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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 */ | |
d4ac3236 | 107 | unsigned short fragment_tag; |
44331fe2 AS |
108 | }; |
109 | ||
110 | struct lowpan_dev_record { | |
111 | struct net_device *ldev; | |
112 | struct list_head list; | |
113 | }; | |
114 | ||
719269af | 115 | struct lowpan_fragment { |
116 | struct sk_buff *skb; /* skb to be assembled */ | |
719269af | 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 | ||
719269af | 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; | |
fc4e98db | 380 | u8 head[100]; |
44331fe2 AS |
381 | struct ieee802154_addr sa, da; |
382 | ||
fc4e98db AA |
383 | /* TODO: |
384 | * if this package isn't ipv6 one, where should it be routed? | |
385 | */ | |
44331fe2 AS |
386 | if (type != ETH_P_IPV6) |
387 | return 0; | |
44331fe2 AS |
388 | |
389 | hdr = ipv6_hdr(skb); | |
390 | hc06_ptr = head + 2; | |
391 | ||
e71094f9 | 392 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" |
393 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version, | |
394 | ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit); | |
44331fe2 AS |
395 | |
396 | lowpan_raw_dump_table(__func__, "raw skb network header dump", | |
397 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
398 | ||
399 | if (!saddr) | |
400 | saddr = dev->dev_addr; | |
401 | ||
402 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
403 | ||
404 | /* | |
405 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
406 | * we sometimes use |= | |
407 | * If the field is 0, and the current bit value in memory is 1, | |
408 | * this does not work. We therefore reset the IPHC encoding here | |
409 | */ | |
410 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
411 | iphc1 = 0; | |
412 | ||
413 | /* TODO: context lookup */ | |
414 | ||
415 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
416 | ||
417 | /* | |
418 | * Traffic class, flow label | |
419 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
420 | * We have to process both in the same time as the offset of traffic | |
421 | * class depends on the presence of version and flow label | |
422 | */ | |
423 | ||
424 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
425 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
426 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
427 | ||
428 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
429 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
430 | /* flow label can be compressed */ | |
431 | iphc0 |= LOWPAN_IPHC_FL_C; | |
432 | if ((hdr->priority == 0) && | |
433 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
434 | /* compress (elide) all */ | |
435 | iphc0 |= LOWPAN_IPHC_TC_C; | |
436 | } else { | |
437 | /* compress only the flow label */ | |
438 | *hc06_ptr = tmp; | |
439 | hc06_ptr += 1; | |
440 | } | |
441 | } else { | |
442 | /* Flow label cannot be compressed */ | |
443 | if ((hdr->priority == 0) && | |
444 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
445 | /* compress only traffic class */ | |
446 | iphc0 |= LOWPAN_IPHC_TC_C; | |
447 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
448 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
449 | hc06_ptr += 3; | |
450 | } else { | |
451 | /* compress nothing */ | |
452 | memcpy(hc06_ptr, &hdr, 4); | |
453 | /* replace the top byte with new ECN | DSCP format */ | |
454 | *hc06_ptr = tmp; | |
455 | hc06_ptr += 4; | |
456 | } | |
457 | } | |
458 | ||
459 | /* NOTE: payload length is always compressed */ | |
460 | ||
461 | /* Next Header is compress if UDP */ | |
462 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
463 | iphc0 |= LOWPAN_IPHC_NH_C; | |
464 | ||
44331fe2 AS |
465 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { |
466 | *hc06_ptr = hdr->nexthdr; | |
467 | hc06_ptr += 1; | |
468 | } | |
469 | ||
470 | /* | |
471 | * Hop limit | |
472 | * if 1: compress, encoding is 01 | |
473 | * if 64: compress, encoding is 10 | |
474 | * if 255: compress, encoding is 11 | |
475 | * else do not compress | |
476 | */ | |
477 | switch (hdr->hop_limit) { | |
478 | case 1: | |
479 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
480 | break; | |
481 | case 64: | |
482 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
483 | break; | |
484 | case 255: | |
485 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
486 | break; | |
487 | default: | |
488 | *hc06_ptr = hdr->hop_limit; | |
5c00c0cb | 489 | hc06_ptr += 1; |
44331fe2 AS |
490 | break; |
491 | } | |
492 | ||
493 | /* source address compression */ | |
