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44331fe2 AS |
1 | /* |
2 | * Copyright 2011, Siemens AG | |
3 | * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
4 | */ | |
5 | ||
6 | /* | |
7 | * Based on patches from Jon Smirl <jonsmirl@gmail.com> | |
8 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 | |
12 | * as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | */ | |
23 | ||
24 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
25 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
26 | * All rights reserved. | |
27 | * | |
28 | * Redistribution and use in source and binary forms, with or without | |
29 | * modification, are permitted provided that the following conditions | |
30 | * are met: | |
31 | * 1. Redistributions of source code must retain the above copyright | |
32 | * notice, this list of conditions and the following disclaimer. | |
33 | * 2. Redistributions in binary form must reproduce the above copyright | |
34 | * notice, this list of conditions and the following disclaimer in the | |
35 | * documentation and/or other materials provided with the distribution. | |
36 | * 3. Neither the name of the Institute nor the names of its contributors | |
37 | * may be used to endorse or promote products derived from this software | |
38 | * without specific prior written permission. | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
51 | */ | |
52 | ||
44331fe2 AS |
53 | #include <linux/bitops.h> |
54 | #include <linux/if_arp.h> | |
55 | #include <linux/module.h> | |
56 | #include <linux/moduleparam.h> | |
57 | #include <linux/netdevice.h> | |
58 | #include <net/af_ieee802154.h> | |
59 | #include <net/ieee802154.h> | |
60 | #include <net/ieee802154_netdev.h> | |
61 | #include <net/ipv6.h> | |
62 | ||
63 | #include "6lowpan.h" | |
64 | ||
65 | /* TTL uncompression values */ | |
66 | static const u8 lowpan_ttl_values[] = {0, 1, 64, 255}; | |
67 | ||
68 | static LIST_HEAD(lowpan_devices); | |
69 | ||
70 | /* | |
71 | * Uncompression of linklocal: | |
72 | * 0 -> 16 bytes from packet | |
73 | * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet | |
74 | * 2 -> 2 bytes from prefix - zeroes + 2 from packet | |
75 | * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr | |
76 | * | |
77 | * NOTE: => the uncompress function does change 0xf to 0x10 | |
78 | * NOTE: 0x00 => no-autoconfig => unspecified | |
79 | */ | |
80 | static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20}; | |
81 | ||
82 | /* | |
83 | * Uncompression of ctx-based: | |
84 | * 0 -> 0 bits from packet [unspecified / reserved] | |
85 | * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet | |
86 | * 2 -> 8 bytes from prefix - zeroes + 2 from packet | |
87 | * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr | |
88 | */ | |
89 | static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80}; | |
90 | ||
91 | /* | |
92 | * Uncompression of ctx-base | |
93 | * 0 -> 0 bits from packet | |
94 | * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet | |
95 | * 2 -> 2 bytes from prefix - zeroes + 3 from packet | |
96 | * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr | |
97 | */ | |
98 | static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21}; | |
99 | ||
100 | /* Link local prefix */ | |
101 | static const u8 lowpan_llprefix[] = {0xfe, 0x80}; | |
102 | ||
103 | /* private device info */ | |
104 | struct lowpan_dev_info { | |
105 | struct net_device *real_dev; /* real WPAN device ptr */ | |
106 | struct mutex dev_list_mtx; /* mutex for list ops */ | |
107 | }; | |
108 | ||
109 | struct lowpan_dev_record { | |
110 | struct net_device *ldev; | |
111 | struct list_head list; | |
112 | }; | |
113 | ||
719269af | 114 | struct lowpan_fragment { |
115 | struct sk_buff *skb; /* skb to be assembled */ | |
116 | spinlock_t lock; /* concurency lock */ | |
117 | u16 length; /* length to be assemled */ | |
118 | u32 bytes_rcv; /* bytes received */ | |
119 | u16 tag; /* current fragment tag */ | |
120 | struct timer_list timer; /* assembling timer */ | |
121 | struct list_head list; /* fragments list */ | |
122 | }; | |
123 | ||
124 | static unsigned short fragment_tag; | |
125 | static LIST_HEAD(lowpan_fragments); | |
126 | spinlock_t flist_lock; | |
127 | ||
44331fe2 AS |
128 | static inline struct |
129 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
130 | { | |
131 | return netdev_priv(dev); | |
132 | } | |
133 | ||
134 | static inline void lowpan_address_flip(u8 *src, u8 *dest) | |
135 | { | |
136 | int i; | |
137 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) | |
138 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; | |
139 | } | |
140 | ||
141 | /* list of all 6lowpan devices, uses for package delivering */ | |
142 | /* print data in line */ | |
143 | static inline void lowpan_raw_dump_inline(const char *caller, char *msg, | |
144 | unsigned char *buf, int len) | |
145 | { | |
146 | #ifdef DEBUG | |
147 | if (msg) | |
148 | pr_debug("(%s) %s: ", caller, msg); | |
149 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, | |
150 | 16, 1, buf, len, false); | |
151 | #endif /* DEBUG */ | |
152 | } | |
153 | ||
154 | /* | |
155 | * print data in a table format: | |
156 | * | |
157 | * addr: xx xx xx xx xx xx | |
158 | * addr: xx xx xx xx xx xx | |
159 | * ... | |
160 | */ | |
161 | static inline void lowpan_raw_dump_table(const char *caller, char *msg, | |
162 | unsigned char *buf, int len) | |
163 | { | |
164 | #ifdef DEBUG | |
165 | if (msg) | |
166 | pr_debug("(%s) %s:\n", caller, msg); | |
