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 | ||
f19f4f95 SV |
74 | /* don't save pan id, it's intra pan */ |
75 | struct lowpan_addr { | |
76 | u8 mode; | |
77 | union { | |
78 | /* IPv6 needs big endian here */ | |
79 | __be64 extended_addr; | |
80 | __be16 short_addr; | |
81 | } u; | |
82 | }; | |
83 | ||
84 | struct lowpan_addr_info { | |
85 | struct lowpan_addr daddr; | |
86 | struct lowpan_addr saddr; | |
87 | }; | |
88 | ||
44331fe2 AS |
89 | static inline struct |
90 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
91 | { | |
92 | return netdev_priv(dev); | |
93 | } | |
94 | ||
f19f4f95 SV |
95 | static inline struct |
96 | lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb) | |
97 | { | |
98 | WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info)); | |
99 | return (struct lowpan_addr_info *)(skb->data - | |
100 | sizeof(struct lowpan_addr_info)); | |
101 | } | |
102 | ||
4710d806 VB |
103 | static int lowpan_header_create(struct sk_buff *skb, struct net_device *dev, |
104 | unsigned short type, const void *_daddr, | |
105 | const void *_saddr, unsigned int len) | |
44331fe2 | 106 | { |
44331fe2 AS |
107 | const u8 *saddr = _saddr; |
108 | const u8 *daddr = _daddr; | |
f19f4f95 | 109 | struct lowpan_addr_info *info; |
44331fe2 | 110 | |
fc4e98db AA |
111 | /* TODO: |
112 | * if this package isn't ipv6 one, where should it be routed? | |
113 | */ | |
44331fe2 AS |
114 | if (type != ETH_P_IPV6) |
115 | return 0; | |
44331fe2 | 116 | |
44331fe2 AS |
117 | if (!saddr) |
118 | saddr = dev->dev_addr; | |
119 | ||
841a5ec7 AA |
120 | raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); |
121 | raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
44331fe2 | 122 | |
f19f4f95 | 123 | info = lowpan_skb_priv(skb); |
8df8c56a | 124 | |
f19f4f95 SV |
125 | /* TODO: Currently we only support extended_addr */ |
126 | info->daddr.mode = IEEE802154_ADDR_LONG; | |
127 | memcpy(&info->daddr.u.extended_addr, daddr, | |
128 | sizeof(info->daddr.u.extended_addr)); | |
129 | info->saddr.mode = IEEE802154_ADDR_LONG; | |
130 | memcpy(&info->saddr.u.extended_addr, saddr, | |
131 | sizeof(info->daddr.u.extended_addr)); | |
32edc40a | 132 | |
f19f4f95 | 133 | return 0; |
44331fe2 AS |
134 | } |
135 | ||
8df8c56a | 136 | static int lowpan_give_skb_to_devices(struct sk_buff *skb, |
4710d806 | 137 | struct net_device *dev) |
0c446212 AO |
138 | { |
139 | struct lowpan_dev_record *entry; | |
140 | struct sk_buff *skb_cp; | |
141 | int stat = NET_RX_SUCCESS; | |
142 | ||
143 | rcu_read_lock(); | |
144 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
145 | if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) { | |
146 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
147 | if (!skb_cp) { | |
148 | stat = -ENOMEM; | |
149 | break; | |
150 | } | |
151 | ||
152 | skb_cp->dev = entry->ldev; | |
153 | stat = netif_rx(skb_cp); | |
154 | } | |
155 | rcu_read_unlock(); | |
156 | ||
157 | return stat; | |
158 | } | |
159 | ||
ae531b94 | 160 | static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr) |
44331fe2 | 161 | { |
8df8c56a | 162 | u8 iphc0, iphc1; |
ae531b94 PB |
163 | struct ieee802154_addr_sa sa, da; |
164 | void *sap, *dap; | |
44331fe2 | 165 | |
841a5ec7 | 166 | raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len); |
44331fe2 AS |
167 | /* at least two bytes will be used for the encoding */ |
