2 * Copyright 2011, Siemens AG
3 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
7 * Based on patches from Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
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.
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.
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.
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.
28 * Redistribution and use in source and binary forms, with or without
29 * modification, are permitted provided that the following conditions
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.
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
53 #include <linux/bitops.h>
54 #include <linux/if_arp.h>
55 #include <linux/module.h>
56 #include <linux/moduleparam.h>
57 #include <linux/netdevice.h>
58 #include <net/af_ieee802154.h>
59 #include <net/ieee802154.h>
60 #include <net/ieee802154_netdev.h>
65 /* TTL uncompression values */
66 static const u8 lowpan_ttl_values
[] = {0, 1, 64, 255};
68 static LIST_HEAD(lowpan_devices
);
70 /* private device info */
71 struct lowpan_dev_info
{
72 struct net_device
*real_dev
; /* real WPAN device ptr */
73 struct mutex dev_list_mtx
; /* mutex for list ops */
74 unsigned short fragment_tag
;
77 struct lowpan_dev_record
{
78 struct net_device
*ldev
;
79 struct list_head list
;
82 struct lowpan_fragment
{
83 struct sk_buff
*skb
; /* skb to be assembled */
84 u16 length
; /* length to be assemled */
85 u32 bytes_rcv
; /* bytes received */
86 u16 tag
; /* current fragment tag */
87 struct timer_list timer
; /* assembling timer */
88 struct list_head list
; /* fragments list */
91 static LIST_HEAD(lowpan_fragments
);
92 static DEFINE_SPINLOCK(flist_lock
);
95 lowpan_dev_info
*lowpan_dev_info(const struct net_device
*dev
)
97 return netdev_priv(dev
);
100 static inline void lowpan_address_flip(u8
*src
, u8
*dest
)
103 for (i
= 0; i
< IEEE802154_ADDR_LEN
; i
++)
104 (dest
)[IEEE802154_ADDR_LEN
- i
- 1] = (src
)[i
];
107 /* list of all 6lowpan devices, uses for package delivering */
108 /* print data in line */
109 static inline void lowpan_raw_dump_inline(const char *caller
, char *msg
,
110 unsigned char *buf
, int len
)
114 pr_debug("(%s) %s: ", caller
, msg
);
115 print_hex_dump(KERN_DEBUG
, "", DUMP_PREFIX_NONE
,
116 16, 1, buf
, len
, false);
121 * print data in a table format:
123 * addr: xx xx xx xx xx xx
124 * addr: xx xx xx xx xx xx
127 static inline void lowpan_raw_dump_table(const char *caller
, char *msg
,
128 unsigned char *buf
, int len
)
132 pr_debug("(%s) %s:\n", caller
, msg
);
133 print_hex_dump(KERN_DEBUG
, "\t", DUMP_PREFIX_OFFSET
,
134 16, 1, buf
, len
, false);
139 lowpan_compress_addr_64(u8
**hc06_ptr
, u8 shift
, const struct in6_addr
*ipaddr
,
140 const unsigned char *lladdr
)
144 if (is_addr_mac_addr_based(ipaddr
, lladdr
))
145 val
= 3; /* 0-bits */
146 else if (lowpan_is_iid_16_bit_compressable(ipaddr
)) {
147 /* compress IID to 16 bits xxxx::XXXX */
148 memcpy(*hc06_ptr
, &ipaddr
->s6_addr16
[7], 2);
150 val
= 2; /* 16-bits */
152 /* do not compress IID => xxxx::IID */
153 memcpy(*hc06_ptr
, &ipaddr
->s6_addr16
[4], 8);
155 val
= 1; /* 64-bits */
158 return rol8(val
, shift
);
162 * Uncompress address function for source and
163 * destination address(non-multicast).
165 * address_mode is sam value or dam value.
168 lowpan_uncompress_addr(struct sk_buff
*skb
,
169 struct in6_addr
*ipaddr
,
170 const u8 address_mode
,
171 const struct ieee802154_addr
*lladdr
)
175 switch (address_mode
) {
176 case LOWPAN_IPHC_ADDR_00
:
177 /* for global link addresses */
178 fail
= lowpan_fetch_skb(skb
, ipaddr
->s6_addr
, 16);
180 case LOWPAN_IPHC_ADDR_01
:
181 /* fe:80::XXXX:XXXX:XXXX:XXXX */
182 ipaddr
->s6_addr
[0] = 0xFE;
183 ipaddr
->s6_addr
[1] = 0x80;
184 fail
= lowpan_fetch_skb(skb
, &ipaddr
->s6_addr
[8], 8);
186 case LOWPAN_IPHC_ADDR_02
:
187 /* fe:80::ff:fe00:XXXX */
188 ipaddr
->s6_addr
[0] = 0xFE;
189 ipaddr
->s6_addr
[1] = 0x80;
190 ipaddr
->s6_addr
[11] = 0xFF;
191 ipaddr
->s6_addr
[12] = 0xFE;
192 fail
= lowpan_fetch_skb(skb
, &ipaddr
->s6_addr
[14], 2);
194 case LOWPAN_IPHC_ADDR_03
:
196 switch (lladdr
->addr_type
) {
197 case IEEE802154_ADDR_LONG
:
198 /* fe:80::XXXX:XXXX:XXXX:XXXX
199 * \_________________/
202 ipaddr
->s6_addr
[0] = 0xFE;
203 ipaddr
->s6_addr
[1] = 0x80;
204 memcpy(&ipaddr
->s6_addr
[8], lladdr
->hwaddr
,
205 IEEE802154_ADDR_LEN
);
206 /* second bit-flip (Universe/Local)
207 * is done according RFC2464
209 ipaddr
->s6_addr
[8] ^= 0x02;
211 case IEEE802154_ADDR_SHORT
:
212 /* fe:80::ff:fe00:XXXX
216 * Universe/Local bit is zero.
