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Commit | Line | Data |
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ff1d2767 | 1 | #include <linux/etherdevice.h> |
5fad5a2e | 2 | #include <net/ieee80211_crypt.h> |
ff1d2767 JM |
3 | |
4 | #include "hostap_80211.h" | |
5 | #include "hostap.h" | |
5fad5a2e AB |
6 | #include "hostap_ap.h" |
7 | ||
8 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
9 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
10 | static unsigned char rfc1042_header[] = | |
11 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
12 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
13 | static unsigned char bridge_tunnel_header[] = | |
14 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
15 | /* No encapsulation header if EtherType < 0x600 (=length) */ | |
ff1d2767 JM |
16 | |
17 | void hostap_dump_rx_80211(const char *name, struct sk_buff *skb, | |
18 | struct hostap_80211_rx_status *rx_stats) | |
19 | { | |
d041674d | 20 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
21 | u16 fc; |
22 | ||
d041674d | 23 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
ff1d2767 JM |
24 | |
25 | printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d " | |
26 | "jiffies=%ld\n", | |
27 | name, rx_stats->signal, rx_stats->noise, rx_stats->rate, | |
28 | skb->len, jiffies); | |
29 | ||
30 | if (skb->len < 2) | |
31 | return; | |
32 | ||
c0f72ca8 | 33 | fc = le16_to_cpu(hdr->frame_ctl); |
ff1d2767 | 34 | printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s", |
4339d328 | 35 | fc, WLAN_FC_GET_TYPE(fc) >> 2, WLAN_FC_GET_STYPE(fc) >> 4, |
b2f4a2e3 JM |
36 | fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "", |
37 | fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : ""); | |
ff1d2767 JM |
38 | |
39 | if (skb->len < IEEE80211_DATA_HDR3_LEN) { | |
40 | printk("\n"); | |
41 | return; | |
42 | } | |
43 | ||
44 | printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id), | |
c0f72ca8 | 45 | le16_to_cpu(hdr->seq_ctl)); |
ff1d2767 JM |
46 | |
47 | printk(KERN_DEBUG " A1=" MACSTR " A2=" MACSTR " A3=" MACSTR, | |
48 | MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), MAC2STR(hdr->addr3)); | |
49 | if (skb->len >= 30) | |
50 | printk(" A4=" MACSTR, MAC2STR(hdr->addr4)); | |
51 | printk("\n"); | |
52 | } | |
53 | ||
54 | ||
55 | /* Send RX frame to netif with 802.11 (and possible prism) header. | |
56 | * Called from hardware or software IRQ context. */ | |
57 | int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb, | |
58 | struct hostap_80211_rx_status *rx_stats, int type) | |
59 | { | |
60 | struct hostap_interface *iface; | |
61 | local_info_t *local; | |
62 | int hdrlen, phdrlen, head_need, tail_need; | |
63 | u16 fc; | |
64 | int prism_header, ret; | |
d041674d | 65 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
66 | |
67 | iface = netdev_priv(dev); | |
68 | local = iface->local; | |
69 | dev->last_rx = jiffies; | |
70 | ||
71 | if (dev->type == ARPHRD_IEEE80211_PRISM) { | |
72 | if (local->monitor_type == PRISM2_MONITOR_PRISM) { | |
73 | prism_header = 1; | |
74 | phdrlen = sizeof(struct linux_wlan_ng_prism_hdr); | |
75 | } else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */ | |
76 | prism_header = 2; | |
77 | phdrlen = sizeof(struct linux_wlan_ng_cap_hdr); | |
78 | } | |
79 | } else { | |
80 | prism_header = 0; | |
81 | phdrlen = 0; | |
82 | } | |
83 | ||
d041674d | 84 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
c0f72ca8 | 85 | fc = le16_to_cpu(hdr->frame_ctl); |
ff1d2767 | 86 | |
b2f4a2e3 | 87 | if (type == PRISM2_RX_MGMT && (fc & IEEE80211_FCTL_VERS)) { |
ff1d2767 | 88 | printk(KERN_DEBUG "%s: dropped management frame with header " |
b2f4a2e3 | 89 | "version %d\n", dev->name, fc & IEEE80211_FCTL_VERS); |
ff1d2767 JM |
90 | dev_kfree_skb_any(skb); |
91 | return 0; | |
92 | } | |
93 | ||
94 | hdrlen = hostap_80211_get_hdrlen(fc); | |
95 | ||
96 | /* check if there is enough room for extra data; if not, expand skb | |
97 | * buffer to be large enough for the changes */ | |
98 | head_need = phdrlen; | |
99 | tail_need = 0; | |
100 | #ifdef PRISM2_ADD_BOGUS_CRC | |
101 | tail_need += 4; | |
102 | #endif /* PRISM2_ADD_BOGUS_CRC */ | |
103 | ||
104 | head_need -= skb_headroom(skb); | |
105 | tail_need -= skb_tailroom(skb); | |
106 | ||
107 | if (head_need > 0 || tail_need > 0) { | |
108 | if (pskb_expand_head(skb, head_need > 0 ? head_need : 0, | |
109 | tail_need > 0 ? tail_need : 0, | |
110 | GFP_ATOMIC)) { | |
111 | printk(KERN_DEBUG "%s: prism2_rx_80211 failed to " | |
112 | "reallocate skb buffer\n", dev->name); | |
113 | dev_kfree_skb_any(skb); | |
114 | return 0; | |
115 | } | |
116 | } | |
117 | ||
118 | /* We now have an skb with enough head and tail room, so just insert | |
119 | * the extra data */ | |
120 | ||
121 | #ifdef PRISM2_ADD_BOGUS_CRC | |
122 | memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */ | |
123 | #endif /* PRISM2_ADD_BOGUS_CRC */ | |
124 | ||
125 | if (prism_header == 1) { | |
126 | struct linux_wlan_ng_prism_hdr *hdr; | |
127 | hdr = (struct linux_wlan_ng_prism_hdr *) | |
128 | skb_push(skb, phdrlen); | |
129 | memset(hdr, 0, phdrlen); | |
130 | hdr->msgcode = LWNG_CAP_DID_BASE; | |
131 | hdr->msglen = sizeof(*hdr); | |
132 | memcpy(hdr->devname, dev->name, sizeof(hdr->devname)); | |
