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44331fe2 AS |
1 | /* |
2 | * Copyright 2011, Siemens AG | |
3 | * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
4 | */ | |
5 | ||
6 | /* | |
7 | * Based on patches from Jon Smirl <jonsmirl@gmail.com> | |
8 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 | |
12 | * as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | */ | |
23 | ||
24 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
25 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
26 | * All rights reserved. | |
27 | * | |
28 | * Redistribution and use in source and binary forms, with or without | |
29 | * modification, are permitted provided that the following conditions | |
30 | * are met: | |
31 | * 1. Redistributions of source code must retain the above copyright | |
32 | * notice, this list of conditions and the following disclaimer. | |
33 | * 2. Redistributions in binary form must reproduce the above copyright | |
34 | * notice, this list of conditions and the following disclaimer in the | |
35 | * documentation and/or other materials provided with the distribution. | |
36 | * 3. Neither the name of the Institute nor the names of its contributors | |
37 | * may be used to endorse or promote products derived from this software | |
38 | * without specific prior written permission. | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
51 | */ | |
52 | ||
44331fe2 AS |
53 | #include <linux/bitops.h> |
54 | #include <linux/if_arp.h> | |
55 | #include <linux/module.h> | |
56 | #include <linux/moduleparam.h> | |
57 | #include <linux/netdevice.h> | |
58 | #include <net/af_ieee802154.h> | |
59 | #include <net/ieee802154.h> | |
60 | #include <net/ieee802154_netdev.h> | |
61 | #include <net/ipv6.h> | |
62 | ||
63 | #include "6lowpan.h" | |
64 | ||
65 | /* TTL uncompression values */ | |
66 | static const u8 lowpan_ttl_values[] = {0, 1, 64, 255}; | |
67 | ||
68 | static LIST_HEAD(lowpan_devices); | |
69 | ||
70 | /* | |
71 | * Uncompression of linklocal: | |
72 | * 0 -> 16 bytes from packet | |
73 | * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet | |
74 | * 2 -> 2 bytes from prefix - zeroes + 2 from packet | |
75 | * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr | |
76 | * | |
77 | * NOTE: => the uncompress function does change 0xf to 0x10 | |
78 | * NOTE: 0x00 => no-autoconfig => unspecified | |
79 | */ | |
80 | static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20}; | |
81 | ||
82 | /* | |
83 | * Uncompression of ctx-based: | |
84 | * 0 -> 0 bits from packet [unspecified / reserved] | |
85 | * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet | |
86 | * 2 -> 8 bytes from prefix - zeroes + 2 from packet | |
87 | * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr | |
88 | */ | |
89 | static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80}; | |
90 | ||
91 | /* | |
92 | * Uncompression of ctx-base | |
93 | * 0 -> 0 bits from packet | |
94 | * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet | |
95 | * 2 -> 2 bytes from prefix - zeroes + 3 from packet | |
96 | * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr | |
97 | */ | |
98 | static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21}; | |
99 | ||
100 | /* Link local prefix */ | |
101 | static const u8 lowpan_llprefix[] = {0xfe, 0x80}; | |
102 | ||
103 | /* private device info */ | |
104 | struct lowpan_dev_info { | |
105 | struct net_device *real_dev; /* real WPAN device ptr */ | |
106 | struct mutex dev_list_mtx; /* mutex for list ops */ | |
107 | }; | |
108 | ||
109 | struct lowpan_dev_record { | |
110 | struct net_device *ldev; | |
111 | struct list_head list; | |
112 | }; | |
113 | ||
719269af | 114 | struct lowpan_fragment { |
115 | struct sk_buff *skb; /* skb to be assembled */ | |
719269af | 116 | u16 length; /* length to be assemled */ |
117 | u32 bytes_rcv; /* bytes received */ | |
118 | u16 tag; /* current fragment tag */ | |
119 | struct timer_list timer; /* assembling timer */ | |
120 | struct list_head list; /* fragments list */ | |
121 | }; | |
122 | ||
123 | static unsigned short fragment_tag; | |
124 | static LIST_HEAD(lowpan_fragments); | |
4d27de14 | 125 | static DEFINE_SPINLOCK(flist_lock); |
719269af | 126 | |
44331fe2 AS |
127 | static inline struct |
128 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
129 | { | |
130 | return netdev_priv(dev); | |
131 | } | |
132 | ||
133 | static inline void lowpan_address_flip(u8 *src, u8 *dest) | |
134 | { | |
135 | int i; | |
136 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) | |
137 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; | |
138 | } | |
139 | ||
140 | /* list of all 6lowpan devices, uses for package delivering */ | |
141 | /* print data in line */ | |
142 | static inline void lowpan_raw_dump_inline(const char *caller, char *msg, | |
143 | unsigned char *buf, int len) | |
144 | { | |
145 | #ifdef DEBUG | |
146 | if (msg) | |
147 | pr_debug("(%s) %s: ", caller, msg); | |
148 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, | |
149 | 16, 1, buf, len, false); | |
150 | #endif /* DEBUG */ | |
151 | } | |
152 | ||
153 | /* | |
154 | * print data in a table format: | |
155 | * | |
156 | * addr: xx xx xx xx xx xx | |
157 | * addr: xx xx xx xx xx xx | |
158 | * ... | |
159 | */ | |
160 | static inline void lowpan_raw_dump_table(const char *caller, char *msg, | |
161 | unsigned char *buf, int len) | |
162 | { | |
