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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 | ||
53 | #define DEBUG | |
54 | ||
55 | #include <linux/bitops.h> | |
56 | #include <linux/if_arp.h> | |
57 | #include <linux/module.h> | |
58 | #include <linux/moduleparam.h> | |
59 | #include <linux/netdevice.h> | |
60 | #include <net/af_ieee802154.h> | |
61 | #include <net/ieee802154.h> | |
62 | #include <net/ieee802154_netdev.h> | |
63 | #include <net/ipv6.h> | |
64 | ||
65 | #include "6lowpan.h" | |
66 | ||
67 | /* TTL uncompression values */ | |
68 | static const u8 lowpan_ttl_values[] = {0, 1, 64, 255}; | |
69 | ||
70 | static LIST_HEAD(lowpan_devices); | |
71 | ||
72 | /* | |
73 | * Uncompression of linklocal: | |
74 | * 0 -> 16 bytes from packet | |
75 | * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet | |
76 | * 2 -> 2 bytes from prefix - zeroes + 2 from packet | |
77 | * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr | |
78 | * | |
79 | * NOTE: => the uncompress function does change 0xf to 0x10 | |
80 | * NOTE: 0x00 => no-autoconfig => unspecified | |
81 | */ | |
82 | static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20}; | |
83 | ||
84 | /* | |
85 | * Uncompression of ctx-based: | |
86 | * 0 -> 0 bits from packet [unspecified / reserved] | |
87 | * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet | |
88 | * 2 -> 8 bytes from prefix - zeroes + 2 from packet | |
89 | * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr | |
90 | */ | |
91 | static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80}; | |
92 | ||
93 | /* | |
94 | * Uncompression of ctx-base | |
95 | * 0 -> 0 bits from packet | |
96 | * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet | |
97 | * 2 -> 2 bytes from prefix - zeroes + 3 from packet | |
98 | * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr | |
99 | */ | |
100 | static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21}; | |
101 | ||
102 | /* Link local prefix */ | |
103 | static const u8 lowpan_llprefix[] = {0xfe, 0x80}; | |
104 | ||
105 | /* private device info */ | |
106 | struct lowpan_dev_info { | |
107 | struct net_device *real_dev; /* real WPAN device ptr */ | |
108 | struct mutex dev_list_mtx; /* mutex for list ops */ | |
109 | }; | |
110 | ||
111 | struct lowpan_dev_record { | |
112 | struct net_device *ldev; | |
113 | struct list_head list; | |
114 | }; | |
115 | ||
116 | static inline struct | |
117 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
118 | { | |
119 | return netdev_priv(dev); | |
120 | } | |
121 | ||
122 | static inline void lowpan_address_flip(u8 *src, u8 *dest) | |
123 | { | |
124 | int i; | |
125 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) | |
126 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; | |
127 | } | |
128 | ||
129 | /* list of all 6lowpan devices, uses for package delivering */ | |
130 | /* print data in line */ | |
131 | static inline void lowpan_raw_dump_inline(const char *caller, char *msg, | |
132 | unsigned char *buf, int len) | |
133 | { | |
134 | #ifdef DEBUG | |
135 | if (msg) | |
136 | pr_debug("(%s) %s: ", caller, msg); | |
137 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, | |
138 | 16, 1, buf, len, false); | |
139 | #endif /* DEBUG */ | |
140 | } | |
141 | ||
142 | /* | |
143 | * print data in a table format: | |
144 | * | |
145 | * addr: xx xx xx xx xx xx | |
146 | * addr: xx xx xx xx xx xx | |
147 | * ... | |
148 | */ | |
149 | static inline void lowpan_raw_dump_table(const char *caller, char *msg, | |
150 | unsigned char *buf, int len) | |
151 | { | |
152 | #ifdef DEBUG | |
153 | if (msg) | |
154 | pr_debug("(%s) %s:\n", caller, msg); | |
155 | print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, | |
156 | 16, 1, buf, len, false); | |
157 | #endif /* DEBUG */ | |
158 | } | |
159 | ||
160 | static u8 | |
161 | lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr, | |
162 | const unsigned char *lladdr) | |
163 | { | |
164 | u8 val = 0; | |
165 | ||
166 | if (is_addr_mac_addr_based(ipaddr, lladdr)) | |
