blob: 43b95ca611144920333ca6aa12bc70aa14c033b9 [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;
Alexander Aringfc4e98d2013-02-05 10:23:43 +0000380 u8 head[100];
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700381 struct ieee802154_addr sa, da;
382
Alexander Aringfc4e98d2013-02-05 10:23:43 +0000383 /* TODO:
384 * if this package isn't ipv6 one, where should it be routed?
385 */
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700386 if (type != ETH_P_IPV6)
387 return 0;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700388
389 hdr = ipv6_hdr(skb);
390 hc06_ptr = head + 2;
391
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000392 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
393 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
394 ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700395
396 lowpan_raw_dump_table(__func__, "raw skb network header dump",
397 skb_network_header(skb), sizeof(struct ipv6hdr));
398
399 if (!saddr)
400 saddr = dev->dev_addr;
401
402 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
403
404 /*
405 * As we copy some bit-length fields, in the IPHC encoding bytes,
406 * we sometimes use |=
407 * If the field is 0, and the current bit value in memory is 1,
408 * this does not work. We therefore reset the IPHC encoding here
409 */
410 iphc0 = LOWPAN_DISPATCH_IPHC;
411 iphc1 = 0;
412
413 /* TODO: context lookup */
414
415 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
416
417 /*
418 * Traffic class, flow label
419 * If flow label is 0, compress it. If traffic class is 0, compress it
420 * We have to process both in the same time as the offset of traffic
421 * class depends on the presence of version and flow label
422 */
423
424 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
425 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
426 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
427
428 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
429 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
430 /* flow label can be compressed */
431 iphc0 |= LOWPAN_IPHC_FL_C;
432 if ((hdr->priority == 0) &&
433 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
434 /* compress (elide) all */
435 iphc0 |= LOWPAN_IPHC_TC_C;
436 } else {
437 /* compress only the flow label */
438 *hc06_ptr = tmp;
439 hc06_ptr += 1;
440 }
441 } else {
442 /* Flow label cannot be compressed */
443 if ((hdr->priority == 0) &&
444 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
445 /* compress only traffic class */
446 iphc0 |= LOWPAN_IPHC_TC_C;
447 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
448 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
449 hc06_ptr += 3;
450 } else {
451 /* compress nothing */
452 memcpy(hc06_ptr, &hdr, 4);
453 /* replace the top byte with new ECN | DSCP format */
454 *hc06_ptr = tmp;
455 hc06_ptr += 4;
456 }
457 }
458
459 /* NOTE: payload length is always compressed */
460
461 /* Next Header is compress if UDP */
462 if (hdr->nexthdr == UIP_PROTO_UDP)
463 iphc0 |= LOWPAN_IPHC_NH_C;
464
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700465 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
466 *hc06_ptr = hdr->nexthdr;
467 hc06_ptr += 1;
468 }
469
470 /*
471 * Hop limit
472 * if 1: compress, encoding is 01
473 * if 64: compress, encoding is 10
474 * if 255: compress, encoding is 11
475 * else do not compress
476 */
477 switch (hdr->hop_limit) {
478 case 1:
479 iphc0 |= LOWPAN_IPHC_TTL_1;
480 break;
481 case 64:
482 iphc0 |= LOWPAN_IPHC_TTL_64;
483 break;
484 case 255:
485 iphc0 |= LOWPAN_IPHC_TTL_255;
486 break;
487 default:
488 *hc06_ptr = hdr->hop_limit;
alex.bluesman.smirnov@gmail.com5c00c0c2012-06-25 03:49:02 +0000489 hc06_ptr += 1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700490 break;
491 }
492
493 /* source address compression */
494 if (is_addr_unspecified(&hdr->saddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000495 pr_debug("source address is unspecified, setting SAC\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700496 iphc1 |= LOWPAN_IPHC_SAC;
497 /* TODO: context lookup */
498 } else if (is_addr_link_local(&hdr->saddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000499 pr_debug("source address is link-local\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700500 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
501 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
502 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000503 pr_debug("send the full source address\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700504 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
505 hc06_ptr += 16;
506 }
507
508 /* destination address compression */
509 if (is_addr_mcast(&hdr->daddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000510 pr_debug("destination address is multicast: ");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700511 iphc1 |= LOWPAN_IPHC_M;
512 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
513 pr_debug("compressed to 1 octet\n");
514 iphc1 |= LOWPAN_IPHC_DAM_11;
515 /* use last byte */
516 *hc06_ptr = hdr->daddr.s6_addr[15];
517 hc06_ptr += 1;
