Commit | Line | Data |
---|---|---|
ff1d2767 | 1 | #include <linux/etherdevice.h> |
5a0e3ad6 | 2 | #include <linux/slab.h> |
ee40fa06 | 3 | #include <linux/export.h> |
274bfb8d | 4 | #include <net/lib80211.h> |
1ea893fd | 5 | #include <linux/if_arp.h> |
ff1d2767 JM |
6 | |
7 | #include "hostap_80211.h" | |
8 | #include "hostap.h" | |
5fad5a2e AB |
9 | #include "hostap_ap.h" |
10 | ||
11 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
12 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
13 | static unsigned char rfc1042_header[] = | |
14 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
15 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
16 | static unsigned char bridge_tunnel_header[] = | |
17 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
18 | /* No encapsulation header if EtherType < 0x600 (=length) */ | |
ff1d2767 JM |
19 | |
20 | void hostap_dump_rx_80211(const char *name, struct sk_buff *skb, | |
21 | struct hostap_80211_rx_status *rx_stats) | |
22 | { | |
1ea893fd | 23 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
24 | u16 fc; |
25 | ||
1ea893fd | 26 | hdr = (struct ieee80211_hdr *) skb->data; |
ff1d2767 JM |
27 | |
28 | printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d " | |
29 | "jiffies=%ld\n", | |
30 | name, rx_stats->signal, rx_stats->noise, rx_stats->rate, | |
31 | skb->len, jiffies); | |
32 | ||
33 | if (skb->len < 2) | |
34 | return; | |
35 | ||
1ea893fd | 36 | fc = le16_to_cpu(hdr->frame_control); |
ff1d2767 | 37 | printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s", |
1ea893fd DW |
38 | fc, (fc & IEEE80211_FCTL_FTYPE) >> 2, |
39 | (fc & IEEE80211_FCTL_STYPE) >> 4, | |
b2f4a2e3 JM |
40 | fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "", |
41 | fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : ""); | |
ff1d2767 JM |
42 | |
43 | if (skb->len < IEEE80211_DATA_HDR3_LEN) { | |
44 | printk("\n"); | |
45 | return; | |
46 | } | |
47 | ||
48 | printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id), | |
1ea893fd | 49 | le16_to_cpu(hdr->seq_ctrl)); |
ff1d2767 | 50 | |
e174961c JB |
51 | printk(KERN_DEBUG " A1=%pM", hdr->addr1); |
52 | printk(" A2=%pM", hdr->addr2); | |
53 | printk(" A3=%pM", hdr->addr3); | |
ff1d2767 | 54 | if (skb->len >= 30) |
e174961c | 55 | printk(" A4=%pM", hdr->addr4); |
ff1d2767 JM |
56 | printk("\n"); |
57 | } | |
58 | ||
59 | ||
60 | /* Send RX frame to netif with 802.11 (and possible prism) header. | |
61 | * Called from hardware or software IRQ context. */ | |
62 | int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb, | |
63 | struct hostap_80211_rx_status *rx_stats, int type) | |
64 | { | |
65 | struct hostap_interface *iface; | |
66 | local_info_t *local; | |
67 | int hdrlen, phdrlen, head_need, tail_need; | |
68 | u16 fc; | |
69 | int prism_header, ret; | |
1ea893fd | 70 | struct ieee80211_hdr *fhdr; |
ff1d2767 JM |
71 | |
72 | iface = netdev_priv(dev); | |
73 | local = iface->local; | |
ff1d2767 JM |
74 | |
75 | if (dev->type == ARPHRD_IEEE80211_PRISM) { | |
76 | if (local->monitor_type == PRISM2_MONITOR_PRISM) { | |
77 | prism_header = 1; | |
78 | phdrlen = sizeof(struct linux_wlan_ng_prism_hdr); | |
79 | } else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */ | |
80 | prism_header = 2; | |
81 | phdrlen = sizeof(struct linux_wlan_ng_cap_hdr); | |
82 | } | |
573b933f PR |
83 | } else if (dev->type == ARPHRD_IEEE80211_RADIOTAP) { |
84 | prism_header = 3; | |
85 | phdrlen = sizeof(struct hostap_radiotap_rx); | |
ff1d2767 JM |
86 | } else { |
87 | prism_header = 0; | |
88 | phdrlen = 0; | |
89 | } | |
90 | ||
1ea893fd DW |
91 | fhdr = (struct ieee80211_hdr *) skb->data; |
92 | fc = le16_to_cpu(fhdr->frame_control); | |
ff1d2767 | 93 | |
b2f4a2e3 | 94 | if (type == PRISM2_RX_MGMT && (fc & IEEE80211_FCTL_VERS)) { |
ff1d2767 | 95 | printk(KERN_DEBUG "%s: dropped management frame with header " |
b2f4a2e3 | 96 | "version %d\n", dev->name, fc & IEEE80211_FCTL_VERS); |
ff1d2767 JM |
97 | dev_kfree_skb_any(skb); |
98 | return 0; | |
99 | } | |
100 | ||
1ea893fd | 101 | hdrlen = hostap_80211_get_hdrlen(fhdr->frame_control); |
ff1d2767 JM |
102 | |
103 | /* check if there is enough room for extra data; if not, expand skb | |
104 | * buffer to be large enough for the changes */ | |
105 | head_need = phdrlen; | |
106 | tail_need = 0; | |
107 | #ifdef PRISM2_ADD_BOGUS_CRC | |
108 | tail_need += 4; | |
109 | #endif /* PRISM2_ADD_BOGUS_CRC */ | |
110 | ||
111 | head_need -= skb_headroom(skb); | |
112 | tail_need -= skb_tailroom(skb); | |
113 | ||
114 | if (head_need > 0 || tail_need > 0) { | |
115 | if (pskb_expand_head(skb, head_need > 0 ? head_need : 0, | |
116 | tail_need > 0 ? tail_need : 0, | |
117 | GFP_ATOMIC)) { | |
118 | printk(KERN_DEBUG "%s: prism2_rx_80211 failed to " | |
119 | "reallocate skb buffer\n", dev->name); | |
120 | dev_kfree_skb_any(skb); | |
121 | return 0; | |
122 | } | |
123 | } | |
124 | ||
125 | /* We now have an skb with enough head and tail room, so just insert | |
126 | * the extra data */ | |
127 | ||
128 | #ifdef PRISM2_ADD_BOGUS_CRC | |
129 | memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */ | |
130 | #endif /* PRISM2_ADD_BOGUS_CRC */ | |
131 | ||
132 | if (prism_header == 1) { | |
133 | struct linux_wlan_ng_prism_hdr *hdr; | |
134 | hdr = (struct linux_wlan_ng_prism_hdr *) | |
135 | skb_push(skb, phdrlen); | |
136 | memset(hdr, 0, phdrlen); | |
137 | hdr->msgcode = LWNG_CAP_DID_BASE; | |
138 | hdr->msglen = sizeof(*hdr); | |