133 | #define LWNG_SETVAL(f,i,s,l,d) \ | |
134 | hdr->f.did = LWNG_CAP_DID_BASE | (i << 12); \ | |
135 | hdr->f.status = s; hdr->f.len = l; hdr->f.data = d | |
136 | LWNG_SETVAL(hosttime, 1, 0, 4, jiffies); | |
3e1d3932 | 137 | LWNG_SETVAL(mactime, 2, 0, 4, rx_stats->mac_time); |
ff1d2767 JM |
138 | LWNG_SETVAL(channel, 3, 1 /* no value */, 4, 0); |
139 | LWNG_SETVAL(rssi, 4, 1 /* no value */, 4, 0); | |
140 | LWNG_SETVAL(sq, 5, 1 /* no value */, 4, 0); | |
141 | LWNG_SETVAL(signal, 6, 0, 4, rx_stats->signal); | |
142 | LWNG_SETVAL(noise, 7, 0, 4, rx_stats->noise); | |
143 | LWNG_SETVAL(rate, 8, 0, 4, rx_stats->rate / 5); | |
144 | LWNG_SETVAL(istx, 9, 0, 4, 0); | |
145 | LWNG_SETVAL(frmlen, 10, 0, 4, skb->len - phdrlen); | |
146 | #undef LWNG_SETVAL | |
147 | } else if (prism_header == 2) { | |
148 | struct linux_wlan_ng_cap_hdr *hdr; | |
149 | hdr = (struct linux_wlan_ng_cap_hdr *) | |
150 | skb_push(skb, phdrlen); | |
151 | memset(hdr, 0, phdrlen); | |
152 | hdr->version = htonl(LWNG_CAPHDR_VERSION); | |
153 | hdr->length = htonl(phdrlen); | |
154 | hdr->mactime = __cpu_to_be64(rx_stats->mac_time); | |
155 | hdr->hosttime = __cpu_to_be64(jiffies); | |
156 | hdr->phytype = htonl(4); /* dss_dot11_b */ | |
157 | hdr->channel = htonl(local->channel); | |
158 | hdr->datarate = htonl(rx_stats->rate); | |
159 | hdr->antenna = htonl(0); /* unknown */ | |
160 | hdr->priority = htonl(0); /* unknown */ | |
161 | hdr->ssi_type = htonl(3); /* raw */ | |
162 | hdr->ssi_signal = htonl(rx_stats->signal); | |
163 | hdr->ssi_noise = htonl(rx_stats->noise); | |
164 | hdr->preamble = htonl(0); /* unknown */ | |
165 | hdr->encoding = htonl(1); /* cck */ | |
166 | } | |
167 | ||
168 | ret = skb->len - phdrlen; | |
169 | skb->dev = dev; | |
459a98ed | 170 | skb_reset_mac_header(skb); |
ff1d2767 JM |
171 | skb_pull(skb, hdrlen); |
172 | if (prism_header) | |
173 | skb_pull(skb, phdrlen); | |
174 | skb->pkt_type = PACKET_OTHERHOST; | |
175 | skb->protocol = __constant_htons(ETH_P_802_2); | |
176 | memset(skb->cb, 0, sizeof(skb->cb)); | |
177 | netif_rx(skb); | |
178 | ||
179 | return ret; | |
180 | } | |
181 | ||
182 | ||
183 | /* Called only as a tasklet (software IRQ) */ | |
184 | static void monitor_rx(struct net_device *dev, struct sk_buff *skb, | |
185 | struct hostap_80211_rx_status *rx_stats) | |
186 | { | |
187 | struct net_device_stats *stats; | |
188 | int len; | |
189 | ||
190 | len = prism2_rx_80211(dev, skb, rx_stats, PRISM2_RX_MONITOR); | |
191 | stats = hostap_get_stats(dev); | |
192 | stats->rx_packets++; | |
193 | stats->rx_bytes += len; | |
194 | } | |
195 | ||
196 | ||
197 | /* Called only as a tasklet (software IRQ) */ | |
198 | static struct prism2_frag_entry * | |
199 | prism2_frag_cache_find(local_info_t *local, unsigned int seq, | |
200 | unsigned int frag, u8 *src, u8 *dst) | |
201 | { | |
202 | struct prism2_frag_entry *entry; | |
203 | int i; | |
204 | ||
205 | for (i = 0; i < PRISM2_FRAG_CACHE_LEN; i++) { | |
206 | entry = &local->frag_cache[i]; | |
207 | if (entry->skb != NULL && | |
208 | time_after(jiffies, entry->first_frag_time + 2 * HZ)) { | |
209 | printk(KERN_DEBUG "%s: expiring fragment cache entry " | |
210 | "seq=%u last_frag=%u\n", | |
211 | local->dev->name, entry->seq, entry->last_frag); | |
212 | dev_kfree_skb(entry->skb); | |
213 | entry->skb = NULL; | |
214 | } | |
215 | ||
216 | if (entry->skb != NULL && entry->seq == seq && | |
217 | (entry->last_frag + 1 == frag || frag == -1) && | |
218 | memcmp(entry->src_addr, src, ETH_ALEN) == 0 && | |
219 | memcmp(entry->dst_addr, dst, ETH_ALEN) == 0) | |
220 | return entry; | |
221 | } | |
222 | ||
223 | return NULL; | |
224 | } | |
225 | ||
226 | ||
227 | /* Called only as a tasklet (software IRQ) */ | |
228 | static struct sk_buff * | |
d041674d | 229 | prism2_frag_cache_get(local_info_t *local, struct ieee80211_hdr_4addr *hdr) |
ff1d2767 JM |
230 | { |
231 | struct sk_buff *skb = NULL; | |
232 | u16 sc; | |
233 | unsigned int frag, seq; | |
234 | struct prism2_frag_entry *entry; | |
235 | ||
c0f72ca8 | 236 | sc = le16_to_cpu(hdr->seq_ctl); |
ff1d2767 | 237 | frag = WLAN_GET_SEQ_FRAG(sc); |
ebed67d2 | 238 | seq = WLAN_GET_SEQ_SEQ(sc) >> 4; |
ff1d2767 JM |
239 | |
240 | if (frag == 0) { | |
241 | /* Reserve enough space to fit maximum frame length */ | |
242 | skb = dev_alloc_skb(local->dev->mtu + | |
d041674d | 243 | sizeof(struct ieee80211_hdr_4addr) + |
ff1d2767 JM |
244 | 8 /* LLC */ + |
245 | 2 /* alignment */ + | |
246 | 8 /* WEP */ + ETH_ALEN /* WDS */); | |
247 | if (skb == NULL) | |
248 | return NULL; | |
249 | ||
250 | entry = &local->frag_cache[local->frag_next_idx]; | |
251 | local->frag_next_idx++; | |
252 | if (local->frag_next_idx >= PRISM2_FRAG_CACHE_LEN) | |
253 | local->frag_next_idx = 0; | |
254 | ||
255 | if (entry->skb != NULL) | |
256 | dev_kfree_skb(entry->skb); | |
257 | ||
258 | entry->first_frag_time = jiffies; | |
259 | entry->seq = seq; | |
260 | entry->last_frag = frag; | |
261 | entry->skb = skb; | |
262 | memcpy(entry->src_addr, hdr->addr2, ETH_ALEN); | |
263 | memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN); | |
264 | } else { | |
265 | /* received a fragment of a frame for which the head fragment | |
266 | * should have already been received */ | |