163 | #ifdef DEBUG | |
164 | if (msg) | |
165 | pr_debug("(%s) %s:\n", caller, msg); | |
166 | print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, | |
167 | 16, 1, buf, len, false); | |
168 | #endif /* DEBUG */ | |
169 | } | |
170 | ||
171 | static u8 | |
172 | lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr, | |
173 | const unsigned char *lladdr) | |
174 | { | |
175 | u8 val = 0; | |
176 | ||
177 | if (is_addr_mac_addr_based(ipaddr, lladdr)) | |
178 | val = 3; /* 0-bits */ | |
179 | else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
180 | /* compress IID to 16 bits xxxx::XXXX */ | |
181 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); | |
182 | *hc06_ptr += 2; | |
183 | val = 2; /* 16-bits */ | |
184 | } else { | |
185 | /* do not compress IID => xxxx::IID */ | |
186 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); | |
187 | *hc06_ptr += 8; | |
188 | val = 1; /* 64-bits */ | |
189 | } | |
190 | ||
191 | return rol8(val, shift); | |
192 | } | |
193 | ||
194 | static void | |
195 | lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr) | |
196 | { | |
2d319508 | 197 | memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN); |
44331fe2 AS |
198 | /* second bit-flip (Universe/Local) is done according RFC2464 */ |
199 | ipaddr->s6_addr[8] ^= 0x02; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Uncompress addresses based on a prefix and a postfix with zeroes in | |
204 | * between. If the postfix is zero in length it will use the link address | |
205 | * to configure the IP address (autoconf style). | |
206 | * pref_post_count takes a byte where the first nibble specify prefix count | |
207 | * and the second postfix count (NOTE: 15/0xf => 16 bytes copy). | |
208 | */ | |
209 | static int | |
210 | lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr, | |
211 | u8 const *prefix, u8 pref_post_count, unsigned char *lladdr) | |
212 | { | |
213 | u8 prefcount = pref_post_count >> 4; | |
214 | u8 postcount = pref_post_count & 0x0f; | |
215 | ||
216 | /* full nibble 15 => 16 */ | |
217 | prefcount = (prefcount == 15 ? 16 : prefcount); | |
218 | postcount = (postcount == 15 ? 16 : postcount); | |
219 | ||
220 | if (lladdr) | |
221 | lowpan_raw_dump_inline(__func__, "linklocal address", | |
2d319508 | 222 | lladdr, IEEE802154_ADDR_LEN); |
44331fe2 AS |
223 | if (prefcount > 0) |
224 | memcpy(ipaddr, prefix, prefcount); | |
225 | ||
226 | if (prefcount + postcount < 16) | |
227 | memset(&ipaddr->s6_addr[prefcount], 0, | |
228 | 16 - (prefcount + postcount)); | |
229 | ||
230 | if (postcount > 0) { | |
231 | memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount); | |
232 | skb_pull(skb, postcount); | |
233 | } else if (prefcount > 0) { | |
234 | if (lladdr == NULL) | |
235 | return -EINVAL; | |
236 | ||
237 | /* no IID based configuration if no prefix and no data */ | |
238 | lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr); | |
239 | } | |
240 | ||
e71094f9 | 241 | pr_debug("uncompressing %d + %d => ", prefcount, postcount); |
44331fe2 AS |
242 | lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
3bd5b958 | 247 | static void |
248 | lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) | |
249 | { | |
250 | struct udphdr *uh = udp_hdr(skb); | |
251 | ||
3bd5b958 | 252 | if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) == |
253 | LOWPAN_NHC_UDP_4BIT_PORT) && | |
254 | ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) == | |
255 | LOWPAN_NHC_UDP_4BIT_PORT)) { | |
e71094f9 | 256 | pr_debug("UDP header: both ports compression to 4 bits\n"); |
3bd5b958 | 257 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11; |
258 | **(hc06_ptr + 1) = /* subtraction is faster */ | |
259 | (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) + | |
260 | ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4)); | |
261 | *hc06_ptr += 2; | |
262 | } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) == | |
263 | LOWPAN_NHC_UDP_8BIT_PORT) { | |
e71094f9 | 264 | pr_debug("UDP header: remove 8 bits of dest\n"); |
3bd5b958 | 265 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01; |
266 | memcpy(*hc06_ptr + 1, &uh->source, 2); | |
267 | **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT); | |
268 | *hc06_ptr += 4; | |
269 | } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) == | |
270 | LOWPAN_NHC_UDP_8BIT_PORT) { | |
e71094f9 | 271 | pr_debug("UDP header: remove 8 bits of source\n"); |
3bd5b958 | 272 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10; |
273 | memcpy(*hc06_ptr + 1, &uh->dest, 2); | |
274 | **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT); | |
275 | *hc06_ptr += 4; | |
276 | } else { | |
e71094f9 | 277 | pr_debug("UDP header: can't compress\n"); |
3bd5b958 | 278 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00; |
279 | memcpy(*hc06_ptr + 1, &uh->source, 2); | |
280 | memcpy(*hc06_ptr + 3, &uh->dest, 2); | |
281 | *hc06_ptr += 5; | |
282 | } | |
283 | ||
284 | /* checksum is always inline */ | |
285 | memcpy(*hc06_ptr, &uh->check, 2); | |
286 | *hc06_ptr += 2; | |
287 | } | |
288 | ||
c5d3687f | 289 | static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val) |
44331fe2 | 290 | { |
c5d3687f | 291 | if (unlikely(!pskb_may_pull(skb, 1))) |
292 | return -EINVAL; | |
44331fe2 | 293 | |
c5d3687f | 294 | *val = skb->data[0]; |
44331fe2 AS |
295 | skb_pull(skb, 1); |
296 | ||
c5d3687f | 297 | return 0; |
44331fe2 AS |
298 | } |
299 | ||