518 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
519 pr_debug("compressed to 4 octets\n");
520 iphc1 |= LOWPAN_IPHC_DAM_10;
521 /* second byte + the last three */
522 *hc06_ptr = hdr->daddr.s6_addr[1];
523 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
524 hc06_ptr += 4;
525 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
526 pr_debug("compressed to 6 octets\n");
527 iphc1 |= LOWPAN_IPHC_DAM_01;
528 /* second byte + the last five */
529 *hc06_ptr = hdr->daddr.s6_addr[1];
530 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
531 hc06_ptr += 6;
532 } else {
533 pr_debug("using full address\n");
534 iphc1 |= LOWPAN_IPHC_DAM_00;
535 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
536 hc06_ptr += 16;
537 }
538 } else {
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700539 /* TODO: context lookup */
540 if (is_addr_link_local(&hdr->daddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000541 pr_debug("dest address is unicast and link-local\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700542 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
543 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
544 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000545 pr_debug("dest address is unicast: using full one\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700546 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
547 hc06_ptr += 16;
548 }
549 }
550
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000551 /* UDP header compression */
552 if (hdr->nexthdr == UIP_PROTO_UDP)
553 lowpan_compress_udp_header(&hc06_ptr, skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700554
555 head[0] = iphc0;
556 head[1] = iphc1;
557
558 skb_pull(skb, sizeof(struct ipv6hdr));
559 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
560
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700561 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
562 skb->len);
563
564 /*
565 * NOTE1: I'm still unsure about the fact that compression and WPAN
566 * header are created here and not later in the xmit. So wait for
567 * an opinion of net maintainers.
568 */
569 /*
570 * NOTE2: to be absolutely correct, we must derive PANid information
571 * from MAC subif of the 'dev' and 'real_dev' network devices, but
572 * this isn't implemented in mainline yet, so currently we assign 0xff
573 */
574 {
575 /* prepare wpan address data */
576 sa.addr_type = IEEE802154_ADDR_LONG;
577 sa.pan_id = 0xff;
578
579 da.addr_type = IEEE802154_ADDR_LONG;
580 da.pan_id = 0xff;
581
582 memcpy(&(da.hwaddr), daddr, 8);
583 memcpy(&(sa.hwaddr), saddr, 8);
584
585 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000586
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700587 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
588 type, (void *)&da, (void *)&sa, skb->len);
589 }
590}
591
Alan Ott0c446212013-01-16 19:09:47 +0000592static int lowpan_give_skb_to_devices(struct sk_buff *skb)
593{
594 struct lowpan_dev_record *entry;
595 struct sk_buff *skb_cp;
596 int stat = NET_RX_SUCCESS;
597
598 rcu_read_lock();
599 list_for_each_entry_rcu(entry, &lowpan_devices, list)
600 if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
601 skb_cp = skb_copy(skb, GFP_ATOMIC);
602 if (!skb_cp) {
603 stat = -ENOMEM;
604 break;
605 }
606
607 skb_cp->dev = entry->ldev;
608 stat = netif_rx(skb_cp);
609 }
610 rcu_read_unlock();
611
612 return stat;
613}
614
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700615static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
616{
617 struct sk_buff *new;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700618 int stat = NET_RX_SUCCESS;
619
620 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000621 GFP_ATOMIC);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700622 kfree_skb(skb);
623
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000624 if (!new)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700625 return -ENOMEM;
626
627 skb_push(new, sizeof(struct ipv6hdr));
628 skb_reset_network_header(new);
629 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
630
631 new->protocol = htons(ETH_P_IPV6);
632 new->pkt_type = PACKET_HOST;
633
Alan Ott0c446212013-01-16 19:09:47 +0000634 stat = lowpan_give_skb_to_devices(new);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700635
636 kfree_skb(new);
637
638 return stat;
639}
640
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000641static void lowpan_fragment_timer_expired(unsigned long entry_addr)
642{
643 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
644
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000645 pr_debug("timer expired for frame with tag %d\n", entry->tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000646
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000647 list_del(&entry->list);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000648 dev_kfree_skb(entry->skb);
649 kfree(entry);
650}
651
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000652static struct lowpan_fragment *
Tony Cheneau5e968552012-07-11 06:51:16 +0000653lowpan_alloc_new_frame(struct sk_buff *skb, u8 len, u16 tag)
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000654{
