diff options
-rw-r--r-- | include/net/ieee80211softmac.h | 52 | ||||
-rw-r--r-- | net/ieee80211/softmac/ieee80211softmac_assoc.c | 21 | ||||
-rw-r--r-- | net/ieee80211/softmac/ieee80211softmac_io.c | 14 | ||||
-rw-r--r-- | net/ieee80211/softmac/ieee80211softmac_module.c | 78 | ||||
-rw-r--r-- | net/ieee80211/softmac/ieee80211softmac_priv.h | 8 |
5 files changed, 142 insertions, 31 deletions
diff --git a/include/net/ieee80211softmac.h b/include/net/ieee80211softmac.h index 00ad810eb88..c27d03433c2 100644 --- a/include/net/ieee80211softmac.h +++ b/include/net/ieee80211softmac.h @@ -86,9 +86,6 @@ struct ieee80211softmac_assoc_info { /* BSSID we're trying to associate to */ char bssid[ETH_ALEN]; - - /* Rates supported by the network */ - struct ieee80211softmac_ratesinfo supported_rates; /* some flags. * static_essid is valid if the essid is constant, @@ -103,6 +100,7 @@ struct ieee80211softmac_assoc_info { * bssfixed is used for SIOCSIWAP. */ u8 static_essid:1, + short_preamble_available:1, associating:1, assoc_wait:1, bssvalid:1, @@ -115,6 +113,19 @@ struct ieee80211softmac_assoc_info { struct work_struct timeout; }; +struct ieee80211softmac_bss_info { + /* Rates supported by the network */ + struct ieee80211softmac_ratesinfo supported_rates; + + /* This indicates whether frames can currently be transmitted with + * short preamble (only use this variable during TX at CCK rates) */ + u8 short_preamble:1; + + /* This indicates whether protection (e.g. self-CTS) should be used + * when transmitting with OFDM modulation */ + u8 use_protection:1; +}; + enum { IEEE80211SOFTMAC_AUTH_OPEN_REQUEST = 1, IEEE80211SOFTMAC_AUTH_OPEN_RESPONSE = 2, @@ -157,6 +168,10 @@ struct ieee80211softmac_txrates { #define IEEE80211SOFTMAC_TXRATECHG_MCAST (1 << 2) /* mcast_rate */ #define IEEE80211SOFTMAC_TXRATECHG_MGT_MCAST (1 << 3) /* mgt_mcast_rate */ +#define IEEE80211SOFTMAC_BSSINFOCHG_RATES (1 << 0) /* supported_rates */ +#define IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE (1 << 1) /* short_preamble */ +#define IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION (1 << 2) /* use_protection */ + struct ieee80211softmac_device { /* 802.11 structure for data stuff */ struct ieee80211_device *ieee; @@ -200,10 +215,16 @@ struct ieee80211softmac_device { * The driver just needs to read them. */ struct ieee80211softmac_txrates txrates; - /* If the driver needs to do stuff on TX rate changes, assign this callback. */ + + /* If the driver needs to do stuff on TX rate changes, assign this + * callback. See IEEE80211SOFTMAC_TXRATECHG for change flags. */ void (*txrates_change)(struct net_device *dev, - u32 changes, /* see IEEE80211SOFTMAC_TXRATECHG flags */ - const struct ieee80211softmac_txrates *rates_before_change); + u32 changes); + + /* If the driver needs to do stuff when BSS properties change, assign + * this callback. see IEEE80211SOFTMAC_BSSINFOCHG for change flags. */ + void (*bssinfo_change)(struct net_device *dev, + u32 changes); /* private stuff follows */ /* this lock protects this structure */ @@ -216,6 +237,7 @@ struct ieee80211softmac_device { struct ieee80211softmac_scaninfo *scaninfo; struct ieee80211softmac_assoc_info associnfo; + struct ieee80211softmac_bss_info bssinfo; struct list_head auth_queue; struct list_head events; @@ -279,6 +301,24 @@ static inline u8 ieee80211softmac_suggest_txrate(struct ieee80211softmac_device return txrates->mcast_rate; } +/* Helper function which advises you when it is safe to transmit with short + * preamble. + * You should only call this function when transmitting at CCK rates. */ +static inline int ieee80211softmac_short_preamble_ok(struct ieee80211softmac_device *mac, + int is_multicast, + int is_mgt) +{ + return (is_multicast && is_mgt) ? 0 : mac->bssinfo.short_preamble; +} + +/* Helper function which advises you whether protection (e.g. self-CTS) is + * needed. 