blob: cd5007f3a5695cf5290827fa777dbd9d6704efc6 [file] [log] [blame]
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001/*
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
Alexander Smirnov44331fe2011-08-24 19:34:42 -070053#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>
Danny Kukawkacdf49c22012-02-22 02:36:39 +000058#include <linux/etherdevice.h>
Alexander Smirnov44331fe2011-08-24 19:34:42 -070059#include <net/af_ieee802154.h>
60#include <net/ieee802154.h>
61#include <net/ieee802154_netdev.h>
62#include <net/ipv6.h>
63
64#include "6lowpan.h"
65
66/* TTL uncompression values */
67static const u8 lowpan_ttl_values[] = {0, 1, 64, 255};
68
69static LIST_HEAD(lowpan_devices);
70
71/*
72 * Uncompression of linklocal:
73 * 0 -> 16 bytes from packet
74 * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet
75 * 2 -> 2 bytes from prefix - zeroes + 2 from packet
76 * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr
77 *
78 * NOTE: => the uncompress function does change 0xf to 0x10
79 * NOTE: 0x00 => no-autoconfig => unspecified
80 */
81static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20};
82
83/*
84 * Uncompression of ctx-based:
85 * 0 -> 0 bits from packet [unspecified / reserved]
86 * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet
87 * 2 -> 8 bytes from prefix - zeroes + 2 from packet
88 * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr
89 */
90static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80};
91
92/*
93 * Uncompression of ctx-base
94 * 0 -> 0 bits from packet
95 * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet
96 * 2 -> 2 bytes from prefix - zeroes + 3 from packet
97 * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr
98 */
99static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
100
101/* Link local prefix */
102static const u8 lowpan_llprefix[] = {0xfe, 0x80};
103
104/* private device info */
105struct lowpan_dev_info {
106 struct net_device *real_dev; /* real WPAN device ptr */
107 struct mutex dev_list_mtx; /* mutex for list ops */
108};
109
110struct lowpan_dev_record {
111 struct net_device *ldev;
112 struct list_head list;
113};
114
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000115struct lowpan_fragment {
116 struct sk_buff *skb; /* skb to be assembled */
117 spinlock_t lock; /* concurency lock */
118 u16 length; /* length to be assemled */
119 u32 bytes_rcv; /* bytes received */
120 u16 tag; /* current fragment tag */
121 struct timer_list timer; /* assembling timer */
122 struct list_head list; /* fragments list */
123};
124
125static unsigned short fragment_tag;
126static LIST_HEAD(lowpan_fragments);
127spinlock_t flist_lock;
128
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700129static inline struct
130lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
131{
132 return netdev_priv(dev);
133}
134
135static inline void lowpan_address_flip(u8 *src, u8 *dest)
136{
137 int i;
138 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
139 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
140}
141
142/* list of all 6lowpan devices, uses for package delivering */
143/* print data in line */
144static inline void lowpan_raw_dump_inline(const char *caller, char *msg,
145 unsigned char *buf, int len)
146{
147#ifdef DEBUG
148 if (msg)
149 pr_debug("(%s) %s: ", caller, msg);
150 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE,
151 16, 1, buf, len, false);
152#endif /* DEBUG */
153}
154
155/*
156 * print data in a table format:
157 *
158 * addr: xx xx xx xx xx xx
159 * addr: xx xx xx xx xx xx
160 * ...
161 */
162static inline void lowpan_raw_dump_table(const char *caller, char *msg,
163 unsigned char *buf, int len)
164{
165#ifdef DEBUG
166 if (msg)
167 pr_debug("(%s) %s:\n", caller, msg);
168 print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET,
169 16, 1, buf, len, false);
170#endif /* DEBUG */
171}
172
173static u8
174lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
175 const unsigned char *lladdr)
176{
177 u8 val = 0;
178
179 if (is_addr_mac_addr_based(ipaddr, lladdr))
180 val = 3; /* 0-bits */
181 else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
182 /* compress IID to 16 bits xxxx::XXXX */
183 memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
184 *hc06_ptr += 2;
185 val = 2; /* 16-bits */
186 } else {
187 /* do not compress IID => xxxx::IID */
188 memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
189 *hc06_ptr += 8;
190 val = 1; /* 64-bits */
191 }
192
193 return rol8(val, shift);
194}
195
196static void
197lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr)
198{
alex.bluesman.smirnov@gmail.com2d319502012-04-25 23:35:51 +0000199 memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700200 /* second bit-flip (Universe/Local) is done according RFC2464 */
201 ipaddr->s6_addr[8] ^= 0x02;
202}
203
204/*
205 * Uncompress addresses based on a prefix and a postfix with zeroes in
206 * between. If the postfix is zero in length it will use the link address
207 * to configure the IP address (autoconf style).