139 | memcpy(hdr->devname, dev->name, sizeof(hdr->devname)); | |
140 | #define LWNG_SETVAL(f,i,s,l,d) \ | |
141 | hdr->f.did = LWNG_CAP_DID_BASE | (i << 12); \ | |
142 | hdr->f.status = s; hdr->f.len = l; hdr->f.data = d | |
143 | LWNG_SETVAL(hosttime, 1, 0, 4, jiffies); | |
3e1d3932 | 144 | LWNG_SETVAL(mactime, 2, 0, 4, rx_stats->mac_time); |
ff1d2767 JM |
145 | LWNG_SETVAL(channel, 3, 1 /* no value */, 4, 0); |
146 | LWNG_SETVAL(rssi, 4, 1 /* no value */, 4, 0); | |
147 | LWNG_SETVAL(sq, 5, 1 /* no value */, 4, 0); | |
148 | LWNG_SETVAL(signal, 6, 0, 4, rx_stats->signal); | |
149 | LWNG_SETVAL(noise, 7, 0, 4, rx_stats->noise); | |
150 | LWNG_SETVAL(rate, 8, 0, 4, rx_stats->rate / 5); | |
151 | LWNG_SETVAL(istx, 9, 0, 4, 0); | |
152 | LWNG_SETVAL(frmlen, 10, 0, 4, skb->len - phdrlen); | |
153 | #undef LWNG_SETVAL | |
154 | } else if (prism_header == 2) { | |
155 | struct linux_wlan_ng_cap_hdr *hdr; | |
156 | hdr = (struct linux_wlan_ng_cap_hdr *) | |
157 | skb_push(skb, phdrlen); | |
158 | memset(hdr, 0, phdrlen); | |
159 | hdr->version = htonl(LWNG_CAPHDR_VERSION); | |
160 | hdr->length = htonl(phdrlen); | |
161 | hdr->mactime = __cpu_to_be64(rx_stats->mac_time); | |
162 | hdr->hosttime = __cpu_to_be64(jiffies); | |
163 | hdr->phytype = htonl(4); /* dss_dot11_b */ | |
164 | hdr->channel = htonl(local->channel); | |
165 | hdr->datarate = htonl(rx_stats->rate); | |
166 | hdr->antenna = htonl(0); /* unknown */ | |
167 | hdr->priority = htonl(0); /* unknown */ | |
168 | hdr->ssi_type = htonl(3); /* raw */ | |
169 | hdr->ssi_signal = htonl(rx_stats->signal); | |
170 | hdr->ssi_noise = htonl(rx_stats->noise); | |
171 | hdr->preamble = htonl(0); /* unknown */ | |
172 | hdr->encoding = htonl(1); /* cck */ | |
573b933f PR |
173 | } else if (prism_header == 3) { |
174 | struct hostap_radiotap_rx *hdr; | |
175 | hdr = (struct hostap_radiotap_rx *)skb_push(skb, phdrlen); | |
176 | memset(hdr, 0, phdrlen); | |
177 | hdr->hdr.it_len = cpu_to_le16(phdrlen); | |
178 | hdr->hdr.it_present = | |
179 | cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) | | |
180 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
181 | (1 << IEEE80211_RADIOTAP_RATE) | | |
182 | (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) | | |
183 | (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE)); | |
184 | hdr->tsft = cpu_to_le64(rx_stats->mac_time); | |
185 | hdr->chan_freq = cpu_to_le16(freq_list[local->channel - 1]); | |
186 | hdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_CCK | | |
187 | IEEE80211_CHAN_2GHZ); | |
188 | hdr->rate = rx_stats->rate / 5; | |
189 | hdr->dbm_antsignal = rx_stats->signal; | |
190 | hdr->dbm_antnoise = rx_stats->noise; | |
ff1d2767 JM |
191 | } |
192 | ||
193 | ret = skb->len - phdrlen; | |
194 | skb->dev = dev; | |
459a98ed | 195 | skb_reset_mac_header(skb); |
ff1d2767 JM |
196 | skb_pull(skb, hdrlen); |
197 | if (prism_header) | |
198 | skb_pull(skb, phdrlen); | |
199 | skb->pkt_type = PACKET_OTHERHOST; | |
c1b4aa3f | 200 | skb->protocol = cpu_to_be16(ETH_P_802_2); |
ff1d2767 JM |
201 | memset(skb->cb, 0, sizeof(skb->cb)); |
202 | netif_rx(skb); | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
207 | ||
208 | /* Called only as a tasklet (software IRQ) */ | |
209 | static void monitor_rx(struct net_device *dev, struct sk_buff *skb, | |
210 | struct hostap_80211_rx_status *rx_stats) | |
211 | { | |
ff1d2767 JM |
212 | int len; |
213 | ||
214 | len = prism2_rx_80211(dev, skb, rx_stats, PRISM2_RX_MONITOR); | |
4cfa8e45 SH |
215 | dev->stats.rx_packets++; |
216 | dev->stats.rx_bytes += len; | |
ff1d2767 JM |
217 | } |
218 | ||
219 | ||
220 | /* Called only as a tasklet (software IRQ) */ | |
221 | static struct prism2_frag_entry * | |
222 | prism2_frag_cache_find(local_info_t *local, unsigned int seq, | |
223 | unsigned int frag, u8 *src, u8 *dst) | |
224 | { | |
225 | struct prism2_frag_entry *entry; | |
226 | int i; | |
227 | ||
228 | for (i = 0; i < PRISM2_FRAG_CACHE_LEN; i++) { | |
229 | entry = &local->frag_cache[i]; | |
230 | if (entry->skb != NULL && | |
231 | time_after(jiffies, entry->first_frag_time + 2 * HZ)) { | |
232 | printk(KERN_DEBUG "%s: expiring fragment cache entry " | |
233 | "seq=%u last_frag=%u\n", | |
234 | local->dev->name, entry->seq, entry->last_frag); | |
235 | dev_kfree_skb(entry->skb); | |
236 | entry->skb = NULL; | |
237 | } | |
238 | ||
239 | if (entry->skb != NULL && entry->seq == seq && | |
240 | (entry->last_frag + 1 == frag || frag == -1) && | |
241 | memcmp(entry->src_addr, src, ETH_ALEN) == 0 && | |
242 | memcmp(entry->dst_addr, dst, ETH_ALEN) == 0) | |
243 | return entry; | |
244 | } | |
245 | ||
246 | return NULL; | |
247 | } | |
248 | ||
249 | ||
250 | /* Called only as a tasklet (software IRQ) */ | |
251 | static struct sk_buff * | |
1ea893fd | 252 | prism2_frag_cache_get(local_info_t *local, struct ieee80211_hdr *hdr) |
ff1d2767 JM |
253 | { |
254 | struct sk_buff *skb = NULL; | |
255 | u16 sc; | |
256 | unsigned int frag, seq; | |
257 | struct prism2_frag_entry *entry; | |
258 | ||
1ea893fd DW |
259 | sc = le16_to_cpu(hdr->seq_ctrl); |
260 | frag = sc & IEEE80211_SCTL_FRAG; | |
261 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
ff1d2767 JM |
262 | |
263 | if (frag == 0) { | |
264 | /* Reserve enough space to fit maximum frame length */ | |
265 | skb = dev_alloc_skb(local->dev->mtu + | |
1ea893fd | 266 | sizeof(struct ieee80211_hdr) + |
ff1d2767 JM |
267 | 8 /* LLC */ + |