655 struct lowpan_fragment *frame;
656
657 frame = kzalloc(sizeof(struct lowpan_fragment),
658 GFP_ATOMIC);
659 if (!frame)
660 goto frame_err;
661
662 INIT_LIST_HEAD(&frame->list);
663
Tony Cheneau5e968552012-07-11 06:51:16 +0000664 frame->length = len;
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000665 frame->tag = tag;
666
667 /* allocate buffer for frame assembling */
alex.bluesman.smirnov@gmail.com79ff1db2012-07-10 21:22:45 +0000668 frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length +
669 sizeof(struct ipv6hdr));
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000670
671 if (!frame->skb)
672 goto skb_err;
673
674 frame->skb->priority = skb->priority;
675 frame->skb->dev = skb->dev;
676
677 /* reserve headroom for uncompressed ipv6 header */
678 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
679 skb_put(frame->skb, frame->length);
680
681 init_timer(&frame->timer);
682 /* time out is the same as for ipv6 - 60 sec */
683 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
684 frame->timer.data = (unsigned long)frame;
685 frame->timer.function = lowpan_fragment_timer_expired;
686
687 add_timer(&frame->timer);
688
689 list_add_tail(&frame->list, &lowpan_fragments);
690
691 return frame;
692
693skb_err:
694 kfree(frame);
695frame_err:
696 return NULL;
697}
698
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700699static int
700lowpan_process_data(struct sk_buff *skb)
701{
702 struct ipv6hdr hdr;
703 u8 tmp, iphc0, iphc1, num_context = 0;
704 u8 *_saddr, *_daddr;
705 int err;
706
707 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
708 skb->len);
709 /* at least two bytes will be used for the encoding */
710 if (skb->len < 2)
711 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000712
713 if (lowpan_fetch_skb_u8(skb, &iphc0))
714 goto drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000715
716 /* fragments assembling */
717 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
718 case LOWPAN_DISPATCH_FRAG1:
719 case LOWPAN_DISPATCH_FRAGN:
720 {
721 struct lowpan_fragment *frame;
Tony Cheneau5e968552012-07-11 06:51:16 +0000722 /* slen stores the rightmost 8 bits of the 11 bits length */
723 u8 slen, offset;
724 u16 len, tag;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000725 bool found = false;
726
Tony Cheneau5e968552012-07-11 06:51:16 +0000727 if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000728 lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
729 goto drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000730
Tony Cheneau5e968552012-07-11 06:51:16 +0000731 /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
732 len = ((iphc0 & 7) << 8) | slen;
733
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000734 /*
735 * check if frame assembling with the same tag is
736 * already in progress
737 */
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000738 spin_lock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000739
740 list_for_each_entry(frame, &lowpan_fragments, list)
741 if (frame->tag == tag) {
742 found = true;
743 break;
744 }
745
746 /* alloc new frame structure */
747 if (!found) {
Tony Cheneau5e968552012-07-11 06:51:16 +0000748 frame = lowpan_alloc_new_frame(skb, len, tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000749 if (!frame)
750 goto unlock_and_drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000751 }
752
753 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
754 goto unlock_and_drop;
755
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000756 if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */
757 goto unlock_and_drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000758
759 /* if payload fits buffer, copy it */
760 if (likely((offset * 8 + skb->len) <= frame->length))
761 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
762 skb->data, skb->len);
763 else
764 goto unlock_and_drop;
765
766 frame->bytes_rcv += skb->len;
767
768 /* frame assembling complete */
769 if ((frame->bytes_rcv == frame->length) &&
770 frame->timer.expires > jiffies) {
771 /* if timer haven't expired - first of all delete it */
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000772 del_timer_sync(&frame->timer);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000773 list_del(&frame->list);
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000774 spin_unlock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000775
776 dev_kfree_skb(skb);
777 skb = frame->skb;
778 kfree(frame);
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000779
780 if (lowpan_fetch_skb_u8(skb, &iphc0))
Dan Carpenter747cf6e2012-06-26 20:53:09 +0000781 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000782
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000783 break;
784 }
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000785 spin_unlock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000786
787 return kfree_skb(skb), 0;
788 }
789 default:
790 break;
791 }
792
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000793 if (lowpan_fetch_skb_u8(skb, &iphc1))
794 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700795
796 _saddr = mac_cb(skb)->sa.hwaddr;