168 | if (skb->len < 2) | |
169 | goto drop; | |
c5d3687f | 170 | |
171 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
172 | goto drop; | |
719269af | 173 | |
c5d3687f | 174 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
175 | goto drop; | |
44331fe2 | 176 | |
ae531b94 PB |
177 | ieee802154_addr_to_sa(&sa, &hdr->source); |
178 | ieee802154_addr_to_sa(&da, &hdr->dest); | |
44331fe2 | 179 | |
ae531b94 PB |
180 | if (sa.addr_type == IEEE802154_ADDR_SHORT) |
181 | sap = &sa.short_addr; | |
182 | else | |
183 | sap = &sa.hwaddr; | |
184 | ||
185 | if (da.addr_type == IEEE802154_ADDR_SHORT) | |
186 | dap = &da.short_addr; | |
187 | else | |
188 | dap = &da.hwaddr; | |
189 | ||
190 | return lowpan_process_data(skb, skb->dev, sap, sa.addr_type, | |
191 | IEEE802154_ADDR_LEN, dap, da.addr_type, | |
192 | IEEE802154_ADDR_LEN, iphc0, iphc1, | |
193 | lowpan_give_skb_to_devices); | |
719269af | 194 | |
44331fe2 | 195 | drop: |
90d0963d | 196 | kfree_skb(skb); |
44331fe2 AS |
197 | return -EINVAL; |
198 | } | |
199 | ||
42c36295 | 200 | static int lowpan_set_address(struct net_device *dev, void *p) |
201 | { | |
202 | struct sockaddr *sa = p; | |
203 | ||
204 | if (netif_running(dev)) | |
205 | return -EBUSY; | |
206 | ||
207 | /* TODO: validate addr */ | |
208 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
d4b2816d PB |
213 | static struct sk_buff* |
214 | lowpan_alloc_frag(struct sk_buff *skb, int size, | |
215 | const struct ieee802154_hdr *master_hdr) | |
719269af | 216 | { |
d4b2816d | 217 | struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev; |
719269af | 218 | struct sk_buff *frag; |
d4b2816d PB |
219 | int rc; |
220 | ||
221 | frag = alloc_skb(real_dev->hard_header_len + | |
222 | real_dev->needed_tailroom + size, | |
223 | GFP_ATOMIC); | |
224 | ||
225 | if (likely(frag)) { | |
226 | frag->dev = real_dev; | |
227 | frag->priority = skb->priority; | |
228 | skb_reserve(frag, real_dev->hard_header_len); | |
229 | skb_reset_network_header(frag); | |
230 | *mac_cb(frag) = *mac_cb(skb); | |
231 | ||
232 | rc = dev_hard_header(frag, real_dev, 0, &master_hdr->dest, | |
233 | &master_hdr->source, size); | |
234 | if (rc < 0) { | |
235 | kfree_skb(frag); | |
236 | return ERR_PTR(-rc); | |
237 | } | |
238 | } else { | |
c4cb901a | 239 | frag = ERR_PTR(-ENOMEM); |
d4b2816d | 240 | } |
719269af | 241 | |
d4b2816d PB |
242 | return frag; |
243 | } | |
719269af | 244 | |
d4b2816d PB |
245 | static int |
246 | lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, | |
247 | u8 *frag_hdr, int frag_hdrlen, | |
248 | int offset, int len) | |
249 | { | |
250 | struct sk_buff *frag; | |
719269af | 251 | |
d4b2816d | 252 | raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen); |
719269af | 253 | |
d4b2816d PB |
254 | frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr); |
255 | if (IS_ERR(frag)) | |
256 | return -PTR_ERR(frag); | |
3582b900 | 257 | |
d4b2816d PB |
258 | memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen); |
259 | memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len); | |
719269af | 260 | |
d4b2816d | 261 | raw_dump_table(__func__, " fragment dump", frag->data, frag->len); |
719269af | 262 | |
545f3613 | 263 | return dev_queue_xmit(frag); |
719269af | 264 | } |
265 | ||
266 | static int | |
d4b2816d PB |