167 | print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, | |
168 | 16, 1, buf, len, false); | |
169 | #endif /* DEBUG */ | |
170 | } | |
171 | ||
172 | static u8 | |
173 | lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr, | |
174 | const unsigned char *lladdr) | |
175 | { | |
176 | u8 val = 0; | |
177 | ||
178 | if (is_addr_mac_addr_based(ipaddr, lladdr)) | |
179 | val = 3; /* 0-bits */ | |
180 | else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
181 | /* compress IID to 16 bits xxxx::XXXX */ | |
182 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); | |
183 | *hc06_ptr += 2; | |
184 | val = 2; /* 16-bits */ | |
185 | } else { | |
186 | /* do not compress IID => xxxx::IID */ | |
187 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); | |
188 | *hc06_ptr += 8; | |
189 | val = 1; /* 64-bits */ | |
190 | } | |
191 | ||
192 | return rol8(val, shift); | |
193 | } | |
194 | ||
195 | static void | |
196 | lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr) | |
197 | { | |
2d319508 | 198 | memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN); |
44331fe2 AS |
199 | /* second bit-flip (Universe/Local) is done according RFC2464 */ |
200 | ipaddr->s6_addr[8] ^= 0x02; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Uncompress addresses based on a prefix and a postfix with zeroes in | |
205 | * between. If the postfix is zero in length it will use the link address | |
206 | * to configure the IP address (autoconf style). | |
207 | * pref_post_count takes a byte where the first nibble specify prefix count | |
208 | * and the second postfix count (NOTE: 15/0xf => 16 bytes copy). | |
209 | */ | |
210 | static int | |
211 | lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr, | |
212 | u8 const *prefix, u8 pref_post_count, unsigned char *lladdr) | |
213 | { | |
214 | u8 prefcount = pref_post_count >> 4; | |
215 | u8 postcount = pref_post_count & 0x0f; | |
216 | ||
217 | /* full nibble 15 => 16 */ | |
218 | prefcount = (prefcount == 15 ? 16 : prefcount); | |
219 | postcount = (postcount == 15 ? 16 : postcount); | |
220 | ||
221 | if (lladdr) | |
222 | lowpan_raw_dump_inline(__func__, "linklocal address", | |
2d319508 | 223 | lladdr, IEEE802154_ADDR_LEN); |
44331fe2 AS |
224 | if (prefcount > 0) |
225 | memcpy(ipaddr, prefix, prefcount); | |
226 | ||
227 | if (prefcount + postcount < 16) | |
228 | memset(&ipaddr->s6_addr[prefcount], 0, | |
229 | 16 - (prefcount + postcount)); | |
230 | ||
231 | if (postcount > 0) { | |
232 | memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount); | |
233 | skb_pull(skb, postcount); | |
234 | } else if (prefcount > 0) { | |
235 | if (lladdr == NULL) | |
236 | return -EINVAL; | |
237 | ||
238 | /* no IID based configuration if no prefix and no data */ | |
239 | lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr); | |
240 | } | |
241 | ||
e71094f9 | 242 | pr_debug("uncompressing %d + %d => ", prefcount, postcount); |
44331fe2 AS |
243 | lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
3bd5b958 | 248 | static void |
249 | lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) | |
250 | { | |
251 | struct udphdr *uh = udp_hdr(skb); | |
252 | ||
3bd5b958 | 253 | if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) == |
254 | LOWPAN_NHC_UDP_4BIT_PORT) && | |
255 | ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) == | |
256 | LOWPAN_NHC_UDP_4BIT_PORT)) { | |
e71094f9 | 257 | pr_debug("UDP header: both ports compression to 4 bits\n"); |
3bd5b958 | 258 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11; |
259 | **(hc06_ptr + 1) = /* subtraction is faster */ | |
260 | (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) + | |
261 | ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4)); | |
262 | *hc06_ptr += 2; | |
263 | } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) == | |
264 | LOWPAN_NHC_UDP_8BIT_PORT) { | |
e71094f9 | 265 | pr_debug("UDP header: remove 8 bits of dest\n"); |
3bd5b958 | 266 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01; |
267 | memcpy(*hc06_ptr + 1, &uh->source, 2); | |
268 | **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT); | |
269 | *hc06_ptr += 4; | |
270 | } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) == | |
271 | LOWPAN_NHC_UDP_8BIT_PORT) { | |
e71094f9 | 272 | pr_debug("UDP header: remove 8 bits of source\n"); |
3bd5b958 | 273 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10; |
274 | memcpy(*hc06_ptr + 1, &uh->dest, 2); | |
275 | **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT); | |
276 | *hc06_ptr += 4; | |
277 | } else { | |
e71094f9 | 278 | pr_debug("UDP header: can't compress\n"); |
3bd5b958 | 279 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00; |
280 | memcpy(*hc06_ptr + 1, &uh->source, 2); | |
281 | memcpy(*hc06_ptr + 3, &uh->dest, 2); | |
282 | *hc06_ptr += 5; | |
283 | } | |
284 | ||
285 | /* checksum is always inline */ | |
286 | memcpy(*hc06_ptr, &uh->check, 2); | |
287 | *hc06_ptr += 2; | |
288 | } | |
289 | ||
c5d3687f | 290 | static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val) |
44331fe2 | 291 | { |
c5d3687f | 292 | if (unlikely(!pskb_may_pull(skb, 1))) |
293 | return -EINVAL; | |
44331fe2 | 294 | |
c5d3687f | 295 | *val = skb->data[0]; |
44331fe2 AS |
296 | skb_pull(skb, 1); |
297 | ||
c5d3687f | 298 | return 0; |
44331fe2 AS |
299 | } |
300 | ||
c5d3687f | 301 | static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val) |
719269af | 302 | { |
c5d3687f | 303 | if (unlikely(!pskb_may_pull(skb, 2))) |
