Commit | Line | Data |
---|---|---|
d57fec84 | 1 | /* Copyright 2011, Siemens AG |
44331fe2 AS |
2 | * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> |
3 | */ | |
4 | ||
d57fec84 | 5 | /* Based on patches from Jon Smirl <jonsmirl@gmail.com> |
44331fe2 AS |
6 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
44331fe2 AS |
16 | */ |
17 | ||
18 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
19 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
20 | * All rights reserved. | |
21 | * | |
22 | * Redistribution and use in source and binary forms, with or without | |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the above copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. Neither the name of the Institute nor the names of its contributors | |
31 | * may be used to endorse or promote products derived from this software | |
32 | * without specific prior written permission. | |
33 | * | |
34 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
35 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
36 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
37 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
38 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
39 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
40 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
41 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
42 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
43 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
44 | * SUCH DAMAGE. | |
45 | */ | |
46 | ||
44331fe2 AS |
47 | #include <linux/bitops.h> |
48 | #include <linux/if_arp.h> | |
49 | #include <linux/module.h> | |
50 | #include <linux/moduleparam.h> | |
51 | #include <linux/netdevice.h> | |
52 | #include <net/af_ieee802154.h> | |
53 | #include <net/ieee802154.h> | |
54 | #include <net/ieee802154_netdev.h> | |
cefc8c8a | 55 | #include <net/6lowpan.h> |
44331fe2 AS |
56 | #include <net/ipv6.h> |
57 | ||
7240cdec | 58 | #include "reassembly.h" |
44331fe2 | 59 | |
44331fe2 AS |
60 | static LIST_HEAD(lowpan_devices); |
61 | ||
44331fe2 AS |
62 | /* private device info */ |
63 | struct lowpan_dev_info { | |
64 | struct net_device *real_dev; /* real WPAN device ptr */ | |
65 | struct mutex dev_list_mtx; /* mutex for list ops */ | |
02600d0d | 66 | __be16 fragment_tag; |
44331fe2 AS |
67 | }; |
68 | ||
69 | struct lowpan_dev_record { | |
70 | struct net_device *ldev; | |
71 | struct list_head list; | |
72 | }; | |
73 | ||
74 | static inline struct | |
75 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
76 | { | |
77 | return netdev_priv(dev); | |
78 | } | |
79 | ||
80 | static inline void lowpan_address_flip(u8 *src, u8 *dest) | |
81 | { | |
82 | int i; | |
83 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) | |
84 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; | |
85 | } | |
86 | ||
44331fe2 AS |
87 | static int lowpan_header_create(struct sk_buff *skb, |
88 | struct net_device *dev, | |
89 | unsigned short type, const void *_daddr, | |
95c96174 | 90 | const void *_saddr, unsigned int len) |
44331fe2 | 91 | { |
44331fe2 AS |
92 | const u8 *saddr = _saddr; |
93 | const u8 *daddr = _daddr; | |
e6278d92 | 94 | struct ieee802154_addr sa, da; |
32edc40a | 95 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); |
44331fe2 | 96 | |
fc4e98db AA |
97 | /* TODO: |
98 | * if this package isn't ipv6 one, where should it be routed? | |
99 | */ | |
44331fe2 AS |
100 | if (type != ETH_P_IPV6) |
101 | return 0; | |
44331fe2 | 102 | |
