blob: f651da60f1618f089c2d21eef069ac5b3648218d [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>
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 */
66static const u8 lowpan_ttl_values[] = {0, 1, 64, 255};
67
68static 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 */
80static 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 */
89static 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 */
98static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
99
100/* Link local prefix */
101static const u8 lowpan_llprefix[] = {0xfe, 0x80};
102
103/* private device info */
104struct lowpan_dev_info {
105 struct net_device *real_dev; /* real WPAN device ptr */
106 struct mutex dev_list_mtx; /* mutex for list ops */
107};
108
109struct lowpan_dev_record {
110 struct net_device *ldev;
111 struct list_head list;
112};
113
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000114struct lowpan_fragment {
115 struct sk_buff *skb; /* skb to be assembled */
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000116 u16 length; /* length to be assemled */
117 u32 bytes_rcv; /* bytes received */
118 u16 tag; /* current fragment tag */
119 struct timer_list timer; /* assembling timer */
120 struct list_head list; /* fragments list */
121};
122
123static unsigned short fragment_tag;
124static LIST_HEAD(lowpan_fragments);
alex.bluesman.smirnov@gmail.com4d27de12012-07-10 21:22:42 +0000125static DEFINE_SPINLOCK(flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000126
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700127static inline struct
128lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
129{
130 return netdev_priv(dev);
131}
132
133static 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 */
142static 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 */
160static 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
171static u8
172lowpan_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
194static void
195lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr)
196{
alex.bluesman.smirnov@gmail.com2d319502012-04-25 23:35:51 +0000197 memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700198 /* 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 */
209static int
210lowpan_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",
alex.bluesman.smirnov@gmail.com2d319502012-04-25 23:35:51 +0000222 lladdr, IEEE802154_ADDR_LEN);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700223 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
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000241 pr_debug("uncompressing %d + %d => ", prefcount, postcount);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700242 lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
243
244 return 0;
245}
246
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000247static void
248lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
249{
250 struct udphdr *uh = udp_hdr(skb);
251
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000252 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)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000256 pr_debug("UDP header: both ports compression to 4 bits\n");
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000257 **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) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000264 pr_debug("UDP header: remove 8 bits of dest\n");
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000265 **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) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000271 pr_debug("UDP header: remove 8 bits of source\n");
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000272 **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 {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000277 pr_debug("UDP header: can't compress\n");
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000278 **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
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000289static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700290{
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000291 if (unlikely(!pskb_may_pull(skb, 1)))
292 return -EINVAL;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700293
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000294 *val = skb->data[0];
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700295 skb_pull(skb, 1);
296
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000297 return 0;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700298}
299
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000300static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000301{
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000302 if (unlikely(!pskb_may_pull(skb, 2)))
303 return -EINVAL;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000304
Tony Cheneau45760392012-07-11 06:51:15 +0000305 *val = (skb->data[0] << 8) | skb->data[1];
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000306 skb_pull(skb, 2);
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000307
308 return 0;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000309}
310
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000311static int
312lowpan_uncompress_udp_header(struct sk_buff *skb)
313{
314 struct udphdr *uh = udp_hdr(skb);
315 u8 tmp;
316
Tony Cheneaud4787a12012-07-11 06:51:14 +0000317 if (!uh)
318 goto err;
319
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000320 if (lowpan_fetch_skb_u8(skb, &tmp))
321 goto err;
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000322
323 if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000324 pr_debug("UDP header uncompression\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000325 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:
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000350 pr_debug("ERROR: unknown UDP format\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000351 goto err;
352 break;
353 }
354
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000355 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
356 uh->source, uh->dest);
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000357
358 /* copy checksum */
359 memcpy(&uh->check, &skb->data[0], 2);
360 skb_pull(skb, 2);
361 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000362 pr_debug("ERROR: unsupported NH format\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000363 goto err;
364 }
365
366 return 0;
367err:
368 return -EINVAL;
369}
370
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700371static int lowpan_header_create(struct sk_buff *skb,
372 struct net_device *dev,
373 unsigned short type, const void *_daddr,
Eric Dumazet95c96172012-04-15 05:58:06 +0000374 const void *_saddr, unsigned int len)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700375{
376 u8 tmp, iphc0, iphc1, *hc06_ptr;
377 struct ipv6hdr *hdr;
378 const u8 *saddr = _saddr;
379 const u8 *daddr = _daddr;
380 u8 *head;
381 struct ieee802154_addr sa, da;
382
383 if (type != ETH_P_IPV6)
384 return 0;
385 /* TODO:
386 * if this package isn't ipv6 one, where should it be routed?
