blob: e1b4580f78dd66498f4f66902698d7c45654139b [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 */
Tony Cheneauababf382013-03-26 18:09:24 +0000107 unsigned short fragment_tag;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700108};
109
110struct lowpan_dev_record {
111 struct net_device *ldev;
112 struct list_head list;
113};
114
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000115struct lowpan_fragment {
116 struct sk_buff *skb; /* skb to be assembled */
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000117 u16 length; /* length to be assemled */
118 u32 bytes_rcv; /* bytes received */
119 u16 tag; /* current fragment tag */
120 struct timer_list timer; /* assembling timer */
121 struct list_head list; /* fragments list */
122};
123
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000124static 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;
Tony Cheneau24363b62013-03-25 17:59:32 +0000287
288 /* skip the UDP header */
289 skb_pull(skb, sizeof(struct udphdr));
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000290}
291
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000292static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700293{
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000294 if (unlikely(!pskb_may_pull(skb, 1)))
295 return -EINVAL;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700296
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000297 *val = skb->data[0];
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700298 skb_pull(skb, 1);
299
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000300 return 0;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700301}
302
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000303static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000304{
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000305 if (unlikely(!pskb_may_pull(skb, 2)))
306 return -EINVAL;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000307
Tony Cheneau45760392012-07-11 06:51:15 +0000308 *val = (skb->data[0] << 8) | skb->data[1];
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000309 skb_pull(skb, 2);
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000310
311 return 0;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000312}
313
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000314static int
Tony Cheneau24363b62013-03-25 17:59:32 +0000315lowpan_uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh)
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000316{
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000317 u8 tmp;
318
Tony Cheneaud4787a12012-07-11 06:51:14 +0000319 if (!uh)
320 goto err;
321
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000322 if (lowpan_fetch_skb_u8(skb, &tmp))
323 goto err;
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000324
325 if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000326 pr_debug("UDP header uncompression\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000327 switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
328 case LOWPAN_NHC_UDP_CS_P_00:
329 memcpy(&uh->source, &skb->data[0], 2);
330 memcpy(&uh->dest, &skb->data[2], 2);
331 skb_pull(skb, 4);
332 break;
333 case LOWPAN_NHC_UDP_CS_P_01:
334 memcpy(&uh->source, &skb->data[0], 2);
335 uh->dest =
336 skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
337 skb_pull(skb, 3);
338 break;
339 case LOWPAN_NHC_UDP_CS_P_10:
340 uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
341 memcpy(&uh->dest, &skb->data[1], 2);
342 skb_pull(skb, 3);
343 break;
344 case LOWPAN_NHC_UDP_CS_P_11:
345 uh->source =
346 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
347 uh->dest =
348 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
349 skb_pull(skb, 1);
350 break;
351 default:
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000352 pr_debug("ERROR: unknown UDP format\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000353 goto err;
354 break;
355 }
356
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000357 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
358 uh->source, uh->dest);
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000359
360 /* copy checksum */
361 memcpy(&uh->check, &skb->data[0], 2);
362 skb_pull(skb, 2);
Tony Cheneau24363b62013-03-25 17:59:32 +0000363
364 /*
365 * UDP lenght needs to be infered from the lower layers
366 * here, we obtain the hint from the remaining size of the
367 * frame
368 */
369 uh->len = htons(skb->len + sizeof(struct udphdr));
370 pr_debug("uncompressed UDP length: src = %d", uh->len);
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000371 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000372 pr_debug("ERROR: unsupported NH format\n");
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000373 goto err;
374 }
375
376 return 0;
377err:
378 return -EINVAL;
379}
380
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700381static int lowpan_header_create(struct sk_buff *skb,
382 struct net_device *dev,
383 unsigned short type, const void *_daddr,
Eric Dumazet95c96172012-04-15 05:58:06 +0000384 const void *_saddr, unsigned int len)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700385{
386 u8 tmp, iphc0, iphc1, *hc06_ptr;
387 struct ipv6hdr *hdr;
388 const u8 *saddr = _saddr;
389 const u8 *daddr = _daddr;
Alexander Aringfc4e98d2013-02-05 10:23:43 +0000390 u8 head[100];
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700391 struct ieee802154_addr sa, da;
392
Alexander Aringfc4e98d2013-02-05 10:23:43 +0000393 /* TODO:
394 * if this package isn't ipv6 one, where should it be routed?
