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44331fe2 AS |
1 | /* |
2 | * Copyright 2011, Siemens AG | |
3 | * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
4 | */ | |
5 | ||
6 | /* | |
7 | * Based on patches from Jon Smirl <jonsmirl@gmail.com> | |
8 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 | |
12 | * as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | */ | |
23 | ||
24 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
25 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
26 | * All rights reserved. | |
27 | * | |
28 | * Redistribution and use in source and binary forms, with or without | |
29 | * modification, are permitted provided that the following conditions | |
30 | * are met: | |
31 | * 1. Redistributions of source code must retain the above copyright | |
32 | * notice, this list of conditions and the following disclaimer. | |
33 | * 2. Redistributions in binary form must reproduce the above copyright | |
34 | * notice, this list of conditions and the following disclaimer in the | |
35 | * documentation and/or other materials provided with the distribution. | |
36 | * 3. Neither the name of the Institute nor the names of its contributors | |
37 | * may be used to endorse or promote products derived from this software | |
38 | * without specific prior written permission. | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
51 | */ | |
52 | ||
44331fe2 AS |
53 | #include <linux/bitops.h> |
54 | #include <linux/if_arp.h> | |
55 | #include <linux/module.h> | |
56 | #include <linux/moduleparam.h> | |
57 | #include <linux/netdevice.h> | |
58 | #include <net/af_ieee802154.h> | |
59 | #include <net/ieee802154.h> | |
60 | #include <net/ieee802154_netdev.h> | |
61 | #include <net/ipv6.h> | |
62 | ||
63 | #include "6lowpan.h" | |
64 | ||
65 | /* TTL uncompression values */ | |
66 | static const u8 lowpan_ttl_values[] = {0, 1, 64, 255}; | |
67 | ||
68 | static LIST_HEAD(lowpan_devices); | |
69 | ||
70 | /* | |
71 | * Uncompression of linklocal: | |
72 | * 0 -> 16 bytes from packet | |
73 | * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet | |
74 | * 2 -> 2 bytes from prefix - zeroes + 2 from packet | |
75 | * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr | |
76 | * | |
77 | * NOTE: => the uncompress function does change 0xf to 0x10 | |
78 | * NOTE: 0x00 => no-autoconfig => unspecified | |
79 | */ | |
80 | static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20}; | |
81 | ||
82 | /* | |
83 | * Uncompression of ctx-based: | |
84 | * 0 -> 0 bits from packet [unspecified / reserved] | |
85 | * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet | |
86 | * 2 -> 8 bytes from prefix - zeroes + 2 from packet | |
87 | * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr | |
88 | */ | |
89 | static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80}; | |
90 | ||
91 | /* | |
92 | * Uncompression of ctx-base | |
93 | * 0 -> 0 bits from packet | |
94 | * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet | |
95 | * 2 -> 2 bytes from prefix - zeroes + 3 from packet | |
96 | * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr | |
97 | */ | |
98 | static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21}; | |
99 | ||
100 | /* Link local prefix */ | |
101 | static const u8 lowpan_llprefix[] = {0xfe, 0x80}; | |
102 | ||
103 | /* private device info */ | |
104 | struct lowpan_dev_info { | |
105 | struct net_device *real_dev; /* real WPAN device ptr */ | |
106 | struct mutex dev_list_mtx; /* mutex for list ops */ | |
107 | }; | |
108 | ||
109 | struct lowpan_dev_record { | |
110 | struct net_device *ldev; | |
111 | struct list_head list; | |
112 | }; | |
113 | ||
719269af | 114 | struct lowpan_fragment { |
115 | struct sk_buff *skb; /* skb to be assembled */ | |
116 | spinlock_t lock; /* concurency lock */ | |
117 | u16 length; /* length to be assemled */ | |
118 | u32 bytes_rcv; /* bytes received */ | |
119 | u16 tag; /* current fragment tag */ | |
120 | struct timer_list timer; /* assembling timer */ | |
121 | struct list_head list; /* fragments list */ | |
122 | }; | |
123 | ||
124 | static unsigned short fragment_tag; | |
125 | static LIST_HEAD(lowpan_fragments); | |
126 | spinlock_t flist_lock; | |
127 | ||
44331fe2 AS |
128 | static inline struct |
129 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
130 | { | |
131 | return netdev_priv(dev); | |
132 | } | |
133 | ||
134 | static inline void lowpan_address_flip(u8 *src, u8 *dest) | |
135 | { | |
136 | int i; | |
137 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) | |
138 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; | |
139 | } | |
140 | ||
141 | /* list of all 6lowpan devices, uses for package delivering */ | |
142 | /* print data in line */ | |