167 | val = 3; /* 0-bits */ | |
168 | else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
169 | /* compress IID to 16 bits xxxx::XXXX */ | |
170 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); | |
171 | *hc06_ptr += 2; | |
172 | val = 2; /* 16-bits */ | |
173 | } else { | |
174 | /* do not compress IID => xxxx::IID */ | |
175 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); | |
176 | *hc06_ptr += 8; | |
177 | val = 1; /* 64-bits */ | |
178 | } | |
179 | ||
180 | return rol8(val, shift); | |
181 | } | |
182 | ||
183 | static void | |
184 | lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr) | |
185 | { | |
186 | memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ALEN); | |
187 | /* second bit-flip (Universe/Local) is done according RFC2464 */ | |
188 | ipaddr->s6_addr[8] ^= 0x02; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Uncompress addresses based on a prefix and a postfix with zeroes in | |
193 | * between. If the postfix is zero in length it will use the link address | |
194 | * to configure the IP address (autoconf style). | |
195 | * pref_post_count takes a byte where the first nibble specify prefix count | |
196 | * and the second postfix count (NOTE: 15/0xf => 16 bytes copy). | |
197 | */ | |
198 | static int | |
199 | lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr, | |
200 | u8 const *prefix, u8 pref_post_count, unsigned char *lladdr) | |
201 | { | |
202 | u8 prefcount = pref_post_count >> 4; | |
203 | u8 postcount = pref_post_count & 0x0f; | |
204 | ||
205 | /* full nibble 15 => 16 */ | |
206 | prefcount = (prefcount == 15 ? 16 : prefcount); | |
207 | postcount = (postcount == 15 ? 16 : postcount); | |
208 | ||
209 | if (lladdr) | |
210 | lowpan_raw_dump_inline(__func__, "linklocal address", | |
211 | lladdr, IEEE802154_ALEN); | |
212 | if (prefcount > 0) | |
213 | memcpy(ipaddr, prefix, prefcount); | |
214 | ||
215 | if (prefcount + postcount < 16) | |
216 | memset(&ipaddr->s6_addr[prefcount], 0, | |
217 | 16 - (prefcount + postcount)); | |
218 | ||
219 | if (postcount > 0) { | |
220 | memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount); | |
221 | skb_pull(skb, postcount); | |
222 | } else if (prefcount > 0) { | |
223 | if (lladdr == NULL) | |
224 | return -EINVAL; | |
225 | ||
226 | /* no IID based configuration if no prefix and no data */ | |
227 | lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr); | |
228 | } | |
229 | ||
230 | pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount, | |
231 | postcount); | |
232 | lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static u8 lowpan_fetch_skb_u8(struct sk_buff *skb) | |
238 | { | |
239 | u8 ret; | |
240 | ||
241 | ret = skb->data[0]; | |
242 | skb_pull(skb, 1); | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
247 | static int lowpan_header_create(struct sk_buff *skb, | |
248 | struct net_device *dev, | |
249 | unsigned short type, const void *_daddr, | |
250 | const void *_saddr, unsigned len) | |
251 | { | |
252 | u8 tmp, iphc0, iphc1, *hc06_ptr; | |
253 | struct ipv6hdr *hdr; | |
254 | const u8 *saddr = _saddr; | |
255 | const u8 *daddr = _daddr; | |
256 | u8 *head; | |
257 | struct ieee802154_addr sa, da; | |
258 | ||
259 | if (type != ETH_P_IPV6) | |
260 | return 0; | |
261 | /* TODO: | |
262 | * if this package isn't ipv6 one, where should it be routed? | |
263 | */ | |
264 | head = kzalloc(100, GFP_KERNEL); | |
265 | if (head == NULL) | |
266 | return -ENOMEM; | |
267 | ||
268 | hdr = ipv6_hdr(skb); | |
269 | hc06_ptr = head + 2; | |
270 | ||
271 | pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
272 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__, | |
273 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, | |
274 | hdr->hop_limit); | |
275 | ||
276 | lowpan_raw_dump_table(__func__, "raw skb network header dump", | |
277 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
278 | ||
279 | if (!saddr) | |
280 | saddr = dev->dev_addr; | |
281 | ||
282 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
