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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> | |
cdf49c28 | 58 | #include <linux/etherdevice.h> |
44331fe2 AS |
59 | #include <net/af_ieee802154.h> |
60 | #include <net/ieee802154.h> | |
61 | #include <net/ieee802154_netdev.h> | |
62 | #include <net/ipv6.h> | |
63 | ||
64 | #include "6lowpan.h" | |
65 | ||
66 | /* TTL uncompression values */ | |
67 | static const u8 lowpan_ttl_values[] = {0, 1, 64, 255}; | |
68 | ||
69 | static LIST_HEAD(lowpan_devices); | |
70 | ||
71 | /* | |
72 | * Uncompression of linklocal: | |
73 | * 0 -> 16 bytes from packet | |
74 | * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet | |
75 | * 2 -> 2 bytes from prefix - zeroes + 2 from packet | |
76 | * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr | |
77 | * | |
78 | * NOTE: => the uncompress function does change 0xf to 0x10 | |
79 | * NOTE: 0x00 => no-autoconfig => unspecified | |
80 | */ | |
81 | static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20}; | |
82 | ||
83 | /* | |
84 | * Uncompression of ctx-based: | |
85 | * 0 -> 0 bits from packet [unspecified / reserved] | |
86 | * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet | |
87 | * 2 -> 8 bytes from prefix - zeroes + 2 from packet | |
88 | * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr | |
89 | */ | |
90 | static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80}; | |
91 | ||
92 | /* | |
93 | * Uncompression of ctx-base | |
94 | * 0 -> 0 bits from packet | |
95 | * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet | |
96 | * 2 -> 2 bytes from prefix - zeroes + 3 from packet | |
97 | * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr | |
98 | */ | |
99 | static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21}; | |
100 | ||
101 | /* Link local prefix */ | |
102 | static const u8 lowpan_llprefix[] = {0xfe, 0x80}; | |
103 | ||
104 | /* private device info */ | |
105 | struct lowpan_dev_info { | |
106 | struct net_device *real_dev; /* real WPAN device ptr */ | |
107 | struct mutex dev_list_mtx; /* mutex for list ops */ | |
108 | }; | |
109 | ||
110 | struct lowpan_dev_record { | |
111 | struct net_device *ldev; | |
112 | struct list_head list; | |
113 | }; | |
114 | ||
719269af | 115 | struct lowpan_fragment { |
116 | struct sk_buff *skb; /* skb to be assembled */ | |
117 | spinlock_t lock; /* concurency lock */ | |
118 | u16 length; /* length to be assemled */ | |
119 | u32 bytes_rcv; /* bytes received */ | |
120 | u16 tag; /* current fragment tag */ | |
121 | struct timer_list timer; /* assembling timer */ | |
122 | struct list_head list; /* fragments list */ | |
123 | }; | |
124 | ||
125 | static unsigned short fragment_tag; | |
126 | static LIST_HEAD(lowpan_fragments); | |
127 | spinlock_t flist_lock; | |
128 | ||
44331fe2 AS |
129 | static inline struct |
130 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
131 | { | |
132 | return netdev_priv(dev); | |
133 | } | |
134 | ||
135 | static inline void lowpan_address_flip(u8 *src, u8 *dest) | |
136 | { | |
137 | int i; | |
138 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) | |
139 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; | |
140 | } | |
141 | ||
142 | /* list of all 6lowpan devices, uses for package delivering */ | |
143 | /* print data in line */ | |
144 | static inline void lowpan_raw_dump_inline(const char *caller, char *msg, | |
145 | unsigned char *buf, int len) | |
146 | { | |
147 | #ifdef DEBUG | |
148 | if (msg) | |
149 | pr_debug("(%s) %s: ", caller, msg); | |
150 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, | |
151 | 16, 1, buf, len, false); | |
152 | #endif /* DEBUG */ | |
153 | } | |
154 | ||
155 | /* | |
156 | * print data in a table format: | |
157 | * | |
158 | * addr: xx xx xx xx xx xx | |
159 | * addr: xx xx xx xx xx xx | |
160 | * ... | |
161 | */ | |
162 | static inline void lowpan_raw_dump_table(const char *caller, char *msg, | |
163 | unsigned char *buf, int len) | |
164 | { | |
165 | #ifdef DEBUG | |
166 | if (msg) | |
167 | pr_debug("(%s) %s:\n", caller, msg); | |
168 | print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, | |
169 | 16, 1, buf, len, false); | |
170 | #endif /* DEBUG */ | |
171 | } | |
172 | ||
173 | static u8 | |
174 | lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr, | |
175 | const unsigned char *lladdr) | |
176 | { | |
177 | u8 val = 0; | |
178 | ||
179 | if (is_addr_mac_addr_based(ipaddr, lladdr)) | |
180 | val = 3; /* 0-bits */ | |
181 | else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
182 | /* compress IID to 16 bits xxxx::XXXX */ | |
183 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); | |
184 | *hc06_ptr += 2; | |
185 | val = 2; /* 16-bits */ | |
186 | } else { | |
187 | /* do not compress IID => xxxx::IID */ | |
188 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); | |
189 | *hc06_ptr += 8; | |
190 | val = 1; /* 64-bits */ | |
191 | } | |
192 | ||
193 | return rol8(val, shift); | |
194 | } | |
195 | ||
196 | static void | |
197 | lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr) | |
198 | { | |
2d319508 | 199 | memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN); |
44331fe2 AS |
200 | /* second bit-flip (Universe/Local) is done according RFC2464 */ |
201 | ipaddr->s6_addr[8] ^= 0x02; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Uncompress addresses based on a prefix and a postfix with zeroes in | |
