diff options
| -rw-r--r-- | net/mac80211/Makefile | 1 | ||||
| -rw-r--r-- | net/mac80211/ieee80211_i.h | 13 | ||||
| -rw-r--r-- | net/mac80211/mlme.c | 559 | ||||
| -rw-r--r-- | net/mac80211/scan.c | 553 |
4 files changed, 582 insertions, 544 deletions
diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile index a169b0201d6..376280a420a 100644 --- a/net/mac80211/Makefile +++ b/net/mac80211/Makefile @@ -7,6 +7,7 @@ mac80211-y := \ sta_info.o \ wep.o \ wpa.o \ + scan.o \ mlme.o \ iface.o \ rate.o \ diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index a33bbd1ca2b..25dccd5cb2f 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -53,6 +53,12 @@ struct ieee80211_local; * increased memory use (about 2 kB of RAM per entry). */ #define IEEE80211_FRAGMENT_MAX 4 +/* + * Time after which we ignore scan results and no longer report/use + * them in any way. + */ +#define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ) + struct ieee80211_fragment_entry { unsigned long first_frag_time; unsigned int seq; @@ -924,8 +930,13 @@ u64 ieee80211_sta_get_rates(struct ieee80211_local *local, enum ieee80211_band band); void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, int encrypt); +void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, + u8 *ssid, size_t ssid_len); void ieee802_11_parse_elems(u8 *start, size_t len, - struct ieee802_11_elems *elems); + struct ieee802_11_elems *elems); +void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local); +int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata, + u8 *ssid, size_t ssid_len); #ifdef CONFIG_MAC80211_MESH void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata); diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index ba502ce132d..2caea9759b7 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -46,10 +46,6 @@ #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) -#define IEEE80211_PROBE_DELAY (HZ / 33) -#define IEEE80211_CHANNEL_TIME (HZ / 33) -#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5) -#define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ) #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ) @@ -341,8 +337,8 @@ static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, ieee80211_sta_tx(sdata, skb, encrypt); } -static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, - u8 *ssid, size_t ssid_len) +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; @@ -3466,543 +3462,6 @@ int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid) } -static void ieee80211_send_nullfunc(struct ieee80211_local *local, - struct ieee80211_sub_if_data *sdata, - int powersave) -{ - struct sk_buff *skb; - struct ieee80211_hdr *nullfunc; - __le16 fc; - - skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24); - if (!skb) { - printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " - "frame\n", sdata->dev->name); - return; - } - skb_reserve(skb, local->hw.extra_tx_headroom); - - nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24); - memset(nullfunc, 0, 24); - fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | - IEEE80211_FCTL_TODS); - if (powersave) - fc |= cpu_to_le16(IEEE80211_FCTL_PM); - nullfunc->frame_control = fc; - memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN); - memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN); - memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN); - - ieee80211_sta_tx(sdata, skb, 0); -} - - -static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) -{ - if (sdata->vif.type == IEEE80211_IF_TYPE_STA || - ieee80211_vif_is_mesh(&sdata->vif)) - ieee80211_sta_timer((unsigned long)sdata); -} - -void ieee80211_scan_completed(struct ieee80211_hw *hw) -{ - struct ieee80211_local *local = hw_to_local(hw); - struct ieee80211_sub_if_data *sdata; - union iwreq_data wrqu; - - local->last_scan_completed = jiffies; - memset(&wrqu, 0, sizeof(wrqu)); - wireless_send_event(local->scan_sdata->dev, SIOCGIWSCAN, &wrqu, NULL); - - if (local->sta_hw_scanning) { - local->sta_hw_scanning = 0; - if (ieee80211_hw_config(local)) - printk(KERN_DEBUG "%s: failed to restore operational " - "channel after scan\n", wiphy_name(local->hw.wiphy)); - /* Restart STA timer for HW scan case */ - rcu_read_lock(); - list_for_each_entry_rcu(sdata, &local->interfaces, list) - ieee80211_restart_sta_timer(sdata); - rcu_read_unlock(); - - goto done; - } - - local->sta_sw_scanning = 0; - if (ieee80211_hw_config(local)) - printk(KERN_DEBUG "%s: failed to restore operational " - "channel after scan\n", wiphy_name(local->hw.wiphy)); - - - netif_tx_lock_bh(local->mdev); - netif_addr_lock(local->mdev); - local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; - local->ops->configure_filter(local_to_hw(local), - FIF_BCN_PRBRESP_PROMISC, - &local->filter_flags, - local->mdev->mc_count, - local->mdev->mc_list); - - netif_addr_unlock(local->mdev); - netif_tx_unlock_bh(local->mdev); - - rcu_read_lock(); - list_for_each_entry_rcu(sdata, &local->interfaces, list) { - /* Tell AP we're back */ - if (sdata->vif.type == IEEE80211_IF_TYPE_STA) { - if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { - ieee80211_send_nullfunc(local, sdata, 0); - netif_tx_wake_all_queues(sdata->dev); - } - } else - netif_tx_wake_all_queues(sdata->dev); - - ieee80211_restart_sta_timer(sdata); - } - rcu_read_unlock(); - - done: - sdata = local->scan_sdata; - if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { - struct ieee80211_if_sta *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); - } -} -EXPORT_SYMBOL(ieee80211_scan_completed); - -void ieee80211_sta_scan_work(struct work_struct *work) -{ - struct ieee80211_local *local = - container_of(work, struct ieee80211_local, scan_work.work); - struct ieee80211_sub_if_data *sdata = local->scan_sdata; - struct ieee80211_supported_band *sband; - struct ieee80211_channel *chan; - int skip; - unsigned long next_delay = 0; - - if (!local->sta_sw_scanning) - return; - - switch (local->scan_state) { - case SCAN_SET_CHANNEL: - /* - * Get current scan band. scan_band may be IEEE80211_NUM_BANDS - * after we successfully scanned the last channel of the last - * band (and the last band is supported by the hw) - */ - if (local->scan_band < IEEE80211_NUM_BANDS) - sband = local->hw.wiphy->bands[local->scan_band]; - else - sband = NULL; - - /* - * If we are at an unsupported band and have more bands - * left to scan, advance to the next supported one. - */ - while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) { - local->scan_band++; - sband = local->hw.wiphy->bands[local->scan_band]; - local->scan_channel_idx = 0; - } - - /* if no more bands/channels left, complete scan */ - if (!sband || local->scan_channel_idx >= sband->n_channels) { - ieee80211_scan_completed(local_to_hw(local)); - return; - } - skip = 0; - chan = &sband->channels[local->scan_channel_idx]; - - if (chan->flags & IEEE80211_CHAN_DISABLED || - (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && - chan->flags & IEEE80211_CHAN_NO_IBSS)) - skip = 1; - - if (!skip) { - local->scan_channel = chan; - if (ieee80211_hw_config(local)) { - printk(KERN_DEBUG "%s: failed to set freq to " - "%d MHz for scan\n", wiphy_name(local->hw.wiphy), - chan->center_freq); - skip = 1; - } - } - - /* advance state machine to next channel/band */ - local->scan_channel_idx++; - if (local->scan_channel_idx >= sband->n_channels) { - /* - * scan_band