218 ipaddr
->s6_addr
[0] = 0xFE;
219 ipaddr
->s6_addr
[1] = 0x80;
220 ipaddr
->s6_addr
[11] = 0xFF;
221 ipaddr
->s6_addr
[12] = 0xFE;
222 ipaddr
->s6_addr16
[7] = htons(lladdr
->short_addr
);
225 pr_debug("Invalid addr_type set\n");
230 pr_debug("Invalid address mode value: 0x%x\n", address_mode
);
235 pr_debug("Failed to fetch skb data\n");
239 lowpan_raw_dump_inline(NULL
, "Reconstructed ipv6 addr is:\n",
240 ipaddr
->s6_addr
, 16);
245 /* Uncompress function for multicast destination address,
249 lowpan_uncompress_multicast_daddr(struct sk_buff
*skb
,
250 struct in6_addr
*ipaddr
,
256 case LOWPAN_IPHC_DAM_00
:
257 /* 00: 128 bits. The full address
258 * is carried in-line.
260 fail
= lowpan_fetch_skb(skb
, ipaddr
->s6_addr
, 16);
262 case LOWPAN_IPHC_DAM_01
:
263 /* 01: 48 bits. The address takes
264 * the form ffXX::00XX:XXXX:XXXX.
266 ipaddr
->s6_addr
[0] = 0xFF;
267 fail
= lowpan_fetch_skb(skb
, &ipaddr
->s6_addr
[1], 1);
268 fail
|= lowpan_fetch_skb(skb
, &ipaddr
->s6_addr
[11], 5);
270 case LOWPAN_IPHC_DAM_10
:
271 /* 10: 32 bits. The address takes
272 * the form ffXX::00XX:XXXX.
274 ipaddr
->s6_addr
[0] = 0xFF;
275 fail
= lowpan_fetch_skb(skb
, &ipaddr
->s6_addr
[1], 1);
276 fail
|= lowpan_fetch_skb(skb
, &ipaddr
->s6_addr
[13], 3);
278 case LOWPAN_IPHC_DAM_11
:
279 /* 11: 8 bits. The address takes
280 * the form ff02::00XX.
282 ipaddr
->s6_addr
[0] = 0xFF;
283 ipaddr
->s6_addr
[1] = 0x02;
284 fail
= lowpan_fetch_skb(skb
, &ipaddr
->s6_addr
[15], 1);
287 pr_debug("DAM value has a wrong value: 0x%x\n", dam
);
292 pr_debug("Failed to fetch skb data\n");
296 lowpan_raw_dump_inline(NULL
, "Reconstructed ipv6 multicast addr is:\n",
297 ipaddr
->s6_addr
, 16);
303 lowpan_compress_udp_header(u8
**hc06_ptr
, struct sk_buff
*skb
)
305 struct udphdr
*uh
= udp_hdr(skb
);
307 if (((uh
->source
& LOWPAN_NHC_UDP_4BIT_MASK
) ==
308 LOWPAN_NHC_UDP_4BIT_PORT
) &&
309 ((uh
->dest
& LOWPAN_NHC_UDP_4BIT_MASK
) ==
310 LOWPAN_NHC_UDP_4BIT_PORT
)) {
311 pr_debug("UDP header: both ports compression to 4 bits\n");
312 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_11
;
313 **(hc06_ptr
+ 1) = /* subtraction is faster */
314 (u8
)((uh
->dest
- LOWPAN_NHC_UDP_4BIT_PORT
) +
315 ((uh
->source
& LOWPAN_NHC_UDP_4BIT_PORT
) << 4));
317 } else if ((uh
->dest
& LOWPAN_NHC_UDP_8BIT_MASK
) ==
318 LOWPAN_NHC_UDP_8BIT_PORT
) {
319 pr_debug("UDP header: remove 8 bits of dest\n");
320 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_01
;
321 memcpy(*hc06_ptr
+ 1, &uh
->source
, 2);
322 **(hc06_ptr
+ 3) = (u8
)(uh
->dest
- LOWPAN_NHC_UDP_8BIT_PORT
);
324 } else if ((uh
->source
& LOWPAN_NHC_UDP_8BIT_MASK
) ==
325 LOWPAN_NHC_UDP_8BIT_PORT
) {
326 pr_debug("UDP header: remove 8 bits of source\n");
327 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_10
;
328 memcpy(*hc06_ptr
+ 1, &uh
->dest
, 2);
329 **(hc06_ptr
+ 3) = (u8
)(uh
->source
- LOWPAN_NHC_UDP_8BIT_PORT
);
332 pr_debug("UDP header: can't compress\n");
333 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_00
;
334 memcpy(*hc06_ptr
+ 1, &uh
->source
, 2);
335 memcpy(*hc06_ptr
+ 3, &uh
->dest
, 2);
339 /* checksum is always inline */
340 memcpy(*hc06_ptr
, &uh
->check
, 2);
343 /* skip the UDP header */
344 skb_pull(skb
, sizeof(struct udphdr
));
347 static inline int lowpan_fetch_skb_u8(struct sk_buff
*skb
, u8
*val
)
349 if (unlikely(!pskb_may_pull(skb
, 1)))
358 static inline int lowpan_fetch_skb_u16(struct sk_buff
*skb
, u16
*val
)
360 if (unlikely(!pskb_may_pull(skb
, 2)))
363 *val
= (skb
->data
[0] << 8) | skb
->data
[1];
370 lowpan_uncompress_udp_header(struct sk_buff
*skb
, struct udphdr
*uh
)
377 if (lowpan_fetch_skb_u8(skb
, &tmp
))
380 if ((tmp
& LOWPAN_NHC_UDP_MASK
) == LOWPAN_NHC_UDP_ID
) {
381 pr_debug("UDP header uncompression\n");
382 switch (tmp
& LOWPAN_NHC_UDP_CS_P_11
) {
383 case LOWPAN_NHC_UDP_CS_P_00
:
384 memcpy(&uh
->source
, &skb
->data
[0], 2);
385 memcpy(&uh
->dest
, &skb
->data
[2], 2);
388 case LOWPAN_NHC_UDP_CS_P_01
:
389 memcpy(&uh
->source
, &skb
->data
[0], 2);
391 skb
->data