267 | lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev, |
268 | const struct ieee802154_hdr *wpan_hdr) | |
719269af | 269 | { |
d4b2816d PB |
270 | u16 dgram_size, dgram_offset; |
271 | __be16 frag_tag; | |
272 | u8 frag_hdr[5]; | |
273 | int frag_cap, frag_len, payload_cap, rc; | |
274 | int skb_unprocessed, skb_offset; | |
275 | ||
96cb3eb7 | 276 | dgram_size = lowpan_uncompress_size(skb, &dgram_offset) - |
d4b2816d PB |
277 | skb->mac_len; |
278 | frag_tag = lowpan_dev_info(dev)->fragment_tag++; | |
719269af | 279 | |
d4b2816d PB |
280 | frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07); |
281 | frag_hdr[1] = dgram_size & 0xff; | |
282 | memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag)); | |
719269af | 283 | |
d4b2816d | 284 | payload_cap = ieee802154_max_payload(wpan_hdr); |
d991b98f | 285 | |
d4b2816d PB |
286 | frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE - |
287 | skb_network_header_len(skb), 8); | |
719269af | 288 | |
d4b2816d PB |
289 | skb_offset = skb_network_header_len(skb); |
290 | skb_unprocessed = skb->len - skb->mac_len - skb_offset; | |
719269af | 291 | |
d4b2816d PB |
292 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, |
293 | LOWPAN_FRAG1_HEAD_SIZE, 0, | |
294 | frag_len + skb_network_header_len(skb)); | |
295 | if (rc) { | |
296 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
297 | __func__, frag_tag); | |
298 | goto err; | |
299 | } | |
96cb3eb7 | 300 | |
d4b2816d PB |
301 | frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1; |
302 | frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN; | |
303 | frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8); | |
719269af | 304 | |
51263fff | 305 | do { |
d4b2816d PB |
306 | dgram_offset += frag_len; |
307 | skb_offset += frag_len; | |
308 | skb_unprocessed -= frag_len; | |
309 | frag_len = min(frag_cap, skb_unprocessed); | |
719269af | 310 | |
d4b2816d | 311 | frag_hdr[4] = dgram_offset >> 3; |
719269af | 312 | |
d4b2816d PB |
313 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, |
314 | LOWPAN_FRAGN_HEAD_SIZE, skb_offset, | |
315 | frag_len); | |
316 | if (rc) { | |
d57fec84 | 317 | pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n", |
d4b2816d PB |
318 | __func__, frag_tag, skb_offset); |
319 | goto err; | |
9da2924c | 320 | } |
eb06481d | 321 | } while (skb_unprocessed > frag_cap); |
719269af | 322 | |
d4b2816d PB |
323 | consume_skb(skb); |
324 | return NET_XMIT_SUCCESS; | |
325 | ||
326 | err: | |
327 | kfree_skb(skb); | |
328 | return rc; | |
719269af | 329 | } |
330 | ||
f19f4f95 SV |
331 | static int lowpan_header(struct sk_buff *skb, struct net_device *dev) |
332 | { | |
333 | struct ieee802154_addr sa, da; | |
334 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); | |
335 | struct lowpan_addr_info info; | |
336 | void *daddr, *saddr; | |
337 | ||
338 | memcpy(&info, lowpan_skb_priv(skb), sizeof(info)); | |
339 | ||
340 | /* TODO: Currently we only support extended_addr */ | |
341 | daddr = &info.daddr.u.extended_addr; | |
342 | saddr = &info.saddr.u.extended_addr; | |
343 | ||
344 | lowpan_header_compress(skb, dev, ETH_P_IPV6, daddr, saddr, skb->len); | |
345 | ||
346 | cb->type = IEEE802154_FC_TYPE_DATA; | |
347 | ||
348 | /* prepare wpan address data */ | |
349 | sa.mode = IEEE802154_ADDR_LONG; | |
350 | sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); | |