304 | return -EINVAL; | |
719269af | 305 | |
c5d3687f | 306 | *val = skb->data[0] | (skb->data[1] << 8); |
719269af | 307 | skb_pull(skb, 2); |
c5d3687f | 308 | |
309 | return 0; | |
719269af | 310 | } |
311 | ||
f8b1b5d2 | 312 | static int |
313 | lowpan_uncompress_udp_header(struct sk_buff *skb) | |
314 | { | |
315 | struct udphdr *uh = udp_hdr(skb); | |
316 | u8 tmp; | |
317 | ||
c5d3687f | 318 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
319 | goto err; | |
f8b1b5d2 | 320 | |
321 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { | |
e71094f9 | 322 | pr_debug("UDP header uncompression\n"); |
f8b1b5d2 | 323 | switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { |
324 | case LOWPAN_NHC_UDP_CS_P_00: | |
325 | memcpy(&uh->source, &skb->data[0], 2); | |
326 | memcpy(&uh->dest, &skb->data[2], 2); | |
327 | skb_pull(skb, 4); | |
328 | break; | |
329 | case LOWPAN_NHC_UDP_CS_P_01: | |
330 | memcpy(&uh->source, &skb->data[0], 2); | |
331 | uh->dest = | |
332 | skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT; | |
333 | skb_pull(skb, 3); | |
334 | break; | |
335 | case LOWPAN_NHC_UDP_CS_P_10: | |
336 | uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT; | |
337 | memcpy(&uh->dest, &skb->data[1], 2); | |
338 | skb_pull(skb, 3); | |
339 | break; | |
340 | case LOWPAN_NHC_UDP_CS_P_11: | |
341 | uh->source = | |
342 | LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4); | |
343 | uh->dest = | |
344 | LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f); | |
345 | skb_pull(skb, 1); | |
346 | break; | |
347 | default: | |
e71094f9 | 348 | pr_debug("ERROR: unknown UDP format\n"); |
f8b1b5d2 | 349 | goto err; |
350 | break; | |
351 | } | |
352 | ||
e71094f9 | 353 | pr_debug("uncompressed UDP ports: src = %d, dst = %d\n", |
354 | uh->source, uh->dest); | |
f8b1b5d2 | 355 | |
356 | /* copy checksum */ | |
357 | memcpy(&uh->check, &skb->data[0], 2); | |
358 | skb_pull(skb, 2); | |
359 | } else { | |
e71094f9 | 360 | pr_debug("ERROR: unsupported NH format\n"); |
f8b1b5d2 | 361 | goto err; |
362 | } | |
363 | ||
364 | return 0; | |
365 | err: | |
366 | return -EINVAL; | |
367 | } | |
368 | ||
44331fe2 AS |
369 | static int lowpan_header_create(struct sk_buff *skb, |
370 | struct net_device *dev, | |
371 | unsigned short type, const void *_daddr, | |
95c96174 | 372 | const void *_saddr, unsigned int len) |
44331fe2 AS |
373 | { |
374 | u8 tmp, iphc0, iphc1, *hc06_ptr; | |
375 | struct ipv6hdr *hdr; | |
376 | const u8 *saddr = _saddr; | |
377 | const u8 *daddr = _daddr; | |
378 | u8 *head; | |
379 | struct ieee802154_addr sa, da; | |
380 | ||
381 | if (type != ETH_P_IPV6) | |
382 | return 0; | |
383 | /* TODO: | |
384 | * if this package isn't ipv6 one, where should it be routed? | |
385 | */ | |
386 | head = kzalloc(100, GFP_KERNEL); | |
387 | if (head == NULL) | |
388 | return -ENOMEM; | |
389 | ||
390 | hdr = ipv6_hdr(skb); | |
391 | hc06_ptr = head + 2; | |
392 | ||
e71094f9 | 393 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" |
394 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version, | |
395 | ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit); | |
44331fe2 AS |
396 | |
397 | lowpan_raw_dump_table(__func__, "raw skb network header dump", | |
398 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
399 | ||
400 | if (!saddr) | |
401 | saddr = dev->dev_addr; | |
402 | ||
403 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
404 | ||
405 | /* | |
406 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
407 | * we sometimes use |= | |
408 | * If the field is 0, and the current bit value in memory is 1, | |
409 | * this does not work. We therefore reset the IPHC encoding here | |
410 | */ | |
411 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
412 | iphc1 = 0; | |
413 | ||
414 | /* TODO: context lookup */ | |
415 | ||
416 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
417 | ||
418 | /* | |
419 | * Traffic class, flow label | |
420 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
421 | * We have to process both in the same time as the offset of traffic | |
422 | * class depends on the presence of version and flow label | |
423 | */ | |
424 | ||
425 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
426 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
427 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
428 | ||
429 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
430 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
431 | /* flow label can be compressed */ | |
432 | iphc0 |= LOWPAN_IPHC_FL_C; | |
433 | if ((hdr->priority == 0) && | |
434 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
435 | /* compress (elide) all */ | |
436 | iphc0 |= LOWPAN_IPHC_TC_C; | |
437 | } else { | |
438 | /* compress only the flow label */ | |
439 | *hc06_ptr = tmp; | |
440 | hc06_ptr += 1; | |
441 | } | |
442 | } else { | |
443 | /* Flow label cannot be compressed */ | |
444 | if ((hdr->priority == 0) && | |
445 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
446 | /* compress only traffic class */ | |
447 | iphc0 |= LOWPAN_IPHC_TC_C; | |
448 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
449 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
450 | hc06_ptr += 3; | |
451 | } else { | |
452 | /* compress nothing */ | |
453 | memcpy(hc06_ptr, &hdr, 4); | |
454 | /* replace the top byte with new ECN | DSCP format */ | |
455 | *hc06_ptr = tmp; | |
456 | hc06_ptr += 4; | |
457 | } | |
458 | } | |
459 | ||
460 | /* NOTE: payload length is always compressed */ | |