387 */
388 head = kzalloc(100, GFP_KERNEL);
389 if (head == NULL)
390 return -ENOMEM;
391
392 hdr = ipv6_hdr(skb);
393 hc06_ptr = head + 2;
394
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000395 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
396 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
397 ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700398
399 lowpan_raw_dump_table(__func__, "raw skb network header dump",
400 skb_network_header(skb), sizeof(struct ipv6hdr));
401
402 if (!saddr)
403 saddr = dev->dev_addr;
404
405 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
406
407 /*
408 * As we copy some bit-length fields, in the IPHC encoding bytes,
409 * we sometimes use |=
410 * If the field is 0, and the current bit value in memory is 1,
411 * this does not work. We therefore reset the IPHC encoding here
412 */
413 iphc0 = LOWPAN_DISPATCH_IPHC;
414 iphc1 = 0;
415
416 /* TODO: context lookup */
417
418 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
419
420 /*
421 * Traffic class, flow label
422 * If flow label is 0, compress it. If traffic class is 0, compress it
423 * We have to process both in the same time as the offset of traffic
424 * class depends on the presence of version and flow label
425 */
426
427 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
428 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
429 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
430
431 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
432 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
433 /* flow label can be compressed */
434 iphc0 |= LOWPAN_IPHC_FL_C;
435 if ((hdr->priority == 0) &&
436 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
437 /* compress (elide) all */
438 iphc0 |= LOWPAN_IPHC_TC_C;
439 } else {
440 /* compress only the flow label */
441 *hc06_ptr = tmp;
442 hc06_ptr += 1;
443 }
444 } else {
445 /* Flow label cannot be compressed */
446 if ((hdr->priority == 0) &&
447 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
448 /* compress only traffic class */
449 iphc0 |= LOWPAN_IPHC_TC_C;
450 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
451 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
452 hc06_ptr += 3;
453 } else {
454 /* compress nothing */
455 memcpy(hc06_ptr, &hdr, 4);
456 /* replace the top byte with new ECN | DSCP format */
457 *hc06_ptr = tmp;
458 hc06_ptr += 4;
459 }
460 }
461
462 /* NOTE: payload length is always compressed */
463
464 /* Next Header is compress if UDP */
465 if (hdr->nexthdr == UIP_PROTO_UDP)
466 iphc0 |= LOWPAN_IPHC_NH_C;
467
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700468 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
469 *hc06_ptr = hdr->nexthdr;
470 hc06_ptr += 1;
471 }
472
473 /*
474 * Hop limit
475 * if 1: compress, encoding is 01
476 * if 64: compress, encoding is 10
477 * if 255: compress, encoding is 11
478 * else do not compress
479 */
480 switch (hdr->hop_limit) {
481 case 1:
482 iphc0 |= LOWPAN_IPHC_TTL_1;
483 break;
484 case 64:
485 iphc0 |= LOWPAN_IPHC_TTL_64;
486 break;
487 case 255:
488 iphc0 |= LOWPAN_IPHC_TTL_255;
489 break;
490 default:
491 *hc06_ptr = hdr->hop_limit;
alex.bluesman.smirnov@gmail.com5c00c0c2012-06-25 03:49:02 +0000492 hc06_ptr += 1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700493 break;
494 }
495
496 /* source address compression */
497 if (is_addr_unspecified(&hdr->saddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000498 pr_debug("source address is unspecified, setting SAC\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700499 iphc1 |= LOWPAN_IPHC_SAC;
500 /* TODO: context lookup */
501 } else if (is_addr_link_local(&hdr->saddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000502 pr_debug("source address is link-local\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700503 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
504 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
505 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000506 pr_debug("send the full source address\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700507 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
508 hc06_ptr += 16;
509 }
510
511 /* destination address compression */
512 if (is_addr_mcast(&hdr->daddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000513 pr_debug("destination address is multicast: ");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700514 iphc1 |= LOWPAN_IPHC_M;
515 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
516 pr_debug("compressed to 1 octet\n");
517 iphc1 |= LOWPAN_IPHC_DAM_11;
518 /* use last byte */
519 *hc06_ptr = hdr->daddr.s6_addr[15];
520 hc06_ptr += 1;
521 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
522 pr_debug("compressed to 4 octets\n");
523 iphc1 |= LOWPAN_IPHC_DAM_10;
524 /* second byte + the last three */
525 *hc06_ptr = hdr->daddr.s6_addr[1];
526 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
