1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2007-2012 Siemens AG |
4 | * |
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> |
14 | #include <linux/netdevice.h> |
15 | #include <linux/crc-ccitt.h> |
16 | #include <asm/unaligned.h> |
17 | |
18 | #include <net/mac802154.h> |
19 | #include <net/ieee802154_netdev.h> |
20 | #include <net/nl802154.h> |
21 | |
22 | #include "ieee802154_i.h" |
23 | |
24 | static int ieee802154_deliver_skb(struct sk_buff *skb) |
25 | { |
26 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
27 | skb->protocol = htons(ETH_P_IEEE802154); |
28 | |
29 | return netif_receive_skb(skb); |
30 | } |
31 | |
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, skb: mac_pkt->skb, page: mac_pkt->page, channel: mac_pkt->channel); |
44 | |
45 | list_del(entry: &mac_pkt->node); |
46 | kfree_skb(skb: mac_pkt->skb); |
47 | kfree(objp: mac_pkt); |
48 | } |
49 | |
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(skb: mac_pkt->skb, mac_cmd: &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(wq: local->mac_wq, dwork: &local->beacon_work, delay: 0); |
95 | break; |
96 | default: |
97 | break; |
98 | } |
99 | |
100 | out: |
101 | list_del(entry: &mac_pkt->node); |
102 | kfree_skb(skb: mac_pkt->skb); |
103 | kfree(objp: mac_pkt); |
104 | } |
105 | |
106 | static int |
107 | ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata, |
108 | struct sk_buff *skb, const struct ieee802154_hdr *hdr) |
109 | { |
110 | struct wpan_phy *wpan_phy = sdata->local->hw.phy; |
111 | struct wpan_dev *wpan_dev = &sdata->wpan_dev; |
112 | struct cfg802154_mac_pkt *mac_pkt; |
113 | __le16 span, sshort; |
114 | int rc; |
115 | |
116 | pr_debug("getting packet via slave interface %s\n" , sdata->dev->name); |
117 | |
118 | span = wpan_dev->pan_id; |
119 | sshort = wpan_dev->short_addr; |
120 | |
121 | /* Level 3 filtering: Only beacons are accepted during scans */ |
122 | if (sdata->required_filtering == IEEE802154_FILTERING_3_SCAN && |
123 | sdata->required_filtering > wpan_phy->filtering) { |
124 | if (mac_cb(skb)->type != IEEE802154_FC_TYPE_BEACON) { |
125 | dev_dbg(&sdata->dev->dev, |
126 | "drop non-beacon frame (0x%x) during scan\n" , |
127 | mac_cb(skb)->type); |
128 | goto fail; |
129 | } |
130 | } |
131 | |
132 | switch (mac_cb(skb)->dest.mode) { |
133 | case IEEE802154_ADDR_NONE: |
134 | if (hdr->source.mode != IEEE802154_ADDR_NONE) |
135 | /* FIXME: check if we are PAN coordinator */ |
136 | skb->pkt_type = PACKET_OTHERHOST; |
137 | else |
138 | /* ACK comes with both addresses empty */ |
139 | skb->pkt_type = PACKET_HOST; |
140 | break; |
141 | case IEEE802154_ADDR_LONG: |
142 | if (mac_cb(skb)->dest.pan_id != span && |
143 | mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) |
144 | skb->pkt_type = PACKET_OTHERHOST; |
145 | else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr) |
146 | skb->pkt_type = PACKET_HOST; |
147 | else |
148 | skb->pkt_type = PACKET_OTHERHOST; |
149 | break; |
150 | case IEEE802154_ADDR_SHORT: |
151 | if (mac_cb(skb)->dest.pan_id != span && |
152 | mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) |
153 | skb->pkt_type = PACKET_OTHERHOST; |
154 | else if (mac_cb(skb)->dest.short_addr == sshort) |
155 | skb->pkt_type = PACKET_HOST; |
156 | else if (mac_cb(skb)->dest.short_addr == |
157 | cpu_to_le16(IEEE802154_ADDR_BROADCAST)) |
158 | skb->pkt_type = PACKET_BROADCAST; |
159 | else |
160 | skb->pkt_type = PACKET_OTHERHOST; |
161 | break; |
162 | default: |
163 | pr_debug("invalid dest mode\n" ); |
164 | goto fail; |
165 | } |
166 | |
167 | skb->dev = sdata->dev; |
168 | |
169 | /* TODO this should be moved after netif_receive_skb call, otherwise |
170 | * wireshark will show a mac header with security fields and the |
171 | * payload is already decrypted. |
172 | */ |
173 | rc = mac802154_llsec_decrypt(sec: &sdata->sec, skb); |