461 | ||
462 | /* Next Header is compress if UDP */ | |
463 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
464 | iphc0 |= LOWPAN_IPHC_NH_C; | |
465 | ||
44331fe2 AS |
466 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { |
467 | *hc06_ptr = hdr->nexthdr; | |
468 | hc06_ptr += 1; | |
469 | } | |
470 | ||
471 | /* | |
472 | * Hop limit | |
473 | * if 1: compress, encoding is 01 | |
474 | * if 64: compress, encoding is 10 | |
475 | * if 255: compress, encoding is 11 | |
476 | * else do not compress | |
477 | */ | |
478 | switch (hdr->hop_limit) { | |
479 | case 1: | |
480 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
481 | break; | |
482 | case 64: | |
483 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
484 | break; | |
485 | case 255: | |
486 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
487 | break; | |
488 | default: | |
489 | *hc06_ptr = hdr->hop_limit; | |
5c00c0cb | 490 | hc06_ptr += 1; |
44331fe2 AS |
491 | break; |
492 | } | |
493 | ||
494 | /* source address compression */ | |
495 | if (is_addr_unspecified(&hdr->saddr)) { | |
e71094f9 | 496 | pr_debug("source address is unspecified, setting SAC\n"); |
44331fe2 AS |
497 | iphc1 |= LOWPAN_IPHC_SAC; |
498 | /* TODO: context lookup */ | |
499 | } else if (is_addr_link_local(&hdr->saddr)) { | |
e71094f9 | 500 | pr_debug("source address is link-local\n"); |
44331fe2 AS |
501 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
502 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); | |
503 | } else { | |
e71094f9 | 504 | pr_debug("send the full source address\n"); |
44331fe2 AS |
505 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); |
506 | hc06_ptr += 16; | |
507 | } | |
508 | ||
509 | /* destination address compression */ | |
510 | if (is_addr_mcast(&hdr->daddr)) { | |
e71094f9 | 511 | pr_debug("destination address is multicast: "); |
44331fe2 AS |
512 | iphc1 |= LOWPAN_IPHC_M; |
513 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
514 | pr_debug("compressed to 1 octet\n"); | |
515 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
516 | /* use last byte */ | |
517 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
518 | hc06_ptr += 1; | |
519 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
520 | pr_debug("compressed to 4 octets\n"); | |
521 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
522 | /* second byte + the last three */ | |
523 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
524 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
525 | hc06_ptr += 4; | |
526 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
527 | pr_debug("compressed to 6 octets\n"); | |
528 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
529 | /* second byte + the last five */ | |
530 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
531 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
532 | hc06_ptr += 6; | |
533 | } else { | |
534 | pr_debug("using full address\n"); | |
535 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
536 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
537 | hc06_ptr += 16; | |
538 | } | |
539 | } else { | |
44331fe2 AS |
540 | /* TODO: context lookup */ |
541 | if (is_addr_link_local(&hdr->daddr)) { | |
e71094f9 | 542 | pr_debug("dest address is unicast and link-local\n"); |
44331fe2 AS |
543 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
544 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); | |
545 | } else { | |
e71094f9 | 546 | pr_debug("dest address is unicast: using full one\n"); |
44331fe2 AS |
547 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); |
548 | hc06_ptr += 16; | |
549 | } | |
550 | } | |
551 | ||
3bd5b958 | 552 | /* UDP header compression */ |
553 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
554 | lowpan_compress_udp_header(&hc06_ptr, skb); | |
44331fe2 AS |
555 | |
556 | head[0] = iphc0; | |
557 | head[1] = iphc1; | |
558 | ||
559 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
560 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
561 | ||
562 | kfree(head); | |
563 | ||
564 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
565 | skb->len); | |
566 | ||
567 | /* | |
568 | * NOTE1: I'm still unsure about the fact that compression and WPAN | |
569 | * header are created here and not later in the xmit. So wait for | |
570 | * an opinion of net maintainers. | |
571 | */ | |
572 | /* | |
573 | * NOTE2: to be absolutely correct, we must derive PANid information | |
574 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
575 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
576 | */ | |
577 | { | |
578 | /* prepare wpan address data */ | |
579 | sa.addr_type = IEEE802154_ADDR_LONG; | |
580 | sa.pan_id = 0xff; | |
581 | ||
582 | da.addr_type = IEEE802154_ADDR_LONG; | |
583 | da.pan_id = 0xff; | |
584 | ||
585 | memcpy(&(da.hwaddr), daddr, 8); | |
586 | memcpy(&(sa.hwaddr), saddr, 8); | |
587 | ||
588 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; | |
719269af | 589 | |
44331fe2 AS |
590 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
591 | type, (void *)&da, (void *)&sa, skb->len); | |
592 | } | |
593 | } | |
594 | ||
595 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) | |
596 | { | |
597 | struct sk_buff *new; | |
598 | struct lowpan_dev_record *entry; | |
599 | int stat = NET_RX_SUCCESS; | |
600 | ||
601 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
dcef1151 | 602 | GFP_ATOMIC); |
44331fe2 AS |
603 | kfree_skb(skb); |
604 | ||
dcef1151 | 605 | if (!new) |
44331fe2 AS |