797 _daddr = mac_cb(skb)->da.hwaddr;
798
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000799 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700800
801 /* another if the CID flag is set */
802 if (iphc1 & LOWPAN_IPHC_CID) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000803 pr_debug("CID flag is set, increase header with one\n");
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000804 if (lowpan_fetch_skb_u8(skb, &num_context))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700805 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700806 }
807
808 hdr.version = 6;
809
810 /* Traffic Class and Flow Label */
811 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
812 /*
813 * Traffic Class and FLow Label carried in-line
814 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
815 */
816 case 0: /* 00b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000817 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700818 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000819
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700820 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
821 skb_pull(skb, 3);
822 hdr.priority = ((tmp >> 2) & 0x0f);
823 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
824 (hdr.flow_lbl[0] & 0x0f);
825 break;
826 /*
827 * Traffic class carried in-line
828 * ECN + DSCP (1 byte), Flow Label is elided
829 */
830 case 1: /* 10b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000831 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700832 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000833
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700834 hdr.priority = ((tmp >> 2) & 0x0f);
835 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
836 hdr.flow_lbl[1] = 0;
837 hdr.flow_lbl[2] = 0;
838 break;
839 /*
840 * Flow Label carried in-line
841 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
842 */
843 case 2: /* 01b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000844 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700845 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000846
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700847 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
848 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
849 skb_pull(skb, 2);
850 break;
851 /* Traffic Class and Flow Label are elided */
852 case 3: /* 11b */
853 hdr.priority = 0;
854 hdr.flow_lbl[0] = 0;
855 hdr.flow_lbl[1] = 0;
856 hdr.flow_lbl[2] = 0;
857 break;
858 default:
859 break;
860 }
861
862 /* Next Header */
863 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
864 /* Next header is carried inline */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000865 if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700866 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000867
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000868 pr_debug("NH flag is set, next header carried inline: %02x\n",
869 hdr.nexthdr);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700870 }
871
872 /* Hop Limit */
873 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
874 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
875 else {
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000876 if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700877 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700878 }
879
880 /* Extract SAM to the tmp variable */
881 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
882
883 /* Source address uncompression */
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000884 pr_debug("source address stateless compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700885 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
886 lowpan_unc_llconf[tmp], skb->data);
887 if (err)
888 goto drop;
889
890 /* Extract DAM to the tmp variable */
891 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
892
893 /* check for Multicast Compression */
894 if (iphc1 & LOWPAN_IPHC_M) {
895 if (iphc1 & LOWPAN_IPHC_DAC) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000896 pr_debug("dest: context-based mcast compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700897 /* TODO: implement this */
898 } else {
899 u8 prefix[] = {0xff, 0x02};
900
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000901 pr_debug("dest: non context-based mcast compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700902 if (0 < tmp && tmp < 3) {
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000903 if (lowpan_fetch_skb_u8(skb, &prefix[1]))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700904 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700905 }
906
907 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
908 lowpan_unc_mxconf[tmp], NULL);
909 if (err)
910 goto drop;
911 }
912 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000913 pr_debug("dest: stateless compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700914 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
915 lowpan_unc_llconf[tmp], skb->data);
916 if (err)
917 goto drop;
918 }
919
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000920 /* UDP data uncompression */