206 | * between. If the postfix is zero in length it will use the link address | |
207 | * to configure the IP address (autoconf style). | |
208 | * pref_post_count takes a byte where the first nibble specify prefix count | |
209 | * and the second postfix count (NOTE: 15/0xf => 16 bytes copy). | |
210 | */ | |
211 | static int | |
212 | lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr, | |
213 | u8 const *prefix, u8 pref_post_count, unsigned char *lladdr) | |
214 | { | |
215 | u8 prefcount = pref_post_count >> 4; | |
216 | u8 postcount = pref_post_count & 0x0f; | |
217 | ||
218 | /* full nibble 15 => 16 */ | |
219 | prefcount = (prefcount == 15 ? 16 : prefcount); | |
220 | postcount = (postcount == 15 ? 16 : postcount); | |
221 | ||
222 | if (lladdr) | |
223 | lowpan_raw_dump_inline(__func__, "linklocal address", | |
2d319508 | 224 | lladdr, IEEE802154_ADDR_LEN); |
44331fe2 AS |
225 | if (prefcount > 0) |
226 | memcpy(ipaddr, prefix, prefcount); | |
227 | ||
228 | if (prefcount + postcount < 16) | |
229 | memset(&ipaddr->s6_addr[prefcount], 0, | |
230 | 16 - (prefcount + postcount)); | |
231 | ||
232 | if (postcount > 0) { | |
233 | memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount); | |
234 | skb_pull(skb, postcount); | |
235 | } else if (prefcount > 0) { | |
236 | if (lladdr == NULL) | |
237 | return -EINVAL; | |
238 | ||
239 | /* no IID based configuration if no prefix and no data */ | |
240 | lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr); | |
241 | } | |
242 | ||
243 | pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount, | |
244 | postcount); | |
245 | lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
3bd5b958 | 250 | static void |
251 | lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) | |
252 | { | |
253 | struct udphdr *uh = udp_hdr(skb); | |
254 | ||
255 | pr_debug("(%s): UDP header compression\n", __func__); | |
256 | ||
257 | if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) == | |
258 | LOWPAN_NHC_UDP_4BIT_PORT) && | |
259 | ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) == | |
260 | LOWPAN_NHC_UDP_4BIT_PORT)) { | |
261 | pr_debug("(%s): both ports compression to 4 bits\n", __func__); | |
262 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11; | |
263 | **(hc06_ptr + 1) = /* subtraction is faster */ | |
264 | (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) + | |
265 | ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4)); | |
266 | *hc06_ptr += 2; | |
267 | } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) == | |
268 | LOWPAN_NHC_UDP_8BIT_PORT) { | |
269 | pr_debug("(%s): remove 8 bits of dest\n", __func__); | |
270 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01; | |
271 | memcpy(*hc06_ptr + 1, &uh->source, 2); | |
272 | **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT); | |
273 | *hc06_ptr += 4; | |
274 | } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) == | |
275 | LOWPAN_NHC_UDP_8BIT_PORT) { | |
276 | pr_debug("(%s): remove 8 bits of source\n", __func__); | |
277 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10; | |
278 | memcpy(*hc06_ptr + 1, &uh->dest, 2); | |
279 | **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT); | |
280 | *hc06_ptr += 4; | |
281 | } else { | |
282 | pr_debug("(%s): can't compress header\n", __func__); | |
283 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00; | |
284 | memcpy(*hc06_ptr + 1, &uh->source, 2); | |
285 | memcpy(*hc06_ptr + 3, &uh->dest, 2); | |
286 | *hc06_ptr += 5; | |
287 | } | |
288 | ||
289 | /* checksum is always inline */ | |
290 | memcpy(*hc06_ptr, &uh->check, 2); | |
291 | *hc06_ptr += 2; | |
292 | } | |
293 | ||
c5d3687f | 294 | static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val) |
44331fe2 | 295 | { |
c5d3687f | 296 | if (unlikely(!pskb_may_pull(skb, 1))) |
297 | return -EINVAL; | |
44331fe2 | 298 | |
c5d3687f | 299 | *val = skb->data[0]; |
44331fe2 AS |
300 | skb_pull(skb, 1); |
301 | ||
c5d3687f | 302 | return 0; |
44331fe2 AS |
303 | } |
304 | ||
c5d3687f | 305 | static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val) |
719269af | 306 | { |
c5d3687f | 307 | if (unlikely(!pskb_may_pull(skb, 2))) |
308 | return -EINVAL; | |
719269af | 309 | |
c5d3687f | 310 | *val = skb->data[0] | (skb->data[1] << 8); |
719269af | 311 | skb_pull(skb, 2); |
c5d3687f | 312 | |
313 | return 0; | |
719269af | 314 | } |
315 | ||
f8b1b5d2 | 316 | static int |
317 | lowpan_uncompress_udp_header(struct sk_buff *skb) | |
318 | { | |
319 | struct udphdr *uh = udp_hdr(skb); | |
320 | u8 tmp; | |
321 | ||
c5d3687f | 322 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
323 | goto err; | |
f8b1b5d2 | 324 | |
325 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { | |
326 | pr_debug("(%s): UDP header uncompression\n", __func__); | |
327 | switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { | |
328 | case LOWPAN_NHC_UDP_CS_P_00: | |
329 | memcpy(&uh->source, &skb->data[0], 2); | |
330 | memcpy(&uh->dest, &skb->data[2], 2); | |
331 | skb_pull(skb, 4); | |
332 | break; | |
333 | case LOWPAN_NHC_UDP_CS_P_01: | |
334 | memcpy(&uh->source, &skb->data[0], 2); | |
335 | uh->dest = | |
336 | skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT; | |
337 | skb_pull(skb, 3); | |
338 | break; | |
339 | case LOWPAN_NHC_UDP_CS_P_10: | |