606 | return -ENOMEM; |
607 | ||
608 | skb_push(new, sizeof(struct ipv6hdr)); | |
609 | skb_reset_network_header(new); | |
610 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
611 | ||
612 | new->protocol = htons(ETH_P_IPV6); | |
613 | new->pkt_type = PACKET_HOST; | |
614 | ||
615 | rcu_read_lock(); | |
616 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
617 | if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) { | |
dcef1151 | 618 | skb = skb_copy(new, GFP_ATOMIC); |
619 | if (!skb) { | |
620 | stat = -ENOMEM; | |
621 | break; | |
622 | } | |
44331fe2 | 623 | |
dcef1151 | 624 | skb->dev = entry->ldev; |
625 | stat = netif_rx(skb); | |
44331fe2 AS |
626 | } |
627 | rcu_read_unlock(); | |
628 | ||
629 | kfree_skb(new); | |
630 | ||
631 | return stat; | |
632 | } | |
633 | ||
719269af | 634 | static void lowpan_fragment_timer_expired(unsigned long entry_addr) |
635 | { | |
636 | struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; | |
637 | ||
e71094f9 | 638 | pr_debug("timer expired for frame with tag %d\n", entry->tag); |
719269af | 639 | |
640 | spin_lock(&flist_lock); | |
641 | list_del(&entry->list); | |
642 | spin_unlock(&flist_lock); | |
643 | ||
644 | dev_kfree_skb(entry->skb); | |
645 | kfree(entry); | |
646 | } | |
647 | ||
c2e94d73 | 648 | static struct lowpan_fragment * |
649 | lowpan_alloc_new_frame(struct sk_buff *skb, u8 iphc0, u8 len, u8 tag) | |
650 | { | |
651 | struct lowpan_fragment *frame; | |
652 | ||
653 | frame = kzalloc(sizeof(struct lowpan_fragment), | |
654 | GFP_ATOMIC); | |
655 | if (!frame) | |
656 | goto frame_err; | |
657 | ||
658 | INIT_LIST_HEAD(&frame->list); | |
659 | ||
660 | frame->length = (iphc0 & 7) | (len << 3); | |
661 | frame->tag = tag; | |
662 | ||
663 | /* allocate buffer for frame assembling */ | |
664 | frame->skb = alloc_skb(frame->length + | |
665 | sizeof(struct ipv6hdr), GFP_ATOMIC); | |
666 | ||
667 | if (!frame->skb) | |
668 | goto skb_err; | |
669 | ||
670 | frame->skb->priority = skb->priority; | |
671 | frame->skb->dev = skb->dev; | |
672 | ||
673 | /* reserve headroom for uncompressed ipv6 header */ | |
674 | skb_reserve(frame->skb, sizeof(struct ipv6hdr)); | |
675 | skb_put(frame->skb, frame->length); | |
676 | ||
677 | init_timer(&frame->timer); | |
678 | /* time out is the same as for ipv6 - 60 sec */ | |
679 | frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; | |
680 | frame->timer.data = (unsigned long)frame; | |
681 | frame->timer.function = lowpan_fragment_timer_expired; | |
682 | ||
683 | add_timer(&frame->timer); | |
684 | ||
685 | list_add_tail(&frame->list, &lowpan_fragments); | |
686 | ||
687 | return frame; | |
688 | ||
689 | skb_err: | |
690 | kfree(frame); | |
691 | frame_err: | |
692 | return NULL; | |
693 | } | |
694 | ||
44331fe2 AS |
695 | static int |
696 | lowpan_process_data(struct sk_buff *skb) | |
697 | { | |
698 | struct ipv6hdr hdr; | |
699 | u8 tmp, iphc0, iphc1, num_context = 0; | |
700 | u8 *_saddr, *_daddr; | |
701 | int err; | |
702 | ||
703 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
704 | skb->len); | |
705 | /* at least two bytes will be used for the encoding */ | |
706 | if (skb->len < 2) | |
707 | goto drop; | |
c5d3687f | 708 | |
709 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
710 | goto drop; | |
719269af | 711 | |
712 | /* fragments assembling */ | |
713 | switch (iphc0 & LOWPAN_DISPATCH_MASK) { | |
714 | case LOWPAN_DISPATCH_FRAG1: | |
715 | case LOWPAN_DISPATCH_FRAGN: | |
716 | { | |
717 | struct lowpan_fragment *frame; | |
718 | u8 len, offset; | |
719 | u16 tag; | |
720 | bool found = false; | |
721 | ||
c5d3687f | 722 | if (lowpan_fetch_skb_u8(skb, &len) || /* frame length */ |
723 | lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */ | |
724 | goto drop; | |
719269af | 725 | |
726 | /* | |
727 | * check if frame assembling with the same tag is | |
728 | * already in progress | |
729 | */ | |
730 | spin_lock(&flist_lock); | |
731 | ||
732 | list_for_each_entry(frame, &lowpan_fragments, list) | |
733 | if (frame->tag == tag) { | |
734 | found = true; | |
735 | break; | |
736 | } | |
737 | ||
738 | /* alloc new frame structure */ | |
739 | if (!found) { | |
c2e94d73 | 740 | frame = lowpan_alloc_new_frame(skb, iphc0, len, tag); |
719269af | 741 | if (!frame) |
742 | goto unlock_and_drop; | |
719269af | 743 | } |
744 | ||
745 | if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) | |
746 | goto unlock_and_drop; | |
747 | ||
c5d3687f | 748 | if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */ |
749 | goto unlock_and_drop; | |
719269af | 750 | |
751 | /* if payload fits buffer, copy it */ | |
752 | if (likely((offset * 8 + skb->len) <= frame->length)) | |
753 | skb_copy_to_linear_data_offset(frame->skb, offset * 8, | |
754 | skb->data, skb->len); | |
755 | else | |
756 | goto unlock_and_drop; | |
757 | ||
758 | frame->bytes_rcv += skb->len; | |
759 | ||
760 | /* frame assembling complete */ | |
761 | if ((frame->bytes_rcv == frame->length) && | |
762 | frame->timer.expires > jiffies) { | |
763 | /* if timer haven't expired - first of all delete it */ | |
764 | del_timer(&frame->timer); | |
765 | list_del(&frame->list); | |
766 | spin_unlock(&flist_lock); | |
767 | ||
768 | dev_kfree_skb(skb); | |
769 | skb = frame->skb; | |
770 | kfree(frame); | |
c5d3687f | 771 | |
772 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
747cf6ed | 773 | goto drop; |
c5d3687f | 774 | |
719269af | 775 | break; |
776 | } | |
777 | spin_unlock(&flist_lock); | |
778 | ||