[2] + LOWPAN_NHC_UDP_8BIT_PORT
;
394 case LOWPAN_NHC_UDP_CS_P_10
:
395 uh
->source
= skb
->data
[0] + LOWPAN_NHC_UDP_8BIT_PORT
;
396 memcpy(&uh
->dest
, &skb
->data
[1], 2);
399 case LOWPAN_NHC_UDP_CS_P_11
:
401 LOWPAN_NHC_UDP_4BIT_PORT
+ (skb
->data
[0] >> 4);
403 LOWPAN_NHC_UDP_4BIT_PORT
+ (skb
->data
[0] & 0x0f);
407 pr_debug("ERROR: unknown UDP format\n");
412 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
413 uh
->source
, uh
->dest
);
416 memcpy(&uh
->check
, &skb
->data
[0], 2);
420 * UDP lenght needs to be infered from the lower layers
421 * here, we obtain the hint from the remaining size of the
424 uh
->len
= htons(skb
->len
+ sizeof(struct udphdr
));
425 pr_debug("uncompressed UDP length: src = %d", uh
->len
);
427 pr_debug("ERROR: unsupported NH format\n");
436 static int lowpan_header_create(struct sk_buff
*skb
,
437 struct net_device
*dev
,
438 unsigned short type
, const void *_daddr
,
439 const void *_saddr
, unsigned int len
)
441 u8 tmp
, iphc0
, iphc1
, *hc06_ptr
;
443 const u8
*saddr
= _saddr
;
444 const u8
*daddr
= _daddr
;
446 struct ieee802154_addr sa
, da
;
449 * if this package isn't ipv6 one, where should it be routed?
451 if (type
!= ETH_P_IPV6
)
457 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
458 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr
->version
,
459 ntohs(hdr
->payload_len
), hdr
->nexthdr
, hdr
->hop_limit
);
461 lowpan_raw_dump_table(__func__
, "raw skb network header dump",
462 skb_network_header(skb
), sizeof(struct ipv6hdr
));
465 saddr
= dev
->dev_addr
;
467 lowpan_raw_dump_inline(__func__
, "saddr", (unsigned char *)saddr
, 8);
470 * As we copy some bit-length fields, in the IPHC encoding bytes,
471 * we sometimes use |=
472 * If the field is 0, and the current bit value in memory is 1,
473 * this does not work. We therefore reset the IPHC encoding here
475 iphc0
= LOWPAN_DISPATCH_IPHC
;
478 /* TODO: context lookup */
480 lowpan_raw_dump_inline(__func__
, "daddr", (unsigned char *)daddr
, 8);
483 * Traffic class, flow label
484 * If flow label is 0, compress it. If traffic class is 0, compress it
485 * We have to process both in the same time as the offset of traffic
486 * class depends on the presence of version and flow label
489 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
490 tmp
= (hdr
->priority
<< 4) | (hdr
->flow_lbl
[0] >> 4);
491 tmp
= ((tmp
& 0x03) << 6) | (tmp
>> 2);
493 if (((hdr
->flow_lbl
[0] & 0x0F) == 0) &&
494 (hdr
->flow_lbl
[1] == 0) && (hdr
->flow_lbl
[2] == 0)) {
495 /* flow label can be compressed */
496 iphc0
|= LOWPAN_IPHC_FL_C
;
497 if ((hdr
->priority
== 0) &&
498 ((hdr
->flow_lbl
[0] & 0xF0) == 0)) {
499 /* compress (elide) all */
500 iphc0
|= LOWPAN_IPHC_TC_C
;
502 /* compress only the flow label */
507 /* Flow label cannot be compressed */
508 if ((hdr
->priority
== 0) &&
509 ((hdr
->flow_lbl
[0] & 0xF0) == 0)) {
510 /* compress only traffic class */
511 iphc0
|= LOWPAN_IPHC_TC_C
;
512 *hc06_ptr
= (tmp
& 0xc0) | (hdr
->flow_lbl
[0] & 0x0F);
513 memcpy(hc06_ptr
+ 1, &hdr
->flow_lbl
[1], 2);
516 /* compress nothing */
517 memcpy(hc06_ptr
, &hdr
, 4);
518 /* replace the top byte with new ECN | DSCP format */
524 /* NOTE: payload length is always compressed */
526 /* Next Header is compress if UDP */
527 if (hdr
->nexthdr
== UIP_PROTO_UDP
)
528 iphc0
|= LOWPAN_IPHC_NH_C
;
530 if ((iphc0
& LOWPAN_IPHC_NH_C
) == 0) {
531 *hc06_ptr
= hdr
->nexthdr
;
537 * if 1: compress, encoding is 01
538 * if 64: compress, encoding is 10
539 * if 255: compress, encoding is 11
540 * else do not compress
542 switch (hdr
->hop_limit
) {
544 iphc0
|= LOWPAN_IPHC_TTL_1
;
547 iphc0
|= LOWPAN_IPHC_TTL_64
;
550 iphc0
|= LOWPAN_IPHC_TTL_255
;
553 *hc06_ptr
= hdr
->hop_limit
;
558 /* source address compression */
559 if (is_addr_unspecified(&hdr
->saddr
)) {
560 pr_debug("source address is unspecified, setting SAC\n");
561 iphc1
|= LOWPAN_IPHC_SAC
;
562 /* TODO: context lookup */
563 } else if (is_addr_link_local(&hdr
->saddr
)) {
564 pr_debug("source address is link-local\n");