395 */
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700396 if (type != ETH_P_IPV6)
397 return 0;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700398
399 hdr = ipv6_hdr(skb);
400 hc06_ptr = head + 2;
401
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000402 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
403 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
404 ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700405
406 lowpan_raw_dump_table(__func__, "raw skb network header dump",
407 skb_network_header(skb), sizeof(struct ipv6hdr));
408
409 if (!saddr)
410 saddr = dev->dev_addr;
411
412 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
413
414 /*
415 * As we copy some bit-length fields, in the IPHC encoding bytes,
416 * we sometimes use |=
417 * If the field is 0, and the current bit value in memory is 1,
418 * this does not work. We therefore reset the IPHC encoding here
419 */
420 iphc0 = LOWPAN_DISPATCH_IPHC;
421 iphc1 = 0;
422
423 /* TODO: context lookup */
424
425 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
426
427 /*
428 * Traffic class, flow label
429 * If flow label is 0, compress it. If traffic class is 0, compress it
430 * We have to process both in the same time as the offset of traffic
431 * class depends on the presence of version and flow label
432 */
433
434 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
435 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
436 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
437
438 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
439 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
440 /* flow label can be compressed */
441 iphc0 |= LOWPAN_IPHC_FL_C;
442 if ((hdr->priority == 0) &&
443 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
444 /* compress (elide) all */
445 iphc0 |= LOWPAN_IPHC_TC_C;
446 } else {
447 /* compress only the flow label */
448 *hc06_ptr = tmp;
449 hc06_ptr += 1;
450 }
451 } else {
452 /* Flow label cannot be compressed */
453 if ((hdr->priority == 0) &&
454 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
455 /* compress only traffic class */
456 iphc0 |= LOWPAN_IPHC_TC_C;
457 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
458 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
459 hc06_ptr += 3;
460 } else {
461 /* compress nothing */
462 memcpy(hc06_ptr, &hdr, 4);
463 /* replace the top byte with new ECN | DSCP format */
464 *hc06_ptr = tmp;
465 hc06_ptr += 4;
466 }
467 }
468
469 /* NOTE: payload length is always compressed */
470
471 /* Next Header is compress if UDP */
472 if (hdr->nexthdr == UIP_PROTO_UDP)
473 iphc0 |= LOWPAN_IPHC_NH_C;
474
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700475 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
476 *hc06_ptr = hdr->nexthdr;
477 hc06_ptr += 1;
478 }
479
480 /*
481 * Hop limit
482 * if 1: compress, encoding is 01
483 * if 64: compress, encoding is 10
484 * if 255: compress, encoding is 11
485 * else do not compress
486 */
487 switch (hdr->hop_limit) {
488 case 1:
489 iphc0 |= LOWPAN_IPHC_TTL_1;
490 break;
491 case 64:
492 iphc0 |= LOWPAN_IPHC_TTL_64;
493 break;
494 case 255:
495 iphc0 |= LOWPAN_IPHC_TTL_255;
496 break;
497 default:
498 *hc06_ptr = hdr->hop_limit;
alex.bluesman.smirnov@gmail.com5c00c0c2012-06-25 03:49:02 +0000499 hc06_ptr += 1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700500 break;
501 }
502
503 /* source address compression */
504 if (is_addr_unspecified(&hdr->saddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000505 pr_debug("source address is unspecified, setting SAC\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700506 iphc1 |= LOWPAN_IPHC_SAC;
507 /* TODO: context lookup */
508 } else if (is_addr_link_local(&hdr->saddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000509 pr_debug("source address is link-local\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700510 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
511 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
512 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000513 pr_debug("send the full source address\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700514 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
515 hc06_ptr += 16;
516 }
517
518 /* destination address compression */
519 if (is_addr_mcast(&hdr->daddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000520 pr_debug("destination address is multicast: ");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700521 iphc1 |= LOWPAN_IPHC_M;
522 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
523 pr_debug("compressed to 1 octet\n");
524 iphc1 |= LOWPAN_IPHC_DAM_11;
525 /* use last byte */
526 *hc06_ptr = hdr->daddr.s6_addr[15];
527 hc06_ptr += 1;
528 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
529 pr_debug("compressed to 4 octets\n");
530 iphc1 |= LOWPAN_IPHC_DAM_10;
531 /* second byte + the last three */
532 *hc06_ptr = hdr->daddr.s6_addr[1];
533 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
534 hc06_ptr += 4;
535 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
536 pr_debug("compressed to 6 octets\n");
537 iphc1 |= LOWPAN_IPHC_DAM_01;
538 /* second byte + the last five */
539 *hc06_ptr = hdr->daddr.s6_addr[1];
540 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
541 hc06_ptr += 6;
542 } else {
543 pr_debug("using full address\n");
544 iphc1 |= LOWPAN_IPHC_DAM_00;
545 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
546 hc06_ptr += 16;
547 }
548 } else {
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700549 /* TODO: context lookup */
550 if (is_addr_link_local(&hdr->daddr)) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000551 pr_debug("dest address is unicast and link-local\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700552 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
553 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
554 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000555 pr_debug("dest address is unicast: using full one\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700556 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
557 hc06_ptr += 16;
558 }
559 }
560
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000561 /* UDP header compression */
562 if (hdr->nexthdr == UIP_PROTO_UDP)
563 lowpan_compress_udp_header(&hc06_ptr, skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700564
565 head[0] = iphc0;
566 head[1] = iphc1;
567
568 skb_pull(skb, sizeof(struct ipv6hdr));
569 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
570
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700571 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
572 skb->len);
573
574 /*
575 * NOTE1: I'm still unsure about the fact that compression and WPAN
576 * header are created here and not later in the xmit. So wait for
577 * an opinion of net maintainers.