208 * pref_post_count takes a byte where the first nibble specify prefix count
209 * and the second postfix count (NOTE: 15/0xf => 16 bytes copy).
210 */
211static int
212lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr,
213 u8 const *prefix, u8 pref_post_count, unsigned char *lladdr)
214{
215 u8 prefcount = pref_post_count >> 4;
216 u8 postcount = pref_post_count & 0x0f;
217
218 /* full nibble 15 => 16 */
219 prefcount = (prefcount == 15 ? 16 : prefcount);
220 postcount = (postcount == 15 ? 16 : postcount);
221
222 if (lladdr)
223 lowpan_raw_dump_inline(__func__, "linklocal address",
alex.bluesman.smirnov@gmail.com2d319502012-04-25 23:35:51 +0000224 lladdr, IEEE802154_ADDR_LEN);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700225 if (prefcount > 0)
226 memcpy(ipaddr, prefix, prefcount);
227
228 if (prefcount + postcount < 16)
229 memset(&ipaddr->s6_addr[prefcount], 0,
230 16 - (prefcount + postcount));
231
232 if (postcount > 0) {
233 memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount);
234 skb_pull(skb, postcount);
235 } else if (prefcount > 0) {
236 if (lladdr == NULL)
237 return -EINVAL;
238
239 /* no IID based configuration if no prefix and no data */
240 lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr);
241 }
242
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000243 pr_debug("uncompressing %d + %d => ", prefcount, postcount);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700244 lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
245
246 return 0;
247}
248
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000249static void
250lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
251{
252 struct udphdr *uh = udp_hdr(skb);
253
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000254 if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
255 LOWPAN_NHC_UDP_4BIT_PORT) &&
256 ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
257 LOWPAN_NHC_UDP_4BIT_PORT)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000258 pr_debug("UDP header: both ports compression to 4 bits\n");
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000259 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
260 **(hc06_ptr + 1) = /* subtraction is faster */
261 (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
262 ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
263 *hc06_ptr += 2;
264 } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
265 LOWPAN_NHC_UDP_8BIT_PORT) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000266 pr_debug("UDP header: remove 8 bits of dest\n");
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000267 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
268 memcpy(*hc06_ptr + 1, &uh->source, 2);
269 **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
270 *hc06_ptr += 4;
271 } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
272 LOWPAN_NHC_UDP_8BIT_PORT) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000273 pr_debug("UDP header: remove 8 bits of source\n");
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000274 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
275 memcpy(*hc06_ptr + 1, &uh->dest, 2);
276 **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
277 *hc06_ptr += 4;
278 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000279 pr_debug("UDP header: can't compress\n");
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000280 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
281 memcpy(*hc06_ptr + 1, &uh->source, 2);
282 memcpy(*hc06_ptr + 3, &uh->dest, 2);
283 *hc06_ptr += 5;
284 }
285
286 /* checksum is always inline */
287 memcpy(*hc06_ptr, &uh->check, 2);
288 *hc06_ptr += 2;
289}
290
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000291static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700292{
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000293 if (unlikely(!pskb_may_pull(skb, 1)))
294 return -EINVAL;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700295
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000296 *val = skb->data[0];
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700297 skb_pull(skb, 1);
298
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000299 return 0;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700300}
301
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000302static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000303{
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000304 if (unlikely(!pskb_may_pull(skb, 2)))
305 return -EINVAL;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000306
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000307 *val = skb->data[0] | (skb->data[1] << 8);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000308 skb_pull(skb, 2);
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000309
310 return 0;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000311}
312
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000313static int
314lowpan_uncompress_udp_header(struct sk_buff *skb)
315{
316 struct udphdr *uh = udp_hdr(skb);
317 u8 tmp;
318
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000319 if (lowpan_fetch_skb_u8(skb, &tmp))
320 goto err;
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000321
322 if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000323 pr_debug("UDP header uncompression\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000324 switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
325 case LOWPAN_NHC_UDP_CS_P_00:
326 memcpy(&uh->source, &skb->data[0], 2);
327 memcpy(&uh->dest, &skb->data[2], 2);
328 skb_pull(skb, 4);
329 break;
330 case LOWPAN_NHC_UDP_CS_P_01:
331 memcpy(&uh->source, &skb->data[0], 2);
332 uh->dest =
333 skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
334 skb_pull(skb, 3);
335 break;
336 case LOWPAN_NHC_UDP_CS_P_10:
337 uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
338 memcpy(&uh->dest, &skb->data[1], 2);
339 skb_pull(skb, 3);
340 break;
341 case LOWPAN_NHC_UDP_CS_P_11:
342 uh->source =
343 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
344 uh->dest =
345 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
346 skb_pull(skb, 1);
347 break;
348 default:
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000349 pr_debug("ERROR: unknown UDP format\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000350 goto err;
351 break;
352 }
353
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000354 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
355 uh->source, uh->dest);
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000356
357 /* copy checksum */
358 memcpy(&uh->check, &skb->data[0], 2);
359 skb_pull(skb, 2);
360 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000361 pr_debug("ERROR: unsupported NH format\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000362 goto err;
363 }
364
365 return 0;
366err:
367 return -EINVAL;
368}
369
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700370static int lowpan_header_create(struct sk_buff *skb,
371 struct net_device *dev,
372 unsigned short type, const void *_daddr,
Eric Dumazet95c96172012-04-15 05:58:06 +0000373 const void *_saddr, unsigned int len)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700374{
375 u8 tmp, iphc0, iphc1, *hc06_ptr;
376 struct ipv6hdr *hdr;
377 const u8 *saddr = _saddr;
378 const u8 *daddr = _daddr;
379 u8 *head;
380 struct ieee802154_addr sa, da;
381
382 if (type != ETH_P_IPV6)
383 return 0;
384 /* TODO:
385 * if this package isn't ipv6 one, where should it be routed?
386 */
387 head = kzalloc(100, GFP_KERNEL);
388 if (head == NULL)
389 return -ENOMEM;
390
391 hdr = ipv6_hdr(skb);
392 hc06_ptr = head + 2;
393
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000394 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
395 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
396 ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700397
398 lowpan_raw_dump_table(__func__, "raw skb network header dump",
399 skb_network_header(skb), sizeof(struct ipv6hdr));
400
401 if (!saddr)
402 saddr = dev->dev_addr;
403
404 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
405
406 /*
407 * As we copy some bit-length fields, in the IPHC encoding bytes,
408 * we sometimes use |=
409 * If the field is 0, and the current bit value in memory is 1,
410 * this does not work. We therefore reset the IPHC encoding here
411 */
412 iphc0 = LOWPAN_DISPATCH_IPHC;
413 iphc1 = 0;
414
415 /* TODO: context lookup */
416
417 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
418
419 /*
420 * Traffic class, flow label
421 * If flow label is 0, compress it. If traffic class is 0, compress it
422 * We have to process both in the same time as the offset of traffic
423 * class depends on the presence of version and flow label
424 */
425
426 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
427 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
428 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
429
430 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
431 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
432 /* flow label can be compressed */
433 iphc0 |= LOWPAN_IPHC_FL_C;
434 if ((hdr->priority == 0) &&
435 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
436 /* compress (elide) all */
437 iphc0 |= LOWPAN_IPHC_TC_C;
438 } else {
439 /* compress only the flow label */
440 *hc06_ptr = tmp;
441 hc06_ptr += 1;
442 }
443 } else {
444 /* Flow label cannot be compressed */
445 if ((hdr->priority == 0) &&
446 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
447 /* compress only traffic class */
448 iphc0 |= LOWPAN_IPHC_TC_C;
449 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
450 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
451 hc06_ptr += 3;
452 } else {
453 /* compress nothing */
454 memcpy(hc06_ptr, &hdr, 4);
455 /* replace the top byte with new ECN | DSCP format */
456 *hc06_ptr = tmp;
457 hc06_ptr += 4;
458 }
459 }
460
461 /* NOTE: payload length is always compressed */
462
463 /* Next Header is compress if UDP */
464 if (hdr->nexthdr == UIP_PROTO_UDP)
465 iphc0 |= LOWPAN_IPHC_NH_C;
466
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700467 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
468 *hc06_ptr = hdr->nexthdr;
469 hc06_ptr += 1;
470 }
471
472 /*
473 * Hop limit
474 * if 1: compress, encoding is 01
475 * if 64: compress, encoding is 10
476 * if 255: compress, encoding is 11
477 * else do not compress
478 */
479 switch (hdr->hop_limit) {
480 case 1:
481 iphc0 |= LOWPAN_IPHC_TTL_1;
482 break;
483 case 64:
484 iphc0 |= LOWPAN_IPHC_TTL_64;
485 break;
486 case 255:
487 iphc0 |= LOWPAN_IPHC_TTL_255;
488 break;
489 default:
490 *hc06_ptr = hdr->hop_limit;
alex.bluesman.smirnov@gmail.com5c00c0c2012-06-25 03:49:02 +0000491 hc06_ptr += 1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700492 break;
493 }
494
495 /* source address compression */
496 if (is_addr_unspecified(&hdr->saddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000497 pr_debug("source address is unspecified, setting SAC\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700498 iphc1 |= LOWPAN_IPHC_SAC;