143 | static inline void lowpan_raw_dump_inline(const char *caller, char *msg, | |
144 | unsigned char *buf, int len) | |
145 | { | |
146 | #ifdef DEBUG | |
147 | if (msg) | |
148 | pr_debug("(%s) %s: ", caller, msg); | |
149 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, | |
150 | 16, 1, buf, len, false); | |
151 | #endif /* DEBUG */ | |
152 | } | |
153 | ||
154 | /* | |
155 | * print data in a table format: | |
156 | * | |
157 | * addr: xx xx xx xx xx xx | |
158 | * addr: xx xx xx xx xx xx | |
159 | * ... | |
160 | */ | |
161 | static inline void lowpan_raw_dump_table(const char *caller, char *msg, | |
162 | unsigned char *buf, int len) | |
163 | { | |
164 | #ifdef DEBUG | |
165 | if (msg) | |
166 | pr_debug("(%s) %s:\n", caller, msg); | |
167 | print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, | |
168 | 16, 1, buf, len, false); | |
169 | #endif /* DEBUG */ | |
170 | } | |
171 | ||
172 | static u8 | |
173 | lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr, | |
174 | const unsigned char *lladdr) | |
175 | { | |
176 | u8 val = 0; | |
177 | ||
178 | if (is_addr_mac_addr_based(ipaddr, lladdr)) | |
179 | val = 3; /* 0-bits */ | |
180 | else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
181 | /* compress IID to 16 bits xxxx::XXXX */ | |
182 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); | |
183 | *hc06_ptr += 2; | |
184 | val = 2; /* 16-bits */ | |
185 | } else { | |
186 | /* do not compress IID => xxxx::IID */ | |
187 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); | |
188 | *hc06_ptr += 8; | |
189 | val = 1; /* 64-bits */ | |
190 | } | |
191 | ||
192 | return rol8(val, shift); | |
193 | } | |
194 | ||
195 | static void | |
196 | lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr) | |
197 | { | |
198 | memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ALEN); | |
199 | /* second bit-flip (Universe/Local) is done according RFC2464 */ | |
200 | ipaddr->s6_addr[8] ^= 0x02; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Uncompress addresses based on a prefix and a postfix with zeroes in | |
205 | * between. If the postfix is zero in length it will use the link address | |
206 | * to configure the IP address (autoconf style). | |
207 | * pref_post_count takes a byte where the first nibble specify prefix count | |
208 | * and the second postfix count (NOTE: 15/0xf => 16 bytes copy). | |
209 | */ | |
210 | static int | |
211 | lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr, | |
212 | u8 const *prefix, u8 pref_post_count, unsigned char *lladdr) | |
213 | { | |
214 | u8 prefcount = pref_post_count >> 4; | |
215 | u8 postcount = pref_post_count & 0x0f; | |
216 | ||
217 | /* full nibble 15 => 16 */ | |
218 | prefcount = (prefcount == 15 ? 16 : prefcount); | |
219 | postcount = (postcount == 15 ? 16 : postcount); | |
220 | ||
221 | if (lladdr) | |
222 | lowpan_raw_dump_inline(__func__, "linklocal address", | |
223 | lladdr, IEEE802154_ALEN); | |
224 | if (prefcount > 0) | |
225 | memcpy(ipaddr, prefix, prefcount); | |
226 | ||
227 | if (prefcount + postcount < 16) | |
228 | memset(&ipaddr->s6_addr[prefcount], 0, | |
229 | 16 - (prefcount + postcount)); | |
230 | ||
231 | if (postcount > 0) { | |
232 | memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount); | |
233 | skb_pull(skb, postcount); | |
234 | } else if (prefcount > 0) { | |
235 | if (lladdr == NULL) | |
236 | return -EINVAL; | |
237 | ||
238 | /* no IID based configuration if no prefix and no data */ | |
239 | lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr); | |
240 | } | |
241 | ||
242 | pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount, | |
243 | postcount); | |
244 | lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | static u8 lowpan_fetch_skb_u8(struct sk_buff *skb) | |
250 | { | |
251 | u8 ret; | |
252 | ||
253 | ret = skb->data[0]; | |
254 | skb_pull(skb, 1); | |
255 | ||
256 | return ret; | |
257 | } | |
258 | ||
719269af | 259 | static u16 lowpan_fetch_skb_u16(struct sk_buff *skb) |
260 | { | |
261 | u16 ret; | |
262 | ||
263 | BUG_ON(!pskb_may_pull(skb, 2)); | |
264 | ||
265 | ret = skb->data[0] | (skb->data[1] << 8); | |
266 | skb_pull(skb, 2); | |
267 | return ret; | |
268 | } | |
269 | ||
44331fe2 AS |
270 | static int lowpan_header_create(struct sk_buff *skb, |
271 | struct net_device *dev, | |
272 | unsigned short type, const void *_daddr, | |
273 | const void *_saddr, unsigned len) | |
274 | { | |
275 | u8 tmp, iphc0, iphc1, *hc06_ptr; | |
276 | struct ipv6hdr *hdr; | |
277 | const u8 *saddr = _saddr; | |
278 | const u8 *daddr = _daddr; | |
279 | u8 *head; | |
280 | struct ieee802154_addr sa, da; | |
281 | ||
282 | if (type != ETH_P_IPV6) | |
283 | return 0; | |
284 | /* TODO: | |