340 | uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT; | |
341 | memcpy(&uh->dest, &skb->data[1], 2); | |
342 | skb_pull(skb, 3); | |
343 | break; | |
344 | case LOWPAN_NHC_UDP_CS_P_11: | |
345 | uh->source = | |
346 | LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4); | |
347 | uh->dest = | |
348 | LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f); | |
349 | skb_pull(skb, 1); | |
350 | break; | |
351 | default: | |
352 | pr_debug("(%s) ERROR: unknown UDP format\n", __func__); | |
353 | goto err; | |
354 | break; | |
355 | } | |
356 | ||
357 | pr_debug("(%s): uncompressed UDP ports: src = %d, dst = %d\n", | |
358 | __func__, uh->source, uh->dest); | |
359 | ||
360 | /* copy checksum */ | |
361 | memcpy(&uh->check, &skb->data[0], 2); | |
362 | skb_pull(skb, 2); | |
363 | } else { | |
364 | pr_debug("(%s): ERROR: unsupported NH format\n", __func__); | |
365 | goto err; | |
366 | } | |
367 | ||
368 | return 0; | |
369 | err: | |
370 | return -EINVAL; | |
371 | } | |
372 | ||
44331fe2 AS |
373 | static int lowpan_header_create(struct sk_buff *skb, |
374 | struct net_device *dev, | |
375 | unsigned short type, const void *_daddr, | |
95c96174 | 376 | const void *_saddr, unsigned int len) |
44331fe2 AS |
377 | { |
378 | u8 tmp, iphc0, iphc1, *hc06_ptr; | |
379 | struct ipv6hdr *hdr; | |
380 | const u8 *saddr = _saddr; | |
381 | const u8 *daddr = _daddr; | |
382 | u8 *head; | |
383 | struct ieee802154_addr sa, da; | |
384 | ||
385 | if (type != ETH_P_IPV6) | |
386 | return 0; | |
387 | /* TODO: | |
388 | * if this package isn't ipv6 one, where should it be routed? | |
389 | */ | |
390 | head = kzalloc(100, GFP_KERNEL); | |
391 | if (head == NULL) | |
392 | return -ENOMEM; | |
393 | ||
394 | hdr = ipv6_hdr(skb); | |
395 | hc06_ptr = head + 2; | |
396 | ||
397 | pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
398 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__, | |
399 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, | |
400 | hdr->hop_limit); | |
401 | ||
402 | lowpan_raw_dump_table(__func__, "raw skb network header dump", | |
403 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
404 | ||
405 | if (!saddr) | |
406 | saddr = dev->dev_addr; | |
407 | ||
408 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
409 | ||
410 | /* | |
411 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
412 | * we sometimes use |= | |
413 | * If the field is 0, and the current bit value in memory is 1, | |
414 | * this does not work. We therefore reset the IPHC encoding here | |
415 | */ | |
416 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
417 | iphc1 = 0; | |
418 | ||
419 | /* TODO: context lookup */ | |
420 | ||
421 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
422 | ||
423 | /* | |
424 | * Traffic class, flow label | |
425 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
426 | * We have to process both in the same time as the offset of traffic | |
427 | * class depends on the presence of version and flow label | |
428 | */ | |
429 | ||
430 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
431 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
432 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
433 | ||
434 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
435 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
436 | /* flow label can be compressed */ | |
437 | iphc0 |= LOWPAN_IPHC_FL_C; | |
438 | if ((hdr->priority == 0) && | |
439 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
440 | /* compress (elide) all */ | |
441 | iphc0 |= LOWPAN_IPHC_TC_C; | |
442 | } else { | |
443 | /* compress only the flow label */ | |
444 | *hc06_ptr = tmp; | |
445 | hc06_ptr += 1; | |
446 | } | |
447 | } else { | |
448 | /* Flow label cannot be compressed */ | |
449 | if ((hdr->priority == 0) && | |
450 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
451 | /* compress only traffic class */ | |
452 | iphc0 |= LOWPAN_IPHC_TC_C; | |
453 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
454 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
455 | hc06_ptr += 3; | |
456 | } else { | |
457 | /* compress nothing */ | |
458 | memcpy(hc06_ptr, &hdr, 4); | |
459 | /* replace the top byte with new ECN | DSCP format */ | |
460 | *hc06_ptr = tmp; | |
461 | hc06_ptr += 4; | |
462 | } | |
463 | } | |
464 | ||
465 | /* NOTE: payload length is always compressed */ | |
466 | ||
467 | /* Next Header is compress if UDP */ | |
468 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
469 | iphc0 |= LOWPAN_IPHC_NH_C; | |
470 | ||
44331fe2 AS |
471 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { |
472 | *hc06_ptr = hdr->nexthdr; | |
473 | hc06_ptr += 1; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Hop limit | |
478 | * if 1: compress, encoding is 01 | |
479 | * if 64: compress, encoding is 10 | |
480 | * if 255: compress, encoding is 11 | |
481 | * else do not compress | |
482 | */ | |
483 | switch (hdr->hop_limit) { | |
484 | case 1: | |
485 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
486 | break; | |
487 | case 64: | |
488 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
489 | break; | |
490 | case 255: | |
491 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
492 | break; | |
493 | default: | |
494 | *hc06_ptr = hdr->hop_limit; | |
495 | break; | |
496 | } | |
497 | ||
498 | /* source address compression */ | |