499 /* TODO: context lookup */
500 } else if (is_addr_link_local(&hdr->saddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000501 pr_debug("source address is link-local\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700502 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
503 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
504 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000505 pr_debug("send the full source address\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700506 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
507 hc06_ptr += 16;
508 }
509
510 /* destination address compression */
511 if (is_addr_mcast(&hdr->daddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000512 pr_debug("destination address is multicast: ");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700513 iphc1 |= LOWPAN_IPHC_M;
514 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
515 pr_debug("compressed to 1 octet\n");
516 iphc1 |= LOWPAN_IPHC_DAM_11;
517 /* use last byte */
518 *hc06_ptr = hdr->daddr.s6_addr[15];
519 hc06_ptr += 1;
520 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
521 pr_debug("compressed to 4 octets\n");
522 iphc1 |= LOWPAN_IPHC_DAM_10;
523 /* second byte + the last three */
524 *hc06_ptr = hdr->daddr.s6_addr[1];
525 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
526 hc06_ptr += 4;
527 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
528 pr_debug("compressed to 6 octets\n");
529 iphc1 |= LOWPAN_IPHC_DAM_01;
530 /* second byte + the last five */
531 *hc06_ptr = hdr->daddr.s6_addr[1];
532 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
533 hc06_ptr += 6;
534 } else {
535 pr_debug("using full address\n");
536 iphc1 |= LOWPAN_IPHC_DAM_00;
537 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
538 hc06_ptr += 16;
539 }
540 } else {
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700541 /* TODO: context lookup */
542 if (is_addr_link_local(&hdr->daddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000543 pr_debug("dest address is unicast and link-local\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700544 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
545 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
546 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000547 pr_debug("dest address is unicast: using full one\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700548 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
549 hc06_ptr += 16;
550 }
551 }
552
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000553 /* UDP header compression */
554 if (hdr->nexthdr == UIP_PROTO_UDP)
555 lowpan_compress_udp_header(&hc06_ptr, skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700556
557 head[0] = iphc0;
558 head[1] = iphc1;
559
560 skb_pull(skb, sizeof(struct ipv6hdr));
561 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
562
563 kfree(head);
564
565 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
566 skb->len);
567
568 /*
569 * NOTE1: I'm still unsure about the fact that compression and WPAN
570 * header are created here and not later in the xmit. So wait for
571 * an opinion of net maintainers.
572 */
573 /*
574 * NOTE2: to be absolutely correct, we must derive PANid information
575 * from MAC subif of the 'dev' and 'real_dev' network devices, but
576 * this isn't implemented in mainline yet, so currently we assign 0xff
577 */
578 {
579 /* prepare wpan address data */
580 sa.addr_type = IEEE802154_ADDR_LONG;
581 sa.pan_id = 0xff;
582
583 da.addr_type = IEEE802154_ADDR_LONG;
584 da.pan_id = 0xff;
585
586 memcpy(&(da.hwaddr), daddr, 8);
587 memcpy(&(sa.hwaddr), saddr, 8);
588
589 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000590
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700591 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
592 type, (void *)&da, (void *)&sa, skb->len);
593 }
594}
595
596static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
597{
598 struct sk_buff *new;
599 struct lowpan_dev_record *entry;
600 int stat = NET_RX_SUCCESS;
601
602 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000603 GFP_ATOMIC);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700604 kfree_skb(skb);
605
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000606 if (!new)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700607 return -ENOMEM;
608
609 skb_push(new, sizeof(struct ipv6hdr));
610 skb_reset_network_header(new);
611 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
612
613 new->protocol = htons(ETH_P_IPV6);
614 new->pkt_type = PACKET_HOST;
615
616 rcu_read_lock();
617 list_for_each_entry_rcu(entry, &lowpan_devices, list)
618 if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000619 skb = skb_copy(new, GFP_ATOMIC);
620 if (!skb) {
621 stat = -ENOMEM;
622 break;
623 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700624
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000625 skb->dev = entry->ldev;
626 stat = netif_rx(skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700627 }
628 rcu_read_unlock();
629
630 kfree_skb(new);
631
632 return stat;
633}
634
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000635static void lowpan_fragment_timer_expired(unsigned long entry_addr)
636{
637 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
638
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000639 pr_debug("timer expired for frame with tag %d\n", entry->tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000640