285 | * if this package isn't ipv6 one, where should it be routed? | |
286 | */ | |
287 | head = kzalloc(100, GFP_KERNEL); | |
288 | if (head == NULL) | |
289 | return -ENOMEM; | |
290 | ||
291 | hdr = ipv6_hdr(skb); | |
292 | hc06_ptr = head + 2; | |
293 | ||
294 | pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
295 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__, | |
296 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, | |
297 | hdr->hop_limit); | |
298 | ||
299 | lowpan_raw_dump_table(__func__, "raw skb network header dump", | |
300 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
301 | ||
302 | if (!saddr) | |
303 | saddr = dev->dev_addr; | |
304 | ||
305 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
306 | ||
307 | /* | |
308 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
309 | * we sometimes use |= | |
310 | * If the field is 0, and the current bit value in memory is 1, | |
311 | * this does not work. We therefore reset the IPHC encoding here | |
312 | */ | |
313 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
314 | iphc1 = 0; | |
315 | ||
316 | /* TODO: context lookup */ | |
317 | ||
318 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
319 | ||
320 | /* | |
321 | * Traffic class, flow label | |
322 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
323 | * We have to process both in the same time as the offset of traffic | |
324 | * class depends on the presence of version and flow label | |
325 | */ | |
326 | ||
327 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
328 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
329 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
330 | ||
331 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
332 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
333 | /* flow label can be compressed */ | |
334 | iphc0 |= LOWPAN_IPHC_FL_C; | |
335 | if ((hdr->priority == 0) && | |
336 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
337 | /* compress (elide) all */ | |
338 | iphc0 |= LOWPAN_IPHC_TC_C; | |
339 | } else { | |
340 | /* compress only the flow label */ | |
341 | *hc06_ptr = tmp; | |
342 | hc06_ptr += 1; | |
343 | } | |
344 | } else { | |
345 | /* Flow label cannot be compressed */ | |
346 | if ((hdr->priority == 0) && | |
347 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
348 | /* compress only traffic class */ | |
349 | iphc0 |= LOWPAN_IPHC_TC_C; | |
350 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
351 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
352 | hc06_ptr += 3; | |
353 | } else { | |
354 | /* compress nothing */ | |
355 | memcpy(hc06_ptr, &hdr, 4); | |
356 | /* replace the top byte with new ECN | DSCP format */ | |
357 | *hc06_ptr = tmp; | |
358 | hc06_ptr += 4; | |
359 | } | |
360 | } | |
361 | ||
362 | /* NOTE: payload length is always compressed */ | |
363 | ||
364 | /* Next Header is compress if UDP */ | |
365 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
366 | iphc0 |= LOWPAN_IPHC_NH_C; | |
367 | ||
368 | /* TODO: next header compression */ | |
369 | ||
370 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
371 | *hc06_ptr = hdr->nexthdr; | |
372 | hc06_ptr += 1; | |
373 | } | |
374 | ||
375 | /* | |
376 | * Hop limit | |
377 | * if 1: compress, encoding is 01 | |
378 | * if 64: compress, encoding is 10 | |
379 | * if 255: compress, encoding is 11 | |
380 | * else do not compress | |
381 | */ | |
382 | switch (hdr->hop_limit) { | |
383 | case 1: | |
384 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
385 | break; | |
386 | case 64: | |
387 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
388 | break; | |
389 | case 255: | |
390 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
391 | break; | |
392 | default: | |
393 | *hc06_ptr = hdr->hop_limit; | |
394 | break; | |
395 | } | |
396 | ||
397 | /* source address compression */ | |
398 | if (is_addr_unspecified(&hdr->saddr)) { | |
399 | pr_debug("(%s): source address is unspecified, setting SAC\n", | |
400 | __func__); | |
401 | iphc1 |= LOWPAN_IPHC_SAC; | |
402 | /* TODO: context lookup */ | |
403 | } else if (is_addr_link_local(&hdr->saddr)) { | |
404 | pr_debug("(%s): source address is link-local\n", __func__); | |
405 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
406 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); | |
407 | } else { | |
408 | pr_debug("(%s): send the full source address\n", __func__); | |
409 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); | |
410 | hc06_ptr += 16; | |
411 | } | |
412 | ||
413 | /* destination address compression */ | |
414 | if (is_addr_mcast(&hdr->daddr)) { | |
415 | pr_debug("(%s): destination address is multicast", __func__); | |
416 | iphc1 |= LOWPAN_IPHC_M; | |
