diff options
Diffstat (limited to 'net/mac80211/work.c')
| -rw-r--r-- | net/mac80211/work.c | 1100 |
1 files changed, 1100 insertions, 0 deletions
diff --git a/net/mac80211/work.c b/net/mac80211/work.c new file mode 100644 index 0000000..1e1ea30 --- /dev/null +++ b/net/mac80211/work.c @@ -0,0 +1,1100 @@ +/* + * mac80211 work implementation + * + * Copyright 2003-2008, Jouni Malinen <j@w1.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> + * Copyright 2009, Johannes Berg <johannes@sipsolutions.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/delay.h> +#include <linux/if_ether.h> +#include <linux/skbuff.h> +#include <linux/if_arp.h> +#include <linux/etherdevice.h> +#include <linux/crc32.h> +#include <net/mac80211.h> +#include <asm/unaligned.h> + +#include "ieee80211_i.h" +#include "rate.h" + +#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_MAX_PROBE_TRIES 5 + +enum work_action { + WORK_ACT_NONE, + WORK_ACT_TIMEOUT, + WORK_ACT_DONE, +}; + + +/* utils */ +static inline void ASSERT_WORK_MTX(struct ieee80211_local *local) +{ + WARN_ON(!mutex_is_locked(&local->work_mtx)); +} + +/* + * We can have multiple work items (and connection probing) + * scheduling this timer, but we need to take care to only + * reschedule it when it should fire _earlier_ than it was + * asked for before, or if it's not pending right now. This + * function ensures that. Note that it then is required to + * run this function for all timeouts after the first one + * has happened -- the work that runs from this timer will + * do that. + */ +static void run_again(struct ieee80211_local *local, + unsigned long timeout) +{ + ASSERT_WORK_MTX(local); + + if (!timer_pending(&local->work_timer) || + time_before(timeout, local->work_timer.expires)) + mod_timer(&local->work_timer, timeout); +} + +static void work_free_rcu(struct rcu_head *head) +{ + struct ieee80211_work *wk = + container_of(head, struct ieee80211_work, rcu_head); + + kfree(wk); +} + +void free_work(struct ieee80211_work *wk) +{ + call_rcu(&wk->rcu_head, work_free_rcu); +} + +static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len, + struct ieee80211_supported_band *sband, + u32 *rates) +{ + int i, j, count; + *rates = 0; + count = 0; + for (i = 0; i < supp_rates_len; i++) { + int rate = (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; +} + +/* frame sending functions */ + +static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie, + struct ieee80211_supported_band *sband, + struct ieee80211_channel *channel, + enum ieee80211_smps_mode smps) +{ + struct ieee80211_ht_info *ht_info; + u8 *pos; + u32 flags = channel->flags; + u16 cap = sband->ht_cap.cap; + __le16 tmp; + + if (!sband->ht_cap.ht_supported) + return; + + if (!ht_info_ie) + return; + + if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info)) + return; + + ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2); + + /* determine capability flags */ + + if (ieee80211_disable_40mhz_24ghz && + sband->band == IEEE80211_BAND_2GHZ) { + cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; + cap &= ~IEEE80211_HT_CAP_SGI_40; + } + + switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { + case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: + if (flags & IEEE80211_CHAN_NO_HT40PLUS) { + 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_HT40MINUS) { + cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; + cap &= ~IEEE80211_HT_CAP_SGI_40; + } + break; + } + + /* set SM PS mode properly */ + cap &= ~IEEE80211_HT_CAP_SM_PS; + switch (smps) { + case IEEE80211_SMPS_AUTOMATIC: + case IEEE80211_SMPS_NUM_MODES: + WARN_ON(1); + case IEEE80211_SMPS_OFF: + cap |= WLAN_HT_CAP_SM_PS_DISABLED << + IEEE80211_HT_CAP_SM_PS_SHIFT; + break; + case IEEE80211_SMPS_STATIC: + cap |= WLAN_HT_CAP_SM_PS_STATIC << + IEEE80211_HT_CAP_SM_PS_SHIFT; + break; + case IEEE80211_SMPS_DYNAMIC: + cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << + IEEE80211_HT_CAP_SM_PS_SHIFT; + break; + } + + /* reserve and fill IE */ + + 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)); + + /* capability flags */ + tmp = cpu_to_le16(cap); + memcpy(pos, &tmp, sizeof(u16)); + pos += sizeof(u16); + + /* AMPDU parameters */ + *pos++ = sband->ht_cap.ampdu_factor | + (sband->ht_cap.ampdu_density << + IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT); + + /* MCS set */ + memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs)); + pos += sizeof(sband->ht_cap.mcs); + + /* extended capabilities */ + pos += sizeof(__le16); + + /* BF capabilities */ + pos += sizeof(__le32); + + /* antenna selection */ + pos += sizeof(u8); +} + +static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, + struct ieee80211_work *wk) +{ + struct ieee80211_local *local = sdata->local; + struct sk_buff *skb; + struct ieee80211_mgmt *mgmt; + u8 *pos, qos_info; + const u8 *ies; + size_t offset = 0, noffset; + int i, len, count, rates_len, supp_rates_len; + u16 capab; + struct ieee80211_supported_band *sband; + u32 rates = 0; + + sband = local->hw.wiphy->bands[wk->chan->band]; + + /* + * 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(wk->assoc.supp_rates, + wk->assoc.supp_rates_len, + sband, &rates); + + skb = alloc_skb(local->hw.extra_tx_headroom + + sizeof(*mgmt) + /* bit too much but doesn't matter */ + 2 + wk->assoc.ssid_len + /* SSID */ + 4 + rates_len + /* (extended) rates */ + 4 + /* power capability */ + 2 + 2 * sband->n_channels + /* supported channels */ + 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ + wk->ie_len + /* extra IEs */ + 9, /* WMM */ + GFP_KERNEL); + if (!skb) { + printk(KERN_DEBUG "%s: failed to allocate buffer for assoc " + "frame\n", sdata->name); + return; + } + skb_reserve(skb, local->hw.extra_tx_headroom); + + capab = WLAN_CAPABILITY_ESS; + + if (sband->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; + } + + if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY) + capab |= WLAN_CAPABILITY_PRIVACY; + + if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && + (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) + capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; + + mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); + memset(mgmt, 0, 24); + memcpy(mgmt->da, wk->filter_ta, ETH_ALEN); + memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); + memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN); + + if (!is_zero_ether_addr(wk->assoc.prev_bssid)) { + 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, wk->assoc.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 + wk->assoc.ssid_len); + *pos++ = WLAN_EID_SSID; + *pos++ = wk->assoc.ssid_len; + memcpy(pos, wk->assoc.ssid, wk->assoc.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++ = wk->chan->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 present, add any custom IEs that go before HT */ + if (wk->ie_len && wk->ie) { + static const u8 before_ht[] = { + WLAN_EID_SSID, + WLAN_EID_SUPP_RATES, + WLAN_EID_EXT_SUPP_RATES, + WLAN_EID_PWR_CAPABILITY, + WLAN_EID_SUPPORTED_CHANNELS, + WLAN_EID_RSN, + WLAN_EID_QOS_CAPA, + WLAN_EID_RRM_ENABLED_CAPABILITIES, + WLAN_EID_MOBILITY_DOMAIN, + WLAN_EID_SUPPORTED_REGULATORY_CLASSES, + }; + noffset = ieee80211_ie_split(wk->ie, wk->ie_len, + before_ht, ARRAY_SIZE(before_ht), + offset); + pos = skb_put(skb, noffset - offset); + memcpy(pos, wk->ie + offset, noffset - offset); + offset = noffset; + } + + if (wk->assoc.use_11n && wk->assoc.wmm_used && + local->hw.queues >= 4) + ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie, + sband, wk->chan, wk->assoc.smps); + + /* if present, add any custom non-vendor IEs that go after HT */ + if (wk->ie_len && wk->ie) { + noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len, + offset); + pos = skb_put(skb, noffset - offset); + memcpy(pos, wk->ie + offset, noffset - offset); + offset = noffset; + } + + if (wk->assoc.wmm_used && local->hw.queues >= 4) { + if (wk->assoc.uapsd_used) { + qos_info = local->uapsd_queues; + qos_info |= (local->uapsd_max_sp_len << + IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); + } else { + qos_info = 0; + } + + 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++ = qos_info; + } + + /* add any remaining custom (i.e. vendor specific here) IEs */ + if (wk->ie_len && wk->ie) { + noffset = wk->ie_len; + pos = skb_put(skb, noffset - offset); + memcpy(pos, wk->ie + offset, noffset - offset); + } + + IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; + ieee80211_tx_skb(sdata, skb); +} + +static void ieee80211_remove_auth_bss(struct ieee80211_local *local, + struct ieee80211_work *wk) +{ + struct cfg80211_bss *cbss; + u16 capa_val = WLAN_CAPABILITY_ESS; + + if (wk->probe_auth.privacy) + capa_val |= WLAN_CAPABILITY_PRIVACY; + + cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta, + wk->probe_auth.ssid, wk->probe_auth.ssid_len, + WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY, + capa_val); + if (!cbss) + return; + + cfg80211_unlink_bss(local->hw.wiphy, cbss); + cfg80211_put_bss(cbss); +} + +static enum work_action __must_check +ieee80211_direct_probe(struct ieee80211_work *wk) +{ + struct ieee80211_sub_if_data *sdata = wk->sdata; + struct ieee80211_local *local = sdata->local; + + wk->probe_auth.tries++; + if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) { + printk(KERN_DEBUG "%s: direct probe to %pM timed out\n", + sdata->name, wk->filter_ta); + + /* + * Most likely AP is not in the range so remove the + * bss struct for that AP. + */ + ieee80211_remove_auth_bss(local, wk); + + return WORK_ACT_TIMEOUT; + } + + printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n", + sdata->name, wk->filter_ta, wk->probe_auth.tries); + + /* + * 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, wk->probe_auth.ssid, + wk->probe_auth.ssid_len, NULL, 0); + + wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; + run_again(local, wk->timeout); + + return WORK_ACT_NONE; +} + + +static enum work_action __must_check +ieee80211_authenticate(struct ieee80211_work *wk) +{ + struct ieee80211_sub_if_data *sdata = wk->sdata; + struct ieee80211_local *local = sdata->local; + + wk->probe_auth.tries++; + if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) { + printk(KERN_DEBUG "%s: authentication with %pM" + " timed out\n", sdata->name, wk->filter_ta); + + /* + * Most likely AP is not in the range so remove the + * bss struct for that AP. + */ + ieee80211_remove_auth_bss(local, wk); + + return WORK_ACT_TIMEOUT; + } + + printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n", + sdata->name, wk->filter_ta, wk->probe_auth.tries); + + ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie, + wk->ie_len, wk->filter_ta, NULL, 0, 0); + wk->probe_auth.transaction = 2; + + wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; + run_again(local, wk->timeout); + + return WORK_ACT_NONE; +} + +static enum work_action __must_check +ieee80211_associate(struct ieee80211_work *wk) +{ + struct ieee80211_sub_if_data *sdata = wk->sdata; + struct ieee80211_local *local = sdata->local; + + wk->assoc.tries++; + if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) { + printk(KERN_DEBUG "%s: association with %pM" + " timed out\n", + sdata->name, wk->filter_ta); + + /* + * Most likely AP is not in the range so remove the + * bss struct for that AP. + */ + if (wk->assoc.bss) + cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss); + + return WORK_ACT_TIMEOUT; + } + + printk(KERN_DEBUG "%s: associate with %pM (try %d)\n", + sdata->name, wk->filter_ta, wk->assoc.tries); + ieee80211_send_assoc(sdata, wk); + + wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; + run_again(local, wk->timeout); + + return WORK_ACT_NONE; +} + +static enum work_action __must_check +ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk) +{ + /* + * First time we run, do nothing -- the generic code will + * have switched to the right channel etc. + */ + if (!wk->started) { + wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration); + + cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk, + wk->chan, wk->chan_type, + wk->remain.duration, GFP_KERNEL); + + return WORK_ACT_NONE; + } + + return WORK_ACT_TIMEOUT; +} + +static void ieee80211_auth_challenge(struct ieee80211_work *wk, + struct ieee80211_mgmt *mgmt, + size_t len) +{ + struct ieee80211_sub_if_data *sdata = wk->sdata; + 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, 3, wk->probe_auth.algorithm, + elems.challenge - 2, elems.challenge_len + 2, + wk->filter_ta, wk->probe_auth.key, + wk->probe_auth.key_len, wk->probe_auth.key_idx); + wk->probe_auth.transaction = 4; +} + +static