267 | entry = prism2_frag_cache_find(local, seq, frag, hdr->addr2, | |
268 | hdr->addr1); | |
269 | if (entry != NULL) { | |
270 | entry->last_frag = frag; | |
271 | skb = entry->skb; | |
272 | } | |
273 | } | |
274 | ||
275 | return skb; | |
276 | } | |
277 | ||
278 | ||
279 | /* Called only as a tasklet (software IRQ) */ | |
280 | static int prism2_frag_cache_invalidate(local_info_t *local, | |
d041674d | 281 | struct ieee80211_hdr_4addr *hdr) |
ff1d2767 JM |
282 | { |
283 | u16 sc; | |
284 | unsigned int seq; | |
285 | struct prism2_frag_entry *entry; | |
286 | ||
c0f72ca8 | 287 | sc = le16_to_cpu(hdr->seq_ctl); |
ebed67d2 | 288 | seq = WLAN_GET_SEQ_SEQ(sc) >> 4; |
ff1d2767 JM |
289 | |
290 | entry = prism2_frag_cache_find(local, seq, -1, hdr->addr2, hdr->addr1); | |
291 | ||
292 | if (entry == NULL) { | |
293 | printk(KERN_DEBUG "%s: could not invalidate fragment cache " | |
294 | "entry (seq=%u)\n", | |
295 | local->dev->name, seq); | |
296 | return -1; | |
297 | } | |
298 | ||
299 | entry->skb = NULL; | |
300 | return 0; | |
301 | } | |
302 | ||
303 | ||
304 | static struct hostap_bss_info *__hostap_get_bss(local_info_t *local, u8 *bssid, | |
305 | u8 *ssid, size_t ssid_len) | |
306 | { | |
307 | struct list_head *ptr; | |
308 | struct hostap_bss_info *bss; | |
309 | ||
310 | list_for_each(ptr, &local->bss_list) { | |
311 | bss = list_entry(ptr, struct hostap_bss_info, list); | |
312 | if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && | |
313 | (ssid == NULL || | |
314 | (ssid_len == bss->ssid_len && | |
315 | memcmp(ssid, bss->ssid, ssid_len) == 0))) { | |
316 | list_move(&bss->list, &local->bss_list); | |
317 | return bss; | |
318 | } | |
319 | } | |
320 | ||
321 | return NULL; | |
322 | } | |
323 | ||
324 | ||
325 | static struct hostap_bss_info *__hostap_add_bss(local_info_t *local, u8 *bssid, | |
326 | u8 *ssid, size_t ssid_len) | |
327 | { | |
328 | struct hostap_bss_info *bss; | |
329 | ||
330 | if (local->num_bss_info >= HOSTAP_MAX_BSS_COUNT) { | |
331 | bss = list_entry(local->bss_list.prev, | |
332 | struct hostap_bss_info, list); | |
333 | list_del(&bss->list); | |
334 | local->num_bss_info--; | |
335 | } else { | |
336 | bss = (struct hostap_bss_info *) | |
337 | kmalloc(sizeof(*bss), GFP_ATOMIC); | |
338 | if (bss == NULL) | |
339 | return NULL; | |
340 | } | |
341 | ||
342 | memset(bss, 0, sizeof(*bss)); | |
343 | memcpy(bss->bssid, bssid, ETH_ALEN); | |
344 | memcpy(bss->ssid, ssid, ssid_len); | |
345 | bss->ssid_len = ssid_len; | |
346 | local->num_bss_info++; | |
347 | list_add(&bss->list, &local->bss_list); | |
348 | return bss; | |
349 | } | |
350 | ||
351 | ||
352 | static void __hostap_expire_bss(local_info_t *local) | |
353 | { | |
354 | struct hostap_bss_info *bss; | |
355 | ||
356 | while (local->num_bss_info > 0) { | |
357 | bss = list_entry(local->bss_list.prev, | |
358 | struct hostap_bss_info, list); | |
359 | if (!time_after(jiffies, bss->last_update + 60 * HZ)) | |
360 | break; | |
361 | ||
362 | list_del(&bss->list); | |
363 | local->num_bss_info--; | |
364 | kfree(bss); | |
365 | } | |
366 | } | |
367 | ||
368 | ||
369 | /* Both IEEE 802.11 Beacon and Probe Response frames have similar structure, so | |
370 | * the same routine can be used to parse both of them. */ | |
371 | static void hostap_rx_sta_beacon(local_info_t *local, struct sk_buff *skb, | |
372 | int stype) | |
373 | { | |
374 | struct hostap_ieee80211_mgmt *mgmt; | |
375 | int left, chan = 0; | |
376 | u8 *pos; | |
377 | u8 *ssid = NULL, *wpa = NULL, *rsn = NULL; | |
378 | size_t ssid_len = 0, wpa_len = 0, rsn_len = 0; | |
379 | struct hostap_bss_info *bss; | |
380 | ||
381 | if (skb->len < IEEE80211_MGMT_HDR_LEN + sizeof(mgmt->u.beacon)) | |
382 | return; | |
383 | ||
384 | mgmt = (struct hostap_ieee80211_mgmt *) skb->data; | |
385 | pos = mgmt->u.beacon.variable; | |
386 | left = skb->len - (pos - skb->data); | |
387 | ||
388 | while (left >= 2) { | |
389 | if (2 + pos[1] > left) | |
390 | return; /* parse failed */ | |
391 | switch (*pos) { | |
392 | case WLAN_EID_SSID: | |
393 | ssid = pos + 2; | |
394 | ssid_len = pos[1]; | |
395 | break; | |
396 | case WLAN_EID_GENERIC: | |
397 | if (pos[1] >= 4 && | |
398 | pos[2] == 0x00 && pos[3] == 0x50 && | |
399 | pos[4] == 0xf2 && pos[5] == 1) { | |
400 | wpa = pos; | |
401 | wpa_len = pos[1] + 2; | |
402 | } | |
403 | break; | |
404 | case WLAN_EID_RSN: | |
405 | rsn = pos; | |
406 | rsn_len = pos[1] + 2; | |
407 | break; | |
408 | case WLAN_EID_DS_PARAMS: | |
409 | if (pos[1] >= 1) | |
410 | chan = pos[2]; | |
411 | break; | |
412 | } | |
413 | left -= 2 + pos[1]; | |
414 | pos += 2 + pos[1]; | |
415 | } | |
416 | ||
417 | if (wpa_len > MAX_WPA_IE_LEN) | |
418 | wpa_len = MAX_WPA_IE_LEN; | |
419 | if (rsn_len > MAX_WPA_IE_LEN) | |
420 | rsn_len = MAX_WPA_IE_LEN; | |
421 | if (ssid_len > sizeof(bss->ssid)) | |
422 | ssid_len = sizeof(bss->ssid); | |
423 | ||
424 | spin_lock(&local->lock); | |
425 | bss = __hostap_get_bss(local, mgmt->bssid, ssid, ssid_len); | |
426 | if (bss == NULL) | |
427 | bss = __hostap_add_bss(local, mgmt->bssid, ssid, ssid_len); | |
428 | if (bss) { | |
429 | bss->last_update = jiffies; | |
430 | bss->count++; | |
431 | bss->capab_info = le16_to_cpu(mgmt->u.beacon.capab_info); | |
432 | if (wpa) { | |
433 | memcpy(bss->wpa_ie, wpa, wpa_len); | |
