Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ff1d2767 | 2 | #include <linux/etherdevice.h> |
5a0e3ad6 | 3 | #include <linux/slab.h> |
ee40fa06 | 4 | #include <linux/export.h> |
274bfb8d | 5 | #include <net/lib80211.h> |
1ea893fd | 6 | #include <linux/if_arp.h> |
ff1d2767 JM |
7 | |
8 | #include "hostap_80211.h" | |
9 | #include "hostap.h" | |
5fad5a2e AB |
10 | #include "hostap_ap.h" |
11 | ||
12 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
13 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
14 | static unsigned char rfc1042_header[] = | |
15 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
16 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
17 | static unsigned char bridge_tunnel_header[] = | |
18 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
19 | /* No encapsulation header if EtherType < 0x600 (=length) */ | |
ff1d2767 JM |
20 | |
21 | void hostap_dump_rx_80211(const char *name, struct sk_buff *skb, | |
22 | struct hostap_80211_rx_status *rx_stats) | |
23 | { | |
1ea893fd | 24 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
25 | u16 fc; |
26 | ||
1ea893fd | 27 | hdr = (struct ieee80211_hdr *) skb->data; |
ff1d2767 JM |
28 | |
29 | printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d " | |
30 | "jiffies=%ld\n", | |
31 | name, rx_stats->signal, rx_stats->noise, rx_stats->rate, | |
32 | skb->len, jiffies); | |
33 | ||
34 | if (skb->len < 2) | |
35 | return; | |
36 | ||
1ea893fd | 37 | fc = le16_to_cpu(hdr->frame_control); |
ff1d2767 | 38 | printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s", |
1ea893fd DW |
39 | fc, (fc & IEEE80211_FCTL_FTYPE) >> 2, |
40 | (fc & IEEE80211_FCTL_STYPE) >> 4, | |
b2f4a2e3 JM |
41 | fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "", |
42 | fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : ""); | |
ff1d2767 JM |
43 | |
44 | if (skb->len < IEEE80211_DATA_HDR3_LEN) { | |
45 | printk("\n"); | |
46 | return; | |
47 | } | |
48 | ||
49 | printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id), | |
1ea893fd | 50 | le16_to_cpu(hdr->seq_ctrl)); |
ff1d2767 | 51 | |
e174961c JB |
52 | printk(KERN_DEBUG " A1=%pM", hdr->addr1); |
53 | printk(" A2=%pM", hdr->addr2); | |
54 | printk(" A3=%pM", hdr->addr3); | |
ff1d2767 | 55 | if (skb->len >= 30) |
e174961c | 56 | printk(" A4=%pM", hdr->addr4); |
ff1d2767 JM |
57 | printk("\n"); |
58 | } | |
59 | ||
60 | ||
61 | /* Send RX frame to netif with 802.11 (and possible prism) header. | |
62 | * Called from hardware or software IRQ context. */ | |
63 | int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb, | |
64 | struct hostap_80211_rx_status *rx_stats, int type) | |
65 | { | |
66 | struct hostap_interface *iface; | |
67 | local_info_t *local; | |
68 | int hdrlen, phdrlen, head_need, tail_need; | |
69 | u16 fc; | |
70 | int prism_header, ret; | |
1ea893fd | 71 | struct ieee80211_hdr *fhdr; |
ff1d2767 JM |
72 | |
73 | iface = netdev_priv(dev); | |
74 | local = iface->local; | |
ff1d2767 JM |
75 | |
76 | if (dev->type == ARPHRD_IEEE80211_PRISM) { | |
77 | if (local->monitor_type == PRISM2_MONITOR_PRISM) { | |
78 | prism_header = 1; | |
79 | phdrlen = sizeof(struct linux_wlan_ng_prism_hdr); | |
80 | } else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */ | |
81 | prism_header = 2; | |
82 | phdrlen = sizeof(struct linux_wlan_ng_cap_hdr); | |
83 | } | |
573b933f PR |
84 | } else if (dev->type == ARPHRD_IEEE80211_RADIOTAP) { |
85 | prism_header = 3; | |
86 | phdrlen = sizeof(struct hostap_radiotap_rx); | |
ff1d2767 JM |
87 | } else { |
88 | prism_header = 0; | |
89 | phdrlen = 0; | |
90 | } | |
91 | ||
1ea893fd DW |
92 | fhdr = (struct ieee80211_hdr *) skb->data; |
93 | fc = le16_to_cpu(fhdr->frame_control); | |
ff1d2767 | 94 | |
b2f4a2e3 | 95 | if (type == PRISM2_RX_MGMT && (fc & IEEE80211_FCTL_VERS)) { |
ff1d2767 | 96 | printk(KERN_DEBUG "%s: dropped management frame with header " |
b2f4a2e3 | 97 | "version %d\n", dev->name, fc & IEEE80211_FCTL_VERS); |
ff1d2767 JM |
98 | dev_kfree_skb_any(skb); |
99 | return 0; | |
100 | } | |
101 | ||
1ea893fd | 102 | hdrlen = hostap_80211_get_hdrlen(fhdr->frame_control); |
ff1d2767 JM |
103 | |
104 | /* check if there is enough room for extra data; if not, expand skb | |
105 | * buffer to be large enough for the changes */ | |
106 | head_need = phdrlen; | |
107 | tail_need = 0; | |
108 | #ifdef PRISM2_ADD_BOGUS_CRC | |
109 | tail_need += 4; | |
110 | #endif /* PRISM2_ADD_BOGUS_CRC */ | |
111 | ||
112 | head_need -= skb_headroom(skb); | |
113 | tail_need -= skb_tailroom(skb); | |
114 | ||
115 | if (head_need > 0 || tail_need > 0) { | |
116 | if (pskb_expand_head(skb, head_need > 0 ? head_need : 0, | |
117 | tail_need > 0 ? tail_need : 0, | |
118 | GFP_ATOMIC)) { | |
119 | printk(KERN_DEBUG "%s: prism2_rx_80211 failed to " | |
120 | "reallocate skb buffer\n", dev->name); | |
121 | dev_kfree_skb_any(skb); | |
122 | return 0; | |
123 | } | |
124 | } | |
125 | ||
126 | /* We now have an skb with enough head and tail room, so just insert | |
127 | * the extra data */ | |
128 | ||
129 | #ifdef PRISM2_ADD_BOGUS_CRC | |
130 | memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */ | |
131 | #endif /* PRISM2_ADD_BOGUS_CRC */ | |
132 | ||
133 | if (prism_header == 1) { | |
134 | struct linux_wlan_ng_prism_hdr *hdr; | |
d58ff351 | 135 | hdr = skb_push(skb, phdrlen); |