578 */
579 /*
580 * NOTE2: to be absolutely correct, we must derive PANid information
581 * from MAC subif of the 'dev' and 'real_dev' network devices, but
582 * this isn't implemented in mainline yet, so currently we assign 0xff
583 */
584 {
Tony Cheneau58ef67c2013-03-25 17:59:25 +0000585 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
Tony Cheneauc7d0ab22013-03-25 17:59:30 +0000586 mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
Tony Cheneau58ef67c2013-03-25 17:59:25 +0000587
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700588 /* prepare wpan address data */
589 sa.addr_type = IEEE802154_ADDR_LONG;
Tony Cheneau43de7aa2013-03-25 17:59:31 +0000590 sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700591
Tony Cheneau43de7aa2013-03-25 17:59:31 +0000592 memcpy(&(sa.hwaddr), saddr, 8);
593 /* intra-PAN communications */
594 da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
595
Tony Cheneau58ef67c2013-03-25 17:59:25 +0000596 /*
597 * if the destination address is the broadcast address, use the
598 * corresponding short address
599 */
600 if (lowpan_is_addr_broadcast(daddr)) {
601 da.addr_type = IEEE802154_ADDR_SHORT;
602 da.short_addr = IEEE802154_ADDR_BROADCAST;
603 } else {
604 da.addr_type = IEEE802154_ADDR_LONG;
Tony Cheneau6bdeaba2013-03-26 18:09:25 +0000605 memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000606
Tony Cheneau58ef67c2013-03-25 17:59:25 +0000607 /* request acknowledgment */
Tony Cheneauf333a152013-03-25 17:59:23 +0000608 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
Tony Cheneau58ef67c2013-03-25 17:59:25 +0000609 }
Tony Cheneauf333a152013-03-25 17:59:23 +0000610
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700611 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
612 type, (void *)&da, (void *)&sa, skb->len);
613 }
614}
615
Alan Ott0c446212013-01-16 19:09:47 +0000616static int lowpan_give_skb_to_devices(struct sk_buff *skb)
617{
618 struct lowpan_dev_record *entry;
619 struct sk_buff *skb_cp;
620 int stat = NET_RX_SUCCESS;
621
622 rcu_read_lock();
623 list_for_each_entry_rcu(entry, &lowpan_devices, list)
624 if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
625 skb_cp = skb_copy(skb, GFP_ATOMIC);
626 if (!skb_cp) {
627 stat = -ENOMEM;
628 break;
629 }
630
631 skb_cp->dev = entry->ldev;
632 stat = netif_rx(skb_cp);
633 }
634 rcu_read_unlock();
635
636 return stat;
637}
638
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700639static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
640{
641 struct sk_buff *new;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700642 int stat = NET_RX_SUCCESS;
643
644 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000645 GFP_ATOMIC);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700646 kfree_skb(skb);
647
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000648 if (!new)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700649 return -ENOMEM;
650
651 skb_push(new, sizeof(struct ipv6hdr));
652 skb_reset_network_header(new);
653 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
654
655 new->protocol = htons(ETH_P_IPV6);
656 new->pkt_type = PACKET_HOST;
657
Alan Ott0c446212013-01-16 19:09:47 +0000658 stat = lowpan_give_skb_to_devices(new);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700659
660 kfree_skb(new);
661
662 return stat;
663}
664
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000665static void lowpan_fragment_timer_expired(unsigned long entry_addr)
666{
667 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
668
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000669 pr_debug("timer expired for frame with tag %d\n", entry->tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000670
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000671 list_del(&entry->list);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000672 dev_kfree_skb(entry->skb);
673 kfree(entry);
674}
675
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000676static struct lowpan_fragment *
Tony Cheneaud991b982013-03-25 17:59:26 +0000677lowpan_alloc_new_frame(struct sk_buff *skb, u16 len, u16 tag)
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000678{
679 struct lowpan_fragment *frame;
680
681 frame = kzalloc(sizeof(struct lowpan_fragment),
682 GFP_ATOMIC);
683 if (!frame)
684 goto frame_err;
685
686 INIT_LIST_HEAD(&frame->list);
687
Tony Cheneau5e968552012-07-11 06:51:16 +0000688 frame->length = len;
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000689 frame->tag = tag;
690
691 /* allocate buffer for frame assembling */
alex.bluesman.smirnov@gmail.com79ff1db2012-07-10 21:22:45 +0000692 frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length +
693 sizeof(struct ipv6hdr));
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000694
695 if (!frame->skb)
696 goto skb_err;
697
698 frame->skb->priority = skb->priority;
699 frame->skb->dev = skb->dev;
700
701 /* reserve headroom for uncompressed ipv6 header */
702 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
703 skb_put(frame->skb, frame->length);
704
705 init_timer(&frame->timer);
706 /* time out is the same as for ipv6 - 60 sec */
707 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
708 frame->timer.data = (unsigned long)frame;
709 frame->timer.function = lowpan_fragment_timer_expired;
710
711 add_timer(&frame->timer);
712
713 list_add_tail(&frame->list, &lowpan_fragments);
714
715 return frame;
716
717skb_err:
718 kfree(frame);
719frame_err:
720 return NULL;
721}
722
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700723static int
724lowpan_process_data(struct sk_buff *skb)
725{
726 struct ipv6hdr hdr;
727 u8 tmp, iphc0, iphc1, num_context = 0;
728 u8 *_saddr, *_daddr;
729 int err;
730
731 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
732 skb->len);
733 /* at least two bytes will be used for the encoding */
734 if (skb->len < 2)
735 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000736
737 if (lowpan_fetch_skb_u8(skb, &iphc0))
738 goto drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000739
740 /* fragments assembling */
741 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