565 iphc1
|= lowpan_compress_addr_64(&hc06_ptr
,
566 LOWPAN_IPHC_SAM_BIT
, &hdr
->saddr
, saddr
);
568 pr_debug("send the full source address\n");
569 memcpy(hc06_ptr
, &hdr
->saddr
.s6_addr16
[0], 16);
573 /* destination address compression */
574 if (is_addr_mcast(&hdr
->daddr
)) {
575 pr_debug("destination address is multicast: ");
576 iphc1
|= LOWPAN_IPHC_M
;
577 if (lowpan_is_mcast_addr_compressable8(&hdr
->daddr
)) {
578 pr_debug("compressed to 1 octet\n");
579 iphc1
|= LOWPAN_IPHC_DAM_11
;
581 *hc06_ptr
= hdr
->daddr
.s6_addr
[15];
583 } else if (lowpan_is_mcast_addr_compressable32(&hdr
->daddr
)) {
584 pr_debug("compressed to 4 octets\n");
585 iphc1
|= LOWPAN_IPHC_DAM_10
;
586 /* second byte + the last three */
587 *hc06_ptr
= hdr
->daddr
.s6_addr
[1];
588 memcpy(hc06_ptr
+ 1, &hdr
->daddr
.s6_addr
[13], 3);
590 } else if (lowpan_is_mcast_addr_compressable48(&hdr
->daddr
)) {
591 pr_debug("compressed to 6 octets\n");
592 iphc1
|= LOWPAN_IPHC_DAM_01
;
593 /* second byte + the last five */
594 *hc06_ptr
= hdr
->daddr
.s6_addr
[1];
595 memcpy(hc06_ptr
+ 1, &hdr
->daddr
.s6_addr
[11], 5);
598 pr_debug("using full address\n");
599 iphc1
|= LOWPAN_IPHC_DAM_00
;
600 memcpy(hc06_ptr
, &hdr
->daddr
.s6_addr
[0], 16);
604 /* TODO: context lookup */
605 if (is_addr_link_local(&hdr
->daddr
)) {
606 pr_debug("dest address is unicast and link-local\n");
607 iphc1
|= lowpan_compress_addr_64(&hc06_ptr
,
608 LOWPAN_IPHC_DAM_BIT
, &hdr
->daddr
, daddr
);
610 pr_debug("dest address is unicast: using full one\n");
611 memcpy(hc06_ptr
, &hdr
->daddr
.s6_addr16
[0], 16);
616 /* UDP header compression */
617 if (hdr
->nexthdr
== UIP_PROTO_UDP
)
618 lowpan_compress_udp_header(&hc06_ptr
, skb
);
623 skb_pull(skb
, sizeof(struct ipv6hdr
));
624 memcpy(skb_push(skb
, hc06_ptr
- head
), head
, hc06_ptr
- head
);
626 lowpan_raw_dump_table(__func__
, "raw skb data dump", skb
->data
,
630 * NOTE1: I'm still unsure about the fact that compression and WPAN
631 * header are created here and not later in the xmit. So wait for
632 * an opinion of net maintainers.
635 * NOTE2: to be absolutely correct, we must derive PANid information
636 * from MAC subif of the 'dev' and 'real_dev' network devices, but
637 * this isn't implemented in mainline yet, so currently we assign 0xff
640 mac_cb(skb
)->flags
= IEEE802154_FC_TYPE_DATA
;
641 mac_cb(skb
)->seq
= ieee802154_mlme_ops(dev
)->get_dsn(dev
);
643 /* prepare wpan address data */
644 sa
.addr_type
= IEEE802154_ADDR_LONG
;
645 sa
.pan_id
= ieee802154_mlme_ops(dev
)->get_pan_id(dev
);
647 memcpy(&(sa
.hwaddr
), saddr
, 8);
648 /* intra-PAN communications */
649 da
.pan_id
= ieee802154_mlme_ops(dev
)->get_pan_id(dev
);
652 * if the destination address is the broadcast address, use the
653 * corresponding short address
655 if (lowpan_is_addr_broadcast(daddr
)) {
656 da
.addr_type
= IEEE802154_ADDR_SHORT
;
657 da
.short_addr
= IEEE802154_ADDR_BROADCAST
;
659 da
.addr_type
= IEEE802154_ADDR_LONG
;
660 memcpy(&(da
.hwaddr
), daddr
, IEEE802154_ADDR_LEN
);
662 /* request acknowledgment */
663 mac_cb(skb
)->flags
|= MAC_CB_FLAG_ACKREQ
;
666 return dev_hard_header(skb
, lowpan_dev_info(dev
)->real_dev
,
667 type
, (void *)&da
, (void *)&sa
, skb
->len
);
671 static int lowpan_give_skb_to_devices(struct sk_buff
*skb
)
673 struct lowpan_dev_record
*entry
;
674 struct sk_buff
*skb_cp
;
675 int stat
= NET_RX_SUCCESS
;
678 list_for_each_entry_rcu(entry
, &lowpan_devices
, list
)
679 if (lowpan_dev_info(entry
->ldev
)->real_dev
== skb
->dev
) {
680 skb_cp
= skb_copy(skb
, GFP_ATOMIC
);
686 skb_cp
->dev
= entry
->ldev
;
687 stat
= netif_rx(skb_cp
);
694 static int lowpan_skb_deliver(struct sk_buff
*skb
, struct ipv6hdr
*hdr
)
697 int stat
= NET_RX_SUCCESS
;
699 new = skb_copy_expand(skb
, sizeof(struct ipv6hdr
), skb_tailroom(skb
),
706 skb_push(new, sizeof(struct ipv6hdr
));
707 skb_reset_network_header(new);
708 skb_copy_to_linear_data(new, hdr
, sizeof(struct ipv6hdr
));
710 new->protocol
= htons(ETH_P_IPV6
);
711 new->pkt_type
= PACKET_HOST
;