494 | if (is_addr_unspecified(&hdr->saddr)) { | |
e71094f9 | 495 | pr_debug("source address is unspecified, setting SAC\n"); |
44331fe2 AS |
496 | iphc1 |= LOWPAN_IPHC_SAC; |
497 | /* TODO: context lookup */ | |
498 | } else if (is_addr_link_local(&hdr->saddr)) { | |
e71094f9 | 499 | pr_debug("source address is link-local\n"); |
44331fe2 AS |
500 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
501 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); | |
502 | } else { | |
e71094f9 | 503 | pr_debug("send the full source address\n"); |
44331fe2 AS |
504 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); |
505 | hc06_ptr += 16; | |
506 | } | |
507 | ||
508 | /* destination address compression */ | |
509 | if (is_addr_mcast(&hdr->daddr)) { | |
e71094f9 | 510 | pr_debug("destination address is multicast: "); |
44331fe2 AS |
511 | iphc1 |= LOWPAN_IPHC_M; |
512 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
513 | pr_debug("compressed to 1 octet\n"); | |
514 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
515 | /* use last byte */ | |
516 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
517 | hc06_ptr += 1; | |
518 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
519 | pr_debug("compressed to 4 octets\n"); | |
520 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
521 | /* second byte + the last three */ | |
522 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
523 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
524 | hc06_ptr += 4; | |
525 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
526 | pr_debug("compressed to 6 octets\n"); | |
527 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
528 | /* second byte + the last five */ | |
529 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
530 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
531 | hc06_ptr += 6; | |
532 | } else { | |
533 | pr_debug("using full address\n"); | |
534 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
535 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
536 | hc06_ptr += 16; | |
537 | } | |
538 | } else { | |
44331fe2 AS |
539 | /* TODO: context lookup */ |
540 | if (is_addr_link_local(&hdr->daddr)) { | |
e71094f9 | 541 | pr_debug("dest address is unicast and link-local\n"); |
44331fe2 AS |
542 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
543 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); | |
544 | } else { | |
e71094f9 | 545 | pr_debug("dest address is unicast: using full one\n"); |
44331fe2 AS |
546 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); |
547 | hc06_ptr += 16; | |
548 | } | |
549 | } | |
550 | ||
3bd5b958 | 551 | /* UDP header compression */ |
552 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
553 | lowpan_compress_udp_header(&hc06_ptr, skb); | |
44331fe2 AS |
554 | |
555 | head[0] = iphc0; | |
556 | head[1] = iphc1; | |
557 | ||
558 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
559 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
560 | ||
44331fe2 AS |
561 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, |
562 | skb->len); | |
563 | ||
564 | /* | |
565 | * NOTE1: I'm still unsure about the fact that compression and WPAN | |
566 | * header are created here and not later in the xmit. So wait for | |
567 | * an opinion of net maintainers. | |
568 | */ | |
569 | /* | |
570 | * NOTE2: to be absolutely correct, we must derive PANid information | |
571 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
572 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
573 | */ | |
574 | { | |
58ef67c3 TC |
575 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; |
576 | ||
44331fe2 AS |
577 | /* prepare wpan address data */ |
578 | sa.addr_type = IEEE802154_ADDR_LONG; | |
579 | sa.pan_id = 0xff; | |
44331fe2 AS |
580 | memcpy(&(sa.hwaddr), saddr, 8); |
581 | ||
58ef67c3 TC |
582 | da.pan_id = 0xff; |
583 | /* | |
584 | * if the destination address is the broadcast address, use the | |
585 | * corresponding short address | |
586 | */ | |
587 | if (lowpan_is_addr_broadcast(daddr)) { | |
588 | da.addr_type = IEEE802154_ADDR_SHORT; | |
589 | da.short_addr = IEEE802154_ADDR_BROADCAST; | |
590 | } else { | |
591 | da.addr_type = IEEE802154_ADDR_LONG; | |
592 | memcpy(&(da.hwaddr), daddr, 8); | |
719269af | 593 | |
58ef67c3 | 594 | /* request acknowledgment */ |
f333a15a | 595 | mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; |
58ef67c3 | 596 | } |
f333a15a | 597 | |
44331fe2 AS |
598 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
599 | type, (void *)&da, (void *)&sa, skb->len); | |
600 | } | |
601 | } | |
602 | ||