641 spin_lock(&flist_lock);
642 list_del(&entry->list);
643 spin_unlock(&flist_lock);
644
645 dev_kfree_skb(entry->skb);
646 kfree(entry);
647}
648
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000649static struct lowpan_fragment *
650lowpan_alloc_new_frame(struct sk_buff *skb, u8 iphc0, u8 len, u8 tag)
651{
652 struct lowpan_fragment *frame;
653
654 frame = kzalloc(sizeof(struct lowpan_fragment),
655 GFP_ATOMIC);
656 if (!frame)
657 goto frame_err;
658
659 INIT_LIST_HEAD(&frame->list);
660
661 frame->length = (iphc0 & 7) | (len << 3);
662 frame->tag = tag;
663
664 /* allocate buffer for frame assembling */
665 frame->skb = alloc_skb(frame->length +
666 sizeof(struct ipv6hdr), GFP_ATOMIC);
667
668 if (!frame->skb)
669 goto skb_err;
670
671 frame->skb->priority = skb->priority;
672 frame->skb->dev = skb->dev;
673
674 /* reserve headroom for uncompressed ipv6 header */
675 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
676 skb_put(frame->skb, frame->length);
677
678 init_timer(&frame->timer);
679 /* time out is the same as for ipv6 - 60 sec */
680 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
681 frame->timer.data = (unsigned long)frame;
682 frame->timer.function = lowpan_fragment_timer_expired;
683
684 add_timer(&frame->timer);
685
686 list_add_tail(&frame->list, &lowpan_fragments);
687
688 return frame;
689
690skb_err:
691 kfree(frame);
692frame_err:
693 return NULL;
694}
695
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700696static int
697lowpan_process_data(struct sk_buff *skb)
698{
699 struct ipv6hdr hdr;
700 u8 tmp, iphc0, iphc1, num_context = 0;
701 u8 *_saddr, *_daddr;
702 int err;
703
704 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
705 skb->len);
706 /* at least two bytes will be used for the encoding */
707 if (skb->len < 2)
708 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000709
710 if (lowpan_fetch_skb_u8(skb, &iphc0))
711 goto drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000712
713 /* fragments assembling */
714 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
715 case LOWPAN_DISPATCH_FRAG1:
716 case LOWPAN_DISPATCH_FRAGN:
717 {
718 struct lowpan_fragment *frame;
719 u8 len, offset;
720 u16 tag;
721 bool found = false;
722
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000723 if (lowpan_fetch_skb_u8(skb, &len) || /* frame length */
724 lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
725 goto drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000726
727 /*
728 * check if frame assembling with the same tag is
729 * already in progress
730 */
731 spin_lock(&flist_lock);
732
733 list_for_each_entry(frame, &lowpan_fragments, list)
734 if (frame->tag == tag) {
735 found = true;
736 break;
737 }
738
739 /* alloc new frame structure */
740 if (!found) {
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000741 frame = lowpan_alloc_new_frame(skb, iphc0, len, tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000742 if (!frame)
743 goto unlock_and_drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000744 }
745
746 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
747 goto unlock_and_drop;
748
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000749 if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */
750 goto unlock_and_drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000751
752 /* if payload fits buffer, copy it */
753 if (likely((offset * 8 + skb->len) <= frame->length))
754 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
755 skb->data, skb->len);
756 else
757 goto unlock_and_drop;
758
759 frame->bytes_rcv += skb->len;
760
761 /* frame assembling complete */
762 if ((frame->bytes_rcv == frame->length) &&
763 frame->timer.expires > jiffies) {
764 /* if timer haven't expired - first of all delete it */
765 del_timer(&frame->timer);
766 list_del(&frame->list);
767 spin_unlock(&flist_lock);
768
769 dev_kfree_skb(skb);
770 skb = frame->skb;
771 kfree(frame);
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000772
773 if (lowpan_fetch_skb_u8(skb, &iphc0))
Dan Carpenter747cf6e2012-06-26 20:53:09 +0000774 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000775
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000776 break;
777 }
778 spin_unlock(&flist_lock);
779
780 return kfree_skb(skb), 0;
781 }
782 default:
783 break;
784 }
785
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000786 if (lowpan_fetch_skb_u8(skb, &iphc1))
787 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700788
789 _saddr = mac_cb(skb)->sa.hwaddr;
790 _daddr = mac_cb(skb)->da.hwaddr;
791
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000792 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700793
794 /* another if the CID flag is set */
795 if (iphc1 & LOWPAN_IPHC_CID) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000796 pr_debug("CID flag is set, increase header with one\n");
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000797 if (lowpan_fetch_skb_u8(skb, &num_context))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700798 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700799 }
800
801 hdr.version = 6;
802
803 /* Traffic Class and Flow Label */
804 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
805 /*
806 * Traffic Class and FLow Label carried in-line
807 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
808 */