713 stat
= lowpan_give_skb_to_devices(new);
720 static void lowpan_fragment_timer_expired(unsigned long entry_addr
)
722 struct lowpan_fragment
*entry
= (struct lowpan_fragment
*)entry_addr
;
724 pr_debug("timer expired for frame with tag %d\n", entry
->tag
);
726 list_del(&entry
->list
);
727 dev_kfree_skb(entry
->skb
);
731 static struct lowpan_fragment
*
732 lowpan_alloc_new_frame(struct sk_buff
*skb
, u16 len
, u16 tag
)
734 struct lowpan_fragment
*frame
;
736 frame
= kzalloc(sizeof(struct lowpan_fragment
),
741 INIT_LIST_HEAD(&frame
->list
);
746 /* allocate buffer for frame assembling */
747 frame
->skb
= netdev_alloc_skb_ip_align(skb
->dev
, frame
->length
+
748 sizeof(struct ipv6hdr
));
753 frame
->skb
->priority
= skb
->priority
;
754 frame
->skb
->dev
= skb
->dev
;
756 /* reserve headroom for uncompressed ipv6 header */
757 skb_reserve(frame
->skb
, sizeof(struct ipv6hdr
));
758 skb_put(frame
->skb
, frame
->length
);
760 /* copy the first control block to keep a
761 * trace of the link-layer addresses in case
762 * of a link-local compressed address
764 memcpy(frame
->skb
->cb
, skb
->cb
, sizeof(skb
->cb
));
766 init_timer(&frame
->timer
);
767 /* time out is the same as for ipv6 - 60 sec */
768 frame
->timer
.expires
= jiffies
+ LOWPAN_FRAG_TIMEOUT
;
769 frame
->timer
.data
= (unsigned long)frame
;
770 frame
->timer
.function
= lowpan_fragment_timer_expired
;
772 add_timer(&frame
->timer
);
774 list_add_tail(&frame
->list
, &lowpan_fragments
);
785 lowpan_process_data(struct sk_buff
*skb
)
787 struct ipv6hdr hdr
= {};
788 u8 tmp
, iphc0
, iphc1
, num_context
= 0;
789 const struct ieee802154_addr
*_saddr
, *_daddr
;
792 lowpan_raw_dump_table(__func__
, "raw skb data dump", skb
->data
,
794 /* at least two bytes will be used for the encoding */
798 if (lowpan_fetch_skb_u8(skb
, &iphc0
))
801 /* fragments assembling */
802 switch (iphc0
& LOWPAN_DISPATCH_MASK
) {
803 case LOWPAN_DISPATCH_FRAG1
:
804 case LOWPAN_DISPATCH_FRAGN
:
806 struct lowpan_fragment
*frame
;
807 /* slen stores the rightmost 8 bits of the 11 bits length */
812 if (lowpan_fetch_skb_u8(skb
, &slen
) || /* frame length */
813 lowpan_fetch_skb_u16(skb
, &tag
)) /* fragment tag */
816 /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
817 len
= ((iphc0
& 7) << 8) | slen
;
819 if ((iphc0
& LOWPAN_DISPATCH_MASK
) == LOWPAN_DISPATCH_FRAG1
) {
820 pr_debug("%s received a FRAG1 packet (tag: %d, "
821 "size of the entire IP packet: %d)",
824 if (lowpan_fetch_skb_u8(skb
, &offset
))
825 goto unlock_and_drop
;
826 pr_debug("%s received a FRAGN packet (tag: %d, "
827 "size of the entire IP packet: %d, "
828 "offset: %d)", __func__
, tag
, len
, offset
* 8);
832 * check if frame assembling with the same tag is
833 * already in progress
835 spin_lock_bh(&flist_lock
);
837 list_for_each_entry(frame
, &lowpan_fragments
, list
)
838 if (frame
->tag
== tag
) {
843 /* alloc new frame structure */
845 pr_debug("%s first fragment received for tag %d, "
846 "begin packet reassembly", __func__
, tag
);
847 frame
= lowpan_alloc_new_frame(skb
, len
, tag
);
849 goto unlock_and_drop
;
852 /* if payload fits buffer, copy it */
853 if (likely((offset
* 8 + skb
->len
) <= frame
->length
))
854 skb_copy_to_linear_data_offset(frame
->skb
, offset
* 8,
855 skb
->data
, skb
->len
);
857 goto unlock_and_drop
;
859 frame
->bytes_rcv
+= skb
->len
;
861 /* frame assembling complete */
862 if ((frame
->bytes_rcv
== frame
->length
) &&
863 frame
->timer
.expires
> jiffies
) {
864 /* if timer haven't expired - first of all delete it */
865 del_timer_sync(&frame
->timer
);
866 list_del(&frame
->list
);
867 spin_unlock_bh(&flist_lock
);
869 pr_debug("%s successfully reassembled fragment "
870 "(tag %d)", __func__
, tag
);
876 if (lowpan_fetch_skb_u8(skb
, &iphc0
))
881 spin_unlock_bh(&flist_lock
);
883 return kfree_skb(skb
), 0;
889 if (lowpan_fetch_skb_u8(skb
, &iphc1
))
892 _saddr
= &mac_cb(skb
)->sa
;
893 _daddr
= &mac_cb(skb
)->da
;
895 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0
, iphc1
);
