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