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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1cd829c8 | 2 | /* |
3 | * Copyright (C) 2007-2012 Siemens AG | |
4 | * | |
1cd829c8 | 5 | * Written by: |
6 | * Pavel Smolenskiy <pavel.smolenskiy@gmail.com> | |
7 | * Maxim Gorbachyov <maxim.gorbachev@siemens.com> | |
8 | * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> | |
9 | * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
1cd829c8 | 14 | #include <linux/netdevice.h> |
15 | #include <linux/crc-ccitt.h> | |
b7889497 | 16 | #include <asm/unaligned.h> |
1cd829c8 | 17 | |
18 | #include <net/mac802154.h> | |
19 | #include <net/ieee802154_netdev.h> | |
944742a3 | 20 | #include <net/nl802154.h> |
1cd829c8 | 21 | |
0f1556bc | 22 | #include "ieee802154_i.h" |
1cd829c8 | 23 | |
08c511a7 | 24 | static int ieee802154_deliver_skb(struct sk_buff *skb) |
2a9820c9 | 25 | { |
75a46f0e | 26 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
702dcf99 AA |
27 | skb->protocol = htons(ETH_P_IEEE802154); |
28 | ||
2a9820c9 AA |
29 | return netif_receive_skb(skb); |
30 | } | |
31 | ||
57588c71 MR |
32 | void mac802154_rx_beacon_worker(struct work_struct *work) |
33 | { | |
34 | struct ieee802154_local *local = | |
35 | container_of(work, struct ieee802154_local, rx_beacon_work); | |
36 | struct cfg802154_mac_pkt *mac_pkt; | |
37 | ||
38 | mac_pkt = list_first_entry_or_null(&local->rx_beacon_list, | |
39 | struct cfg802154_mac_pkt, node); | |
40 | if (!mac_pkt) | |
41 | return; | |
42 | ||
43 | mac802154_process_beacon(local, mac_pkt->skb, mac_pkt->page, mac_pkt->channel); | |
44 | ||
45 | list_del(&mac_pkt->node); | |
46 | kfree_skb(mac_pkt->skb); | |
47 | kfree(mac_pkt); | |
48 | } | |
49 | ||
d021d218 MR |
50 | static bool mac802154_should_answer_beacon_req(struct ieee802154_local *local) |
51 | { | |
52 | struct cfg802154_beacon_request *beacon_req; | |
53 | unsigned int interval; | |
54 | ||
55 | rcu_read_lock(); | |
56 | beacon_req = rcu_dereference(local->beacon_req); | |
57 | if (!beacon_req) { | |
58 | rcu_read_unlock(); | |
59 | return false; | |
60 | } | |
61 | ||
62 | interval = beacon_req->interval; | |
63 | rcu_read_unlock(); | |
64 | ||
65 | if (!mac802154_is_beaconing(local)) | |
66 | return false; | |
67 | ||
68 | return interval == IEEE802154_ACTIVE_SCAN_DURATION; | |
69 | } | |
70 | ||
71 | void mac802154_rx_mac_cmd_worker(struct work_struct *work) | |
72 | { | |
73 | struct ieee802154_local *local = | |
74 | container_of(work, struct ieee802154_local, rx_mac_cmd_work); | |
75 | struct cfg802154_mac_pkt *mac_pkt; | |
76 | u8 mac_cmd; | |
77 | int rc; | |
78 | ||
79 | mac_pkt = list_first_entry_or_null(&local->rx_mac_cmd_list, | |
80 | struct cfg802154_mac_pkt, node); | |
81 | if (!mac_pkt) | |
82 | return; | |
83 | ||
84 | rc = ieee802154_get_mac_cmd(mac_pkt->skb, &mac_cmd); | |
85 | if (rc) | |
86 | goto out; | |
87 | ||
88 | switch (mac_cmd) { | |
89 | case IEEE802154_CMD_BEACON_REQ: | |
90 | dev_dbg(&mac_pkt->sdata->dev->dev, "processing BEACON REQ\n"); | |
91 | if (!mac802154_should_answer_beacon_req(local)) | |
92 | break; | |
93 | ||
94 | queue_delayed_work(local->mac_wq, &local->beacon_work, 0); | |
95 | break; | |
fefd1980 MR |
96 | |
97 | case IEEE802154_CMD_ASSOCIATION_RESP: | |