417 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
418 | pr_debug("compressed to 1 octet\n"); | |
419 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
420 | /* use last byte */ | |
421 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
422 | hc06_ptr += 1; | |
423 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
424 | pr_debug("compressed to 4 octets\n"); | |
425 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
426 | /* second byte + the last three */ | |
427 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
428 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
429 | hc06_ptr += 4; | |
430 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
431 | pr_debug("compressed to 6 octets\n"); | |
432 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
433 | /* second byte + the last five */ | |
434 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
435 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
436 | hc06_ptr += 6; | |
437 | } else { | |
438 | pr_debug("using full address\n"); | |
439 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
440 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
441 | hc06_ptr += 16; | |
442 | } | |
443 | } else { | |
444 | pr_debug("(%s): destination address is unicast: ", __func__); | |
445 | /* TODO: context lookup */ | |
446 | if (is_addr_link_local(&hdr->daddr)) { | |
447 | pr_debug("destination address is link-local\n"); | |
448 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
449 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); | |
450 | } else { | |
451 | pr_debug("using full address\n"); | |
452 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); | |
453 | hc06_ptr += 16; | |
454 | } | |
455 | } | |
456 | ||
457 | /* TODO: UDP header compression */ | |
458 | /* TODO: Next Header compression */ | |
459 | ||
460 | head[0] = iphc0; | |
461 | head[1] = iphc1; | |
462 | ||
463 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
464 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
465 | ||
466 | kfree(head); | |
467 | ||
468 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
469 | skb->len); | |
470 | ||
471 | /* | |
472 | * NOTE1: I'm still unsure about the fact that compression and WPAN | |
473 | * header are created here and not later in the xmit. So wait for | |
474 | * an opinion of net maintainers. | |
475 | */ | |
476 | /* | |
477 | * NOTE2: to be absolutely correct, we must derive PANid information | |
478 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
479 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
480 | */ | |
481 | { | |
482 | /* prepare wpan address data */ | |
483 | sa.addr_type = IEEE802154_ADDR_LONG; | |
484 | sa.pan_id = 0xff; | |
485 | ||
486 | da.addr_type = IEEE802154_ADDR_LONG; | |
487 | da.pan_id = 0xff; | |
488 | ||
489 | memcpy(&(da.hwaddr), daddr, 8); | |
490 | memcpy(&(sa.hwaddr), saddr, 8); | |
491 | ||
492 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; | |
719269af | 493 | |
44331fe2 AS |
494 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
495 | type, (void *)&da, (void *)&sa, skb->len); | |
496 | } | |
497 | } | |
498 | ||
499 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) | |
500 | { | |
501 | struct sk_buff *new; | |
502 | struct lowpan_dev_record *entry; | |
503 | int stat = NET_RX_SUCCESS; | |
504 | ||
505 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
dcef1151 | 506 | GFP_ATOMIC); |
44331fe2 AS |
507 | kfree_skb(skb); |
508 | ||
dcef1151 | 509 | if (!new) |
44331fe2 AS |
510 | return -ENOMEM; |
511 | ||
512 | skb_push(new, sizeof(struct ipv6hdr)); | |
513 | skb_reset_network_header(new); | |
514 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
515 | ||
516 | new->protocol = htons(ETH_P_IPV6); | |
517 | new->pkt_type = PACKET_HOST; | |
518 | ||
519 | rcu_read_lock(); | |
520 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
521 | if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) { | |
dcef1151 | 522 | skb = skb_copy(new, GFP_ATOMIC); |
523 | if (!skb) { | |
524 | stat = -ENOMEM; | |
525 | break; | |
526 | } | |
44331fe2 | 527 | |
dcef1151 | 528 | skb->dev = entry->ldev; |
529 | stat = netif_rx(skb); | |
44331fe2 AS |
530 | } |
531 | rcu_read_unlock(); | |
532 | ||
533 | kfree_skb(new); | |
534 | ||
535 | return stat; | |
536 | } | |
537 | ||
719269af | 538 | static void lowpan_fragment_timer_expired(unsigned long entry_addr) |
539 | { | |
540 | struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; | |
541 | ||
542 | pr_debug("%s: timer expired for frame with tag %d\n", __func__, | |
543 | entry->tag); | |
544 | ||
545 | spin_lock(&flist_lock); | |
546 | list_del(&entry->list); | |
547 | spin_unlock(&flist_lock); | |
548 | ||
549 | dev_kfree_skb(entry->skb); | |
550 | kfree(entry); | |