527 hc06_ptr += 4;
528 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
529 pr_debug("compressed to 6 octets\n");
530 iphc1 |= LOWPAN_IPHC_DAM_01;
531 /* second byte + the last five */
532 *hc06_ptr = hdr->daddr.s6_addr[1];
533 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
534 hc06_ptr += 6;
535 } else {
536 pr_debug("using full address\n");
537 iphc1 |= LOWPAN_IPHC_DAM_00;
538 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
539 hc06_ptr += 16;
540 }
541 } else {
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700542 /* TODO: context lookup */
543 if (is_addr_link_local(&hdr->daddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000544 pr_debug("dest address is unicast and link-local\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700545 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
546 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
547 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000548 pr_debug("dest address is unicast: using full one\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700549 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
550 hc06_ptr += 16;
551 }
552 }
553
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000554 /* UDP header compression */
555 if (hdr->nexthdr == UIP_PROTO_UDP)
556 lowpan_compress_udp_header(&hc06_ptr, skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700557
558 head[0] = iphc0;
559 head[1] = iphc1;
560
561 skb_pull(skb, sizeof(struct ipv6hdr));
562 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
563
564 kfree(head);
565
566 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
567 skb->len);
568
569 /*
570 * NOTE1: I'm still unsure about the fact that compression and WPAN
571 * header are created here and not later in the xmit. So wait for
572 * an opinion of net maintainers.
573 */
574 /*
575 * NOTE2: to be absolutely correct, we must derive PANid information
576 * from MAC subif of the 'dev' and 'real_dev' network devices, but
577 * this isn't implemented in mainline yet, so currently we assign 0xff
578 */
579 {
580 /* prepare wpan address data */
581 sa.addr_type = IEEE802154_ADDR_LONG;
582 sa.pan_id = 0xff;
583
584 da.addr_type = IEEE802154_ADDR_LONG;
585 da.pan_id = 0xff;
586
587 memcpy(&(da.hwaddr), daddr, 8);
588 memcpy(&(sa.hwaddr), saddr, 8);
589
590 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000591
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700592 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
593 type, (void *)&da, (void *)&sa, skb->len);
594 }
595}
596
597static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
598{
599 struct sk_buff *new;
600 struct lowpan_dev_record *entry;
601 int stat = NET_RX_SUCCESS;
602
603 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000604 GFP_ATOMIC);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700605 kfree_skb(skb);
606
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000607 if (!new)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700608 return -ENOMEM;
609
610 skb_push(new, sizeof(struct ipv6hdr));
611 skb_reset_network_header(new);
612 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
613
614 new->protocol = htons(ETH_P_IPV6);
615 new->pkt_type = PACKET_HOST;
616
617 rcu_read_lock();
618 list_for_each_entry_rcu(entry, &lowpan_devices, list)
619 if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000620 skb = skb_copy(new, GFP_ATOMIC);
621 if (!skb) {
622 stat = -ENOMEM;
623 break;
624 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700625
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000626 skb->dev = entry->ldev;
627 stat = netif_rx(skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700628 }
629 rcu_read_unlock();
630
631 kfree_skb(new);
632
633 return stat;
634}
635
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000636static void lowpan_fragment_timer_expired(unsigned long entry_addr)
637{
638 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
639
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000640 pr_debug("timer expired for frame with tag %d\n", entry->tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000641
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000642 list_del(&entry->list);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000643 dev_kfree_skb(entry->skb);
644 kfree(entry);
645}
646
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000647static struct lowpan_fragment *
Tony Cheneau5e968552012-07-11 06:51:16 +0000648lowpan_alloc_new_frame(struct sk_buff *skb, u8 len, u16 tag)
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000649{
650 struct lowpan_fragment *frame;
651
652 frame = kzalloc(sizeof(struct lowpan_fragment),
653 GFP_ATOMIC);
654 if (!frame)
655 goto frame_err;
656
657 INIT_LIST_HEAD(&frame->list);
658
Tony Cheneau5e968552012-07-11 06:51:16 +0000659 frame->length = len;
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000660 frame->tag = tag;