98 | dev_dbg(&mac_pkt->sdata->dev->dev, "processing ASSOC RESP\n"); | |
99 | if (!mac802154_is_associating(local)) | |
100 | break; | |
101 | ||
102 | mac802154_process_association_resp(mac_pkt->sdata, mac_pkt->skb); | |
103 | break; | |
104 | ||
601f160b MR |
105 | case IEEE802154_CMD_ASSOCIATION_REQ: |
106 | dev_dbg(&mac_pkt->sdata->dev->dev, "processing ASSOC REQ\n"); | |
107 | if (mac_pkt->sdata->wpan_dev.iftype != NL802154_IFTYPE_COORD) | |
108 | break; | |
109 | ||
110 | mac802154_process_association_req(mac_pkt->sdata, mac_pkt->skb); | |
111 | break; | |
112 | ||
1e2a45f1 MR |
113 | case IEEE802154_CMD_DISASSOCIATION_NOTIFY: |
114 | dev_dbg(&mac_pkt->sdata->dev->dev, "processing DISASSOC NOTIF\n"); | |
115 | if (mac_pkt->sdata->wpan_dev.iftype != NL802154_IFTYPE_COORD) | |
116 | break; | |
117 | ||
118 | mac802154_process_disassociation_notif(mac_pkt->sdata, mac_pkt->skb); | |
119 | break; | |
120 | ||
d021d218 MR |
121 | default: |
122 | break; | |
123 | } | |
124 | ||
125 | out: | |
126 | list_del(&mac_pkt->node); | |
127 | kfree_skb(mac_pkt->skb); | |
128 | kfree(mac_pkt); | |
129 | } | |
130 | ||
2a9820c9 | 131 | static int |
be9d215f AA |
132 | ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata, |
133 | struct sk_buff *skb, const struct ieee802154_hdr *hdr) | |
2a9820c9 | 134 | { |
4161634b | 135 | struct wpan_phy *wpan_phy = sdata->local->hw.phy; |
57588c71 MR |
136 | struct wpan_dev *wpan_dev = &sdata->wpan_dev; |
137 | struct cfg802154_mac_pkt *mac_pkt; | |
2a9820c9 AA |
138 | __le16 span, sshort; |
139 | int rc; | |
140 | ||
141 | pr_debug("getting packet via slave interface %s\n", sdata->dev->name); | |
142 | ||
863e88f2 AA |
143 | span = wpan_dev->pan_id; |
144 | sshort = wpan_dev->short_addr; | |
2a9820c9 | 145 | |
4161634b MR |
146 | /* Level 3 filtering: Only beacons are accepted during scans */ |
147 | if (sdata->required_filtering == IEEE802154_FILTERING_3_SCAN && | |
148 | sdata->required_filtering > wpan_phy->filtering) { | |
149 | if (mac_cb(skb)->type != IEEE802154_FC_TYPE_BEACON) { | |
150 | dev_dbg(&sdata->dev->dev, | |
151 | "drop non-beacon frame (0x%x) during scan\n", | |
152 | mac_cb(skb)->type); | |
153 | goto fail; | |
154 | } | |
155 | } | |
156 | ||
2a9820c9 AA |
157 | switch (mac_cb(skb)->dest.mode) { |
158 | case IEEE802154_ADDR_NONE: | |
e9dc1bc9 | 159 | if (hdr->source.mode == IEEE802154_ADDR_NONE) |
2a9820c9 AA |
160 | /* ACK comes with both addresses empty */ |
161 | skb->pkt_type = PACKET_HOST; | |
e9dc1bc9 MR |
162 | else if (!wpan_dev->parent) |
163 | /* No dest means PAN coordinator is the recipient */ | |
164 | skb->pkt_type = PACKET_HOST; | |
165 | else | |
166 | /* We are not the PAN coordinator, just relaying */ | |
167 | skb->pkt_type = PACKET_OTHERHOST; | |
2a9820c9 AA |
168 | break; |
169 | case IEEE802154_ADDR_LONG: | |
170 | if (mac_cb(skb)->dest.pan_id != span && | |
171 | mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) | |
172 | skb->pkt_type = PACKET_OTHERHOST; | |
863e88f2 | 173 | else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr) |
2a9820c9 AA |
174 | skb->pkt_type = PACKET_HOST; |
175 | else | |
176 | skb->pkt_type = PACKET_OTHERHOST; | |
177 | break; | |
178 | case IEEE802154_ADDR_SHORT: | |
179 | if (mac_cb(skb)->dest.pan_id != span && | |