283 | ||
284 | /* | |
285 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
286 | * we sometimes use |= | |
287 | * If the field is 0, and the current bit value in memory is 1, | |
288 | * this does not work. We therefore reset the IPHC encoding here | |
289 | */ | |
290 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
291 | iphc1 = 0; | |
292 | ||
293 | /* TODO: context lookup */ | |
294 | ||
295 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
296 | ||
297 | /* | |
298 | * Traffic class, flow label | |
299 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
300 | * We have to process both in the same time as the offset of traffic | |
301 | * class depends on the presence of version and flow label | |
302 | */ | |
303 | ||
304 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
305 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
306 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
307 | ||
308 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
309 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
310 | /* flow label can be compressed */ | |
311 | iphc0 |= LOWPAN_IPHC_FL_C; | |
312 | if ((hdr->priority == 0) && | |
313 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
314 | /* compress (elide) all */ | |
315 | iphc0 |= LOWPAN_IPHC_TC_C; | |
316 | } else { | |
317 | /* compress only the flow label */ | |
318 | *hc06_ptr = tmp; | |
319 | hc06_ptr += 1; | |
320 | } | |
321 | } else { | |
322 | /* Flow label cannot be compressed */ | |
323 | if ((hdr->priority == 0) && | |
324 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
325 | /* compress only traffic class */ | |
326 | iphc0 |= LOWPAN_IPHC_TC_C; | |
327 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
328 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
329 | hc06_ptr += 3; | |
330 | } else { | |
331 | /* compress nothing */ | |
332 | memcpy(hc06_ptr, &hdr, 4); | |
333 | /* replace the top byte with new ECN | DSCP format */ | |
334 | *hc06_ptr = tmp; | |
335 | hc06_ptr += 4; | |
336 | } | |
337 | } | |
338 | ||
339 | /* NOTE: payload length is always compressed */ | |
340 | ||
341 | /* Next Header is compress if UDP */ | |
342 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
343 | iphc0 |= LOWPAN_IPHC_NH_C; | |
344 | ||
345 | /* TODO: next header compression */ | |
346 | ||
347 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
348 | *hc06_ptr = hdr->nexthdr; | |
349 | hc06_ptr += 1; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Hop limit | |
354 | * if 1: compress, encoding is 01 | |
355 | * if 64: compress, encoding is 10 | |
356 | * if 255: compress, encoding is 11 | |
357 | * else do not compress | |
358 | */ | |
359 | switch (hdr->hop_limit) { | |
360 | case 1: | |
361 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
362 | break; | |
363 | case 64: | |
364 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
365 | break; | |
366 | case 255: | |
367 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
368 | break; | |
369 | default: | |
370 | *hc06_ptr = hdr->hop_limit; | |
371 | break; | |
372 | } | |
373 | ||
374 | /* source address compression */ | |
375 | if (is_addr_unspecified(&hdr->saddr)) { | |
376 | pr_debug("(%s): source address is unspecified, setting SAC\n", | |
377 | __func__); | |
378 | iphc1 |= LOWPAN_IPHC_SAC; | |
379 | /* TODO: context lookup */ | |
380 | } else if (is_addr_link_local(&hdr->saddr)) { | |
381 | pr_debug("(%s): source address is link-local\n", __func__); | |
382 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
383 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); | |
384 | } else { | |
385 | pr_debug("(%s): send the full source address\n", __func__); | |
386 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); | |
387 | hc06_ptr += 16; | |
388 | } | |
389 | ||
390 | /* destination address compression */ | |
391 | if (is_addr_mcast(&hdr->daddr)) { | |
392 | pr_debug("(%s): destination address is multicast", __func__); | |
393 | iphc1 |= LOWPAN_IPHC_M; | |
394 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