0c446212 AO |
603 | static int lowpan_give_skb_to_devices(struct sk_buff *skb) |
604 | { | |
605 | struct lowpan_dev_record *entry; | |
606 | struct sk_buff *skb_cp; | |
607 | int stat = NET_RX_SUCCESS; | |
608 | ||
609 | rcu_read_lock(); | |
610 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
611 | if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) { | |
612 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
613 | if (!skb_cp) { | |
614 | stat = -ENOMEM; | |
615 | break; | |
616 | } | |
617 | ||
618 | skb_cp->dev = entry->ldev; | |
619 | stat = netif_rx(skb_cp); | |
620 | } | |
621 | rcu_read_unlock(); | |
622 | ||
623 | return stat; | |
624 | } | |
625 | ||
44331fe2 AS |
626 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) |
627 | { | |
628 | struct sk_buff *new; | |
44331fe2 AS |
629 | int stat = NET_RX_SUCCESS; |
630 | ||
631 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
dcef1151 | 632 | GFP_ATOMIC); |
44331fe2 AS |
633 | kfree_skb(skb); |
634 | ||
dcef1151 | 635 | if (!new) |
44331fe2 AS |
636 | return -ENOMEM; |
637 | ||
638 | skb_push(new, sizeof(struct ipv6hdr)); | |
639 | skb_reset_network_header(new); | |
640 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
641 | ||
642 | new->protocol = htons(ETH_P_IPV6); | |
643 | new->pkt_type = PACKET_HOST; | |
644 | ||
0c446212 | 645 | stat = lowpan_give_skb_to_devices(new); |
44331fe2 AS |
646 | |
647 | kfree_skb(new); | |
648 | ||
649 | return stat; | |
650 | } | |
651 | ||
719269af | 652 | static void lowpan_fragment_timer_expired(unsigned long entry_addr) |
653 | { | |
654 | struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; | |
655 | ||
e71094f9 | 656 | pr_debug("timer expired for frame with tag %d\n", entry->tag); |
719269af | 657 | |
719269af | 658 | list_del(&entry->list); |
719269af | 659 | dev_kfree_skb(entry->skb); |
660 | kfree(entry); | |
661 | } | |
662 | ||
c2e94d73 | 663 | static struct lowpan_fragment * |
d991b98f | 664 | lowpan_alloc_new_frame(struct sk_buff *skb, u16 len, u16 tag) |
c2e94d73 | 665 | { |
666 | struct lowpan_fragment *frame; | |
667 | ||
668 | frame = kzalloc(sizeof(struct lowpan_fragment), | |
669 | GFP_ATOMIC); | |
670 | if (!frame) | |
671 | goto frame_err; | |
672 | ||
673 | INIT_LIST_HEAD(&frame->list); | |
674 | ||
5e96855f | 675 | frame->length = len; |
c2e94d73 | 676 | frame->tag = tag; |
677 | ||
678 | /* allocate buffer for frame assembling */ | |
79ff1db6 | 679 | frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length + |
680 | sizeof(struct ipv6hdr)); | |
c2e94d73 | 681 | |
682 | if (!frame->skb) | |
683 | goto skb_err; | |
684 | ||
685 | frame->skb->priority = skb->priority; | |
686 | frame->skb->dev = skb->dev; | |
687 | ||
688 | /* reserve headroom for uncompressed ipv6 header */ | |
689 | skb_reserve(frame->skb, sizeof(struct ipv6hdr)); | |
690 | skb_put(frame->skb, frame->length); | |
691 | ||
692 | init_timer(&frame->timer); | |
693 | /* time out is the same as for ipv6 - 60 sec */ | |
694 | frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; | |
695 | frame->timer.data = (unsigned long)frame; | |
696 | frame->timer.function = lowpan_fragment_timer_expired; | |
697 | ||
698 | add_timer(&frame->timer); | |
699 | ||
700 | list_add_tail(&frame->list, &lowpan_fragments); | |
701 | ||
702 | return frame; | |
703 | ||
704 | skb_err: | |
705 | kfree(frame); | |
706 | frame_err: | |
707 | return NULL; | |
708 | } | |
709 | ||
44331fe2 AS |
710 | static int |
711 | lowpan_process_data(struct sk_buff *skb) | |
712 | { | |
713 | struct ipv6hdr hdr; | |
714 | u8 tmp, iphc0, iphc1, num_context = 0; | |
715 | u8 *_saddr, *_daddr; | |
716 | int err; | |
717 | ||
718 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
719 | skb->len); | |
720 | /* at least two bytes will be used for the encoding */ | |
721 | if (skb->len < 2) | |
722 | goto drop; | |
c5d3687f | 723 | |
724 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
725 | goto drop; | |
719269af | 726 | |
727 | /* fragments assembling */ | |
728 | switch (iphc0 & LOWPAN_DISPATCH_MASK) { | |
729 | case LOWPAN_DISPATCH_FRAG1: | |
730 | case LOWPAN_DISPATCH_FRAGN: | |
731 | { | |
732 | struct lowpan_fragment *frame; | |
5e96855f | 733 | /* slen stores the rightmost 8 bits of the 11 bits length */ |
d991b98f | 734 | u8 slen, offset = 0; |
5e96855f | 735 | u16 len, tag; |
719269af | 736 | bool found = false; |
737 | ||
5e96855f | 738 | if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */ |
c5d3687f | 739 | lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */ |
740 | goto drop; | |
719269af | 741 | |
5e96855f TC |