742 case LOWPAN_DISPATCH_FRAG1:
743 case LOWPAN_DISPATCH_FRAGN:
744 {
745 struct lowpan_fragment *frame;
Tony Cheneau5e968552012-07-11 06:51:16 +0000746 /* slen stores the rightmost 8 bits of the 11 bits length */
Tony Cheneaud991b982013-03-25 17:59:26 +0000747 u8 slen, offset = 0;
Tony Cheneau5e968552012-07-11 06:51:16 +0000748 u16 len, tag;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000749 bool found = false;
750
Tony Cheneau5e968552012-07-11 06:51:16 +0000751 if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000752 lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
753 goto drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000754
Tony Cheneau5e968552012-07-11 06:51:16 +0000755 /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
756 len = ((iphc0 & 7) << 8) | slen;
757
Tony Cheneau9da29242013-03-25 17:59:27 +0000758 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) {
759 pr_debug("%s received a FRAG1 packet (tag: %d, "
760 "size of the entire IP packet: %d)",
761 __func__, tag, len);
762 } else { /* FRAGN */
Tony Cheneaud991b982013-03-25 17:59:26 +0000763 if (lowpan_fetch_skb_u8(skb, &offset))
764 goto unlock_and_drop;
Tony Cheneau9da29242013-03-25 17:59:27 +0000765 pr_debug("%s received a FRAGN packet (tag: %d, "
766 "size of the entire IP packet: %d, "
767 "offset: %d)", __func__, tag, len, offset * 8);
Tony Cheneaud991b982013-03-25 17:59:26 +0000768 }
769
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000770 /*
771 * check if frame assembling with the same tag is
772 * already in progress
773 */
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000774 spin_lock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000775
776 list_for_each_entry(frame, &lowpan_fragments, list)
777 if (frame->tag == tag) {
778 found = true;
779 break;
780 }
781
782 /* alloc new frame structure */
783 if (!found) {
Tony Cheneau9da29242013-03-25 17:59:27 +0000784 pr_debug("%s first fragment received for tag %d, "
785 "begin packet reassembly", __func__, tag);
Tony Cheneau5e968552012-07-11 06:51:16 +0000786 frame = lowpan_alloc_new_frame(skb, len, tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000787 if (!frame)
788 goto unlock_and_drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000789 }
790
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000791 /* if payload fits buffer, copy it */
792 if (likely((offset * 8 + skb->len) <= frame->length))
793 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
794 skb->data, skb->len);
795 else
796 goto unlock_and_drop;
797
798 frame->bytes_rcv += skb->len;
799
800 /* frame assembling complete */
801 if ((frame->bytes_rcv == frame->length) &&
802 frame->timer.expires > jiffies) {
803 /* if timer haven't expired - first of all delete it */
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000804 del_timer_sync(&frame->timer);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000805 list_del(&frame->list);
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000806 spin_unlock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000807
Tony Cheneau9da29242013-03-25 17:59:27 +0000808 pr_debug("%s successfully reassembled fragment "
809 "(tag %d)", __func__, tag);
810
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000811 dev_kfree_skb(skb);
812 skb = frame->skb;
813 kfree(frame);
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000814
815 if (lowpan_fetch_skb_u8(skb, &iphc0))
Dan Carpenter747cf6e2012-06-26 20:53:09 +0000816 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000817
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000818 break;
819 }
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +0000820 spin_unlock_bh(&flist_lock);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000821
822 return kfree_skb(skb), 0;
823 }
824 default:
825 break;
826 }
827
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000828 if (lowpan_fetch_skb_u8(skb, &iphc1))
829 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700830
831 _saddr = mac_cb(skb)->sa.hwaddr;
832 _daddr = mac_cb(skb)->da.hwaddr;
833
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000834 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700835
836 /* another if the CID flag is set */
837 if (iphc1 & LOWPAN_IPHC_CID) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000838 pr_debug("CID flag is set, increase header with one\n");
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000839 if (lowpan_fetch_skb_u8(skb, &num_context))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700840 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700841 }
842
843 hdr.version = 6;
844
845 /* Traffic Class and Flow Label */
846 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
847 /*
848 * Traffic Class and FLow Label carried in-line
849 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
850 */
851 case 0: /* 00b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000852 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700853 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000854
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700855 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
856 skb_pull(skb, 3);
857 hdr.priority = ((tmp >> 2) & 0x0f);
858 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
859 (hdr.flow_lbl[0] & 0x0f);
860 break;
861 /*
862 * Traffic class carried in-line
863 * ECN + DSCP (1 byte), Flow Label is elided
864 */
865 case 1: /* 10b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000866 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700867 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000868
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700869 hdr.priority = ((tmp >> 2) & 0x0f);
870 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
871 hdr.flow_lbl[1] = 0;
872 hdr.flow_lbl[2] = 0;
873 break;
874 /*
875 * Flow Label carried in-line
876 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
877 */
878 case 2: /* 01b */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000879 if (lowpan_fetch_skb_u8(skb, &tmp))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700880 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000881