779 | return kfree_skb(skb), 0; | |
780 | } | |
781 | default: | |
782 | break; | |
783 | } | |
784 | ||
c5d3687f | 785 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
786 | goto drop; | |
44331fe2 AS |
787 | |
788 | _saddr = mac_cb(skb)->sa.hwaddr; | |
789 | _daddr = mac_cb(skb)->da.hwaddr; | |
790 | ||
e71094f9 | 791 | pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1); |
44331fe2 AS |
792 | |
793 | /* another if the CID flag is set */ | |
794 | if (iphc1 & LOWPAN_IPHC_CID) { | |
e71094f9 | 795 | pr_debug("CID flag is set, increase header with one\n"); |
c5d3687f | 796 | if (lowpan_fetch_skb_u8(skb, &num_context)) |
44331fe2 | 797 | goto drop; |
44331fe2 AS |
798 | } |
799 | ||
800 | hdr.version = 6; | |
801 | ||
802 | /* Traffic Class and Flow Label */ | |
803 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
804 | /* | |
805 | * Traffic Class and FLow Label carried in-line | |
806 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
807 | */ | |
808 | case 0: /* 00b */ | |
c5d3687f | 809 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 810 | goto drop; |
c5d3687f | 811 | |
44331fe2 AS |
812 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); |
813 | skb_pull(skb, 3); | |
814 | hdr.priority = ((tmp >> 2) & 0x0f); | |
815 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
816 | (hdr.flow_lbl[0] & 0x0f); | |
817 | break; | |
818 | /* | |
819 | * Traffic class carried in-line | |
820 | * ECN + DSCP (1 byte), Flow Label is elided | |
821 | */ | |
822 | case 1: /* 10b */ | |
c5d3687f | 823 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 824 | goto drop; |
c5d3687f | 825 | |
44331fe2 AS |
826 | hdr.priority = ((tmp >> 2) & 0x0f); |
827 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
828 | hdr.flow_lbl[1] = 0; | |
829 | hdr.flow_lbl[2] = 0; | |
830 | break; | |
831 | /* | |
832 | * Flow Label carried in-line | |
833 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
834 | */ | |
835 | case 2: /* 01b */ | |
c5d3687f | 836 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 837 | goto drop; |
c5d3687f | 838 | |
44331fe2 AS |
839 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); |
840 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
841 | skb_pull(skb, 2); | |
842 | break; | |
843 | /* Traffic Class and Flow Label are elided */ | |
844 | case 3: /* 11b */ | |
845 | hdr.priority = 0; | |
846 | hdr.flow_lbl[0] = 0; | |
847 | hdr.flow_lbl[1] = 0; | |
848 | hdr.flow_lbl[2] = 0; | |
849 | break; | |
850 | default: | |
851 | break; | |
852 | } | |
853 | ||
854 | /* Next Header */ | |
855 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
856 | /* Next header is carried inline */ | |
c5d3687f | 857 | if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr))) |
44331fe2 | 858 | goto drop; |
c5d3687f | 859 | |
e71094f9 | 860 | pr_debug("NH flag is set, next header carried inline: %02x\n", |
861 | hdr.nexthdr); | |
44331fe2 AS |
862 | } |
863 | ||
864 | /* Hop Limit */ | |
865 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
866 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
867 | else { | |
c5d3687f | 868 | if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit))) |
44331fe2 | 869 | goto drop; |
44331fe2 AS |
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 */ | |
e71094f9 | 876 | pr_debug("source address stateless compression\n"); |
44331fe2 AS |
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) { | |
e71094f9 | 888 | pr_debug("dest: context-based mcast compression\n"); |
44331fe2 AS |
889 | /* TODO: implement this */ |
890 | } else { | |
891 | u8 prefix[] = {0xff, 0x02}; | |
892 | ||
e71094f9 | 893 | pr_debug("dest: non context-based mcast compression\n"); |
44331fe2 | 894 | if (0 < tmp && tmp < 3) { |
c5d3687f | 895 | if (lowpan_fetch_skb_u8(skb, &prefix[1])) |
44331fe2 | 896 | goto drop; |
44331fe2 AS |
897 | } |
898 | ||
899 | err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix, | |
900 | lowpan_unc_mxconf[tmp], NULL); | |
901 | if (err) | |
902 | goto drop; | |
903 | } | |
904 | } else { | |
e71094f9 | 905 | pr_debug("dest: stateless compression\n"); |
44331fe2 AS |
906 | err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, |
907 | lowpan_unc_llconf[tmp], skb->data); | |
908 | if (err) | |
909 | goto drop; | |
910 | } | |
911 | ||
f8b1b5d2 | 912 | /* UDP data uncompression */ |
913 | if (iphc0 & LOWPAN_IPHC_NH_C) | |
914 | if (lowpan_uncompress_udp_header(skb)) | |
915 | goto drop; | |
44331fe2 AS |
916 | |
917 | /* Not fragmented package */ | |
918 | hdr.payload_len = htons(skb->len); | |
919 | ||
e71094f9 | 920 | pr_debug("skb headroom size = %d, data length = %d\n", |
921 | skb_headroom(skb), skb->len); | |
44331fe2 | 922 | |
e71094f9 | 923 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" |
924 | "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version, | |
44331fe2 AS |
925 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); |
926 | ||
927 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
928 | sizeof(hdr)); | |
929 | return lowpan_skb_deliver(skb, &hdr); | |
719269af | 930 | |
931 | unlock_and_drop: | |
932 | spin_unlock(&flist_lock); | |
44331fe2 | 933 | drop: |
90d0963d | 934 | kfree_skb(skb); |
44331fe2 AS |
935 | return -EINVAL; |
936 | } | |
937 | ||
42c36295 | 938 | static int lowpan_set_address(struct net_device *dev, void *p) |
939 | { | |
940 | struct sockaddr *sa = p; | |
941 | ||
942 | if (netif_running(dev)) | |
943 | return -EBUSY; | |
944 | ||
945 | /* TODO: validate addr */ | |