44331fe2 AS |
103 | if (!saddr) |
104 | saddr = dev->dev_addr; | |
105 | ||
841a5ec7 AA |
106 | raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); |
107 | raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
44331fe2 | 108 | |
8df8c56a | 109 | lowpan_header_compress(skb, dev, type, daddr, saddr, len); |
44331fe2 | 110 | |
d57fec84 | 111 | /* NOTE1: I'm still unsure about the fact that compression and WPAN |
44331fe2 AS |
112 | * header are created here and not later in the xmit. So wait for |
113 | * an opinion of net maintainers. | |
114 | */ | |
d57fec84 | 115 | /* NOTE2: to be absolutely correct, we must derive PANid information |
44331fe2 AS |
116 | * from MAC subif of the 'dev' and 'real_dev' network devices, but |
117 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
118 | */ | |
32edc40a | 119 | cb->type = IEEE802154_FC_TYPE_DATA; |
58ef67c3 | 120 | |
8df8c56a | 121 | /* prepare wpan address data */ |
e6278d92 PB |
122 | sa.mode = IEEE802154_ADDR_LONG; |
123 | sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); | |
124 | sa.extended_addr = ieee802154_devaddr_from_raw(saddr); | |
43de7aa6 | 125 | |
8df8c56a | 126 | /* intra-PAN communications */ |
b70ab2e8 | 127 | da.pan_id = sa.pan_id; |
44331fe2 | 128 | |
d57fec84 | 129 | /* if the destination address is the broadcast address, use the |
8df8c56a JR |
130 | * corresponding short address |
131 | */ | |
132 | if (lowpan_is_addr_broadcast(daddr)) { | |
e6278d92 PB |
133 | da.mode = IEEE802154_ADDR_SHORT; |
134 | da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); | |
8df8c56a | 135 | } else { |
e6278d92 PB |
136 | da.mode = IEEE802154_ADDR_LONG; |
137 | da.extended_addr = ieee802154_devaddr_from_raw(daddr); | |
44331fe2 | 138 | } |
8df8c56a | 139 | |
32edc40a PB |
140 | cb->ackreq = !lowpan_is_addr_broadcast(daddr); |
141 | ||
8df8c56a | 142 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
d1d7358e | 143 | type, (void *)&da, (void *)&sa, 0); |
44331fe2 AS |
144 | } |
145 | ||
8df8c56a JR |
146 | static int lowpan_give_skb_to_devices(struct sk_buff *skb, |
147 | struct net_device *dev) | |
0c446212 AO |
148 | { |
149 | struct lowpan_dev_record *entry; | |
150 | struct sk_buff *skb_cp; | |
151 | int stat = NET_RX_SUCCESS; | |
152 | ||
153 | rcu_read_lock(); | |
154 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
155 | if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) { | |
156 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
157 | if (!skb_cp) { | |
158 | stat = -ENOMEM; | |
159 | break; | |
160 | } | |
161 | ||
162 | skb_cp->dev = entry->ldev; | |
163 | stat = netif_rx(skb_cp); | |
164 | } | |
165 | rcu_read_unlock(); | |
166 | ||
167 | return stat; | |
168 | } | |
169 | ||
ae531b94 | 170 | static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr) |
44331fe2 | 171 | { |
8df8c56a | 172 | u8 iphc0, iphc1; |
ae531b94 PB |
173 | struct ieee802154_addr_sa sa, da; |
174 | void *sap, *dap; | |
44331fe2 | 175 | |
841a5ec7 | 176 | raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len); |
44331fe2 AS |
177 | /* at least two bytes will be used for the encoding */ |
178 | if (skb->len < 2) | |
179 | goto drop; | |
c5d3687f | 180 | |
181 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
182 | goto drop; | |
719269af | 183 | |
c5d3687f | 184 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
185 | goto drop; | |
44331fe2 | 186 | |
ae531b94 PB |
187 | ieee802154_addr_to_sa(&sa, &hdr->source); |
188 | ieee802154_addr_to_sa(&da, &hdr->dest); | |