c5d3687f | 300 | static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val) |
719269af | 301 | { |
c5d3687f | 302 | if (unlikely(!pskb_may_pull(skb, 2))) |
303 | return -EINVAL; | |
719269af | 304 | |
4576039f | 305 | *val = (skb->data[0] << 8) | skb->data[1]; |
719269af | 306 | skb_pull(skb, 2); |
c5d3687f | 307 | |
308 | return 0; | |
719269af | 309 | } |
310 | ||
f8b1b5d2 | 311 | static int |
312 | lowpan_uncompress_udp_header(struct sk_buff *skb) | |
313 | { | |
314 | struct udphdr *uh = udp_hdr(skb); | |
315 | u8 tmp; | |
316 | ||
d4787a15 TC |
317 | if (!uh) |
318 | goto err; | |
319 | ||
c5d3687f | 320 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
321 | goto err; | |
f8b1b5d2 | 322 | |
323 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { | |
e71094f9 | 324 | pr_debug("UDP header uncompression\n"); |
f8b1b5d2 | 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: | |
e71094f9 | 350 | pr_debug("ERROR: unknown UDP format\n"); |
f8b1b5d2 | 351 | goto err; |
352 | break; | |
353 | } | |
354 | ||
e71094f9 | 355 | pr_debug("uncompressed UDP ports: src = %d, dst = %d\n", |
356 | uh->source, uh->dest); | |
f8b1b5d2 | 357 | |
358 | /* copy checksum */ | |
359 | memcpy(&uh->check, &skb->data[0], 2); | |
360 | skb_pull(skb, 2); | |
361 | } else { | |
e71094f9 | 362 | pr_debug("ERROR: unsupported NH format\n"); |
f8b1b5d2 | 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 | ||
e71094f9 | 395 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" |
396 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version, | |
397 | ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit); | |
44331fe2 AS |
398 | |
399 | lowpan_raw_dump_table(__func__, "raw skb network header dump", | |
400 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
401 | ||
402 | if (!saddr) | |
403 | saddr = dev->dev_addr; | |
404 | ||
405 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
406 | ||
407 | /* | |
408 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
409 | * we sometimes use |= | |
410 | * If the field is 0, and the current bit value in memory is 1, | |
411 | * this does not work. We therefore reset the IPHC encoding here | |
412 | */ | |
413 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
414 | iphc1 = 0; | |
415 | ||
416 | /* TODO: context lookup */ | |
417 | ||
418 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
419 | ||
420 | /* | |
421 | * Traffic class, flow label | |
422 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
423 | * We have to process both in the same time as the offset of traffic | |
424 | * class depends on the presence of version and flow label | |
425 | */ | |
426 | ||
427 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
428 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
429 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
430 | ||
431 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
432 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
433 | /* flow label can be compressed */ | |
434 | iphc0 |= LOWPAN_IPHC_FL_C; | |
435 | if ((hdr->priority == 0) && | |
436 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
437 | /* compress (elide) all */ | |
438 | iphc0 |= LOWPAN_IPHC_TC_C; | |
439 | } else { | |
440 | /* compress only the flow label */ | |
441 | *hc06_ptr = tmp; | |
442 | hc06_ptr += 1; | |
443 | } | |
444 | } else { | |
445 | /* Flow label cannot be compressed */ | |
446 | if ((hdr->priority == 0) && | |
447 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
448 | /* compress only traffic class */ | |
449 | iphc0 |= LOWPAN_IPHC_TC_C; | |
450 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
451 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
452 | hc06_ptr += 3; | |
453 | } else { | |
454 | /* compress nothing */ | |
455 | memcpy(hc06_ptr, &hdr, 4); | |
456 | /* replace the top byte with new ECN | DSCP format */ | |
457 | *hc06_ptr = tmp; | |
458 | hc06_ptr += 4; | |
459 | } | |
460 | } | |
461 | ||
462 | /* NOTE: payload length is always compressed */ | |
463 | ||
464 | /* Next Header is compress if UDP */ | |
465 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
466 | iphc0 |= LOWPAN_IPHC_NH_C; | |
467 | ||
44331fe2 AS |
468 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { |
469 | *hc06_ptr = hdr->nexthdr; | |
470 | hc06_ptr += 1; | |
471 | } | |
472 | ||
473 | /* | |
474 | * Hop limit | |
475 | * if 1: compress, encoding is 01 | |
476 | * if 64: compress, encoding is 10 | |
477 | * if 255: compress, encoding is 11 | |
478 | * else do not compress | |
479 | */ | |
480 | switch (hdr->hop_limit) { | |
481 | case 1: | |
482 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
483 | break; | |
484 | case 64: | |
485 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
486 | break; | |
487 | case 255: | |
488 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
489 | break; | |
490 | default: | |
491 | *hc06_ptr = hdr->hop_limit; | |
5c00c0cb | 492 | hc06_ptr += 1; |
44331fe2 AS |
493 | break; |
494 | } | |
495 | ||
496 | /* source address compression */ | |
497 | if (is_addr_unspecified(&hdr->saddr)) { | |
e71094f9 | 498 | pr_debug("source address is unspecified, setting SAC\n"); |
44331fe2 AS |
499 | iphc1 |= LOWPAN_IPHC_SAC; |
500 | /* TODO: context lookup */ | |
501 | } else if (is_addr_link_local(&hdr->saddr)) { | |
e71094f9 | 502 | pr_debug("source address is link-local\n"); |
44331fe2 AS |
503 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
