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mac80211: enable IBSS merging
enable IBSS cell merging. if an IBSS beacon with the same channel, same ESSID and a TSF higher than the local TSF (mactime) is received, we have to join its BSSID. while this might not be immediately apparent from reading the 802.11 standard it is compliant and necessary to make IBSS mode functional in many cases. most drivers have a similar behaviour. * move the relevant code section (previously only containing debug code) down to the end of the function, so we can reuse the bss structure. * we have to compare the mactime (TSF at the time of packet receive) rather than the current TSF. since mactime is defined as the time the first data symbol arrived we add the time until byte 24 where the timestamp resides, since this is how the beacon timestamp is defined. as some some drivers are not able to give a reliable mactime we fall back to use the current TSF, which will be enough to catch most (but not all) cases where an IBSS merge is necessary. * in IBSS mode we want to allow beacons to override probe response info so we can correctly do merges. * we don't only configure beacons based on scan results, so change that message. * to enable this we have to let all beacons thru in IBSS mode, even if they have a different BSSID. Signed-off-by: Bruno Randolf <bruno@thinktube.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bruno Randolf
John W. Linville
parent
a607268a0d
commit
9d9bf77d16
@ -276,7 +276,8 @@ struct ieee80211_tx_control {
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* @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on
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* the frame.
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* @RX_FLAG_TSFT: The timestamp passed in the RX status (@mactime field)
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* is valid.
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* is valid. This is useful in monitor mode and necessary for beacon frames
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* to enable IBSS merging.
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*/
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enum mac80211_rx_flags {
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RX_FLAG_MMIC_ERROR = 1<<0,
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@ -2199,7 +2199,7 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
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struct ieee80211_sta_bss *bss;
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struct sta_info *sta;
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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u64 timestamp;
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u64 beacon_timestamp, rx_timestamp;
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DECLARE_MAC_BUF(mac);
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DECLARE_MAC_BUF(mac2);
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@ -2216,31 +2216,7 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
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if (baselen > len)
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return;
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timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
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if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
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memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
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#ifdef CONFIG_MAC80211_IBSS_DEBUG
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static unsigned long last_tsf_debug = 0;
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u64 tsf;
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if (local->ops->get_tsf)
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tsf = local->ops->get_tsf(local_to_hw(local));
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else
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tsf = -1LLU;
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if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
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printk(KERN_DEBUG "RX beacon SA=%s BSSID="
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"%s TSF=0x%llx BCN=0x%llx diff=%lld "
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"@%lu\n",
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print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->bssid),
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(unsigned long long)tsf,
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(unsigned long long)timestamp,
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(unsigned long long)(tsf - timestamp),
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jiffies);
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last_tsf_debug = jiffies;
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}
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#endif /* CONFIG_MAC80211_IBSS_DEBUG */
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}
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beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
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ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
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if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
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@ -2326,8 +2302,10 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
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bss->band = rx_status->band;
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if (bss->probe_resp && beacon) {
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/* Do not allow beacon to override data from Probe Response. */
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if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
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bss->probe_resp && beacon) {
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/* STA mode:
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* Do not allow beacon to override data from Probe Response. */
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ieee80211_rx_bss_put(dev, bss);
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return;
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}
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@ -2424,13 +2402,67 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
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bss->ht_ie_len = 0;
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}
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bss->timestamp = timestamp;
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bss->timestamp = beacon_timestamp;
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bss->last_update = jiffies;
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bss->rssi = rx_status->ssi;
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bss->signal = rx_status->signal;
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bss->noise = rx_status->noise;
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if (!beacon)
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bss->probe_resp++;
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/* check if we need to merge IBSS */
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if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
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!local->sta_sw_scanning && !local->sta_hw_scanning &&
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mgmt->u.beacon.capab_info & WLAN_CAPABILITY_IBSS &&
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bss->freq == local->oper_channel->center_freq &&
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elems.ssid_len == sdata->u.sta.ssid_len &&
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memcmp(elems.ssid, sdata->u.sta.ssid, sdata->u.sta.ssid_len) == 0) {
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if (rx_status->flag & RX_FLAG_TSFT) {
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/* in order for correct IBSS merging we need mactime
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*
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* since mactime is defined as the time the first data
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* symbol of the frame hits the PHY, and the timestamp
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* of the beacon is defined as "the time that the data
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* symbol containing the first bit of the timestamp is
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* transmitted to the PHY plus the transmitting STA’s
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* delays through its local PHY from the MAC-PHY
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* interface to its interface with the WM"
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* (802.11 11.1.2) - equals the time this bit arrives at
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* the receiver - we have to take into account the
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* offset between the two.
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* e.g: at 1 MBit that means mactime is 192 usec earlier
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* (=24 bytes * 8 usecs/byte) than the beacon timestamp.
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*/
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int rate = local->hw.wiphy->bands[rx_status->band]->
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bitrates[rx_status->rate_idx].bitrate;
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rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
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} else if (local && local->ops && local->ops->get_tsf)
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/* second best option: get current TSF */
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rx_timestamp = local->ops->get_tsf(local_to_hw(local));
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else
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/* can't merge without knowing the TSF */
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rx_timestamp = -1LLU;
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#ifdef CONFIG_MAC80211_IBSS_DEBUG
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printk(KERN_DEBUG "RX beacon SA=%s BSSID="
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"%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
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print_mac(mac, mgmt->sa),
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print_mac(mac2, mgmt->bssid),
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(unsigned long long)rx_timestamp,
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(unsigned long long)beacon_timestamp,
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(unsigned long long)(rx_timestamp - beacon_timestamp),
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jiffies);
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#endif /* CONFIG_MAC80211_IBSS_DEBUG */
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if (beacon_timestamp > rx_timestamp) {
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if (CONFIG_MAC80211_IBSS_DEBUG || net_ratelimit())
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printk(KERN_DEBUG "%s: beacon TSF higher than "
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"local TSF - IBSS merge with BSSID %s\n",
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dev->name, print_mac(mac, mgmt->bssid));
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ieee80211_sta_join_ibss(dev, &sdata->u.sta, bss);
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ieee80211_ibss_add_sta(dev, NULL,
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mgmt->bssid, mgmt->sa);
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}
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}
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ieee80211_rx_bss_put(dev, bss);
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}
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@ -1695,7 +1695,10 @@ static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
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case IEEE80211_IF_TYPE_IBSS:
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if (!bssid)
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return 0;
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if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
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if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
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(rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
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return 1;
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else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
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if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
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return 0;
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rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
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