499 | if (is_addr_unspecified(&hdr->saddr)) { | |
500 | pr_debug("(%s): source address is unspecified, setting SAC\n", | |
501 | __func__); | |
502 | iphc1 |= LOWPAN_IPHC_SAC; | |
503 | /* TODO: context lookup */ | |
504 | } else if (is_addr_link_local(&hdr->saddr)) { | |
505 | pr_debug("(%s): source address is link-local\n", __func__); | |
506 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
507 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); | |
508 | } else { | |
509 | pr_debug("(%s): send the full source address\n", __func__); | |
510 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); | |
511 | hc06_ptr += 16; | |
512 | } | |
513 | ||
514 | /* destination address compression */ | |
515 | if (is_addr_mcast(&hdr->daddr)) { | |
516 | pr_debug("(%s): destination address is multicast", __func__); | |
517 | iphc1 |= LOWPAN_IPHC_M; | |
518 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
519 | pr_debug("compressed to 1 octet\n"); | |
520 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
521 | /* use last byte */ | |
522 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
523 | hc06_ptr += 1; | |
524 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
525 | pr_debug("compressed to 4 octets\n"); | |
526 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
527 | /* second byte + the last three */ | |
528 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
529 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
530 | hc06_ptr += 4; | |
531 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
532 | pr_debug("compressed to 6 octets\n"); | |
533 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
534 | /* second byte + the last five */ | |
535 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
536 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
537 | hc06_ptr += 6; | |
538 | } else { | |
539 | pr_debug("using full address\n"); | |
540 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
541 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
542 | hc06_ptr += 16; | |
543 | } | |
544 | } else { | |
545 | pr_debug("(%s): destination address is unicast: ", __func__); | |
546 | /* TODO: context lookup */ | |
547 | if (is_addr_link_local(&hdr->daddr)) { | |
548 | pr_debug("destination address is link-local\n"); | |
549 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
550 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); | |
551 | } else { | |
552 | pr_debug("using full address\n"); | |
553 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); | |
554 | hc06_ptr += 16; | |
555 | } | |
556 | } | |
557 | ||
3bd5b958 | 558 | /* UDP header compression */ |
559 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
560 | lowpan_compress_udp_header(&hc06_ptr, skb); | |
44331fe2 AS |
561 | |
562 | head[0] = iphc0; | |
563 | head[1] = iphc1; | |
564 | ||
565 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
566 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
567 | ||
568 | kfree(head); | |
569 | ||
570 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
571 | skb->len); | |
572 | ||
573 | /* | |
574 | * NOTE1: I'm still unsure about the fact that compression and WPAN | |
575 | * header are created here and not later in the xmit. So wait for | |
576 | * an opinion of net maintainers. | |
577 | */ | |
578 | /* | |
579 | * NOTE2: to be absolutely correct, we must derive PANid information | |
580 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
581 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
582 | */ | |
583 | { | |
584 | /* prepare wpan address data */ | |
585 | sa.addr_type = IEEE802154_ADDR_LONG; | |
586 | sa.pan_id = 0xff; | |
587 | ||
588 | da.addr_type = IEEE802154_ADDR_LONG; | |
589 | da.pan_id = 0xff; | |
590 | ||
591 | memcpy(&(da.hwaddr), daddr, 8); | |
592 | memcpy(&(sa.hwaddr), saddr, 8); | |
593 | ||
594 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; | |
719269af | 595 | |
44331fe2 AS |
596 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
597 | type, (void *)&da, (void *)&sa, skb->len); | |
598 | } | |
599 | } | |
600 | ||
601 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) | |
602 | { | |
603 | struct sk_buff *new; | |
604 | struct lowpan_dev_record *entry; | |
605 | int stat = NET_RX_SUCCESS; | |
606 | ||
607 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
dcef1151 | 608 | GFP_ATOMIC); |
44331fe2 AS |
609 | kfree_skb(skb); |
610 | ||
dcef1151 | 611 | if (!new) |
44331fe2 AS |
612 | return -ENOMEM; |
613 | ||
614 | skb_push(new, sizeof(struct ipv6hdr)); | |
615 | skb_reset_network_header(new); | |
616 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
617 | ||
618 | new->protocol = htons(ETH_P_IPV6); | |
619 | new->pkt_type = PACKET_HOST; | |
620 | ||
621 | rcu_read_lock(); | |
622 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
623 | if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) { | |
dcef1151 | 624 | skb = skb_copy(new, GFP_ATOMIC); |
625 | if (!skb) { | |
626 | stat = -ENOMEM; | |
627 | break; | |
628 | } | |
44331fe2 | 629 | |
dcef1151 | 630 | skb->dev = entry->ldev; |
631 | stat = netif_rx(skb); | |
44331fe2 AS |
632 | } |
633 | rcu_read_unlock(); | |
634 | ||
635 | kfree_skb(new); | |
636 | ||
637 | return stat; | |
638 | } | |
639 | ||
719269af | 640 | static void lowpan_fragment_timer_expired(unsigned long entry_addr) |
641 | { | |
642 | struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; | |