661
662 /* allocate buffer for frame assembling */
alex.bluesman.smirnov@gmail.com79ff1db2012-07-10 21:22:45 +0000663 frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length +
664 sizeof(struct ipv6hdr));
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000665
666 if (!frame->skb)
667 goto skb_err;
668
669 frame->skb->priority = skb->priority;
670 frame->skb->dev = skb->dev;
671
672 /* reserve headroom for uncompressed ipv6 header */
673 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
674 skb_put(frame->skb, frame->length);
675
676 init_timer(&frame->timer);
677 /* time out is the same as for ipv6 - 60 sec */
678 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
679 frame->timer.data = (unsigned long)frame;
680 frame->timer.function = lowpan_fragment_timer_expired;
681
682 add_timer(&frame->timer);
683
684 list_add_tail(&frame->list, &lowpan_fragments);
685
686 return frame;
687
688skb_err:
689 kfree(frame);
690frame_err:
691 return NULL;
692}
693
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700694static int
695lowpan_process_data(struct sk_buff *skb)
696{
697 struct ipv6hdr hdr;
698 u8 tmp, iphc0, iphc1, num_context = 0;
699 u8 *_saddr, *_daddr;
700 int err;
701
702 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
703 skb->len);
704 /* at least two bytes will be used for the encoding */
705 if (skb->len < 2)
706 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000707
708 if (lowpan_fetch_skb_u8(skb, &iphc0))
709 goto drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000710
711 /* fragments assembling */
712 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
713 case LOWPAN_DISPATCH_FRAG1:
714 case LOWPAN_DISPATCH_FRAGN:
715 {
716 struct lowpan_fragment *frame;
Tony Cheneau5e968552012-07-11 06:51:16 +0000717 /* slen stores the rightmost 8 bits of the 11 bits length */
718 u8 slen, offset;
719 u16 len, tag;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000720 bool found = false;
721
Tony Cheneau5e968552012-07-11 06:51:16 +0000722 if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000723 lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
724 goto drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000725
Tony Cheneau5e968552012-07-11 06:51:16 +0000726 /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
727 len = ((iphc0 & 7) << 8) | slen;
728
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000729 /*
730 * check if frame assembling with the same tag is
731 * already in progress
732 */
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000733 spin_lock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000734
735 list_for_each_entry(frame, &lowpan_fragments, list)
736 if (frame->tag == tag) {
737 found = true;
738 break;
739 }
740
741 /* alloc new frame structure */
742 if (!found) {
Tony Cheneau5e968552012-07-11 06:51:16 +0000743 frame = lowpan_alloc_new_frame(skb, len, tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000744 if (!frame)
745 goto unlock_and_drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000746 }
747
748 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
749 goto unlock_and_drop;
750
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000751 if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */
752 goto unlock_and_drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000753
754 /* if payload fits buffer, copy it */
755 if (likely((offset * 8 + skb->len) <= frame->length))
756 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
757 skb->data, skb->len);
758 else
759 goto unlock_and_drop;
760
761 frame->bytes_rcv += skb->len;
762
763 /* frame assembling complete */
764 if ((frame->bytes_rcv == frame->length) &&
765 frame->timer.expires > jiffies) {
766 /* if timer haven't expired - first of all delete it */
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000767 del_timer_sync(&frame->timer);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000768 list_del(&frame->list);
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000769 spin_unlock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000770
771 dev_kfree_skb(skb);
772 skb = frame->skb;
773 kfree(frame);
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000774
775 if (lowpan_fetch_skb_u8(skb, &iphc0))
Dan Carpenter747cf6e2012-06-26 20:53:09 +0000776 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000777
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000778 break;
779 }
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000780 spin_unlock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000781
782 return kfree_skb(skb), 0;
783 }
784 default:
785 break;
786 }
787
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000788 if (lowpan_fetch_skb_u8(skb, &iphc1))
789 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700790
791 _saddr = mac_cb(skb)->sa.hwaddr;
792 _daddr = mac_cb(skb)->da.hwaddr;
793