351 | sa.extended_addr = ieee802154_devaddr_from_raw(saddr); | |
352 | ||
353 | /* intra-PAN communications */ | |
354 | da.pan_id = sa.pan_id; | |
355 | ||
356 | /* if the destination address is the broadcast address, use the | |
357 | * corresponding short address | |
358 | */ | |
359 | if (lowpan_is_addr_broadcast((const u8 *)daddr)) { | |
360 | da.mode = IEEE802154_ADDR_SHORT; | |
361 | da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); | |
362 | cb->ackreq = false; | |
363 | } else { | |
364 | da.mode = IEEE802154_ADDR_LONG; | |
365 | da.extended_addr = ieee802154_devaddr_from_raw(daddr); | |
366 | cb->ackreq = true; | |
367 | } | |
368 | ||
369 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, | |
370 | ETH_P_IPV6, (void *)&da, (void *)&sa, 0); | |
371 | } | |
372 | ||
44331fe2 AS |
373 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
374 | { | |
d4b2816d | 375 | struct ieee802154_hdr wpan_hdr; |
f19f4f95 | 376 | int max_single, ret; |
44331fe2 | 377 | |
e71094f9 | 378 | pr_debug("package xmit\n"); |
44331fe2 | 379 | |
f19f4f95 SV |
380 | /* We must take a copy of the skb before we modify/replace the ipv6 |
381 | * header as the header could be used elsewhere | |
382 | */ | |
383 | skb = skb_unshare(skb, GFP_ATOMIC); | |
384 | if (!skb) | |
385 | return NET_XMIT_DROP; | |
386 | ||
387 | ret = lowpan_header(skb, dev); | |
388 | if (ret < 0) { | |
389 | kfree_skb(skb); | |
390 | return NET_XMIT_DROP; | |
391 | } | |
392 | ||
d4b2816d PB |
393 | if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) { |
394 | kfree_skb(skb); | |
395 | return NET_XMIT_DROP; | |
719269af | 396 | } |
397 | ||
d4b2816d | 398 | max_single = ieee802154_max_payload(&wpan_hdr); |
719269af | 399 | |
d4b2816d PB |
400 | if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) { |
401 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
402 | return dev_queue_xmit(skb); | |
403 | } else { | |
404 | netdev_tx_t rc; | |
44331fe2 | 405 | |
d4b2816d PB |
406 | pr_debug("frame is too big, fragmentation is needed\n"); |
407 | rc = lowpan_xmit_fragmented(skb, dev, &wpan_hdr); | |
408 | ||
409 | return rc < 0 ? NET_XMIT_DROP : rc; | |
410 | } | |
44331fe2 AS |
411 | } |
412 | ||
0848e404 | 413 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
414 | { | |
415 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
4710d806 | 416 | |
0848e404 | 417 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); |
418 | } | |
419 | ||
b70ab2e8 | 420 | static __le16 lowpan_get_pan_id(const struct net_device *dev) |
0848e404 | 421 | { |
422 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
4710d806 | 423 | |
0848e404 | 424 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); |
425 | } | |
426 | ||
b70ab2e8 | 427 | static __le16 lowpan_get_short_addr(const struct net_device *dev) |
0848e404 | 428 | { |
429 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
4710d806 | 430 | |
0848e404 | 431 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); |
432 | } | |
433 | ||
c7d0ab28 TC |
434 | static u8 lowpan_get_dsn(const struct net_device *dev) |
435 | { | |
436 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
4710d806 | 437 | |
c7d0ab28 TC |
438 | return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev); |
439 | } | |
440 | ||
44331fe2 AS |
441 | static struct header_ops lowpan_header_ops = { |