268 | 2 /* alignment */ + | |
269 | 8 /* WEP */ + ETH_ALEN /* WDS */); | |
270 | if (skb == NULL) | |
271 | return NULL; | |
272 | ||
273 | entry = &local->frag_cache[local->frag_next_idx]; | |
274 | local->frag_next_idx++; | |
275 | if (local->frag_next_idx >= PRISM2_FRAG_CACHE_LEN) | |
276 | local->frag_next_idx = 0; | |
277 | ||
278 | if (entry->skb != NULL) | |
279 | dev_kfree_skb(entry->skb); | |
280 | ||
281 | entry->first_frag_time = jiffies; | |
282 | entry->seq = seq; | |
283 | entry->last_frag = frag; | |
284 | entry->skb = skb; | |
285 | memcpy(entry->src_addr, hdr->addr2, ETH_ALEN); | |
286 | memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN); | |
287 | } else { | |
288 | /* received a fragment of a frame for which the head fragment | |
289 | * should have already been received */ | |
290 | entry = prism2_frag_cache_find(local, seq, frag, hdr->addr2, | |
291 | hdr->addr1); | |
292 | if (entry != NULL) { | |
293 | entry->last_frag = frag; | |
294 | skb = entry->skb; | |
295 | } | |
296 | } | |
297 | ||
298 | return skb; | |
299 | } | |
300 | ||
301 | ||
302 | /* Called only as a tasklet (software IRQ) */ | |
303 | static int prism2_frag_cache_invalidate(local_info_t *local, | |
1ea893fd | 304 | struct ieee80211_hdr *hdr) |
ff1d2767 JM |
305 | { |
306 | u16 sc; | |
307 | unsigned int seq; | |
308 | struct prism2_frag_entry *entry; | |
309 | ||
1ea893fd DW |
310 | sc = le16_to_cpu(hdr->seq_ctrl); |
311 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
ff1d2767 JM |
312 | |
313 | entry = prism2_frag_cache_find(local, seq, -1, hdr->addr2, hdr->addr1); | |
314 | ||
315 | if (entry == NULL) { | |
316 | printk(KERN_DEBUG "%s: could not invalidate fragment cache " | |
317 | "entry (seq=%u)\n", | |
318 | local->dev->name, seq); | |
319 | return -1; | |
320 | } | |
321 | ||
322 | entry->skb = NULL; | |
323 | return 0; | |
324 | } | |
325 | ||
326 | ||
327 | static struct hostap_bss_info *__hostap_get_bss(local_info_t *local, u8 *bssid, | |
328 | u8 *ssid, size_t ssid_len) | |
329 | { | |
330 | struct list_head *ptr; | |
331 | struct hostap_bss_info *bss; | |
332 | ||
333 | list_for_each(ptr, &local->bss_list) { | |
334 | bss = list_entry(ptr, struct hostap_bss_info, list); | |
335 | if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && | |
336 | (ssid == NULL || | |
337 | (ssid_len == bss->ssid_len && | |
338 | memcmp(ssid, bss->ssid, ssid_len) == 0))) { | |
339 | list_move(&bss->list, &local->bss_list); | |
340 | return bss; | |
341 | } | |
342 | } | |
343 | ||
344 | return NULL; | |
345 | } | |
346 | ||
347 | ||
348 | static struct hostap_bss_info *__hostap_add_bss(local_info_t *local, u8 *bssid, | |
349 | u8 *ssid, size_t ssid_len) | |
350 | { | |
351 | struct hostap_bss_info *bss; | |
352 | ||
353 | if (local->num_bss_info >= HOSTAP_MAX_BSS_COUNT) { | |
354 | bss = list_entry(local->bss_list.prev, | |
355 | struct hostap_bss_info, list); | |
356 | list_del(&bss->list); | |
357 | local->num_bss_info--; | |
358 | } else { | |
aca8c6fa | 359 | bss = kmalloc(sizeof(*bss), GFP_ATOMIC); |
ff1d2767 JM |
360 | if (bss == NULL) |
361 | return NULL; | |
362 | } | |
363 | ||
364 | memset(bss, 0, sizeof(*bss)); | |
365 | memcpy(bss->bssid, bssid, ETH_ALEN); | |
366 | memcpy(bss->ssid, ssid, ssid_len); | |
367 | bss->ssid_len = ssid_len; | |
368 | local->num_bss_info++; | |
369 | list_add(&bss->list, &local->bss_list); | |
370 | return bss; | |
371 | } | |
372 | ||
373 | ||
374 | static void __hostap_expire_bss(local_info_t *local) | |
375 | { | |
376 | struct hostap_bss_info *bss; | |
377 | ||
378 | while (local->num_bss_info > 0) { | |
379 | bss = list_entry(local->bss_list.prev, | |
380 | struct hostap_bss_info, list); | |
381 | if (!time_after(jiffies, bss->last_update + 60 * HZ)) | |
382 | break; | |
383 | ||
384 | list_del(&bss->list); | |
385 | local->num_bss_info--; | |
386 | kfree(bss); | |
387 | } | |
388 | } | |
389 | ||
390 | ||
391 | /* Both IEEE 802.11 Beacon and Probe Response frames have similar structure, so | |
392 | * the same routine can be used to parse both of them. */ | |
393 | static void hostap_rx_sta_beacon(local_info_t *local, struct sk_buff *skb, | |
394 | int stype) | |
395 | { | |
396 | struct hostap_ieee80211_mgmt *mgmt; | |
397 | int left, chan = 0; | |
398 | u8 *pos; | |
399 | u8 *ssid = NULL, *wpa = NULL, *rsn = NULL; | |
400 | size_t ssid_len = 0, wpa_len = 0, rsn_len = 0; | |
401 | struct hostap_bss_info *bss; | |
402 | ||
403 | if (skb->len < IEEE80211_MGMT_HDR_LEN + sizeof(mgmt->u.beacon)) | |
404 | return; | |
405 | ||
406 | mgmt = (struct hostap_ieee80211_mgmt *) skb->data; | |
407 | pos = mgmt->u.beacon.variable; | |
408 | left = skb->len - (pos - skb->data); | |
409 | ||
410 | while (left >= 2) { | |
411 | if (2 + pos[1] > left) | |
412 | return; /* parse failed */ | |
413 | switch (*pos) { | |
414 | case WLAN_EID_SSID: | |
415 | ssid = pos + 2; | |
416 | ssid_len = pos[1]; | |
417 | break; | |
418 | case WLAN_EID_GENERIC: | |
419 | if (pos[1] >= 4 && | |
420 | pos[2] == 0x00 && pos[3] == 0x50 && | |
421 | pos[4] == 0xf2 && pos[5] == 1) { | |
422 | wpa = pos; | |
423 | wpa_len = pos[1] + 2; | |
424 | } | |
425 | break; | |
426 | case WLAN_EID_RSN: | |
427 | rsn = pos; | |
428 | rsn_len = pos[1] + 2; | |
429 | break; | |
430 | case WLAN_EID_DS_PARAMS: | |
431 | if (pos[1] >= 1) | |
432 | chan = pos[2]; | |
433 | break; | |
434 | } | |
435 | left -= 2 + pos[1]; | |
436 | pos += 2 + pos[1]; | |
437 | } | |
