[MAC80211]: Add mac80211 wireless stack.

Add mac80211, the IEEE 802.11 software MAC layer.

Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 344 insertions, 0 deletions

diff --git a/net/mac80211/ieee80211_iface.c b/net/mac80211/ieee80211_iface.c
new file mode 100644
index 000000000000..64267d4b31a4
--- /dev/null
+++ b/net/mac80211/ieee80211_iface.c
@@ -0,0 +1,344 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
+ *
+ * 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/kernel.h>
+#include <linux/if_arp.h>
+#include <linux/netdevice.h>
+#include <linux/rtnetlink.h>
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "sta_info.h"
+
+void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
+{
+        int i;
+
+        /* Default values for sub-interface parameters */
+        sdata->drop_unencrypted = 0;
+        sdata->eapol = 1;
+        for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
+                skb_queue_head_init(&sdata->fragments[i].skb_list);
+}
+
+static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
+{
+        int i;
+
+        for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
+                __skb_queue_purge(&sdata->fragments[i].skb_list);
+        }
+}
+
+/* Must be called with rtnl lock held. */
+int ieee80211_if_add(struct net_device *dev, const char *name,
+                     struct net_device **new_dev, int type)
+{
+        struct net_device *ndev;
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_sub_if_data *sdata = NULL;
+        int ret;
+
+        ASSERT_RTNL();
+        ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
+                            name, ieee80211_if_setup);
+        if (!ndev)
+                return -ENOMEM;
+
+        ret = dev_alloc_name(ndev, ndev->name);
+        if (ret < 0)
+                goto fail;
+
+        memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
+        ndev->base_addr = dev->base_addr;
+        ndev->irq = dev->irq;
+        ndev->mem_start = dev->mem_start;
+        ndev->mem_end = dev->mem_end;
+        SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
+        ndev->ieee80211_ptr = &sdata->wdev;
+        sdata->wdev.wiphy = local->hw.wiphy;
+        sdata->type = IEEE80211_IF_TYPE_AP;
+        sdata->dev = ndev;
+        sdata->local = local;
+        ieee80211_if_sdata_init(sdata);
+
+        ret = register_netdevice(ndev);
+        if (ret)
+                goto fail;
+
+        ieee80211_if_set_type(ndev, type);
+
+        write_lock_bh(&local->sub_if_lock);
+        if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
+                write_unlock_bh(&local->sub_if_lock);
+                __ieee80211_if_del(local, sdata);
+                return -ENODEV;
+        }
+        list_add(&sdata->list, &local->sub_if_list);
+        if (new_dev)
+                *new_dev = ndev;
+        write_unlock_bh(&local->sub_if_lock);
+
+        ieee80211_update_default_wep_only(local);
+
+        return 0;
+
+fail:
+        free_netdev(ndev);
+        return ret;
+}
+
+int ieee80211_if_add_mgmt(struct ieee80211_local *local)
+{
+        struct net_device *ndev;
+        struct ieee80211_sub_if_data *nsdata;
+        int ret;
+
+        ASSERT_RTNL();
+
+        ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
+                            ieee80211_if_mgmt_setup);
+        if (!ndev)
+                return -ENOMEM;
+        ret = dev_alloc_name(ndev, ndev->name);
+        if (ret < 0)
+                goto fail;
+
+        memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
+        SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
+
+        nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
+        ndev->ieee80211_ptr = &nsdata->wdev;
+        nsdata->wdev.wiphy = local->hw.wiphy;
+        nsdata->type = IEEE80211_IF_TYPE_MGMT;
+        nsdata->dev = ndev;
+        nsdata->local = local;
+        ieee80211_if_sdata_init(nsdata);
+
+        ret = register_netdevice(ndev);
+        if (ret)
+                goto fail;
+
+        if (local->open_count > 0)
+                dev_open(ndev);
+        local->apdev = ndev;
+        return 0;
+
+fail:
+        free_netdev(ndev);
+        return ret;
+}
+
+void ieee80211_if_del_mgmt(struct ieee80211_local *local)
+{
+        struct net_device *apdev;
+
+        ASSERT_RTNL();
+        apdev = local->apdev;
+        local->apdev = NULL;
+        unregister_netdevice(apdev);
+}
+
+void ieee80211_if_set_type(struct net_device *dev, int type)
+{
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+
+        sdata->type = type;
+        switch (type) {
+        case IEEE80211_IF_TYPE_WDS:
+                sdata->bss = NULL;
+                break;
+        case IEEE80211_IF_TYPE_VLAN:
+                break;
+        case IEEE80211_IF_TYPE_AP:
+                sdata->u.ap.dtim_period = 2;
+                sdata->u.ap.force_unicast_rateidx = -1;
+                sdata->u.ap.max_ratectrl_rateidx = -1;
+                skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
+                sdata->bss = &sdata->u.ap;
+                break;
+        case IEEE80211_IF_TYPE_STA:
+        case IEEE80211_IF_TYPE_IBSS: {
+                struct ieee80211_sub_if_data *msdata;
+                struct ieee80211_if_sta *ifsta;
+
+                ifsta = &sdata->u.sta;
+                INIT_WORK(&ifsta->work, ieee80211_sta_work);
+                setup_timer(&ifsta->timer, ieee80211_sta_timer,
+                            (unsigned long) sdata);
+                skb_queue_head_init(&ifsta->skb_queue);
+
+                ifsta->capab = WLAN_CAPABILITY_ESS;
+                ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
+                        IEEE80211_AUTH_ALG_SHARED_KEY;
+                ifsta->create_ibss = 1;
+                ifsta->wmm_enabled = 1;
+                ifsta->auto_channel_sel = 1;
+                ifsta->auto_bssid_sel = 1;
+