ff1d2767 JM |
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; | |
d58ff351 | 156 | hdr = skb_push(skb, phdrlen); |
ff1d2767 JM |
157 | memset(hdr, 0, phdrlen); |
158 | hdr->version = htonl(LWNG_CAPHDR_VERSION); | |
159 | hdr->length = htonl(phdrlen); | |
160 | hdr->mactime = __cpu_to_be64(rx_stats->mac_time); | |
161 | hdr->hosttime = __cpu_to_be64(jiffies); | |
162 | hdr->phytype = htonl(4); /* dss_dot11_b */ | |
163 | hdr->channel = htonl(local->channel); | |
164 | hdr->datarate = htonl(rx_stats->rate); | |
165 | hdr->antenna = htonl(0); /* unknown */ | |
166 | hdr->priority = htonl(0); /* unknown */ | |
167 | hdr->ssi_type = htonl(3); /* raw */ | |
168 | hdr->ssi_signal = htonl(rx_stats->signal); | |
169 | hdr->ssi_noise = htonl(rx_stats->noise); | |
170 | hdr->preamble = htonl(0); /* unknown */ | |
171 | hdr->encoding = htonl(1); /* cck */ | |
573b933f PR |
172 | } else if (prism_header == 3) { |
173 | struct hostap_radiotap_rx *hdr; | |
d58ff351 | 174 | hdr = skb_push(skb, phdrlen); |
573b933f PR |
175 | memset(hdr, 0, phdrlen); |
176 | hdr->hdr.it_len = cpu_to_le16(phdrlen); | |
177 | hdr->hdr.it_present = | |
178 | cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) | | |
179 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
180 | (1 << IEEE80211_RADIOTAP_RATE) | | |
181 | (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) | | |
182 | (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE)); | |
183 | hdr->tsft = cpu_to_le64(rx_stats->mac_time); | |
184 | hdr->chan_freq = cpu_to_le16(freq_list[local->channel - 1]); | |
185 | hdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_CCK | | |
186 | IEEE80211_CHAN_2GHZ); | |
187 | hdr->rate = rx_stats->rate / 5; | |
188 | hdr->dbm_antsignal = rx_stats->signal; | |
189 | hdr->dbm_antnoise = rx_stats->noise; | |
ff1d2767 JM |
190 | } |
191 | ||
192 | ret = skb->len - phdrlen; | |
193 | skb->dev = dev; | |
459a98ed | 194 | skb_reset_mac_header(skb); |
ff1d2767 JM |
195 | skb_pull(skb, hdrlen); |
196 | if (prism_header) | |
197 | skb_pull(skb, phdrlen); | |
198 | skb->pkt_type = PACKET_OTHERHOST; | |
c1b4aa3f | 199 | skb->protocol = cpu_to_be16(ETH_P_802_2); |
ff1d2767 JM |
200 | memset(skb->cb, 0, sizeof(skb->cb)); |
201 | netif_rx(skb); | |
202 | ||
203 | return ret; | |
204 | } | |
205 | ||
206 | ||
207 | /* Called only as a tasklet (software IRQ) */ | |
208 | static void monitor_rx(struct net_device *dev, struct sk_buff *skb, | |
209 | struct hostap_80211_rx_status *rx_stats) | |
210 | { | |
ff1d2767 JM |
211 | int len; |
212 | ||
213 | len = prism2_rx_80211(dev, skb, rx_stats, PRISM2_RX_MONITOR); | |
4cfa8e45 SH |
214 | dev->stats.rx_packets++; |
215 | dev->stats.rx_bytes += len; | |
ff1d2767 JM |
216 | } |
217 | ||
218 | ||
219 | /* Called only as a tasklet (software IRQ) */ | |
220 | static struct prism2_frag_entry * | |
221 | prism2_frag_cache_find(local_info_t *local, unsigned int seq, | |
222 | unsigned int frag, u8 *src, u8 *dst) | |
223 | { | |
224 | struct prism2_frag_entry *entry; | |
225 | int i; | |
226 | ||
227 | for (i = 0; i < PRISM2_FRAG_CACHE_LEN; i++) { | |
228 | entry = &local->frag_cache[i]; | |
229 | if (entry->skb != NULL && | |
230 | time_after(jiffies, entry->first_frag_time + 2 * HZ)) { | |
231 | printk(KERN_DEBUG "%s: expiring fragment cache entry " | |
232 | "seq=%u last_frag=%u\n", | |
233 | local->dev->name, entry->seq, entry->last_frag); | |
234 | dev_kfree_skb(entry->skb); | |
235 | entry->skb = NULL; | |
236 | } | |
237 | ||
238 | if (entry->skb != NULL && entry->seq == seq && | |
239 | (entry->last_frag + 1 == frag || frag == -1) && | |
240 | memcmp(entry->src_addr, src, ETH_ALEN) == 0 && | |
241 | memcmp(entry->dst_addr, dst, ETH_ALEN) == 0) | |
242 | return entry; | |
243 | } | |
244 | ||
245 | return NULL; | |
246 | } | |
247 | ||
248 | ||
249 | /* Called only as a tasklet (software IRQ) */ | |
250 | static struct sk_buff * | |
1ea893fd | 251 | prism2_frag_cache_get(local_info_t *local, struct ieee80211_hdr *hdr) |
ff1d2767 JM |
252 | { |
253 | struct sk_buff *skb = NULL; | |
254 | u16 sc; | |
255 | unsigned int frag, seq; | |
256 | struct prism2_frag_entry *entry; | |
257 | ||
1ea893fd DW |
258 | sc = le16_to_cpu(hdr->seq_ctrl); |
259 | frag = sc & IEEE80211_SCTL_FRAG; | |
260 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
ff1d2767 JM |
261 | |
262 | if (frag == 0) { | |
263 | /* Reserve enough space to fit maximum frame length */ | |
264 | skb = dev_alloc_skb(local->dev->mtu + | |
1ea893fd | 265 | sizeof(struct ieee80211_hdr) + |
ff1d2767 JM |
266 | 8 /* LLC */ + |
267 | 2 /* alignment */ + | |
268 | 8 /* WEP */ + ETH_ALEN /* WDS */); | |
269 | if (skb == NULL) | |
270 | return NULL; | |
271 | ||
272 | entry = &local->frag_cache[local->frag_next_idx]; | |
273 | local->frag_next_idx++; | |
274 | if (local->frag_next_idx >= PRISM2_FRAG_CACHE_LEN) | |
275 | local->frag_next_idx = 0; | |
276 | ||
277 | if (entry->skb != NULL) | |
278 | dev_kfree_skb(entry->skb); | |
279 | ||
280 | entry->first_frag_time = jiffies; | |
281 | entry->seq = seq; | |
282 | entry->last_frag = frag; | |
283 | entry->skb = skb; | |
284 | memcpy(entry->src_addr, hdr->addr2, ETH_ALEN); | |
285 | memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN); | |
286 | } else { | |
287 | /* received a fragment of a frame for which the head fragment | |