434 | bss->wpa_ie_len = wpa_len; | |
435 | } else | |
436 | bss->wpa_ie_len = 0; | |
437 | if (rsn) { | |
438 | memcpy(bss->rsn_ie, rsn, rsn_len); | |
439 | bss->rsn_ie_len = rsn_len; | |
440 | } else | |
441 | bss->rsn_ie_len = 0; | |
442 | bss->chan = chan; | |
443 | } | |
444 | __hostap_expire_bss(local); | |
445 | spin_unlock(&local->lock); | |
446 | } | |
447 | ||
448 | ||
858119e1 | 449 | static int |
ff1d2767 JM |
450 | hostap_rx_frame_mgmt(local_info_t *local, struct sk_buff *skb, |
451 | struct hostap_80211_rx_status *rx_stats, u16 type, | |
452 | u16 stype) | |
453 | { | |
454 | if (local->iw_mode == IW_MODE_MASTER) { | |
d041674d | 455 | hostap_update_sta_ps(local, (struct ieee80211_hdr_4addr *) |
ff1d2767 JM |
456 | skb->data); |
457 | } | |
458 | ||
4339d328 JM |
459 | if (local->hostapd && type == IEEE80211_FTYPE_MGMT) { |
460 | if (stype == IEEE80211_STYPE_BEACON && | |
ff1d2767 JM |
461 | local->iw_mode == IW_MODE_MASTER) { |
462 | struct sk_buff *skb2; | |
463 | /* Process beacon frames also in kernel driver to | |
464 | * update STA(AP) table statistics */ | |
465 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
466 | if (skb2) | |
467 | hostap_rx(skb2->dev, skb2, rx_stats); | |
468 | } | |
469 | ||
470 | /* send management frames to the user space daemon for | |
471 | * processing */ | |
472 | local->apdevstats.rx_packets++; | |
473 | local->apdevstats.rx_bytes += skb->len; | |
474 | if (local->apdev == NULL) | |
475 | return -1; | |
476 | prism2_rx_80211(local->apdev, skb, rx_stats, PRISM2_RX_MGMT); | |
477 | return 0; | |
478 | } | |
479 | ||
480 | if (local->iw_mode == IW_MODE_MASTER) { | |
4339d328 JM |
481 | if (type != IEEE80211_FTYPE_MGMT && |
482 | type != IEEE80211_FTYPE_CTL) { | |
ff1d2767 JM |
483 | printk(KERN_DEBUG "%s: unknown management frame " |
484 | "(type=0x%02x, stype=0x%02x) dropped\n", | |
4339d328 | 485 | skb->dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
486 | return -1; |
487 | } | |
488 | ||
489 | hostap_rx(skb->dev, skb, rx_stats); | |
490 | return 0; | |
4339d328 JM |
491 | } else if (type == IEEE80211_FTYPE_MGMT && |
492 | (stype == IEEE80211_STYPE_BEACON || | |
493 | stype == IEEE80211_STYPE_PROBE_RESP)) { | |
ff1d2767 JM |
494 | hostap_rx_sta_beacon(local, skb, stype); |
495 | return -1; | |
4339d328 JM |
496 | } else if (type == IEEE80211_FTYPE_MGMT && |
497 | (stype == IEEE80211_STYPE_ASSOC_RESP || | |
498 | stype == IEEE80211_STYPE_REASSOC_RESP)) { | |
ff1d2767 JM |
499 | /* Ignore (Re)AssocResp silently since these are not currently |
500 | * needed but are still received when WPA/RSN mode is enabled. | |
501 | */ | |
502 | return -1; | |
503 | } else { | |
504 | printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: dropped unhandled" | |
505 | " management frame in non-Host AP mode (type=%d:%d)\n", | |
4339d328 | 506 | skb->dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
507 | return -1; |
508 | } | |
509 | } | |
510 | ||
511 | ||
512 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 513 | static struct net_device *prism2_rx_get_wds(local_info_t *local, |
ff1d2767 JM |
514 | u8 *addr) |
515 | { | |
516 | struct hostap_interface *iface = NULL; | |
517 | struct list_head *ptr; | |
518 | ||
519 | read_lock_bh(&local->iface_lock); | |
520 | list_for_each(ptr, &local->hostap_interfaces) { | |
521 | iface = list_entry(ptr, struct hostap_interface, list); | |
522 | if (iface->type == HOSTAP_INTERFACE_WDS && | |
523 | memcmp(iface->u.wds.remote_addr, addr, ETH_ALEN) == 0) | |
524 | break; | |
525 | iface = NULL; | |
526 | } | |
527 | read_unlock_bh(&local->iface_lock); | |
528 | ||
529 | return iface ? iface->dev : NULL; | |
530 | } | |
531 | ||
532 | ||
858119e1 | 533 | static int |
d041674d | 534 | hostap_rx_frame_wds(local_info_t *local, struct ieee80211_hdr_4addr *hdr, |
ff1d2767 JM |
535 | u16 fc, struct net_device **wds) |
536 | { | |
537 | /* FIX: is this really supposed to accept WDS frames only in Master | |
538 | * mode? What about Repeater or Managed with WDS frames? */ | |
b2f4a2e3 JM |
539 | if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) != |
540 | (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS) && | |
541 | (local->iw_mode != IW_MODE_MASTER || !(fc & IEEE80211_FCTL_TODS))) | |
ff1d2767 JM |
542 | return 0; /* not a WDS frame */ |
543 | ||
544 | /* Possible WDS frame: either IEEE 802.11 compliant (if FromDS) | |
545 | * or own non-standard frame with 4th address after payload */ | |
546 | if (memcmp(hdr->addr1, local->dev->dev_addr, ETH_ALEN) != 0 && | |
547 | (hdr->addr1[0] != 0xff || hdr->addr1[1] != 0xff || | |
548 | hdr->addr1[2] != 0xff || hdr->addr1[3] != 0xff || | |
549 | hdr->addr1[4] != 0xff || hdr->addr1[5] != 0xff)) { | |
550 | /* RA (or BSSID) is not ours - drop */ | |
551 | PDEBUG(DEBUG_EXTRA, "%s: received WDS frame with " | |
552 | "not own or broadcast %s=" MACSTR "\n", | |
b2f4a2e3 JM |
553 | local->dev->name, |
554 | fc & IEEE80211_FCTL_FROMDS ? "RA" : "BSSID", | |
ff1d2767 JM |
555 | MAC2STR(hdr->addr1)); |
556 | return -1; | |
557 | } | |
558 | ||
559 | /* check if the frame came from a registered WDS connection */ | |
560 | *wds = prism2_rx_get_wds(local, hdr->addr2); | |
b2f4a2e3 | 561 | if (*wds == NULL && fc & IEEE80211_FCTL_FROMDS && |
ff1d2767 JM |
562 | (local->iw_mode != IW_MODE_INFRA || |