1 = protection needed, 0 = no protection needed + * Only use this function when transmitting with OFDM modulation. */ +static inline int ieee80211softmac_protection_needed(struct ieee80211softmac_device *mac) +{ + return mac->bssinfo.use_protection; +} + /* Start the SoftMAC. Call this after you initialized the device * and it is ready to run. */ diff --git a/net/ieee80211/softmac/ieee80211softmac_assoc.c b/net/ieee80211/softmac/ieee80211softmac_assoc.c index 44215ce64d4..589f6d2c548 100644 --- a/net/ieee80211/softmac/ieee80211softmac_assoc.c +++ b/net/ieee80211/softmac/ieee80211softmac_assoc.c @@ -96,7 +96,7 @@ ieee80211softmac_disassoc(struct ieee80211softmac_device *mac) mac->associated = 0; mac->associnfo.bssvalid = 0; mac->associnfo.associating = 0; - ieee80211softmac_init_txrates(mac); + ieee80211softmac_init_bss(mac); ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_DISASSOCIATED, NULL); spin_unlock_irqrestore(&mac->lock, flags); } @@ -334,11 +334,19 @@ ieee80211softmac_associated(struct ieee80211softmac_device *mac, struct ieee80211_assoc_response * resp, struct ieee80211softmac_network *net) { + u16 cap = le16_to_cpu(resp->capability); + u8 erp_value = net->erp_value; + mac->associnfo.associating = 0; - mac->associnfo.supported_rates = net->supported_rates; + mac->bssinfo.supported_rates = net->supported_rates; ieee80211softmac_recalc_txrates(mac); mac->associated = 1; + + mac->associnfo.short_preamble_available = + (cap & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0; + ieee80211softmac_process_erp(mac, erp_value); + if (mac->set_bssid_filter) mac->set_bssid_filter(mac->dev, net->bssid); memcpy(mac->ieee->bssid, net->bssid, ETH_ALEN); @@ -351,9 +359,9 @@ ieee80211softmac_associated(struct ieee80211softmac_device *mac, int ieee80211softmac_handle_assoc_response(struct net_device * dev, struct ieee80211_assoc_response * resp, - struct ieee80211_network * _ieee80211_network_do_not_use) + struct ieee80211_network * _ieee80211_network) { - /* NOTE: the network parameter has to be ignored by + /* NOTE: the network parameter has to be mostly ignored by * this code because it is the ieee80211's pointer * to the struct, not ours (we made a copy) */ @@ -385,6 +393,11 @@ ieee80211softmac_handle_assoc_response(struct net_device * dev, /* now that we know it was for us, we can cancel the timeout */ cancel_delayed_work(&mac->associnfo.timeout); + /* if the association response included an ERP IE, update our saved + * copy */ + if (_ieee80211_network->flags & NETWORK_HAS_ERP_VALUE) + network->erp_value = _ieee80211_network->erp_value; + switch (status) { case 0: dprintk(KERN_INFO PFX "associated!\n"); diff --git a/net/ieee80211/softmac/ieee80211softmac_io.c b/net/ieee80211/softmac/ieee80211softmac_io.c index 6ae5a1dc795..82bfddbf33a 100644 --- a/net/ieee80211/softmac/ieee80211softmac_io.c +++ b/net/ieee80211/softmac/ieee80211softmac_io.c @@ -467,3 +467,17 @@ ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac, kfree(pkt); return 0; } + +/* Beacon handling */ +int ieee80211softmac_handle_beacon(struct net_device *dev, + struct ieee80211_beacon *beacon, + struct ieee80211_network *network) +{ + struct ieee80211softmac_device *mac = ieee80211_priv(dev); + + if (mac->associated && memcmp(network->bssid, mac->associnfo.bssid, ETH_ALEN) == 0) + ieee80211softmac_process_erp(mac, network->erp_value); + + return 0; +} + diff --git a/net/ieee80211/softmac/ieee80211softmac_module.c b/net/ieee80211/softmac/ieee80211softmac_module.c index 4b2e57d1241..c275646b226 100644 --- a/net/ieee80211/softmac/ieee80211softmac_module.c +++ b/net/ieee80211/softmac/ieee80211softmac_module.c @@ -44,6 +44,7 @@ struct net_device *alloc_ieee80211softmac(int sizeof_priv) softmac->ieee->handle_assoc_response = ieee80211softmac_handle_assoc_response; softmac->ieee->handle_reassoc_request = ieee80211softmac_handle_reassoc_req; softmac->ieee->handle_disassoc = ieee80211softmac_handle_disassoc; + softmac->ieee->handle_beacon = ieee80211softmac_handle_beacon; softmac->scaninfo = NULL; softmac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT; @@ -209,35 +210,59 @@ static u8 highest_supported_rate(struct ieee80211softmac_device *mac, return user_rate; } +void ieee80211softmac_process_erp(struct ieee80211softmac_device *mac, + u8 erp_value) +{ + int use_protection; + int short_preamble; + u32 changes = 0; + + /* Barker preamble mode */ + short_preamble = ((erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0 + && mac->associnfo.short_preamble_available) ? 