1 /*!
2 * @file linux_mon.c
3 * @brief File Operations OS wrapper functionality
4 * @author mdaftedar
5 * @sa wilc_wfi_netdevice.h
6 * @date 01 MAR 2012
7 * @version 1.0
8 */
9 #include "wilc_wfi_cfgoperations.h"
10 #include "linux_wlan_common.h"
11 #include "wilc_wlan_if.h"
12 #include "wilc_wlan.h"
13
14
15 struct wilc_wfi_radiotap_hdr {
16 struct ieee80211_radiotap_header hdr;
17 u8 rate;
18 } __attribute__((packed));
19
20 struct wilc_wfi_radiotap_cb_hdr {
21 struct ieee80211_radiotap_header hdr;
22 u8 rate;
23 u8 dump;
24 u16 tx_flags;
25 } __attribute__((packed));
26
27 static struct net_device *wilc_wfi_mon; /* global monitor netdev */
28
29 extern int mac_xmit(struct sk_buff *skb, struct net_device *dev);
30
31
32 u8 srcAdd[6];
33 u8 bssid[6];
34 u8 broadcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
35 /**
36 * @brief WILC_WFI_monitor_rx
37 * @details
38 * @param[in]
39 * @return int : Return 0 on Success
40 * @author mdaftedar
41 * @date 12 JUL 2012
42 * @version 1.0
43 */
44
45 #define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
46 #define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive*/
47 #define IS_MANAGMEMENT 0x100
48 #define IS_MANAGMEMENT_CALLBACK 0x080
49 #define IS_MGMT_STATUS_SUCCES 0x040
50 #define GET_PKT_OFFSET(a) (((a) >> 22) & 0x1ff)
51
WILC_WFI_monitor_rx(u8 * buff,u32 size)52 void WILC_WFI_monitor_rx(u8 *buff, u32 size)
53 {
54 u32 header, pkt_offset;
55 struct sk_buff *skb = NULL;
56 struct wilc_wfi_radiotap_hdr *hdr;
57 struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
58
59 PRINT_INFO(HOSTAPD_DBG, "In monitor interface receive function\n");
60
61 if (wilc_wfi_mon == NULL)
62 return;
63
64 if (!netif_running(wilc_wfi_mon)) {
65 PRINT_INFO(HOSTAPD_DBG, "Monitor interface already RUNNING\n");
66 return;
67 }
68
69 /* Get WILC header */
70 memcpy(&header, (buff - HOST_HDR_OFFSET), HOST_HDR_OFFSET);
71
72 /* The packet offset field conain info about what type of managment frame */
73 /* we are dealing with and ack status */
74 pkt_offset = GET_PKT_OFFSET(header);
75
76 if (pkt_offset & IS_MANAGMEMENT_CALLBACK) {
77
78 /* hostapd callback mgmt frame */
79
80 skb = dev_alloc_skb(size + sizeof(struct wilc_wfi_radiotap_cb_hdr));
81 if (skb == NULL) {
82 PRINT_INFO(HOSTAPD_DBG, "Monitor if : No memory to allocate skb");
83 return;
84 }
85
86 memcpy(skb_put(skb, size), buff, size);
87
88 cb_hdr = (struct wilc_wfi_radiotap_cb_hdr *) skb_push(skb, sizeof(*cb_hdr));
89 memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
90
91 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
92
93 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_cb_hdr));
94
95 cb_hdr->hdr.it_present = cpu_to_le32(
96 (1 << IEEE80211_RADIOTAP_RATE) |
97 (1 << IEEE80211_RADIOTAP_TX_FLAGS));
98
99 cb_hdr->rate = 5; /* txrate->bitrate / 5; */
100
101 if (pkt_offset & IS_MGMT_STATUS_SUCCES) {
102 /* success */
103 cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_RTS;
104 } else {
105 cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_FAIL;
106 }
107
108 } else {
109
110 skb = dev_alloc_skb(size + sizeof(struct wilc_wfi_radiotap_hdr));
111
112 if (skb == NULL) {
113 PRINT_INFO(HOSTAPD_DBG, "Monitor if : No memory to allocate skb");
114 return;
115 }
116
117 memcpy(skb_put(skb, size), buff, size);
118 hdr = (struct wilc_wfi_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
119 memset(hdr, 0, sizeof(struct wilc_wfi_radiotap_hdr));
120 hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
121 hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_hdr));
122 PRINT_INFO(HOSTAPD_DBG, "Radiotap len %d\n", hdr->hdr.it_len);
123 hdr->hdr.it_present = cpu_to_le32
124 (1 << IEEE80211_RADIOTAP_RATE); /* | */