897 /* another if the CID flag is set */
898 if (iphc1
& LOWPAN_IPHC_CID
) {
899 pr_debug("CID flag is set, increase header with one\n");
900 if (lowpan_fetch_skb_u8(skb
, &num_context
))
906 /* Traffic Class and Flow Label */
907 switch ((iphc0
& LOWPAN_IPHC_TF
) >> 3) {
909 * Traffic Class and FLow Label carried in-line
910 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
913 if (lowpan_fetch_skb_u8(skb
, &tmp
))
916 memcpy(&hdr
.flow_lbl
, &skb
->data
[0], 3);
918 hdr
.priority
= ((tmp
>> 2) & 0x0f);
919 hdr
.flow_lbl
[0] = ((tmp
>> 2) & 0x30) | (tmp
<< 6) |
920 (hdr
.flow_lbl
[0] & 0x0f);
923 * Traffic class carried in-line
924 * ECN + DSCP (1 byte), Flow Label is elided
927 if (lowpan_fetch_skb_u8(skb
, &tmp
))
930 hdr
.priority
= ((tmp
>> 2) & 0x0f);
931 hdr
.flow_lbl
[0] = ((tmp
<< 6) & 0xC0) | ((tmp
>> 2) & 0x30);
934 * Flow Label carried in-line
935 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
938 if (lowpan_fetch_skb_u8(skb
, &tmp
))
941 hdr
.flow_lbl
[0] = (skb
->data
[0] & 0x0F) | ((tmp
>> 2) & 0x30);
942 memcpy(&hdr
.flow_lbl
[1], &skb
->data
[0], 2);
945 /* Traffic Class and Flow Label are elided */
953 if ((iphc0
& LOWPAN_IPHC_NH_C
) == 0) {
954 /* Next header is carried inline */
955 if (lowpan_fetch_skb_u8(skb
, &(hdr
.nexthdr
)))
958 pr_debug("NH flag is set, next header carried inline: %02x\n",
963 if ((iphc0
& 0x03) != LOWPAN_IPHC_TTL_I
)
964 hdr
.hop_limit
= lowpan_ttl_values
[iphc0
& 0x03];
966 if (lowpan_fetch_skb_u8(skb
, &(hdr
.hop_limit
)))
970 /* Extract SAM to the tmp variable */
971 tmp
= ((iphc1
& LOWPAN_IPHC_SAM
) >> LOWPAN_IPHC_SAM_BIT
) & 0x03;
973 /* Source address uncompression */
974 pr_debug("source address stateless compression\n");
975 err
= lowpan_uncompress_addr(skb
, &hdr
.saddr
, tmp
, _saddr
);
979 /* Extract DAM to the tmp variable */
980 tmp
= ((iphc1
& LOWPAN_IPHC_DAM_11
) >> LOWPAN_IPHC_DAM_BIT
) & 0x03;
982 /* check for Multicast Compression */
983 if (iphc1
& LOWPAN_IPHC_M
) {
984 if (iphc1
& LOWPAN_IPHC_DAC
) {
985 pr_debug("dest: context-based mcast compression\n");
986 /* TODO: implement this */
988 err
= lowpan_uncompress_multicast_daddr(
989 skb
, &hdr
.daddr
, tmp
);
994 pr_debug("dest: stateless compression\n");
995 err
= lowpan_uncompress_addr(skb
, &hdr
.daddr
, tmp
, _daddr
);
1000 /* UDP data uncompression */
1001 if (iphc0
& LOWPAN_IPHC_NH_C
) {
1003 struct sk_buff
*new;
1004 if (lowpan_uncompress_udp_header(skb
, &uh
))
1008 * replace the compressed UDP head by the uncompressed UDP
1011 new = skb_copy_expand(skb
, sizeof(struct udphdr
),
1012 skb_tailroom(skb
), GFP_ATOMIC
);
1020 skb_push(skb
, sizeof(struct udphdr
));
1021 skb_reset_transport_header(skb
);
1022 skb_copy_to_linear_data(skb
, &uh
, sizeof(struct udphdr
));
1024 lowpan_raw_dump_table(__func__
, "raw UDP header dump",
1025 (u8
*)&uh
, sizeof(uh
));
1027 hdr
.nexthdr
= UIP_PROTO_UDP
;
1030 /* Not fragmented package */
1031 hdr
.payload_len
= htons(skb
->len
);
1033 pr_debug("skb headroom size = %d, data length = %d\n",
1034 skb_headroom(skb
), skb
->len
);
1036 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
1037 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr
.version
,
1038 ntohs(hdr
.payload_len
), hdr
.nexthdr
, hdr
.hop_limit
);
1040 lowpan_raw_dump_table(__func__
, "raw header dump", (u8
*)&hdr
,
1042 return lowpan_skb_deliver(skb
, &hdr
);
1045 spin_unlock_bh(&flist_lock
);
1051 static int lowpan_set_address(struct net_device
*dev
, void *p
)
1053 struct sockaddr
*sa
= p
;
1055 if (netif_running(dev
))
1058 /* TODO: validate addr */
1059 memcpy(dev
->dev_addr
, sa
->sa_data
, dev
->addr_len
);
1064 static int lowpan_get_mac_header_length(struct sk_buff
*skb
)
1067 * Currently long addressing mode is supported only, so the overall
1068 * header size is 21:
1069 * FC SeqNum DPAN DA SA Sec
1070 * 2 + 1 + 2 + 8 + 8 + 0 = 21
1076 lowpan_fragment_xmit(struct sk_buff
*skb
, u8
*head
,
1077 int mlen
, int plen
, int offset
, int type
)
1079 struct sk_buff
*frag
;
1082 hlen
= (type
== LOWPAN_DISPATCH_FRAG1
) ?