395 | pr_debug("compressed to 1 octet\n"); | |
396 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
397 | /* use last byte */ | |
398 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
399 | hc06_ptr += 1; | |
400 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
401 | pr_debug("compressed to 4 octets\n"); | |
402 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
403 | /* second byte + the last three */ | |
404 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
405 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
406 | hc06_ptr += 4; | |
407 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
408 | pr_debug("compressed to 6 octets\n"); | |
409 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
410 | /* second byte + the last five */ | |
411 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
412 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
413 | hc06_ptr += 6; | |
414 | } else { | |
415 | pr_debug("using full address\n"); | |
416 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
417 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
418 | hc06_ptr += 16; | |
419 | } | |
420 | } else { | |
421 | pr_debug("(%s): destination address is unicast: ", __func__); | |
422 | /* TODO: context lookup */ | |
423 | if (is_addr_link_local(&hdr->daddr)) { | |
424 | pr_debug("destination address is link-local\n"); | |
425 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
426 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); | |
427 | } else { | |
428 | pr_debug("using full address\n"); | |
429 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); | |
430 | hc06_ptr += 16; | |
431 | } | |
432 | } | |
433 | ||
434 | /* TODO: UDP header compression */ | |
435 | /* TODO: Next Header compression */ | |
436 | ||
437 | head[0] = iphc0; | |
438 | head[1] = iphc1; | |
439 | ||
440 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
441 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
442 | ||
443 | kfree(head); | |
444 | ||
445 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
446 | skb->len); | |
447 | ||
448 | /* | |
449 | * NOTE1: I'm still unsure about the fact that compression and WPAN | |
450 | * header are created here and not later in the xmit. So wait for | |
451 | * an opinion of net maintainers. | |
452 | */ | |
453 | /* | |
454 | * NOTE2: to be absolutely correct, we must derive PANid information | |
455 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
456 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
457 | */ | |
458 | { | |
459 | /* prepare wpan address data */ | |
460 | sa.addr_type = IEEE802154_ADDR_LONG; | |
461 | sa.pan_id = 0xff; | |
462 | ||
463 | da.addr_type = IEEE802154_ADDR_LONG; | |
464 | da.pan_id = 0xff; | |
465 | ||
466 | memcpy(&(da.hwaddr), daddr, 8); | |
467 | memcpy(&(sa.hwaddr), saddr, 8); | |
468 | ||
469 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; | |
470 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, | |
471 | type, (void *)&da, (void *)&sa, skb->len); | |
472 | } | |
473 | } | |
474 | ||
475 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) | |
476 | { | |
477 | struct sk_buff *new; | |
478 | struct lowpan_dev_record *entry; | |
479 | int stat = NET_RX_SUCCESS; | |
480 | ||
481 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
482 | GFP_KERNEL); | |
483 | kfree_skb(skb); | |
484 | ||
485 | if (NULL == new) | |
486 | return -ENOMEM; | |
487 | ||
488 | skb_push(new, sizeof(struct ipv6hdr)); | |
489 | skb_reset_network_header(new); | |
490 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
491 | ||
492 | new->protocol = htons(ETH_P_IPV6); | |
493 | new->pkt_type = PACKET_HOST; | |
494 | ||
495 | rcu_read_lock(); | |
496 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
497 | if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) { | |
498 | skb = skb_copy(new, GFP_KERNEL); | |
499 | skb->dev = entry->ldev; | |
500 | ||
501 | if (in_interrupt()) | |
502 | stat = netif_rx(skb); | |
503 | else | |
504 | stat = netif_rx_ni(skb); | |