504 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); | |
505 | } else { | |
e71094f9 | 506 | pr_debug("send the full source address\n"); |
44331fe2 AS |
507 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); |
508 | hc06_ptr += 16; | |
509 | } | |
510 | ||
511 | /* destination address compression */ | |
512 | if (is_addr_mcast(&hdr->daddr)) { | |
e71094f9 | 513 | pr_debug("destination address is multicast: "); |
44331fe2 AS |
514 | iphc1 |= LOWPAN_IPHC_M; |
515 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
516 | pr_debug("compressed to 1 octet\n"); | |
517 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
518 | /* use last byte */ | |
519 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
520 | hc06_ptr += 1; | |
521 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
522 | pr_debug("compressed to 4 octets\n"); | |
523 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
524 | /* second byte + the last three */ | |
525 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
526 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
527 | hc06_ptr += 4; | |
528 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
529 | pr_debug("compressed to 6 octets\n"); | |
530 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
531 | /* second byte + the last five */ | |
532 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
533 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
534 | hc06_ptr += 6; | |
535 | } else { | |
536 | pr_debug("using full address\n"); | |
537 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
538 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
539 | hc06_ptr += 16; | |
540 | } | |
541 | } else { | |
44331fe2 AS |
542 | /* TODO: context lookup */ |
543 | if (is_addr_link_local(&hdr->daddr)) { | |
e71094f9 | 544 | pr_debug("dest address is unicast and link-local\n"); |
44331fe2 AS |
545 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
546 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); | |
547 | } else { | |
e71094f9 | 548 | pr_debug("dest address is unicast: using full one\n"); |
44331fe2 AS |
549 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); |
550 | hc06_ptr += 16; | |
551 | } | |
552 | } | |
553 | ||
3bd5b958 | 554 | /* UDP header compression */ |
555 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
556 | lowpan_compress_udp_header(&hc06_ptr, skb); | |
44331fe2 AS |
557 | |
558 | head[0] = iphc0; | |
559 | head[1] = iphc1; | |
560 | ||
561 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
562 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
563 | ||
564 | kfree(head); | |
565 | ||
566 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
567 | skb->len); | |
568 | ||
569 | /* | |
570 | * NOTE1: I'm still unsure about the fact that compression and WPAN | |
571 | * header are created here and not later in the xmit. So wait for | |
572 | * an opinion of net maintainers. | |
573 | */ | |
574 | /* | |
575 | * NOTE2: to be absolutely correct, we must derive PANid information | |
576 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
577 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
578 | */ | |
579 | { | |
580 | /* prepare wpan address data */ | |
581 | sa.addr_type = IEEE802154_ADDR_LONG; | |
582 | sa.pan_id = 0xff; | |
583 | ||
584 | da.addr_type = IEEE802154_ADDR_LONG; | |
585 | da.pan_id = 0xff; | |
586 | ||
587 | memcpy(&(da.hwaddr), daddr, 8); | |
588 | memcpy(&(sa.hwaddr), saddr, 8); | |
589 | ||
590 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; | |
719269af | 591 | |
44331fe2 AS |
592 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
593 | type, (void *)&da, (void *)&sa, skb->len); | |
594 | } | |
595 | } | |
596 | ||
597 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) | |
598 | { | |
599 | struct sk_buff *new; | |
600 | struct lowpan_dev_record *entry; | |
601 | int stat = NET_RX_SUCCESS; | |
602 | ||
603 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
dcef1151 | 604 | GFP_ATOMIC); |
44331fe2 AS |
605 | kfree_skb(skb); |
606 | ||
dcef1151 | 607 | if (!new) |
44331fe2 AS |
608 | return -ENOMEM; |
609 | ||
610 | skb_push(new, sizeof(struct ipv6hdr)); | |
611 | skb_reset_network_header(new); | |
612 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
613 | ||
614 | new->protocol = htons(ETH_P_IPV6); | |
615 | new->pkt_type = PACKET_HOST; | |
616 | ||
617 | rcu_read_lock(); | |
618 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
619 | if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) { | |
dcef1151 | 620 | skb = skb_copy(new, GFP_ATOMIC); |
621 | if (!skb) { | |
622 | stat = -ENOMEM; | |
623 | break; | |
624 | } | |
44331fe2 | 625 | |
dcef1151 | 626 | skb->dev = entry->ldev; |
627 | stat = netif_rx(skb); | |
44331fe2 AS |
628 | } |
629 | rcu_read_unlock(); | |
630 | ||
631 | kfree_skb(new); | |
632 | ||
633 | return stat; | |
634 | } | |
635 | ||
719269af | 636 | static void lowpan_fragment_timer_expired(unsigned long entry_addr) |
637 | { | |
638 | struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; | |
639 | ||
e71094f9 | 640 | pr_debug("timer expired for frame with tag %d\n", entry->tag); |
719269af | 641 | |
719269af | 642 | list_del(&entry->list); |
719269af | 643 | dev_kfree_skb(entry->skb); |
644 | kfree(entry); | |
645 | } | |
646 | ||
c2e94d73 | 647 | static struct lowpan_fragment * |
5e96855f | 648 | lowpan_alloc_new_frame(struct sk_buff *skb, u8 len, u16 tag) |
c2e94d73 | 649 | { |