551 | } | |
552 | ||
44331fe2 AS |
553 | static int |
554 | lowpan_process_data(struct sk_buff *skb) | |
555 | { | |
556 | struct ipv6hdr hdr; | |
557 | u8 tmp, iphc0, iphc1, num_context = 0; | |
558 | u8 *_saddr, *_daddr; | |
559 | int err; | |
560 | ||
561 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
562 | skb->len); | |
563 | /* at least two bytes will be used for the encoding */ | |
564 | if (skb->len < 2) | |
565 | goto drop; | |
566 | iphc0 = lowpan_fetch_skb_u8(skb); | |
719269af | 567 | |
568 | /* fragments assembling */ | |
569 | switch (iphc0 & LOWPAN_DISPATCH_MASK) { | |
570 | case LOWPAN_DISPATCH_FRAG1: | |
571 | case LOWPAN_DISPATCH_FRAGN: | |
572 | { | |
573 | struct lowpan_fragment *frame; | |
574 | u8 len, offset; | |
575 | u16 tag; | |
576 | bool found = false; | |
577 | ||
578 | len = lowpan_fetch_skb_u8(skb); /* frame length */ | |
579 | tag = lowpan_fetch_skb_u16(skb); | |
580 | ||
581 | /* | |
582 | * check if frame assembling with the same tag is | |
583 | * already in progress | |
584 | */ | |
585 | spin_lock(&flist_lock); | |
586 | ||
587 | list_for_each_entry(frame, &lowpan_fragments, list) | |
588 | if (frame->tag == tag) { | |
589 | found = true; | |
590 | break; | |
591 | } | |
592 | ||
593 | /* alloc new frame structure */ | |
594 | if (!found) { | |
595 | frame = kzalloc(sizeof(struct lowpan_fragment), | |
596 | GFP_ATOMIC); | |
597 | if (!frame) | |
598 | goto unlock_and_drop; | |
599 | ||
600 | INIT_LIST_HEAD(&frame->list); | |
601 | ||
602 | frame->length = (iphc0 & 7) | (len << 3); | |
603 | frame->tag = tag; | |
604 | ||
605 | /* allocate buffer for frame assembling */ | |
606 | frame->skb = alloc_skb(frame->length + | |
607 | sizeof(struct ipv6hdr), GFP_ATOMIC); | |
608 | ||
609 | if (!frame->skb) { | |
610 | kfree(frame); | |
611 | goto unlock_and_drop; | |
612 | } | |
613 | ||
614 | frame->skb->priority = skb->priority; | |
615 | frame->skb->dev = skb->dev; | |
616 | ||
617 | /* reserve headroom for uncompressed ipv6 header */ | |
618 | skb_reserve(frame->skb, sizeof(struct ipv6hdr)); | |
619 | skb_put(frame->skb, frame->length); | |
620 | ||
621 | init_timer(&frame->timer); | |
622 | /* time out is the same as for ipv6 - 60 sec */ | |
623 | frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; | |
624 | frame->timer.data = (unsigned long)frame; | |
625 | frame->timer.function = lowpan_fragment_timer_expired; | |
626 | ||
627 | add_timer(&frame->timer); | |
628 | ||
629 | list_add_tail(&frame->list, &lowpan_fragments); | |
630 | } | |
631 | ||
632 | if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) | |
633 | goto unlock_and_drop; | |
634 | ||
635 | offset = lowpan_fetch_skb_u8(skb); /* fetch offset */ | |
636 | ||
637 | /* if payload fits buffer, copy it */ | |
638 | if (likely((offset * 8 + skb->len) <= frame->length)) | |
639 | skb_copy_to_linear_data_offset(frame->skb, offset * 8, | |
640 | skb->data, skb->len); | |
641 | else | |
642 | goto unlock_and_drop; | |
643 | ||
644 | frame->bytes_rcv += skb->len; | |
645 | ||
646 | /* frame assembling complete */ | |
647 | if ((frame->bytes_rcv == frame->length) && | |
648 | frame->timer.expires > jiffies) { | |
649 | /* if timer haven't expired - first of all delete it */ | |
650 | del_timer(&frame->timer); | |
651 | list_del(&frame->list); | |
652 | spin_unlock(&flist_lock); | |
653 | ||
654 | dev_kfree_skb(skb); | |
655 | skb = frame->skb; | |
656 | kfree(frame); | |
657 | iphc0 = lowpan_fetch_skb_u8(skb); | |
658 | break; | |
659 | } | |
660 | spin_unlock(&flist_lock); | |
661 | ||
662 | return kfree_skb(skb), 0; | |
663 | } | |
664 | default: | |
665 | break; | |
666 | } | |
667 | ||
44331fe2 AS |
668 | iphc1 = lowpan_fetch_skb_u8(skb); |
669 | ||
670 | _saddr = mac_cb(skb)->sa.hwaddr; | |
671 | _daddr = mac_cb(skb)->da.hwaddr; | |
672 | ||
673 | pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1); | |
674 | ||
675 | /* another if the CID flag is set */ | |
676 | if (iphc1 & LOWPAN_IPHC_CID) { | |
677 | pr_debug("(%s): CID flag is set, increase header with one\n", | |
678 | __func__); | |
679 | if (!skb->len) | |
680 | goto drop; | |
681 | num_context = lowpan_fetch_skb_u8(skb); | |
682 | } | |
683 | ||
684 | hdr.version = 6; | |
685 | ||
686 | /* Traffic Class and Flow Label */ | |
687 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
688 | /* | |
689 | * Traffic Class and FLow Label carried in-line | |
690 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
691 | */ | |
692 | case 0: /* 00b */ | |
693 | if (!skb->len) | |
694 | goto drop; | |
695 | tmp = lowpan_fetch_skb_u8(skb); | |
696 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); | |
697 | skb_pull(skb, 3); | |
698 | hdr.priority = ((tmp >> 2) & 0x0f); | |
699 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