442 | .create = lowpan_header_create, | |
443 | }; | |
444 | ||
20e7c4e8 ED |
445 | static struct lock_class_key lowpan_tx_busylock; |
446 | static struct lock_class_key lowpan_netdev_xmit_lock_key; | |
447 | ||
448 | static void lowpan_set_lockdep_class_one(struct net_device *dev, | |
449 | struct netdev_queue *txq, | |
450 | void *_unused) | |
451 | { | |
452 | lockdep_set_class(&txq->_xmit_lock, | |
453 | &lowpan_netdev_xmit_lock_key); | |
454 | } | |
455 | ||
456 | ||
457 | static int lowpan_dev_init(struct net_device *dev) | |
458 | { | |
459 | netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL); | |
460 | dev->qdisc_tx_busylock = &lowpan_tx_busylock; | |
461 | return 0; | |
462 | } | |
463 | ||
44331fe2 | 464 | static const struct net_device_ops lowpan_netdev_ops = { |
20e7c4e8 | 465 | .ndo_init = lowpan_dev_init, |
44331fe2 | 466 | .ndo_start_xmit = lowpan_xmit, |
42c36295 | 467 | .ndo_set_mac_address = lowpan_set_address, |
44331fe2 AS |
468 | }; |
469 | ||
0848e404 | 470 | static struct ieee802154_mlme_ops lowpan_mlme = { |
471 | .get_pan_id = lowpan_get_pan_id, | |
472 | .get_phy = lowpan_get_phy, | |
473 | .get_short_addr = lowpan_get_short_addr, | |
c7d0ab28 | 474 | .get_dsn = lowpan_get_dsn, |
0848e404 | 475 | }; |
476 | ||
44331fe2 AS |
477 | static void lowpan_setup(struct net_device *dev) |
478 | { | |
44331fe2 AS |
479 | dev->addr_len = IEEE802154_ADDR_LEN; |
480 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
481 | dev->type = ARPHRD_IEEE802154; | |
44331fe2 AS |
482 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
483 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
484 | dev->needed_tailroom = 2; /* FCS */ | |
685d6328 | 485 | dev->mtu = IPV6_MIN_MTU; |
44331fe2 | 486 | dev->tx_queue_len = 0; |
4d039f68 | 487 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
44331fe2 AS |
488 | dev->watchdog_timeo = 0; |
489 | ||
490 | dev->netdev_ops = &lowpan_netdev_ops; | |
491 | dev->header_ops = &lowpan_header_ops; | |
0848e404 | 492 | dev->ml_priv = &lowpan_mlme; |
a2dc375e | 493 | dev->destructor = free_netdev; |
44331fe2 AS |
494 | } |
495 | ||
496 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
497 | { | |
44331fe2 AS |
498 | if (tb[IFLA_ADDRESS]) { |
499 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
500 | return -EINVAL; | |
501 | } | |
502 | return 0; | |
503 | } | |
504 | ||
505 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
4710d806 | 506 | struct packet_type *pt, struct net_device *orig_dev) |
44331fe2 | 507 | { |
ae531b94 | 508 | struct ieee802154_hdr hdr; |
7240cdec | 509 | int ret; |
a437d274 | 510 | |
8cfad496 PB |
511 | skb = skb_share_check(skb, GFP_ATOMIC); |
512 | if (!skb) | |
513 | goto drop; | |
514 | ||
44331fe2 | 515 | if (!netif_running(dev)) |
7240cdec | 516 | goto drop_skb; |
44331fe2 AS |
517 | |
518 | if (dev->type != ARPHRD_IEEE802154) | |
7240cdec AA |
519 | goto drop_skb; |
520 | ||
ae531b94 PB |
521 | if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) |
522 | goto drop_skb; | |
523 | ||
44331fe2 | 524 | /* check that it's our buffer */ |
ee21c7e0 | 525 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { |
8cfad496 PB |
526 | skb->protocol = htons(ETH_P_IPV6); |
527 | skb->pkt_type = PACKET_HOST; | |
ee21c7e0 AO |
528 | |
529 | /* Pull off the 1-byte of 6lowpan header. */ | |
8cfad496 | 530 | skb_pull(skb, 1); |