1083 LOWPAN_FRAG1_HEAD_SIZE
: LOWPAN_FRAGN_HEAD_SIZE
;
1085 lowpan_raw_dump_inline(__func__
, "6lowpan fragment header", head
, hlen
);
1087 frag
= dev_alloc_skb(hlen
+ mlen
+ plen
+ IEEE802154_MFR_SIZE
);
1091 frag
->priority
= skb
->priority
;
1092 frag
->dev
= skb
->dev
;
1094 /* copy header, MFR and payload */
1095 memcpy(skb_put(frag
, mlen
), skb
->data
, mlen
);
1096 memcpy(skb_put(frag
, hlen
), head
, hlen
);
1099 skb_copy_from_linear_data_offset(skb
, offset
+ mlen
,
1100 skb_put(frag
, plen
), plen
);
1102 lowpan_raw_dump_table(__func__
, " raw fragment dump", frag
->data
,
1105 ret
= dev_queue_xmit(frag
);
1111 lowpan_skb_fragmentation(struct sk_buff
*skb
, struct net_device
*dev
)
1113 int err
, header_length
, payload_length
, tag
, offset
= 0;
1116 header_length
= lowpan_get_mac_header_length(skb
);
1117 payload_length
= skb
->len
- header_length
;
1118 tag
= lowpan_dev_info(dev
)->fragment_tag
++;
1120 /* first fragment header */
1121 head
[0] = LOWPAN_DISPATCH_FRAG1
| ((payload_length
>> 8) & 0x7);
1122 head
[1] = payload_length
& 0xff;
1124 head
[3] = tag
& 0xff;
1126 err
= lowpan_fragment_xmit(skb
, head
, header_length
, LOWPAN_FRAG_SIZE
,
1127 0, LOWPAN_DISPATCH_FRAG1
);
1130 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
1135 offset
= LOWPAN_FRAG_SIZE
;
1137 /* next fragment header */
1138 head
[0] &= ~LOWPAN_DISPATCH_FRAG1
;
1139 head
[0] |= LOWPAN_DISPATCH_FRAGN
;
1141 while ((payload_length
- offset
> 0) && (err
>= 0)) {
1142 int len
= LOWPAN_FRAG_SIZE
;
1144 head
[4] = offset
/ 8;
1146 if (payload_length
- offset
< len
)
1147 len
= payload_length
- offset
;
1149 err
= lowpan_fragment_xmit(skb
, head
, header_length
,
1150 len
, offset
, LOWPAN_DISPATCH_FRAGN
);
1152 pr_debug("%s unable to send a subsequent FRAGN packet "
1153 "(tag: %d, offset: %d", __func__
, tag
, offset
);
1164 static netdev_tx_t
lowpan_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1168 pr_debug("package xmit\n");
1170 skb
->dev
= lowpan_dev_info(dev
)->real_dev
;
1171 if (skb
->dev
== NULL
) {
1172 pr_debug("ERROR: no real wpan device found\n");
1176 /* Send directly if less than the MTU minus the 2 checksum bytes. */
1177 if (skb
->len
<= IEEE802154_MTU
- IEEE802154_MFR_SIZE
) {
1178 err
= dev_queue_xmit(skb
);
1182 pr_debug("frame is too big, fragmentation is needed\n");
1183 err
= lowpan_skb_fragmentation(skb
, dev
);
1188 pr_debug("ERROR: xmit failed\n");
1190 return (err
< 0) ? NET_XMIT_DROP
: err
;
1193 static struct wpan_phy
*lowpan_get_phy(const struct net_device
*dev
)
1195 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1196 return ieee802154_mlme_ops(real_dev
)->get_phy(real_dev
);
1199 static u16
lowpan_get_pan_id(const struct net_device
*dev
)
1201 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1202 return ieee802154_mlme_ops(real_dev
)->get_pan_id(real_dev
);
1205 static u16
lowpan_get_short_addr(const struct net_device
*dev
)
1207 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1208 return ieee802154_mlme_ops(real_dev
)->get_short_addr(real_dev
);
1211 static u8
lowpan_get_dsn(const struct net_device
*dev
)
1213 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1214 return ieee802154_mlme_ops(real_dev
)->get_dsn(real_dev
);
1217 static struct header_ops lowpan_header_ops
= {
1218 .create
= lowpan_header_create
,
1221 static const struct net_device_ops lowpan_netdev_ops
= {
1222 .ndo_start_xmit
= lowpan_xmit
,
1223 .ndo_set_mac_address
= lowpan_set_address
,
1226 static struct ieee802154_mlme_ops lowpan_mlme
= {
1227 .get_pan_id
= lowpan_get_pan_id
,
1228 .get_phy
= lowpan_get_phy
,
1229 .get_short_addr
= lowpan_get_short_addr
,
1230 .get_dsn
= lowpan_get_dsn
,
1233 static void lowpan_setup(struct net_device
*dev
)
1235 dev
->addr_len
= IEEE802154_ADDR_LEN
;
1236 memset(dev
->broadcast
, 0xff, IEEE802154_ADDR_LEN
);
1237 dev
->type
= ARPHRD_IEEE802154
;
1238 /* Frame Control + Sequence Number + Address fields + Security Header */
1239 dev
->hard_header_len
= 2 + 1 + 20 + 14;
1240 dev
->needed_tailroom
= 2; /* FCS */
1242 dev
->tx_queue_len
= 0;
1243 dev
->flags
= IFF_BROADCAST
| IFF_MULTICAST
;
1244 dev
->watchdog_timeo
= 0;
1246 dev
->netdev_ops
= &lowpan_netdev_ops
;
1247 dev
->header_ops
= &lowpan_header_ops
;
1248 dev
->ml_priv
= &lowpan_mlme
;
1249 dev
->destructor
= free_netdev
;
1252 static int lowpan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1254 if (tb
[IFLA_ADDRESS
]) {
1255 if (nla_len(tb
[IFLA_ADDRESS
]) != IEEE802154_ADDR_LEN
)
1261 static int lowpan_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1262 struct packet_type
*pt
, struct net_device
*orig_dev
)
1264 struct sk_buff
*local_skb
;
1266 if (!netif_running(dev
))
1269 if (dev