742 | /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */ |
743 | len = ((iphc0 & 7) << 8) | slen; | |
744 | ||
9da2924c TC |
745 | if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) { |
746 | pr_debug("%s received a FRAG1 packet (tag: %d, " | |
747 | "size of the entire IP packet: %d)", | |
748 | __func__, tag, len); | |
749 | } else { /* FRAGN */ | |
d991b98f TC |
750 | if (lowpan_fetch_skb_u8(skb, &offset)) |
751 | goto unlock_and_drop; | |
9da2924c TC |
752 | pr_debug("%s received a FRAGN packet (tag: %d, " |
753 | "size of the entire IP packet: %d, " | |
754 | "offset: %d)", __func__, tag, len, offset * 8); | |
d991b98f TC |
755 | } |
756 | ||
719269af | 757 | /* |
758 | * check if frame assembling with the same tag is | |
759 | * already in progress | |
760 | */ | |
33c34c5e | 761 | spin_lock_bh(&flist_lock); |
719269af | 762 | |
763 | list_for_each_entry(frame, &lowpan_fragments, list) | |
764 | if (frame->tag == tag) { | |
765 | found = true; | |
766 | break; | |
767 | } | |
768 | ||
769 | /* alloc new frame structure */ | |
770 | if (!found) { | |
9da2924c TC |
771 | pr_debug("%s first fragment received for tag %d, " |
772 | "begin packet reassembly", __func__, tag); | |
5e96855f | 773 | frame = lowpan_alloc_new_frame(skb, len, tag); |
719269af | 774 | if (!frame) |
775 | goto unlock_and_drop; | |
719269af | 776 | } |
777 | ||
719269af | 778 | /* if payload fits buffer, copy it */ |
779 | if (likely((offset * 8 + skb->len) <= frame->length)) | |
780 | skb_copy_to_linear_data_offset(frame->skb, offset * 8, | |
781 | skb->data, skb->len); | |
782 | else | |
783 | goto unlock_and_drop; | |
784 | ||
785 | frame->bytes_rcv += skb->len; | |
786 | ||
787 | /* frame assembling complete */ | |
788 | if ((frame->bytes_rcv == frame->length) && | |
789 | frame->timer.expires > jiffies) { | |
790 | /* if timer haven't expired - first of all delete it */ | |
33c34c5e | 791 | del_timer_sync(&frame->timer); |
719269af | 792 | list_del(&frame->list); |
33c34c5e | 793 | spin_unlock_bh(&flist_lock); |
719269af | 794 | |
9da2924c TC |
795 | pr_debug("%s successfully reassembled fragment " |
796 | "(tag %d)", __func__, tag); | |
797 | ||
719269af | 798 | dev_kfree_skb(skb); |
799 | skb = frame->skb; | |
800 | kfree(frame); | |
c5d3687f | 801 | |
802 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
747cf6ed | 803 | goto drop; |
c5d3687f | 804 | |
719269af | 805 | break; |
806 | } | |
33c34c5e | 807 | spin_unlock_bh(&flist_lock); |
719269af | 808 | |
809 | return kfree_skb(skb), 0; | |
810 | } | |
811 | default: | |
812 | break; | |
813 | } | |
814 | ||
c5d3687f | 815 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
816 | goto drop; | |
44331fe2 AS |
817 | |
818 | _saddr = mac_cb(skb)->sa.hwaddr; | |
819 | _daddr = mac_cb(skb)->da.hwaddr; | |
820 | ||
e71094f9 | 821 | pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1); |
44331fe2 AS |
822 | |
823 | /* another if the CID flag is set */ | |
824 | if (iphc1 & LOWPAN_IPHC_CID) { | |
e71094f9 | 825 | pr_debug("CID flag is set, increase header with one\n"); |
c5d3687f | 826 | if (lowpan_fetch_skb_u8(skb, &num_context)) |
44331fe2 | 827 | goto drop; |
44331fe2 AS |
828 | } |
829 | ||
830 | hdr.version = 6; | |
831 | ||
832 | /* Traffic Class and Flow Label */ | |
833 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
834 | /* | |
835 | * Traffic Class and FLow Label carried in-line | |
836 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
837 | */ | |
838 | case 0: /* 00b */ | |
c5d3687f | 839 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 840 | goto drop; |
c5d3687f | 841 | |
44331fe2 AS |
842 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); |
843 | skb_pull(skb, 3); | |
844 | hdr.priority = ((tmp >> 2) & 0x0f); | |
845 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
846 | (hdr.flow_lbl[0] & 0x0f); | |
847 | break; | |
848 | /* | |
849 | * Traffic class carried in-line | |
850 | * ECN + DSCP (1 byte), Flow Label is elided | |
851 | */ | |
852 | case 1: /* 10b */ | |
c5d3687f | 853 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 854 | goto drop; |
c5d3687f | 855 | |
44331fe2 AS |
856 | hdr.priority = ((tmp >> 2) & 0x0f); |
857 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
858 | hdr.flow_lbl[1] = 0; | |
859 | hdr.flow_lbl[2] = 0; | |
860 | break; | |
861 | /* | |
862 | * Flow Label carried in-line | |
863 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
864 | */ | |
865 | case 2: /* 01b */ | |
c5d3687f | 866 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 867 | goto drop; |
c5d3687f | 868 | |