288 | * should have already been received */ | |
289 | entry = prism2_frag_cache_find(local, seq, frag, hdr->addr2, | |
290 | hdr->addr1); | |
291 | if (entry != NULL) { | |
292 | entry->last_frag = frag; | |
293 | skb = entry->skb; | |
294 | } | |
295 | } | |
296 | ||
297 | return skb; | |
298 | } | |
299 | ||
300 | ||
301 | /* Called only as a tasklet (software IRQ) */ | |
302 | static int prism2_frag_cache_invalidate(local_info_t *local, | |
1ea893fd | 303 | struct ieee80211_hdr *hdr) |
ff1d2767 JM |
304 | { |
305 | u16 sc; | |
306 | unsigned int seq; | |
307 | struct prism2_frag_entry *entry; | |
308 | ||
1ea893fd DW |
309 | sc = le16_to_cpu(hdr->seq_ctrl); |
310 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
ff1d2767 JM |
311 | |
312 | entry = prism2_frag_cache_find(local, seq, -1, hdr->addr2, hdr->addr1); | |
313 | ||
314 | if (entry == NULL) { | |
315 | printk(KERN_DEBUG "%s: could not invalidate fragment cache " | |
316 | "entry (seq=%u)\n", | |
317 | local->dev->name, seq); | |
318 | return -1; | |
319 | } | |
320 | ||
321 | entry->skb = NULL; | |
322 | return 0; | |
323 | } | |
324 | ||
325 | ||
326 | static struct hostap_bss_info *__hostap_get_bss(local_info_t *local, u8 *bssid, | |
327 | u8 *ssid, size_t ssid_len) | |
328 | { | |
329 | struct list_head *ptr; | |
330 | struct hostap_bss_info *bss; | |
331 | ||
332 | list_for_each(ptr, &local->bss_list) { | |
333 | bss = list_entry(ptr, struct hostap_bss_info, list); | |
334 | if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && | |
335 | (ssid == NULL || | |
336 | (ssid_len == bss->ssid_len && | |
337 | memcmp(ssid, bss->ssid, ssid_len) == 0))) { | |
338 | list_move(&bss->list, &local->bss_list); | |
339 | return bss; | |
340 | } | |
341 | } | |
342 | ||
343 | return NULL; | |
344 | } | |
345 | ||
346 | ||
347 | static struct hostap_bss_info *__hostap_add_bss(local_info_t *local, u8 *bssid, | |
348 | u8 *ssid, size_t ssid_len) | |
349 | { | |
350 | struct hostap_bss_info *bss; | |
351 | ||
352 | if (local->num_bss_info >= HOSTAP_MAX_BSS_COUNT) { | |
353 | bss = list_entry(local->bss_list.prev, | |
354 | struct hostap_bss_info, list); | |
355 | list_del(&bss->list); | |
356 | local->num_bss_info--; | |
357 | } else { | |
aca8c6fa | 358 | bss = kmalloc(sizeof(*bss), GFP_ATOMIC); |
ff1d2767 JM |
359 | if (bss == NULL) |
360 | return NULL; | |
361 | } | |
362 | ||
363 | memset(bss, 0, sizeof(*bss)); | |
364 | memcpy(bss->bssid, bssid, ETH_ALEN); | |
365 | memcpy(bss->ssid, ssid, ssid_len); | |
366 | bss->ssid_len = ssid_len; | |
367 | local->num_bss_info++; | |
368 | list_add(&bss->list, &local->bss_list); | |
369 | return bss; | |
370 | } | |
371 | ||
372 | ||
373 | static void __hostap_expire_bss(local_info_t *local) | |
374 | { | |
375 | struct hostap_bss_info *bss; | |
376 | ||
377 | while (local->num_bss_info > 0) { | |
378 | bss = list_entry(local->bss_list.prev, | |
379 | struct hostap_bss_info, list); | |
380 | if (!time_after(jiffies, bss->last_update + 60 * HZ)) | |
381 | break; | |
382 | ||
383 | list_del(&bss->list); | |
384 | local->num_bss_info--; | |
385 | kfree(bss); | |
386 | } | |
387 | } | |
388 | ||
389 | ||
390 | /* Both IEEE 802.11 Beacon and Probe Response frames have similar structure, so | |
391 | * the same routine can be used to parse both of them. */ | |
392 | static void hostap_rx_sta_beacon(local_info_t *local, struct sk_buff *skb, | |
393 | int stype) | |
394 | { | |
395 | struct hostap_ieee80211_mgmt *mgmt; | |
396 | int left, chan = 0; | |
397 | u8 *pos; | |
398 | u8 *ssid = NULL, *wpa = NULL, *rsn = NULL; | |
399 | size_t ssid_len = 0, wpa_len = 0, rsn_len = 0; | |
400 | struct hostap_bss_info *bss; | |
401 | ||
402 | if (skb->len < IEEE80211_MGMT_HDR_LEN + sizeof(mgmt->u.beacon)) | |
403 | return; | |
404 | ||
405 | mgmt = (struct hostap_ieee80211_mgmt *) skb->data; | |
406 | pos = mgmt->u.beacon.variable; | |
407 | left = skb->len - (pos - skb->data); | |
408 | ||
409 | while (left >= 2) { | |
410 | if (2 + pos[1] > left) | |
411 | return; /* parse failed */ | |
412 | switch (*pos) { | |
413 | case WLAN_EID_SSID: | |
414 | ssid = pos + 2; | |
415 | ssid_len = pos[1]; | |
416 | break; | |
04b2312a | 417 | case WLAN_EID_VENDOR_SPECIFIC: |
ff1d2767 JM |
418 | if (pos[1] >= 4 && |
419 | pos[2] == 0x00 && pos[3] == 0x50 && | |
420 | pos[4] == 0xf2 && pos[5] == 1) { | |
421 | wpa = pos; | |
422 | wpa_len = pos[1] + 2; | |
423 | } | |
424 | break; | |
425 | case WLAN_EID_RSN: | |
426 | rsn = pos; | |
427 | rsn_len = pos[1] + 2; | |
428 | break; | |
429 | case WLAN_EID_DS_PARAMS: | |
430 | if (pos[1] >= 1) | |
431 | chan = pos[2]; | |
432 | break; | |
433 | } | |
434 | left -= 2 + pos[1]; | |
435 | pos += 2 + pos[1]; | |
436 | } | |
437 | ||
438 | if (wpa_len > MAX_WPA_IE_LEN) | |
439 | wpa_len = MAX_WPA_IE_LEN; | |
440 | if (rsn_len > MAX_WPA_IE_LEN) | |
441 | rsn_len = MAX_WPA_IE_LEN; | |
442 | if (ssid_len > sizeof(bss->ssid)) | |
443 | ssid_len = sizeof(bss->ssid); | |
444 | ||
445 | spin_lock(&local->lock); | |
446 | bss = __hostap_get_bss(local, mgmt->bssid, ssid, ssid_len); | |
447 | if (bss == NULL) | |
448 | bss = __hostap_add_bss(local, mgmt->bssid, ssid, ssid_len); | |
449 | if (bss) { | |
450 | bss->last_update = jiffies; | |
451 | bss->count++; | |
452 | bss->capab_info = le16_to_cpu(mgmt->u.beacon.capab_info); | |