1 : 0; + + /* Protection needed? */ + use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0; + + if (mac->bssinfo.short_preamble != short_preamble) { + changes |= IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE; + mac->bssinfo.short_preamble = short_preamble; + } + + if (mac->bssinfo.use_protection != use_protection) { + changes |= IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION; + mac->bssinfo.use_protection = use_protection; + } + + if (mac->bssinfo_change && changes) + mac->bssinfo_change(mac->dev, changes); +} + void ieee80211softmac_recalc_txrates(struct ieee80211softmac_device *mac) { struct ieee80211softmac_txrates *txrates = &mac->txrates; - struct ieee80211softmac_txrates oldrates; u32 change = 0; - if (mac->txrates_change) - oldrates = mac->txrates; - change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT; - txrates->default_rate = highest_supported_rate(mac, &mac->associnfo.supported_rates, 0); + txrates->default_rate = highest_supported_rate(mac, &mac->bssinfo.supported_rates, 0); change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK; txrates->default_fallback = lower_rate(mac, txrates->default_rate); change |= IEEE80211SOFTMAC_TXRATECHG_MCAST; - txrates->mcast_rate = highest_supported_rate(mac, &mac->associnfo.supported_rates, 1); + txrates->mcast_rate = highest_supported_rate(mac, &mac->bssinfo.supported_rates, 1); if (mac->txrates_change) - mac->txrates_change(mac->dev, change, &oldrates); + mac->txrates_change(mac->dev, change); } -void ieee80211softmac_init_txrates(struct ieee80211softmac_device *mac) +void ieee80211softmac_init_bss(struct ieee80211softmac_device *mac) { struct ieee80211_device *ieee = mac->ieee; u32 change = 0; struct ieee80211softmac_txrates *txrates = &mac->txrates; - struct ieee80211softmac_txrates oldrates; + struct ieee80211softmac_bss_info *bssinfo = &mac->bssinfo; /* TODO: We need some kind of state machine to lower the default rates * if we loose too many packets. @@ -245,8 +270,6 @@ void ieee80211softmac_init_txrates(struct ieee80211softmac_device *mac) /* Change the default txrate to the highest possible value. * The txrate machine will lower it, if it is too high. */ - if (mac->txrates_change) - oldrates = mac->txrates; /* FIXME: We don't correctly handle backing down to lower rates, so 801.11g devices start off at 11M for now. People can manually change it if they really need to, but 11M is @@ -272,7 +295,23 @@ void ieee80211softmac_init_txrates(struct ieee80211softmac_device *mac) change |= IEEE80211SOFTMAC_TXRATECHG_MGT_MCAST; if (mac->txrates_change) - mac->txrates_change(mac->dev, change, &oldrates); + mac->txrates_change(mac->dev, change); + + change = 0; + + bssinfo->supported_rates.count = 0; + memset(bssinfo->supported_rates.rates, 0, + sizeof(bssinfo->supported_rates.rates)); + change |= IEEE80211SOFTMAC_BSSINFOCHG_RATES; + + bssinfo->short_preamble = 0; + change |= IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE; + + bssinfo->use_protection = 0; + change |= IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION; + + if (mac->bssinfo_change) + mac->bssinfo_change(mac->dev, change); mac->running = 1; } @@ -282,7 +321,7 @@ void ieee80211softmac_start(struct net_device *dev) struct ieee80211softmac_device *mac = ieee80211_priv(dev); ieee80211softmac_start_check_rates(mac); - ieee80211softmac_init_txrates(mac); + ieee80211softmac_init_bss(mac); } EXPORT_SYMBOL_GPL(ieee80211softmac_start); @@ -335,7 +374,6 @@ u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rat static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac, int amount) { - struct ieee80211softmac_txrates oldrates; u8 default_rate = mac->txrates.default_rate; u8 default_fallback = mac->txrates.default_fallback; u32 changes = 0; @@ -348,8 +386,6 @@ printk("badness %d\n", mac->txrate_badness); mac->txrate_badness += amount; if (mac->txrate_badness <= -1000) { /* Very small badness. Try a faster bitrate. */ - if (mac->txrates_change) - memcpy(&oldrates, &mac->txrates, sizeof(oldrates)); default_rate = raise_rate(mac, default_rate); changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT; default_fallback = get_fallback_rate(mac, default_rate); @@ -358,8 +394,6 @@ printk("badness %d\n", mac->txrate_badness); printk("Bitrate raised to %u\n", default_rate); } else if (mac->txrate_badness >= 10000) { /* Very high badness. Try a slower bitrate. */ - if (mac->txrates_change) - memcpy(&oldrates, &mac->txrates, sizeof(oldrates)); default_rate = lower_rate(mac, default_rate); changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT; default_fallback = get_fallback_rate(mac, default_rate); @@ -372,7 +406,7 @@ printk("Bitrate lowered to %u\n", default_rate); mac->txrates.default_fallback = default_fallback; if (changes && mac->txrates_change) - mac->txrates_change(mac->dev, changes, &oldrates); + mac->txrates_change(mac->dev, changes); } void ieee80211softmac_fragment_lost(struct net_device *dev, @@ -416,7 +450,11 @@ ieee80211softmac_create_network(struct ieee80211softmac_device *mac, memcpy(&softnet->supported_rates.rates[softnet->supported_rates.count], net->rates_ex, net->rates_ex_len); softnet->supported_rates.count += net->rates_ex_len; sort(softnet->supported_rates.rates, softnet->supported_rates.count, sizeof(softnet->supported_rates.rates[0]), rate_cmp, NULL); - + + /* we save the ERP value because it is needed at association time, and + * many AP's do not include an ERP IE in the association response. */ + softnet->erp_value = net->erp_value; + softnet->capabilities = net->capability; return softnet; } diff --git a/net/ieee80211/softmac/ieee80211softmac_priv.h b/net/ieee80211/softmac/ieee80211softmac_priv.h index fa1f8e3acfc..0642e090b8a 100644 --- a/net/ieee80211/softmac/ieee80211softmac_priv.h +++ b/net/ieee80211/softmac/ieee80211softmac_priv.h @@ -116,9 +116,11 @@ ieee80211softmac_get_network_by_essid(struct ieee80211softmac_device *mac, struct ieee80211softmac_essid *essid); /* Rates related */ +void ieee80211softmac_process_erp(struct ieee80211softmac_device *mac, + u8 erp_value); int ieee80211softmac_ratesinfo_rate_supported(struct ieee80211softmac_ratesinfo *ri, u8 rate); u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta); -void ieee80211softmac_init_txrates(struct ieee80211softmac_device *mac); +void ieee80211softmac_init_bss(struct ieee80211softmac_device *mac); void ieee80211softmac_recalc_txrates(struct ieee80211softmac_device *mac); static inline u8 lower_rate(struct ieee80211softmac_device *mac, u8 rate) { return ieee80211softmac_lower_rate_delta(mac, rate, 1); @@ -133,6 +135,9 @@ static inline u8 get_fallback_rate(struct ieee80211softmac_device *mac, u8 rate) /*** prototypes from _io.c */ int ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac, void* ptrarg, u32 type, u32 arg); +int ieee80211softmac_handle_beacon(struct net_device *dev, + struct ieee80211_beacon *beacon, + struct ieee80211_network *network); /*** prototypes from _auth.c */ /* do these have to go into the public header? */ @@ -189,6 +194,7 @@ struct ieee80211softmac_network { authenticated:1, auth_desynced_once:1; + u8 erp_value; /* Saved ERP value */ u16 capabilities; /* Capabilities bitfield */ u8 challenge_len; /* Auth Challenge length */ char *challenge; /* Challenge Text */ |