809 case 0: /* 00b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000810 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700811 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000812
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700813 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
814 skb_pull(skb, 3);
815 hdr.priority = ((tmp >> 2) & 0x0f);
816 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
817 (hdr.flow_lbl[0] & 0x0f);
818 break;
819 /*
820 * Traffic class carried in-line
821 * ECN + DSCP (1 byte), Flow Label is elided
822 */
823 case 1: /* 10b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000824 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700825 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000826
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700827 hdr.priority = ((tmp >> 2) & 0x0f);
828 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
829 hdr.flow_lbl[1] = 0;
830 hdr.flow_lbl[2] = 0;
831 break;
832 /*
833 * Flow Label carried in-line
834 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
835 */
836 case 2: /* 01b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000837 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700838 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000839
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700840 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
841 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
842 skb_pull(skb, 2);
843 break;
844 /* Traffic Class and Flow Label are elided */
845 case 3: /* 11b */
846 hdr.priority = 0;
847 hdr.flow_lbl[0] = 0;
848 hdr.flow_lbl[1] = 0;
849 hdr.flow_lbl[2] = 0;
850 break;
851 default:
852 break;
853 }
854
855 /* Next Header */
856 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
857 /* Next header is carried inline */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000858 if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700859 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000860
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000861 pr_debug("NH flag is set, next header carried inline: %02x\n",
862 hdr.nexthdr);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700863 }
864
865 /* Hop Limit */
866 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
867 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
868 else {
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000869 if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700870 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700871 }
872
873 /* Extract SAM to the tmp variable */
874 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
875
876 /* Source address uncompression */
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000877 pr_debug("source address stateless compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700878 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
879 lowpan_unc_llconf[tmp], skb->data);
880 if (err)
881 goto drop;
882
883 /* Extract DAM to the tmp variable */
884 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
885
886 /* check for Multicast Compression */
887 if (iphc1 & LOWPAN_IPHC_M) {
888 if (iphc1 & LOWPAN_IPHC_DAC) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000889 pr_debug("dest: context-based mcast compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700890 /* TODO: implement this */
891 } else {
892 u8 prefix[] = {0xff, 0x02};
893
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000894 pr_debug("dest: non context-based mcast compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700895 if (0 < tmp && tmp < 3) {
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000896 if (lowpan_fetch_skb_u8(skb, &prefix[1]))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700897 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700898 }
899
900 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
901 lowpan_unc_mxconf[tmp], NULL);
902 if (err)
903 goto drop;
904 }
905 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000906 pr_debug("dest: stateless compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700907 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
908 lowpan_unc_llconf[tmp], skb->data);
909 if (err)
910 goto drop;
911 }
912
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000913 /* UDP data uncompression */
914 if (iphc0 & LOWPAN_IPHC_NH_C)
915 if (lowpan_uncompress_udp_header(skb))
916 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700917
918 /* Not fragmented package */
919 hdr.payload_len = htons(skb->len);
920
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000921 pr_debug("skb headroom size = %d, data length = %d\n",
922 skb_headroom(skb), skb->len);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700923
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000924 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
925 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700926 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
927
928 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
929 sizeof(hdr));
930 return lowpan_skb_deliver(skb, &hdr);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000931
932unlock_and_drop:
933 spin_unlock(&flist_lock);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700934drop:
Dan Carpenter90d09632011-08-30 03:45:52 +0000935 kfree_skb(skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700936 return -EINVAL;
937}
938
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000939static int lowpan_get_mac_header_length(struct sk_buff *skb)
940{
941 /*