44331fe2 | 189 | |
ae531b94 PB |
190 | if (sa.addr_type == IEEE802154_ADDR_SHORT) |
191 | sap = &sa.short_addr; | |
192 | else | |
193 | sap = &sa.hwaddr; | |
194 | ||
195 | if (da.addr_type == IEEE802154_ADDR_SHORT) | |
196 | dap = &da.short_addr; | |
197 | else | |
198 | dap = &da.hwaddr; | |
199 | ||
200 | return lowpan_process_data(skb, skb->dev, sap, sa.addr_type, | |
201 | IEEE802154_ADDR_LEN, dap, da.addr_type, | |
202 | IEEE802154_ADDR_LEN, iphc0, iphc1, | |
203 | lowpan_give_skb_to_devices); | |
719269af | 204 | |
44331fe2 | 205 | drop: |
90d0963d | 206 | kfree_skb(skb); |
44331fe2 AS |
207 | return -EINVAL; |
208 | } | |
209 | ||
42c36295 | 210 | static int lowpan_set_address(struct net_device *dev, void *p) |
211 | { | |
212 | struct sockaddr *sa = p; | |
213 | ||
214 | if (netif_running(dev)) | |
215 | return -EBUSY; | |
216 | ||
217 | /* TODO: validate addr */ | |
218 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
d4b2816d PB |
223 | static struct sk_buff* |
224 | lowpan_alloc_frag(struct sk_buff *skb, int size, | |
225 | const struct ieee802154_hdr *master_hdr) | |
719269af | 226 | { |
d4b2816d | 227 | struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev; |
719269af | 228 | struct sk_buff *frag; |
d4b2816d PB |
229 | int rc; |
230 | ||
231 | frag = alloc_skb(real_dev->hard_header_len + | |
232 | real_dev->needed_tailroom + size, | |
233 | GFP_ATOMIC); | |
234 | ||
235 | if (likely(frag)) { | |
236 | frag->dev = real_dev; | |
237 | frag->priority = skb->priority; | |
238 | skb_reserve(frag, real_dev->hard_header_len); | |
239 | skb_reset_network_header(frag); | |
240 | *mac_cb(frag) = *mac_cb(skb); | |
241 | ||
242 | rc = dev_hard_header(frag, real_dev, 0, &master_hdr->dest, | |
243 | &master_hdr->source, size); | |
244 | if (rc < 0) { | |
245 | kfree_skb(frag); | |
246 | return ERR_PTR(-rc); | |
247 | } | |
248 | } else { | |
249 | frag = ERR_PTR(ENOMEM); | |
250 | } | |
719269af | 251 | |
d4b2816d PB |
252 | return frag; |
253 | } | |
719269af | 254 | |
d4b2816d PB |
255 | static int |
256 | lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, | |
257 | u8 *frag_hdr, int frag_hdrlen, | |
258 | int offset, int len) | |
259 | { | |
260 | struct sk_buff *frag; | |
719269af | 261 | |
d4b2816d | 262 | raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen); |
719269af | 263 | |
d4b2816d PB |
264 | frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr); |
265 | if (IS_ERR(frag)) | |
266 | return -PTR_ERR(frag); | |
3582b900 | 267 | |
d4b2816d PB |
268 | memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen); |
269 | memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len); | |
719269af | 270 | |
d4b2816d | 271 | raw_dump_table(__func__, " fragment dump", frag->data, frag->len); |
719269af | 272 | |
545f3613 | 273 | return dev_queue_xmit(frag); |
719269af | 274 | } |
275 | ||
276 | static int | |
d4b2816d PB |
277 | lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev, |
278 | const struct ieee802154_hdr *wpan_hdr) | |
719269af | 279 | { |
d4b2816d PB |
280 | u16 dgram_size, dgram_offset; |
281 | __be16 frag_tag; | |
282 | u8 frag_hdr[5]; | |
283 | int frag_cap, frag_len, payload_cap, rc; | |
284 | int skb_unprocessed, skb_offset; | |
285 | ||
96cb3eb7 | 286 | dgram_size = lowpan_uncompress_size(skb, &dgram_offset) - |
d4b2816d PB |
287 | skb->mac_len; |
288 | frag_tag = lowpan_dev_info(dev)->fragment_tag++; | |
719269af | 289 | |
d4b2816d PB |
290 | frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07); |
