCAN_RESULT_EXPIRE)) ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; else ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; ieee80211_rx_bss_put(local, selected); ieee80211_sta_reset_auth(sdata, ifsta); return 0; } else { if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) { ifsta->assoc_scan_tries++; if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) ieee80211_start_scan(sdata, NULL, 0); else ieee80211_start_scan(sdata, ifsta->ssid, ifsta->ssid_len); ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request); } else ifsta->state = IEEE80211_STA_MLME_DISABLED; } return -1; } static void ieee80211_sta_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.sta.work); struct ieee80211_local *local = sdata->local; struct ieee80211_if_sta *ifsta; struct sk_buff *skb; if (!netif_running(sdata->dev)) return; if (local->sw_scanning || local->hw_scanning) return; if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION && sdata->vif.type != NL80211_IFTYPE_ADHOC)) return; ifsta = &sdata->u.sta; while ((skb = skb_dequeue(&ifsta->skb_queue))) ieee80211_sta_rx_queued_mgmt(sdata, skb); if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE && ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE && ifsta->state != IEEE80211_STA_MLME_ASSOCIATE && test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) { ieee80211_start_scan(sdata, ifsta->scan_ssid, ifsta->scan_ssid_len); return; } if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) { if (ieee80211_sta_config_auth(sdata, ifsta)) return; clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request); } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request)) return; switch (ifsta->state) { case IEEE80211_STA_MLME_DISABLED: break; case IEEE80211_STA_MLME_DIRECT_PROBE: ieee80211_direct_probe(sdata, ifsta); break; case IEEE80211_STA_MLME_AUTHENTICATE: ieee80211_authenticate(sdata, ifsta); break; case IEEE80211_STA_MLME_ASSOCIATE: ieee80211_associate(sdata, ifsta); break; case IEEE80211_STA_MLME_ASSOCIATED: ieee80211_associated(sdata, ifsta); break; case IEEE80211_STA_MLME_IBSS_SEARCH: ieee80211_sta_find_ibss(sdata, ifsta); break; case IEEE80211_STA_MLME_IBSS_JOINED: ieee80211_sta_merge_ibss(sdata, ifsta); break; default: WARN_ON(1); break; } if (ieee80211_privacy_mismatch(sdata, ifsta)) { printk(KERN_DEBUG "%s: privacy configuration mismatch and " "mixed-cell disabled - disassociate\n", sdata->dev->name); ieee80211_set_disassoc(sdata, ifsta, false, true, WLAN_REASON_UNSPECIFIED); } } static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) { if (sdata->vif.type == NL80211_IFTYPE_STATION) queue_work(sdata->local->hw.workqueue, &sdata->u.sta.work); } /* interface setup */ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_sta *ifsta; ifsta = &sdata->u.sta; INIT_WORK(&ifsta->work, ieee80211_sta_work); setup_timer(&ifsta->timer, ieee80211_sta_timer, (unsigned long) sdata); skb_queue_head_init(&ifsta->skb_queue); ifsta->capab = WLAN_CAPABILITY_ESS; ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN | IEEE80211_AUTH_ALG_SHARED_KEY; ifsta->flags |= IEEE80211_STA_CREATE_IBSS | IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL; if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4) ifsta->flags |= IEEE80211_STA_WMM_ENABLED; } /* * Add a new IBSS station, will also be called by the RX code when, * in IBSS mode, receiving a frame from a yet-unknown station, hence * must be callable in atomic context. */ struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, u8 *bssid,u8 *addr, u64 supp_rates) { struct ieee80211_local *local = sdata->local; struct sta_info *sta; int band = local->hw.conf.channel->band; /* TODO: Could consider removing the least recently used entry and * allow new one to be added. */ if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { if (net_ratelimit()) { printk(KERN_DEBUG "%s: No room for a new IBSS STA " "entry %pM\n", sdata->dev->name, addr); } return NULL; } if (compare_ether_addr(bssid, sdata->u.sta.bssid)) return NULL; #ifdef CONFIG_MAC80211_VERBOSE_DEBUG printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", wiphy_name(local->hw.wiphy), addr, sdata->dev->name); #endif sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); if (!sta) return NULL; set_sta_flags(sta, WLAN_STA_AUTHORIZED); /* make sure mandatory rates are always added */ sta->sta.supp_rates[band] = supp_rates | ieee80211_mandatory_rates(local, band); rate_control_rate_init(sta); if (sta_info_insert(sta)) return NULL; return sta; } /* configuration hooks */ void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_sta *ifsta) { struct ieee80211_local *local = sdata->local; if (sdata->vif.type != NL80211_IFTYPE_STATION) return; if ((ifsta->flags & (IEEE80211_STA_BSSID_SET | IEEE80211_STA_AUTO_BSSID_SEL)) && (ifsta->flags & (IEEE80211_STA_SSID_SET | IEEE80211_STA_AUTO_SSID_SEL))) { if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) ieee80211_set_disassoc(sdata, ifsta, true, true, WLAN_REASON_DEAUTH_LEAVING); set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request); queue_work(local->hw.workqueue, &ifsta->work); } } int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len) { struct ieee80211_if_sta *ifsta; if (len > IEEE80211_MAX_SSID_LEN) return -EINVAL; ifsta = &sdata->u.sta; if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) { memset(ifsta->ssid, 0, sizeof(ifsta->ssid)); memcpy(ifsta->ssid, ssid, len); ifsta->ssid_len = len; ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET; } if (len) ifsta->flags |= IEEE80211_STA_SSID_SET; else ifsta->flags &= ~IEEE80211_STA_SSID_SET; if (sdata->vif.type == NL80211_IFTYPE_ADHOC && !(ifsta->flags & IEEE80211_STA_BSSID_SET)) { ifsta->ibss_join_req = jiffies; ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH; return ieee80211_sta_find_ibss(sdata, ifsta); } return 0; } int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len) { struct ieee80211_if_sta *ifsta = &sdata->u.sta; memcpy(ssid, ifsta->ssid, ifsta->ssid_len); *len = ifsta->ssid_len; return 0; } int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid) { struct ieee80211_if_sta *ifsta; int res; ifsta = &sdata->u.sta; if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) { memcpy(ifsta->bssid, bssid, ETH_ALEN); res = 0; /* * Hack! See also ieee80211_sta_set_ssid. */ if (netif_running(sdata->dev)) res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID); if (res) { printk(KERN_DEBUG "%s: Failed to config new BSSID to " "the low-level driver\n", sdata->dev->name); return res; } } if (is_valid_ether_addr(bssid)) ifsta->flags |= IEEE80211_STA_BSSID_SET; else ifsta->flags &= ~IEEE80211_STA_BSSID_SET; return 0; } int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len) { struct ieee80211_if_sta *ifsta = &sdata->u.sta; kfree(ifsta->extra_ie); if (len == 0) { ifsta->extra_ie = NULL; ifsta->extra_ie_len = 0; return 0; } ifsta->extra_ie = kmalloc(len, GFP_KERNEL); if (!ifsta->extra_ie) { ifsta->extra_ie_len = 0; return -ENOMEM; } memcpy(ifsta->extra_ie, ie, len); ifsta->extra_ie_len = len; return 0; } int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason) { struct ieee80211_if_sta *ifsta = &sdata->u.sta; printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n", sdata->dev->name, reason); if (sdata->vif.type != NL80211_IFTYPE_STATION && sdata->vif.type != NL80211_IFTYPE_ADHOC) return -EINVAL; ieee80211_set_disassoc(sdata, ifsta, true, true, reason); return 0; } int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason) { struct ieee80211_if_sta *ifsta = &sdata->u.sta; printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n", sdata->dev->name, reason); if (sdata->vif.type != NL80211_IFTYPE_STATION) return -EINVAL; if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED)) return -1; ieee80211_set_disassoc(sdata, ifsta, false, true, reason); return 0; } /* scan finished notification */ void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata = local->scan_sdata; struct ieee80211_if_sta *ifsta; if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) { ifsta = &sdata->u.sta; if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) || (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) && !ieee80211_sta_active_ibss(sdata))) ieee80211_sta_find_ibss(sdata, ifsta); } /* Restart STA timers */ rcu_read_lock(); list_for_each_entry_rcu(sdata, &local->interfaces, list) ieee80211_restart_sta_timer(sdata); rcu_read_unlock(); }