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000794 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700795
796 /* another if the CID flag is set */
797 if (iphc1 & LOWPAN_IPHC_CID) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000798 pr_debug("CID flag is set, increase header with one\n");
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000799 if (lowpan_fetch_skb_u8(skb, &num_context))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700800 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700801 }
802
803 hdr.version = 6;
804
805 /* Traffic Class and Flow Label */
806 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
807 /*
808 * Traffic Class and FLow Label carried in-line
809 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
810 */
811 case 0: /* 00b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000812 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700813 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000814
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700815 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
816 skb_pull(skb, 3);
817 hdr.priority = ((tmp >> 2) & 0x0f);
818 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
819 (hdr.flow_lbl[0] & 0x0f);
820 break;
821 /*
822 * Traffic class carried in-line
823 * ECN + DSCP (1 byte), Flow Label is elided
824 */
825 case 1: /* 10b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000826 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700827 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000828
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700829 hdr.priority = ((tmp >> 2) & 0x0f);
830 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
831 hdr.flow_lbl[1] = 0;
832 hdr.flow_lbl[2] = 0;
833 break;
834 /*
835 * Flow Label carried in-line
836 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
837 */
838 case 2: /* 01b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000839 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700840 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000841
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700842 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
843 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
844 skb_pull(skb, 2);
845 break;
846 /* Traffic Class and Flow Label are elided */
847 case 3: /* 11b */
848 hdr.priority = 0;
849 hdr.flow_lbl[0] = 0;
850 hdr.flow_lbl[1] = 0;
851 hdr.flow_lbl[2] = 0;
852 break;
853 default:
854 break;
855 }
856
857 /* Next Header */
858 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
859 /* Next header is carried inline */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000860 if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700861 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000862
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000863 pr_debug("NH flag is set, next header carried inline: %02x\n",
864 hdr.nexthdr);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700865 }
866
867 /* Hop Limit */
868 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
869 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
870 else {
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000871 if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700872 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700873 }
874
875 /* Extract SAM to the tmp variable */
876 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
877
878 /* Source address uncompression */
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000879 pr_debug("source address stateless compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700880 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
881 lowpan_unc_llconf[tmp], skb->data);
882 if (err)
883 goto drop;
884
885 /* Extract DAM to the tmp variable */
886 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
887
888 /* check for Multicast Compression */
889 if (iphc1 & LOWPAN_IPHC_M) {
890 if (iphc1 & LOWPAN_IPHC_DAC) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000891 pr_debug("dest: context-based mcast compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700892 /* TODO: implement this */
893 } else {
894 u8 prefix[] = {0xff, 0x02};
895
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000896 pr_debug("dest: non context-based mcast compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700897 if (0 < tmp && tmp < 3) {
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000898 if (lowpan_fetch_skb_u8(skb, &prefix[1]))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700899 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700900 }
901
902 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
903 lowpan_unc_mxconf[tmp], NULL);
904 if (err)
905 goto drop;
906 }
907 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000908 pr_debug("dest: stateless compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700909 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