->type
!= ARPHRD_IEEE802154
)
1272 /* check that it's our buffer */
1273 if (skb
->data
[0] == LOWPAN_DISPATCH_IPV6
) {
1274 /* Copy the packet so that the IPv6 header is
1277 local_skb
= skb_copy_expand(skb
, NET_SKB_PAD
- 1,
1278 skb_tailroom(skb
), GFP_ATOMIC
);
1282 local_skb
->protocol
= htons(ETH_P_IPV6
);
1283 local_skb
->pkt_type
= PACKET_HOST
;
1285 /* Pull off the 1-byte of 6lowpan header. */
1286 skb_pull(local_skb
, 1);
1287 skb_reset_network_header(local_skb
);
1288 skb_set_transport_header(local_skb
, sizeof(struct ipv6hdr
));
1290 lowpan_give_skb_to_devices(local_skb
);
1292 kfree_skb(local_skb
);
1295 switch (skb
->data
[0] & 0xe0) {
1296 case LOWPAN_DISPATCH_IPHC
: /* ipv6 datagram */
1297 case LOWPAN_DISPATCH_FRAG1
: /* first fragment header */
1298 case LOWPAN_DISPATCH_FRAGN
: /* next fragments headers */
1299 local_skb
= skb_clone(skb
, GFP_ATOMIC
);
1302 lowpan_process_data(local_skb
);
1311 return NET_RX_SUCCESS
;
1318 static int lowpan_newlink(struct net
*src_net
, struct net_device
*dev
,
1319 struct nlattr
*tb
[], struct nlattr
*data
[])
1321 struct net_device
*real_dev
;
1322 struct lowpan_dev_record
*entry
;
1324 pr_debug("adding new link\n");
1328 /* find and hold real wpan device */
1329 real_dev
= dev_get_by_index(src_net
, nla_get_u32(tb
[IFLA_LINK
]));
1333 lowpan_dev_info(dev
)->real_dev
= real_dev
;
1334 lowpan_dev_info(dev
)->fragment_tag
= 0;
1335 mutex_init(&lowpan_dev_info(dev
)->dev_list_mtx
);
1337 entry
= kzalloc(sizeof(struct lowpan_dev_record
), GFP_KERNEL
);
1340 lowpan_dev_info(dev
)->real_dev
= NULL
;
1346 mutex_lock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1347 INIT_LIST_HEAD(&entry
->list
);
1348 list_add_tail(&entry
->list
, &lowpan_devices
);
1349 mutex_unlock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1351 register_netdevice(dev
);
1356 static void lowpan_dellink(struct net_device
*dev
, struct list_head
*head
)
1358 struct lowpan_dev_info
*lowpan_dev
= lowpan_dev_info(dev
);
1359 struct net_device
*real_dev
= lowpan_dev
->real_dev
;
1360 struct lowpan_dev_record
*entry
, *tmp
;
1364 mutex_lock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1365 list_for_each_entry_safe(entry
, tmp
, &lowpan_devices
, list
) {
1366 if (entry
->ldev
== dev
) {
1367 list_del(&entry
->list
);
1371 mutex_unlock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1373 mutex_destroy(&lowpan_dev_info(dev
)->dev_list_mtx
);
1375 unregister_netdevice_queue(dev
, head
);
1380 static struct rtnl_link_ops lowpan_link_ops __read_mostly
= {
1382 .priv_size
= sizeof(struct lowpan_dev_info
),
1383 .setup
= lowpan_setup
,
1384 .newlink
= lowpan_newlink
,
1385 .dellink
= lowpan_dellink
,
1386 .validate
= lowpan_validate
,
1389 static inline int __init
lowpan_netlink_init(void)
1391 return rtnl_link_register(&lowpan_link_ops
);
1394 static inline void lowpan_netlink_fini(void)
1396 rtnl_link_unregister(&lowpan_link_ops
);
1399 static int lowpan_device_event(struct notifier_block
*unused
,
1400 unsigned long event
, void *ptr
)
1402 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1403 LIST_HEAD(del_list
);
1404 struct lowpan_dev_record
*entry
, *tmp
;
1406 if (dev
->type
!= ARPHRD_IEEE802154
)
1409 if (event
== NETDEV_UNREGISTER
) {
1410 list_for_each_entry_safe(entry
, tmp
, &lowpan_devices
, list
) {
1411 if (lowpan_dev_info(entry
->ldev
)->real_dev
== dev
)
1412 lowpan_dellink(entry
->ldev
, &del_list
);
1415 unregister_netdevice_many(&del_list
);
1422 static struct notifier_block lowpan_dev_notifier
= {
1423 .notifier_call
= lowpan_device_event
,
1426 static struct packet_type lowpan_packet_type
= {
1427 .type
= __constant_htons(ETH_P_IEEE802154
),
1431 static int __init
lowpan_init_module(void)
1435 err
= lowpan_netlink_init();
1439 dev_add_pack(&lowpan_packet_type
);
1441 err
= register_netdevice_notifier(&lowpan_dev_notifier
);
1443 dev_remove_pack(&lowpan_packet_type
);
1444 lowpan_netlink_fini();
1450 static void __exit
lowpan_cleanup_module(void)
1452 struct lowpan_fragment
*frame
, *tframe
;
1454 lowpan_netlink_fini();
1456 dev_remove_pack(&lowpan_packet_type
);
1458 unregister_netdevice_notifier(&lowpan_dev_notifier
);
1460 /* Now 6lowpan packet_type is removed, so no new fragments are
1461 * expected on RX, therefore that's the time to clean incomplete
1464 spin_lock_bh(&flist_lock
);
1465 list_for_each_entry_safe(frame
, tframe
, &lowpan_fragments
, list
) {
1466 del_timer_sync(&frame
->timer
);
1467 list_del(&frame
->list
);
1468 dev_kfree_skb(frame
->skb
);
1471 spin_unlock_bh(&flist_lock
);
1474 module_init(lowpan_init_module
);
1475 module_exit(lowpan_cleanup_module
);
1476 MODULE_LICENSE("GPL");
1477 MODULE_ALIAS_RTNL_LINK("lowpan");