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700882 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
883 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
884 skb_pull(skb, 2);
885 break;
886 /* Traffic Class and Flow Label are elided */
887 case 3: /* 11b */
888 hdr.priority = 0;
889 hdr.flow_lbl[0] = 0;
890 hdr.flow_lbl[1] = 0;
891 hdr.flow_lbl[2] = 0;
892 break;
893 default:
894 break;
895 }
896
897 /* Next Header */
898 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
899 /* Next header is carried inline */
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000900 if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700901 goto drop;
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000902
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000903 pr_debug("NH flag is set, next header carried inline: %02x\n",
904 hdr.nexthdr);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700905 }
906
907 /* Hop Limit */
908 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
909 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
910 else {
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000911 if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700912 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700913 }
914
915 /* Extract SAM to the tmp variable */
916 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
917
918 /* Source address uncompression */
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000919 pr_debug("source address stateless compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700920 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
921 lowpan_unc_llconf[tmp], skb->data);
922 if (err)
923 goto drop;
924
925 /* Extract DAM to the tmp variable */
926 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
927
928 /* check for Multicast Compression */
929 if (iphc1 & LOWPAN_IPHC_M) {
930 if (iphc1 & LOWPAN_IPHC_DAC) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000931 pr_debug("dest: context-based mcast compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700932 /* TODO: implement this */
933 } else {
934 u8 prefix[] = {0xff, 0x02};
935
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000936 pr_debug("dest: non context-based mcast compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700937 if (0 < tmp && tmp < 3) {
alex.bluesman.smirnov@gmail.comc5d36872012-06-25 03:49:01 +0000938 if (lowpan_fetch_skb_u8(skb, &prefix[1]))
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700939 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700940 }
941
942 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
943 lowpan_unc_mxconf[tmp], NULL);
944 if (err)
945 goto drop;
946 }
947 } else {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000948 pr_debug("dest: stateless compression\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700949 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
950 lowpan_unc_llconf[tmp], skb->data);
951 if (err)
952 goto drop;
953 }
954
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000955 /* UDP data uncompression */
Tony Cheneauf5c20f52013-03-25 17:59:22 +0000956 if (iphc0 & LOWPAN_IPHC_NH_C) {
Tony Cheneau24363b62013-03-25 17:59:32 +0000957 struct udphdr uh;
958 struct sk_buff *new;
959 if (lowpan_uncompress_udp_header(skb, &uh))
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000960 goto drop;
Tony Cheneau24363b62013-03-25 17:59:32 +0000961
962 /*
963 * replace the compressed UDP head by the uncompressed UDP
964 * header
965 */
966 new = skb_copy_expand(skb, sizeof(struct udphdr),
967 skb_tailroom(skb), GFP_ATOMIC);
968 kfree_skb(skb);
969
970 if (!new)
971 return -ENOMEM;
972
973 skb = new;
974
975 skb_push(skb, sizeof(struct udphdr));
976 skb_reset_transport_header(skb);
977 skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr));
978
979 lowpan_raw_dump_table(__func__, "raw UDP header dump",
980 (u8 *)&uh, sizeof(uh));
981
Tony Cheneauf5c20f52013-03-25 17:59:22 +0000982 hdr.nexthdr = UIP_PROTO_UDP;
983 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700984
985 /* Not fragmented package */
986 hdr.payload_len = htons(skb->len);
987
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000988 pr_debug("skb headroom size = %d, data length = %d\n",
989 skb_headroom(skb), skb->len);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700990
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +0000991 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
992 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700993 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
994
995 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
996 sizeof(hdr));
997 return lowpan_skb_deliver(skb, &hdr);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000998
999unlock_and_drop:
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001000 spin_unlock_bh(&flist_lock);
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001001drop:
Dan Carpenter90d09632011-08-30 03:45:52 +00001002 kfree_skb(skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001003 return -EINVAL;
1004}
1005
alex.bluesman.smirnov@gmail.com42c36292012-07-01 19:58:46 +00001006static int lowpan_set_address(struct net_device *dev, void *p)
1007{
1008 struct sockaddr *sa = p;
1009
1010 if (netif_running(dev))
1011 return -EBUSY;
1012
1013 /* TODO: validate addr */
1014 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1015
1016 return 0;
1017}
1018
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001019static int lowpan_get_mac_header_length(struct sk_buff *skb)
1020{
1021 /*
1022 * Currently long addressing mode is supported only, so the overall
1023 * header size is 21:
1024 * FC SeqNum DPAN DA SA Sec
1025 * 2 + 1 + 2 + 8 + 8 + 0 = 21
1026 */
1027 return 21;
1028}
1029
1030static int
1031lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
Tony Cheneaud991b982013-03-25 17:59:26 +00001032 int mlen, int plen, int offset, int type)
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001033{
1034 struct sk_buff *frag;
1035 int hlen, ret;
1036
Tony Cheneaud991b982013-03-25 17:59:26 +00001037 hlen = (type == LOWPAN_DISPATCH_FRAG1) ?