44331fe2 AS |
869 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); |
870 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
871 | skb_pull(skb, 2); | |
872 | break; | |
873 | /* Traffic Class and Flow Label are elided */ | |
874 | case 3: /* 11b */ | |
875 | hdr.priority = 0; | |
876 | hdr.flow_lbl[0] = 0; | |
877 | hdr.flow_lbl[1] = 0; | |
878 | hdr.flow_lbl[2] = 0; | |
879 | break; | |
880 | default: | |
881 | break; | |
882 | } | |
883 | ||
884 | /* Next Header */ | |
885 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
886 | /* Next header is carried inline */ | |
c5d3687f | 887 | if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr))) |
44331fe2 | 888 | goto drop; |
c5d3687f | 889 | |
e71094f9 | 890 | pr_debug("NH flag is set, next header carried inline: %02x\n", |
891 | hdr.nexthdr); | |
44331fe2 AS |
892 | } |
893 | ||
894 | /* Hop Limit */ | |
895 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
896 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
897 | else { | |
c5d3687f | 898 | if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit))) |
44331fe2 | 899 | goto drop; |
44331fe2 AS |
900 | } |
901 | ||
902 | /* Extract SAM to the tmp variable */ | |
903 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
904 | ||
905 | /* Source address uncompression */ | |
e71094f9 | 906 | pr_debug("source address stateless compression\n"); |
44331fe2 AS |
907 | err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix, |
908 | lowpan_unc_llconf[tmp], skb->data); | |
909 | if (err) | |
910 | goto drop; | |
911 | ||
912 | /* Extract DAM to the tmp variable */ | |
913 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
914 | ||
915 | /* check for Multicast Compression */ | |
916 | if (iphc1 & LOWPAN_IPHC_M) { | |
917 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
e71094f9 | 918 | pr_debug("dest: context-based mcast compression\n"); |
44331fe2 AS |
919 | /* TODO: implement this */ |
920 | } else { | |
921 | u8 prefix[] = {0xff, 0x02}; | |
922 | ||
e71094f9 | 923 | pr_debug("dest: non context-based mcast compression\n"); |
44331fe2 | 924 | if (0 < tmp && tmp < 3) { |
c5d3687f | 925 | if (lowpan_fetch_skb_u8(skb, &prefix[1])) |
44331fe2 | 926 | goto drop; |
44331fe2 AS |
927 | } |
928 | ||
929 | err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix, | |
930 | lowpan_unc_mxconf[tmp], NULL); | |
931 | if (err) | |
932 | goto drop; | |
933 | } | |
934 | } else { | |
e71094f9 | 935 | pr_debug("dest: stateless compression\n"); |
44331fe2 AS |
936 | err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, |
937 | lowpan_unc_llconf[tmp], skb->data); | |
938 | if (err) | |
939 | goto drop; | |
940 | } | |
941 | ||
f8b1b5d2 | 942 | /* UDP data uncompression */ |
f5c20f58 | 943 | if (iphc0 & LOWPAN_IPHC_NH_C) { |
f8b1b5d2 | 944 | if (lowpan_uncompress_udp_header(skb)) |
945 | goto drop; | |
f5c20f58 TC |
946 | hdr.nexthdr = UIP_PROTO_UDP; |
947 | } | |
44331fe2 AS |
948 | |
949 | /* Not fragmented package */ | |
950 | hdr.payload_len = htons(skb->len); | |
951 | ||
e71094f9 | 952 | pr_debug("skb headroom size = %d, data length = %d\n", |
953 | skb_headroom(skb), skb->len); | |
44331fe2 | 954 | |
e71094f9 | 955 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" |
956 | "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version, | |
44331fe2 AS |
957 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); |
958 | ||
959 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
960 | sizeof(hdr)); | |
961 | return lowpan_skb_deliver(skb, &hdr); | |
719269af | 962 | |
963 | unlock_and_drop: | |
33c34c5e | 964 | spin_unlock_bh(&flist_lock); |
44331fe2 | 965 | drop: |
90d0963d | 966 | kfree_skb(skb); |
44331fe2 AS |
967 | return -EINVAL; |
968 | } | |
969 | ||
42c36295 | 970 | static int lowpan_set_address(struct net_device *dev, void *p) |
971 | { | |
972 | struct sockaddr *sa = p; | |
973 | ||
974 | if (netif_running(dev)) | |
975 | return -EBUSY; | |
976 | ||
977 | /* TODO: validate addr */ | |
978 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
719269af | 983 | static int lowpan_get_mac_header_length(struct sk_buff *skb) |
984 | { | |
985 | /* | |
986 | * Currently long addressing mode is supported only, so the overall | |
987 | * header size is 21: | |
988 | * FC SeqNum DPAN DA SA Sec | |
989 | * 2 + 1 + 2 + 8 + 8 + 0 = 21 | |
990 | */ | |
991 | return 21; | |
992 | } | |
993 | ||
994 | static int | |
995 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, | |
d991b98f | 996 | int mlen, int plen, int offset, int type) |
719269af | 997 | { |
998 | struct sk_buff *frag; | |