563 | !(local->wds_type & HOSTAP_WDS_AP_CLIENT) || | |
564 | memcmp(hdr->addr2, local->bssid, ETH_ALEN) != 0)) { | |
565 | /* require that WDS link has been registered with TA or the | |
566 | * frame is from current AP when using 'AP client mode' */ | |
567 | PDEBUG(DEBUG_EXTRA, "%s: received WDS[4 addr] frame " | |
568 | "from unknown TA=" MACSTR "\n", | |
569 | local->dev->name, MAC2STR(hdr->addr2)); | |
570 | if (local->ap && local->ap->autom_ap_wds) | |
571 | hostap_wds_link_oper(local, hdr->addr2, WDS_ADD); | |
572 | return -1; | |
573 | } | |
574 | ||
b2f4a2e3 | 575 | if (*wds && !(fc & IEEE80211_FCTL_FROMDS) && local->ap && |
ff1d2767 JM |
576 | hostap_is_sta_assoc(local->ap, hdr->addr2)) { |
577 | /* STA is actually associated with us even though it has a | |
578 | * registered WDS link. Assume it is in 'AP client' mode. | |
579 | * Since this is a 3-addr frame, assume it is not (bogus) WDS | |
580 | * frame and process it like any normal ToDS frame from | |
581 | * associated STA. */ | |
582 | *wds = NULL; | |
583 | } | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
588 | ||
589 | static int hostap_is_eapol_frame(local_info_t *local, struct sk_buff *skb) | |
590 | { | |
591 | struct net_device *dev = local->dev; | |
592 | u16 fc, ethertype; | |
d041674d | 593 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
594 | u8 *pos; |
595 | ||
596 | if (skb->len < 24) | |
597 | return 0; | |
598 | ||
d041674d | 599 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
c0f72ca8 | 600 | fc = le16_to_cpu(hdr->frame_ctl); |
ff1d2767 JM |
601 | |
602 | /* check that the frame is unicast frame to us */ | |
b2f4a2e3 JM |
603 | if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
604 | IEEE80211_FCTL_TODS && | |
ff1d2767 JM |
605 | memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 && |
606 | memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) { | |
607 | /* ToDS frame with own addr BSSID and DA */ | |
b2f4a2e3 JM |
608 | } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
609 | IEEE80211_FCTL_FROMDS && | |
ff1d2767 JM |
610 | memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) { |
611 | /* FromDS frame with own addr as DA */ | |
612 | } else | |
613 | return 0; | |
614 | ||
615 | if (skb->len < 24 + 8) | |
616 | return 0; | |
617 | ||
618 | /* check for port access entity Ethernet type */ | |
619 | pos = skb->data + 24; | |
620 | ethertype = (pos[6] << 8) | pos[7]; | |
621 | if (ethertype == ETH_P_PAE) | |
622 | return 1; | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
627 | ||
628 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 629 | static int |
ff1d2767 | 630 | hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb, |
62fe7e37 | 631 | struct ieee80211_crypt_data *crypt) |
ff1d2767 | 632 | { |
d041674d | 633 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
634 | int res, hdrlen; |
635 | ||
636 | if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) | |
637 | return 0; | |
638 | ||
d041674d | 639 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
c0f72ca8 | 640 | hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); |
ff1d2767 JM |
641 | |
642 | if (local->tkip_countermeasures && | |
643 | strcmp(crypt->ops->name, "TKIP") == 0) { | |
644 | if (net_ratelimit()) { | |
645 | printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " | |
646 | "received packet from " MACSTR "\n", | |
647 | local->dev->name, MAC2STR(hdr->addr2)); | |
648 | } | |
649 | return -1; | |
650 | } | |
651 | ||
652 | atomic_inc(&crypt->refcnt); | |
653 | res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); | |
654 | atomic_dec(&crypt->refcnt); | |
655 | if (res < 0) { | |
656 | printk(KERN_DEBUG "%s: decryption failed (SA=" MACSTR | |
657 | ") res=%d\n", | |
658 | local->dev->name, MAC2STR(hdr->addr2), res); | |
659 | local->comm_tallies.rx_discards_wep_undecryptable++; | |
660 | return -1; | |
661 | } | |
662 | ||
663 | return res; | |
664 | } | |
665 | ||
666 | ||
667 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 668 | static int |
ff1d2767 | 669 | hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb, |
62fe7e37 | 670 | int keyidx, struct ieee80211_crypt_data *crypt) |
ff1d2767 | 671 | { |
d041674d | 672 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
673 | int res, hdrlen; |
674 | ||
675 | if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) | |
676 | return 0; | |
677 | ||
d041674d | 678 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
c0f72ca8 | 679 | hdrlen = hostap_80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); |
ff1d2767 JM |
680 | |
681 | atomic_inc(&crypt->refcnt); | |
682 | res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); | |
683 | atomic_dec(&crypt->refcnt); | |
684 | if (res < 0) { | |
685 | printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" | |
686 | " (SA=" MACSTR " keyidx=%d)\n", | |
687 | local->dev->name, MAC2STR(hdr->addr2), keyidx); | |
688 | return -1; | |
689 | } | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | ||
695 | /* All received frames are sent to this function. @skb contains the frame in | |
696 | * IEEE 802.11 format, i.e., in the format it was sent over air. | |
697 | * This function is called only as a tasklet (software IRQ). */ | |
