forked from Minki/linux
366 lines
12 KiB
C
366 lines
12 KiB
C
#include "ieee80211softmac_priv.h"
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/*
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* Overview
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*
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* Before you can associate, you have to authenticate.
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*
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*/
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/* Sends out an association request to the desired AP */
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static void
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ieee80211softmac_assoc(struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
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{
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unsigned long flags;
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function_enter();
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/* Switch to correct channel for this network */
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mac->set_channel(mac->dev, net->channel);
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/* Send association request */
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ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_ASSOC_REQ, 0);
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dprintk(KERN_INFO PFX "sent association request!\n");
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/* Change the state to associating */
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spin_lock_irqsave(&mac->lock, flags);
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mac->associnfo.associating = 1;
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mac->associated = 0; /* just to make sure */
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spin_unlock_irqrestore(&mac->lock, flags);
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/* Set a timer for timeout */
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/* FIXME: make timeout configurable */
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schedule_delayed_work(&mac->associnfo.timeout, 5 * HZ);
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}
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void
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ieee80211softmac_assoc_timeout(void *d)
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{
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struct ieee80211softmac_device *mac = (struct ieee80211softmac_device *)d;
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unsigned long flags;
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function_enter();
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spin_lock_irqsave(&mac->lock, flags);
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/* we might race against ieee80211softmac_handle_assoc_response,
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* so make sure only one of us does something */
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if (!mac->associnfo.associating) {
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spin_unlock_irqrestore(&mac->lock, flags);
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return;
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}
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mac->associnfo.associating = 0;
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mac->associnfo.bssvalid = 0;
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mac->associated = 0;
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spin_unlock_irqrestore(&mac->lock, flags);
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dprintk(KERN_INFO PFX "assoc request timed out!\n");
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/* FIXME: we need to know the network here. that requires a bit of restructuring */
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ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT, NULL);
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}
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static void
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ieee80211softmac_reassoc(struct ieee80211softmac_device *mac)
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{
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function_enter();
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}
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/* Sends out a disassociation request to the desired AP */
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static void
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ieee80211softmac_disassoc(struct ieee80211softmac_device *mac, u16 reason)
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{
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unsigned long flags;
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struct ieee80211softmac_network *found;
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function_enter();
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if (mac->associnfo.bssvalid && mac->associated) {
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found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
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if (found)
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ieee80211softmac_send_mgt_frame(mac, found, IEEE80211_STYPE_DISASSOC, reason);
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} else if (mac->associnfo.associating) {
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cancel_delayed_work(&mac->associnfo.timeout);
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}
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/* Change our state */
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spin_lock_irqsave(&mac->lock, flags);
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/* Do NOT clear bssvalid as that will break ieee80211softmac_assoc_work! */
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mac->associated = 0;
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mac->associnfo.associating = 0;
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spin_unlock_irqrestore(&mac->lock, flags);
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}
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static inline int
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we_support_all_basic_rates(struct ieee80211softmac_device *mac, u8 *from, u8 from_len)
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{
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int idx, search, found;
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u8 rate, search_rate;
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for (idx = 0; idx < (from_len); idx++) {
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rate = (from)[idx];
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if (!(rate & IEEE80211_BASIC_RATE_MASK))
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continue;
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found = 0;
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rate &= ~IEEE80211_BASIC_RATE_MASK;
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for (search = 0; search < mac->ratesinfo.count; search++) {
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search_rate = mac->ratesinfo.rates[search];
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search_rate &= ~IEEE80211_BASIC_RATE_MASK;
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if (rate == search_rate) {
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found = 1;
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break;
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}
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}
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if (!found)
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return 0;
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}
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return 1;
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}
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static int
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network_matches_request(struct ieee80211softmac_device *mac, struct ieee80211_network *net)
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{
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/* we cannot associate to networks whose name we don't know */
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if (ieee80211_is_empty_essid(net->ssid, net->ssid_len))
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return 0;
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/* do not associate to a network whose BSSBasicRateSet we cannot support */
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if (!we_support_all_basic_rates(mac, net->rates, net->rates_len))
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return 0;
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/* do we really need to check the ex rates? */
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if (!we_support_all_basic_rates(mac, net->rates_ex, net->rates_ex_len))
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return 0;
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/* if 'ANY' network requested, take any that doesn't have privacy enabled */