700 | (hdr.flow_lbl[0] & 0x0f); | |
701 | break; | |
702 | /* | |
703 | * Traffic class carried in-line | |
704 | * ECN + DSCP (1 byte), Flow Label is elided | |
705 | */ | |
706 | case 1: /* 10b */ | |
707 | if (!skb->len) | |
708 | goto drop; | |
709 | tmp = lowpan_fetch_skb_u8(skb); | |
710 | hdr.priority = ((tmp >> 2) & 0x0f); | |
711 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
712 | hdr.flow_lbl[1] = 0; | |
713 | hdr.flow_lbl[2] = 0; | |
714 | break; | |
715 | /* | |
716 | * Flow Label carried in-line | |
717 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
718 | */ | |
719 | case 2: /* 01b */ | |
720 | if (!skb->len) | |
721 | goto drop; | |
722 | tmp = lowpan_fetch_skb_u8(skb); | |
723 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); | |
724 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
725 | skb_pull(skb, 2); | |
726 | break; | |
727 | /* Traffic Class and Flow Label are elided */ | |
728 | case 3: /* 11b */ | |
729 | hdr.priority = 0; | |
730 | hdr.flow_lbl[0] = 0; | |
731 | hdr.flow_lbl[1] = 0; | |
732 | hdr.flow_lbl[2] = 0; | |
733 | break; | |
734 | default: | |
735 | break; | |
736 | } | |
737 | ||
738 | /* Next Header */ | |
739 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
740 | /* Next header is carried inline */ | |
741 | if (!skb->len) | |
742 | goto drop; | |
743 | hdr.nexthdr = lowpan_fetch_skb_u8(skb); | |
744 | pr_debug("(%s): NH flag is set, next header is carried " | |
745 | "inline: %02x\n", __func__, hdr.nexthdr); | |
746 | } | |
747 | ||
748 | /* Hop Limit */ | |
749 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
750 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
751 | else { | |
752 | if (!skb->len) | |
753 | goto drop; | |
754 | hdr.hop_limit = lowpan_fetch_skb_u8(skb); | |
755 | } | |
756 | ||
757 | /* Extract SAM to the tmp variable */ | |
758 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
759 | ||
760 | /* Source address uncompression */ | |
761 | pr_debug("(%s): source address stateless compression\n", __func__); | |
762 | err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix, | |
763 | lowpan_unc_llconf[tmp], skb->data); | |
764 | if (err) | |
765 | goto drop; | |
766 | ||
767 | /* Extract DAM to the tmp variable */ | |
768 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
769 | ||
770 | /* check for Multicast Compression */ | |
771 | if (iphc1 & LOWPAN_IPHC_M) { | |
772 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
773 | pr_debug("(%s): destination address context-based " | |
774 | "multicast compression\n", __func__); | |
775 | /* TODO: implement this */ | |
776 | } else { | |
777 | u8 prefix[] = {0xff, 0x02}; | |
778 | ||
779 | pr_debug("(%s): destination address non-context-based" | |
780 | " multicast compression\n", __func__); | |
781 | if (0 < tmp && tmp < 3) { | |
782 | if (!skb->len) | |
783 | goto drop; | |
784 | else | |
785 | prefix[1] = lowpan_fetch_skb_u8(skb); | |
786 | } | |
787 | ||
788 | err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix, | |
789 | lowpan_unc_mxconf[tmp], NULL); | |
790 | if (err) | |
791 | goto drop; | |
792 | } | |
793 | } else { | |
794 | pr_debug("(%s): destination address stateless compression\n", | |
795 | __func__); | |
796 | err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, | |
797 | lowpan_unc_llconf[tmp], skb->data); | |
798 | if (err) | |
799 | goto drop; | |
800 | } | |
801 | ||
802 | /* TODO: UDP header parse */ | |
803 | ||
804 | /* Not fragmented package */ | |
805 | hdr.payload_len = htons(skb->len); | |
806 | ||
807 | pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__, | |
808 | skb_headroom(skb), skb->len); | |
809 | ||
810 | pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
811 | "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version, | |
812 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); | |
813 | ||
814 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
815 | sizeof(hdr)); | |
816 | return lowpan_skb_deliver(skb, &hdr); | |
719269af | 817 | |
818 | unlock_and_drop: | |
819 | spin_unlock(&flist_lock); | |
44331fe2 | 820 | drop: |
90d0963d | 821 | kfree_skb(skb); |
44331fe2 AS |
822 | return -EINVAL; |
823 | } | |
824 | ||
825 | static int lowpan_set_address(struct net_device *dev, void *p) | |
826 | { | |
827 | struct sockaddr *sa = p; | |
828 | ||
829 | if (netif_running(dev)) | |
830 | return -EBUSY; | |
831 | ||
832 | /* TODO: validate addr */ | |
833 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
834 | ||
835 | return 0; | |
836 | } | |
837 | ||
719269af | 838 | static int lowpan_get_mac_header_length(struct sk_buff *skb) |
839 | { | |
840 | /* | |
841 | * Currently long addressing mode is supported only, so the overall | |