may end up == IEEE80211_NUM_BANDS, but - * we'll catch that case above and complete the scan - * if that is the case. - */ - local->scan_band++; - local->scan_channel_idx = 0; - } - - if (skip) - break; - - next_delay = IEEE80211_PROBE_DELAY + - usecs_to_jiffies(local->hw.channel_change_time); - local->scan_state = SCAN_SEND_PROBE; - break; - case SCAN_SEND_PROBE: - next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; - local->scan_state = SCAN_SET_CHANNEL; - - if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN) - break; - ieee80211_send_probe_req(sdata, NULL, local->scan_ssid, - local->scan_ssid_len); - next_delay = IEEE80211_CHANNEL_TIME; - break; - } - - if (local->sta_sw_scanning) - queue_delayed_work(local->hw.workqueue, &local->scan_work, - next_delay); -} - - -static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata, - u8 *ssid, size_t ssid_len) -{ - struct ieee80211_local *local = scan_sdata->local; - struct ieee80211_sub_if_data *sdata; - - if (ssid_len > IEEE80211_MAX_SSID_LEN) - return -EINVAL; - - /* MLME-SCAN.request (page 118) page 144 (11.1.3.1) - * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS - * BSSID: MACAddress - * SSID - * ScanType: ACTIVE, PASSIVE - * ProbeDelay: delay (in microseconds) to be used prior to transmitting - * a Probe frame during active scanning - * ChannelList - * MinChannelTime (>= ProbeDelay), in TU - * MaxChannelTime: (>= MinChannelTime), in TU - */ - - /* MLME-SCAN.confirm - * BSSDescriptionSet - * ResultCode: SUCCESS, INVALID_PARAMETERS - */ - - if (local->sta_sw_scanning || local->sta_hw_scanning) { - if (local->scan_sdata == scan_sdata) - return 0; - return -EBUSY; - } - - if (local->ops->hw_scan) { - int rc = local->ops->hw_scan(local_to_hw(local), - ssid, ssid_len); - if (!rc) { - local->sta_hw_scanning = 1; - local->scan_sdata = scan_sdata; - } - return rc; - } - - local->sta_sw_scanning = 1; - - rcu_read_lock(); - list_for_each_entry_rcu(sdata, &local->interfaces, list) { - if (sdata->vif.type == IEEE80211_IF_TYPE_STA) { - if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { - netif_tx_stop_all_queues(sdata->dev); - ieee80211_send_nullfunc(local, sdata, 1); - } - } else - netif_tx_stop_all_queues(sdata->dev); - } - rcu_read_unlock(); - - if (ssid) { - local->scan_ssid_len = ssid_len; - memcpy(local->scan_ssid, ssid, ssid_len); - } else - local->scan_ssid_len = 0; - local->scan_state = SCAN_SET_CHANNEL; - local->scan_channel_idx = 0; - local->scan_band = IEEE80211_BAND_2GHZ; - local->scan_sdata = scan_sdata; - - netif_addr_lock_bh(local->mdev); - local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; - local->ops->configure_filter(local_to_hw(local), - FIF_BCN_PRBRESP_PROMISC, - &local->filter_flags, - local->mdev->mc_count, - local->mdev->mc_list); - netif_addr_unlock_bh(local->mdev); - - /* TODO: start scan as soon as all nullfunc frames are ACKed */ - queue_delayed_work(local->hw.workqueue, &local->scan_work, - IEEE80211_CHANNEL_TIME); - - return 0; -} - - -int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len) -{ - struct ieee80211_if_sta *ifsta = &sdata->u.sta; - struct ieee80211_local *local = sdata->local; - - if (sdata->vif.type != IEEE80211_IF_TYPE_STA) - return ieee80211_sta_start_scan(sdata, ssid, ssid_len); - - if (local->sta_sw_scanning || local->sta_hw_scanning) { - if (local->scan_sdata == sdata) - return 0; - return -EBUSY; - } - - ifsta->scan_ssid_len = ssid_len; - if (ssid_len) - memcpy(ifsta->scan_ssid, ssid, ssid_len); - set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request); - queue_work(local->hw.workqueue, &ifsta->work); - return 0; -} - - -static void ieee80211_sta_add_scan_ies(struct