942 * Currently long addressing mode is supported only, so the overall
943 * header size is 21:
944 * FC SeqNum DPAN DA SA Sec
945 * 2 + 1 + 2 + 8 + 8 + 0 = 21
946 */
947 return 21;
948}
949
950static int
951lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
952 int mlen, int plen, int offset)
953{
954 struct sk_buff *frag;
955 int hlen, ret;
956
957 /* if payload length is zero, therefore it's a first fragment */
958 hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
959
960 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
961
962 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
963 if (!frag)
964 return -ENOMEM;
965
966 frag->priority = skb->priority;
967 frag->dev = skb->dev;
968
969 /* copy header, MFR and payload */
970 memcpy(skb_put(frag, mlen), skb->data, mlen);
971 memcpy(skb_put(frag, hlen), head, hlen);
972
973 if (plen)
974 skb_copy_from_linear_data_offset(skb, offset + mlen,
975 skb_put(frag, plen), plen);
976
977 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
978 frag->len);
979
980 ret = dev_queue_xmit(frag);
981
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000982 return ret;
983}
984
985static int
986lowpan_skb_fragmentation(struct sk_buff *skb)
987{
988 int err, header_length, payload_length, tag, offset = 0;
989 u8 head[5];
990
991 header_length = lowpan_get_mac_header_length(skb);
992 payload_length = skb->len - header_length;
993 tag = fragment_tag++;
994
995 /* first fragment header */
996 head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7);
997 head[1] = (payload_length >> 3) & 0xff;
998 head[2] = tag & 0xff;
999 head[3] = tag >> 8;
1000
1001 err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
1002
1003 /* next fragment header */
1004 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1005 head[0] |= LOWPAN_DISPATCH_FRAGN;
1006
1007 while ((payload_length - offset > 0) && (err >= 0)) {
1008 int len = LOWPAN_FRAG_SIZE;
1009
1010 head[4] = offset / 8;
1011
1012 if (payload_length - offset < len)
1013 len = payload_length - offset;
1014
1015 err = lowpan_fragment_xmit(skb, head, header_length,
1016 len, offset);
1017 offset += len;
1018 }
1019
1020 return err;
1021}
1022
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001023static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1024{
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001025 int err = -1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001026
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001027 pr_debug("package xmit\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001028
1029 skb->dev = lowpan_dev_info(dev)->real_dev;
1030 if (skb->dev == NULL) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001031 pr_debug("ERROR: no real wpan device found\n");
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001032 goto error;
1033 }
1034
1035 if (skb->len <= IEEE802154_MTU) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001036 err = dev_queue_xmit(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001037 goto out;
1038 }
1039
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001040 pr_debug("frame is too big, fragmentation is needed\n");
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001041 err = lowpan_skb_fragmentation(skb);
1042error:
1043 dev_kfree_skb(skb);
1044out:
1045 if (err < 0)
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001046 pr_debug("ERROR: xmit failed\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001047
1048 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
1049}
1050
1051static void lowpan_dev_free(struct net_device *dev)
1052{
1053 dev_put(lowpan_dev_info(dev)->real_dev);
1054 free_netdev(dev);
1055}
1056
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001057static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
1058{
1059 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1060 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
1061}
1062
1063static u16 lowpan_get_pan_id(const struct net_device *dev)
1064{
1065 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1066 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
1067}
1068
1069static u16 lowpan_get_short_addr(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_short_addr(real_dev);
1073}
1074
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001075static struct header_ops lowpan_header_ops = {
1076 .create = lowpan_header_create,
1077};
1078
1079static const struct net_device_ops lowpan_netdev_ops = {
1080 .ndo_start_xmit = lowpan_xmit,
Danny Kukawkacdf49c22012-02-22 02:36:39 +00001081 .ndo_set_mac_address = eth_mac_addr,
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001082};
1083
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001084static struct ieee802154_mlme_ops lowpan_mlme = {
1085 .get_pan_id = lowpan_get_pan_id,
1086 .get_phy = lowpan_get_phy,
1087 .get_short_addr = lowpan_get_short_addr,
1088};
1089
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001090static void lowpan_setup(struct net_device *dev)
1091{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001092 dev->addr_len = IEEE802154_ADDR_LEN;
1093 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1094 dev->type = ARPHRD_IEEE802154;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001095 /* Frame Control + Sequence Number + Address fields + Security Header */
1096 dev->hard_header_len = 2 + 1 + 20 + 14;
1097 dev->needed_tailroom = 2; /* FCS */
1098 dev->mtu = 1281;
1099 dev->tx_queue_len = 0;
alex.bluesman.smirnov@gmail.com4d039f62011-11-10 07:39:37 +00001100 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001101 dev->watchdog_timeo = 0;