453 | if (wpa) { | |
454 | memcpy(bss->wpa_ie, wpa, wpa_len); | |
455 | bss->wpa_ie_len = wpa_len; | |
456 | } else | |
457 | bss->wpa_ie_len = 0; | |
458 | if (rsn) { | |
459 | memcpy(bss->rsn_ie, rsn, rsn_len); | |
460 | bss->rsn_ie_len = rsn_len; | |
461 | } else | |
462 | bss->rsn_ie_len = 0; | |
463 | bss->chan = chan; | |
464 | } | |
465 | __hostap_expire_bss(local); | |
466 | spin_unlock(&local->lock); | |
467 | } | |
468 | ||
469 | ||
858119e1 | 470 | static int |
ff1d2767 JM |
471 | hostap_rx_frame_mgmt(local_info_t *local, struct sk_buff *skb, |
472 | struct hostap_80211_rx_status *rx_stats, u16 type, | |
473 | u16 stype) | |
474 | { | |
1ea893fd DW |
475 | if (local->iw_mode == IW_MODE_MASTER) |
476 | hostap_update_sta_ps(local, (struct ieee80211_hdr *) skb->data); | |
ff1d2767 | 477 | |
4339d328 JM |
478 | if (local->hostapd && type == IEEE80211_FTYPE_MGMT) { |
479 | if (stype == IEEE80211_STYPE_BEACON && | |
ff1d2767 JM |
480 | local->iw_mode == IW_MODE_MASTER) { |
481 | struct sk_buff *skb2; | |
482 | /* Process beacon frames also in kernel driver to | |
483 | * update STA(AP) table statistics */ | |
484 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
485 | if (skb2) | |
486 | hostap_rx(skb2->dev, skb2, rx_stats); | |
487 | } | |
488 | ||
489 | /* send management frames to the user space daemon for | |
490 | * processing */ | |
491 | local->apdevstats.rx_packets++; | |
492 | local->apdevstats.rx_bytes += skb->len; | |
493 | if (local->apdev == NULL) | |
494 | return -1; | |
495 | prism2_rx_80211(local->apdev, skb, rx_stats, PRISM2_RX_MGMT); | |
496 | return 0; | |
497 | } | |
498 | ||
499 | if (local->iw_mode == IW_MODE_MASTER) { | |
4339d328 JM |
500 | if (type != IEEE80211_FTYPE_MGMT && |
501 | type != IEEE80211_FTYPE_CTL) { | |
ff1d2767 JM |
502 | printk(KERN_DEBUG "%s: unknown management frame " |
503 | "(type=0x%02x, stype=0x%02x) dropped\n", | |
4339d328 | 504 | skb->dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
505 | return -1; |
506 | } | |
507 | ||
508 | hostap_rx(skb->dev, skb, rx_stats); | |
509 | return 0; | |
4339d328 JM |
510 | } else if (type == IEEE80211_FTYPE_MGMT && |
511 | (stype == IEEE80211_STYPE_BEACON || | |
512 | stype == IEEE80211_STYPE_PROBE_RESP)) { | |
ff1d2767 JM |
513 | hostap_rx_sta_beacon(local, skb, stype); |
514 | return -1; | |
4339d328 JM |
515 | } else if (type == IEEE80211_FTYPE_MGMT && |
516 | (stype == IEEE80211_STYPE_ASSOC_RESP || | |
517 | stype == IEEE80211_STYPE_REASSOC_RESP)) { | |
ff1d2767 JM |
518 | /* Ignore (Re)AssocResp silently since these are not currently |
519 | * needed but are still received when WPA/RSN mode is enabled. | |
520 | */ | |
521 | return -1; | |
522 | } else { | |
523 | printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: dropped unhandled" | |
524 | " management frame in non-Host AP mode (type=%d:%d)\n", | |
4339d328 | 525 | skb->dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
526 | return -1; |
527 | } | |
528 | } | |
529 | ||
530 | ||
531 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 532 | static struct net_device *prism2_rx_get_wds(local_info_t *local, |
ff1d2767 JM |
533 | u8 *addr) |
534 | { | |
535 | struct hostap_interface *iface = NULL; | |
536 | struct list_head *ptr; | |
537 | ||
538 | read_lock_bh(&local->iface_lock); | |
539 | list_for_each(ptr, &local->hostap_interfaces) { | |
540 | iface = list_entry(ptr, struct hostap_interface, list); | |
541 | if (iface->type == HOSTAP_INTERFACE_WDS && | |
542 | memcmp(iface->u.wds.remote_addr, addr, ETH_ALEN) == 0) | |
543 | break; | |
544 | iface = NULL; | |
545 | } | |
546 | read_unlock_bh(&local->iface_lock); | |
547 | ||
548 | return iface ? iface->dev : NULL; | |
549 | } | |
550 | ||
551 | ||
858119e1 | 552 | static int |
1ea893fd DW |
553 | hostap_rx_frame_wds(local_info_t *local, struct ieee80211_hdr *hdr, u16 fc, |
554 | struct net_device **wds) | |
ff1d2767 JM |
555 | { |
556 | /* FIX: is this really supposed to accept WDS frames only in Master | |
557 | * mode? What about Repeater or Managed with WDS frames? */ | |
b2f4a2e3 JM |
558 | if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) != |
559 | (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS) && | |
560 | (local->iw_mode != IW_MODE_MASTER || !(fc & IEEE80211_FCTL_TODS))) | |
ff1d2767 JM |
561 | return 0; /* not a WDS frame */ |
562 | ||
563 | /* Possible WDS frame: either IEEE 802.11 compliant (if FromDS) | |
564 | * or own non-standard frame with 4th address after payload */ | |
692e5167 | 565 | if (!ether_addr_equal(hdr->addr1, local->dev->dev_addr) && |
ff1d2767 JM |
566 | (hdr->addr1[0] != 0xff || hdr->addr1[1] != 0xff || |
567 | hdr->addr1[2] != 0xff || hdr->addr1[3] != 0xff || | |
568 | hdr->addr1[4] != 0xff || hdr->addr1[5] != 0xff)) { | |
569 | /* RA (or BSSID) is not ours - drop */ | |
15ea0ebc | 570 | PDEBUG(DEBUG_EXTRA2, "%s: received WDS frame with " |
e174961c | 571 | "not own or broadcast %s=%pM\n", |
b2f4a2e3 JM |
572 | local->dev->name, |
573 | fc & IEEE80211_FCTL_FROMDS ? "RA" : "BSSID", | |
e174961c | 574 | hdr->addr1); |
ff1d2767 JM |
575 | return -1; |
576 | } | |
577 | ||
578 | /* check if the frame came from a registered WDS connection */ | |
579 | *wds = prism2_rx_get_wds(local, hdr->addr2); | |
b2f4a2e3 | 580 | if (*wds == NULL && fc & IEEE80211_FCTL_FROMDS && |