921 if (iphc0 & LOWPAN_IPHC_NH_C)
922 if (lowpan_uncompress_udp_header(skb))
923 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700924
925 /* Not fragmented package */
926 hdr.payload_len = htons(skb->len);
927
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000928 pr_debug("skb headroom size = %d, data length = %d\n",
929 skb_headroom(skb), skb->len);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700930
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000931 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
932 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700933 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
934
935 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
936 sizeof(hdr));
937 return lowpan_skb_deliver(skb, &hdr);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000938
939unlock_and_drop:
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000940 spin_unlock_bh(&flist_lock);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700941drop:
Dan Carpenter90d09632011-08-30 03:45:52 +0000942 kfree_skb(skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700943 return -EINVAL;
944}
945
alex.bluesman.smirnov@gmail.com42c36292012-07-01 19:58:46 +0000946static int lowpan_set_address(struct net_device *dev, void *p)
947{
948 struct sockaddr *sa = p;
949
950 if (netif_running(dev))
951 return -EBUSY;
952
953 /* TODO: validate addr */
954 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
955
956 return 0;
957}
958
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000959static int lowpan_get_mac_header_length(struct sk_buff *skb)
960{
961 /*
962 * Currently long addressing mode is supported only, so the overall
963 * header size is 21:
964 * FC SeqNum DPAN DA SA Sec
965 * 2 + 1 + 2 + 8 + 8 + 0 = 21
966 */
967 return 21;
968}
969
970static int
971lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
972 int mlen, int plen, int offset)
973{
974 struct sk_buff *frag;
975 int hlen, ret;
976
977 /* if payload length is zero, therefore it's a first fragment */
978 hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
979
980 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
981
982 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
983 if (!frag)
984 return -ENOMEM;
985
986 frag->priority = skb->priority;
987 frag->dev = skb->dev;
988
989 /* copy header, MFR and payload */
990 memcpy(skb_put(frag, mlen), skb->data, mlen);
991 memcpy(skb_put(frag, hlen), head, hlen);
992
993 if (plen)
994 skb_copy_from_linear_data_offset(skb, offset + mlen,
995 skb_put(frag, plen), plen);
996
997 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
998 frag->len);
999
1000 ret = dev_queue_xmit(frag);
1001
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001002 return ret;
1003}
1004
1005static int
1006lowpan_skb_fragmentation(struct sk_buff *skb)
1007{
1008 int err, header_length, payload_length, tag, offset = 0;
1009 u8 head[5];
1010
1011 header_length = lowpan_get_mac_header_length(skb);
1012 payload_length = skb->len - header_length;
1013 tag = fragment_tag++;
1014
1015 /* first fragment header */
Tony Cheneau5e968552012-07-11 06:51:16 +00001016 head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7);
1017 head[1] = payload_length & 0xff;
Tony Cheneau45760392012-07-11 06:51:15 +00001018 head[2] = tag >> 8;
1019 head[3] = tag & 0xff;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001020
1021 err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
1022
1023 /* next fragment header */
1024 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1025 head[0] |= LOWPAN_DISPATCH_FRAGN;
1026
1027 while ((payload_length - offset > 0) && (err >= 0)) {
1028 int len = LOWPAN_FRAG_SIZE;
1029
1030 head[4] = offset / 8;
1031
1032 if (payload_length - offset < len)
1033 len = payload_length - offset;
1034
1035 err = lowpan_fragment_xmit(skb, head, header_length,
1036 len, offset);
1037 offset += len;
1038 }
1039
1040 return err;
1041}
1042
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001043static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1044{
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001045 int err = -1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001046
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001047 pr_debug("package xmit\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001048
1049 skb->dev = lowpan_dev_info(dev)->real_dev;
1050 if (skb->dev == NULL) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001051 pr_debug("ERROR: no real wpan device found\n");
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001052 goto error;
1053 }
1054
Alan Ottb333b7e2012-11-29 15:55:44 +00001055 /* Send directly if less than the MTU minus the 2 checksum bytes. */
1056 if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001057 err = dev_queue_xmit(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001058 goto out;
1059 }
1060
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001061 pr_debug("frame is too big, fragmentation is needed\n");
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001062 err = lowpan_skb_fragmentation(skb);
1063error:
1064 dev_kfree_skb(skb);
1065out:
1066 if (err < 0)