643 | ||
644 | pr_debug("%s: timer expired for frame with tag %d\n", __func__, | |
645 | entry->tag); | |
646 | ||
647 | spin_lock(&flist_lock); | |
648 | list_del(&entry->list); | |
649 | spin_unlock(&flist_lock); | |
650 | ||
651 | dev_kfree_skb(entry->skb); | |
652 | kfree(entry); | |
653 | } | |
654 | ||
c2e94d73 | 655 | static struct lowpan_fragment * |
656 | lowpan_alloc_new_frame(struct sk_buff *skb, u8 iphc0, u8 len, u8 tag) | |
657 | { | |
658 | struct lowpan_fragment *frame; | |
659 | ||
660 | frame = kzalloc(sizeof(struct lowpan_fragment), | |
661 | GFP_ATOMIC); | |
662 | if (!frame) | |
663 | goto frame_err; | |
664 | ||
665 | INIT_LIST_HEAD(&frame->list); | |
666 | ||
667 | frame->length = (iphc0 & 7) | (len << 3); | |
668 | frame->tag = tag; | |
669 | ||
670 | /* allocate buffer for frame assembling */ | |
671 | frame->skb = alloc_skb(frame->length + | |
672 | sizeof(struct ipv6hdr), GFP_ATOMIC); | |
673 | ||
674 | if (!frame->skb) | |
675 | goto skb_err; | |
676 | ||
677 | frame->skb->priority = skb->priority; | |
678 | frame->skb->dev = skb->dev; | |
679 | ||
680 | /* reserve headroom for uncompressed ipv6 header */ | |
681 | skb_reserve(frame->skb, sizeof(struct ipv6hdr)); | |
682 | skb_put(frame->skb, frame->length); | |
683 | ||
684 | init_timer(&frame->timer); | |
685 | /* time out is the same as for ipv6 - 60 sec */ | |
686 | frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; | |
687 | frame->timer.data = (unsigned long)frame; | |
688 | frame->timer.function = lowpan_fragment_timer_expired; | |
689 | ||
690 | add_timer(&frame->timer); | |
691 | ||
692 | list_add_tail(&frame->list, &lowpan_fragments); | |
693 | ||
694 | return frame; | |
695 | ||
696 | skb_err: | |
697 | kfree(frame); | |
698 | frame_err: | |
699 | return NULL; | |
700 | } | |
701 | ||
44331fe2 AS |
702 | static int |
703 | lowpan_process_data(struct sk_buff *skb) | |
704 | { | |
705 | struct ipv6hdr hdr; | |
706 | u8 tmp, iphc0, iphc1, num_context = 0; | |
707 | u8 *_saddr, *_daddr; | |
708 | int err; | |
709 | ||
710 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
711 | skb->len); | |
712 | /* at least two bytes will be used for the encoding */ | |
713 | if (skb->len < 2) | |
714 | goto drop; | |
c5d3687f | 715 | |
716 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
717 | goto drop; | |
719269af | 718 | |
719 | /* fragments assembling */ | |
720 | switch (iphc0 & LOWPAN_DISPATCH_MASK) { | |
721 | case LOWPAN_DISPATCH_FRAG1: | |
722 | case LOWPAN_DISPATCH_FRAGN: | |
723 | { | |
724 | struct lowpan_fragment *frame; | |
725 | u8 len, offset; | |
726 | u16 tag; | |
727 | bool found = false; | |
728 | ||
c5d3687f | 729 | if (lowpan_fetch_skb_u8(skb, &len) || /* frame length */ |
730 | lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */ | |
731 | goto drop; | |
719269af | 732 | |
733 | /* | |
734 | * check if frame assembling with the same tag is | |
735 | * already in progress | |
736 | */ | |
737 | spin_lock(&flist_lock); | |
738 | ||
739 | list_for_each_entry(frame, &lowpan_fragments, list) | |
740 | if (frame->tag == tag) { | |
741 | found = true; | |
742 | break; | |
743 | } | |
744 | ||
745 | /* alloc new frame structure */ | |
746 | if (!found) { | |
c2e94d73 | 747 | frame = lowpan_alloc_new_frame(skb, iphc0, len, tag); |
719269af | 748 | if (!frame) |
749 | goto unlock_and_drop; | |
719269af | 750 | } |
751 | ||
752 | if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) | |
753 | goto unlock_and_drop; | |
754 | ||
c5d3687f | 755 | if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */ |
756 | goto unlock_and_drop; | |
719269af | 757 | |
758 | /* if payload fits buffer, copy it */ | |
759 | if (likely((offset * 8 + skb->len) <= frame->length)) | |
760 | skb_copy_to_linear_data_offset(frame->skb, offset * 8, | |
761 | skb->data, skb->len); | |
762 | else | |
763 | goto unlock_and_drop; | |
764 | ||
765 | frame->bytes_rcv += skb->len; | |
766 | ||
767 | /* frame assembling complete */ | |
768 | if ((frame->bytes_rcv == frame->length) && | |
769 | frame->timer.expires > jiffies) { | |
770 | /* if timer haven't expired - first of all delete it */ | |
771 | del_timer(&frame->timer); | |
772 | list_del(&frame->list); | |
773 | spin_unlock(&flist_lock); | |
774 | ||
775 | dev_kfree_skb(skb); | |
776 | skb = frame->skb; | |
777 | kfree(frame); | |
c5d3687f | 778 | |
779 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
780 | goto unlock_and_drop; | |
781 | ||
719269af | 782 | break; |
783 | } | |
784 | spin_unlock(&flist_lock); | |
785 | ||
786 | return kfree_skb(skb), 0; | |
787 | } | |
788 | default: | |
789 | break; | |
790 | } | |
791 | ||
c5d3687f | 792 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
793 | goto drop; | |
44331fe2 AS |
794 | |
795 | _saddr = mac_cb(skb)->sa.hwaddr; | |
796 | _daddr = mac_cb(skb)->da.hwaddr; | |
797 | ||
798 | pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1); | |
799 | ||
800 | /* another if the CID flag is set */ | |
801 | if (iphc1 & LOWPAN_IPHC_CID) { | |
802 | pr_debug("(%s): CID flag is set, increase header with one\n", | |
803 | __func__); | |
c5d3687f | 804 | if (lowpan_fetch_skb_u8(skb, &num_context)) |
44331fe2 | 805 | goto drop; |
44331fe2 AS |
806 | } |
807 | ||
808 | hdr.version = 6; | |
809 | ||
810 | /* Traffic Class and Flow Label */ | |
811 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