+                msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
+                sdata->bss = &msdata->u.ap;
+                break;
+        }
+        case IEEE80211_IF_TYPE_MNTR:
+                dev->type = ARPHRD_IEEE80211_RADIOTAP;
+                break;
+        default:
+                printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
+                       dev->name, __FUNCTION__, type);
+        }
+        ieee80211_update_default_wep_only(local);
+}
+
+/* Must be called with rtnl lock held. */
+void ieee80211_if_reinit(struct net_device *dev)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        struct sta_info *sta;
+        int i;
+
+        ASSERT_RTNL();
+        ieee80211_if_sdata_deinit(sdata);
+        for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
+                if (!sdata->keys[i])
+                        continue;
+#if 0
+                /* The interface is down at the moment, so there is not
+                 * really much point in disabling the keys at this point. */
+                memset(addr, 0xff, ETH_ALEN);
+                if (local->ops->set_key)
+                        local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
+                                            local->keys[i], 0);
+#endif
+                ieee80211_key_free(sdata->keys[i]);
+                sdata->keys[i] = NULL;
+        }
+
+        switch (sdata->type) {
+        case IEEE80211_IF_TYPE_AP: {
+                /* Remove all virtual interfaces that use this BSS
+                 * as their sdata->bss */
+                struct ieee80211_sub_if_data *tsdata, *n;
+                LIST_HEAD(tmp_list);
+
+                write_lock_bh(&local->sub_if_lock);
+                list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
+                        if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
+                                printk(KERN_DEBUG "%s: removing virtual "
+                                       "interface %s because its BSS interface"
+                                       " is being removed\n",
+                                       sdata->dev->name, tsdata->dev->name);
+                                list_move_tail(&tsdata->list, &tmp_list);
+                        }
+                }
+                write_unlock_bh(&local->sub_if_lock);
+
+                list_for_each_entry_safe(tsdata, n, &tmp_list, list)
+                        __ieee80211_if_del(local, tsdata);
+
+                kfree(sdata->u.ap.beacon_head);
+                kfree(sdata->u.ap.beacon_tail);
+                kfree(sdata->u.ap.generic_elem);
+
+                if (dev != local->mdev) {
+                        struct sk_buff *skb;
+                        while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
+                                local->total_ps_buffered--;
+                                dev_kfree_skb(skb);
+                        }
+                }
+
+                break;
+        }
+        case IEEE80211_IF_TYPE_WDS:
+                sta = sta_info_get(local, sdata->u.wds.remote_addr);
+                if (sta) {
+                        sta_info_put(sta);
+                        sta_info_free(sta, 0);
+                } else {
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+                        printk(KERN_DEBUG "%s: Someone had deleted my STA "
+                               "entry for the WDS link\n", dev->name);
+#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
+                }
+                break;
+        case IEEE80211_IF_TYPE_STA:
+        case IEEE80211_IF_TYPE_IBSS:
+                kfree(sdata->u.sta.extra_ie);
+                sdata->u.sta.extra_ie = NULL;
+                kfree(sdata->u.sta.assocreq_ies);
+                sdata->u.sta.assocreq_ies = NULL;
+                kfree(sdata->u.sta.assocresp_ies);
+                sdata->u.sta.assocresp_ies = NULL;
+                if (sdata->u.sta.probe_resp) {
+                        dev_kfree_skb(sdata->u.sta.probe_resp);
+                        sdata->u.sta.probe_resp = NULL;
+                }
+
+                break;
+        case IEEE80211_IF_TYPE_MNTR:
+                dev->type = ARPHRD_ETHER;
+                break;
+        }
+
+        /* remove all STAs that are bound to this virtual interface */
+        sta_info_flush(local, dev);
+
+        memset(&sdata->u, 0, sizeof(sdata->u));
+        ieee80211_if_sdata_init(sdata);
+}
+
+/* Must be called with rtnl lock held. */
+void __ieee80211_if_del(struct ieee80211_local *local,
+                        struct ieee80211_sub_if_data *sdata)
+{
+        struct net_device *dev = sdata->dev;
+
+        unregister_netdevice(dev);
+        /* Except master interface, the net_device will be freed by
+         * net_device->destructor (i. e. ieee80211_if_free). */
+}
+
+/* Must be called with rtnl lock held. */
+int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_sub_if_data *sdata, *n;
+
+        ASSERT_RTNL();
+
+        write_lock_bh(&local->sub_if_lock);
+        list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
+                if ((sdata->type == id || id == -1) &&
+                    strcmp(name, sdata->dev->name) == 0 &&
+                    sdata->dev != local->mdev) {
+                        list_del(&sdata->list);
+                        write_unlock_bh(&local->sub_if_lock);
+                        __ieee80211_if_del(local, sdata);
+                        ieee80211_update_default_wep_only(local);
+                        return 0;
+                }
+        }
+        write_unlock_bh(&local->sub_if_lock);
+        return -ENODEV;
+}
+
+void ieee80211_if_free(struct net_device *dev)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        /* local->apdev must be NULL when freeing management interface */
+        BUG_ON(dev == local->apdev);
+        ieee80211_if_sdata_deinit(sdata);
+        free_netdev(dev);
+}