910 lowpan_unc_llconf[tmp], skb->data);
911 if (err)
912 goto drop;
913 }
914
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000915 /* UDP data uncompression */
916 if (iphc0 & LOWPAN_IPHC_NH_C)
917 if (lowpan_uncompress_udp_header(skb))
918 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700919
920 /* Not fragmented package */
921 hdr.payload_len = htons(skb->len);
922
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000923 pr_debug("skb headroom size = %d, data length = %d\n",
924 skb_headroom(skb), skb->len);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700925
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000926 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
927 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700928 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
929
930 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
931 sizeof(hdr));
932 return lowpan_skb_deliver(skb, &hdr);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000933
934unlock_and_drop:
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000935 spin_unlock_bh(&flist_lock);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700936drop:
Dan Carpenter90d09632011-08-30 03:45:52 +0000937 kfree_skb(skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700938 return -EINVAL;
939}
940
alex.bluesman.smirnov@gmail.com42c36292012-07-01 19:58:46 +0000941static int lowpan_set_address(struct net_device *dev, void *p)
942{
943 struct sockaddr *sa = p;
944
945 if (netif_running(dev))
946 return -EBUSY;
947
948 /* TODO: validate addr */
949 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
950
951 return 0;
952}
953
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000954static int lowpan_get_mac_header_length(struct sk_buff *skb)
955{
956 /*
957 * Currently long addressing mode is supported only, so the overall
958 * header size is 21:
959 * FC SeqNum DPAN DA SA Sec
960 * 2 + 1 + 2 + 8 + 8 + 0 = 21
961 */
962 return 21;
963}
964
965static int
966lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
967 int mlen, int plen, int offset)
968{
969 struct sk_buff *frag;
970 int hlen, ret;
971
972 /* if payload length is zero, therefore it's a first fragment */
973 hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
974
975 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
976
977 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
978 if (!frag)
979 return -ENOMEM;
980
981 frag->priority = skb->priority;
982 frag->dev = skb->dev;
983
984 /* copy header, MFR and payload */
985 memcpy(skb_put(frag, mlen), skb->data, mlen);
986 memcpy(skb_put(frag, hlen), head, hlen);
987
988 if (plen)
989 skb_copy_from_linear_data_offset(skb, offset + mlen,
990 skb_put(frag, plen), plen);
991
992 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
993 frag->len);
994
995 ret = dev_queue_xmit(frag);
996
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000997 return ret;
998}
999
1000static int
1001lowpan_skb_fragmentation(struct sk_buff *skb)
1002{
1003 int err, header_length, payload_length, tag, offset = 0;
1004 u8 head[5];
1005
1006 header_length = lowpan_get_mac_header_length(skb);
1007 payload_length = skb->len - header_length;
1008 tag = fragment_tag++;
1009
1010 /* first fragment header */
Tony Cheneau5e968552012-07-11 06:51:16 +00001011 head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7);
1012 head[1] = payload_length & 0xff;
Tony Cheneau45760392012-07-11 06:51:15 +00001013 head[2] = tag >> 8;
1014 head[3] = tag & 0xff;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001015
1016 err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
1017
1018 /* next fragment header */
1019 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1020 head[0] |= LOWPAN_DISPATCH_FRAGN;
1021
1022 while ((payload_length - offset > 0) && (err >= 0)) {
1023 int len = LOWPAN_FRAG_SIZE;
1024
1025 head[4] = offset / 8;
1026
1027 if (payload_length - offset < len)
1028 len = payload_length - offset;
1029
1030 err = lowpan_fragment_xmit(skb, head, header_length,
1031 len, offset);
1032 offset += len;
1033 }
1034
1035 return err;
1036}
1037
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001038static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1039{
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001040 int err = -1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001041
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001042 pr_debug("package xmit\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001043
1044 skb->dev = lowpan_dev_info(dev)->real_dev;
1045 if (skb->dev == NULL) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001046 pr_debug("ERROR: no real wpan device found\n");
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001047 goto error;
1048 }
1049
Alan Ottb333b7e2012-11-29 15:55:44 +00001050 /* Send directly if less than the MTU minus the 2 checksum bytes. */