180 | mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) | |
181 | skb->pkt_type = PACKET_OTHERHOST; | |
182 | else if (mac_cb(skb)->dest.short_addr == sshort) | |
183 | skb->pkt_type = PACKET_HOST; | |
184 | else if (mac_cb(skb)->dest.short_addr == | |
185 | cpu_to_le16(IEEE802154_ADDR_BROADCAST)) | |
186 | skb->pkt_type = PACKET_BROADCAST; | |
187 | else | |
188 | skb->pkt_type = PACKET_OTHERHOST; | |
189 | break; | |
190 | default: | |
2a9820c9 | 191 | pr_debug("invalid dest mode\n"); |
bcb47aab | 192 | goto fail; |
2a9820c9 AA |
193 | } |
194 | ||
2a9820c9 AA |
195 | skb->dev = sdata->dev; |
196 | ||
d58a2fa9 AA |
197 | /* TODO this should be moved after netif_receive_skb call, otherwise |
198 | * wireshark will show a mac header with security fields and the | |
199 | * payload is already decrypted. | |
200 | */ | |
2a9820c9 AA |
201 | rc = mac802154_llsec_decrypt(&sdata->sec, skb); |
202 | if (rc) { | |
203 | pr_debug("decryption failed: %i\n", rc); | |
204 | goto fail; | |
205 | } | |
206 | ||
207 | sdata->dev->stats.rx_packets++; | |
208 | sdata->dev->stats.rx_bytes += skb->len; | |
209 | ||
210 | switch (mac_cb(skb)->type) { | |
ca1de81a | 211 | case IEEE802154_FC_TYPE_BEACON: |
57588c71 MR |
212 | dev_dbg(&sdata->dev->dev, "BEACON received\n"); |
213 | if (!mac802154_is_scanning(sdata->local)) | |
214 | goto fail; | |
215 | ||
216 | mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC); | |
217 | if (!mac_pkt) | |
218 | goto fail; | |
219 | ||
220 | mac_pkt->skb = skb_get(skb); | |
221 | mac_pkt->sdata = sdata; | |
222 | mac_pkt->page = sdata->local->scan_page; | |
223 | mac_pkt->channel = sdata->local->scan_channel; | |
224 | list_add_tail(&mac_pkt->node, &sdata->local->rx_beacon_list); | |
225 | queue_work(sdata->local->mac_wq, &sdata->local->rx_beacon_work); | |
226 | return NET_RX_SUCCESS; | |
d021d218 | 227 | |
ca1de81a | 228 | case IEEE802154_FC_TYPE_MAC_CMD: |
d021d218 MR |
229 | dev_dbg(&sdata->dev->dev, "MAC COMMAND received\n"); |
230 | mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC); | |
231 | if (!mac_pkt) | |
232 | goto fail; | |
233 | ||
234 | mac_pkt->skb = skb_get(skb); | |
235 | mac_pkt->sdata = sdata; | |
236 | list_add_tail(&mac_pkt->node, &sdata->local->rx_mac_cmd_list); | |
237 | queue_work(sdata->local->mac_wq, &sdata->local->rx_mac_cmd_work); | |
238 | return NET_RX_SUCCESS; | |
239 | ||
240 | case IEEE802154_FC_TYPE_ACK: | |
ca1de81a AR |
241 | goto fail; |
242 | ||
2a9820c9 | 243 | case IEEE802154_FC_TYPE_DATA: |
08c511a7 | 244 | return ieee802154_deliver_skb(skb); |
2a9820c9 | 245 | default: |
bd89bb6d AR |
246 | pr_warn_ratelimited("ieee802154: bad frame received " |
247 | "(type = %d)\n", mac_cb(skb)->type); | |
2a9820c9 AA |
248 | goto fail; |
249 | } | |
250 | ||
251 | fail: | |
252 | kfree_skb(skb); | |
253 | return NET_RX_DROP; | |
254 | } | |
255 | ||
be9d215f AA |
256 | static void |
257 | ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr) | |
2a9820c9 | 258 | { |
3a22550a | 259 | if (addr->mode == IEEE802154_ADDR_NONE) { |
2a9820c9 | 260 | pr_debug("%s not present\n", name); |
3a22550a MR |
261 | return; |
262 | } | |
2a9820c9 AA |
263 | |
264 | pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id)); | |
265 | if (addr->mode == IEEE802154_ADDR_SHORT) { | |