812 | /* | |
813 | * Traffic Class and FLow Label carried in-line | |
814 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
815 | */ | |
816 | case 0: /* 00b */ | |
c5d3687f | 817 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 818 | goto drop; |
c5d3687f | 819 | |
44331fe2 AS |
820 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); |
821 | skb_pull(skb, 3); | |
822 | hdr.priority = ((tmp >> 2) & 0x0f); | |
823 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
824 | (hdr.flow_lbl[0] & 0x0f); | |
825 | break; | |
826 | /* | |
827 | * Traffic class carried in-line | |
828 | * ECN + DSCP (1 byte), Flow Label is elided | |
829 | */ | |
830 | case 1: /* 10b */ | |
c5d3687f | 831 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 832 | goto drop; |
c5d3687f | 833 | |
44331fe2 AS |
834 | hdr.priority = ((tmp >> 2) & 0x0f); |
835 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
836 | hdr.flow_lbl[1] = 0; | |
837 | hdr.flow_lbl[2] = 0; | |
838 | break; | |
839 | /* | |
840 | * Flow Label carried in-line | |
841 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
842 | */ | |
843 | case 2: /* 01b */ | |
c5d3687f | 844 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 845 | goto drop; |
c5d3687f | 846 | |
44331fe2 AS |
847 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); |
848 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
849 | skb_pull(skb, 2); | |
850 | break; | |
851 | /* Traffic Class and Flow Label are elided */ | |
852 | case 3: /* 11b */ | |
853 | hdr.priority = 0; | |
854 | hdr.flow_lbl[0] = 0; | |
855 | hdr.flow_lbl[1] = 0; | |
856 | hdr.flow_lbl[2] = 0; | |
857 | break; | |
858 | default: | |
859 | break; | |
860 | } | |
861 | ||
862 | /* Next Header */ | |
863 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
864 | /* Next header is carried inline */ | |
c5d3687f | 865 | if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr))) |
44331fe2 | 866 | goto drop; |
c5d3687f | 867 | |
44331fe2 AS |
868 | pr_debug("(%s): NH flag is set, next header is carried " |
869 | "inline: %02x\n", __func__, hdr.nexthdr); | |
870 | } | |
871 | ||
872 | /* Hop Limit */ | |
873 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
874 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
875 | else { | |
c5d3687f | 876 | if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit))) |
44331fe2 | 877 | goto drop; |
44331fe2 AS |
878 | } |
879 | ||
880 | /* Extract SAM to the tmp variable */ | |
881 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
882 | ||
883 | /* Source address uncompression */ | |
884 | pr_debug("(%s): source address stateless compression\n", __func__); | |
885 | err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix, | |
886 | lowpan_unc_llconf[tmp], skb->data); | |
887 | if (err) | |
888 | goto drop; | |
889 | ||
890 | /* Extract DAM to the tmp variable */ | |
891 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
892 | ||
893 | /* check for Multicast Compression */ | |
894 | if (iphc1 & LOWPAN_IPHC_M) { | |
895 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
896 | pr_debug("(%s): destination address context-based " | |
897 | "multicast compression\n", __func__); | |
898 | /* TODO: implement this */ | |
899 | } else { | |
900 | u8 prefix[] = {0xff, 0x02}; | |
901 | ||
902 | pr_debug("(%s): destination address non-context-based" | |
903 | " multicast compression\n", __func__); | |
904 | if (0 < tmp && tmp < 3) { | |
c5d3687f | 905 | if (lowpan_fetch_skb_u8(skb, &prefix[1])) |
44331fe2 | 906 | goto drop; |
44331fe2 AS |
907 | } |
908 | ||
909 | err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix, | |
910 | lowpan_unc_mxconf[tmp], NULL); | |
911 | if (err) | |
912 | goto drop; | |
913 | } | |
914 | } else { | |
915 | pr_debug("(%s): destination address stateless compression\n", | |
916 | __func__); | |
917 | err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, | |
918 | lowpan_unc_llconf[tmp], skb->data); | |
919 | if (err) | |
920 | goto drop; | |
921 | } | |
922 | ||
f8b1b5d2 | 923 | /* UDP data uncompression */ |
924 | if (iphc0 & LOWPAN_IPHC_NH_C) | |
925 | if (lowpan_uncompress_udp_header(skb)) | |
926 | goto drop; | |
44331fe2 AS |
927 | |
928 | /* Not fragmented package */ | |
929 | hdr.payload_len = htons(skb->len); | |
930 | ||
931 | pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__, | |
932 | skb_headroom(skb), skb->len); | |
933 | ||
934 | pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
935 | "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version, | |
936 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); | |
937 | ||
938 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
939 | sizeof(hdr)); | |
940 | return lowpan_skb_deliver(skb, &hdr); | |
719269af | 941 | |
942 | unlock_and_drop: | |
943 | spin_unlock(&flist_lock); | |
44331fe2 | 944 | drop: |
90d0963d | 945 | kfree_skb(skb); |
44331fe2 AS |
946 | return -EINVAL; |
947 | } | |
948 | ||
719269af | 949 | static int lowpan_get_mac_header_length(struct sk_buff *skb) |
950 | { | |
951 | /* | |
952 | * Currently long addressing mode is supported only, so the overall | |
953 | * header size is 21: | |
954 | * FC SeqNum DPAN DA SA Sec | |
955 | * 2 + 1 + 2 + 8 + 8 + 0 = 21 | |
956 | */ | |
957 | return 21; | |
958 | } | |
959 | ||
960 | static int | |
961 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, | |