946 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
719269af | 951 | static int lowpan_get_mac_header_length(struct sk_buff *skb) |
952 | { | |
953 | /* | |
954 | * Currently long addressing mode is supported only, so the overall | |
955 | * header size is 21: | |
956 | * FC SeqNum DPAN DA SA Sec | |
957 | * 2 + 1 + 2 + 8 + 8 + 0 = 21 | |
958 | */ | |
959 | return 21; | |
960 | } | |
961 | ||
962 | static int | |
963 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, | |
964 | int mlen, int plen, int offset) | |
965 | { | |
966 | struct sk_buff *frag; | |
967 | int hlen, ret; | |
968 | ||
969 | /* if payload length is zero, therefore it's a first fragment */ | |
970 | hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE); | |
971 | ||
972 | lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); | |
973 | ||
974 | frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE); | |
975 | if (!frag) | |
976 | return -ENOMEM; | |
977 | ||
978 | frag->priority = skb->priority; | |
979 | frag->dev = skb->dev; | |
980 | ||
981 | /* copy header, MFR and payload */ | |
982 | memcpy(skb_put(frag, mlen), skb->data, mlen); | |
983 | memcpy(skb_put(frag, hlen), head, hlen); | |
984 | ||
985 | if (plen) | |
986 | skb_copy_from_linear_data_offset(skb, offset + mlen, | |
987 | skb_put(frag, plen), plen); | |
988 | ||
989 | lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, | |
990 | frag->len); | |
991 | ||
992 | ret = dev_queue_xmit(frag); | |
993 | ||
719269af | 994 | return ret; |
995 | } | |
996 | ||
997 | static int | |
998 | lowpan_skb_fragmentation(struct sk_buff *skb) | |
999 | { | |
1000 | int err, header_length, payload_length, tag, offset = 0; | |
1001 | u8 head[5]; | |
1002 | ||
1003 | header_length = lowpan_get_mac_header_length(skb); | |
1004 | payload_length = skb->len - header_length; | |
1005 | tag = fragment_tag++; | |
1006 | ||
1007 | /* first fragment header */ | |
1008 | head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7); | |
1009 | head[1] = (payload_length >> 3) & 0xff; | |
1010 | head[2] = tag & 0xff; | |
1011 | head[3] = tag >> 8; | |
1012 | ||
1013 | err = lowpan_fragment_xmit(skb, head, header_length, 0, 0); | |
1014 | ||
1015 | /* next fragment header */ | |
1016 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
1017 | head[0] |= LOWPAN_DISPATCH_FRAGN; | |
1018 | ||
1019 | while ((payload_length - offset > 0) && (err >= 0)) { | |
1020 | int len = LOWPAN_FRAG_SIZE; | |
1021 | ||
1022 | head[4] = offset / 8; | |
1023 | ||
1024 | if (payload_length - offset < len) | |
1025 | len = payload_length - offset; | |
1026 | ||
1027 | err = lowpan_fragment_xmit(skb, head, header_length, | |
1028 | len, offset); | |
1029 | offset += len; | |
1030 | } | |
1031 | ||
1032 | return err; | |
1033 | } | |
1034 | ||
44331fe2 AS |
1035 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
1036 | { | |
719269af | 1037 | int err = -1; |
44331fe2 | 1038 | |
e71094f9 | 1039 | pr_debug("package xmit\n"); |
44331fe2 AS |
1040 | |
1041 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
1042 | if (skb->dev == NULL) { | |
e71094f9 | 1043 | pr_debug("ERROR: no real wpan device found\n"); |
719269af | 1044 | goto error; |
1045 | } | |
1046 | ||
1047 | if (skb->len <= IEEE802154_MTU) { | |
44331fe2 | 1048 | err = dev_queue_xmit(skb); |
719269af | 1049 | goto out; |
1050 | } | |
1051 | ||
e71094f9 | 1052 | pr_debug("frame is too big, fragmentation is needed\n"); |
719269af | 1053 | err = lowpan_skb_fragmentation(skb); |
1054 | error: | |
1055 | dev_kfree_skb(skb); | |
1056 | out: | |
1057 | if (err < 0) | |
e71094f9 | 1058 | pr_debug("ERROR: xmit failed\n"); |
44331fe2 AS |
1059 | |
1060 | return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK); | |
1061 | } | |
1062 | ||
1063 | static void lowpan_dev_free(struct net_device *dev) | |
1064 | { | |
1065 | dev_put(lowpan_dev_info(dev)->real_dev); | |
1066 | free_netdev(dev); | |
1067 | } | |
1068 | ||
0848e404 | 1069 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
1070 | { | |
1071 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1072 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); | |
1073 | } | |
1074 | ||
1075 | static u16 lowpan_get_pan_id(const struct net_device *dev) | |
1076 | { | |
1077 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1078 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); | |
1079 | } | |
1080 | ||
1081 | static u16 lowpan_get_short_addr(const struct net_device *dev) | |
1082 | { | |
1083 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1084 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); | |
1085 | } | |
1086 | ||
44331fe2 AS |
1087 | static struct header_ops lowpan_header_ops = { |
1088 | .create = lowpan_header_create, | |
1089 | }; | |
1090 | ||
1091 | static const struct net_device_ops lowpan_netdev_ops = { | |
1092 | .ndo_start_xmit = lowpan_xmit, | |
42c36295 | 1093 | .ndo_set_mac_address = lowpan_set_address, |
44331fe2 AS |
1094 | }; |
1095 | ||
0848e404 | 1096 | static struct ieee802154_mlme_ops lowpan_mlme = { |
1097 | .get_pan_id = lowpan_get_pan_id, | |
1098 | .get_phy = lowpan_get_phy, | |
1099 | .get_short_addr = lowpan_get_short_addr, | |
1100 | }; | |
1101 | ||
44331fe2 AS |
1102 | static void lowpan_setup(struct net_device *dev) |
1103 | { | |
44331fe2 AS |
1104 | dev->addr_len = IEEE802154_ADDR_LEN; |
1105 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
1106 | dev->type = ARPHRD_IEEE802154; | |
44331fe2 AS |
1107 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
1108 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