999 | int hlen, ret; | |
1000 | ||
d991b98f TC |
1001 | hlen = (type == LOWPAN_DISPATCH_FRAG1) ? |
1002 | LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE; | |
719269af | 1003 | |
1004 | lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); | |
1005 | ||
1006 | frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE); | |
1007 | if (!frag) | |
1008 | return -ENOMEM; | |
1009 | ||
1010 | frag->priority = skb->priority; | |
1011 | frag->dev = skb->dev; | |
1012 | ||
1013 | /* copy header, MFR and payload */ | |
1014 | memcpy(skb_put(frag, mlen), skb->data, mlen); | |
1015 | memcpy(skb_put(frag, hlen), head, hlen); | |
1016 | ||
1017 | if (plen) | |
1018 | skb_copy_from_linear_data_offset(skb, offset + mlen, | |
1019 | skb_put(frag, plen), plen); | |
1020 | ||
1021 | lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, | |
1022 | frag->len); | |
1023 | ||
1024 | ret = dev_queue_xmit(frag); | |
1025 | ||
719269af | 1026 | return ret; |
1027 | } | |
1028 | ||
1029 | static int | |
d4ac3236 | 1030 | lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev) |
719269af | 1031 | { |
1032 | int err, header_length, payload_length, tag, offset = 0; | |
1033 | u8 head[5]; | |
1034 | ||
1035 | header_length = lowpan_get_mac_header_length(skb); | |
1036 | payload_length = skb->len - header_length; | |
d4ac3236 | 1037 | tag = lowpan_dev_info(dev)->fragment_tag++; |
719269af | 1038 | |
1039 | /* first fragment header */ | |
5e96855f TC |
1040 | head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7); |
1041 | head[1] = payload_length & 0xff; | |
4576039f TC |
1042 | head[2] = tag >> 8; |
1043 | head[3] = tag & 0xff; | |
719269af | 1044 | |
d991b98f TC |
1045 | err = lowpan_fragment_xmit(skb, head, header_length, LOWPAN_FRAG_SIZE, |
1046 | 0, LOWPAN_DISPATCH_FRAG1); | |
1047 | ||
9da2924c TC |
1048 | if (err) { |
1049 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
1050 | __func__, tag); | |
d991b98f | 1051 | goto exit; |
9da2924c | 1052 | } |
d991b98f TC |
1053 | |
1054 | offset = LOWPAN_FRAG_SIZE; | |
719269af | 1055 | |
1056 | /* next fragment header */ | |
1057 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
1058 | head[0] |= LOWPAN_DISPATCH_FRAGN; | |
1059 | ||
1060 | while ((payload_length - offset > 0) && (err >= 0)) { | |
1061 | int len = LOWPAN_FRAG_SIZE; | |
1062 | ||
1063 | head[4] = offset / 8; | |
1064 | ||
1065 | if (payload_length - offset < len) | |
1066 | len = payload_length - offset; | |
1067 | ||
1068 | err = lowpan_fragment_xmit(skb, head, header_length, | |
d991b98f | 1069 | len, offset, LOWPAN_DISPATCH_FRAGN); |
9da2924c TC |
1070 | if (err) { |
1071 | pr_debug("%s unable to send a subsequent FRAGN packet " | |
1072 | "(tag: %d, offset: %d", __func__, tag, offset); | |
d991b98f | 1073 | goto exit; |
9da2924c | 1074 | } |
d991b98f | 1075 | |
719269af | 1076 | offset += len; |
1077 | } | |
1078 | ||
d991b98f | 1079 | exit: |
719269af | 1080 | return err; |
1081 | } | |
1082 | ||
44331fe2 AS |
1083 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
1084 | { | |
719269af | 1085 | int err = -1; |
44331fe2 | 1086 | |
e71094f9 | 1087 | pr_debug("package xmit\n"); |
44331fe2 AS |
1088 | |
1089 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
1090 | if (skb->dev == NULL) { | |
e71094f9 | 1091 | pr_debug("ERROR: no real wpan device found\n"); |
719269af | 1092 | goto error; |
1093 | } | |
1094 | ||
b333b7e6 AO |
1095 | /* Send directly if less than the MTU minus the 2 checksum bytes. */ |
1096 | if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) { | |
44331fe2 | 1097 | err = dev_queue_xmit(skb); |
719269af | 1098 | goto out; |
1099 | } | |
1100 | ||
e71094f9 | 1101 | pr_debug("frame is too big, fragmentation is needed\n"); |
d4ac3236 | 1102 | err = lowpan_skb_fragmentation(skb, dev); |
719269af | 1103 | error: |
1104 | dev_kfree_skb(skb); | |
1105 | out: | |
1106 | if (err < 0) | |
e71094f9 | 1107 | pr_debug("ERROR: xmit failed\n"); |
44331fe2 AS |
1108 | |
1109 | return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK); | |
1110 | } | |
1111 | ||
0848e404 | 1112 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
1113 | { | |
1114 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1115 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); | |
1116 | } | |
1117 | ||
1118 | static u16 lowpan_get_pan_id(const struct net_device *dev) | |
1119 | { | |
1120 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1121 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); | |
1122 | } | |
1123 | ||
1124 | static u16 lowpan_get_short_addr(const struct net_device *dev) | |