1038 LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001039
1040 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
1041
1042 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
1043 if (!frag)
1044 return -ENOMEM;
1045
1046 frag->priority = skb->priority;
1047 frag->dev = skb->dev;
1048
1049 /* copy header, MFR and payload */
1050 memcpy(skb_put(frag, mlen), skb->data, mlen);
1051 memcpy(skb_put(frag, hlen), head, hlen);
1052
1053 if (plen)
1054 skb_copy_from_linear_data_offset(skb, offset + mlen,
1055 skb_put(frag, plen), plen);
1056
1057 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
1058 frag->len);
1059
1060 ret = dev_queue_xmit(frag);
1061
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001062 return ret;
1063}
1064
1065static int
Tony Cheneaud4ac3232013-03-25 17:59:28 +00001066lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev)
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001067{
1068 int err, header_length, payload_length, tag, offset = 0;
1069 u8 head[5];
1070
1071 header_length = lowpan_get_mac_header_length(skb);
1072 payload_length = skb->len - header_length;
Tony Cheneaud4ac3232013-03-25 17:59:28 +00001073 tag = lowpan_dev_info(dev)->fragment_tag++;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001074
1075 /* first fragment header */
Tony Cheneau5e968552012-07-11 06:51:16 +00001076 head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7);
1077 head[1] = payload_length & 0xff;
Tony Cheneau45760392012-07-11 06:51:15 +00001078 head[2] = tag >> 8;
1079 head[3] = tag & 0xff;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001080
Tony Cheneaud991b982013-03-25 17:59:26 +00001081 err = lowpan_fragment_xmit(skb, head, header_length, LOWPAN_FRAG_SIZE,
1082 0, LOWPAN_DISPATCH_FRAG1);
1083
Tony Cheneau9da29242013-03-25 17:59:27 +00001084 if (err) {
1085 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
1086 __func__, tag);
Tony Cheneaud991b982013-03-25 17:59:26 +00001087 goto exit;
Tony Cheneau9da29242013-03-25 17:59:27 +00001088 }
Tony Cheneaud991b982013-03-25 17:59:26 +00001089
1090 offset = LOWPAN_FRAG_SIZE;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001091
1092 /* next fragment header */
1093 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1094 head[0] |= LOWPAN_DISPATCH_FRAGN;
1095
1096 while ((payload_length - offset > 0) && (err >= 0)) {
1097 int len = LOWPAN_FRAG_SIZE;
1098
1099 head[4] = offset / 8;
1100
1101 if (payload_length - offset < len)
1102 len = payload_length - offset;
1103
1104 err = lowpan_fragment_xmit(skb, head, header_length,
Tony Cheneaud991b982013-03-25 17:59:26 +00001105 len, offset, LOWPAN_DISPATCH_FRAGN);
Tony Cheneau9da29242013-03-25 17:59:27 +00001106 if (err) {
1107 pr_debug("%s unable to send a subsequent FRAGN packet "
1108 "(tag: %d, offset: %d", __func__, tag, offset);
Tony Cheneaud991b982013-03-25 17:59:26 +00001109 goto exit;
Tony Cheneau9da29242013-03-25 17:59:27 +00001110 }
Tony Cheneaud991b982013-03-25 17:59:26 +00001111
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001112 offset += len;
1113 }
1114
Tony Cheneaud991b982013-03-25 17:59:26 +00001115exit:
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001116 return err;
1117}
1118
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001119static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1120{
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001121 int err = -1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001122
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001123 pr_debug("package xmit\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001124
1125 skb->dev = lowpan_dev_info(dev)->real_dev;
1126 if (skb->dev == NULL) {
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001127 pr_debug("ERROR: no real wpan device found\n");
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001128 goto error;
1129 }
1130
Alan Ottb333b7e2012-11-29 15:55:44 +00001131 /* Send directly if less than the MTU minus the 2 checksum bytes. */
1132 if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001133 err = dev_queue_xmit(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001134 goto out;
1135 }
1136
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001137 pr_debug("frame is too big, fragmentation is needed\n");
Tony Cheneaud4ac3232013-03-25 17:59:28 +00001138 err = lowpan_skb_fragmentation(skb, dev);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001139error:
1140 dev_kfree_skb(skb);
1141out:
1142 if (err < 0)
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001143 pr_debug("ERROR: xmit failed\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001144
1145 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
1146}
1147
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001148static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
1149{
1150 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1151 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
1152}
1153
1154static u16 lowpan_get_pan_id(const struct net_device *dev)
1155{
1156 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1157 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