650 | struct lowpan_fragment *frame; | |
651 | ||
652 | frame = kzalloc(sizeof(struct lowpan_fragment), | |
653 | GFP_ATOMIC); | |
654 | if (!frame) | |
655 | goto frame_err; | |
656 | ||
657 | INIT_LIST_HEAD(&frame->list); | |
658 | ||
5e96855f | 659 | frame->length = len; |
c2e94d73 | 660 | frame->tag = tag; |
661 | ||
662 | /* allocate buffer for frame assembling */ | |
79ff1db6 | 663 | frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length + |
664 | sizeof(struct ipv6hdr)); | |
c2e94d73 | 665 | |
666 | if (!frame->skb) | |
667 | goto skb_err; | |
668 | ||
669 | frame->skb->priority = skb->priority; | |
670 | frame->skb->dev = skb->dev; | |
671 | ||
672 | /* reserve headroom for uncompressed ipv6 header */ | |
673 | skb_reserve(frame->skb, sizeof(struct ipv6hdr)); | |
674 | skb_put(frame->skb, frame->length); | |
675 | ||
676 | init_timer(&frame->timer); | |
677 | /* time out is the same as for ipv6 - 60 sec */ | |
678 | frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; | |
679 | frame->timer.data = (unsigned long)frame; | |
680 | frame->timer.function = lowpan_fragment_timer_expired; | |
681 | ||
682 | add_timer(&frame->timer); | |
683 | ||
684 | list_add_tail(&frame->list, &lowpan_fragments); | |
685 | ||
686 | return frame; | |
687 | ||
688 | skb_err: | |
689 | kfree(frame); | |
690 | frame_err: | |
691 | return NULL; | |
692 | } | |
693 | ||
44331fe2 AS |
694 | static int |
695 | lowpan_process_data(struct sk_buff *skb) | |
696 | { | |
697 | struct ipv6hdr hdr; | |
698 | u8 tmp, iphc0, iphc1, num_context = 0; | |
699 | u8 *_saddr, *_daddr; | |
700 | int err; | |
701 | ||
702 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
703 | skb->len); | |
704 | /* at least two bytes will be used for the encoding */ | |
705 | if (skb->len < 2) | |
706 | goto drop; | |
c5d3687f | 707 | |
708 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
709 | goto drop; | |
719269af | 710 | |
711 | /* fragments assembling */ | |
712 | switch (iphc0 & LOWPAN_DISPATCH_MASK) { | |
713 | case LOWPAN_DISPATCH_FRAG1: | |
714 | case LOWPAN_DISPATCH_FRAGN: | |
715 | { | |
716 | struct lowpan_fragment *frame; | |
5e96855f TC |
717 | /* slen stores the rightmost 8 bits of the 11 bits length */ |
718 | u8 slen, offset; | |
719 | u16 len, tag; | |
719269af | 720 | bool found = false; |
721 | ||
5e96855f | 722 | if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */ |
c5d3687f | 723 | lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */ |
724 | goto drop; | |
719269af | 725 | |
5e96855f TC |
726 | /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */ |
727 | len = ((iphc0 & 7) << 8) | slen; | |
728 | ||
719269af | 729 | /* |
730 | * check if frame assembling with the same tag is | |
731 | * already in progress | |
732 | */ | |
33c34c5e | 733 | spin_lock_bh(&flist_lock); |
719269af | 734 | |
735 | list_for_each_entry(frame, &lowpan_fragments, list) | |
736 | if (frame->tag == tag) { | |
737 | found = true; | |
738 | break; | |
739 | } | |
740 | ||
741 | /* alloc new frame structure */ | |
742 | if (!found) { | |
5e96855f | 743 | frame = lowpan_alloc_new_frame(skb, len, tag); |
719269af | 744 | if (!frame) |
745 | goto unlock_and_drop; | |
719269af | 746 | } |
747 | ||
748 | if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) | |
749 | goto unlock_and_drop; | |
750 | ||
c5d3687f | 751 | if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */ |
752 | goto unlock_and_drop; | |
719269af | 753 | |
754 | /* if payload fits buffer, copy it */ | |
755 | if (likely((offset * 8 + skb->len) <= frame->length)) | |
756 | skb_copy_to_linear_data_offset(frame->skb, offset * 8, | |
757 | skb->data, skb->len); | |
758 | else | |
759 | goto unlock_and_drop; | |
760 | ||
761 | frame->bytes_rcv += skb->len; | |
762 | ||
763 | /* frame assembling complete */ | |
764 | if ((frame->bytes_rcv == frame->length) && | |
765 | frame->timer.expires > jiffies) { | |
766 | /* if timer haven't expired - first of all delete it */ | |
33c34c5e | 767 | del_timer_sync(&frame->timer); |
719269af | 768 | list_del(&frame->list); |
33c34c5e | 769 | spin_unlock_bh(&flist_lock); |
719269af | 770 | |
771 | dev_kfree_skb(skb); | |
772 | skb = frame->skb; | |
773 | kfree(frame); | |
c5d3687f | 774 | |
775 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
747cf6ed | 776 | goto drop; |
c5d3687f | 777 | |
719269af | 778 | break; |
779 | } | |
33c34c5e | 780 | spin_unlock_bh(&flist_lock); |
719269af | 781 | |
782 | return kfree_skb(skb), 0; | |
783 | } | |
784 | default: | |
785 | break; | |
786 | } | |
787 | ||
c5d3687f | 788 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
789 | goto drop; | |
44331fe2 AS |
790 | |
791 | _saddr = mac_cb(skb)->sa.hwaddr; | |
792 | _daddr = mac_cb(skb)->da.hwaddr; | |
793 | ||
e71094f9 | 794 | pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1); |
44331fe2 AS |
795 | |
796 | /* another if the CID flag is set */ | |
797 | if (iphc1 & LOWPAN_IPHC_CID) { | |
e71094f9 | 798 | pr_debug("CID flag is set, increase header with one\n"); |
c5d3687f | 799 | if (lowpan_fetch_skb_u8(skb, &num_context)) |
44331fe2 | 800 | goto drop; |
44331fe2 AS |
801 | } |
802 | ||
803 | hdr.version = 6; | |
804 | ||
805 | /* Traffic Class and Flow Label */ | |
806 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
807 | /* | |
808 | * Traffic Class and FLow Label carried in-line | |
809 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
810 | */ | |