1125 | { | |
1126 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1127 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); | |
1128 | } | |
1129 | ||
44331fe2 AS |
1130 | static struct header_ops lowpan_header_ops = { |
1131 | .create = lowpan_header_create, | |
1132 | }; | |
1133 | ||
1134 | static const struct net_device_ops lowpan_netdev_ops = { | |
1135 | .ndo_start_xmit = lowpan_xmit, | |
42c36295 | 1136 | .ndo_set_mac_address = lowpan_set_address, |
44331fe2 AS |
1137 | }; |
1138 | ||
0848e404 | 1139 | static struct ieee802154_mlme_ops lowpan_mlme = { |
1140 | .get_pan_id = lowpan_get_pan_id, | |
1141 | .get_phy = lowpan_get_phy, | |
1142 | .get_short_addr = lowpan_get_short_addr, | |
1143 | }; | |
1144 | ||
44331fe2 AS |
1145 | static void lowpan_setup(struct net_device *dev) |
1146 | { | |
44331fe2 AS |
1147 | dev->addr_len = IEEE802154_ADDR_LEN; |
1148 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
1149 | dev->type = ARPHRD_IEEE802154; | |
44331fe2 AS |
1150 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
1151 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
1152 | dev->needed_tailroom = 2; /* FCS */ | |
1153 | dev->mtu = 1281; | |
1154 | dev->tx_queue_len = 0; | |
4d039f68 | 1155 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
44331fe2 AS |
1156 | dev->watchdog_timeo = 0; |
1157 | ||
1158 | dev->netdev_ops = &lowpan_netdev_ops; | |
1159 | dev->header_ops = &lowpan_header_ops; | |
0848e404 | 1160 | dev->ml_priv = &lowpan_mlme; |
a2dc375e | 1161 | dev->destructor = free_netdev; |
44331fe2 AS |
1162 | } |
1163 | ||
1164 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1165 | { | |
44331fe2 AS |
1166 | if (tb[IFLA_ADDRESS]) { |
1167 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
1168 | return -EINVAL; | |
1169 | } | |
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
1174 | struct packet_type *pt, struct net_device *orig_dev) | |
1175 | { | |
a437d274 AO |
1176 | struct sk_buff *local_skb; |
1177 | ||
44331fe2 AS |
1178 | if (!netif_running(dev)) |
1179 | goto drop; | |
1180 | ||
1181 | if (dev->type != ARPHRD_IEEE802154) | |
1182 | goto drop; | |
1183 | ||
1184 | /* check that it's our buffer */ | |
ee21c7e0 AO |
1185 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { |
1186 | /* Copy the packet so that the IPv6 header is | |
1187 | * properly aligned. | |
1188 | */ | |
1189 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
1190 | skb_tailroom(skb), GFP_ATOMIC); | |
a437d274 AO |
1191 | if (!local_skb) |
1192 | goto drop; | |
a437d274 | 1193 | |
ee21c7e0 AO |
1194 | local_skb->protocol = htons(ETH_P_IPV6); |
1195 | local_skb->pkt_type = PACKET_HOST; | |
1196 | ||
1197 | /* Pull off the 1-byte of 6lowpan header. */ | |
1198 | skb_pull(local_skb, 1); | |
1199 | skb_reset_network_header(local_skb); | |
1200 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); | |
1201 | ||
1202 | lowpan_give_skb_to_devices(local_skb); | |
1203 | ||
1204 | kfree_skb(local_skb); | |
a437d274 | 1205 | kfree_skb(skb); |
ee21c7e0 AO |
1206 | } else { |
1207 | switch (skb->data[0] & 0xe0) { | |
1208 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
1209 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ | |
1210 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ | |
1211 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
1212 | if (!local_skb) | |
1213 | goto drop; | |
1214 | lowpan_process_data(local_skb); | |
1215 | ||
1216 | kfree_skb(skb); | |
1217 | break; | |
1218 | default: | |
1219 | break; | |
1220 | } | |
719269af | 1221 | } |
44331fe2 AS |
1222 | |
1223 | return NET_RX_SUCCESS; | |
1224 | ||
1225 | drop: | |
1226 | kfree_skb(skb); | |
1227 | return NET_RX_DROP; | |
1228 | } | |
1229 | ||
1230 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
1231 | struct nlattr *tb[], struct nlattr *data[]) | |
1232 | { | |
1233 | struct net_device *real_dev; | |
1234 | struct lowpan_dev_record *entry; | |
1235 | ||
e71094f9 | 1236 | pr_debug("adding new link\n"); |
44331fe2 AS |
1237 | |
1238 | if (!tb[IFLA_LINK]) | |
1239 | return -EINVAL; | |
1240 | /* find and hold real wpan device */ | |
1241 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
1242 | if (!real_dev) | |
1243 | return -ENODEV; | |
1244 | ||
1245 | lowpan_dev_info(dev)->real_dev = real_dev; | |
d4ac3236 | 1246 | lowpan_dev_info(dev)->fragment_tag = 0; |
44331fe2 AS |
1247 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); |
1248 | ||
1249 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); | |
dc00fd44 DC |
1250 | if (!entry) { |
1251 | dev_put(real_dev); | |