enum work_action __must_check +ieee80211_rx_mgmt_auth(struct ieee80211_work *wk, + struct ieee80211_mgmt *mgmt, size_t len) +{ + u16 auth_alg, auth_transaction, status_code; + + if (wk->type != IEEE80211_WORK_AUTH) + return WORK_ACT_NONE; + + if (len < 24 + 6) + return WORK_ACT_NONE; + + 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 (auth_alg != wk->probe_auth.algorithm || + auth_transaction != wk->probe_auth.transaction) + return WORK_ACT_NONE; + + if (status_code != WLAN_STATUS_SUCCESS) { + printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n", + wk->sdata->name, mgmt->sa, status_code); + return WORK_ACT_DONE; + } + + switch (wk->probe_auth.algorithm) { + case WLAN_AUTH_OPEN: + case WLAN_AUTH_LEAP: + case WLAN_AUTH_FT: + break; + case WLAN_AUTH_SHARED_KEY: + if (wk->probe_auth.transaction != 4) { + ieee80211_auth_challenge(wk, mgmt, len); + /* need another frame */ + return WORK_ACT_NONE; + } + break; + default: + WARN_ON(1); + return WORK_ACT_NONE; + } + + printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name); + return WORK_ACT_DONE; +} + +static enum work_action __must_check +ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk, + struct ieee80211_mgmt *mgmt, size_t len, + bool reassoc) +{ + struct ieee80211_sub_if_data *sdata = wk->sdata; + struct ieee80211_local *local = sdata->local; + u16 capab_info, status_code, aid; + struct ieee802_11_elems elems; + u8 *pos; + + /* + * AssocResp and ReassocResp have identical structure, so process both + * of them in this function. + */ + + if (len < 24 + 6) + return WORK_ACT_NONE; + + 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->name, reassoc ? "Rea" : "A", mgmt->sa, + capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); + + pos = mgmt->u.assoc_resp.variable; + ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); + + if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && + elems.timeout_int && elems.timeout_int_len == 5 && + elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) { + u32 tu, ms; + tu = get_unaligned_le32(elems.timeout_int + 1); + ms = tu * 1024 / 1000; + printk(KERN_DEBUG "%s: %pM rejected association temporarily; " + "comeback duration %u TU (%u ms)\n", + sdata->name, mgmt->sa, tu, ms); + wk->timeout = jiffies + msecs_to_jiffies(ms); + if (ms > IEEE80211_ASSOC_TIMEOUT) + run_again(local, wk->timeout); + return WORK_ACT_NONE; + } + + if (status_code != WLAN_STATUS_SUCCESS) + printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n", + sdata->name, mgmt->sa, status_code); + else + printk(KERN_DEBUG "%s: associated\n", sdata->name); + + return WORK_ACT_DONE; +} + +static enum work_action __must_check +ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk, + struct ieee80211_mgmt *mgmt, size_t len, + struct ieee80211_rx_status *rx_status) +{ + struct ieee80211_sub_if_data *sdata = wk->sdata; + struct ieee80211_local *local = sdata->local; + size_t baselen; + + ASSERT_WORK_MTX(local); + + baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; + if (baselen > len) + return WORK_ACT_NONE; + + printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name); + return WORK_ACT_DONE; +} + +static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local, + struct sk_buff *skb) +{ + struct ieee80211_rx_status *rx_status; + struct ieee80211_mgmt *mgmt; + struct ieee80211_work *wk; + enum work_action rma = WORK_ACT_NONE; + u16 fc; + + rx_status = (struct ieee80211_rx_status *) skb->cb; + mgmt = (struct ieee80211_mgmt *) skb->data; + fc = le16_to_cpu(mgmt->frame_control); + + mutex_lock(&local->work_mtx); + + list_for_each_entry(wk, &local->work_list, list) { + const u8 *bssid = NULL; + + switch (wk->type) { + case IEEE80211_WORK_DIRECT_PROBE: + case IEEE80211_WORK_AUTH: + case IEEE80211_WORK_ASSOC: + bssid = wk->filter_ta; + break; + default: + continue; + } + + /* + * Before queuing, we already verified mgmt->sa, + * so this is needed just for matching. + */ + if (compare_ether_addr(bssid, mgmt->bssid)) + continue; + + switch (fc & IEEE80211_FCTL_STYPE) { + case IEEE80211_STYPE_PROBE_RESP: + rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len, + rx_status); + break; + case IEEE80211_STYPE_AUTH: + rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len); + break; + case IEEE80211_STYPE_ASSOC_RESP: + rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt, + skb->len, false); + break; + case IEEE80211_STYPE_REASSOC_RESP: + rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt, + skb->len, true); + break; + default: + WARN_ON(1); + } + /* + * We've processed this frame for that work, so it can't + * belong to another work struct. + * NB: this is also required for correctness for 'rma'! + */ + break; + } + + switch (rma) { + case WORK_ACT_NONE: + break; + case WORK_ACT_DONE: + list_del_rcu(&wk->list); + break; + default: + WARN(1, "unexpected: %d", rma); + } + + mutex_unlock(&local->work_mtx); + + if (rma != WORK_ACT_DONE) + goto out; + + switch (wk->done(wk, skb)) { + case WORK_DONE_DESTROY: + free_work(wk); + break; + case WORK_DONE_REQUEUE: + synchronize_rcu(); + wk->started = false; /* restart */ + mutex_lock(&local->work_mtx); + list_add_tail(&wk->list, &local->work_list); + mutex_unlock(&local->work_mtx); + } + + out: + kfree_skb(skb); +} + +static void ieee80211_work_timer(unsigned long data) +{ + struct ieee80211_local *local = (void *) data; + + if (local->quiescing) + return; + + ieee80211_queue_work(&local->hw, &local->work_work); +} + +static void ieee80211_work_work(struct work_struct *work) +{ + struct ieee80211_local *local = + container_of(work, struct ieee80211_local, work_work); + struct sk_buff *skb; + struct ieee80211_work *wk, *tmp; + LIST_HEAD(free_work); + enum work_action rma; + bool remain_off_channel = false; + + if (local->scanning) + return; + + /* + * ieee80211_queue_work() should have picked up most cases, + * here we'll pick the the rest. + */ + if (WARN(local->suspended, "work scheduled while going to suspend\n")) + return; + + /* first process frames to avoid timing out while a frame is pending */ + while ((skb = skb_dequeue(&local->work_skb_queue))) + ieee80211_work_rx_queued_mgmt(local, skb); + + ieee80211_recalc_idle(local); + + mutex_lock(&local->work_mtx); + + list_for_each_entry_safe(wk, tmp, &local->work_list, list) { + bool started = wk->started; + + /* mark work as started if it's on the current off-channel */ + if (!started && local->tmp_channel && + wk->chan == local->tmp_channel && + wk->chan_type == local->tmp_channel_type) { + started = true; + wk->timeout = jiffies; + } + + if (!started && !local->tmp_channel) { + /* + * TODO: could optimize this by leaving the + * station vifs in awake mode if they + * happen to be on the same channel as + * the requested channel + */ + ieee80211_offchannel_stop_beaconing(local); + ieee80211_offchannel_stop_station(local); + + local->tmp_channel = wk->chan; + local->tmp_channel_type = wk->chan_type; + ieee80211_hw_config(local, 0); + started = true; + wk->timeout = jiffies; + } + + /* don't try to work with items that aren't started */ + if (!started) + continue; + + if (time_is_after_jiffies(wk->timeout)) { + /* + * This work item isn't supposed to be worked on + * right now, but take care to adjust the timer + * properly. + */ + run_again(local, wk->timeout); + continue; + } + + switch (wk->type) { + default: + WARN_ON(1); + /* nothing */ + rma = WORK_ACT_NONE; + break; + case IEEE80211_WORK_ABORT: + rma = WORK_ACT_TIMEOUT; + break; + case IEEE80211_WORK_DIRECT_PROBE: + rma = ieee80211_direct_probe(wk); + break; + case IEEE80211_WORK_AUTH: + rma = ieee80211_authenticate(wk); + break; + case IEEE80211_WORK_ASSOC: + rma = ieee80211_associate(wk); + break; + case IEEE80211_WORK_REMAIN_ON_CHANNEL: + rma = ieee80211_remain_on_channel_timeout(wk); + break; + } + + wk->started = started; + + switch (rma) { + case WORK_ACT_NONE: + /* might have changed the timeout */ + run_again(local, wk->timeout); + break; + case WORK_ACT_TIMEOUT: + list_del_rcu(&wk->list); + synchronize_rcu(); + list_add(&wk->list, &free_work); + break; + default: + WARN(1, "unexpected: %d", rma); + } + } + + list_for_each_entry(wk, &local->work_list, list) { + if (!wk->started) + continue; + if (wk->chan != local->tmp_channel) + continue; + if (wk->chan_type != local->tmp_channel_type) + continue; + remain_off_channel = true; + } + + if (!remain_off_channel && local->tmp_channel) { + local->tmp_channel = NULL; + ieee80211_hw_config(local, 0); + ieee80211_offchannel_return(local, true); + /* give connection some time to breathe */ + run_again(local, jiffies + HZ/2); + } + + if (list_empty(&local->work_list) && local->scan_req) + ieee80211_queue_delayed_work(&local->hw, + &local->scan_work, + round_jiffies_relative(0)); + + mutex_unlock(&local->work_mtx); + + ieee80211_recalc_idle(local); + + list_for_each_entry_safe(wk, tmp, &free_work, list) { + wk->done(wk, NULL); + list_del(&wk->list); + kfree(wk); + } +} + +void ieee80211_add_work(struct ieee80211_work *wk) +{ + struct ieee80211_local *local; + + if (WARN_ON(!wk->chan)) + return; + + if (WARN_ON(!wk->sdata)) + return; + + if (WARN_ON(!wk->done)) + return; + + if (WARN_ON(!ieee80211_sdata_running(wk->sdata))) + return; + + wk->started = false; + + local = wk->sdata->local; + mutex_lock(&local->work_mtx); + list_add_tail(&wk->list, &local->work_list); + mutex_unlock(&local->work_mtx); + + ieee80211_queue_work(&local->hw, &local->work_work); +} + +void ieee80211_work_init(struct ieee80211_local *local) +{ + mutex_init(&local->work_mtx); + INIT_LIST_HEAD(&local->work_list); + setup_timer(&local->work_timer, ieee80211_work_timer, + (unsigned long)local); + INIT_WORK(&local->work_work, ieee80211_work_work); + skb_queue_head_init(&local->work_skb_queue); +} + +void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_work *wk; + + mutex_lock(&local->work_mtx); + list_for_each_entry(wk, &local->work_list, list) { + if (wk->sdata != sdata) + continue; + wk->type = IEEE80211_WORK_ABORT; + wk->started = true; + wk->timeout = jiffies; + } + mutex_unlock(&local->work_mtx); + + /* run cleanups etc. */ + ieee80211_work_work(&local->work_work); + + mutex_lock(&local->work_mtx); + list_for_each_entry(wk, &local->work_list, list) { + if (wk->sdata != sdata) + continue; + WARN_ON(1); + break; + } + mutex_unlock(&local->work_mtx); +} + +ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata, + struct sk_buff *skb) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_mgmt *mgmt; + struct ieee80211_work *wk; + u16 fc; + + if (skb->len < 24) + return RX_DROP_MONITOR; + + mgmt = (struct ieee80211_mgmt *) skb->data; + fc = le16_to_cpu(mgmt->frame_control); + + list_for_each_entry_rcu(wk, &local->work_list, list) { + if (sdata != wk->sdata) + continue; + if (compare_ether_addr(wk->filter_ta, mgmt->sa)) + continue; + if (compare_ether_addr(wk->filter_ta, mgmt->bssid)) + continue; + + switch (fc & IEEE80211_FCTL_STYPE) { + case IEEE80211_STYPE_AUTH: + case IEEE80211_STYPE_PROBE_RESP: + case IEEE80211_STYPE_ASSOC_RESP: + case IEEE80211_STYPE_REASSOC_RESP: + skb_queue_tail(&local->work_skb_queue, skb); + ieee80211_queue_work(&local->hw, &local->work_work); + return RX_QUEUED; + } + } + + return RX_CONTINUE; +} + +static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk, + struct sk_buff *skb) +{ + /* + * We are done serving the remain-on-channel command. + */ + cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk, + wk->chan, wk->chan_type, + GFP_KERNEL); + + return WORK_DONE_DESTROY; +} + +int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata, + struct ieee80211_channel *chan, + enum nl80211_channel_type channel_type, + unsigned int duration, u64 *cookie) +{ + struct ieee80211_work *wk; + + wk = kzalloc(sizeof(*wk), GFP_KERNEL); + if (!wk) + return -ENOMEM; + + wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL; + wk->chan = chan; + wk->chan_type = channel_type; + wk->sdata = sdata; + wk->done = ieee80211_remain_done; + + wk->remain.duration = duration; + + *cookie = (unsigned long) wk; + + ieee80211_add_work(wk); + + return 0; +} + +int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata, + u64 cookie) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_work *wk, *tmp; + bool found = false; + + mutex_lock(&local->work_mtx); + list_for_each_entry_safe(wk, tmp, &local->work_list, list) { + if ((unsigned long) wk == cookie) { + wk->timeout = jiffies; + found = true; + break; + } + } + mutex_unlock(&local->work_mtx); + + if (!found) + return -ENOENT; + + ieee80211_queue_work(&local->hw, &local->work_work); + + return 0; +} |