ff1d2767 JM |
581 | (local->iw_mode != IW_MODE_INFRA || |
582 | !(local->wds_type & HOSTAP_WDS_AP_CLIENT) || | |
583 | memcmp(hdr->addr2, local->bssid, ETH_ALEN) != 0)) { | |
584 | /* require that WDS link has been registered with TA or the | |
585 | * frame is from current AP when using 'AP client mode' */ | |
586 | PDEBUG(DEBUG_EXTRA, "%s: received WDS[4 addr] frame " | |
e174961c JB |
587 | "from unknown TA=%pM\n", |
588 | local->dev->name, hdr->addr2); | |
ff1d2767 JM |
589 | if (local->ap && local->ap->autom_ap_wds) |
590 | hostap_wds_link_oper(local, hdr->addr2, WDS_ADD); | |
591 | return -1; | |
592 | } | |
593 | ||
b2f4a2e3 | 594 | if (*wds && !(fc & IEEE80211_FCTL_FROMDS) && local->ap && |
ff1d2767 JM |
595 | hostap_is_sta_assoc(local->ap, hdr->addr2)) { |
596 | /* STA is actually associated with us even though it has a | |
597 | * registered WDS link. Assume it is in 'AP client' mode. | |
598 | * Since this is a 3-addr frame, assume it is not (bogus) WDS | |
599 | * frame and process it like any normal ToDS frame from | |
600 | * associated STA. */ | |
601 | *wds = NULL; | |
602 | } | |
603 | ||
604 | return 0; | |
605 | } | |
606 | ||
607 | ||
608 | static int hostap_is_eapol_frame(local_info_t *local, struct sk_buff *skb) | |
609 | { | |
610 | struct net_device *dev = local->dev; | |
611 | u16 fc, ethertype; | |
1ea893fd | 612 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
613 | u8 *pos; |
614 | ||
615 | if (skb->len < 24) | |
616 | return 0; | |
617 | ||
1ea893fd DW |
618 | hdr = (struct ieee80211_hdr *) skb->data; |
619 | fc = le16_to_cpu(hdr->frame_control); | |
ff1d2767 JM |
620 | |
621 | /* check that the frame is unicast frame to us */ | |
b2f4a2e3 JM |
622 | if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
623 | IEEE80211_FCTL_TODS && | |
692e5167 | 624 | ether_addr_equal(hdr->addr1, dev->dev_addr) && |
625 | ether_addr_equal(hdr->addr3, dev->dev_addr)) { | |
ff1d2767 | 626 | /* ToDS frame with own addr BSSID and DA */ |
b2f4a2e3 JM |
627 | } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
628 | IEEE80211_FCTL_FROMDS && | |
692e5167 | 629 | ether_addr_equal(hdr->addr1, dev->dev_addr)) { |
ff1d2767 JM |
630 | /* FromDS frame with own addr as DA */ |
631 | } else | |
632 | return 0; | |
633 | ||
634 | if (skb->len < 24 + 8) | |
635 | return 0; | |
636 | ||
637 | /* check for port access entity Ethernet type */ | |
638 | pos = skb->data + 24; | |
639 | ethertype = (pos[6] << 8) | pos[7]; | |
640 | if (ethertype == ETH_P_PAE) | |
641 | return 1; | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | ||
647 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 648 | static int |
ff1d2767 | 649 | hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb, |
274bfb8d | 650 | struct lib80211_crypt_data *crypt) |
ff1d2767 | 651 | { |
1ea893fd | 652 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
653 | int res, hdrlen; |
654 | ||
655 | if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) | |
656 | return 0; | |
657 | ||
1ea893fd DW |
658 | hdr = (struct ieee80211_hdr *) skb->data; |
659 | hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); | |
ff1d2767 JM |
660 | |
661 | if (local->tkip_countermeasures && | |
662 | strcmp(crypt->ops->name, "TKIP") == 0) { | |
663 | if (net_ratelimit()) { | |
664 | printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " | |
e174961c JB |
665 | "received packet from %pM\n", |
666 | local->dev->name, hdr->addr2); | |
ff1d2767 JM |
667 | } |
668 | return -1; | |
669 | } | |
670 | ||
671 | atomic_inc(&crypt->refcnt); | |
672 | res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); | |
673 | atomic_dec(&crypt->refcnt); | |
674 | if (res < 0) { | |
e174961c JB |
675 | printk(KERN_DEBUG "%s: decryption failed (SA=%pM) res=%d\n", |
676 | local->dev->name, hdr->addr2, res); | |
ff1d2767 JM |
677 | local->comm_tallies.rx_discards_wep_undecryptable++; |
678 | return -1; | |
679 | } | |
680 | ||
681 | return res; | |
682 | } | |
683 | ||
684 | ||
685 | /* Called only as a tasklet (software IRQ) */ | |
858119e1 | 686 | static int |
ff1d2767 | 687 | hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb, |
274bfb8d | 688 | int keyidx, struct lib80211_crypt_data *crypt) |
ff1d2767 | 689 | { |
1ea893fd | 690 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
691 | int res, hdrlen; |
692 | ||
693 | if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) | |
694 | return 0; | |
695 | ||
1ea893fd DW |
696 | hdr = (struct ieee80211_hdr *) skb->data; |
697 | hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); | |
ff1d2767 JM |
698 | |
699 | atomic_inc(&crypt->refcnt); | |
700 | res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); | |
701 | atomic_dec(&crypt->refcnt); | |
702 | if (res < 0) { | |
703 | printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" | |
e174961c JB |
704 | " (SA=%pM keyidx=%d)\n", |
705 | local->dev->name, hdr->addr2, keyidx); | |
ff1d2767 JM |
706 | return -1; |
707 | } | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | ||
713 | /* All received frames are sent to this function. @skb contains the frame in | |
714 | * IEEE 802.11 format, i.e., in the format it was sent over air. | |
715 | * This function is called only as a tasklet (software IRQ). */ | |
716 | void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb, | |