842 | * header size is 21: | |
843 | * FC SeqNum DPAN DA SA Sec | |
844 | * 2 + 1 + 2 + 8 + 8 + 0 = 21 | |
845 | */ | |
846 | return 21; | |
847 | } | |
848 | ||
849 | static int | |
850 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, | |
851 | int mlen, int plen, int offset) | |
852 | { | |
853 | struct sk_buff *frag; | |
854 | int hlen, ret; | |
855 | ||
856 | /* if payload length is zero, therefore it's a first fragment */ | |
857 | hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE); | |
858 | ||
859 | lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); | |
860 | ||
861 | frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE); | |
862 | if (!frag) | |
863 | return -ENOMEM; | |
864 | ||
865 | frag->priority = skb->priority; | |
866 | frag->dev = skb->dev; | |
867 | ||
868 | /* copy header, MFR and payload */ | |
869 | memcpy(skb_put(frag, mlen), skb->data, mlen); | |
870 | memcpy(skb_put(frag, hlen), head, hlen); | |
871 | ||
872 | if (plen) | |
873 | skb_copy_from_linear_data_offset(skb, offset + mlen, | |
874 | skb_put(frag, plen), plen); | |
875 | ||
876 | lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, | |
877 | frag->len); | |
878 | ||
879 | ret = dev_queue_xmit(frag); | |
880 | ||
881 | if (ret < 0) | |
882 | dev_kfree_skb(frag); | |
883 | ||
884 | return ret; | |
885 | } | |
886 | ||
887 | static int | |
888 | lowpan_skb_fragmentation(struct sk_buff *skb) | |
889 | { | |
890 | int err, header_length, payload_length, tag, offset = 0; | |
891 | u8 head[5]; | |
892 | ||
893 | header_length = lowpan_get_mac_header_length(skb); | |
894 | payload_length = skb->len - header_length; | |
895 | tag = fragment_tag++; | |
896 | ||
897 | /* first fragment header */ | |
898 | head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7); | |
899 | head[1] = (payload_length >> 3) & 0xff; | |
900 | head[2] = tag & 0xff; | |
901 | head[3] = tag >> 8; | |
902 | ||
903 | err = lowpan_fragment_xmit(skb, head, header_length, 0, 0); | |
904 | ||
905 | /* next fragment header */ | |
906 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
907 | head[0] |= LOWPAN_DISPATCH_FRAGN; | |
908 | ||
909 | while ((payload_length - offset > 0) && (err >= 0)) { | |
910 | int len = LOWPAN_FRAG_SIZE; | |
911 | ||
912 | head[4] = offset / 8; | |
913 | ||
914 | if (payload_length - offset < len) | |
915 | len = payload_length - offset; | |
916 | ||
917 | err = lowpan_fragment_xmit(skb, head, header_length, | |
918 | len, offset); | |
919 | offset += len; | |
920 | } | |
921 | ||
922 | return err; | |
923 | } | |
924 | ||
44331fe2 AS |
925 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
926 | { | |
719269af | 927 | int err = -1; |
44331fe2 AS |
928 | |
929 | pr_debug("(%s): package xmit\n", __func__); | |
930 | ||
931 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
932 | if (skb->dev == NULL) { | |
933 | pr_debug("(%s) ERROR: no real wpan device found\n", __func__); | |
719269af | 934 | goto error; |
935 | } | |
936 | ||
937 | if (skb->len <= IEEE802154_MTU) { | |
44331fe2 | 938 | err = dev_queue_xmit(skb); |
719269af | 939 | goto out; |
940 | } | |
941 | ||
942 | pr_debug("(%s): frame is too big, fragmentation is needed\n", | |
943 | __func__); | |
944 | err = lowpan_skb_fragmentation(skb); | |
945 | error: | |
946 | dev_kfree_skb(skb); | |
947 | out: | |
948 | if (err < 0) | |
949 | pr_debug("(%s): ERROR: xmit failed\n", __func__); | |
44331fe2 AS |
950 | |
951 | return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK); | |
952 | } | |
953 | ||
954 | static void lowpan_dev_free(struct net_device *dev) | |
955 | { | |
956 | dev_put(lowpan_dev_info(dev)->real_dev); | |
957 | free_netdev(dev); | |
958 | } | |
959 | ||
960 | static struct header_ops lowpan_header_ops = { | |
961 | .create = lowpan_header_create, | |
962 | }; | |
963 | ||
964 | static const struct net_device_ops lowpan_netdev_ops = { | |
965 | .ndo_start_xmit = lowpan_xmit, | |
966 | .ndo_set_mac_address = lowpan_set_address, | |
967 | }; | |
968 | ||
969 | static void lowpan_setup(struct net_device *dev) | |
970 | { | |
971 | pr_debug("(%s)\n", __func__); | |
972 | ||
973 | dev->addr_len = IEEE802154_ADDR_LEN; | |
974 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
975 | dev->type = ARPHRD_IEEE802154; | |
976 | dev->features = NETIF_F_NO_CSUM; | |
977 | /* Frame Control + Sequence Number + Address fields + Security Header */ | |
978 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
979 | dev->needed_tailroom = 2; /* FCS */ | |
980 | dev->mtu = 1281; | |
981 | dev->tx_queue_len = 0; | |
982 | dev->flags = IFF_NOARP | IFF_BROADCAST; | |
983 | dev->watchdog_timeo = 0; | |
984 | ||
985 | dev->netdev_ops = &lowpan_netdev_ops; | |
986 | dev->header_ops = &lowpan_header_ops; | |