291 | frag_hdr[1] = dgram_size & 0xff; | |
292 | memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag)); | |
719269af | 293 | |
d4b2816d | 294 | payload_cap = ieee802154_max_payload(wpan_hdr); |
d991b98f | 295 | |
d4b2816d PB |
296 | frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE - |
297 | skb_network_header_len(skb), 8); | |
719269af | 298 | |
d4b2816d PB |
299 | skb_offset = skb_network_header_len(skb); |
300 | skb_unprocessed = skb->len - skb->mac_len - skb_offset; | |
719269af | 301 | |
d4b2816d PB |
302 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, |
303 | LOWPAN_FRAG1_HEAD_SIZE, 0, | |
304 | frag_len + skb_network_header_len(skb)); | |
305 | if (rc) { | |
306 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
307 | __func__, frag_tag); | |
308 | goto err; | |
309 | } | |
96cb3eb7 | 310 | |
d4b2816d PB |
311 | frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1; |
312 | frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN; | |
313 | frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8); | |
719269af | 314 | |
51263fff | 315 | do { |
d4b2816d PB |
316 | dgram_offset += frag_len; |
317 | skb_offset += frag_len; | |
318 | skb_unprocessed -= frag_len; | |
319 | frag_len = min(frag_cap, skb_unprocessed); | |
719269af | 320 | |
d4b2816d | 321 | frag_hdr[4] = dgram_offset >> 3; |
719269af | 322 | |
d4b2816d PB |
323 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, |
324 | LOWPAN_FRAGN_HEAD_SIZE, skb_offset, | |
325 | frag_len); | |
326 | if (rc) { | |
d57fec84 | 327 | pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n", |
d4b2816d PB |
328 | __func__, frag_tag, skb_offset); |
329 | goto err; | |
9da2924c | 330 | } |
eb06481d | 331 | } while (skb_unprocessed > frag_cap); |
719269af | 332 | |
d4b2816d PB |
333 | consume_skb(skb); |
334 | return NET_XMIT_SUCCESS; | |
335 | ||
336 | err: | |
337 | kfree_skb(skb); | |
338 | return rc; | |
719269af | 339 | } |
340 | ||
44331fe2 AS |
341 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
342 | { | |
d4b2816d PB |
343 | struct ieee802154_hdr wpan_hdr; |
344 | int max_single; | |
44331fe2 | 345 | |
e71094f9 | 346 | pr_debug("package xmit\n"); |
44331fe2 | 347 | |
d4b2816d PB |
348 | if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) { |
349 | kfree_skb(skb); | |
350 | return NET_XMIT_DROP; | |
719269af | 351 | } |
352 | ||
d4b2816d | 353 | max_single = ieee802154_max_payload(&wpan_hdr); |
719269af | 354 | |
d4b2816d PB |
355 | if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) { |
356 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
357 | return dev_queue_xmit(skb); | |
358 | } else { | |
359 | netdev_tx_t rc; | |
44331fe2 | 360 | |
d4b2816d PB |
361 | pr_debug("frame is too big, fragmentation is needed\n"); |
362 | rc = lowpan_xmit_fragmented(skb, dev, &wpan_hdr); | |
363 | ||
364 | return rc < 0 ? NET_XMIT_DROP : rc; | |
365 | } | |
44331fe2 AS |
366 | } |
367 | ||
0848e404 | 368 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
369 | { | |
370 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
371 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); | |
372 | } | |
373 | ||
b70ab2e8 | 374 | static __le16 lowpan_get_pan_id(const struct net_device *dev) |
0848e404 | 375 | { |
376 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
377 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); | |
378 | } | |
379 | ||
b70ab2e8 | 380 | static __le16 lowpan_get_short_addr(const struct net_device *dev) |