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if (mac->associnfo.req_essid.len == 0
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&& !(net->capability & WLAN_CAPABILITY_PRIVACY))
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return 1;
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if (net->ssid_len != mac->associnfo.req_essid.len)
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return 0;
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if (!memcmp(net->ssid, mac->associnfo.req_essid.data, mac->associnfo.req_essid.len))
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return 1;
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return 0;
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}
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static void
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ieee80211softmac_assoc_notify(struct net_device *dev, void *context)
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{
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struct ieee80211softmac_device *mac = ieee80211_priv(dev);
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ieee80211softmac_assoc_work((void*)mac);
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}
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/* This function is called to handle userspace requests (asynchronously) */
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void
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ieee80211softmac_assoc_work(void *d)
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{
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struct ieee80211softmac_device *mac = (struct ieee80211softmac_device *)d;
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struct ieee80211softmac_network *found = NULL;
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struct ieee80211_network *net = NULL, *best = NULL;
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unsigned long flags;
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function_enter();
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/* meh */
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if (mac->associated)
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ieee80211softmac_disassoc(mac, WLAN_REASON_DISASSOC_STA_HAS_LEFT);
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/* try to find the requested network in our list, if we found one already */
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if (mac->associnfo.bssvalid)
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found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
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/* Search the ieee80211 networks for this network if we didn't find it */
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if (!found)
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{
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s8 rssi = -128; /* if I don't initialise, gcc emits an invalid warning
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because it cannot follow the best pointer logic. */
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spin_lock_irqsave(&mac->ieee->lock, flags);
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list_for_each_entry(net, &mac->ieee->network_list, list) {
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/* we're supposed to find the network with
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* the best signal here, as we're asked to join
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* any network with a specific ESSID, and many
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* different ones could have that.
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*
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* I'll for now just go with the reported rssi.
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*
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* We also should take into account the rateset
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* here to find the best BSSID to try.
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*/
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if (network_matches_request(mac, net)) {
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if (!best) {
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best = net;
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rssi = best->stats.rssi;
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continue;
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}
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/* we already had a matching network, so
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* compare their properties to get the
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* better of the two ... (see above)
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*/
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if (rssi < net->stats.rssi) {
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best = net;
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rssi = best->stats.rssi;
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}
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}
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}
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/* if we unlock here, we might get interrupted and the `best'
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* pointer could go stale */
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if (best) {
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found = ieee80211softmac_create_network(mac, best);
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/* if found is still NULL, then we got -ENOMEM somewhere */
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if (found)
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ieee80211softmac_add_network(mac, found);
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}
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spin_unlock_irqrestore(&mac->ieee->lock, flags);
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}
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if (!found) {
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if (mac->associnfo.scan_retry > 0) {
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spin_lock_irqsave(&mac->lock, flags);
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mac->associnfo.scan_retry--;
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spin_unlock_irqrestore(&mac->lock, flags);
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/* We know of no such network. Let's scan.
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* NB: this also happens if we had no memory to copy the network info...
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* Maybe we can hope to have more memory after scanning finishes ;)
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*/
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dprintk(KERN_INFO PFX "Associate: Network not known, trying to initiate scan: ");
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ieee80211softmac_notify(mac->dev, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, ieee80211softmac_assoc_notify, NULL);
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if (ieee80211softmac_start_scan(mac))
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dprintk("failed.\n");
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else
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dprintk("ok.\n");
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return;
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}
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else {
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spin_lock_irqsave(&mac->lock, flags);
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mac->associnfo.associating = 0;
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mac->associated = 0;
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spin_unlock_irqrestore(&mac->lock, flags);
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dprintk(KERN_INFO PFX "Unable to find network after scan!\n");
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ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND, NULL);
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return;
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}
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}
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mac->associnfo.bssvalid = 1;
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memcpy(mac->associnfo.bssid, found->bssid, ETH_ALEN);
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/* copy the ESSID for displaying it */
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mac->associnfo.associate_essid.len = found->essid.len;
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memcpy(mac->associnfo.associate_essid.data, found->essid.data, IW_ESSID_MAX_SIZE + 1);
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/* we found a network! authenticate (if necessary) and associate to it. */
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if (!found->authenticated) {
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/* This relies on the fact that _auth_req only queues the work,