1158}
1159
1160static u16 lowpan_get_short_addr(const struct net_device *dev)
1161{
1162 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1163 return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
1164}
1165
Tony Cheneauc7d0ab22013-03-25 17:59:30 +00001166static u8 lowpan_get_dsn(const struct net_device *dev)
1167{
1168 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1169 return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
1170}
1171
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001172static struct header_ops lowpan_header_ops = {
1173 .create = lowpan_header_create,
1174};
1175
1176static const struct net_device_ops lowpan_netdev_ops = {
1177 .ndo_start_xmit = lowpan_xmit,
alex.bluesman.smirnov@gmail.com42c36292012-07-01 19:58:46 +00001178 .ndo_set_mac_address = lowpan_set_address,
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001179};
1180
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001181static struct ieee802154_mlme_ops lowpan_mlme = {
1182 .get_pan_id = lowpan_get_pan_id,
1183 .get_phy = lowpan_get_phy,
1184 .get_short_addr = lowpan_get_short_addr,
Tony Cheneauc7d0ab22013-03-25 17:59:30 +00001185 .get_dsn = lowpan_get_dsn,
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001186};
1187
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001188static void lowpan_setup(struct net_device *dev)
1189{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001190 dev->addr_len = IEEE802154_ADDR_LEN;
1191 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1192 dev->type = ARPHRD_IEEE802154;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001193 /* Frame Control + Sequence Number + Address fields + Security Header */
1194 dev->hard_header_len = 2 + 1 + 20 + 14;
1195 dev->needed_tailroom = 2; /* FCS */
1196 dev->mtu = 1281;
1197 dev->tx_queue_len = 0;
alex.bluesman.smirnov@gmail.com4d039f62011-11-10 07:39:37 +00001198 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001199 dev->watchdog_timeo = 0;
1200
1201 dev->netdev_ops = &lowpan_netdev_ops;
1202 dev->header_ops = &lowpan_header_ops;
alex.bluesman.smirnov@gmail.com0848e402012-04-25 23:24:56 +00001203 dev->ml_priv = &lowpan_mlme;
Alan Otta2dc375e2012-09-01 05:57:07 +00001204 dev->destructor = free_netdev;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001205}
1206
1207static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1208{
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001209 if (tb[IFLA_ADDRESS]) {
1210 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1211 return -EINVAL;
1212 }
1213 return 0;
1214}
1215
1216static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1217 struct packet_type *pt, struct net_device *orig_dev)
1218{
Alan Otta437d272012-09-01 05:57:06 +00001219 struct sk_buff *local_skb;
1220
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001221 if (!netif_running(dev))
1222 goto drop;
1223
1224 if (dev->type != ARPHRD_IEEE802154)
1225 goto drop;
1226
1227 /* check that it's our buffer */
Alan Ottee21c7e2013-01-16 19:09:48 +00001228 if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
1229 /* Copy the packet so that the IPv6 header is
1230 * properly aligned.
1231 */
1232 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
1233 skb_tailroom(skb), GFP_ATOMIC);
Alan Otta437d272012-09-01 05:57:06 +00001234 if (!local_skb)
1235 goto drop;
Alan Otta437d272012-09-01 05:57:06 +00001236
Alan Ottee21c7e2013-01-16 19:09:48 +00001237 local_skb->protocol = htons(ETH_P_IPV6);
1238 local_skb->pkt_type = PACKET_HOST;
1239
1240 /* Pull off the 1-byte of 6lowpan header. */
1241 skb_pull(local_skb, 1);
1242 skb_reset_network_header(local_skb);
1243 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
1244
1245 lowpan_give_skb_to_devices(local_skb);
1246
1247 kfree_skb(local_skb);
Alan Otta437d272012-09-01 05:57:06 +00001248 kfree_skb(skb);
Alan Ottee21c7e2013-01-16 19:09:48 +00001249 } else {
1250 switch (skb->data[0] & 0xe0) {
1251 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1252 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1253 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
1254 local_skb = skb_clone(skb, GFP_ATOMIC);
1255 if (!local_skb)
1256 goto drop;
1257 lowpan_process_data(local_skb);
1258
1259 kfree_skb(skb);
1260 break;
1261 default:
1262 break;
1263 }
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001264 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001265
1266 return NET_RX_SUCCESS;
1267
1268drop:
1269 kfree_skb(skb);
1270 return NET_RX_DROP;
1271}
1272
1273static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1274 struct nlattr *tb[], struct nlattr *data[])
1275{
1276 struct net_device *real_dev;
1277 struct lowpan_dev_record *entry;
1278
alex.bluesman.smirnov@gmail.come71094f2012-06-25 03:49:03 +00001279 pr_debug("adding new link\n");
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001280
1281 if (!tb[IFLA_LINK])
1282 return -EINVAL;
1283 /* find and hold real wpan device */
1284 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1285 if (!real_dev)
1286 return -ENODEV;
1287
1288 lowpan_dev_info(dev)->real_dev = real_dev;