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001067 pr_debug("ERROR: xmit failed\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001068
1069 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
1070}
1071
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001072static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
1073{
1074 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1075 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
1076}
1077
1078static u16 lowpan_get_pan_id(const struct net_device *dev)
1079{
1080 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1081 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
1082}
1083
1084static u16 lowpan_get_short_addr(const struct net_device *dev)
1085{
1086 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1087 return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
1088}
1089
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001090static struct header_ops lowpan_header_ops = {
1091 .create = lowpan_header_create,
1092};
1093
1094static const struct net_device_ops lowpan_netdev_ops = {
1095 .ndo_start_xmit = lowpan_xmit,
alex.bluesman.smirnov@gmail.com42c36292012-07-01 19:58:46 +00001096 .ndo_set_mac_address = lowpan_set_address,
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001097};
1098
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001099static struct ieee802154_mlme_ops lowpan_mlme = {
1100 .get_pan_id = lowpan_get_pan_id,
1101 .get_phy = lowpan_get_phy,
1102 .get_short_addr = lowpan_get_short_addr,
1103};
1104
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001105static void lowpan_setup(struct net_device *dev)
1106{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001107 dev->addr_len = IEEE802154_ADDR_LEN;
1108 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1109 dev->type = ARPHRD_IEEE802154;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001110 /* Frame Control + Sequence Number + Address fields + Security Header */
1111 dev->hard_header_len = 2 + 1 + 20 + 14;
1112 dev->needed_tailroom = 2; /* FCS */
1113 dev->mtu = 1281;
1114 dev->tx_queue_len = 0;
alex.bluesman.smirnov@gmail.com4d039f62011-11-10 07:39:37 +00001115 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001116 dev->watchdog_timeo = 0;
1117
1118 dev->netdev_ops = &lowpan_netdev_ops;
1119 dev->header_ops = &lowpan_header_ops;
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001120 dev->ml_priv = &lowpan_mlme;
Alan Otta2dc375e2012-09-01 05:57:07 +00001121 dev->destructor = free_netdev;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001122}
1123
1124static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1125{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001126 if (tb[IFLA_ADDRESS]) {
1127 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1128 return -EINVAL;
1129 }
1130 return 0;
1131}
1132
1133static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1134 struct packet_type *pt, struct net_device *orig_dev)
1135{
Alan Otta437d272012-09-01 05:57:06 +00001136 struct sk_buff *local_skb;
1137
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001138 if (!netif_running(dev))
1139 goto drop;
1140
1141 if (dev->type != ARPHRD_IEEE802154)
1142 goto drop;
1143
1144 /* check that it's our buffer */
Alan Ottee21c7e2013-01-16 19:09:48 +00001145 if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
1146 /* Copy the packet so that the IPv6 header is
1147 * properly aligned.
1148 */
1149 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
1150 skb_tailroom(skb), GFP_ATOMIC);
Alan Otta437d272012-09-01 05:57:06 +00001151 if (!local_skb)
1152 goto drop;
Alan Otta437d272012-09-01 05:57:06 +00001153
Alan Ottee21c7e2013-01-16 19:09:48 +00001154 local_skb->protocol = htons(ETH_P_IPV6);
1155 local_skb->pkt_type = PACKET_HOST;
1156
1157 /* Pull off the 1-byte of 6lowpan header. */
1158 skb_pull(local_skb, 1);
1159 skb_reset_network_header(local_skb);
1160 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
1161
1162 lowpan_give_skb_to_devices(local_skb);
1163
1164 kfree_skb(local_skb);
Alan Otta437d272012-09-01 05:57:06 +00001165 kfree_skb(skb);
Alan Ottee21c7e2013-01-16 19:09:48 +00001166 } else {
1167 switch (skb->data[0] & 0xe0) {
1168 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1169 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1170 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
1171 local_skb = skb_clone(skb, GFP_ATOMIC);
1172 if (!local_skb)
1173 goto drop;
1174 lowpan_process_data(local_skb);
1175
1176 kfree_skb(skb);
1177 break;
1178 default:
1179 break;
1180 }
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001181 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001182
1183 return NET_RX_SUCCESS;
1184
1185drop:
1186 kfree_skb(skb);
1187 return NET_RX_DROP;
1188}
1189
1190static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1191 struct nlattr *tb[], struct nlattr *data[])
1192{
1193 struct net_device *real_dev;
1194 struct lowpan_dev_record *entry;
1195
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001196 pr_debug("adding new link\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001197
1198 if (!tb[IFLA_LINK])