438 | ||
439 | if (wpa_len > MAX_WPA_IE_LEN) | |
440 | wpa_len = MAX_WPA_IE_LEN; | |
441 | if (rsn_len > MAX_WPA_IE_LEN) | |
442 | rsn_len = MAX_WPA_IE_LEN; | |
443 | if (ssid_len > sizeof(bss->ssid)) | |
444 | ssid_len = sizeof(bss->ssid); | |
445 | ||
446 | spin_lock(&local->lock); | |
447 | bss = __hostap_get_bss(local, mgmt->bssid, ssid, ssid_len); | |
448 | if (bss == NULL) | |
449 | bss = __hostap_add_bss(local, mgmt->bssid, ssid, ssid_len); | |
450 | if (bss) { | |
451 | bss->last_update = jiffies; | |
452 | bss->count++; | |
453 | bss->capab_info = le16_to_cpu(mgmt->u.beacon.capab_info); | |
454 | if (wpa) { | |
455 | memcpy(bss->wpa_ie, wpa, wpa_len); | |
456 | bss->wpa_ie_len = wpa_len; | |
457 | } else | |
458 | bss->wpa_ie_len = 0; | |
459 | if (rsn) { | |
460 | memcpy(bss->rsn_ie, rsn, rsn_len); | |
461 | bss->rsn_ie_len = rsn_len; | |
462 | } else | |
463 | bss->rsn_ie_len = 0; | |
464 | bss->chan = chan; | |
465 | } | |
466 | __hostap_expire_bss(local); | |
467 | spin_unlock(&local->lock); | |
468 | } | |
469 | ||
470 | ||
858119e1 | 471 | static int |
ff1d2767 JM |
472 | hostap_rx_frame_mgmt(local_info_t *local, struct sk_buff *skb, |
473 | struct hostap_80211_rx_status *rx_stats, u16 type, | |
474 | u16 stype) | |
475 | { | |
1ea893fd DW |
476 | if (local->iw_mode == IW_MODE_MASTER) |
477 | hostap_update_sta_ps(local, (struct ieee80211_hdr *) skb->data); | |
ff1d2767 | 478 | |
4339d328 JM |
479 | if (local->hostapd && type == IEEE80211_FTYPE_MGMT) { |
480 | if (stype == IEEE80211_STYPE_BEACON && | |
ff1d2767 JM |
481 | local->iw_mode == IW_MODE_MASTER) { |
482 | struct sk_buff *skb2; | |
483 | /* Process beacon frames also in kernel driver to | |
484 | * update STA(AP) table statistics */ | |
485 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
486 | if (skb2) | |
487 | hostap_rx(skb2->dev, skb2, rx_stats); | |
488 | } | |
489 | ||
490 | /* send management frames to the user space daemon for | |
491 | * processing */ | |
492 | local->apdevstats.rx_packets++; | |
493 | local->apdevstats.rx_bytes += skb->len; | |
494 | if (local->apdev == NULL) | |
495 | return -1; | |
496 | prism2_rx_80211(local->apdev, skb, rx_stats, PRISM2_RX_MGMT); | |
497 | return 0; | |
498 | } | |
499 | ||
500 | if (local->iw_mode == IW_MODE_MASTER) { | |
4339d328 JM |
501 | if (type != IEEE80211_FTYPE_MGMT && |
502 | type != IEEE80211_FTYPE_CTL) { | |
ff1d2767 JM |
503 | printk(KERN_DEBUG "%s: unknown management frame " |
504 | "(type=0x%02x, stype=0x%02x) dropped\n", | |
4339d328 | 505 | skb->dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
506 | return -1; |
507 | } | |
508 | ||
509 | hostap_rx(skb->dev, skb, rx_stats); | |
510 | return 0; | |
4339d328 JM |
511 | } else if (type == IEEE80211_FTYPE_MGMT && |
512 | (stype == IEEE80211_STYPE_BEACON || | |
513 | stype == IEEE80211_STYPE_PROBE_RESP)) { | |
ff1d2767 JM |
514 | hostap_rx_sta_beacon(local, skb, stype); |
515 | return -1; | |
4339d328 JM |
516 | } else if (type == IEEE80211_FTYPE_MGMT && |
517 | (stype == IEEE80211_STYPE_ASSOC_RESP || | |
518 | stype == IEEE80211_STYPE_REASSOC_RESP)) { | |
ff1d2767 JM |
519 | /* Ignore (Re)AssocResp silently since these are not currently |
520 | * needed but are still received when WPA/RSN mode is enabled. | |
521 | */ | |
522 | return -1; | |
523 | } else { | |
524 | printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: dropped unhandled" | |
525 | " management frame in non-Host AP mode (type=%d:%d)\n", | |
4339d328 | 526 | skb->dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
527 | return -1; |
528 | } | |
529 | } | |
530 | ||
531 | ||
532 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 533 | static struct net_device *prism2_rx_get_wds(local_info_t *local, |
ff1d2767 JM |
534 | u8 *addr) |
535 | { | |
536 | struct hostap_interface *iface = NULL; | |
537 | struct list_head *ptr; | |
538 | ||
539 | read_lock_bh(&local->iface_lock); | |
540 | list_for_each(ptr, &local->hostap_interfaces) { | |
541 | iface = list_entry(ptr, struct hostap_interface, list); | |
542 | if (iface->type == HOSTAP_INTERFACE_WDS && | |
543 | memcmp(iface->u.wds.remote_addr, addr, ETH_ALEN) == 0) | |
544 | break; | |
545 | iface = NULL; | |
546 | } | |
547 | read_unlock_bh(&local->iface_lock); | |
548 | ||
549 | return iface ? iface->dev : NULL; | |
550 | } | |
551 | ||
552 | ||
858119e1 | 553 | static int |
1ea893fd DW |
554 | hostap_rx_frame_wds(local_info_t *local, struct ieee80211_hdr *hdr, u16 fc, |
555 | struct net_device **wds) | |
ff1d2767 JM |
556 | { |
557 | /* FIX: is this really supposed to accept WDS frames only in Master | |
558 | * mode? What about Repeater or Managed with WDS frames? */ | |
b2f4a2e3 JM |
559 | if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) != |
560 | (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS) && | |
561 | (local->iw_mode != IW_MODE_MASTER || !(fc & IEEE80211_FCTL_TODS))) | |
ff1d2767 JM |
562 | return 0; /* not a WDS frame */ |
563 | ||
564 | /* Possible WDS frame: either IEEE 802.11 compliant (if FromDS) | |
565 | * or own non-standard frame with 4th address after payload */ | |
566 | if (memcmp(hdr->addr1, local->dev->dev_addr, ETH_ALEN) != 0 && | |
567 | (hdr->addr1[0] != 0xff || hdr->addr1[1] != 0xff || | |
568 | hdr->addr1[2] != 0xff || hdr->addr1[3] != 0xff || | |
569 | hdr->addr1[4] != 0xff || hdr->addr1[5] != 0xff)) { | |
570 | /* RA (or BSSID) is not ours - drop */ | |
15ea0ebc | 571 | PDEBUG(DEBUG_EXTRA2, "%s: received WDS frame with " |