Tony Cheneaud4ac3232013-03-25 17:59:28 +00001289 lowpan_dev_info(dev)->fragment_tag = 0;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001290 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1291
1292 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001293 if (!entry) {
1294 dev_put(real_dev);
1295 lowpan_dev_info(dev)->real_dev = NULL;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001296 return -ENOMEM;
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001297 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001298
1299 entry->ldev = dev;
1300
1301 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1302 INIT_LIST_HEAD(&entry->list);
1303 list_add_tail(&entry->list, &lowpan_devices);
1304 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1305
1306 register_netdevice(dev);
1307
1308 return 0;
1309}
1310
1311static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1312{
1313 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1314 struct net_device *real_dev = lowpan_dev->real_dev;
alex.bluesman.smirnov@gmail.com8deff4a2012-04-25 23:24:57 +00001315 struct lowpan_dev_record *entry, *tmp;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001316
1317 ASSERT_RTNL();
1318
1319 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
Dan Carpenteraec9db32011-08-30 03:46:40 +00001320 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001321 if (entry->ldev == dev) {
1322 list_del(&entry->list);
1323 kfree(entry);
1324 }
Dan Carpenteraec9db32011-08-30 03:46:40 +00001325 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001326 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1327
1328 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1329
1330 unregister_netdevice_queue(dev, head);
1331
1332 dev_put(real_dev);
1333}
1334
1335static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1336 .kind = "lowpan",
1337 .priv_size = sizeof(struct lowpan_dev_info),
1338 .setup = lowpan_setup,
1339 .newlink = lowpan_newlink,
1340 .dellink = lowpan_dellink,
1341 .validate = lowpan_validate,
1342};
1343
1344static inline int __init lowpan_netlink_init(void)
1345{
1346 return rtnl_link_register(&lowpan_link_ops);
1347}
1348
David S. Millera07fdce2013-02-06 15:54:38 -05001349static inline void lowpan_netlink_fini(void)
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001350{
1351 rtnl_link_unregister(&lowpan_link_ops);
1352}
1353
Alan Otta2dc375e2012-09-01 05:57:07 +00001354static int lowpan_device_event(struct notifier_block *unused,
1355 unsigned long event,
1356 void *ptr)
1357{
1358 struct net_device *dev = ptr;
1359 LIST_HEAD(del_list);
1360 struct lowpan_dev_record *entry, *tmp;
1361
1362 if (dev->type != ARPHRD_IEEE802154)
1363 goto out;
1364
1365 if (event == NETDEV_UNREGISTER) {
1366 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1367 if (lowpan_dev_info(entry->ldev)->real_dev == dev)
1368 lowpan_dellink(entry->ldev, &del_list);
1369 }
1370
1371 unregister_netdevice_many(&del_list);
Peter Senna Tschudin4c835012012-09-18 07:10:43 +00001372 }
Alan Otta2dc375e2012-09-01 05:57:07 +00001373
1374out:
1375 return NOTIFY_DONE;
1376}
1377
1378static struct notifier_block lowpan_dev_notifier = {
1379 .notifier_call = lowpan_device_event,
1380};
1381
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001382static struct packet_type lowpan_packet_type = {
1383 .type = __constant_htons(ETH_P_IEEE802154),
1384 .func = lowpan_rcv,
1385};
1386
1387static int __init lowpan_init_module(void)
1388{
1389 int err = 0;
1390
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001391 err = lowpan_netlink_init();
1392 if (err < 0)
1393 goto out;
1394
1395 dev_add_pack(&lowpan_packet_type);
Alan Otta2dc375e2012-09-01 05:57:07 +00001396
1397 err = register_netdevice_notifier(&lowpan_dev_notifier);
1398 if (err < 0) {
1399 dev_remove_pack(&lowpan_packet_type);
1400 lowpan_netlink_fini();
1401 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001402out:
1403 return err;
1404}
1405
1406static void __exit lowpan_cleanup_module(void)
1407{
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001408 struct lowpan_fragment *frame, *tframe;
1409
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001410 lowpan_netlink_fini();
1411
1412 dev_remove_pack(&lowpan_packet_type);
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001413
Alan Otta2dc375e2012-09-01 05:57:07 +00001414 unregister_netdevice_notifier(&lowpan_dev_notifier);
1415
alex.bluesman.smirnov@gmail.com33c34c52012-07-10 21:22:48 +00001416 /* Now 6lowpan packet_type is removed, so no new fragments are
1417 * expected on RX, therefore that's the time to clean incomplete
1418 * fragments.
1419 */
1420 spin_lock_bh(&flist_lock);
1421 list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
1422 del_timer_sync(&frame->timer);
1423 list_del(&frame->list);
1424 dev_kfree_skb(frame->skb);
1425 kfree(frame);
1426 }
1427 spin_unlock_bh(&flist_lock);
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001428}
1429
1430module_init(lowpan_init_module);
1431module_exit(lowpan_cleanup_module);
1432MODULE_LICENSE("GPL");
1433MODULE_ALIAS_RTNL_LINK("lowpan");