811 | case 0: /* 00b */ | |
c5d3687f | 812 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 813 | goto drop; |
c5d3687f | 814 | |
44331fe2 AS |
815 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); |
816 | skb_pull(skb, 3); | |
817 | hdr.priority = ((tmp >> 2) & 0x0f); | |
818 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
819 | (hdr.flow_lbl[0] & 0x0f); | |
820 | break; | |
821 | /* | |
822 | * Traffic class carried in-line | |
823 | * ECN + DSCP (1 byte), Flow Label is elided | |
824 | */ | |
825 | case 1: /* 10b */ | |
c5d3687f | 826 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 827 | goto drop; |
c5d3687f | 828 | |
44331fe2 AS |
829 | hdr.priority = ((tmp >> 2) & 0x0f); |
830 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
831 | hdr.flow_lbl[1] = 0; | |
832 | hdr.flow_lbl[2] = 0; | |
833 | break; | |
834 | /* | |
835 | * Flow Label carried in-line | |
836 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
837 | */ | |
838 | case 2: /* 01b */ | |
c5d3687f | 839 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 840 | goto drop; |
c5d3687f | 841 | |
44331fe2 AS |
842 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); |
843 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
844 | skb_pull(skb, 2); | |
845 | break; | |
846 | /* Traffic Class and Flow Label are elided */ | |
847 | case 3: /* 11b */ | |
848 | hdr.priority = 0; | |
849 | hdr.flow_lbl[0] = 0; | |
850 | hdr.flow_lbl[1] = 0; | |
851 | hdr.flow_lbl[2] = 0; | |
852 | break; | |
853 | default: | |
854 | break; | |
855 | } | |
856 | ||
857 | /* Next Header */ | |
858 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
859 | /* Next header is carried inline */ | |
c5d3687f | 860 | if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr))) |
44331fe2 | 861 | goto drop; |
c5d3687f | 862 | |
e71094f9 | 863 | pr_debug("NH flag is set, next header carried inline: %02x\n", |
864 | hdr.nexthdr); | |
44331fe2 AS |
865 | } |
866 | ||
867 | /* Hop Limit */ | |
868 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
869 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
870 | else { | |
c5d3687f | 871 | if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit))) |
44331fe2 | 872 | goto drop; |
44331fe2 AS |
873 | } |
874 | ||
875 | /* Extract SAM to the tmp variable */ | |
876 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
877 | ||
878 | /* Source address uncompression */ | |
e71094f9 | 879 | pr_debug("source address stateless compression\n"); |
44331fe2 AS |
880 | err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix, |
881 | lowpan_unc_llconf[tmp], skb->data); | |
882 | if (err) | |
883 | goto drop; | |
884 | ||
885 | /* Extract DAM to the tmp variable */ | |
886 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
887 | ||
888 | /* check for Multicast Compression */ | |
889 | if (iphc1 & LOWPAN_IPHC_M) { | |
890 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
e71094f9 | 891 | pr_debug("dest: context-based mcast compression\n"); |
44331fe2 AS |
892 | /* TODO: implement this */ |
893 | } else { | |
894 | u8 prefix[] = {0xff, 0x02}; | |
895 | ||
e71094f9 | 896 | pr_debug("dest: non context-based mcast compression\n"); |
44331fe2 | 897 | if (0 < tmp && tmp < 3) { |
c5d3687f | 898 | if (lowpan_fetch_skb_u8(skb, &prefix[1])) |
44331fe2 | 899 | goto drop; |
44331fe2 AS |
900 | } |
901 | ||
902 | err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix, | |
903 | lowpan_unc_mxconf[tmp], NULL); | |
904 | if (err) | |
905 | goto drop; | |
906 | } | |
907 | } else { | |
e71094f9 | 908 | pr_debug("dest: stateless compression\n"); |
44331fe2 AS |
909 | err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, |
910 | lowpan_unc_llconf[tmp], skb->data); | |
911 | if (err) | |
912 | goto drop; | |
913 | } | |
914 | ||
f8b1b5d2 | 915 | /* UDP data uncompression */ |
916 | if (iphc0 & LOWPAN_IPHC_NH_C) | |
917 | if (lowpan_uncompress_udp_header(skb)) | |
918 | goto drop; | |
44331fe2 AS |
919 | |
920 | /* Not fragmented package */ | |
921 | hdr.payload_len = htons(skb->len); | |
922 | ||
e71094f9 | 923 | pr_debug("skb headroom size = %d, data length = %d\n", |
924 | skb_headroom(skb), skb->len); | |
44331fe2 | 925 | |
e71094f9 | 926 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" |
927 | "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version, | |
44331fe2 AS |
928 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); |
929 | ||
930 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
931 | sizeof(hdr)); | |
932 | return lowpan_skb_deliver(skb, &hdr); | |
719269af | 933 | |
934 | unlock_and_drop: | |
33c34c5e | 935 | spin_unlock_bh(&flist_lock); |
44331fe2 | 936 | drop: |
90d0963d | 937 | kfree_skb(skb); |
44331fe2 AS |
938 | return -EINVAL; |
939 | } | |
940 | ||
42c36295 | 941 | static int lowpan_set_address(struct net_device *dev, void *p) |
942 | { | |
943 | struct sockaddr *sa = p; | |
944 | ||
945 | if (netif_running(dev)) | |
946 | return -EBUSY; | |
947 | ||
948 | /* TODO: validate addr */ | |
949 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
950 | ||
951 | return 0; | |
952 | } | |
953 | ||
719269af | 954 | static int lowpan_get_mac_header_length(struct sk_buff *skb) |
955 | { | |
956 | /* | |
957 | * Currently long addressing mode is supported only, so the overall | |
958 | * header size is 21: | |
959 | * FC SeqNum DPAN DA SA Sec | |
960 | * 2 + 1 + 2 + 8 + 8 + 0 = 21 | |
961 | */ | |
962 | return 21; | |