ee21c7e0 | 531 | |
8cfad496 | 532 | ret = lowpan_give_skb_to_devices(skb, NULL); |
7240cdec AA |
533 | if (ret == NET_RX_DROP) |
534 | goto drop; | |
ee21c7e0 AO |
535 | } else { |
536 | switch (skb->data[0] & 0xe0) { | |
537 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
8cfad496 | 538 | ret = process_data(skb, &hdr); |
7240cdec AA |
539 | if (ret == NET_RX_DROP) |
540 | goto drop; | |
541 | break; | |
ee21c7e0 | 542 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ |
8cfad496 | 543 | ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1); |
7240cdec | 544 | if (ret == 1) { |
8cfad496 | 545 | ret = process_data(skb, &hdr); |
7240cdec AA |
546 | if (ret == NET_RX_DROP) |
547 | goto drop; | |
548 | } | |
549 | break; | |
ee21c7e0 | 550 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ |
8cfad496 | 551 | ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN); |
7240cdec | 552 | if (ret == 1) { |
8cfad496 | 553 | ret = process_data(skb, &hdr); |
7240cdec AA |
554 | if (ret == NET_RX_DROP) |
555 | goto drop; | |
556 | } | |
ee21c7e0 AO |
557 | break; |
558 | default: | |
559 | break; | |
560 | } | |
719269af | 561 | } |
44331fe2 AS |
562 | |
563 | return NET_RX_SUCCESS; | |
7240cdec | 564 | drop_skb: |
44331fe2 | 565 | kfree_skb(skb); |
7240cdec | 566 | drop: |
44331fe2 AS |
567 | return NET_RX_DROP; |
568 | } | |
569 | ||
570 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
571 | struct nlattr *tb[], struct nlattr *data[]) | |
572 | { | |
573 | struct net_device *real_dev; | |
574 | struct lowpan_dev_record *entry; | |
575 | ||
e71094f9 | 576 | pr_debug("adding new link\n"); |
44331fe2 AS |
577 | |
578 | if (!tb[IFLA_LINK]) | |
579 | return -EINVAL; | |
580 | /* find and hold real wpan device */ | |
581 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
582 | if (!real_dev) | |
583 | return -ENODEV; | |
78032f9b DC |
584 | if (real_dev->type != ARPHRD_IEEE802154) { |
585 | dev_put(real_dev); | |
7adac1ec | 586 | return -EINVAL; |
78032f9b | 587 | } |
44331fe2 AS |
588 | |
589 | lowpan_dev_info(dev)->real_dev = real_dev; | |
590 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); | |
591 | ||
d57fec84 | 592 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
dc00fd44 DC |
593 | if (!entry) { |
594 | dev_put(real_dev); | |
595 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 596 | return -ENOMEM; |
dc00fd44 | 597 | } |
44331fe2 AS |
598 | |
599 | entry->ldev = dev; | |
600 | ||
ab2d95df AO |
601 | /* Set the lowpan harware address to the wpan hardware address. */ |
602 | memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN); | |
603 | ||
44331fe2 AS |
604 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
605 | INIT_LIST_HEAD(&entry->list); | |
606 | list_add_tail(&entry->list, &lowpan_devices); | |
607 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
608 | ||
609 | register_netdevice(dev); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
615 | { | |
616 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
617 | struct net_device *real_dev = lowpan_dev->real_dev; | |
8deff4af | 618 | struct lowpan_dev_record *entry, *tmp; |
44331fe2 AS |
619 | |
620 | ASSERT_RTNL(); | |
621 | ||
622 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
aec9db35 | 623 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
624 | if (entry->ldev == dev) { |
625 | list_del(&entry->list); | |