698 | void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb, | |
699 | struct hostap_80211_rx_status *rx_stats) | |
700 | { | |
701 | struct hostap_interface *iface; | |
702 | local_info_t *local; | |
d041674d | 703 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
704 | size_t hdrlen; |
705 | u16 fc, type, stype, sc; | |
706 | struct net_device *wds = NULL; | |
707 | struct net_device_stats *stats; | |
708 | unsigned int frag; | |
709 | u8 *payload; | |
710 | struct sk_buff *skb2 = NULL; | |
711 | u16 ethertype; | |
712 | int frame_authorized = 0; | |
713 | int from_assoc_ap = 0; | |
714 | u8 dst[ETH_ALEN]; | |
715 | u8 src[ETH_ALEN]; | |
62fe7e37 | 716 | struct ieee80211_crypt_data *crypt = NULL; |
ff1d2767 JM |
717 | void *sta = NULL; |
718 | int keyidx = 0; | |
719 | ||
720 | iface = netdev_priv(dev); | |
721 | local = iface->local; | |
722 | iface->stats.rx_packets++; | |
723 | iface->stats.rx_bytes += skb->len; | |
724 | ||
725 | /* dev is the master radio device; change this to be the default | |
726 | * virtual interface (this may be changed to WDS device below) */ | |
727 | dev = local->ddev; | |
728 | iface = netdev_priv(dev); | |
729 | ||
d041674d | 730 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
ff1d2767 JM |
731 | stats = hostap_get_stats(dev); |
732 | ||
733 | if (skb->len < 10) | |
734 | goto rx_dropped; | |
735 | ||
c0f72ca8 | 736 | fc = le16_to_cpu(hdr->frame_ctl); |
4339d328 JM |
737 | type = WLAN_FC_GET_TYPE(fc); |
738 | stype = WLAN_FC_GET_STYPE(fc); | |
c0f72ca8 | 739 | sc = le16_to_cpu(hdr->seq_ctl); |
ff1d2767 JM |
740 | frag = WLAN_GET_SEQ_FRAG(sc); |
741 | hdrlen = hostap_80211_get_hdrlen(fc); | |
742 | ||
743 | /* Put this code here so that we avoid duplicating it in all | |
744 | * Rx paths. - Jean II */ | |
745 | #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ | |
746 | /* If spy monitoring on */ | |
747 | if (iface->spy_data.spy_number > 0) { | |
748 | struct iw_quality wstats; | |
749 | wstats.level = rx_stats->signal; | |
750 | wstats.noise = rx_stats->noise; | |
c28df16e JT |
751 | wstats.updated = IW_QUAL_LEVEL_UPDATED | IW_QUAL_NOISE_UPDATED |
752 | | IW_QUAL_QUAL_INVALID | IW_QUAL_DBM; | |
ff1d2767 JM |
753 | /* Update spy records */ |
754 | wireless_spy_update(dev, hdr->addr2, &wstats); | |
755 | } | |
756 | #endif /* IW_WIRELESS_SPY */ | |
757 | hostap_update_rx_stats(local->ap, hdr, rx_stats); | |
758 | ||
759 | if (local->iw_mode == IW_MODE_MONITOR) { | |
760 | monitor_rx(dev, skb, rx_stats); | |
761 | return; | |
762 | } | |
763 | ||
764 | if (local->host_decrypt) { | |
765 | int idx = 0; | |
766 | if (skb->len >= hdrlen + 3) | |
767 | idx = skb->data[hdrlen + 3] >> 6; | |
768 | crypt = local->crypt[idx]; | |
769 | sta = NULL; | |
770 | ||
771 | /* Use station specific key to override default keys if the | |
772 | * receiver address is a unicast address ("individual RA"). If | |
773 | * bcrx_sta_key parameter is set, station specific key is used | |
774 | * even with broad/multicast targets (this is against IEEE | |
775 | * 802.11, but makes it easier to use different keys with | |
776 | * stations that do not support WEP key mapping). */ | |
777 | ||
778 | if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key) | |
779 | (void) hostap_handle_sta_crypto(local, hdr, &crypt, | |
780 | &sta); | |
781 | ||
782 | /* allow NULL decrypt to indicate an station specific override | |
783 | * for default encryption */ | |
784 | if (crypt && (crypt->ops == NULL || | |
785 | crypt->ops->decrypt_mpdu == NULL)) | |
786 | crypt = NULL; | |
787 | ||
831a179f | 788 | if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) { |
ff1d2767 JM |
789 | #if 0 |
790 | /* This seems to be triggered by some (multicast?) | |
791 | * frames from other than current BSS, so just drop the | |
792 | * frames silently instead of filling system log with | |
793 | * these reports. */ | |
794 | printk(KERN_DEBUG "%s: WEP decryption failed (not set)" | |
795 | " (SA=" MACSTR ")\n", | |
796 | local->dev->name, MAC2STR(hdr->addr2)); | |
797 | #endif | |
798 | local->comm_tallies.rx_discards_wep_undecryptable++; | |
799 | goto rx_dropped; | |
800 | } | |
801 | } | |
802 | ||
4339d328 JM |
803 | if (type != IEEE80211_FTYPE_DATA) { |
804 | if (type == IEEE80211_FTYPE_MGMT && | |
805 | stype == IEEE80211_STYPE_AUTH && | |
831a179f | 806 | fc & IEEE80211_FCTL_PROTECTED && local->host_decrypt && |
ff1d2767 JM |
807 | (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0) |
808 | { | |
809 | printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " | |
810 | "from " MACSTR "\n", dev->name, | |
811 | MAC2STR(hdr->addr2)); | |
812 | /* TODO: could inform hostapd about this so that it | |
813 | * could send auth failure report */ | |
814 | goto rx_dropped; | |
815 | } | |
816 | ||
817 | if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype)) | |
818 | goto rx_dropped; | |
819 | else | |
820 | goto rx_exit; | |
821 | } | |
822 | ||
823 | /* Data frame - extract src/dst addresses */ | |
824 | if (skb->len < IEEE80211_DATA_HDR3_LEN) | |
825 | goto rx_dropped; | |
826 | ||
b2f4a2e3 JM |
827 | switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { |
828 | case IEEE80211_FCTL_FROMDS: | |
ff1d2767 JM |
829 | memcpy(dst, hdr->addr1, ETH_ALEN); |
830 | memcpy(src, hdr->addr3, ETH_ALEN); | |
831 | break; | |
