Add HostAP wireless driver.

Includes minor cleanups from Adrian Bunk <bunk@stusta.de>.

1 files changed, 272 insertions, 0 deletions

diff --git a/drivers/net/wireless/hostap/hostap_ap.h b/drivers/net/wireless/hostap/hostap_ap.h
new file mode 100644
index 00000000000..10137f44436
--- /dev/null
+++ b/drivers/net/wireless/hostap/hostap_ap.h
@@ -0,0 +1,272 @@
+#ifndef HOSTAP_AP_H
+#define HOSTAP_AP_H
+
+/* AP data structures for STAs */
+
+/* maximum number of frames to buffer per STA */
+#define STA_MAX_TX_BUFFER 32
+
+/* Flags used in skb->cb[6] to control how the packet is handled in TX path.
+ * skb->cb[0..5] must contain magic value 'hostap' to indicate that cb[6] is
+ * used. */
+#define AP_SKB_CB_MAGIC "hostap"
+#define AP_SKB_CB_MAGIC_LEN 6
+#define AP_SKB_CB_BUFFERED_FRAME BIT(0)
+#define AP_SKB_CB_ADD_MOREDATA BIT(1)
+
+
+/* STA flags */
+#define WLAN_STA_AUTH BIT(0)
+#define WLAN_STA_ASSOC BIT(1)
+#define WLAN_STA_PS BIT(2)
+#define WLAN_STA_TIM BIT(3) /* TIM bit is on for PS stations */
+#define WLAN_STA_PERM BIT(4) /* permanent; do not remove entry on expiration */
+#define WLAN_STA_AUTHORIZED BIT(5) /* If 802.1X is used, this flag is
+                                    * controlling whether STA is authorized to
+                                    * send and receive non-IEEE 802.1X frames
+                                    */
+#define WLAN_STA_PENDING_POLL BIT(6) /* pending activity poll not ACKed */
+
+#define WLAN_RATE_1M BIT(0)
+#define WLAN_RATE_2M BIT(1)
+#define WLAN_RATE_5M5 BIT(2)
+#define WLAN_RATE_11M BIT(3)
+#define WLAN_RATE_COUNT 4
+
+/* Maximum size of Supported Rates info element. IEEE 802.11 has a limit of 8,
+ * but some pre-standard IEEE 802.11g products use longer elements. */
+#define WLAN_SUPP_RATES_MAX 32
+
+/* Try to increase TX rate after # successfully sent consecutive packets */
+#define WLAN_RATE_UPDATE_COUNT 50
+
+/* Decrease TX rate after # consecutive dropped packets */
+#define WLAN_RATE_DECREASE_THRESHOLD 2
+
+struct sta_info {
+        struct list_head list;
+        struct sta_info *hnext; /* next entry in hash table list */
+        atomic_t users; /* number of users (do not remove if > 0) */
+        struct proc_dir_entry *proc;
+
+        u8 addr[6];
+        u16 aid; /* STA's unique AID (1 .. 2007) or 0 if not yet assigned */
+        u32 flags;
+        u16 capability;
+        u16 listen_interval; /* or beacon_int for APs */
+        u8 supported_rates[WLAN_SUPP_RATES_MAX];
+
+        unsigned long last_auth;
+        unsigned long last_assoc;
+        unsigned long last_rx;
+        unsigned long last_tx;
+        unsigned long rx_packets, tx_packets;
+        unsigned long rx_bytes, tx_bytes;
+        struct sk_buff_head tx_buf;
+        /* FIX: timeout buffers with an expiry time somehow derived from
+         * listen_interval */
+
+        s8 last_rx_silence; /* Noise in dBm */
+        s8 last_rx_signal; /* Signal strength in dBm */
+        u8 last_rx_rate; /* TX rate in 0.1 Mbps */
+        u8 last_rx_updated; /* IWSPY's struct iw_quality::updated */
+
+        u8 tx_supp_rates; /* bit field of supported TX rates */
+        u8 tx_rate; /* current TX rate (in 0.1 Mbps) */
+        u8 tx_rate_idx; /* current TX rate (WLAN_RATE_*) */
+        u8 tx_max_rate; /* max TX rate (WLAN_RATE_*) */
+        u32 tx_count[WLAN_RATE_COUNT]; /* number of frames sent (per rate) */
+        u32 rx_count[WLAN_RATE_COUNT]; /* number of frames received (per rate)
+                                        */
+        u32 tx_since_last_failure;