626 | kfree(entry); | |
627 | } | |
aec9db35 | 628 | } |
44331fe2 AS |
629 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
630 | ||
631 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
632 | ||
633 | unregister_netdevice_queue(dev, head); | |
634 | ||
635 | dev_put(real_dev); | |
636 | } | |
637 | ||
638 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
639 | .kind = "lowpan", | |
640 | .priv_size = sizeof(struct lowpan_dev_info), | |
641 | .setup = lowpan_setup, | |
642 | .newlink = lowpan_newlink, | |
643 | .dellink = lowpan_dellink, | |
644 | .validate = lowpan_validate, | |
645 | }; | |
646 | ||
647 | static inline int __init lowpan_netlink_init(void) | |
648 | { | |
649 | return rtnl_link_register(&lowpan_link_ops); | |
650 | } | |
651 | ||
a07fdcec | 652 | static inline void lowpan_netlink_fini(void) |
44331fe2 AS |
653 | { |
654 | rtnl_link_unregister(&lowpan_link_ops); | |
655 | } | |
656 | ||
a2dc375e | 657 | static int lowpan_device_event(struct notifier_block *unused, |
351638e7 | 658 | unsigned long event, void *ptr) |
a2dc375e | 659 | { |
351638e7 | 660 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
a2dc375e AO |
661 | LIST_HEAD(del_list); |
662 | struct lowpan_dev_record *entry, *tmp; | |
663 | ||
664 | if (dev->type != ARPHRD_IEEE802154) | |
665 | goto out; | |
666 | ||
667 | if (event == NETDEV_UNREGISTER) { | |
668 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { | |
669 | if (lowpan_dev_info(entry->ldev)->real_dev == dev) | |
670 | lowpan_dellink(entry->ldev, &del_list); | |
671 | } | |
672 | ||
673 | unregister_netdevice_many(&del_list); | |
4c835019 | 674 | } |
a2dc375e AO |
675 | |
676 | out: | |
677 | return NOTIFY_DONE; | |
678 | } | |
679 | ||
680 | static struct notifier_block lowpan_dev_notifier = { | |
681 | .notifier_call = lowpan_device_event, | |
682 | }; | |
683 | ||
44331fe2 | 684 | static struct packet_type lowpan_packet_type = { |
ec633eb5 | 685 | .type = htons(ETH_P_IEEE802154), |
44331fe2 AS |
686 | .func = lowpan_rcv, |
687 | }; | |
688 | ||
689 | static int __init lowpan_init_module(void) | |
690 | { | |
691 | int err = 0; | |
692 | ||
7240cdec | 693 | err = lowpan_net_frag_init(); |
44331fe2 AS |
694 | if (err < 0) |
695 | goto out; | |
696 | ||
7240cdec AA |
697 | err = lowpan_netlink_init(); |
698 | if (err < 0) | |
699 | goto out_frag; | |
700 | ||
44331fe2 | 701 | dev_add_pack(&lowpan_packet_type); |
a2dc375e AO |
702 | |
703 | err = register_netdevice_notifier(&lowpan_dev_notifier); | |
7240cdec AA |
704 | if (err < 0) |
705 | goto out_pack; | |
706 | ||
707 | return 0; | |
708 | ||
709 | out_pack: | |
710 | dev_remove_pack(&lowpan_packet_type); | |
711 | lowpan_netlink_fini(); | |
712 | out_frag: | |
713 | lowpan_net_frag_exit(); | |
44331fe2 AS |
714 | out: |
715 | return err; | |
716 | } | |
717 | ||
718 | static void __exit lowpan_cleanup_module(void) | |
719 | { | |
44331fe2 AS |
720 | lowpan_netlink_fini(); |
721 | ||
722 | dev_remove_pack(&lowpan_packet_type); | |
33c34c5e | 723 | |
7240cdec | 724 | lowpan_net_frag_exit(); |
a2dc375e | 725 | |
7240cdec | 726 | unregister_netdevice_notifier(&lowpan_dev_notifier); |
44331fe2 AS |
727 | } |
728 | ||
729 | module_init(lowpan_init_module); | |
730 | module_exit(lowpan_cleanup_module); | |
731 | MODULE_LICENSE("GPL"); | |
732 | MODULE_ALIAS_RTNL_LINK("lowpan"); |