1102
1103 dev->netdev_ops = &lowpan_netdev_ops;
1104 dev->header_ops = &lowpan_header_ops;
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001105 dev->ml_priv = &lowpan_mlme;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001106 dev->destructor = lowpan_dev_free;
1107}
1108
1109static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1110{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001111 if (tb[IFLA_ADDRESS]) {
1112 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1113 return -EINVAL;
1114 }
1115 return 0;
1116}
1117
1118static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1119 struct packet_type *pt, struct net_device *orig_dev)
1120{
1121 if (!netif_running(dev))
1122 goto drop;
1123
1124 if (dev->type != ARPHRD_IEEE802154)
1125 goto drop;
1126
1127 /* check that it's our buffer */
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001128 switch (skb->data[0] & 0xe0) {
1129 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1130 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1131 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001132 lowpan_process_data(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001133 break;
1134 default:
1135 break;
1136 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001137
1138 return NET_RX_SUCCESS;
1139
1140drop:
1141 kfree_skb(skb);
1142 return NET_RX_DROP;
1143}
1144
1145static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1146 struct nlattr *tb[], struct nlattr *data[])
1147{
1148 struct net_device *real_dev;
1149 struct lowpan_dev_record *entry;
1150
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001151 pr_debug("adding new link\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001152
1153 if (!tb[IFLA_LINK])
1154 return -EINVAL;
1155 /* find and hold real wpan device */
1156 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1157 if (!real_dev)
1158 return -ENODEV;
1159
1160 lowpan_dev_info(dev)->real_dev = real_dev;
1161 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1162
1163 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001164 if (!entry) {
1165 dev_put(real_dev);
1166 lowpan_dev_info(dev)->real_dev = NULL;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001167 return -ENOMEM;
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001168 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001169
1170 entry->ldev = dev;
1171
1172 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1173 INIT_LIST_HEAD(&entry->list);
1174 list_add_tail(&entry->list, &lowpan_devices);
1175 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1176
alex.bluesman.smirnov@gmail.com768f7c72012-04-25 23:24:58 +00001177 spin_lock_init(&flist_lock);
1178
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001179 register_netdevice(dev);
1180
1181 return 0;
1182}
1183
1184static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1185{
1186 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1187 struct net_device *real_dev = lowpan_dev->real_dev;
alex.bluesman.smirnov@gmail.com8deff4a2012-04-25 23:24:57 +00001188 struct lowpan_dev_record *entry, *tmp;
1189 struct lowpan_fragment *frame, *tframe;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001190
1191 ASSERT_RTNL();
1192
alex.bluesman.smirnov@gmail.com8deff4a2012-04-25 23:24:57 +00001193 spin_lock(&flist_lock);
1194 list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
1195 del_timer(&frame->timer);
1196 list_del(&frame->list);
1197 dev_kfree_skb(frame->skb);
1198 kfree(frame);
1199 }
1200 spin_unlock(&flist_lock);
1201
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001202 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
Dan Carpenteraec9db32011-08-30 03:46:40 +00001203 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001204 if (entry->ldev == dev) {
1205 list_del(&entry->list);
1206 kfree(entry);
1207 }
Dan Carpenteraec9db32011-08-30 03:46:40 +00001208 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001209 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1210
1211 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1212
1213 unregister_netdevice_queue(dev, head);
1214
1215 dev_put(real_dev);
1216}
1217
1218static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1219 .kind = "lowpan",
1220 .priv_size = sizeof(struct lowpan_dev_info),
1221 .setup = lowpan_setup,
1222 .newlink = lowpan_newlink,
1223 .dellink = lowpan_dellink,
1224 .validate = lowpan_validate,
1225};
1226
1227static inline int __init lowpan_netlink_init(void)
1228{
1229 return rtnl_link_register(&lowpan_link_ops);
1230}
1231
1232static inline void __init lowpan_netlink_fini(void)
1233{
1234 rtnl_link_unregister(&lowpan_link_ops);
1235}
1236
1237static struct packet_type lowpan_packet_type = {
1238 .type = __constant_htons(ETH_P_IEEE802154),
1239 .func = lowpan_rcv,
1240};
1241
1242static int __init lowpan_init_module(void)
1243{
1244 int err = 0;
1245
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001246 err = lowpan_netlink_init();
1247 if (err < 0)
1248 goto out;
1249
1250 dev_add_pack(&lowpan_packet_type);
1251out:
1252 return err;
1253}
1254
1255static void __exit lowpan_cleanup_module(void)
1256{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001257 lowpan_netlink_fini();
1258
1259 dev_remove_pack(&lowpan_packet_type);
1260}
1261
1262module_init(lowpan_init_module);
1263module_exit(lowpan_cleanup_module);
1264MODULE_LICENSE("GPL");
1265MODULE_ALIAS_RTNL_LINK("lowpan");