717 | struct hostap_80211_rx_status *rx_stats) | |
718 | { | |
719 | struct hostap_interface *iface; | |
720 | local_info_t *local; | |
1ea893fd | 721 | struct ieee80211_hdr *hdr; |
ff1d2767 JM |
722 | size_t hdrlen; |
723 | u16 fc, type, stype, sc; | |
724 | struct net_device *wds = NULL; | |
ff1d2767 JM |
725 | unsigned int frag; |
726 | u8 *payload; | |
727 | struct sk_buff *skb2 = NULL; | |
728 | u16 ethertype; | |
729 | int frame_authorized = 0; | |
730 | int from_assoc_ap = 0; | |
731 | u8 dst[ETH_ALEN]; | |
732 | u8 src[ETH_ALEN]; | |
274bfb8d | 733 | struct lib80211_crypt_data *crypt = NULL; |
ff1d2767 JM |
734 | void *sta = NULL; |
735 | int keyidx = 0; | |
736 | ||
737 | iface = netdev_priv(dev); | |
738 | local = iface->local; | |
739 | iface->stats.rx_packets++; | |
740 | iface->stats.rx_bytes += skb->len; | |
741 | ||
742 | /* dev is the master radio device; change this to be the default | |
743 | * virtual interface (this may be changed to WDS device below) */ | |
744 | dev = local->ddev; | |
745 | iface = netdev_priv(dev); | |
746 | ||
1ea893fd | 747 | hdr = (struct ieee80211_hdr *) skb->data; |
ff1d2767 JM |
748 | |
749 | if (skb->len < 10) | |
750 | goto rx_dropped; | |
751 | ||
1ea893fd DW |
752 | fc = le16_to_cpu(hdr->frame_control); |
753 | type = fc & IEEE80211_FCTL_FTYPE; | |
754 | stype = fc & IEEE80211_FCTL_STYPE; | |
755 | sc = le16_to_cpu(hdr->seq_ctrl); | |
756 | frag = sc & IEEE80211_SCTL_FRAG; | |
757 | hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); | |
ff1d2767 JM |
758 | |
759 | /* Put this code here so that we avoid duplicating it in all | |
760 | * Rx paths. - Jean II */ | |
761 | #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ | |
762 | /* If spy monitoring on */ | |
763 | if (iface->spy_data.spy_number > 0) { | |
764 | struct iw_quality wstats; | |
765 | wstats.level = rx_stats->signal; | |
766 | wstats.noise = rx_stats->noise; | |
c28df16e JT |
767 | wstats.updated = IW_QUAL_LEVEL_UPDATED | IW_QUAL_NOISE_UPDATED |
768 | | IW_QUAL_QUAL_INVALID | IW_QUAL_DBM; | |
ff1d2767 JM |
769 | /* Update spy records */ |
770 | wireless_spy_update(dev, hdr->addr2, &wstats); | |
771 | } | |
772 | #endif /* IW_WIRELESS_SPY */ | |
773 | hostap_update_rx_stats(local->ap, hdr, rx_stats); | |
774 | ||
775 | if (local->iw_mode == IW_MODE_MONITOR) { | |
776 | monitor_rx(dev, skb, rx_stats); | |
777 | return; | |
778 | } | |
779 | ||
780 | if (local->host_decrypt) { | |
781 | int idx = 0; | |
782 | if (skb->len >= hdrlen + 3) | |
783 | idx = skb->data[hdrlen + 3] >> 6; | |
274bfb8d | 784 | crypt = local->crypt_info.crypt[idx]; |
ff1d2767 JM |
785 | sta = NULL; |
786 | ||
787 | /* Use station specific key to override default keys if the | |
788 | * receiver address is a unicast address ("individual RA"). If | |
789 | * bcrx_sta_key parameter is set, station specific key is used | |
790 | * even with broad/multicast targets (this is against IEEE | |
791 | * 802.11, but makes it easier to use different keys with | |
792 | * stations that do not support WEP key mapping). */ | |
793 | ||
794 | if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key) | |
795 | (void) hostap_handle_sta_crypto(local, hdr, &crypt, | |
796 | &sta); | |
797 | ||
798 | /* allow NULL decrypt to indicate an station specific override | |
799 | * for default encryption */ | |
800 | if (crypt && (crypt->ops == NULL || | |
801 | crypt->ops->decrypt_mpdu == NULL)) | |
802 | crypt = NULL; | |
803 | ||
831a179f | 804 | if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) { |
ff1d2767 JM |
805 | #if 0 |
806 | /* This seems to be triggered by some (multicast?) | |
807 | * frames from other than current BSS, so just drop the | |
808 | * frames silently instead of filling system log with | |
809 | * these reports. */ | |
810 | printk(KERN_DEBUG "%s: WEP decryption failed (not set)" | |
e174961c JB |
811 | " (SA=%pM)\n", |
812 | local->dev->name, hdr->addr2); | |
ff1d2767 JM |
813 | #endif |
814 | local->comm_tallies.rx_discards_wep_undecryptable++; | |
815 | goto rx_dropped; | |
816 | } | |
817 | } | |
818 | ||
4339d328 JM |
819 | if (type != IEEE80211_FTYPE_DATA) { |
820 | if (type == IEEE80211_FTYPE_MGMT && | |
821 | stype == IEEE80211_STYPE_AUTH && | |
831a179f | 822 | fc & IEEE80211_FCTL_PROTECTED && local->host_decrypt && |
ff1d2767 JM |
823 | (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0) |
824 | { | |
825 | printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " | |
e174961c | 826 | "from %pM\n", dev->name, hdr->addr2); |
ff1d2767 JM |
827 | /* TODO: could inform hostapd about this so that it |
828 | * could send auth failure report */ | |
829 | goto rx_dropped; | |
830 | } | |
831 | ||
832 | if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype)) | |
833 | goto rx_dropped; | |
834 | else | |
835 | goto rx_exit; | |
836 | } | |
837 | ||
838 | /* Data frame - extract src/dst addresses */ | |
839 | if (skb->len < IEEE80211_DATA_HDR3_LEN) | |
840 | goto rx_dropped; | |
841 | ||
b2f4a2e3 JM |
842 | switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { |
843 | case IEEE80211_FCTL_FROMDS: | |
ff1d2767 JM |
844 | memcpy(dst, hdr->addr1, ETH_ALEN); |
845 | memcpy(src, hdr->addr3, ETH_ALEN); | |
846 | break; | |
b2f4a2e3 | 847 | case IEEE80211_FCTL_TODS: |
ff1d2767 JM |
848 | memcpy(dst, hdr->addr3, ETH_ALEN); |