505 | } | |
506 | rcu_read_unlock(); | |
507 | ||
508 | kfree_skb(new); | |
509 | ||
510 | return stat; | |
511 | } | |
512 | ||
513 | static int | |
514 | lowpan_process_data(struct sk_buff *skb) | |
515 | { | |
516 | struct ipv6hdr hdr; | |
517 | u8 tmp, iphc0, iphc1, num_context = 0; | |
518 | u8 *_saddr, *_daddr; | |
519 | int err; | |
520 | ||
521 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
522 | skb->len); | |
523 | /* at least two bytes will be used for the encoding */ | |
524 | if (skb->len < 2) | |
525 | goto drop; | |
526 | iphc0 = lowpan_fetch_skb_u8(skb); | |
527 | iphc1 = lowpan_fetch_skb_u8(skb); | |
528 | ||
529 | _saddr = mac_cb(skb)->sa.hwaddr; | |
530 | _daddr = mac_cb(skb)->da.hwaddr; | |
531 | ||
532 | pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1); | |
533 | ||
534 | /* another if the CID flag is set */ | |
535 | if (iphc1 & LOWPAN_IPHC_CID) { | |
536 | pr_debug("(%s): CID flag is set, increase header with one\n", | |
537 | __func__); | |
538 | if (!skb->len) | |
539 | goto drop; | |
540 | num_context = lowpan_fetch_skb_u8(skb); | |
541 | } | |
542 | ||
543 | hdr.version = 6; | |
544 | ||
545 | /* Traffic Class and Flow Label */ | |
546 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
547 | /* | |
548 | * Traffic Class and FLow Label carried in-line | |
549 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
550 | */ | |
551 | case 0: /* 00b */ | |
552 | if (!skb->len) | |
553 | goto drop; | |
554 | tmp = lowpan_fetch_skb_u8(skb); | |
555 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); | |
556 | skb_pull(skb, 3); | |
557 | hdr.priority = ((tmp >> 2) & 0x0f); | |
558 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
559 | (hdr.flow_lbl[0] & 0x0f); | |
560 | break; | |
561 | /* | |
562 | * Traffic class carried in-line | |
563 | * ECN + DSCP (1 byte), Flow Label is elided | |
564 | */ | |
565 | case 1: /* 10b */ | |
566 | if (!skb->len) | |
567 | goto drop; | |
568 | tmp = lowpan_fetch_skb_u8(skb); | |
569 | hdr.priority = ((tmp >> 2) & 0x0f); | |
570 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
571 | hdr.flow_lbl[1] = 0; | |
572 | hdr.flow_lbl[2] = 0; | |
573 | break; | |
574 | /* | |
575 | * Flow Label carried in-line | |
576 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
577 | */ | |
578 | case 2: /* 01b */ | |
579 | if (!skb->len) | |
580 | goto drop; | |
581 | tmp = lowpan_fetch_skb_u8(skb); | |
582 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); | |
583 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
584 | skb_pull(skb, 2); | |
585 | break; | |
586 | /* Traffic Class and Flow Label are elided */ | |
587 | case 3: /* 11b */ | |
588 | hdr.priority = 0; | |
589 | hdr.flow_lbl[0] = 0; | |
590 | hdr.flow_lbl[1] = 0; | |
591 | hdr.flow_lbl[2] = 0; | |
592 | break; | |
593 | default: | |
594 | break; | |
595 | } | |
596 | ||
597 | /* Next Header */ | |
598 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
599 | /* Next header is carried inline */ | |
600 | if (!skb->len) | |
601 | goto drop; | |
602 | hdr.nexthdr = lowpan_fetch_skb_u8(skb); | |
603 | pr_debug("(%s): NH flag is set, next header is carried " | |
604 | "inline: %02x\n", __func__, hdr.nexthdr); | |
605 | } | |
606 | ||
607 | /* Hop Limit */ | |
608 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
609 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
610 | else { | |
611 | if (!skb->len) | |
612 | goto drop; | |
613 | hdr.hop_limit = lowpan_fetch_skb_u8(skb); | |
614 | } | |
615 | ||
616 | /* Extract SAM to the tmp variable */ | |
617 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
618 | ||
619 | /* Source address uncompression */ | |
620 | pr_debug("(%s): source address stateless compression\n", __func__); | |
621 | err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix, | |
622 | lowpan_unc_llconf[tmp], skb->data); | |
623 | if (err) | |
624 | goto drop; | |
625 | ||
626 | /* Extract DAM to the tmp variable */ | |
627 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
628 | ||