963 | } | |
964 | ||
965 | static int | |
966 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, | |
967 | int mlen, int plen, int offset) | |
968 | { | |
969 | struct sk_buff *frag; | |
970 | int hlen, ret; | |
971 | ||
972 | /* if payload length is zero, therefore it's a first fragment */ | |
973 | hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE); | |
974 | ||
975 | lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); | |
976 | ||
977 | frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE); | |
978 | if (!frag) | |
979 | return -ENOMEM; | |
980 | ||
981 | frag->priority = skb->priority; | |
982 | frag->dev = skb->dev; | |
983 | ||
984 | /* copy header, MFR and payload */ | |
985 | memcpy(skb_put(frag, mlen), skb->data, mlen); | |
986 | memcpy(skb_put(frag, hlen), head, hlen); | |
987 | ||
988 | if (plen) | |
989 | skb_copy_from_linear_data_offset(skb, offset + mlen, | |
990 | skb_put(frag, plen), plen); | |
991 | ||
992 | lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, | |
993 | frag->len); | |
994 | ||
995 | ret = dev_queue_xmit(frag); | |
996 | ||
719269af | 997 | return ret; |
998 | } | |
999 | ||
1000 | static int | |
1001 | lowpan_skb_fragmentation(struct sk_buff *skb) | |
1002 | { | |
1003 | int err, header_length, payload_length, tag, offset = 0; | |
1004 | u8 head[5]; | |
1005 | ||
1006 | header_length = lowpan_get_mac_header_length(skb); | |
1007 | payload_length = skb->len - header_length; | |
1008 | tag = fragment_tag++; | |
1009 | ||
1010 | /* first fragment header */ | |
5e96855f TC |
1011 | head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7); |
1012 | head[1] = payload_length & 0xff; | |
4576039f TC |
1013 | head[2] = tag >> 8; |
1014 | head[3] = tag & 0xff; | |
719269af | 1015 | |
1016 | err = lowpan_fragment_xmit(skb, head, header_length, 0, 0); | |
1017 | ||
1018 | /* next fragment header */ | |
1019 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
1020 | head[0] |= LOWPAN_DISPATCH_FRAGN; | |
1021 | ||
1022 | while ((payload_length - offset > 0) && (err >= 0)) { | |
1023 | int len = LOWPAN_FRAG_SIZE; | |
1024 | ||
1025 | head[4] = offset / 8; | |
1026 | ||
1027 | if (payload_length - offset < len) | |
1028 | len = payload_length - offset; | |
1029 | ||
1030 | err = lowpan_fragment_xmit(skb, head, header_length, | |
1031 | len, offset); | |
1032 | offset += len; | |
1033 | } | |
1034 | ||
1035 | return err; | |
1036 | } | |
1037 | ||
44331fe2 AS |
1038 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
1039 | { | |
719269af | 1040 | int err = -1; |
44331fe2 | 1041 | |
e71094f9 | 1042 | pr_debug("package xmit\n"); |
44331fe2 AS |
1043 | |
1044 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
1045 | if (skb->dev == NULL) { | |
e71094f9 | 1046 | pr_debug("ERROR: no real wpan device found\n"); |
719269af | 1047 | goto error; |
1048 | } | |
1049 | ||
1050 | if (skb->len <= IEEE802154_MTU) { | |
44331fe2 | 1051 | err = dev_queue_xmit(skb); |
719269af | 1052 | goto out; |
1053 | } | |
1054 | ||
e71094f9 | 1055 | pr_debug("frame is too big, fragmentation is needed\n"); |
719269af | 1056 | err = lowpan_skb_fragmentation(skb); |
1057 | error: | |
1058 | dev_kfree_skb(skb); | |
1059 | out: | |
1060 | if (err < 0) | |
e71094f9 | 1061 | pr_debug("ERROR: xmit failed\n"); |
44331fe2 AS |
1062 | |
1063 | return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK); | |
1064 | } | |
1065 | ||
1066 | static void lowpan_dev_free(struct net_device *dev) | |
1067 | { | |
1068 | dev_put(lowpan_dev_info(dev)->real_dev); | |
1069 | free_netdev(dev); | |
1070 | } | |
1071 | ||
0848e404 | 1072 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
1073 | { | |
1074 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1075 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); | |
1076 | } | |
1077 | ||
1078 | static u16 lowpan_get_pan_id(const struct net_device *dev) | |
1079 | { | |
1080 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1081 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); | |
1082 | } | |
1083 | ||
1084 | static u16 lowpan_get_short_addr(const struct net_device *dev) | |
1085 | { | |
1086 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1087 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); | |
1088 | } | |
1089 | ||
44331fe2 AS |
1090 | static struct header_ops lowpan_header_ops = { |
1091 | .create = lowpan_header_create, | |
1092 | }; | |
1093 | ||
1094 | static const struct net_device_ops lowpan_netdev_ops = { | |
1095 | .ndo_start_xmit = lowpan_xmit, | |
42c36295 | 1096 | .ndo_set_mac_address = lowpan_set_address, |
44331fe2 AS |
1097 | }; |
1098 | ||
0848e404 | 1099 | static struct ieee802154_mlme_ops lowpan_mlme = { |
1100 | .get_pan_id = lowpan_get_pan_id, | |
1101 | .get_phy = lowpan_get_phy, | |
1102 | .get_short_addr = lowpan_get_short_addr, | |
1103 | }; | |
1104 | ||
44331fe2 AS |
1105 | static void lowpan_setup(struct net_device *dev) |
1106 | { | |
44331fe2 AS |
1107 | dev->addr_len = IEEE802154_ADDR_LEN; |
1108 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
1109 | dev->type = ARPHRD_IEEE802154; | |
44331fe2 AS |
1110 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
1111 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
1112 | dev->needed_tailroom = 2; /* FCS */ | |
1113 | dev->mtu = 1281; | |
1114 | dev->tx_queue_len = 0; | |
4d039f68 | 1115 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
44331fe2 AS |
1116 | dev->watchdog_timeo = 0; |