849 | memcpy(src, hdr->addr2, ETH_ALEN); | |
850 | break; | |
b2f4a2e3 | 851 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: |
ff1d2767 JM |
852 | if (skb->len < IEEE80211_DATA_HDR4_LEN) |
853 | goto rx_dropped; | |
854 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
855 | memcpy(src, hdr->addr4, ETH_ALEN); | |
856 | break; | |
10f3366b | 857 | default: |
ff1d2767 JM |
858 | memcpy(dst, hdr->addr1, ETH_ALEN); |
859 | memcpy(src, hdr->addr2, ETH_ALEN); | |
860 | break; | |
861 | } | |
862 | ||
863 | if (hostap_rx_frame_wds(local, hdr, fc, &wds)) | |
864 | goto rx_dropped; | |
4cfa8e45 | 865 | if (wds) |
ff1d2767 | 866 | skb->dev = dev = wds; |
ff1d2767 JM |
867 | |
868 | if (local->iw_mode == IW_MODE_MASTER && !wds && | |
b2f4a2e3 JM |
869 | (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
870 | IEEE80211_FCTL_FROMDS && | |
ff1d2767 JM |
871 | local->stadev && |
872 | memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) { | |
873 | /* Frame from BSSID of the AP for which we are a client */ | |
874 | skb->dev = dev = local->stadev; | |
ff1d2767 JM |
875 | from_assoc_ap = 1; |
876 | } | |
877 | ||
ff1d2767 JM |
878 | if ((local->iw_mode == IW_MODE_MASTER || |
879 | local->iw_mode == IW_MODE_REPEAT) && | |
880 | !from_assoc_ap) { | |
881 | switch (hostap_handle_sta_rx(local, dev, skb, rx_stats, | |
882 | wds != NULL)) { | |
883 | case AP_RX_CONTINUE_NOT_AUTHORIZED: | |
884 | frame_authorized = 0; | |
885 | break; | |
886 | case AP_RX_CONTINUE: | |
887 | frame_authorized = 1; | |
888 | break; | |
889 | case AP_RX_DROP: | |
890 | goto rx_dropped; | |
891 | case AP_RX_EXIT: | |
892 | goto rx_exit; | |
893 | } | |
894 | } | |
895 | ||
896 | /* Nullfunc frames may have PS-bit set, so they must be passed to | |
897 | * hostap_handle_sta_rx() before being dropped here. */ | |
4339d328 JM |
898 | if (stype != IEEE80211_STYPE_DATA && |
899 | stype != IEEE80211_STYPE_DATA_CFACK && | |
900 | stype != IEEE80211_STYPE_DATA_CFPOLL && | |
901 | stype != IEEE80211_STYPE_DATA_CFACKPOLL) { | |
902 | if (stype != IEEE80211_STYPE_NULLFUNC) | |
ff1d2767 JM |
903 | printk(KERN_DEBUG "%s: RX: dropped data frame " |
904 | "with no data (type=0x%02x, subtype=0x%02x)\n", | |
4339d328 | 905 | dev->name, type >> 2, stype >> 4); |
ff1d2767 JM |
906 | goto rx_dropped; |
907 | } | |
908 | ||
909 | /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ | |
910 | ||
831a179f | 911 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
912 | (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0) |
913 | goto rx_dropped; | |
1ea893fd | 914 | hdr = (struct ieee80211_hdr *) skb->data; |
ff1d2767 JM |
915 | |
916 | /* skb: hdr + (possibly fragmented) plaintext payload */ | |
917 | ||
831a179f | 918 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
b2f4a2e3 | 919 | (frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) { |
ff1d2767 JM |
920 | int flen; |
921 | struct sk_buff *frag_skb = | |
922 | prism2_frag_cache_get(local, hdr); | |
923 | if (!frag_skb) { | |
924 | printk(KERN_DEBUG "%s: Rx cannot get skb from " | |
925 | "fragment cache (morefrag=%d seq=%u frag=%u)\n", | |
b2f4a2e3 | 926 | dev->name, (fc & IEEE80211_FCTL_MOREFRAGS) != 0, |
1ea893fd | 927 | (sc & IEEE80211_SCTL_SEQ) >> 4, frag); |
ff1d2767 JM |
928 | goto rx_dropped; |
929 | } | |
930 | ||
931 | flen = skb->len; | |
932 | if (frag != 0) | |
933 | flen -= hdrlen; | |
934 | ||
4305b541 | 935 | if (frag_skb->tail + flen > frag_skb->end) { |
ff1d2767 JM |
936 | printk(KERN_WARNING "%s: host decrypted and " |
937 | "reassembled frame did not fit skb\n", | |
938 | dev->name); | |
939 | prism2_frag_cache_invalidate(local, hdr); | |
940 | goto rx_dropped; | |
941 | } | |
942 | ||
943 | if (frag == 0) { | |
944 | /* copy first fragment (including full headers) into | |
945 | * beginning of the fragment cache skb */ | |
d626f62b ACM |
946 | skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), |
947 | flen); | |
ff1d2767 JM |
948 | } else { |
949 | /* append frame payload to the end of the fragment | |
950 | * cache skb */ | |
d626f62b ACM |
951 | skb_copy_from_linear_data_offset(skb, hdrlen, |
952 | skb_put(frag_skb, | |
953 | flen), flen); | |
ff1d2767 JM |
954 | } |
955 | dev_kfree_skb(skb); | |
956 | skb = NULL; | |
957 | ||
b2f4a2e3 | 958 | if (fc & IEEE80211_FCTL_MOREFRAGS) { |
ff1d2767 JM |
959 | /* more fragments expected - leave the skb in fragment |
960 | * cache for now; it will be delivered to upper layers | |
961 | * after all fragments have been received */ | |
962 | goto rx_exit; | |
963 | } | |
964 | ||
965 | /* this was the last fragment and the frame will be | |
966 | * delivered, so remove skb from fragment cache */ | |
967 | skb = frag_skb; | |
1ea893fd | 968 | hdr = (struct ieee80211_hdr *) skb->data; |
ff1d2767 JM |
969 | prism2_frag_cache_invalidate(local, hdr); |
970 | } | |
971 | ||
972 | /* skb: hdr + (possible reassembled) full MSDU payload; possibly still | |
973 | * encrypted/authenticated */ | |
974 | ||
831a179f | 975 | if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
976 | hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt)) |
977 | goto rx_dropped; | |
978 | ||
1ea893fd | 979 | hdr = (struct ieee80211_hdr *) skb->data; |
831a179f | 980 | if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !local->open_wep) { |
ff1d2767 JM |
981 | if (local->ieee_802_1x && |