962 | int mlen, int plen, int offset) | |
963 | { | |
964 | struct sk_buff *frag; | |
965 | int hlen, ret; | |
966 | ||
967 | /* if payload length is zero, therefore it's a first fragment */ | |
968 | hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE); | |
969 | ||
970 | lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); | |
971 | ||
972 | frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE); | |
973 | if (!frag) | |
974 | return -ENOMEM; | |
975 | ||
976 | frag->priority = skb->priority; | |
977 | frag->dev = skb->dev; | |
978 | ||
979 | /* copy header, MFR and payload */ | |
980 | memcpy(skb_put(frag, mlen), skb->data, mlen); | |
981 | memcpy(skb_put(frag, hlen), head, hlen); | |
982 | ||
983 | if (plen) | |
984 | skb_copy_from_linear_data_offset(skb, offset + mlen, | |
985 | skb_put(frag, plen), plen); | |
986 | ||
987 | lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, | |
988 | frag->len); | |
989 | ||
990 | ret = dev_queue_xmit(frag); | |
991 | ||
719269af | 992 | return ret; |
993 | } | |
994 | ||
995 | static int | |
996 | lowpan_skb_fragmentation(struct sk_buff *skb) | |
997 | { | |
998 | int err, header_length, payload_length, tag, offset = 0; | |
999 | u8 head[5]; | |
1000 | ||
1001 | header_length = lowpan_get_mac_header_length(skb); | |
1002 | payload_length = skb->len - header_length; | |
1003 | tag = fragment_tag++; | |
1004 | ||
1005 | /* first fragment header */ | |
1006 | head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7); | |
1007 | head[1] = (payload_length >> 3) & 0xff; | |
1008 | head[2] = tag & 0xff; | |
1009 | head[3] = tag >> 8; | |
1010 | ||
1011 | err = lowpan_fragment_xmit(skb, head, header_length, 0, 0); | |
1012 | ||
1013 | /* next fragment header */ | |
1014 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
1015 | head[0] |= LOWPAN_DISPATCH_FRAGN; | |
1016 | ||
1017 | while ((payload_length - offset > 0) && (err >= 0)) { | |
1018 | int len = LOWPAN_FRAG_SIZE; | |
1019 | ||
1020 | head[4] = offset / 8; | |
1021 | ||
1022 | if (payload_length - offset < len) | |
1023 | len = payload_length - offset; | |
1024 | ||
1025 | err = lowpan_fragment_xmit(skb, head, header_length, | |
1026 | len, offset); | |
1027 | offset += len; | |
1028 | } | |
1029 | ||
1030 | return err; | |
1031 | } | |
1032 | ||
44331fe2 AS |
1033 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
1034 | { | |
719269af | 1035 | int err = -1; |
44331fe2 AS |
1036 | |
1037 | pr_debug("(%s): package xmit\n", __func__); | |
1038 | ||
1039 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
1040 | if (skb->dev == NULL) { | |
1041 | pr_debug("(%s) ERROR: no real wpan device found\n", __func__); | |
719269af | 1042 | goto error; |
1043 | } | |
1044 | ||
1045 | if (skb->len <= IEEE802154_MTU) { | |
44331fe2 | 1046 | err = dev_queue_xmit(skb); |
719269af | 1047 | goto out; |
1048 | } | |
1049 | ||
1050 | pr_debug("(%s): frame is too big, fragmentation is needed\n", | |
1051 | __func__); | |
1052 | err = lowpan_skb_fragmentation(skb); | |
1053 | error: | |
1054 | dev_kfree_skb(skb); | |
1055 | out: | |
1056 | if (err < 0) | |
1057 | pr_debug("(%s): ERROR: xmit failed\n", __func__); | |
44331fe2 AS |
1058 | |
1059 | return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK); | |
1060 | } | |
1061 | ||
1062 | static void lowpan_dev_free(struct net_device *dev) | |
1063 | { | |
1064 | dev_put(lowpan_dev_info(dev)->real_dev); | |
1065 | free_netdev(dev); | |
1066 | } | |
1067 | ||
0848e404 | 1068 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
1069 | { | |
1070 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1071 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); | |
1072 | } | |
1073 | ||
1074 | static u16 lowpan_get_pan_id(const struct net_device *dev) | |
1075 | { | |
1076 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1077 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); | |
1078 | } | |
1079 | ||
1080 | static u16 lowpan_get_short_addr(const struct net_device *dev) | |
1081 | { | |
1082 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1083 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); | |
1084 | } | |
1085 | ||
44331fe2 AS |
1086 | static struct header_ops lowpan_header_ops = { |
1087 | .create = lowpan_header_create, | |
1088 | }; | |
1089 | ||
1090 | static const struct net_device_ops lowpan_netdev_ops = { | |
1091 | .ndo_start_xmit = lowpan_xmit, | |
cdf49c28 | 1092 | .ndo_set_mac_address = eth_mac_addr, |
44331fe2 AS |
1093 | }; |
1094 | ||
0848e404 | 1095 | static struct ieee802154_mlme_ops lowpan_mlme = { |
1096 | .get_pan_id = lowpan_get_pan_id, | |
1097 | .get_phy = lowpan_get_phy, | |
1098 | .get_short_addr = lowpan_get_short_addr, | |
1099 | }; | |
1100 | ||
44331fe2 AS |
1101 | static void lowpan_setup(struct net_device *dev) |
1102 | { | |
1103 | pr_debug("(%s)\n", __func__); | |
1104 | ||
1105 | dev->addr_len = IEEE802154_ADDR_LEN; | |
1106 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
1107 | dev->type = ARPHRD_IEEE802154; | |
44331fe2 AS |
1108 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
1109 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
1110 | dev->needed_tailroom = 2; /* FCS */ | |
1111 | dev->mtu = 1281; | |
1112 | dev->tx_queue_len = 0; | |
4d039f68 | 1113 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
44331fe2 AS |
1114 | dev->watchdog_timeo = 0; |
1115 | ||