1051 if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001052 err = dev_queue_xmit(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001053 goto out;
1054 }
1055
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001056 pr_debug("frame is too big, fragmentation is needed\n");
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001057 err = lowpan_skb_fragmentation(skb);
1058error:
1059 dev_kfree_skb(skb);
1060out:
1061 if (err < 0)
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001062 pr_debug("ERROR: xmit failed\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001063
1064 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
1065}
1066
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001067static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
1068{
1069 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1070 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
1071}
1072
1073static u16 lowpan_get_pan_id(const struct net_device *dev)
1074{
1075 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1076 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
1077}
1078
1079static u16 lowpan_get_short_addr(const struct net_device *dev)
1080{
1081 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1082 return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
1083}
1084
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001085static struct header_ops lowpan_header_ops = {
1086 .create = lowpan_header_create,
1087};
1088
1089static const struct net_device_ops lowpan_netdev_ops = {
1090 .ndo_start_xmit = lowpan_xmit,
alex.bluesman.smirnov@gmail.com42c36292012-07-01 19:58:46 +00001091 .ndo_set_mac_address = lowpan_set_address,
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001092};
1093
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001094static struct ieee802154_mlme_ops lowpan_mlme = {
1095 .get_pan_id = lowpan_get_pan_id,
1096 .get_phy = lowpan_get_phy,
1097 .get_short_addr = lowpan_get_short_addr,
1098};
1099
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001100static void lowpan_setup(struct net_device *dev)
1101{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001102 dev->addr_len = IEEE802154_ADDR_LEN;
1103 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1104 dev->type = ARPHRD_IEEE802154;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001105 /* Frame Control + Sequence Number + Address fields + Security Header */
1106 dev->hard_header_len = 2 + 1 + 20 + 14;
1107 dev->needed_tailroom = 2; /* FCS */
1108 dev->mtu = 1281;
1109 dev->tx_queue_len = 0;
alex.bluesman.smirnov@gmail.com4d039f62011-11-10 07:39:37 +00001110 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001111 dev->watchdog_timeo = 0;
1112
1113 dev->netdev_ops = &lowpan_netdev_ops;
1114 dev->header_ops = &lowpan_header_ops;
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001115 dev->ml_priv = &lowpan_mlme;
Alan Otta2dc375e2012-09-01 05:57:07 +00001116 dev->destructor = free_netdev;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001117}
1118
1119static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1120{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001121 if (tb[IFLA_ADDRESS]) {
1122 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1123 return -EINVAL;
1124 }
1125 return 0;
1126}
1127
1128static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1129 struct packet_type *pt, struct net_device *orig_dev)
1130{
Alan Otta437d272012-09-01 05:57:06 +00001131 struct sk_buff *local_skb;
1132
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001133 if (!netif_running(dev))
1134 goto drop;
1135
1136 if (dev->type != ARPHRD_IEEE802154)
1137 goto drop;
1138
1139 /* check that it's our buffer */
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001140 switch (skb->data[0] & 0xe0) {
1141 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1142 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1143 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
Alan Otta437d272012-09-01 05:57:06 +00001144 local_skb = skb_clone(skb, GFP_ATOMIC);
1145 if (!local_skb)
1146 goto drop;
1147 lowpan_process_data(local_skb);
1148
1149 kfree_skb(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001150 break;
1151 default:
1152 break;
1153 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001154
1155 return NET_RX_SUCCESS;
1156
1157drop:
1158 kfree_skb(skb);
1159 return NET_RX_DROP;
1160}
1161
1162static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1163 struct nlattr *tb[], struct nlattr *data[])
1164{
1165 struct net_device *real_dev;
1166 struct lowpan_dev_record *entry;
1167
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001168 pr_debug("adding new link\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001169
1170 if (!tb[IFLA_LINK])
1171 return -EINVAL;
1172 /* find and hold real wpan device */
1173 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1174 if (!real_dev)
1175 return -ENODEV;