0848e404 | 381 | { |
382 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
383 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); | |
384 | } | |
385 | ||
c7d0ab28 TC |
386 | static u8 lowpan_get_dsn(const struct net_device *dev) |
387 | { | |
388 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
389 | return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev); | |
390 | } | |
391 | ||
44331fe2 AS |
392 | static struct header_ops lowpan_header_ops = { |
393 | .create = lowpan_header_create, | |
394 | }; | |
395 | ||
20e7c4e8 ED |
396 | static struct lock_class_key lowpan_tx_busylock; |
397 | static struct lock_class_key lowpan_netdev_xmit_lock_key; | |
398 | ||
399 | static void lowpan_set_lockdep_class_one(struct net_device *dev, | |
400 | struct netdev_queue *txq, | |
401 | void *_unused) | |
402 | { | |
403 | lockdep_set_class(&txq->_xmit_lock, | |
404 | &lowpan_netdev_xmit_lock_key); | |
405 | } | |
406 | ||
407 | ||
408 | static int lowpan_dev_init(struct net_device *dev) | |
409 | { | |
410 | netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL); | |
411 | dev->qdisc_tx_busylock = &lowpan_tx_busylock; | |
412 | return 0; | |
413 | } | |
414 | ||
44331fe2 | 415 | static const struct net_device_ops lowpan_netdev_ops = { |
20e7c4e8 | 416 | .ndo_init = lowpan_dev_init, |
44331fe2 | 417 | .ndo_start_xmit = lowpan_xmit, |
42c36295 | 418 | .ndo_set_mac_address = lowpan_set_address, |
44331fe2 AS |
419 | }; |
420 | ||
0848e404 | 421 | static struct ieee802154_mlme_ops lowpan_mlme = { |
422 | .get_pan_id = lowpan_get_pan_id, | |
423 | .get_phy = lowpan_get_phy, | |
424 | .get_short_addr = lowpan_get_short_addr, | |
c7d0ab28 | 425 | .get_dsn = lowpan_get_dsn, |
0848e404 | 426 | }; |
427 | ||
44331fe2 AS |
428 | static void lowpan_setup(struct net_device *dev) |
429 | { | |
44331fe2 AS |
430 | dev->addr_len = IEEE802154_ADDR_LEN; |
431 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
432 | dev->type = ARPHRD_IEEE802154; | |
44331fe2 AS |
433 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
434 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
435 | dev->needed_tailroom = 2; /* FCS */ | |
436 | dev->mtu = 1281; | |
437 | dev->tx_queue_len = 0; | |
4d039f68 | 438 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
44331fe2 AS |
439 | dev->watchdog_timeo = 0; |
440 | ||
441 | dev->netdev_ops = &lowpan_netdev_ops; | |
442 | dev->header_ops = &lowpan_header_ops; | |
0848e404 | 443 | dev->ml_priv = &lowpan_mlme; |
a2dc375e | 444 | dev->destructor = free_netdev; |
44331fe2 AS |
445 | } |
446 | ||
447 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
448 | { | |
44331fe2 AS |
449 | if (tb[IFLA_ADDRESS]) { |
450 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
451 | return -EINVAL; | |
452 | } | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
457 | struct packet_type *pt, struct net_device *orig_dev) | |
458 | { | |
ae531b94 | 459 | struct ieee802154_hdr hdr; |
7240cdec | 460 | int ret; |
a437d274 | 461 | |
8cfad496 PB |
462 | skb = skb_share_check(skb, GFP_ATOMIC); |
463 | if (!skb) | |
464 | goto drop; | |
465 | ||
44331fe2 | 466 | if (!netif_running(dev)) |
7240cdec | 467 | goto drop_skb; |
44331fe2 AS |
468 | |
469 | if (dev->type != ARPHRD_IEEE802154) | |
7240cdec AA |
470 | goto drop_skb; |
471 | ||
ae531b94 PB |
472 | if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) |
473 | goto drop_skb; | |
474 | ||
44331fe2 | 475 | /* check that it's our buffer */ |
ee21c7e0 | 476 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { |
8cfad496 PB |
477 | skb->protocol = htons(ETH_P_IPV6); |
478 | skb->pkt_type = PACKET_HOST; | |
ee21c7e0 AO |
479 | |
480 | /* Pull off the 1-byte of 6lowpan header. */ | |
8cfad496 | 481 | skb_pull(skb, 1); |
ee21c7e0 | 482 | |
8cfad496 | 483 | ret = lowpan_give_skb_to_devices(skb, NULL); |
7240cdec AA |
484 | if (ret == NET_RX_DROP) |
485 | goto drop; | |
ee21c7e0 AO |
486 | } else { |
487 | switch (skb->data[0] & 0xe0) { | |
488 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
8cfad496 | 489 | ret = process_data(skb, &hdr); |
7240cdec AA |
490 | if (ret == NET_RX_DROP) |
491 | goto drop; | |
492 | break; | |
ee21c7e0 | 493 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ |
8cfad496 | 494 | ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1); |
7240cdec | 495 | if (ret == 1) { |
8cfad496 | 496 | ret = process_data(skb, &hdr); |
7240cdec AA |
497 | if (ret == NET_RX_DROP) |
498 | goto drop; | |
499 | } | |
500 | break; | |
ee21c7e0 | 501 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ |
8cfad496 | 502 | ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN); |
7240cdec | 503 | if (ret == 1) { |
8cfad496 | 504 | ret = process_data(skb, &hdr); |
7240cdec AA |
505 | if (ret == NET_RX_DROP) |
506 | goto drop; | |
507 | } | |
ee21c7e0 AO |
508 | break; |
509 | default: | |
510 | break; | |
511 | } | |
719269af | 512 | } |
44331fe2 AS |
513 | |
514 | return NET_RX_SUCCESS; | |
7240cdec | 515 | drop_skb: |
44331fe2 | 516 | kfree_skb(skb); |
7240cdec | 517 | drop: |
44331fe2 AS |
518 | return NET_RX_DROP; |
519 | } | |
520 | ||
521 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
522 | struct nlattr *tb[], struct nlattr *data[]) | |
523 | { | |
524 | struct net_device *real_dev; | |
525 | struct lowpan_dev_record *entry; | |
526 | ||
e71094f9 | 527 | pr_debug("adding new link\n"); |
44331fe2 AS |
528 | |
529 | if (!tb[IFLA_LINK]) | |
530 | return -EINVAL; | |
531 | /* find and hold real wpan device */ | |
532 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
533 | if (!real_dev) | |
534 | return -ENODEV; | |
78032f9b DC |
535 | if (real_dev->type != ARPHRD_IEEE802154) { |
536 | dev_put(real_dev); | |
7adac1ec | 537 | return -EINVAL; |
78032f9b | 538 | } |
44331fe2 AS |
539 | |
540 | lowpan_dev_info(dev)->real_dev = real_dev; | |
541 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); | |
542 | ||
d57fec84 | 543 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
dc00fd44 DC |
544 | if (!entry) { |
545 | dev_put(real_dev); | |
546 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 547 | return -ENOMEM; |
dc00fd44 | 548 | } |
44331fe2 AS |
549 | |
550 | entry->ldev = dev; | |
551 | ||
ab2d95df AO |
552 | /* Set the lowpan harware address to the wpan hardware address. */ |
553 | memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN); | |
554 | ||
44331fe2 AS |
555 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
556 | INIT_LIST_HEAD(&entry->list); | |
557 | list_add_tail(&entry->list, &lowpan_devices); | |
558 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
559 | ||
560 | register_netdevice(dev); | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
565 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
566 | { | |
567 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
568 | struct net_device *real_dev = lowpan_dev->real_dev; | |
8deff4af | 569 | struct lowpan_dev_record *entry, *tmp; |
44331fe2 AS |
570 | |
571 | ASSERT_RTNL(); | |
572 | ||
573 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