e174961c | 572 | "not own or broadcast %s=%pM\n", |
b2f4a2e3 JM |
573 | local->dev->name, |
574 | fc & IEEE80211_FCTL_FROMDS ? "RA" : "BSSID", | |
e174961c | 575 | hdr->addr1); |
ff1d2767 JM |
576 | return -1; |
577 | } | |
578 | ||
579 | /* check if the frame came from a registered WDS connection */ | |
580 | *wds = prism2_rx_get_wds(local, hdr->addr2); | |
b2f4a2e3 | 581 | if (*wds == NULL && fc & IEEE80211_FCTL_FROMDS && |
ff1d2767 JM |
582 | (local->iw_mode != IW_MODE_INFRA || |
583 | !(local->wds_type & HOSTAP_WDS_AP_CLIENT) || | |
584 | memcmp(hdr->addr2, local->bssid, ETH_ALEN) != 0)) { | |
585 | /* require that WDS link has been registered with TA or the | |
586 | * frame is from current AP when using 'AP client mode' */ | |
587 | PDEBUG(DEBUG_EXTRA, "%s: received WDS[4 addr] frame " | |
e174961c JB |
588 | "from unknown TA=%pM\n", |
589 | local->dev->name, hdr->addr2); | |
ff1d2767 JM |
590 | if (local->ap && local->ap->autom_ap_wds) |
591 | hostap_wds_link_oper(local, hdr->addr2, WDS_ADD); | |
592 | return -1; | |
593 | } | |
594 | ||
b2f4a2e3 | 595 | if (*wds && !(fc & IEEE80211_FCTL_FROMDS) && local->ap && |
ff1d2767 JM |
596 | hostap_is_sta_assoc(local->ap, hdr->addr2)) { |
597 | /* STA is actually associated with us even though it has a | |
598 | * registered WDS link. Assume it is in 'AP client' mode. | |
599 | * Since this is a 3-addr frame, assume it is not (bogus) WDS | |
600 | * frame and process it like any normal ToDS frame from | |
601 | * associated STA. */ | |
602 | *wds = NULL; | |
603 | } | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
608 | ||
609 | static int hostap_is_eapol_frame(local_info_t *local, struct sk_buff *skb) | |
610 | { | |
611 | struct net_device *dev = local->dev; | |
612 | u16 fc, ethertype; | |
1ea893fd | 613 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
614 | u8 *pos; |
615 | ||
616 | if (skb->len < 24) | |
617 | return 0; | |
618 | ||
1ea893fd DW |
619 | hdr = (struct ieee80211_hdr *) skb->data; |
620 | fc = le16_to_cpu(hdr->frame_control); | |
ff1d2767 JM |
621 | |
622 | /* check that the frame is unicast frame to us */ | |
b2f4a2e3 JM |
623 | if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
624 | IEEE80211_FCTL_TODS && | |
ff1d2767 JM |
625 | memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 && |
626 | memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) { | |
627 | /* ToDS frame with own addr BSSID and DA */ | |
b2f4a2e3 JM |
628 | } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
629 | IEEE80211_FCTL_FROMDS && | |
ff1d2767 JM |
630 | memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) { |
631 | /* FromDS frame with own addr as DA */ | |
632 | } else | |
633 | return 0; | |
634 | ||
635 | if (skb->len < 24 + 8) | |
636 | return 0; | |
637 | ||
638 | /* check for port access entity Ethernet type */ | |
639 | pos = skb->data + 24; | |
640 | ethertype = (pos[6] << 8) | pos[7]; | |
641 | if (ethertype == ETH_P_PAE) | |
642 | return 1; | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
647 | ||
648 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 649 | static int |
ff1d2767 | 650 | hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb, |
274bfb8d | 651 | struct lib80211_crypt_data *crypt) |
ff1d2767 | 652 | { |
1ea893fd | 653 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
654 | int res, hdrlen; |
655 | ||
656 | if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) | |
657 | return 0; | |
658 | ||
1ea893fd DW |
659 | hdr = (struct ieee80211_hdr *) skb->data; |
660 | hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); | |
ff1d2767 JM |
661 | |
662 | if (local->tkip_countermeasures && | |
663 | strcmp(crypt->ops->name, "TKIP") == 0) { | |
664 | if (net_ratelimit()) { | |
665 | printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " | |
e174961c JB |
666 | "received packet from %pM\n", |
667 | local->dev->name, hdr->addr2); | |
ff1d2767 JM |
668 | } |
669 | return -1; | |
670 | } | |
671 | ||
672 | atomic_inc(&crypt->refcnt); | |
673 | res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); | |
674 | atomic_dec(&crypt->refcnt); | |
675 | if (res < 0) { | |
e174961c JB |
676 | printk(KERN_DEBUG "%s: decryption failed (SA=%pM) res=%d\n", |
677 | local->dev->name, hdr->addr2, res); | |
ff1d2767 JM |
678 | local->comm_tallies.rx_discards_wep_undecryptable++; |
679 | return -1; | |
680 | } | |
681 | ||
682 | return res; | |
683 | } | |
684 | ||
685 | ||
686 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 687 | static int |
ff1d2767 | 688 | hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb, |
274bfb8d | 689 | int keyidx, struct lib80211_crypt_data *crypt) |
ff1d2767 | 690 | { |
1ea893fd | 691 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
692 | int res, hdrlen; |
693 | ||
694 | if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) | |
695 | return 0; | |
696 | ||
1ea893fd DW |
697 | hdr = (struct ieee80211_hdr *) skb->data; |
698 | hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); | |
ff1d2767 JM |
699 | |
700 | atomic_inc(&crypt->refcnt); | |
701 | res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); | |
702 | atomic_dec(&crypt->refcnt); | |
703 | if (res < 0) { | |
704 | printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" | |
e174961c JB |
705 | " (SA=%pM keyidx=%d)\n", |
706 | local->dev->name, hdr->addr2, keyidx); | |
ff1d2767 JM |
707 | return -1; |