1117 | ||
1118 | dev->netdev_ops = &lowpan_netdev_ops; | |
1119 | dev->header_ops = &lowpan_header_ops; | |
0848e404 | 1120 | dev->ml_priv = &lowpan_mlme; |
44331fe2 AS |
1121 | dev->destructor = lowpan_dev_free; |
1122 | } | |
1123 | ||
1124 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1125 | { | |
44331fe2 AS |
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 | { | |
a437d274 AO |
1136 | struct sk_buff *local_skb; |
1137 | ||
44331fe2 AS |
1138 | if (!netif_running(dev)) |
1139 | goto drop; | |
1140 | ||
1141 | if (dev->type != ARPHRD_IEEE802154) | |
1142 | goto drop; | |
1143 | ||
1144 | /* check that it's our buffer */ | |
719269af | 1145 | switch (skb->data[0] & 0xe0) { |
1146 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
1147 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ | |
1148 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ | |
a437d274 AO |
1149 | local_skb = skb_clone(skb, GFP_ATOMIC); |
1150 | if (!local_skb) | |
1151 | goto drop; | |
1152 | lowpan_process_data(local_skb); | |
1153 | ||
1154 | kfree_skb(skb); | |
719269af | 1155 | break; |
1156 | default: | |
1157 | break; | |
1158 | } | |
44331fe2 AS |
1159 | |
1160 | return NET_RX_SUCCESS; | |
1161 | ||
1162 | drop: | |
1163 | kfree_skb(skb); | |
1164 | return NET_RX_DROP; | |
1165 | } | |
1166 | ||
1167 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
1168 | struct nlattr *tb[], struct nlattr *data[]) | |
1169 | { | |
1170 | struct net_device *real_dev; | |
1171 | struct lowpan_dev_record *entry; | |
1172 | ||
e71094f9 | 1173 | pr_debug("adding new link\n"); |
44331fe2 AS |
1174 | |
1175 | if (!tb[IFLA_LINK]) | |
1176 | return -EINVAL; | |
1177 | /* find and hold real wpan device */ | |
1178 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
1179 | if (!real_dev) | |
1180 | return -ENODEV; | |
1181 | ||
1182 | lowpan_dev_info(dev)->real_dev = real_dev; | |
1183 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); | |
1184 | ||
1185 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); | |
dc00fd44 DC |
1186 | if (!entry) { |
1187 | dev_put(real_dev); | |
1188 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 1189 | return -ENOMEM; |
dc00fd44 | 1190 | } |
44331fe2 AS |
1191 | |
1192 | entry->ldev = dev; | |
1193 | ||
1194 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1195 | INIT_LIST_HEAD(&entry->list); | |
1196 | list_add_tail(&entry->list, &lowpan_devices); | |
1197 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1198 | ||
1199 | register_netdevice(dev); | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
1205 | { | |
1206 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
1207 | struct net_device *real_dev = lowpan_dev->real_dev; | |
8deff4af | 1208 | struct lowpan_dev_record *entry, *tmp; |
44331fe2 AS |
1209 | |
1210 | ASSERT_RTNL(); | |
1211 | ||
1212 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
aec9db35 | 1213 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
1214 | if (entry->ldev == dev) { |
1215 | list_del(&entry->list); | |
1216 | kfree(entry); | |
1217 | } | |
aec9db35 | 1218 | } |
44331fe2 AS |
1219 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
1220 | ||
1221 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
1222 | ||
1223 | unregister_netdevice_queue(dev, head); | |
1224 | ||
1225 | dev_put(real_dev); | |
1226 | } | |
1227 | ||
1228 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
1229 | .kind = "lowpan", | |
1230 | .priv_size = sizeof(struct lowpan_dev_info), | |
1231 | .setup = lowpan_setup, | |
1232 | .newlink = lowpan_newlink, | |
1233 | .dellink = lowpan_dellink, | |
1234 | .validate = lowpan_validate, | |
1235 | }; | |
1236 | ||
1237 | static inline int __init lowpan_netlink_init(void) | |
1238 | { | |
1239 | return rtnl_link_register(&lowpan_link_ops); | |
1240 | } | |
1241 | ||
1242 | static inline void __init lowpan_netlink_fini(void) | |
1243 | { | |
1244 | rtnl_link_unregister(&lowpan_link_ops); | |
1245 | } | |
1246 | ||
1247 | static struct packet_type lowpan_packet_type = { | |
1248 | .type = __constant_htons(ETH_P_IEEE802154), | |
1249 | .func = lowpan_rcv, | |
1250 | }; | |
1251 | ||
1252 | static int __init lowpan_init_module(void) | |
1253 | { | |
1254 | int err = 0; | |
1255 | ||
44331fe2 AS |
1256 | err = lowpan_netlink_init(); |
1257 | if (err < 0) | |
1258 | goto out; | |
1259 | ||
1260 | dev_add_pack(&lowpan_packet_type); | |
1261 | out: | |
1262 | return err; | |
1263 | } | |
1264 | ||
1265 | static void __exit lowpan_cleanup_module(void) | |
1266 | { | |
33c34c5e | 1267 | struct lowpan_fragment *frame, *tframe; |
1268 | ||
44331fe2 AS |
1269 | lowpan_netlink_fini(); |
1270 | ||
1271 | dev_remove_pack(&lowpan_packet_type); | |
33c34c5e | 1272 | |
1273 | /* Now 6lowpan packet_type is removed, so no new fragments are | |
1274 | * expected on RX, therefore that's the time to clean incomplete | |
1275 | * fragments. | |
1276 | */ | |
1277 | spin_lock_bh(&flist_lock); | |
1278 | list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) { | |
1279 | del_timer_sync(&frame->timer); | |
1280 | list_del(&frame->list); | |
1281 | dev_kfree_skb(frame->skb); | |
1282 | kfree(frame); | |
1283 | } | |
1284 | spin_unlock_bh(&flist_lock); | |
44331fe2 AS |
1285 | } |
1286 | ||
1287 | module_init(lowpan_init_module); | |
1288 | module_exit(lowpan_cleanup_module); | |
1289 | MODULE_LICENSE("GPL"); | |
1290 | MODULE_ALIAS_RTNL_LINK("lowpan"); |