987 | dev->destructor = lowpan_dev_free; | |
988 | } | |
989 | ||
990 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
991 | { | |
992 | pr_debug("(%s)\n", __func__); | |
993 | ||
994 | if (tb[IFLA_ADDRESS]) { | |
995 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
996 | return -EINVAL; | |
997 | } | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
1002 | struct packet_type *pt, struct net_device *orig_dev) | |
1003 | { | |
1004 | if (!netif_running(dev)) | |
1005 | goto drop; | |
1006 | ||
1007 | if (dev->type != ARPHRD_IEEE802154) | |
1008 | goto drop; | |
1009 | ||
1010 | /* check that it's our buffer */ | |
719269af | 1011 | switch (skb->data[0] & 0xe0) { |
1012 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
1013 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ | |
1014 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ | |
44331fe2 | 1015 | lowpan_process_data(skb); |
719269af | 1016 | break; |
1017 | default: | |
1018 | break; | |
1019 | } | |
44331fe2 AS |
1020 | |
1021 | return NET_RX_SUCCESS; | |
1022 | ||
1023 | drop: | |
1024 | kfree_skb(skb); | |
1025 | return NET_RX_DROP; | |
1026 | } | |
1027 | ||
1028 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
1029 | struct nlattr *tb[], struct nlattr *data[]) | |
1030 | { | |
1031 | struct net_device *real_dev; | |
1032 | struct lowpan_dev_record *entry; | |
1033 | ||
1034 | pr_debug("(%s)\n", __func__); | |
1035 | ||
1036 | if (!tb[IFLA_LINK]) | |
1037 | return -EINVAL; | |
1038 | /* find and hold real wpan device */ | |
1039 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
1040 | if (!real_dev) | |
1041 | return -ENODEV; | |
1042 | ||
1043 | lowpan_dev_info(dev)->real_dev = real_dev; | |
1044 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); | |
1045 | ||
1046 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); | |
dc00fd44 DC |
1047 | if (!entry) { |
1048 | dev_put(real_dev); | |
1049 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 1050 | return -ENOMEM; |
dc00fd44 | 1051 | } |
44331fe2 AS |
1052 | |
1053 | entry->ldev = dev; | |
1054 | ||
1055 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1056 | INIT_LIST_HEAD(&entry->list); | |
1057 | list_add_tail(&entry->list, &lowpan_devices); | |
1058 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1059 | ||
1060 | register_netdevice(dev); | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
1066 | { | |
1067 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
1068 | struct net_device *real_dev = lowpan_dev->real_dev; | |
1069 | struct lowpan_dev_record *entry; | |
aec9db35 | 1070 | struct lowpan_dev_record *tmp; |
44331fe2 AS |
1071 | |
1072 | ASSERT_RTNL(); | |
1073 | ||
1074 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
aec9db35 | 1075 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
1076 | if (entry->ldev == dev) { |
1077 | list_del(&entry->list); | |
1078 | kfree(entry); | |
1079 | } | |
aec9db35 | 1080 | } |
44331fe2 AS |
1081 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
1082 | ||
1083 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
1084 | ||
1085 | unregister_netdevice_queue(dev, head); | |
1086 | ||
1087 | dev_put(real_dev); | |
1088 | } | |
1089 | ||
1090 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
1091 | .kind = "lowpan", | |
1092 | .priv_size = sizeof(struct lowpan_dev_info), | |
1093 | .setup = lowpan_setup, | |
1094 | .newlink = lowpan_newlink, | |
1095 | .dellink = lowpan_dellink, | |
1096 | .validate = lowpan_validate, | |
1097 | }; | |
1098 | ||
1099 | static inline int __init lowpan_netlink_init(void) | |
1100 | { | |
1101 | return rtnl_link_register(&lowpan_link_ops); | |
1102 | } | |
1103 | ||
1104 | static inline void __init lowpan_netlink_fini(void) | |
1105 | { | |
1106 | rtnl_link_unregister(&lowpan_link_ops); | |
1107 | } | |
1108 | ||
1109 | static struct packet_type lowpan_packet_type = { | |
1110 | .type = __constant_htons(ETH_P_IEEE802154), | |
1111 | .func = lowpan_rcv, | |
1112 | }; | |
1113 | ||
1114 | static int __init lowpan_init_module(void) | |
1115 | { | |
1116 | int err = 0; | |
1117 | ||
1118 | pr_debug("(%s)\n", __func__); | |
1119 | ||
1120 | err = lowpan_netlink_init(); | |
1121 | if (err < 0) | |
1122 | goto out; | |
1123 | ||
1124 | dev_add_pack(&lowpan_packet_type); | |
1125 | out: | |
1126 | return err; | |
1127 | } | |
1128 | ||
1129 | static void __exit lowpan_cleanup_module(void) | |
1130 | { | |
1131 | pr_debug("(%s)\n", __func__); | |
1132 | ||
1133 | lowpan_netlink_fini(); | |
1134 | ||
1135 | dev_remove_pack(&lowpan_packet_type); | |
1136 | } | |
1137 | ||
1138 | module_init(lowpan_init_module); | |
1139 | module_exit(lowpan_cleanup_module); | |
1140 | MODULE_LICENSE("GPL"); | |
1141 | MODULE_ALIAS_RTNL_LINK("lowpan"); |