+        u32 tx_consecutive_exc;
+
+        struct prism2_crypt_data *crypt;
+
+        int ap; /* whether this station is an AP */
+
+        local_info_t *local;
+
+#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
+        union {
+                struct {
+                        char *challenge; /* shared key authentication
+                                          * challenge */
+                } sta;
+                struct {
+                        int ssid_len;
+                        unsigned char ssid[MAX_SSID_LEN + 1]; /* AP's ssid */
+                        int channel;
+                        unsigned long last_beacon; /* last RX beacon time */
+                } ap;
+        } u;
+
+        struct timer_list timer;
+        enum { STA_NULLFUNC = 0, STA_DISASSOC, STA_DEAUTH } timeout_next;
+#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
+};
+
+
+#define MAX_STA_COUNT 1024
+
+/* Maximum number of AIDs to use for STAs; must be 2007 or lower
+ * (8802.11 limitation) */
+#define MAX_AID_TABLE_SIZE 128
+
+#define STA_HASH_SIZE 256
+#define STA_HASH(sta) (sta[5])
+
+
+/* Default value for maximum station inactivity. After AP_MAX_INACTIVITY_SEC
+ * has passed since last received frame from the station, a nullfunc data
+ * frame is sent to the station. If this frame is not acknowledged and no other
+ * frames have been received, the station will be disassociated after
+ * AP_DISASSOC_DELAY. Similarily, a the station will be deauthenticated after
+ * AP_DEAUTH_DELAY. AP_TIMEOUT_RESOLUTION is the resolution that is used with
+ * max inactivity timer. */
+#define AP_MAX_INACTIVITY_SEC (5 * 60)
+#define AP_DISASSOC_DELAY (HZ)
+#define AP_DEAUTH_DELAY (HZ)
+
+/* ap_policy: whether to accept frames to/from other APs/IBSS */
+typedef enum {
+        AP_OTHER_AP_SKIP_ALL = 0,
+        AP_OTHER_AP_SAME_SSID = 1,
+        AP_OTHER_AP_ALL = 2,
+        AP_OTHER_AP_EVEN_IBSS = 3
+} ap_policy_enum;
+
+#define PRISM2_AUTH_OPEN BIT(0)
+#define PRISM2_AUTH_SHARED_KEY BIT(1)
+
+
+/* MAC address-based restrictions */
+struct mac_entry {
+        struct list_head list;
+        u8 addr[6];
+};
+
+struct mac_restrictions {
+        enum { MAC_POLICY_OPEN = 0, MAC_POLICY_ALLOW, MAC_POLICY_DENY } policy;
+        unsigned int entries;
+        struct list_head mac_list;
+        spinlock_t lock;
+};
+
+
+struct add_sta_proc_data {
+        u8 addr[ETH_ALEN];
+        struct add_sta_proc_data *next;
+};
+
+
+typedef enum { WDS_ADD, WDS_DEL } wds_oper_type;
+struct wds_oper_data {
+        wds_oper_type type;
+        u8 addr[ETH_ALEN];
+        struct wds_oper_data *next;
+};
+
+
+struct ap_data {
+        int initialized; /* whether ap_data has been initialized */
+        local_info_t *local;
+        int bridge_packets; /* send packet to associated STAs directly to the
+                             * wireless media instead of higher layers in the
+                             * kernel */
+        unsigned int bridged_unicast; /* number of unicast frames bridged on
+                                       * wireless media */
+        unsigned int bridged_multicast; /* number of non-unicast frames
+                                         * bridged on wireless media */
+        unsigned int tx_drop_nonassoc; /* number of unicast TX packets dropped
+                                        * because they were to an address that
+                                        * was not associated */
+        int nullfunc_ack; /* use workaround for nullfunc frame ACKs */
+