b2f4a2e3 | 832 | case IEEE80211_FCTL_TODS: |
ff1d2767 JM |
833 | memcpy(dst, hdr->addr3, ETH_ALEN); |
834 | memcpy(src, hdr->addr2, ETH_ALEN); | |
835 | break; | |
b2f4a2e3 | 836 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: |
ff1d2767 JM |
837 | if (skb->len < IEEE80211_DATA_HDR4_LEN) |
838 | goto rx_dropped; | |
839 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
840 | memcpy(src, hdr->addr4, ETH_ALEN); | |
841 | break; | |
842 | case 0: | |
843 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
844 | memcpy(src, hdr->addr2, ETH_ALEN); | |
845 | break; | |
846 | } | |
847 | ||
848 | if (hostap_rx_frame_wds(local, hdr, fc, &wds)) | |
849 | goto rx_dropped; | |
850 | if (wds) { | |
851 | skb->dev = dev = wds; | |
852 | stats = hostap_get_stats(dev); | |
853 | } | |
854 | ||
855 | if (local->iw_mode == IW_MODE_MASTER && !wds && | |
b2f4a2e3 JM |
856 | (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
857 | IEEE80211_FCTL_FROMDS && | |
ff1d2767 JM |
858 | local->stadev && |
859 | memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) { | |
860 | /* Frame from BSSID of the AP for which we are a client */ | |
861 | skb->dev = dev = local->stadev; | |
862 | stats = hostap_get_stats(dev); | |
863 | from_assoc_ap = 1; | |
864 | } | |
865 | ||
866 | dev->last_rx = jiffies; | |
867 | ||
868 | if ((local->iw_mode == IW_MODE_MASTER || | |
869 | local->iw_mode == IW_MODE_REPEAT) && | |
870 | !from_assoc_ap) { | |
871 | switch (hostap_handle_sta_rx(local, dev, skb, rx_stats, | |
872 | wds != NULL)) { | |
873 | case AP_RX_CONTINUE_NOT_AUTHORIZED: | |
874 | frame_authorized = 0; | |
875 | break; | |
876 | case AP_RX_CONTINUE: | |
877 | frame_authorized = 1; | |
878 | break; | |
879 | case AP_RX_DROP: | |
880 | goto rx_dropped; | |
881 | case AP_RX_EXIT: | |
882 | goto rx_exit; | |
883 | } | |
884 | } | |
885 | ||
886 | /* Nullfunc frames may have PS-bit set, so they must be passed to | |
887 | * hostap_handle_sta_rx() before being dropped here. */ | |
4339d328 JM |
888 | if (stype != IEEE80211_STYPE_DATA && |
889 | stype != IEEE80211_STYPE_DATA_CFACK && | |
890 | stype != IEEE80211_STYPE_DATA_CFPOLL && | |
891 | stype != IEEE80211_STYPE_DATA_CFACKPOLL) { | |
892 | if (stype != IEEE80211_STYPE_NULLFUNC) | |
ff1d2767 JM |
893 | printk(KERN_DEBUG "%s: RX: dropped data frame " |
894 | "with no data (type=0x%02x, subtype=0x%02x)\n", | |
4339d328 | 895 | dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
896 | goto rx_dropped; |
897 | } | |
898 | ||
899 | /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ | |
900 | ||
831a179f | 901 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
902 | (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0) |
903 | goto rx_dropped; | |
d041674d | 904 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
ff1d2767 JM |
905 | |
906 | /* skb: hdr + (possibly fragmented) plaintext payload */ | |
907 | ||
831a179f | 908 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
b2f4a2e3 | 909 | (frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) { |
ff1d2767 JM |
910 | int flen; |
911 | struct sk_buff *frag_skb = | |
912 | prism2_frag_cache_get(local, hdr); | |
913 | if (!frag_skb) { | |
914 | printk(KERN_DEBUG "%s: Rx cannot get skb from " | |
915 | "fragment cache (morefrag=%d seq=%u frag=%u)\n", | |
b2f4a2e3 | 916 | dev->name, (fc & IEEE80211_FCTL_MOREFRAGS) != 0, |
ebed67d2 | 917 | WLAN_GET_SEQ_SEQ(sc) >> 4, frag); |
ff1d2767 JM |
918 | goto rx_dropped; |
919 | } | |
920 | ||
921 | flen = skb->len; | |
922 | if (frag != 0) | |
923 | flen -= hdrlen; | |
924 | ||
925 | if (frag_skb->tail + flen > frag_skb->end) { | |
926 | printk(KERN_WARNING "%s: host decrypted and " | |
927 | "reassembled frame did not fit skb\n", | |
928 | dev->name); | |
929 | prism2_frag_cache_invalidate(local, hdr); | |
930 | goto rx_dropped; | |
931 | } | |
932 | ||
933 | if (frag == 0) { | |
934 | /* copy first fragment (including full headers) into | |
935 | * beginning of the fragment cache skb */ | |
936 | memcpy(skb_put(frag_skb, flen), skb->data, flen); | |
937 | } else { | |
938 | /* append frame payload to the end of the fragment | |
939 | * cache skb */ | |
940 | memcpy(skb_put(frag_skb, flen), skb->data + hdrlen, | |
941 | flen); | |
942 | } | |
943 | dev_kfree_skb(skb); | |
944 | skb = NULL; | |
945 | ||
b2f4a2e3 | 946 | if (fc & IEEE80211_FCTL_MOREFRAGS) { |
ff1d2767 JM |
947 | /* more fragments expected - leave the skb in fragment |
948 | * cache for now; it will be delivered to upper layers | |
949 | * after all fragments have been received */ | |
950 | goto rx_exit; | |
951 | } | |
952 | ||
953 | /* this was the last fragment and the frame will be | |
954 | * delivered, so remove skb from fragment cache */ | |
955 | skb = frag_skb; | |
d041674d | 956 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
ff1d2767 JM |
957 | prism2_frag_cache_invalidate(local, hdr); |
958 | } | |
959 | ||
960 | /* skb: hdr + (possible reassembled) full MSDU payload; possibly still | |
961 | * encrypted/authenticated */ | |
962 | ||
831a179f | 963 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
964 | hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt)) |
965 | goto rx_dropped; | |
966 | ||
d041674d | 967 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