266 | pr_debug("%s is short: %04x\n", name, | |
267 | le16_to_cpu(addr->short_addr)); | |
268 | } else { | |
269 | u64 hw = swab64((__force u64)addr->extended_addr); | |
270 | ||
271 | pr_debug("%s is hardware: %8phC\n", name, &hw); | |
272 | } | |
273 | } | |
274 | ||
be9d215f AA |
275 | static int |
276 | ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr) | |
2a9820c9 AA |
277 | { |
278 | int hlen; | |
5a5c4e06 | 279 | struct ieee802154_mac_cb *cb = mac_cb(skb); |
2a9820c9 | 280 | |
9cf215d0 AA |
281 | skb_reset_mac_header(skb); |
282 | ||
2a9820c9 AA |
283 | hlen = ieee802154_hdr_pull(skb, hdr); |
284 | if (hlen < 0) | |
285 | return -EINVAL; | |
286 | ||
287 | skb->mac_len = hlen; | |
288 | ||
289 | pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc), | |
290 | hdr->seq); | |
291 | ||
292 | cb->type = hdr->fc.type; | |
293 | cb->ackreq = hdr->fc.ack_request; | |
294 | cb->secen = hdr->fc.security_enabled; | |
295 | ||
be9d215f AA |
296 | ieee802154_print_addr("destination", &hdr->dest); |
297 | ieee802154_print_addr("source", &hdr->source); | |
2a9820c9 AA |
298 | |
299 | cb->source = hdr->source; | |
300 | cb->dest = hdr->dest; | |
301 | ||
302 | if (hdr->fc.security_enabled) { | |
303 | u64 key; | |
304 | ||
305 | pr_debug("seclevel %i\n", hdr->sec.level); | |
306 | ||
307 | switch (hdr->sec.key_id_mode) { | |
308 | case IEEE802154_SCF_KEY_IMPLICIT: | |
309 | pr_debug("implicit key\n"); | |
310 | break; | |
311 | ||
312 | case IEEE802154_SCF_KEY_INDEX: | |
313 | pr_debug("key %02x\n", hdr->sec.key_id); | |
314 | break; | |
315 | ||
316 | case IEEE802154_SCF_KEY_SHORT_INDEX: | |
317 | pr_debug("key %04x:%04x %02x\n", | |
318 | le32_to_cpu(hdr->sec.short_src) >> 16, | |
319 | le32_to_cpu(hdr->sec.short_src) & 0xffff, | |
320 | hdr->sec.key_id); | |
321 | break; | |
322 | ||
323 | case IEEE802154_SCF_KEY_HW_INDEX: | |
324 | key = swab64((__force u64)hdr->sec.extended_src); | |
325 | pr_debug("key source %8phC %02x\n", &key, | |
326 | hdr->sec.key_id); | |
327 | break; | |
328 | } | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static void | |
be9d215f AA |
335 | __ieee802154_rx_handle_packet(struct ieee802154_local *local, |
336 | struct sk_buff *skb) | |
2a9820c9 AA |
337 | { |
338 | int ret; | |
339 | struct ieee802154_sub_if_data *sdata; | |
340 | struct ieee802154_hdr hdr; | |
2622e785 | 341 | struct sk_buff *skb2; |
2a9820c9 | 342 | |
be9d215f | 343 | ret = ieee802154_parse_frame_start(skb, &hdr); |
2a9820c9 AA |
344 | if (ret) { |
345 | pr_debug("got invalid frame\n"); | |
2a9820c9 AA |
346 | return; |
347 | } | |
348 | ||
2a9820c9 | 349 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2622e785 | 350 | if (sdata->wpan_dev.iftype == NL802154_IFTYPE_MONITOR) |
1bc1754e VB |
351 | continue; |
352 | ||
353 | if (!ieee802154_sdata_running(sdata)) | |
2a9820c9 AA |
354 | continue; |
355 | ||
0218277d MR |
356 | /* Do not deliver packets received on interfaces expecting |
357 | * AACK=1 if the address filters where disabled. | |
358 | */ | |
359 | if (local->hw.phy->filtering < IEEE802154_FILTERING_4_FRAME_FIELDS && | |
360 | sdata->required_filtering == IEEE802154_FILTERING_4_FRAME_FIELDS) | |
361 | continue; | |
362 | ||
2622e785 MR |
363 | skb2 = skb_clone(skb, GFP_ATOMIC); |
364 | if (skb2) { | |