125 PRINT_INFO(HOSTAPD_DBG, "Presentflags %d\n", hdr->hdr.it_present);
126 hdr->rate = 5; /* txrate->bitrate / 5; */
127
128 }
129
130
131
132 skb->dev = wilc_wfi_mon;
133 skb_set_mac_header(skb, 0);
134 skb->ip_summed = CHECKSUM_UNNECESSARY;
135 skb->pkt_type = PACKET_OTHERHOST;
136 skb->protocol = htons(ETH_P_802_2);
137 memset(skb->cb, 0, sizeof(skb->cb));
138
139 netif_rx(skb);
140
141
142 }
143
144 struct tx_complete_mon_data {
145 int size;
146 void *buff;
147 };
148
mgmt_tx_complete(void * priv,int status)149 static void mgmt_tx_complete(void *priv, int status)
150 {
151
152 struct tx_complete_mon_data *pv_data = (struct tx_complete_mon_data *)priv;
153 u8 *buf = pv_data->buff;
154
155
156
157 if (status == 1) {
158 if (INFO || buf[0] == 0x10 || buf[0] == 0xb0)
159 PRINT_INFO(HOSTAPD_DBG, "Packet sent successfully - Size = %d - Address = %p.\n", pv_data->size, pv_data->buff);
160 } else {
161 PRINT_INFO(HOSTAPD_DBG, "Couldn't send packet - Size = %d - Address = %p.\n", pv_data->size, pv_data->buff);
162 }
163
164
165
166 /* incase of fully hosting mode, the freeing will be done in response to the cfg packet */
167 kfree(pv_data->buff);
168
169 kfree(pv_data);
170 }
mon_mgmt_tx(struct net_device * dev,const u8 * buf,size_t len)171 static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len)
172 {
173 struct tx_complete_mon_data *mgmt_tx = NULL;
174
175 if (dev == NULL) {
176 PRINT_D(HOSTAPD_DBG, "ERROR: dev == NULL\n");
177 return -EFAULT;
178 }
179
180 netif_stop_queue(dev);
181 mgmt_tx = kmalloc(sizeof(struct tx_complete_mon_data), GFP_ATOMIC);
182 if (mgmt_tx == NULL) {
183 PRINT_ER("Failed to allocate memory for mgmt_tx structure\n");
184 return -EFAULT;
185 }
186
187 mgmt_tx->buff = kmalloc(len, GFP_ATOMIC);
188 if (mgmt_tx->buff == NULL) {
189 PRINT_ER("Failed to allocate memory for mgmt_tx buff\n");
190 kfree(mgmt_tx);
191 return -EFAULT;
192
193 }
194
195 mgmt_tx->size = len;
196
197 memcpy(mgmt_tx->buff, buf, len);
198 wilc_wlan_txq_add_mgmt_pkt(mgmt_tx, mgmt_tx->buff, mgmt_tx->size,
199 mgmt_tx_complete);
200
201 netif_wake_queue(dev);
202 return 0;
203 }
204
205 /**
206 * @brief WILC_WFI_mon_xmit
207 * @details
208 * @param[in]
209 * @return int : Return 0 on Success
210 * @author mdaftedar
211 * @date 12 JUL 2012
212 * @version 1.0
213 */
WILC_WFI_mon_xmit(struct sk_buff * skb,struct net_device * dev)214 static netdev_tx_t WILC_WFI_mon_xmit(struct sk_buff *skb,
215 struct net_device *dev)
216 {
217 u32 rtap_len, i, ret = 0;
218 struct WILC_WFI_mon_priv *mon_priv;
219
220 struct sk_buff *skb2;
221 struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
222
223 if (wilc_wfi_mon == NULL)
224 return -EFAULT;
225
226 mon_priv = netdev_priv(wilc_wfi_mon);
227
228 if (mon_priv == NULL) {
229 PRINT_ER("Monitor interface private structure is NULL\n");
230 return -EFAULT;
231 }
232
233
234 rtap_len = ieee80211_get_radiotap_len(skb->data);
235 if (skb->len < rtap_len) {
236 PRINT_ER("Error in radiotap header\n");
237 return -1;
238 }
239 /* skip the radiotap header */
240 PRINT_INFO(HOSTAPD_DBG, "Radiotap len: %d\n", rtap_len);
241
242 if (INFO) {
243 for (i = 0; i < rtap_len; i++)
244 PRINT_INFO(HOSTAPD_DBG, "Radiotap_hdr[%d] %02x\n", i, skb->data[i]);
245 }
246 /* Skip the ratio tap header */
247 skb_pull(skb, rtap_len);
248
249 if (skb->data[0] == 0xc0)
250 PRINT_INFO(HOSTAPD_DBG, "%x:%x:%x:%x:%x%x\n", skb->data[4], skb->data[5], skb->data[6], skb->data[7], skb->data[8], skb->data[9]);
251
252 if (skb->data[0] == 0xc0 && (!(memcmp(broadcast, &skb->data[4], 6)))) {
253 skb2 = dev_alloc_skb(skb->len + sizeof(struct wilc_wfi_radiotap_cb_hdr));
254
255 memcpy(skb_put(skb2, skb->len), skb->data, skb->len);
256