174 | if (rc) { |
175 | pr_debug("decryption failed: %i\n" , rc); |
176 | goto fail; |
177 | } |
178 | |
179 | sdata->dev->stats.rx_packets++; |
180 | sdata->dev->stats.rx_bytes += skb->len; |
181 | |
182 | switch (mac_cb(skb)->type) { |
183 | case IEEE802154_FC_TYPE_BEACON: |
184 | dev_dbg(&sdata->dev->dev, "BEACON received\n" ); |
185 | if (!mac802154_is_scanning(local: sdata->local)) |
186 | goto fail; |
187 | |
188 | mac_pkt = kzalloc(size: sizeof(*mac_pkt), GFP_ATOMIC); |
189 | if (!mac_pkt) |
190 | goto fail; |
191 | |
192 | mac_pkt->skb = skb_get(skb); |
193 | mac_pkt->sdata = sdata; |
194 | mac_pkt->page = sdata->local->scan_page; |
195 | mac_pkt->channel = sdata->local->scan_channel; |
196 | list_add_tail(new: &mac_pkt->node, head: &sdata->local->rx_beacon_list); |
197 | queue_work(wq: sdata->local->mac_wq, work: &sdata->local->rx_beacon_work); |
198 | return NET_RX_SUCCESS; |
199 | |
200 | case IEEE802154_FC_TYPE_MAC_CMD: |
201 | dev_dbg(&sdata->dev->dev, "MAC COMMAND received\n" ); |
202 | mac_pkt = kzalloc(size: sizeof(*mac_pkt), GFP_ATOMIC); |
203 | if (!mac_pkt) |
204 | goto fail; |
205 | |
206 | mac_pkt->skb = skb_get(skb); |
207 | mac_pkt->sdata = sdata; |
208 | list_add_tail(new: &mac_pkt->node, head: &sdata->local->rx_mac_cmd_list); |
209 | queue_work(wq: sdata->local->mac_wq, work: &sdata->local->rx_mac_cmd_work); |
210 | return NET_RX_SUCCESS; |
211 | |
212 | case IEEE802154_FC_TYPE_ACK: |
213 | goto fail; |
214 | |
215 | case IEEE802154_FC_TYPE_DATA: |
216 | return ieee802154_deliver_skb(skb); |
217 | default: |
218 | pr_warn_ratelimited("ieee802154: bad frame received " |
219 | "(type = %d)\n" , mac_cb(skb)->type); |
220 | goto fail; |
221 | } |
222 | |
223 | fail: |
224 | kfree_skb(skb); |
225 | return NET_RX_DROP; |
226 | } |
227 | |
228 | static void |
229 | ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr) |
230 | { |
231 | if (addr->mode == IEEE802154_ADDR_NONE) { |
232 | pr_debug("%s not present\n" , name); |
233 | return; |
234 | } |
235 | |
236 | pr_debug("%s PAN ID: %04x\n" , name, le16_to_cpu(addr->pan_id)); |
237 | if (addr->mode == IEEE802154_ADDR_SHORT) { |
238 | pr_debug("%s is short: %04x\n" , name, |
239 | le16_to_cpu(addr->short_addr)); |
240 | } else { |
241 | u64 hw = swab64((__force u64)addr->extended_addr); |
242 | |
243 | pr_debug("%s is hardware: %8phC\n" , name, &hw); |
244 | } |
245 | } |
246 | |
247 | static int |
248 | ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr) |
249 | { |
250 | int hlen; |
251 | struct ieee802154_mac_cb *cb = mac_cb(skb); |
252 | |
253 | skb_reset_mac_header(skb); |
254 | |
255 | hlen = ieee802154_hdr_pull(skb, hdr); |
256 | if (hlen < 0) |
257 | return -EINVAL; |
258 | |
259 | skb->mac_len = hlen; |
260 | |
261 | pr_debug("fc: %04x dsn: %02x\n" , le16_to_cpup((__le16 *)&hdr->fc), |
262 | hdr->seq); |
263 | |
264 | cb->type = hdr->fc.type; |
265 | cb->ackreq = hdr->fc.ack_request; |
266 | cb->secen = hdr->fc.security_enabled; |
267 | |
268 | ieee802154_print_addr(name: "destination" , addr: &hdr->dest); |
269 | ieee802154_print_addr(name: "source" , addr: &hdr->source); |
270 | |
271 | cb->source = hdr->source; |
272 | cb->dest = hdr->dest; |
273 | |
274 | if (hdr->fc.security_enabled) { |
275 | u64 key; |
276 | |
277 | pr_debug("seclevel %i\n" , hdr->sec.level); |
278 | |
279 | switch (hdr->sec.key_id_mode) { |
280 | case IEEE802154_SCF_KEY_IMPLICIT: |
281 | pr_debug("implicit key\n" ); |
282 | break; |
283 | |
284 | case IEEE802154_SCF_KEY_INDEX: |
285 | pr_debug("key %02x\n" , hdr->sec.key_id); |
286 | break; |
287 | |
288 | case IEEE802154_SCF_KEY_SHORT_INDEX: |
289 | pr_debug("key %04x:%04x %02x\n" , |
290 | le32_to_cpu(hdr->sec.short_src) >> 16, |
291 | le32_to_cpu(hdr->sec.short_src) & 0xffff, |
292 | hdr->sec.key_id); |
293 | break; |
294 | |
295 | case IEEE802154_SCF_KEY_HW_INDEX: |