iw_request_info *info, - struct ieee80211_sta_bss *bss, - char **current_ev, char *end_buf) -{ - u8 *pos, *end, *next; - struct iw_event iwe; - - if (bss == NULL || bss->ies == NULL) - 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->ies; - end = pos + bss->ies_len; - - 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 char * -ieee80211_sta_scan_result(struct ieee80211_local *local, - struct iw_request_info *info, - struct ieee80211_sta_bss *bss, - char *current_ev, char *end_buf) -{ - struct iw_event iwe; - char *buf; - - if (time_after(jiffies, - bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE)) - return current_ev; - - memset(&iwe, 0, sizeof(iwe)); - iwe.cmd = SIOCGIWAP; - iwe.u.ap_addr.sa_family = ARPHRD_ETHER; - memcpy(iwe.u.ap_addr.sa_data, bss->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 = SIOCGIWESSID; - if (bss_mesh_cfg(bss)) { - iwe.u.data.length = bss_mesh_id_len(bss); - iwe.u.data.flags = 1; - current_ev = iwe_stream_add_point(info, current_ev, end_buf, - &iwe, bss_mesh_id(bss)); - } else { - iwe.u.data.length = bss->ssid_len; - iwe.u.data.flags = 1; - current_ev = iwe_stream_add_point(info, current_ev, end_buf, - &iwe, bss->ssid); - } - - if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) - || bss_mesh_cfg(bss)) { - memset(&iwe, 0, sizeof(iwe)); - iwe.cmd = SIOCGIWMODE; - if (bss_mesh_cfg(bss)) - iwe.u.mode = IW_MODE_MESH; - else if (bss->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); - } - - memset(&iwe, 0, sizeof(iwe)); - iwe.cmd = SIOCGIWFREQ; - iwe.u.freq.m = ieee80211_frequency_to_channel(bss->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->freq; - iwe.u.freq.e = 6; - current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, - IW_EV_FREQ_LEN); - memset(&iwe, 0, sizeof(iwe)); - iwe.cmd = IWEVQUAL; - iwe.u.qual.qual = bss->qual; - iwe.u.qual.level = bss->signal; - iwe.u.qual.noise = bss->noise; - iwe.u.qual.updated = local->wstats_flags; - 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->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, ""); - - ieee80211_sta_add_scan_ies(info, bss, ¤t_ev, end_buf); - - if (bss->supp_rates_len > 0) { - /* display all supported rates in readable format */ - char *p = current_ev + iwe_stream_lcp_len(info); - int i; - - 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 < bss->supp_rates_len; i++) { - iwe.u.bitrate.value = ((bss->supp_rates[i] & - 0x7f) * 500000); - p = iwe_stream_add_value(info, current_ev, p, - end_buf, &iwe, IW_EV_PARAM_LEN); - } - current_ev = p; - } - - buf = kmalloc(30, GFP_ATOMIC); - if (buf) { - memset(&iwe, 0, sizeof(iwe)); - iwe.cmd = IWEVCUSTOM; - sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp)); - 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: %dms ago", - jiffies_to_msecs(jiffies - bss->last_update)); - iwe.u.data.length = strlen(buf); - current_ev = iwe_stream_add_point(info, current_ev, - end_buf, &iwe, buf); - kfree(buf); - } - - if (bss_mesh_cfg(bss)) { - u8 *cfg = bss_mesh_cfg(bss); - buf = kmalloc(50, GFP_ATOMIC); - if (buf) { - memset(&iwe, 0, sizeof(iwe)); - iwe.cmd = IWEVCUSTOM; - sprintf(buf, "Mesh network (version %d)", 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 Protocol ID: " - "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], - cfg[4]); - 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%02X%02X%02X", cfg[5], cfg[6], cfg[7], - cfg[8]); - 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%02X%02X%02X", cfg[9], cfg[10], - cfg[11], cfg[12]); - iwe.u.data.length = strlen(buf); - current_ev = iwe_stream_add_point(info, current_ev, - end_buf, - &iwe, buf); - sprintf(buf, "Channel Precedence: " - "0x%02X%02X%02X%02X", cfg[13], cfg[14], - cfg[15], cfg[16]); - iwe.u.data.length = strlen(buf); - current_ev = iwe_stream_add_point(info, current_ev, - end_buf, - &iwe, buf); - kfree(buf); - } - } - - return current_ev; -} - - -int ieee80211_sta_scan_results(struct ieee80211_local *local, - struct iw_request_info *info, - char *buf, size_t len) -{ - char *current_ev = buf; - char *end_buf = buf + len; - struct ieee80211_sta_bss *bss; - - spin_lock_bh(&local->sta_bss_lock); - list_for_each_entry(bss, &local->sta_bss_list, list) { - if (buf + len - current_ev <= IW_EV_ADDR_LEN) { - spin_unlock_bh(&local->sta_bss_lock); - return -E2BIG; - } - current_ev = ieee80211_sta_scan_result(local, info, bss, - current_ev, end_buf); - } - spin_unlock_bh(&local->sta_bss_lock); - return current_ev - buf; -} - - 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; @@ -4290,3 +3749,17 @@ void ieee80211_sta_work(struct work_struct *work) WLAN_REASON_UNSPECIFIED); } } + +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->vif.type == IEEE80211_IF_TYPE_IBSS) { + 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); + } +} diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c new file mode 100644 index 00000000000..68fa782acd7 --- /dev/null +++ b/net/mac80211/scan.c @@ -0,0 +1,553 @@ +/* + * BSS client mode implementation + * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> + * Copyright 2004, Instant802 Networks, Inc. + * Copyright 2005, Devicescape Software, Inc. + * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> + * Copyright 2007, Michael Wu <flamingice@sourmilk.net> + * + * 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 <linux/wireless.h> +#include <linux/if_arp.h> +#include <net/mac80211.h> +#include <net/iw_handler.h> + +#include "ieee80211_i.h" + +#define IEEE80211_PROBE_DELAY (HZ / 33) +#define IEEE80211_CHANNEL_TIME (HZ / 33) +#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5) + + +static void ieee80211_send_nullfunc(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + int powersave) +{ + struct sk_buff *skb; + struct ieee80211_hdr *nullfunc; + __le16 fc; + + skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24); + if (!skb) { + printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " + "frame\n", sdata->dev->name); + return; + } + skb_reserve(skb, local->hw.extra_tx_headroom); + + nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24); + memset(nullfunc, 0, 24); + fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | + IEEE80211_FCTL_TODS); + if (powersave) + fc |= cpu_to_le16(IEEE80211_FCTL_PM); + nullfunc->frame_control = fc; + memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN); + memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN); + memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN); + + ieee80211_sta_tx(sdata, skb, 0); +} + +static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) +{ + if (sdata->vif.type == IEEE80211_IF_TYPE_STA || + ieee80211_vif_is_mesh(&sdata->vif)) + ieee80211_sta_timer((unsigned long)sdata); +} + +void ieee80211_scan_completed(struct ieee80211_hw *hw) +{ + struct ieee80211_local *local = hw_to_local(hw); + struct ieee80211_sub_if_data *sdata; + union iwreq_data wrqu; + + local->last_scan_completed = jiffies; + memset(&wrqu, 0, sizeof(wrqu)); + wireless_send_event(local->scan_sdata->dev, SIOCGIWSCAN, &wrqu, NULL); + + if (local->sta_hw_scanning) { + local->sta_hw_scanning = 0; + if (ieee80211_hw_config(local)) + printk(KERN_DEBUG "%s: failed to restore operational " + "channel after scan\n", wiphy_name(local->hw.wiphy)); + /* Restart STA timer for HW scan case */ + rcu_read_lock(); + list_for_each_entry_rcu(sdata, &local->interfaces, list) + ieee80211_restart_sta_timer(sdata); + rcu_read_unlock(); + + goto done; + } + + local->sta_sw_scanning = 0; + if (ieee80211_hw_config(local)) + printk(KERN_DEBUG "%s: failed to restore operational " + "channel after scan\n", wiphy_name(local->hw.wiphy)); + + + netif_tx_lock_bh(local->mdev); + netif_addr_lock(local->mdev); + local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; + local->ops->configure_filter(local_to_hw(local), + FIF_BCN_PRBRESP_PROMISC, + &local->filter_flags, + local->mdev->mc_count, + local->mdev->mc_list); + + netif_addr_unlock(local->mdev); + netif_tx_unlock_bh(local->mdev); + + rcu_read_lock(); + list_for_each_entry_rcu(sdata, &local->interfaces, list) { + /* Tell AP we're back */ + if (sdata->vif.type == IEEE80211_IF_TYPE_STA) { + if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { + ieee80211_send_nullfunc(local, sdata, 0); + netif_tx_wake_all_queues(sdata->dev); + } + } else + netif_tx_wake_all_queues(sdata->dev); + + ieee80211_restart_sta_timer(sdata); + } + rcu_read_unlock(); + + done: + ieee80211_mlme_notify_scan_completed(local); +} +EXPORT_SYMBOL(ieee80211_scan_completed); + + +void ieee80211_sta_scan_work(struct work_struct *work) +{ + struct ieee80211_local *local = + container_of(work, struct ieee80211_local, scan_work.work); + struct ieee80211_sub_if_data *sdata = local->scan_sdata; + struct ieee80211_supported_band *sband; + struct ieee80211_channel *chan; + int skip; + unsigned long next_delay = 0; + + if (!local->sta_sw_scanning) + return; + + switch (local->scan_state) { + case SCAN_SET_CHANNEL: + /* + * Get current scan band. scan_band may be IEEE80211_NUM_BANDS + * after we successfully scanned the last channel of the last + * band (and the last band is supported by the hw) + */ + if (local->scan_band < IEEE80211_NUM_BANDS) + sband = local->hw.wiphy->bands[local->scan_band]; + else + sband = NULL; + + /* + * If we are at an unsupported band and have more bands + * left to scan, advance to the next supported one. + */ + while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) { + local->scan_band++; + sband = local->hw.wiphy->bands[local->scan_band]; + local->scan_channel_idx = 0; + } + + /* if no more bands/channels left, complete scan */ + if (!sband || local->scan_channel_idx >= sband->n_channels) { + ieee80211_scan_completed(local_to_hw(local)); + return; + } + skip = 0; + chan = &sband->channels[local->scan_channel_idx]; + + if (chan->flags & IEEE80211_CHAN_DISABLED || + (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && + chan->flags & IEEE80211_CHAN_NO_IBSS)) + skip = 1; + + if (!skip) { + local->scan_channel = chan; + if (ieee80211_hw_config(local)) { + printk(KERN_DEBUG "%s: failed to set freq to " + "%d MHz for scan\n", wiphy_name(local->hw.wiphy), + chan->center_freq); + skip = 1; + } + } + + /* advance state machine to next channel/band */ + local->scan_channel_idx++; + if (local->scan_channel_idx >= sband->n_channels) { + /* + * scan_band may end up == IEEE80211_NUM_BANDS, but + * we'll catch that case above and complete the scan + * if that is the case. + */ + local->scan_band++; + local->scan_channel_idx = 0; + } + + if (skip) + break; + + next_delay = IEEE80211_PROBE_DELAY + + usecs_to_jiffies(local->hw.channel_change_time); + local->scan_state = SCAN_SEND_PROBE; + break; + case SCAN_SEND_PROBE: + next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; + local->scan_state = SCAN_SET_CHANNEL; + + if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN) + break; + ieee80211_send_probe_req(sdata, NULL, local->scan_ssid, + local->scan_ssid_len); + next_delay = IEEE80211_CHANNEL_TIME; + break; + } + + if (local->sta_sw_scanning) + queue_delayed_work(local->hw.workqueue, &local->scan_work, + next_delay); +} + + +int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata, + u8 *ssid, size_t ssid_len) +{ + struct ieee80211_local *local = scan_sdata->local; + struct ieee80211_sub_if_data *sdata; + + if (ssid_len > IEEE80211_MAX_SSID_LEN) + return -EINVAL; + + /* MLME-SCAN.request (page 118) page 144 (11.1.3.1) + * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS + * BSSID: MACAddress + * SSID + * ScanType: ACTIVE, PASSIVE + * ProbeDelay: delay (in microseconds) to be used prior to transmitting + * a Probe frame during active scanning + * ChannelList + * MinChannelTime (>= ProbeDelay), in TU + * MaxChannelTime: (>= MinChannelTime), in TU + */ + + /* MLME-SCAN.confirm + * BSSDescriptionSet + * ResultCode: SUCCESS, INVALID_PARAMETERS + */ + + if (local->sta_sw_scanning || local->sta_hw_scanning) { + if (local->scan_sdata == scan_sdata) + return 0; + return -EBUSY; + } + + if (local->ops->hw_scan) { + int rc = local->ops->hw_scan(local_to_hw(local), + ssid, ssid_len); + if (!rc) { + local->sta_hw_scanning = 1; + local->scan_sdata = scan_sdata; + } + return rc; + } + + local->sta_sw_scanning = 1; + + rcu_read_lock(); + list_for_each_entry_rcu(sdata, &local->interfaces, list) { + if (sdata->vif.type == IEEE80211_IF_TYPE_STA) { + if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { + netif_tx_stop_all_queues(sdata->dev); + ieee80211_send_nullfunc(local, sdata, 1); + } + } else + netif_tx_stop_all_queues(sdata->dev); + } + rcu_read_unlock(); + + if (ssid) { + local->scan_ssid_len = ssid_len; + memcpy(local->scan_ssid, ssid, ssid_len); + } else + local->scan_ssid_len = 0; + local->scan_state = SCAN_SET_CHANNEL; + local->scan_channel_idx = 0; + local->scan_band = IEEE80211_BAND_2GHZ; + local->scan_sdata = scan_sdata; + + netif_addr_lock_bh(local->mdev); + local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; + local->ops->configure_filter(local_to_hw(local), + FIF_BCN_PRBRESP_PROMISC, + &local->filter_flags, + local->mdev->mc_count, + local->mdev->mc_list); + netif_addr_unlock_bh(local->mdev); + + /* TODO: start scan as soon as all nullfunc frames are ACKed */ + queue_delayed_work(local->hw.workqueue, &local->scan_work, + IEEE80211_CHANNEL_TIME); + + return 0; +} + + +int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len) +{ + struct ieee80211_if_sta *ifsta = &sdata->u.sta; + struct ieee80211_local *local = sdata->local; + + if (sdata->vif.type != IEEE80211_IF_TYPE_STA) + return ieee80211_sta_start_scan(sdata, ssid, ssid_len); + + if (local->sta_sw_scanning || local->sta_hw_scanning) { + if (local->scan_sdata == sdata) + return 0; + return -EBUSY; + } + + ifsta->scan_ssid_len = ssid_len; + if (ssid_len) + memcpy(ifsta->scan_ssid, ssid, ssid_len); + set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request); + queue_work(local->hw.workqueue, &ifsta->work); + return 0; +} + + +static void ieee80211_sta_add_scan_ies(struct iw_request_info *info, + struct ieee80211_sta_bss *bss, + char **current_ev, char *end_buf) +{ + u8 *pos, *end, *next; + struct iw_event iwe; + + if (bss == NULL || bss->ies == NULL) + 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->ies; + end = pos + bss->ies_len; + + 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 char * +ieee80211_sta_scan_result(struct ieee80211_local *local, + struct iw_request_info *info, + struct ieee80211_sta_bss *bss, + char *current_ev, char *end_buf) +{ + struct iw_event iwe; + char *buf; + + if (time_after(jiffies, + bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE)) + return current_ev; + + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWAP; + iwe.u.ap_addr.sa_family = ARPHRD_ETHER; + memcpy(iwe.u.ap_addr.sa_data, bss->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 = SIOCGIWESSID; + if (bss_mesh_cfg(bss)) { + iwe.u.data.length = bss_mesh_id_len(bss); + iwe.u.data.flags = 1; + current_ev = iwe_stream_add_point(info, current_ev, end_buf, + &iwe, bss_mesh_id(bss)); + } else { + iwe.u.data.length = bss->ssid_len; + iwe.u.data.flags = 1; + current_ev = iwe_stream_add_point(info, current_ev, end_buf, + &iwe, bss->ssid); + } + + if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) + || bss_mesh_cfg(bss)) { + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWMODE; + if (bss_mesh_cfg(bss)) + iwe.u.mode = IW_MODE_MESH; + else if (bss->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); + } + + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = SIOCGIWFREQ; + iwe.u.freq.m = ieee80211_frequency_to_channel(bss->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->freq; + iwe.u.freq.e = 6; + current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, + IW_EV_FREQ_LEN); + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVQUAL; + iwe.u.qual.qual = bss->qual; + iwe.u.qual.level = bss->signal; + iwe.u.qual.noise = bss->noise; + iwe.u.qual.updated = local->wstats_flags; + 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->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, ""); + + ieee80211_sta_add_scan_ies(info, bss, ¤t_ev, end_buf); + + if (bss->supp_rates_len > 0) { + /* display all supported rates in readable format */ + char *p = current_ev + iwe_stream_lcp_len(info); + int i; + + 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 < bss->supp_rates_len; i++) { + iwe.u.bitrate.value = ((bss->supp_rates[i] & + 0x7f) * 500000); + p = iwe_stream_add_value(info, current_ev, p, + end_buf, &iwe, IW_EV_PARAM_LEN); + } + current_ev = p; + } + + buf = kmalloc(30, GFP_ATOMIC); + if (buf) { + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVCUSTOM; + sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp)); + 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: %dms ago", + jiffies_to_msecs(jiffies - bss->last_update)); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, &iwe, buf); + kfree(buf); + } + + if (bss_mesh_cfg(bss)) { + u8 *cfg = bss_mesh_cfg(bss); + buf = kmalloc(50, GFP_ATOMIC); + if (buf) { + memset(&iwe, 0, sizeof(iwe)); + iwe.cmd = IWEVCUSTOM; + sprintf(buf, "Mesh network (version %d)", 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 Protocol ID: " + "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], + cfg[4]); + 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%02X%02X%02X", cfg[5], cfg[6], cfg[7], + cfg[8]); + 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%02X%02X%02X", cfg[9], cfg[10], + cfg[11], cfg[12]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + sprintf(buf, "Channel Precedence: " + "0x%02X%02X%02X%02X", cfg[13], cfg[14], + cfg[15], cfg[16]); + iwe.u.data.length = strlen(buf); + current_ev = iwe_stream_add_point(info, current_ev, + end_buf, + &iwe, buf); + kfree(buf); + } + } + + return current_ev; +} + + +int ieee80211_sta_scan_results(struct ieee80211_local *local, + struct iw_request_info *info, + char *buf, size_t len) +{ + char *current_ev = buf; + char *end_buf = buf + len; + struct ieee80211_sta_bss *bss; + + spin_lock_bh(&local->sta_bss_lock); + list_for_each_entry(bss, &local->sta_bss_list, list) { + if (buf + len - current_ev <= IW_EV_ADDR_LEN) { + spin_unlock_bh(&local->sta_bss_lock); + return -E2BIG; + } + current_ev = ieee80211_sta_scan_result(local, info, bss, + current_ev, end_buf); + } + spin_unlock_bh(&local->sta_bss_lock); + return current_ev - buf; +} |