708 | } | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
713 | ||
714 | /* All received frames are sent to this function. @skb contains the frame in | |
715 | * IEEE 802.11 format, i.e., in the format it was sent over air. | |
716 | * This function is called only as a tasklet (software IRQ). */ | |
717 | void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb, | |
718 | struct hostap_80211_rx_status *rx_stats) | |
719 | { | |
720 | struct hostap_interface *iface; | |
721 | local_info_t *local; | |
1ea893fd | 722 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
723 | size_t hdrlen; |
724 | u16 fc, type, stype, sc; | |
725 | struct net_device *wds = NULL; | |
ff1d2767 JM |
726 | unsigned int frag; |
727 | u8 *payload; | |
728 | struct sk_buff *skb2 = NULL; | |
729 | u16 ethertype; | |
730 | int frame_authorized = 0; | |
731 | int from_assoc_ap = 0; | |
732 | u8 dst[ETH_ALEN]; | |
733 | u8 src[ETH_ALEN]; | |
274bfb8d | 734 | struct lib80211_crypt_data *crypt = NULL; |
ff1d2767 JM |
735 | void *sta = NULL; |
736 | int keyidx = 0; | |
737 | ||
738 | iface = netdev_priv(dev); | |
739 | local = iface->local; | |
740 | iface->stats.rx_packets++; | |
741 | iface->stats.rx_bytes += skb->len; | |
742 | ||
743 | /* dev is the master radio device; change this to be the default | |
744 | * virtual interface (this may be changed to WDS device below) */ | |
745 | dev = local->ddev; | |
746 | iface = netdev_priv(dev); | |
747 | ||
1ea893fd | 748 | hdr = (struct ieee80211_hdr *) skb->data; |
ff1d2767 JM |
749 | |
750 | if (skb->len < 10) | |
751 | goto rx_dropped; | |
752 | ||
1ea893fd DW |
753 | fc = le16_to_cpu(hdr->frame_control); |
754 | type = fc & IEEE80211_FCTL_FTYPE; | |
755 | stype = fc & IEEE80211_FCTL_STYPE; | |
756 | sc = le16_to_cpu(hdr->seq_ctrl); | |
757 | frag = sc & IEEE80211_SCTL_FRAG; | |
758 | hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); | |
ff1d2767 JM |
759 | |
760 | /* Put this code here so that we avoid duplicating it in all | |
761 | * Rx paths. - Jean II */ | |
762 | #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ | |
763 | /* If spy monitoring on */ | |
764 | if (iface->spy_data.spy_number > 0) { | |
765 | struct iw_quality wstats; | |
766 | wstats.level = rx_stats->signal; | |
767 | wstats.noise = rx_stats->noise; | |
c28df16e JT |
768 | wstats.updated = IW_QUAL_LEVEL_UPDATED | IW_QUAL_NOISE_UPDATED |
769 | | IW_QUAL_QUAL_INVALID | IW_QUAL_DBM; | |
ff1d2767 JM |
770 | /* Update spy records */ |
771 | wireless_spy_update(dev, hdr->addr2, &wstats); | |
772 | } | |
773 | #endif /* IW_WIRELESS_SPY */ | |
774 | hostap_update_rx_stats(local->ap, hdr, rx_stats); | |
775 | ||
776 | if (local->iw_mode == IW_MODE_MONITOR) { | |
777 | monitor_rx(dev, skb, rx_stats); | |
778 | return; | |
779 | } | |
780 | ||
781 | if (local->host_decrypt) { | |
782 | int idx = 0; | |
783 | if (skb->len >= hdrlen + 3) | |
784 | idx = skb->data[hdrlen + 3] >> 6; | |
274bfb8d | 785 | crypt = local->crypt_info.crypt[idx]; |
ff1d2767 JM |
786 | sta = NULL; |
787 | ||
788 | /* Use station specific key to override default keys if the | |
789 | * receiver address is a unicast address ("individual RA"). If | |
790 | * bcrx_sta_key parameter is set, station specific key is used | |
791 | * even with broad/multicast targets (this is against IEEE | |
792 | * 802.11, but makes it easier to use different keys with | |
793 | * stations that do not support WEP key mapping). */ | |
794 | ||
795 | if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key) | |
796 | (void) hostap_handle_sta_crypto(local, hdr, &crypt, | |
797 | &sta); | |
798 | ||
799 | /* allow NULL decrypt to indicate an station specific override | |
800 | * for default encryption */ | |
801 | if (crypt && (crypt->ops == NULL || | |
802 | crypt->ops->decrypt_mpdu == NULL)) | |
803 | crypt = NULL; | |
804 | ||
831a179f | 805 | if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) { |
ff1d2767 JM |
806 | #if 0 |
807 | /* This seems to be triggered by some (multicast?) | |
808 | * frames from other than current BSS, so just drop the | |
809 | * frames silently instead of filling system log with | |
810 | * these reports. */ | |
811 | printk(KERN_DEBUG "%s: WEP decryption failed (not set)" | |
e174961c JB |
812 | " (SA=%pM)\n", |
813 | local->dev->name, hdr->addr2); | |
ff1d2767 JM |
814 | #endif |
815 | local->comm_tallies.rx_discards_wep_undecryptable++; | |
816 | goto rx_dropped; | |
817 | } | |
818 | } | |
819 | ||
4339d328 JM |
820 | if (type != IEEE80211_FTYPE_DATA) { |
821 | if (type == IEEE80211_FTYPE_MGMT && | |
822 | stype == IEEE80211_STYPE_AUTH && | |
831a179f | 823 | fc & IEEE80211_FCTL_PROTECTED && local->host_decrypt && |
ff1d2767 JM |
824 | (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0) |
825 | { | |
826 | printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " | |
e174961c | 827 | "from %pM\n", dev->name, hdr->addr2); |
ff1d2767 JM |
828 | /* TODO: could inform hostapd about this so that it |
829 | * could send auth failure report */ | |
830 | goto rx_dropped; | |
831 | } | |
832 | ||
833 | if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype)) | |
834 | goto rx_dropped; | |
835 | else | |
836 | goto rx_exit; | |
837 | } | |
838 | ||
839 | /* Data frame - extract src/dst addresses */ | |
840 | if (skb->len < IEEE80211_DATA_HDR3_LEN) | |
841 | goto rx_dropped; | |
842 | ||
b2f4a2e3 JM |
843 | switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { |
844 | case IEEE80211_FCTL_FROMDS: | |
ff1d2767 JM |
845 | memcpy(dst, hdr->addr1, ETH_ALEN); |
846 | memcpy(src, hdr->addr3, ETH_ALEN); | |
847 | break; | |
b2f4a2e3 | 848 | case IEEE80211_FCTL_TODS: |
ff1d2767 JM |
849 | memcpy(dst, hdr->addr3, ETH_ALEN); |
850 | memcpy(src, hdr->addr2, ETH_ALEN); | |
851 | break; | |
b2f4a2e3 | 852 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: |
ff1d2767 JM |
853 | if (skb->len < IEEE80211_DATA_HDR4_LEN) |
854 | goto rx_dropped; | |
855 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
856 | memcpy(src, hdr->addr4, ETH_ALEN); | |
857 | break; | |
858 | case 0: | |
859 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
860 | memcpy(src, hdr->addr2, ETH_ALEN); | |
861 | break; | |
862 | } | |
863 | ||
864 | if (hostap_rx_frame_wds(local, hdr, fc, &wds)) | |
865 | goto rx_dropped; | |
4cfa8e45 | 866 | if (wds) |
ff1d2767 | 867 | skb->dev = dev = wds; |
ff1d2767 JM |
868 | |
869 | if (local->iw_mode == IW_MODE_MASTER && !wds && | |
b2f4a2e3 JM |
870 | (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
871 | IEEE80211_FCTL_FROMDS && | |
ff1d2767 JM |
872 | local->stadev && |
873 | memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) { | |
874 | /* Frame from BSSID of the AP for which we are a client */ | |
875 | skb->dev = dev = local->stadev; | |
ff1d2767 JM |
876 | from_assoc_ap = 1; |
877 | } | |
878 | ||
ff1d2767 JM |
879 | if ((local->iw_mode == IW_MODE_MASTER || |
880 | local->iw_mode == IW_MODE_REPEAT) && | |
881 | !from_assoc_ap) { | |
882 | switch (hostap_handle_sta_rx(local, dev, skb, rx_stats, | |
883 | wds != NULL)) { | |
884 | case AP_RX_CONTINUE_NOT_AUTHORIZED: | |
885 | frame_authorized = 0; | |
886 | break; | |
887 | case AP_RX_CONTINUE: | |
888 | frame_authorized = 1; | |
889 | break; | |
890 | case AP_RX_DROP: | |
891 | goto rx_dropped; | |
892 | case AP_RX_EXIT: | |
893 | goto rx_exit; | |
894 | } | |
895 | } | |
896 | ||
897 | /* Nullfunc frames may have PS-bit set, so they must be passed to | |
898 | * hostap_handle_sta_rx() before being dropped here. */ | |
4339d328 JM |
899 | if (stype != IEEE80211_STYPE_DATA && |
900 | stype != IEEE80211_STYPE_DATA_CFACK && | |
901 | stype != IEEE80211_STYPE_DATA_CFPOLL && | |
902 | stype != IEEE80211_STYPE_DATA_CFACKPOLL) { | |
903 | if (stype != IEEE80211_STYPE_NULLFUNC) | |
ff1d2767 JM |
904 | printk(KERN_DEBUG "%s: RX: dropped data frame " |
905 | "with no data (type=0x%02x, subtype=0x%02x)\n", | |
4339d328 | 906 | dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
907 | goto rx_dropped; |
908 | } | |
909 | ||
910 | /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ | |
911 | ||
831a179f | 912 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
913 | (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0) |
914 | goto rx_dropped; | |
1ea893fd | 915 | hdr = (struct ieee80211_hdr *) skb->data; |
ff1d2767 JM |
916 | |
917 | /* skb: hdr + (possibly fragmented) plaintext payload */ | |
918 | ||
831a179f | 919 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
b2f4a2e3 | 920 | (frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) { |
ff1d2767 JM |
921 | int flen; |
922 | struct sk_buff *frag_skb = | |
923 | prism2_frag_cache_get(local, hdr); | |
924 | if (!frag_skb) { | |
925 | printk(KERN_DEBUG "%s: Rx cannot get skb from " | |
926 | "fragment cache (morefrag=%d seq=%u frag=%u)\n", | |
b2f4a2e3 | 927 | dev->name, (fc & IEEE80211_FCTL_MOREFRAGS) != 0, |
1ea893fd | 928 | (sc & IEEE80211_SCTL_SEQ) >> 4, frag); |
ff1d2767 JM |
929 | goto rx_dropped; |
930 | } | |
931 | ||
932 | flen = skb->len; | |
933 | if (frag != 0) | |
934 | flen -= hdrlen; | |
935 | ||
4305b541 | 936 | if (frag_skb->tail + flen > frag_skb->end) { |
ff1d2767 JM |
937 | printk(KERN_WARNING "%s: host decrypted and " |
938 | "reassembled frame did not fit skb\n", | |
939 | dev->name); | |
940 | prism2_frag_cache_invalidate(local, hdr); | |
941 | goto rx_dropped; | |
942 | } | |
943 | ||
944 | if (frag == 0) { | |
945 | /* copy first fragment (including full headers) into | |
946 | * beginning of the fragment cache skb */ | |
d626f62b ACM |
947 | skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), |
948 | flen); | |
ff1d2767 JM |
949 | } else { |
950 | /* append frame payload to the end of the fragment | |
951 | * cache skb */ | |
d626f62b ACM |
952 | skb_copy_from_linear_data_offset(skb, hdrlen, |
953 | skb_put(frag_skb, | |
954 | flen), flen); | |
ff1d2767 JM |
955 | } |
956 | dev_kfree_skb(skb); | |
957 | skb = NULL; | |
958 | ||
b2f4a2e3 | 959 | if (fc & IEEE80211_FCTL_MOREFRAGS) { |
ff1d2767 JM |
960 | /* more fragments expected - leave the skb in fragment |
961 | * cache for now; it will be delivered to upper layers | |
962 | * after all fragments have been received */ | |
963 | goto rx_exit; | |
964 | } | |
965 | ||
966 | /* this was the last fragment and the frame will be | |
967 | * delivered, so remove skb from fragment cache */ | |
968 | skb = frag_skb; | |
1ea893fd | 969 | hdr = (struct ieee80211_hdr *) skb->data; |
ff1d2767 JM |
970 | prism2_frag_cache_invalidate(local, hdr); |
971 | } | |
972 | ||
973 | /* skb: hdr + (possible reassembled) full MSDU payload; possibly still | |
974 | * encrypted/authenticated */ | |
975 | ||
831a179f | 976 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
977 | hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt)) |
978 | goto rx_dropped; | |
979 | ||
1ea893fd | 980 | hdr = (struct ieee80211_hdr *) skb->data; |