1199 return -EINVAL;
1200 /* find and hold real wpan device */
1201 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1202 if (!real_dev)
1203 return -ENODEV;
1204
1205 lowpan_dev_info(dev)->real_dev = real_dev;
1206 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1207
1208 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001209 if (!entry) {
1210 dev_put(real_dev);
1211 lowpan_dev_info(dev)->real_dev = NULL;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001212 return -ENOMEM;
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001213 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001214
1215 entry->ldev = dev;
1216
1217 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1218 INIT_LIST_HEAD(&entry->list);
1219 list_add_tail(&entry->list, &lowpan_devices);
1220 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1221
1222 register_netdevice(dev);
1223
1224 return 0;
1225}
1226
1227static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1228{
1229 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1230 struct net_device *real_dev = lowpan_dev->real_dev;
alex.bluesman.smirnov@gmail.com8deff4a2012-04-25 23:24:57 +00001231 struct lowpan_dev_record *entry, *tmp;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001232
1233 ASSERT_RTNL();
1234
1235 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
Dan Carpenteraec9db32011-08-30 03:46:40 +00001236 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001237 if (entry->ldev == dev) {
1238 list_del(&entry->list);
1239 kfree(entry);
1240 }
Dan Carpenteraec9db32011-08-30 03:46:40 +00001241 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001242 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1243
1244 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1245
1246 unregister_netdevice_queue(dev, head);
1247
1248 dev_put(real_dev);
1249}
1250
1251static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1252 .kind = "lowpan",
1253 .priv_size = sizeof(struct lowpan_dev_info),
1254 .setup = lowpan_setup,
1255 .newlink = lowpan_newlink,
1256 .dellink = lowpan_dellink,
1257 .validate = lowpan_validate,
1258};
1259
1260static inline int __init lowpan_netlink_init(void)
1261{
1262 return rtnl_link_register(&lowpan_link_ops);
1263}
1264
David S. Millera07fdce2013-02-06 15:54:38 -05001265static inline void lowpan_netlink_fini(void)
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001266{
1267 rtnl_link_unregister(&lowpan_link_ops);
1268}
1269
Alan Otta2dc375e2012-09-01 05:57:07 +00001270static int lowpan_device_event(struct notifier_block *unused,
1271 unsigned long event,
1272 void *ptr)
1273{
1274 struct net_device *dev = ptr;
1275 LIST_HEAD(del_list);
1276 struct lowpan_dev_record *entry, *tmp;
1277
1278 if (dev->type != ARPHRD_IEEE802154)
1279 goto out;
1280
1281 if (event == NETDEV_UNREGISTER) {
1282 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1283 if (lowpan_dev_info(entry->ldev)->real_dev == dev)
1284 lowpan_dellink(entry->ldev, &del_list);
1285 }
1286
1287 unregister_netdevice_many(&del_list);
Peter Senna Tschudin4c835012012-09-18 07:10:43 +00001288 }
Alan Otta2dc375e2012-09-01 05:57:07 +00001289
1290out:
1291 return NOTIFY_DONE;
1292}
1293
1294static struct notifier_block lowpan_dev_notifier = {
1295 .notifier_call = lowpan_device_event,
1296};
1297
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001298static struct packet_type lowpan_packet_type = {
1299 .type = __constant_htons(ETH_P_IEEE802154),
1300 .func = lowpan_rcv,
1301};
1302
1303static int __init lowpan_init_module(void)
1304{
1305 int err = 0;
1306
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001307 err = lowpan_netlink_init();
1308 if (err < 0)
1309 goto out;
1310
1311 dev_add_pack(&lowpan_packet_type);
Alan Otta2dc375e2012-09-01 05:57:07 +00001312
1313 err = register_netdevice_notifier(&lowpan_dev_notifier);
1314 if (err < 0) {
1315 dev_remove_pack(&lowpan_packet_type);
1316 lowpan_netlink_fini();
1317 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001318out:
1319 return err;
1320}
1321
1322static void __exit lowpan_cleanup_module(void)
1323{
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001324 struct lowpan_fragment *frame, *tframe;
1325
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001326 lowpan_netlink_fini();
1327
1328 dev_remove_pack(&lowpan_packet_type);
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001329
Alan Otta2dc375e2012-09-01 05:57:07 +00001330 unregister_netdevice_notifier(&lowpan_dev_notifier);
1331
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001332 /* Now 6lowpan packet_type is removed, so no new fragments are
1333 * expected on RX, therefore that's the time to clean incomplete
1334 * fragments.
1335 */
1336 spin_lock_bh(&flist_lock);
1337 list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
1338 del_timer_sync(&frame->timer);
1339 list_del(&frame->list);
1340 dev_kfree_skb(frame->skb);
1341 kfree(frame);
1342 }
1343 spin_unlock_bh(&flist_lock);
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001344}
1345
1346module_init(lowpan_init_module);
1347module_exit(lowpan_cleanup_module);
1348MODULE_LICENSE("GPL");
1349MODULE_ALIAS_RTNL_LINK("lowpan");