257 cb_hdr = (struct wilc_wfi_radiotap_cb_hdr *) skb_push(skb2, sizeof(*cb_hdr));
258 memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
259
260 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
261
262 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_cb_hdr));
263
264 cb_hdr->hdr.it_present = cpu_to_le32(
265 (1 << IEEE80211_RADIOTAP_RATE) |
266 (1 << IEEE80211_RADIOTAP_TX_FLAGS));
267
268 cb_hdr->rate = 5; /* txrate->bitrate / 5; */
269 cb_hdr->tx_flags = 0x0004;
270
271 skb2->dev = wilc_wfi_mon;
272 skb_set_mac_header(skb2, 0);
273 skb2->ip_summed = CHECKSUM_UNNECESSARY;
274 skb2->pkt_type = PACKET_OTHERHOST;
275 skb2->protocol = htons(ETH_P_802_2);
276 memset(skb2->cb, 0, sizeof(skb2->cb));
277
278 netif_rx(skb2);
279
280 return 0;
281 }
282 skb->dev = mon_priv->real_ndev;
283
284 PRINT_INFO(HOSTAPD_DBG, "Skipping the radiotap header\n");
285
286
287
288 /* actual deliver of data is device-specific, and not shown here */
289 PRINT_INFO(HOSTAPD_DBG, "SKB netdevice name = %s\n", skb->dev->name);
290 PRINT_INFO(HOSTAPD_DBG, "MONITOR real dev name = %s\n", mon_priv->real_ndev->name);
291
292 /* Identify if Ethernet or MAC header (data or mgmt) */
293 memcpy(srcAdd, &skb->data[10], 6);
294 memcpy(bssid, &skb->data[16], 6);
295 /* if source address and bssid fields are equal>>Mac header */
296 /*send it to mgmt frames handler */
297 if (!(memcmp(srcAdd, bssid, 6))) {
298 mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len);
299 dev_kfree_skb(skb);
300 } else
301 ret = mac_xmit(skb, mon_priv->real_ndev);
302
303 return ret;
304 }
305
306 static const struct net_device_ops wilc_wfi_netdev_ops = {
307 .ndo_start_xmit = WILC_WFI_mon_xmit,
308
309 };
310
311 /**
312 * @brief WILC_WFI_init_mon_interface
313 * @details
314 * @param[in]
315 * @return int : Return 0 on Success
316 * @author mdaftedar
317 * @date 12 JUL 2012
318 * @version 1.0
319 */
WILC_WFI_init_mon_interface(const char * name,struct net_device * real_dev)320 struct net_device *WILC_WFI_init_mon_interface(const char *name, struct net_device *real_dev)
321 {
322
323
324 u32 ret = 0;
325 struct WILC_WFI_mon_priv *priv;
326
327 /*If monitor interface is already initialized, return it*/
328 if (wilc_wfi_mon) {
329 return wilc_wfi_mon;
330 }
331
332 wilc_wfi_mon = alloc_etherdev(sizeof(struct WILC_WFI_mon_priv));
333 if (!wilc_wfi_mon) {
334 PRINT_ER("failed to allocate memory\n");
335 return NULL;
336
337 }
338
339 wilc_wfi_mon->type = ARPHRD_IEEE80211_RADIOTAP;
340 strncpy(wilc_wfi_mon->name, name, IFNAMSIZ);
341 wilc_wfi_mon->name[IFNAMSIZ - 1] = 0;
342 wilc_wfi_mon->netdev_ops = &wilc_wfi_netdev_ops;
343
344 ret = register_netdevice(wilc_wfi_mon);
345 if (ret) {
346 PRINT_ER(" register_netdevice failed (%d)\n", ret);
347 return NULL;
348 }
349 priv = netdev_priv(wilc_wfi_mon);
350 if (priv == NULL) {
351 PRINT_ER("private structure is NULL\n");
352 return NULL;
353 }
354
355 priv->real_ndev = real_dev;
356
357 return wilc_wfi_mon;
358 }
359
360 /**
361 * @brief WILC_WFI_deinit_mon_interface
362 * @details
363 * @param[in]
364 * @return int : Return 0 on Success
365 * @author mdaftedar
366 * @date 12 JUL 2012
367 * @version 1.0
368 */
WILC_WFI_deinit_mon_interface(void)369 int WILC_WFI_deinit_mon_interface(void)
370 {
371 bool rollback_lock = false;
372
373 if (wilc_wfi_mon != NULL) {
374 PRINT_D(HOSTAPD_DBG, "In Deinit monitor interface\n");
375 PRINT_D(HOSTAPD_DBG, "RTNL is being locked\n");
376 if (rtnl_is_locked()) {
377 rtnl_unlock();
378 rollback_lock = true;
379 }
380 PRINT_D(HOSTAPD_DBG, "Unregister netdev\n");
381 unregister_netdev(wilc_wfi_mon);
382
383 if (rollback_lock) {
384 rtnl_lock();
385 rollback_lock = false;
386 }
387 wilc_wfi_mon = NULL;
388 }
389 return 0;
390
391 }
392