831a179f | 981 | if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !local->open_wep) { |
ff1d2767 JM |
982 | if (local->ieee_802_1x && |
983 | hostap_is_eapol_frame(local, skb)) { | |
984 | /* pass unencrypted EAPOL frames even if encryption is | |
985 | * configured */ | |
986 | PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing " | |
987 | "unencrypted EAPOL frame\n", local->dev->name); | |
988 | } else { | |
989 | printk(KERN_DEBUG "%s: encryption configured, but RX " | |
e174961c JB |
990 | "frame not encrypted (SA=%pM)\n", |
991 | local->dev->name, hdr->addr2); | |
ff1d2767 JM |
992 | goto rx_dropped; |
993 | } | |
994 | } | |
995 | ||
831a179f | 996 | if (local->drop_unencrypted && !(fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
997 | !hostap_is_eapol_frame(local, skb)) { |
998 | if (net_ratelimit()) { | |
999 | printk(KERN_DEBUG "%s: dropped unencrypted RX data " | |
e174961c JB |
1000 | "frame from %pM (drop_unencrypted=1)\n", |
1001 | dev->name, hdr->addr2); | |
ff1d2767 JM |
1002 | } |
1003 | goto rx_dropped; | |
1004 | } | |
1005 | ||
1006 | /* skb: hdr + (possible reassembled) full plaintext payload */ | |
1007 | ||
1008 | payload = skb->data + hdrlen; | |
1009 | ethertype = (payload[6] << 8) | payload[7]; | |
1010 | ||
1011 | /* If IEEE 802.1X is used, check whether the port is authorized to send | |
1012 | * the received frame. */ | |
1013 | if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) { | |
1014 | if (ethertype == ETH_P_PAE) { | |
1015 | PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n", | |
1016 | dev->name); | |
1017 | if (local->hostapd && local->apdev) { | |
1018 | /* Send IEEE 802.1X frames to the user | |
1019 | * space daemon for processing */ | |
1020 | prism2_rx_80211(local->apdev, skb, rx_stats, | |
1021 | PRISM2_RX_MGMT); | |
1022 | local->apdevstats.rx_packets++; | |
1023 | local->apdevstats.rx_bytes += skb->len; | |
1024 | goto rx_exit; | |
1025 | } | |
1026 | } else if (!frame_authorized) { | |
1027 | printk(KERN_DEBUG "%s: dropped frame from " | |
1028 | "unauthorized port (IEEE 802.1X): " | |
1029 | "ethertype=0x%04x\n", | |
1030 | dev->name, ethertype); | |
1031 | goto rx_dropped; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | /* convert hdr + possible LLC headers into Ethernet header */ | |
1036 | if (skb->len - hdrlen >= 8 && | |
1037 | ((memcmp(payload, rfc1042_header, 6) == 0 && | |
1038 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1039 | memcmp(payload, bridge_tunnel_header, 6) == 0)) { | |
1040 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1041 | * replace EtherType */ | |
1042 | skb_pull(skb, hdrlen + 6); | |
1043 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1044 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1045 | } else { | |
8a9faf3c | 1046 | __be16 len; |
ff1d2767 JM |
1047 | /* Leave Ethernet header part of hdr and full payload */ |
1048 | skb_pull(skb, hdrlen); | |
1049 | len = htons(skb->len); | |
1050 | memcpy(skb_push(skb, 2), &len, 2); | |
1051 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1052 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1053 | } | |
1054 | ||
b2f4a2e3 JM |
1055 | if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
1056 | IEEE80211_FCTL_TODS) && | |
ff1d2767 JM |
1057 | skb->len >= ETH_HLEN + ETH_ALEN) { |
1058 | /* Non-standard frame: get addr4 from its bogus location after | |
1059 | * the payload */ | |
d626f62b ACM |
1060 | skb_copy_from_linear_data_offset(skb, skb->len - ETH_ALEN, |
1061 | skb->data + ETH_ALEN, | |
1062 | ETH_ALEN); | |
ff1d2767 JM |
1063 | skb_trim(skb, skb->len - ETH_ALEN); |
1064 | } | |
1065 | ||
4cfa8e45 SH |
1066 | dev->stats.rx_packets++; |
1067 | dev->stats.rx_bytes += skb->len; | |
ff1d2767 JM |
1068 | |
1069 | if (local->iw_mode == IW_MODE_MASTER && !wds && | |
1070 | local->ap->bridge_packets) { | |
1071 | if (dst[0] & 0x01) { | |
1072 | /* copy multicast frame both to the higher layers and | |
1073 | * to the wireless media */ | |
1074 | local->ap->bridged_multicast++; | |
1075 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1076 | if (skb2 == NULL) | |
1077 | printk(KERN_DEBUG "%s: skb_clone failed for " | |
1078 | "multicast frame\n", dev->name); | |
1079 | } else if (hostap_is_sta_authorized(local->ap, dst)) { | |
1080 | /* send frame directly to the associated STA using | |
1081 | * wireless media and not passing to higher layers */ | |
1082 | local->ap->bridged_unicast++; | |
1083 | skb2 = skb; | |
1084 | skb = NULL; | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | if (skb2 != NULL) { | |
1089 | /* send to wireless media */ | |
459a98ed | 1090 | skb2->dev = dev; |
c1b4aa3f | 1091 | skb2->protocol = cpu_to_be16(ETH_P_802_3); |
459a98ed | 1092 | skb_reset_mac_header(skb2); |
c1d2bbe1 | 1093 | skb_reset_network_header(skb2); |
b0e380b1 | 1094 | /* skb2->network_header += ETH_HLEN; */ |
ff1d2767 JM |
1095 | dev_queue_xmit(skb2); |
1096 | } | |
1097 | ||
1098 | if (skb) { | |
1099 | skb->protocol = eth_type_trans(skb, dev); | |
1100 | memset(skb->cb, 0, sizeof(skb->cb)); | |
ff1d2767 JM |
1101 | netif_rx(skb); |
1102 | } | |
1103 | ||
1104 | rx_exit: | |
1105 | if (sta) | |
1106 | hostap_handle_sta_release(sta); | |
1107 | return; | |
1108 | ||
1109 | rx_dropped: | |
1110 | dev_kfree_skb(skb); | |
1111 | ||
4cfa8e45 | 1112 | dev->stats.rx_dropped++; |
ff1d2767 JM |
1113 | goto rx_exit; |
1114 | } | |
1115 | ||
1116 | ||
1117 | EXPORT_SYMBOL(hostap_80211_rx); |