296 | key = swab64((__force u64)hdr->sec.extended_src); |
297 | pr_debug("key source %8phC %02x\n" , &key, |
298 | hdr->sec.key_id); |
299 | break; |
300 | } |
301 | } |
302 | |
303 | return 0; |
304 | } |
305 | |
306 | static void |
307 | __ieee802154_rx_handle_packet(struct ieee802154_local *local, |
308 | struct sk_buff *skb) |
309 | { |
310 | int ret; |
311 | struct ieee802154_sub_if_data *sdata; |
312 | struct ieee802154_hdr hdr; |
313 | struct sk_buff *skb2; |
314 | |
315 | ret = ieee802154_parse_frame_start(skb, hdr: &hdr); |
316 | if (ret) { |
317 | pr_debug("got invalid frame\n" ); |
318 | return; |
319 | } |
320 | |
321 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
322 | if (sdata->wpan_dev.iftype == NL802154_IFTYPE_MONITOR) |
323 | continue; |
324 | |
325 | if (!ieee802154_sdata_running(sdata)) |
326 | continue; |
327 | |
328 | /* Do not deliver packets received on interfaces expecting |
329 | * AACK=1 if the address filters where disabled. |
330 | */ |
331 | if (local->hw.phy->filtering < IEEE802154_FILTERING_4_FRAME_FIELDS && |
332 | sdata->required_filtering == IEEE802154_FILTERING_4_FRAME_FIELDS) |
333 | continue; |
334 | |
335 | skb2 = skb_clone(skb, GFP_ATOMIC); |
336 | if (skb2) { |
337 | skb2->dev = sdata->dev; |
338 | ieee802154_subif_frame(sdata, skb: skb2, hdr: &hdr); |
339 | } |
340 | } |
341 | } |
342 | |
343 | static void |
344 | ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb) |
345 | { |
346 | struct sk_buff *skb2; |
347 | struct ieee802154_sub_if_data *sdata; |
348 | |
349 | skb_reset_mac_header(skb); |
350 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
351 | skb->pkt_type = PACKET_OTHERHOST; |
352 | skb->protocol = htons(ETH_P_IEEE802154); |
353 | |
354 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
355 | if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR) |
356 | continue; |
357 | |
358 | if (!ieee802154_sdata_running(sdata)) |
359 | continue; |
360 | |
361 | skb2 = skb_clone(skb, GFP_ATOMIC); |
362 | if (skb2) { |
363 | skb2->dev = sdata->dev; |
364 | ieee802154_deliver_skb(skb: skb2); |
365 | |
366 | sdata->dev->stats.rx_packets++; |
367 | sdata->dev->stats.rx_bytes += skb->len; |
368 | } |
369 | } |
370 | } |
371 | |
372 | void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb) |
373 | { |
374 | u16 crc; |
375 | |
376 | WARN_ON_ONCE(softirq_count() == 0); |
377 | |
378 | if (local->suspended) |
379 | goto free_skb; |
380 | |
381 | /* TODO: When a transceiver omits the checksum here, we |
382 | * add an own calculated one. This is currently an ugly |
383 | * solution because the monitor needs a crc here. |
384 | */ |
385 | if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) { |
386 | crc = crc_ccitt(crc: 0, buffer: skb->data, len: skb->len); |
387 | put_unaligned_le16(val: crc, p: skb_put(skb, len: 2)); |
388 | } |
389 | |
390 | rcu_read_lock(); |
391 | |
392 | ieee802154_monitors_rx(local, skb); |
393 | |
394 | /* Level 1 filtering: Check the FCS by software when relevant */ |
395 | if (local->hw.phy->filtering == IEEE802154_FILTERING_NONE) { |
396 | crc = crc_ccitt(crc: 0, buffer: skb->data, len: skb->len); |
397 | if (crc) |
398 | goto drop; |
399 | } |
400 | /* remove crc */ |
401 | skb_trim(skb, len: skb->len - 2); |
402 | |
403 | __ieee802154_rx_handle_packet(local, skb); |
404 | |
405 | drop: |
406 | rcu_read_unlock(); |
407 | free_skb: |
408 | kfree_skb(skb); |
409 | } |
410 | |
411 | void |
412 | ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi) |
413 | { |
414 | struct ieee802154_local *local = hw_to_local(hw); |
415 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); |
416 | |
417 | cb->lqi = lqi; |
418 | skb->pkt_type = IEEE802154_RX_MSG; |
419 | skb_queue_tail(list: &local->skb_queue, newsk: skb); |
420 | tasklet_schedule(t: &local->tasklet); |
421 | } |
422 | EXPORT_SYMBOL(ieee802154_rx_irqsafe); |
423 | |