1252 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 1253 | return -ENOMEM; |
dc00fd44 | 1254 | } |
44331fe2 AS |
1255 | |
1256 | entry->ldev = dev; | |
1257 | ||
1258 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1259 | INIT_LIST_HEAD(&entry->list); | |
1260 | list_add_tail(&entry->list, &lowpan_devices); | |
1261 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1262 | ||
1263 | register_netdevice(dev); | |
1264 | ||
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
1269 | { | |
1270 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
1271 | struct net_device *real_dev = lowpan_dev->real_dev; | |
8deff4af | 1272 | struct lowpan_dev_record *entry, *tmp; |
44331fe2 AS |
1273 | |
1274 | ASSERT_RTNL(); | |
1275 | ||
1276 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
aec9db35 | 1277 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
1278 | if (entry->ldev == dev) { |
1279 | list_del(&entry->list); | |
1280 | kfree(entry); | |
1281 | } | |
aec9db35 | 1282 | } |
44331fe2 AS |
1283 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
1284 | ||
1285 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
1286 | ||
1287 | unregister_netdevice_queue(dev, head); | |
1288 | ||
1289 | dev_put(real_dev); | |
1290 | } | |
1291 | ||
1292 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
1293 | .kind = "lowpan", | |
1294 | .priv_size = sizeof(struct lowpan_dev_info), | |
1295 | .setup = lowpan_setup, | |
1296 | .newlink = lowpan_newlink, | |
1297 | .dellink = lowpan_dellink, | |
1298 | .validate = lowpan_validate, | |
1299 | }; | |
1300 | ||
1301 | static inline int __init lowpan_netlink_init(void) | |
1302 | { | |
1303 | return rtnl_link_register(&lowpan_link_ops); | |
1304 | } | |
1305 | ||
a07fdcec | 1306 | static inline void lowpan_netlink_fini(void) |
44331fe2 AS |
1307 | { |
1308 | rtnl_link_unregister(&lowpan_link_ops); | |
1309 | } | |
1310 | ||
a2dc375e AO |
1311 | static int lowpan_device_event(struct notifier_block *unused, |
1312 | unsigned long event, | |
1313 | void *ptr) | |
1314 | { | |
1315 | struct net_device *dev = ptr; | |
1316 | LIST_HEAD(del_list); | |
1317 | struct lowpan_dev_record *entry, *tmp; | |
1318 | ||
1319 | if (dev->type != ARPHRD_IEEE802154) | |
1320 | goto out; | |
1321 | ||
1322 | if (event == NETDEV_UNREGISTER) { | |
1323 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { | |
1324 | if (lowpan_dev_info(entry->ldev)->real_dev == dev) | |
1325 | lowpan_dellink(entry->ldev, &del_list); | |
1326 | } | |
1327 | ||
1328 | unregister_netdevice_many(&del_list); | |
4c835019 | 1329 | } |
a2dc375e AO |
1330 | |
1331 | out: | |
1332 | return NOTIFY_DONE; | |
1333 | } | |
1334 | ||
1335 | static struct notifier_block lowpan_dev_notifier = { | |
1336 | .notifier_call = lowpan_device_event, | |
1337 | }; | |
1338 | ||
44331fe2 AS |
1339 | static struct packet_type lowpan_packet_type = { |
1340 | .type = __constant_htons(ETH_P_IEEE802154), | |
1341 | .func = lowpan_rcv, | |
1342 | }; | |
1343 | ||
1344 | static int __init lowpan_init_module(void) | |
1345 | { | |
1346 | int err = 0; | |
1347 | ||
44331fe2 AS |
1348 | err = lowpan_netlink_init(); |
1349 | if (err < 0) | |
1350 | goto out; | |
1351 | ||
1352 | dev_add_pack(&lowpan_packet_type); | |
a2dc375e AO |
1353 | |
1354 | err = register_netdevice_notifier(&lowpan_dev_notifier); | |
1355 | if (err < 0) { | |
1356 | dev_remove_pack(&lowpan_packet_type); | |
1357 | lowpan_netlink_fini(); | |
1358 | } | |
44331fe2 AS |
1359 | out: |
1360 | return err; | |
1361 | } | |
1362 | ||
1363 | static void __exit lowpan_cleanup_module(void) | |
1364 | { | |
33c34c5e | 1365 | struct lowpan_fragment *frame, *tframe; |
1366 | ||
44331fe2 AS |
1367 | lowpan_netlink_fini(); |
1368 | ||
1369 | dev_remove_pack(&lowpan_packet_type); | |
33c34c5e | 1370 | |
a2dc375e AO |
1371 | unregister_netdevice_notifier(&lowpan_dev_notifier); |
1372 | ||
33c34c5e | 1373 | /* Now 6lowpan packet_type is removed, so no new fragments are |
1374 | * expected on RX, therefore that's the time to clean incomplete | |
1375 | * fragments. | |
1376 | */ | |
1377 | spin_lock_bh(&flist_lock); | |
1378 | list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) { | |
1379 | del_timer_sync(&frame->timer); | |
1380 | list_del(&frame->list); | |
1381 | dev_kfree_skb(frame->skb); | |
1382 | kfree(frame); | |
1383 | } | |
1384 | spin_unlock_bh(&flist_lock); | |
44331fe2 AS |
1385 | } |
1386 | ||
1387 | module_init(lowpan_init_module); | |
1388 | module_exit(lowpan_cleanup_module); | |
1389 | MODULE_LICENSE("GPL"); | |
1390 | MODULE_ALIAS_RTNL_LINK("lowpan"); |