365 | skb2->dev = sdata->dev; | |
366 | ieee802154_subif_frame(sdata, skb2, &hdr); | |
367 | } | |
2a9820c9 | 368 | } |
2a9820c9 AA |
369 | } |
370 | ||
4ca18be5 | 371 | static void |
be9d215f | 372 | ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb) |
2a9820c9 AA |
373 | { |
374 | struct sk_buff *skb2; | |
375 | struct ieee802154_sub_if_data *sdata; | |
2a9820c9 | 376 | |
9cf215d0 | 377 | skb_reset_mac_header(skb); |
75a46f0e | 378 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
c9ca6401 | 379 | skb->pkt_type = PACKET_OTHERHOST; |
702dcf99 AA |
380 | skb->protocol = htons(ETH_P_IEEE802154); |
381 | ||
2a9820c9 | 382 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
ed65963b | 383 | if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR) |
20b48120 AA |
384 | continue; |
385 | ||
386 | if (!ieee802154_sdata_running(sdata)) | |
2a9820c9 AA |
387 | continue; |
388 | ||
389 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
05f7de67 AA |
390 | if (skb2) { |
391 | skb2->dev = sdata->dev; | |
392 | ieee802154_deliver_skb(skb2); | |
2a9820c9 | 393 | |
05f7de67 AA |
394 | sdata->dev->stats.rx_packets++; |
395 | sdata->dev->stats.rx_bytes += skb->len; | |
396 | } | |
2a9820c9 | 397 | } |
2a9820c9 AA |
398 | } |
399 | ||
d10270ce | 400 | void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb) |
1cd829c8 | 401 | { |
ec718f3d | 402 | u16 crc; |
1cd829c8 | 403 | |
469100d6 AA |
404 | WARN_ON_ONCE(softirq_count() == 0); |
405 | ||
3cf24cf8 | 406 | if (local->suspended) |
4d1c7d87 | 407 | goto free_skb; |
3cf24cf8 | 408 | |
b7889497 AA |
409 | /* TODO: When a transceiver omits the checksum here, we |
410 | * add an own calculated one. This is currently an ugly | |
411 | * solution because the monitor needs a crc here. | |
412 | */ | |
413 | if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) { | |
ec718f3d | 414 | crc = crc_ccitt(0, skb->data, skb->len); |
b7889497 | 415 | put_unaligned_le16(crc, skb_put(skb, 2)); |
1cd829c8 | 416 | } |
417 | ||
e176b681 AA |
418 | rcu_read_lock(); |
419 | ||
be9d215f | 420 | ieee802154_monitors_rx(local, skb); |
2d3b5b0a | 421 | |
a4b5b4c5 MR |
422 | /* Level 1 filtering: Check the FCS by software when relevant */ |
423 | if (local->hw.phy->filtering == IEEE802154_FILTERING_NONE) { | |
ec718f3d | 424 | crc = crc_ccitt(0, skb->data, skb->len); |
4d1c7d87 | 425 | if (crc) |
3cf24cf8 | 426 | goto drop; |
ec718f3d | 427 | } |
b7889497 AA |
428 | /* remove crc */ |
429 | skb_trim(skb, skb->len - 2); | |
e176b681 | 430 | |
b7889497 | 431 | __ieee802154_rx_handle_packet(local, skb); |
2d3b5b0a | 432 | |
3cf24cf8 | 433 | drop: |
4d1c7d87 MR |
434 | rcu_read_unlock(); |
435 | free_skb: | |
3cf24cf8 | 436 | kfree_skb(skb); |
1cd829c8 | 437 | } |
1cd829c8 | 438 | |
439 | void | |
5a504397 | 440 | ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi) |
1cd829c8 | 441 | { |
60741361 | 442 | struct ieee802154_local *local = hw_to_local(hw); |
5a5c4e06 | 443 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); |
1cd829c8 | 444 | |
5a5c4e06 | 445 | cb->lqi = lqi; |
c5c47e67 AA |
446 | skb->pkt_type = IEEE802154_RX_MSG; |
447 | skb_queue_tail(&local->skb_queue, skb); | |
448 | tasklet_schedule(&local->tasklet); | |
1cd829c8 | 449 | } |
450 | EXPORT_SYMBOL(ieee802154_rx_irqsafe); |