629 | /* check for Multicast Compression */ | |
630 | if (iphc1 & LOWPAN_IPHC_M) { | |
631 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
632 | pr_debug("(%s): destination address context-based " | |
633 | "multicast compression\n", __func__); | |
634 | /* TODO: implement this */ | |
635 | } else { | |
636 | u8 prefix[] = {0xff, 0x02}; | |
637 | ||
638 | pr_debug("(%s): destination address non-context-based" | |
639 | " multicast compression\n", __func__); | |
640 | if (0 < tmp && tmp < 3) { | |
641 | if (!skb->len) | |
642 | goto drop; | |
643 | else | |
644 | prefix[1] = lowpan_fetch_skb_u8(skb); | |
645 | } | |
646 | ||
647 | err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix, | |
648 | lowpan_unc_mxconf[tmp], NULL); | |
649 | if (err) | |
650 | goto drop; | |
651 | } | |
652 | } else { | |
653 | pr_debug("(%s): destination address stateless compression\n", | |
654 | __func__); | |
655 | err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, | |
656 | lowpan_unc_llconf[tmp], skb->data); | |
657 | if (err) | |
658 | goto drop; | |
659 | } | |
660 | ||
661 | /* TODO: UDP header parse */ | |
662 | ||
663 | /* Not fragmented package */ | |
664 | hdr.payload_len = htons(skb->len); | |
665 | ||
666 | pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__, | |
667 | skb_headroom(skb), skb->len); | |
668 | ||
669 | pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
670 | "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version, | |
671 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); | |
672 | ||
673 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
674 | sizeof(hdr)); | |
675 | return lowpan_skb_deliver(skb, &hdr); | |
676 | drop: | |
90d0963d | 677 | kfree_skb(skb); |
44331fe2 AS |
678 | return -EINVAL; |
679 | } | |
680 | ||
681 | static int lowpan_set_address(struct net_device *dev, void *p) | |
682 | { | |
683 | struct sockaddr *sa = p; | |
684 | ||
685 | if (netif_running(dev)) | |
686 | return -EBUSY; | |
687 | ||
688 | /* TODO: validate addr */ | |
689 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) | |
695 | { | |
696 | int err = 0; | |
697 | ||
698 | pr_debug("(%s): package xmit\n", __func__); | |
699 | ||
700 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
701 | if (skb->dev == NULL) { | |
702 | pr_debug("(%s) ERROR: no real wpan device found\n", __func__); | |
703 | dev_kfree_skb(skb); | |
704 | } else | |
705 | err = dev_queue_xmit(skb); | |
706 | ||
707 | return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK); | |
708 | } | |
709 | ||
710 | static void lowpan_dev_free(struct net_device *dev) | |
711 | { | |
712 | dev_put(lowpan_dev_info(dev)->real_dev); | |
713 | free_netdev(dev); | |
714 | } | |
715 | ||
716 | static struct header_ops lowpan_header_ops = { | |
717 | .create = lowpan_header_create, | |
718 | }; | |
719 | ||
720 | static const struct net_device_ops lowpan_netdev_ops = { | |
721 | .ndo_start_xmit = lowpan_xmit, | |
722 | .ndo_set_mac_address = lowpan_set_address, | |
723 | }; | |
724 | ||
725 | static void lowpan_setup(struct net_device *dev) | |
726 | { | |
727 | pr_debug("(%s)\n", __func__); | |
728 | ||
729 | dev->addr_len = IEEE802154_ADDR_LEN; | |
730 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
731 | dev->type = ARPHRD_IEEE802154; | |
732 | dev->features = NETIF_F_NO_CSUM; | |
733 | /* Frame Control + Sequence Number + Address fields + Security Header */ | |
734 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
735 | dev->needed_tailroom = 2; /* FCS */ | |
736 | dev->mtu = 1281; | |
737 | dev->tx_queue_len = 0; | |
738 | dev->flags = IFF_NOARP | IFF_BROADCAST; | |
739 | dev->watchdog_timeo = 0; | |
740 | ||
741 | dev->netdev_ops = &lowpan_netdev_ops; | |
742 | dev->header_ops = &lowpan_header_ops; | |
743 | dev->destructor = lowpan_dev_free; | |
744 | } | |
745 | ||
746 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
747 | { | |
748 | pr_debug("(%s)\n", __func__); | |
749 | ||
750 | if (tb[IFLA_ADDRESS]) { | |
751 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