1116 | dev->netdev_ops = &lowpan_netdev_ops; | |
1117 | dev->header_ops = &lowpan_header_ops; | |
0848e404 | 1118 | dev->ml_priv = &lowpan_mlme; |
44331fe2 AS |
1119 | dev->destructor = lowpan_dev_free; |
1120 | } | |
1121 | ||
1122 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1123 | { | |
1124 | pr_debug("(%s)\n", __func__); | |
1125 | ||
1126 | if (tb[IFLA_ADDRESS]) { | |
1127 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
1128 | return -EINVAL; | |
1129 | } | |
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
1134 | struct packet_type *pt, struct net_device *orig_dev) | |
1135 | { | |
1136 | if (!netif_running(dev)) | |
1137 | goto drop; | |
1138 | ||
1139 | if (dev->type != ARPHRD_IEEE802154) | |
1140 | goto drop; | |
1141 | ||
1142 | /* check that it's our buffer */ | |
719269af | 1143 | switch (skb->data[0] & 0xe0) { |
1144 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
1145 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ | |
1146 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ | |
44331fe2 | 1147 | lowpan_process_data(skb); |
719269af | 1148 | break; |
1149 | default: | |
1150 | break; | |
1151 | } | |
44331fe2 AS |
1152 | |
1153 | return NET_RX_SUCCESS; | |
1154 | ||
1155 | drop: | |
1156 | kfree_skb(skb); | |
1157 | return NET_RX_DROP; | |
1158 | } | |
1159 | ||
1160 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
1161 | struct nlattr *tb[], struct nlattr *data[]) | |
1162 | { | |
1163 | struct net_device *real_dev; | |
1164 | struct lowpan_dev_record *entry; | |
1165 | ||
1166 | pr_debug("(%s)\n", __func__); | |
1167 | ||
1168 | if (!tb[IFLA_LINK]) | |
1169 | return -EINVAL; | |
1170 | /* find and hold real wpan device */ | |
1171 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
1172 | if (!real_dev) | |
1173 | return -ENODEV; | |
1174 | ||
1175 | lowpan_dev_info(dev)->real_dev = real_dev; | |
1176 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); | |
1177 | ||
1178 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); | |
dc00fd44 DC |
1179 | if (!entry) { |
1180 | dev_put(real_dev); | |
1181 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 1182 | return -ENOMEM; |
dc00fd44 | 1183 | } |
44331fe2 AS |
1184 | |
1185 | entry->ldev = dev; | |
1186 | ||
1187 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1188 | INIT_LIST_HEAD(&entry->list); | |
1189 | list_add_tail(&entry->list, &lowpan_devices); | |
1190 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1191 | ||
768f7c7c | 1192 | spin_lock_init(&flist_lock); |
1193 | ||
44331fe2 AS |
1194 | register_netdevice(dev); |
1195 | ||
1196 | return 0; | |
1197 | } | |
1198 | ||
1199 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
1200 | { | |
1201 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
1202 | struct net_device *real_dev = lowpan_dev->real_dev; | |
8deff4af | 1203 | struct lowpan_dev_record *entry, *tmp; |
1204 | struct lowpan_fragment *frame, *tframe; | |
44331fe2 AS |
1205 | |
1206 | ASSERT_RTNL(); | |
1207 | ||
8deff4af | 1208 | spin_lock(&flist_lock); |
1209 | list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) { | |
1210 | del_timer(&frame->timer); | |
1211 | list_del(&frame->list); | |
1212 | dev_kfree_skb(frame->skb); | |
1213 | kfree(frame); | |
1214 | } | |
1215 | spin_unlock(&flist_lock); | |
1216 | ||
44331fe2 | 1217 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
aec9db35 | 1218 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
1219 | if (entry->ldev == dev) { |
1220 | list_del(&entry->list); | |
1221 | kfree(entry); | |
1222 | } | |
aec9db35 | 1223 | } |
44331fe2 AS |
1224 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
1225 | ||
1226 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
1227 | ||
1228 | unregister_netdevice_queue(dev, head); | |
1229 | ||
1230 | dev_put(real_dev); | |
1231 | } | |
1232 | ||
1233 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
1234 | .kind = "lowpan", | |
1235 | .priv_size = sizeof(struct lowpan_dev_info), | |
1236 | .setup = lowpan_setup, | |
1237 | .newlink = lowpan_newlink, | |
1238 | .dellink = lowpan_dellink, | |
1239 | .validate = lowpan_validate, | |
1240 | }; | |
1241 | ||
1242 | static inline int __init lowpan_netlink_init(void) | |
1243 | { | |
1244 | return rtnl_link_register(&lowpan_link_ops); | |
1245 | } | |
1246 | ||
1247 | static inline void __init lowpan_netlink_fini(void) | |
1248 | { | |
1249 | rtnl_link_unregister(&lowpan_link_ops); | |
1250 | } | |
1251 | ||
1252 | static struct packet_type lowpan_packet_type = { | |
1253 | .type = __constant_htons(ETH_P_IEEE802154), | |
1254 | .func = lowpan_rcv, | |
1255 | }; | |
1256 | ||
1257 | static int __init lowpan_init_module(void) | |
1258 | { | |
1259 | int err = 0; | |
1260 | ||
1261 | pr_debug("(%s)\n", __func__); | |
1262 | ||
1263 | err = lowpan_netlink_init(); | |
1264 | if (err < 0) | |
1265 | goto out; | |
1266 | ||
1267 | dev_add_pack(&lowpan_packet_type); | |
1268 | out: | |
1269 | return err; | |
1270 | } | |
1271 | ||
1272 | static void __exit lowpan_cleanup_module(void) | |
1273 | { | |
1274 | pr_debug("(%s)\n", __func__); | |
1275 | ||
1276 | lowpan_netlink_fini(); | |
1277 | ||
1278 | dev_remove_pack(&lowpan_packet_type); | |
1279 | } | |
1280 | ||
1281 | module_init(lowpan_init_module); | |
1282 | module_exit(lowpan_cleanup_module); | |
1283 | MODULE_LICENSE("GPL"); | |
1284 | MODULE_ALIAS_RTNL_LINK("lowpan"); |