982 | hostap_is_eapol_frame(local, skb)) { | |
983 | /* pass unencrypted EAPOL frames even if encryption is | |
984 | * configured */ | |
985 | PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing " | |
986 | "unencrypted EAPOL frame\n", local->dev->name); | |
987 | } else { | |
988 | printk(KERN_DEBUG "%s: encryption configured, but RX " | |
e174961c JB |
989 | "frame not encrypted (SA=%pM)\n", |
990 | local->dev->name, hdr->addr2); | |
ff1d2767 JM |
991 | goto rx_dropped; |
992 | } | |
993 | } | |
994 | ||
831a179f | 995 | if (local->drop_unencrypted && !(fc & IEEE80211_FCTL_PROTECTED) && |
ff1d2767 JM |
996 | !hostap_is_eapol_frame(local, skb)) { |
997 | if (net_ratelimit()) { | |
998 | printk(KERN_DEBUG "%s: dropped unencrypted RX data " | |
e174961c JB |
999 | "frame from %pM (drop_unencrypted=1)\n", |
1000 | dev->name, hdr->addr2); | |
ff1d2767 JM |
1001 | } |
1002 | goto rx_dropped; | |
1003 | } | |
1004 | ||
1005 | /* skb: hdr + (possible reassembled) full plaintext payload */ | |
1006 | ||
1007 | payload = skb->data + hdrlen; | |
1008 | ethertype = (payload[6] << 8) | payload[7]; | |
1009 | ||
1010 | /* If IEEE 802.1X is used, check whether the port is authorized to send | |
1011 | * the received frame. */ | |
1012 | if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) { | |
1013 | if (ethertype == ETH_P_PAE) { | |
1014 | PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n", | |
1015 | dev->name); | |
1016 | if (local->hostapd && local->apdev) { | |
1017 | /* Send IEEE 802.1X frames to the user | |
1018 | * space daemon for processing */ | |
1019 | prism2_rx_80211(local->apdev, skb, rx_stats, | |
1020 | PRISM2_RX_MGMT); | |
1021 | local->apdevstats.rx_packets++; | |
1022 | local->apdevstats.rx_bytes += skb->len; | |
1023 | goto rx_exit; | |
1024 | } | |
1025 | } else if (!frame_authorized) { | |
1026 | printk(KERN_DEBUG "%s: dropped frame from " | |
1027 | "unauthorized port (IEEE 802.1X): " | |
1028 | "ethertype=0x%04x\n", | |
1029 | dev->name, ethertype); | |
1030 | goto rx_dropped; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | /* convert hdr + possible LLC headers into Ethernet header */ | |
1035 | if (skb->len - hdrlen >= 8 && | |
1036 | ((memcmp(payload, rfc1042_header, 6) == 0 && | |
1037 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1038 | memcmp(payload, bridge_tunnel_header, 6) == 0)) { | |
1039 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1040 | * replace EtherType */ | |
1041 | skb_pull(skb, hdrlen + 6); | |
1042 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1043 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1044 | } else { | |
8a9faf3c | 1045 | __be16 len; |
ff1d2767 JM |
1046 | /* Leave Ethernet header part of hdr and full payload */ |
1047 | skb_pull(skb, hdrlen); | |
1048 | len = htons(skb->len); | |
1049 | memcpy(skb_push(skb, 2), &len, 2); | |
1050 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1051 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1052 | } | |
1053 | ||
b2f4a2e3 JM |
1054 | if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
1055 | IEEE80211_FCTL_TODS) && | |
ff1d2767 JM |
1056 | skb->len >= ETH_HLEN + ETH_ALEN) { |
1057 | /* Non-standard frame: get addr4 from its bogus location after | |
1058 | * the payload */ | |
d626f62b ACM |
1059 | skb_copy_from_linear_data_offset(skb, skb->len - ETH_ALEN, |
1060 | skb->data + ETH_ALEN, | |
1061 | ETH_ALEN); | |
ff1d2767 JM |
1062 | skb_trim(skb, skb->len - ETH_ALEN); |
1063 | } | |
1064 | ||
4cfa8e45 SH |
1065 | dev->stats.rx_packets++; |
1066 | dev->stats.rx_bytes += skb->len; | |
ff1d2767 JM |
1067 | |
1068 | if (local->iw_mode == IW_MODE_MASTER && !wds && | |
1069 | local->ap->bridge_packets) { | |
1070 | if (dst[0] & 0x01) { | |
1071 | /* copy multicast frame both to the higher layers and | |
1072 | * to the wireless media */ | |
1073 | local->ap->bridged_multicast++; | |
1074 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1075 | if (skb2 == NULL) | |
1076 | printk(KERN_DEBUG "%s: skb_clone failed for " | |
1077 | "multicast frame\n", dev->name); | |
1078 | } else if (hostap_is_sta_authorized(local->ap, dst)) { | |
1079 | /* send frame directly to the associated STA using | |
1080 | * wireless media and not passing to higher layers */ | |
1081 | local->ap->bridged_unicast++; | |
1082 | skb2 = skb; | |
1083 | skb = NULL; | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | if (skb2 != NULL) { | |
1088 | /* send to wireless media */ | |
459a98ed | 1089 | skb2->dev = dev; |
c1b4aa3f | 1090 | skb2->protocol = cpu_to_be16(ETH_P_802_3); |
459a98ed | 1091 | skb_reset_mac_header(skb2); |
c1d2bbe1 | 1092 | skb_reset_network_header(skb2); |
b0e380b1 | 1093 | /* skb2->network_header += ETH_HLEN; */ |
ff1d2767 JM |
1094 | dev_queue_xmit(skb2); |
1095 | } | |
1096 | ||
1097 | if (skb) { | |
1098 | skb->protocol = eth_type_trans(skb, dev); | |
1099 | memset(skb->cb, 0, sizeof(skb->cb)); | |
ff1d2767 JM |
1100 | netif_rx(skb); |
1101 | } | |
1102 | ||
1103 | rx_exit: | |
1104 | if (sta) | |
1105 | hostap_handle_sta_release(sta); | |
1106 | return; | |
1107 | ||
1108 | rx_dropped: | |
1109 | dev_kfree_skb(skb); | |
1110 | ||
4cfa8e45 | 1111 | dev->stats.rx_dropped++; |
ff1d2767 JM |
1112 | goto rx_exit; |
1113 | } | |
1114 | ||
1115 | ||
1116 | EXPORT_SYMBOL(hostap_80211_rx); |