1176
1177 lowpan_dev_info(dev)->real_dev = real_dev;
1178 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1179
1180 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001181 if (!entry) {
1182 dev_put(real_dev);
1183 lowpan_dev_info(dev)->real_dev = NULL;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001184 return -ENOMEM;
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001185 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001186
1187 entry->ldev = dev;
1188
1189 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1190 INIT_LIST_HEAD(&entry->list);
1191 list_add_tail(&entry->list, &lowpan_devices);
1192 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1193
1194 register_netdevice(dev);
1195
1196 return 0;
1197}
1198
1199static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1200{
1201 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1202 struct net_device *real_dev = lowpan_dev->real_dev;
alex.bluesman.smirnov@gmail.com8deff4a2012-04-25 23:24:57 +00001203 struct lowpan_dev_record *entry, *tmp;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001204
1205 ASSERT_RTNL();
1206
1207 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
Dan Carpenteraec9db32011-08-30 03:46:40 +00001208 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001209 if (entry->ldev == dev) {
1210 list_del(&entry->list);
1211 kfree(entry);
1212 }
Dan Carpenteraec9db32011-08-30 03:46:40 +00001213 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001214 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1215
1216 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1217
1218 unregister_netdevice_queue(dev, head);
1219
1220 dev_put(real_dev);
1221}
1222
1223static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1224 .kind = "lowpan",
1225 .priv_size = sizeof(struct lowpan_dev_info),
1226 .setup = lowpan_setup,
1227 .newlink = lowpan_newlink,
1228 .dellink = lowpan_dellink,
1229 .validate = lowpan_validate,
1230};
1231
1232static inline int __init lowpan_netlink_init(void)
1233{
1234 return rtnl_link_register(&lowpan_link_ops);
1235}
1236
1237static inline void __init lowpan_netlink_fini(void)
1238{
1239 rtnl_link_unregister(&lowpan_link_ops);
1240}
1241
Alan Otta2dc375e2012-09-01 05:57:07 +00001242static int lowpan_device_event(struct notifier_block *unused,
1243 unsigned long event,
1244 void *ptr)
1245{
1246 struct net_device *dev = ptr;
1247 LIST_HEAD(del_list);
1248 struct lowpan_dev_record *entry, *tmp;
1249
1250 if (dev->type != ARPHRD_IEEE802154)
1251 goto out;
1252
1253 if (event == NETDEV_UNREGISTER) {
1254 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1255 if (lowpan_dev_info(entry->ldev)->real_dev == dev)
1256 lowpan_dellink(entry->ldev, &del_list);
1257 }
1258
1259 unregister_netdevice_many(&del_list);
Peter Senna Tschudin4c835012012-09-18 07:10:43 +00001260 }
Alan Otta2dc375e2012-09-01 05:57:07 +00001261
1262out:
1263 return NOTIFY_DONE;
1264}
1265
1266static struct notifier_block lowpan_dev_notifier = {
1267 .notifier_call = lowpan_device_event,
1268};
1269
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001270static struct packet_type lowpan_packet_type = {
1271 .type = __constant_htons(ETH_P_IEEE802154),
1272 .func = lowpan_rcv,
1273};
1274
1275static int __init lowpan_init_module(void)
1276{
1277 int err = 0;
1278
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001279 err = lowpan_netlink_init();
1280 if (err < 0)
1281 goto out;
1282
1283 dev_add_pack(&lowpan_packet_type);
Alan Otta2dc375e2012-09-01 05:57:07 +00001284
1285 err = register_netdevice_notifier(&lowpan_dev_notifier);
1286 if (err < 0) {
1287 dev_remove_pack(&lowpan_packet_type);
1288 lowpan_netlink_fini();
1289 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001290out:
1291 return err;
1292}
1293
1294static void __exit lowpan_cleanup_module(void)
1295{
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001296 struct lowpan_fragment *frame, *tframe;
1297
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001298 lowpan_netlink_fini();
1299
1300 dev_remove_pack(&lowpan_packet_type);
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001301
Alan Otta2dc375e2012-09-01 05:57:07 +00001302 unregister_netdevice_notifier(&lowpan_dev_notifier);
1303
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001304 /* Now 6lowpan packet_type is removed, so no new fragments are
1305 * expected on RX, therefore that's the time to clean incomplete
1306 * fragments.
1307 */
1308 spin_lock_bh(&flist_lock);
1309 list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
1310 del_timer_sync(&frame->timer);
1311 list_del(&frame->list);
1312 dev_kfree_skb(frame->skb);
1313 kfree(frame);
1314 }
1315 spin_unlock_bh(&flist_lock);
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001316}
1317
1318module_init(lowpan_init_module);
1319module_exit(lowpan_cleanup_module);
1320MODULE_LICENSE("GPL");
1321MODULE_ALIAS_RTNL_LINK("lowpan");