752 | return -EINVAL; | |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
757 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
758 | struct packet_type *pt, struct net_device *orig_dev) | |
759 | { | |
760 | if (!netif_running(dev)) | |
761 | goto drop; | |
762 | ||
763 | if (dev->type != ARPHRD_IEEE802154) | |
764 | goto drop; | |
765 | ||
766 | /* check that it's our buffer */ | |
767 | if ((skb->data[0] & 0xe0) == 0x60) | |
768 | lowpan_process_data(skb); | |
769 | ||
770 | return NET_RX_SUCCESS; | |
771 | ||
772 | drop: | |
773 | kfree_skb(skb); | |
774 | return NET_RX_DROP; | |
775 | } | |
776 | ||
777 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
778 | struct nlattr *tb[], struct nlattr *data[]) | |
779 | { | |
780 | struct net_device *real_dev; | |
781 | struct lowpan_dev_record *entry; | |
782 | ||
783 | pr_debug("(%s)\n", __func__); | |
784 | ||
785 | if (!tb[IFLA_LINK]) | |
786 | return -EINVAL; | |
787 | /* find and hold real wpan device */ | |
788 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
789 | if (!real_dev) | |
790 | return -ENODEV; | |
791 | ||
792 | lowpan_dev_info(dev)->real_dev = real_dev; | |
793 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); | |
794 | ||
795 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); | |
796 | if (!entry) | |
797 | return -ENOMEM; | |
798 | ||
799 | entry->ldev = dev; | |
800 | ||
801 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
802 | INIT_LIST_HEAD(&entry->list); | |
803 | list_add_tail(&entry->list, &lowpan_devices); | |
804 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
805 | ||
806 | register_netdevice(dev); | |
807 | ||
808 | return 0; | |
809 | } | |
810 | ||
811 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
812 | { | |
813 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
814 | struct net_device *real_dev = lowpan_dev->real_dev; | |
815 | struct lowpan_dev_record *entry; | |
aec9db35 | 816 | struct lowpan_dev_record *tmp; |
44331fe2 AS |
817 | |
818 | ASSERT_RTNL(); | |
819 | ||
820 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
aec9db35 | 821 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
822 | if (entry->ldev == dev) { |
823 | list_del(&entry->list); | |
824 | kfree(entry); | |
825 | } | |
aec9db35 | 826 | } |
44331fe2 AS |
827 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
828 | ||
829 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
830 | ||
831 | unregister_netdevice_queue(dev, head); | |
832 | ||
833 | dev_put(real_dev); | |
834 | } | |
835 | ||
836 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
837 | .kind = "lowpan", | |
838 | .priv_size = sizeof(struct lowpan_dev_info), | |
839 | .setup = lowpan_setup, | |
840 | .newlink = lowpan_newlink, | |
841 | .dellink = lowpan_dellink, | |
842 | .validate = lowpan_validate, | |
843 | }; | |
844 | ||
845 | static inline int __init lowpan_netlink_init(void) | |
846 | { | |
847 | return rtnl_link_register(&lowpan_link_ops); | |
848 | } | |
849 | ||
850 | static inline void __init lowpan_netlink_fini(void) | |
851 | { | |
852 | rtnl_link_unregister(&lowpan_link_ops); | |
853 | } | |
854 | ||
855 | static struct packet_type lowpan_packet_type = { | |
856 | .type = __constant_htons(ETH_P_IEEE802154), | |
857 | .func = lowpan_rcv, | |
858 | }; | |
859 | ||
860 | static int __init lowpan_init_module(void) | |
861 | { | |
862 | int err = 0; | |
863 | ||
864 | pr_debug("(%s)\n", __func__); | |
865 | ||
866 | err = lowpan_netlink_init(); | |
867 | if (err < 0) | |
868 | goto out; | |
869 | ||
870 | dev_add_pack(&lowpan_packet_type); | |
871 | out: | |
872 | return err; | |
873 | } | |
874 | ||
875 | static void __exit lowpan_cleanup_module(void) | |
876 | { | |
877 | pr_debug("(%s)\n", __func__); | |
878 | ||
879 | lowpan_netlink_fini(); | |
880 | ||
881 | dev_remove_pack(&lowpan_packet_type); | |
882 | } | |
883 | ||
884 | module_init(lowpan_init_module); | |
885 | module_exit(lowpan_cleanup_module); | |
886 | MODULE_LICENSE("GPL"); | |
887 | MODULE_ALIAS_RTNL_LINK("lowpan"); |