1109 | dev->needed_tailroom = 2; /* FCS */ | |
1110 | dev->mtu = 1281; | |
1111 | dev->tx_queue_len = 0; | |
4d039f68 | 1112 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
44331fe2 AS |
1113 | dev->watchdog_timeo = 0; |
1114 | ||
1115 | dev->netdev_ops = &lowpan_netdev_ops; | |
1116 | dev->header_ops = &lowpan_header_ops; | |
0848e404 | 1117 | dev->ml_priv = &lowpan_mlme; |
44331fe2 AS |
1118 | dev->destructor = lowpan_dev_free; |
1119 | } | |
1120 | ||
1121 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1122 | { | |
44331fe2 AS |
1123 | if (tb[IFLA_ADDRESS]) { |
1124 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
1125 | return -EINVAL; | |
1126 | } | |
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
1131 | struct packet_type *pt, struct net_device *orig_dev) | |
1132 | { | |
1133 | if (!netif_running(dev)) | |
1134 | goto drop; | |
1135 | ||
1136 | if (dev->type != ARPHRD_IEEE802154) | |
1137 | goto drop; | |
1138 | ||
1139 | /* check that it's our buffer */ | |
719269af | 1140 | switch (skb->data[0] & 0xe0) { |
1141 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
1142 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ | |
1143 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ | |
44331fe2 | 1144 | lowpan_process_data(skb); |
719269af | 1145 | break; |
1146 | default: | |
1147 | break; | |
1148 | } | |
44331fe2 AS |
1149 | |
1150 | return NET_RX_SUCCESS; | |
1151 | ||
1152 | drop: | |
1153 | kfree_skb(skb); | |
1154 | return NET_RX_DROP; | |
1155 | } | |
1156 | ||
1157 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
1158 | struct nlattr *tb[], struct nlattr *data[]) | |
1159 | { | |
1160 | struct net_device *real_dev; | |
1161 | struct lowpan_dev_record *entry; | |
1162 | ||
e71094f9 | 1163 | pr_debug("adding new link\n"); |
44331fe2 AS |
1164 | |
1165 | if (!tb[IFLA_LINK]) | |
1166 | return -EINVAL; | |
1167 | /* find and hold real wpan device */ | |
1168 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
1169 | if (!real_dev) | |
1170 | return -ENODEV; | |
1171 | ||
1172 | lowpan_dev_info(dev)->real_dev = real_dev; | |
1173 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); | |
1174 | ||
1175 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); | |
dc00fd44 DC |
1176 | if (!entry) { |
1177 | dev_put(real_dev); | |
1178 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 1179 | return -ENOMEM; |
dc00fd44 | 1180 | } |
44331fe2 AS |
1181 | |
1182 | entry->ldev = dev; | |
1183 | ||
1184 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1185 | INIT_LIST_HEAD(&entry->list); | |
1186 | list_add_tail(&entry->list, &lowpan_devices); | |
1187 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1188 | ||
768f7c7c | 1189 | spin_lock_init(&flist_lock); |
1190 | ||
44331fe2 AS |
1191 | register_netdevice(dev); |
1192 | ||
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
1197 | { | |
1198 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
1199 | struct net_device *real_dev = lowpan_dev->real_dev; | |
8deff4af | 1200 | struct lowpan_dev_record *entry, *tmp; |
1201 | struct lowpan_fragment *frame, *tframe; | |
44331fe2 AS |
1202 | |
1203 | ASSERT_RTNL(); | |
1204 | ||
8deff4af | 1205 | spin_lock(&flist_lock); |
1206 | list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) { | |
1207 | del_timer(&frame->timer); | |
1208 | list_del(&frame->list); | |
1209 | dev_kfree_skb(frame->skb); | |
1210 | kfree(frame); | |
1211 | } | |
1212 | spin_unlock(&flist_lock); | |
1213 | ||
44331fe2 | 1214 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
aec9db35 | 1215 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
1216 | if (entry->ldev == dev) { |
1217 | list_del(&entry->list); | |
1218 | kfree(entry); | |
1219 | } | |
aec9db35 | 1220 | } |
44331fe2 AS |
1221 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
1222 | ||
1223 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
1224 | ||
1225 | unregister_netdevice_queue(dev, head); | |
1226 | ||
1227 | dev_put(real_dev); | |
1228 | } | |
1229 | ||
1230 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
1231 | .kind = "lowpan", | |
1232 | .priv_size = sizeof(struct lowpan_dev_info), | |
1233 | .setup = lowpan_setup, | |
1234 | .newlink = lowpan_newlink, | |
1235 | .dellink = lowpan_dellink, | |
1236 | .validate = lowpan_validate, | |
1237 | }; | |
1238 | ||
1239 | static inline int __init lowpan_netlink_init(void) | |
1240 | { | |
1241 | return rtnl_link_register(&lowpan_link_ops); | |
1242 | } | |
1243 | ||
1244 | static inline void __init lowpan_netlink_fini(void) | |
1245 | { | |
1246 | rtnl_link_unregister(&lowpan_link_ops); | |
1247 | } | |
1248 | ||
1249 | static struct packet_type lowpan_packet_type = { | |
1250 | .type = __constant_htons(ETH_P_IEEE802154), | |
1251 | .func = lowpan_rcv, | |
1252 | }; | |
1253 | ||
1254 | static int __init lowpan_init_module(void) | |
1255 | { | |
1256 | int err = 0; | |
1257 | ||
44331fe2 AS |
1258 | err = lowpan_netlink_init(); |
1259 | if (err < 0) | |
1260 | goto out; | |
1261 | ||
1262 | dev_add_pack(&lowpan_packet_type); | |
1263 | out: | |
1264 | return err; | |
1265 | } | |
1266 | ||
1267 | static void __exit lowpan_cleanup_module(void) | |
1268 | { | |
44331fe2 AS |
1269 | lowpan_netlink_fini(); |
1270 | ||
1271 | dev_remove_pack(&lowpan_packet_type); | |
1272 | } | |
1273 | ||
1274 | module_init(lowpan_init_module); | |
1275 | module_exit(lowpan_cleanup_module); | |
1276 | MODULE_LICENSE("GPL"); | |
1277 | MODULE_ALIAS_RTNL_LINK("lowpan"); |