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* otherwise adding the notification would be racy. */
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if (!ieee80211softmac_auth_req(mac, found)) {
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dprintk(KERN_INFO PFX "cannot associate without being authenticated, requested authentication\n");
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ieee80211softmac_notify_internal(mac, IEEE80211SOFTMAC_EVENT_ANY, found, ieee80211softmac_assoc_notify, NULL, GFP_KERNEL);
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} else {
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printkl(KERN_WARNING PFX "Not authenticated, but requesting authentication failed. Giving up to associate\n");
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ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, found);
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}
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return;
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}
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/* finally! now we can start associating */
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ieee80211softmac_assoc(mac, found);
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}
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/* call this to do whatever is necessary when we're associated */
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static void
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ieee80211softmac_associated(struct ieee80211softmac_device *mac,
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struct ieee80211_assoc_response * resp,
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struct ieee80211softmac_network *net)
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{
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mac->associnfo.associating = 0;
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mac->associated = 1;
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if (mac->set_bssid_filter)
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mac->set_bssid_filter(mac->dev, net->bssid);
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memcpy(mac->ieee->bssid, net->bssid, ETH_ALEN);
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netif_carrier_on(mac->dev);
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mac->association_id = le16_to_cpup(&resp->aid);
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}
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/* received frame handling functions */
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int
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ieee80211softmac_handle_assoc_response(struct net_device * dev,
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struct ieee80211_assoc_response * resp,
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struct ieee80211_network * _ieee80211_network_do_not_use)
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{
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/* NOTE: the network parameter has to be ignored by
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* this code because it is the ieee80211's pointer
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* to the struct, not ours (we made a copy)
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*/
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struct ieee80211softmac_device *mac = ieee80211_priv(dev);
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u16 status = le16_to_cpup(&resp->status);
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struct ieee80211softmac_network *network = NULL;
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unsigned long flags;
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spin_lock_irqsave(&mac->lock, flags);
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if (!mac->associnfo.associating) {
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/* we race against the timeout function, so make sure
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* only one of us can do work */
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spin_unlock_irqrestore(&mac->lock, flags);
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return 0;
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}
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network = ieee80211softmac_get_network_by_bssid_locked(mac, resp->header.addr3);
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/* someone sending us things without us knowing him? Ignore. */
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if (!network) {
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dprintk(KERN_INFO PFX "Received unrequested assocation response from " MAC_FMT "\n", MAC_ARG(resp->header.addr3));
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spin_unlock_irqrestore(&mac->lock, flags);
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return 0;
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}
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/* now that we know it was for us, we can cancel the timeout */
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cancel_delayed_work(&mac->associnfo.timeout);
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switch (status) {
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case 0:
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dprintk(KERN_INFO PFX "associated!\n");
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ieee80211softmac_associated(mac, resp, network);
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ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATED, network);
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break;
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case WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH:
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if (!network->auth_desynced_once) {
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/* there seem to be a few rare cases where our view of
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* the world is obscured, or buggy APs that don't DEAUTH
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* us properly. So we handle that, but allow it only once.
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*/
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printkl(KERN_INFO PFX "We were not authenticated during association, retrying...\n");
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network->authenticated = 0;
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/* we don't want to do this more than once ... */
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network->auth_desynced_once = 1;
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schedule_work(&mac->associnfo.work);
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break;
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}
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default:
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dprintk(KERN_INFO PFX "associating failed (reason: 0x%x)!\n", status);
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mac->associnfo.associating = 0;
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mac->associnfo.bssvalid = 0;
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mac->associated = 0;
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ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, network);
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}
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spin_unlock_irqrestore(&mac->lock, flags);
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return 0;
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}
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int
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ieee80211softmac_handle_disassoc(struct net_device * dev,
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struct ieee80211_disassoc *disassoc)
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{
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struct ieee80211softmac_device *mac = ieee80211_priv(dev);
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unsigned long flags;
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if (memcmp(disassoc->header.addr2, mac->associnfo.bssid, ETH_ALEN))
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return 0;
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if (memcmp(disassoc->header.addr1, mac->dev->dev_addr, ETH_ALEN))
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return 0;
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dprintk(KERN_INFO PFX "got disassoc frame\n");
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netif_carrier_off(dev);
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spin_lock_irqsave(&mac->lock, flags);
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mac->associnfo.bssvalid = 0;
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mac->associated = 0;
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schedule_work(&mac->associnfo.work);
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spin_unlock_irqrestore(&mac->lock, flags);
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return 0;
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}
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