831a179f | 968 | if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !local->open_wep) { |
ff1d2767 JM |
969 | if (local->ieee_802_1x && |
970 | hostap_is_eapol_frame(local, skb)) { | |
971 | /* pass unencrypted EAPOL frames even if encryption is | |
972 | * configured */ | |
973 | PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing " | |
974 | "unencrypted EAPOL frame\n", local->dev->name); | |
975 | } else { | |
976 | printk(KERN_DEBUG "%s: encryption configured, but RX " | |
977 | "frame not encrypted (SA=" MACSTR ")\n", | |
978 | local->dev->name, MAC2STR(hdr->addr2)); | |
979 | goto rx_dropped; | |
980 | } | |
981 | } | |
982 | ||
831a179f | 983 | if (local->drop_unencrypted && !(fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
984 | !hostap_is_eapol_frame(local, skb)) { |
985 | if (net_ratelimit()) { | |
986 | printk(KERN_DEBUG "%s: dropped unencrypted RX data " | |
987 | "frame from " MACSTR " (drop_unencrypted=1)\n", | |
988 | dev->name, MAC2STR(hdr->addr2)); | |
989 | } | |
990 | goto rx_dropped; | |
991 | } | |
992 | ||
993 | /* skb: hdr + (possible reassembled) full plaintext payload */ | |
994 | ||
995 | payload = skb->data + hdrlen; | |
996 | ethertype = (payload[6] << 8) | payload[7]; | |
997 | ||
998 | /* If IEEE 802.1X is used, check whether the port is authorized to send | |
999 | * the received frame. */ | |
1000 | if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) { | |
1001 | if (ethertype == ETH_P_PAE) { | |
1002 | PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n", | |
1003 | dev->name); | |
1004 | if (local->hostapd && local->apdev) { | |
1005 | /* Send IEEE 802.1X frames to the user | |
1006 | * space daemon for processing */ | |
1007 | prism2_rx_80211(local->apdev, skb, rx_stats, | |
1008 | PRISM2_RX_MGMT); | |
1009 | local->apdevstats.rx_packets++; | |
1010 | local->apdevstats.rx_bytes += skb->len; | |
1011 | goto rx_exit; | |
1012 | } | |
1013 | } else if (!frame_authorized) { | |
1014 | printk(KERN_DEBUG "%s: dropped frame from " | |
1015 | "unauthorized port (IEEE 802.1X): " | |
1016 | "ethertype=0x%04x\n", | |
1017 | dev->name, ethertype); | |
1018 | goto rx_dropped; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | /* convert hdr + possible LLC headers into Ethernet header */ | |
1023 | if (skb->len - hdrlen >= 8 && | |
1024 | ((memcmp(payload, rfc1042_header, 6) == 0 && | |
1025 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1026 | memcmp(payload, bridge_tunnel_header, 6) == 0)) { | |
1027 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1028 | * replace EtherType */ | |
1029 | skb_pull(skb, hdrlen + 6); | |
1030 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1031 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1032 | } else { | |
1033 | u16 len; | |
1034 | /* Leave Ethernet header part of hdr and full payload */ | |
1035 | skb_pull(skb, hdrlen); | |
1036 | len = htons(skb->len); | |
1037 | memcpy(skb_push(skb, 2), &len, 2); | |
1038 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1039 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1040 | } | |
1041 | ||
b2f4a2e3 JM |
1042 | if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
1043 | IEEE80211_FCTL_TODS) && | |
ff1d2767 JM |
1044 | skb->len >= ETH_HLEN + ETH_ALEN) { |
1045 | /* Non-standard frame: get addr4 from its bogus location after | |
1046 | * the payload */ | |
1047 | memcpy(skb->data + ETH_ALEN, | |
1048 | skb->data + skb->len - ETH_ALEN, ETH_ALEN); | |
1049 | skb_trim(skb, skb->len - ETH_ALEN); | |
1050 | } | |
1051 | ||
1052 | stats->rx_packets++; | |
1053 | stats->rx_bytes += skb->len; | |
1054 | ||
1055 | if (local->iw_mode == IW_MODE_MASTER && !wds && | |
1056 | local->ap->bridge_packets) { | |
1057 | if (dst[0] & 0x01) { | |
1058 | /* copy multicast frame both to the higher layers and | |
1059 | * to the wireless media */ | |
1060 | local->ap->bridged_multicast++; | |
1061 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1062 | if (skb2 == NULL) | |
1063 | printk(KERN_DEBUG "%s: skb_clone failed for " | |
1064 | "multicast frame\n", dev->name); | |
1065 | } else if (hostap_is_sta_authorized(local->ap, dst)) { | |
1066 | /* send frame directly to the associated STA using | |
1067 | * wireless media and not passing to higher layers */ | |
1068 | local->ap->bridged_unicast++; | |
1069 | skb2 = skb; | |
1070 | skb = NULL; | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | if (skb2 != NULL) { | |
1075 | /* send to wireless media */ | |
459a98ed | 1076 | skb2->dev = dev; |
ff1d2767 | 1077 | skb2->protocol = __constant_htons(ETH_P_802_3); |
459a98ed | 1078 | skb_reset_mac_header(skb2); |
c1d2bbe1 | 1079 | skb_reset_network_header(skb2); |
b0e380b1 | 1080 | /* skb2->network_header += ETH_HLEN; */ |
ff1d2767 JM |
1081 | dev_queue_xmit(skb2); |
1082 | } | |
1083 | ||
1084 | if (skb) { | |
1085 | skb->protocol = eth_type_trans(skb, dev); | |
1086 | memset(skb->cb, 0, sizeof(skb->cb)); | |
ff1d2767 JM |
1087 | netif_rx(skb); |
1088 | } | |
1089 | ||
1090 | rx_exit: | |
1091 | if (sta) | |
1092 | hostap_handle_sta_release(sta); | |
1093 | return; | |
1094 | ||
1095 | rx_dropped: | |
1096 | dev_kfree_skb(skb); | |
1097 | ||
1098 | stats->rx_dropped++; | |
1099 | goto rx_exit; | |
1100 | } | |
1101 | ||
1102 | ||
1103 | EXPORT_SYMBOL(hostap_80211_rx); |