aec9db35 | 574 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
575 | if (entry->ldev == dev) { |
576 | list_del(&entry->list); | |
577 | kfree(entry); | |
578 | } | |
aec9db35 | 579 | } |
44331fe2 AS |
580 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
581 | ||
582 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
583 | ||
584 | unregister_netdevice_queue(dev, head); | |
585 | ||
586 | dev_put(real_dev); | |
587 | } | |
588 | ||
589 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
590 | .kind = "lowpan", | |
591 | .priv_size = sizeof(struct lowpan_dev_info), | |
592 | .setup = lowpan_setup, | |
593 | .newlink = lowpan_newlink, | |
594 | .dellink = lowpan_dellink, | |
595 | .validate = lowpan_validate, | |
596 | }; | |
597 | ||
598 | static inline int __init lowpan_netlink_init(void) | |
599 | { | |
600 | return rtnl_link_register(&lowpan_link_ops); | |
601 | } | |
602 | ||
a07fdcec | 603 | static inline void lowpan_netlink_fini(void) |
44331fe2 AS |
604 | { |
605 | rtnl_link_unregister(&lowpan_link_ops); | |
606 | } | |
607 | ||
a2dc375e | 608 | static int lowpan_device_event(struct notifier_block *unused, |
351638e7 | 609 | unsigned long event, void *ptr) |
a2dc375e | 610 | { |
351638e7 | 611 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
a2dc375e AO |
612 | LIST_HEAD(del_list); |
613 | struct lowpan_dev_record *entry, *tmp; | |
614 | ||
615 | if (dev->type != ARPHRD_IEEE802154) | |
616 | goto out; | |
617 | ||
618 | if (event == NETDEV_UNREGISTER) { | |
619 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { | |
620 | if (lowpan_dev_info(entry->ldev)->real_dev == dev) | |
621 | lowpan_dellink(entry->ldev, &del_list); | |
622 | } | |
623 | ||
624 | unregister_netdevice_many(&del_list); | |
4c835019 | 625 | } |
a2dc375e AO |
626 | |
627 | out: | |
628 | return NOTIFY_DONE; | |
629 | } | |
630 | ||
631 | static struct notifier_block lowpan_dev_notifier = { | |
632 | .notifier_call = lowpan_device_event, | |
633 | }; | |
634 | ||
44331fe2 | 635 | static struct packet_type lowpan_packet_type = { |
ec633eb5 | 636 | .type = htons(ETH_P_IEEE802154), |
44331fe2 AS |
637 | .func = lowpan_rcv, |
638 | }; | |
639 | ||
640 | static int __init lowpan_init_module(void) | |
641 | { | |
642 | int err = 0; | |
643 | ||
7240cdec | 644 | err = lowpan_net_frag_init(); |
44331fe2 AS |
645 | if (err < 0) |
646 | goto out; | |
647 | ||
7240cdec AA |
648 | err = lowpan_netlink_init(); |
649 | if (err < 0) | |
650 | goto out_frag; | |
651 | ||
44331fe2 | 652 | dev_add_pack(&lowpan_packet_type); |
a2dc375e AO |
653 | |
654 | err = register_netdevice_notifier(&lowpan_dev_notifier); | |
7240cdec AA |
655 | if (err < 0) |
656 | goto out_pack; | |
657 | ||
658 | return 0; | |
659 | ||
660 | out_pack: | |
661 | dev_remove_pack(&lowpan_packet_type); | |
662 | lowpan_netlink_fini(); | |
663 | out_frag: | |
664 | lowpan_net_frag_exit(); | |
44331fe2 AS |
665 | out: |
666 | return err; | |
667 | } | |
668 | ||
669 | static void __exit lowpan_cleanup_module(void) | |
670 | { | |
44331fe2 AS |
671 | lowpan_netlink_fini(); |
672 | ||
673 | dev_remove_pack(&lowpan_packet_type); | |
33c34c5e | 674 | |
7240cdec | 675 | lowpan_net_frag_exit(); |
a2dc375e | 676 | |
7240cdec | 677 | unregister_netdevice_notifier(&lowpan_dev_notifier); |
44331fe2 AS |
678 | } |
679 | ||
680 | module_init(lowpan_init_module); | |
681 | module_exit(lowpan_cleanup_module); | |
682 | MODULE_LICENSE("GPL"); | |
683 | MODULE_ALIAS_RTNL_LINK("lowpan"); |