+        spinlock_t sta_table_lock;
+        int num_sta; /* number of entries in sta_list */
+        struct list_head sta_list; /* STA info list head */
+        struct sta_info *sta_hash[STA_HASH_SIZE];
+
+        struct proc_dir_entry *proc;
+
+        ap_policy_enum ap_policy;
+        unsigned int max_inactivity;
+        int autom_ap_wds;
+
+        struct mac_restrictions mac_restrictions; /* MAC-based auth */
+        int last_tx_rate;
+
+        struct work_struct add_sta_proc_queue;
+        struct add_sta_proc_data *add_sta_proc_entries;
+
+        struct work_struct wds_oper_queue;
+        struct wds_oper_data *wds_oper_entries;
+
+        u16 tx_callback_idx;
+
+#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
+        /* pointers to STA info; based on allocated AID or NULL if AID free
+         * AID is in the range 1-2007, so sta_aid[0] corresponders to AID 1
+         * and so on
+         */
+        struct sta_info *sta_aid[MAX_AID_TABLE_SIZE];
+
+        u16 tx_callback_auth, tx_callback_assoc, tx_callback_poll;
+
+        /* WEP operations for generating challenges to be used with shared key
+         * authentication */
+        struct hostap_crypto_ops *crypt;
+        void *crypt_priv;
+#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
+};
+
+
+void hostap_rx(struct net_device *dev, struct sk_buff *skb,
+               struct hostap_80211_rx_status *rx_stats);
+void hostap_init_data(local_info_t *local);
+void hostap_init_ap_proc(local_info_t *local);
+void hostap_free_data(struct ap_data *ap);
+void hostap_check_sta_fw_version(struct ap_data *ap, int sta_fw_ver);
+
+typedef enum {
+        AP_TX_CONTINUE, AP_TX_DROP, AP_TX_RETRY, AP_TX_BUFFERED,
+        AP_TX_CONTINUE_NOT_AUTHORIZED
+} ap_tx_ret;
+struct hostap_tx_data {
+        struct sk_buff *skb;
+        int host_encrypt;
+        struct prism2_crypt_data *crypt;
+        void *sta_ptr;
+};
+ap_tx_ret hostap_handle_sta_tx(local_info_t *local, struct hostap_tx_data *tx);
+void hostap_handle_sta_release(void *ptr);
+void hostap_handle_sta_tx_exc(local_info_t *local, struct sk_buff *skb);
+int hostap_update_sta_ps(local_info_t *local,
+                         struct hostap_ieee80211_hdr *hdr);
+typedef enum {
+        AP_RX_CONTINUE, AP_RX_DROP, AP_RX_EXIT, AP_RX_CONTINUE_NOT_AUTHORIZED
+} ap_rx_ret;
+ap_rx_ret hostap_handle_sta_rx(local_info_t *local, struct net_device *dev,
+                               struct sk_buff *skb,
+                               struct hostap_80211_rx_status *rx_stats,
+                               int wds);
+int hostap_handle_sta_crypto(local_info_t *local,
+                             struct hostap_ieee80211_hdr *hdr,
+                             struct prism2_crypt_data **crypt, void **sta_ptr);
+int hostap_is_sta_assoc(struct ap_data *ap, u8 *sta_addr);
+int hostap_is_sta_authorized(struct ap_data *ap, u8 *sta_addr);
+int hostap_add_sta(struct ap_data *ap, u8 *sta_addr);
+int hostap_update_rx_stats(struct ap_data *ap,
+                           struct hostap_ieee80211_hdr *hdr,
+                           struct hostap_80211_rx_status *rx_stats);
+void hostap_update_rates(local_info_t *local);
+void hostap_add_wds_links(local_info_t *local);
+void hostap_wds_link_oper(local_info_t *local, u8 *addr, wds_oper_type type);
+
+#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
+void hostap_deauth_all_stas(struct net_device *dev, struct ap_data *ap,
+                            int resend);
+#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
+
+#endif /* HOSTAP_AP_H */