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 <linux/etherdevice.h>
59 #include <net/af_ieee802154.h>
60 #include <net/ieee802154.h>
61 #include <net/ieee802154_netdev.h>
66 /* TTL uncompression values */
67 static const u8 lowpan_ttl_values
[] = {0, 1, 64, 255};
69 static LIST_HEAD(lowpan_devices
);
72 * Uncompression of linklocal:
73 * 0 -> 16 bytes from packet
74 * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet
75 * 2 -> 2 bytes from prefix - zeroes + 2 from packet
76 * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr
78 * NOTE: => the uncompress function does change 0xf to 0x10
79 * NOTE: 0x00 => no-autoconfig => unspecified
81 static const u8 lowpan_unc_llconf
[] = {0x0f, 0x28, 0x22, 0x20};
84 * Uncompression of ctx-based:
85 * 0 -> 0 bits from packet [unspecified / reserved]
86 * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet
87 * 2 -> 8 bytes from prefix - zeroes + 2 from packet
88 * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr
90 static const u8 lowpan_unc_ctxconf
[] = {0x00, 0x88, 0x82, 0x80};
93 * Uncompression of ctx-base
94 * 0 -> 0 bits from packet
95 * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet
96 * 2 -> 2 bytes from prefix - zeroes + 3 from packet
97 * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr
99 static const u8 lowpan_unc_mxconf
[] = {0x0f, 0x25, 0x23, 0x21};
101 /* Link local prefix */
102 static const u8 lowpan_llprefix
[] = {0xfe, 0x80};
104 /* private device info */
105 struct lowpan_dev_info
{
106 struct net_device
*real_dev
; /* real WPAN device ptr */
107 struct mutex dev_list_mtx
; /* mutex for list ops */
110 struct lowpan_dev_record
{
111 struct net_device
*ldev
;
112 struct list_head list
;
115 struct lowpan_fragment
{
116 struct sk_buff
*skb
; /* skb to be assembled */
117 spinlock_t lock
; /* concurency lock */
118 u16 length
; /* length to be assemled */
119 u32 bytes_rcv
; /* bytes received */
120 u16 tag
; /* current fragment tag */
121 struct timer_list timer
; /* assembling timer */
122 struct list_head list
; /* fragments list */
125 static unsigned short fragment_tag
;
126 static LIST_HEAD(lowpan_fragments
);
127 spinlock_t flist_lock
;
130 lowpan_dev_info
*lowpan_dev_info(const struct net_device
*dev
)
132 return netdev_priv(dev
);
135 static inline void lowpan_address_flip(u8
*src
, u8
*dest
)
138 for (i
= 0; i
< IEEE802154_ADDR_LEN
; i
++)
139 (dest
)[IEEE802154_ADDR_LEN
- i
- 1] = (src
)[i
];
142 /* list of all 6lowpan devices, uses for package delivering */
143 /* print data in line */
144 static inline void lowpan_raw_dump_inline(const char *caller
, char *msg
,
145 unsigned char *buf
, int len
)
149 pr_debug("(%s) %s: ", caller
, msg
);
150 print_hex_dump(KERN_DEBUG
, "", DUMP_PREFIX_NONE
,
151 16, 1, buf
, len
, false);
156 * print data in a table format:
158 * addr: xx xx xx xx xx xx
159 * addr: xx xx xx xx xx xx
162 static inline void lowpan_raw_dump_table(const char *caller
, char *msg
,
163 unsigned char *buf
, int len
)
167 pr_debug("(%s) %s:\n", caller
, msg
);
168 print_hex_dump(KERN_DEBUG
, "\t", DUMP_PREFIX_OFFSET
,
169 16, 1, buf
, len
, false);
174 lowpan_compress_addr_64(u8
**hc06_ptr
, u8 shift
, const struct in6_addr
*ipaddr
,
175 const unsigned char *lladdr
)
179 if (is_addr_mac_addr_based(ipaddr
, lladdr
))
180 val
= 3; /* 0-bits */
181 else if (lowpan_is_iid_16_bit_compressable(ipaddr
)) {
182 /* compress IID to 16 bits xxxx::XXXX */
183 memcpy(*hc06_ptr
, &ipaddr
->s6_addr16
[7], 2);
185 val
= 2; /* 16-bits */
187 /* do not compress IID => xxxx::IID */
188 memcpy(*hc06_ptr
, &ipaddr
->s6_addr16
[4], 8);
190 val
= 1; /* 64-bits */
193 return rol8(val
, shift
);
197 lowpan_uip_ds6_set_addr_iid(struct in6_addr
*ipaddr
, unsigned char *lladdr
)
199 memcpy(&ipaddr
->s6_addr
[8], lladdr
, IEEE802154_ADDR_LEN
);
200 /* second bit-flip (Universe/Local) is done according RFC2464 */
201 ipaddr
->s6_addr
[8] ^= 0x02;
205 * Uncompress addresses based on a prefix and a postfix with zeroes in
206 * between. If the postfix is zero in length it will use the link address
207 * to configure the IP address (autoconf style).
208 * pref_post_count takes a byte where the first nibble specify prefix count
209 * and the second postfix count (NOTE: 15/0xf => 16 bytes copy).
212 lowpan_uncompress_addr(struct sk_buff
*skb
, struct in6_addr
*ipaddr
,
213 u8
const *prefix
, u8 pref_post_count
, unsigned char *lladdr
)
215 u8 prefcount
= pref_post_count
>> 4;
216 u8 postcount
= pref_post_count
& 0x0f;
218 /* full nibble 15 => 16 */
219 prefcount
= (prefcount
== 15 ? 16 : prefcount
);
220 postcount
= (postcount
== 15 ? 16 : postcount
);
223 lowpan_raw_dump_inline(__func__
, "linklocal address",
224 lladdr
, IEEE802154_ADDR_LEN
);
226 memcpy(ipaddr
, prefix
, prefcount
);
228 if (prefcount
+ postcount
< 16)
229 memset(&ipaddr
->s6_addr
[prefcount
], 0,
230 16 - (prefcount
+ postcount
));
233 memcpy(&ipaddr
->s6_addr
[16 - postcount
], skb
->data
, postcount
);
234 skb_pull(skb
, postcount
);
235 } else if (prefcount
> 0) {
239 /* no IID based configuration if no prefix and no data */
240 lowpan_uip_ds6_set_addr_iid(ipaddr
, lladdr
);
243 pr_debug("(%s): uncompressing %d + %d => ", __func__
, prefcount
,
245 lowpan_raw_dump_inline(NULL
, NULL
, ipaddr
->s6_addr
, 16);
251 lowpan_compress_udp_header(u8
**hc06_ptr
, struct sk_buff
*skb
)
253 struct udphdr
*uh
= udp_hdr(skb
);
255 pr_debug("(%s): UDP header compression\n", __func__
);
257 if (((uh
->source
& LOWPAN_NHC_UDP_4BIT_MASK
) ==
258 LOWPAN_NHC_UDP_4BIT_PORT
) &&
259 ((uh
->dest
& LOWPAN_NHC_UDP_4BIT_MASK
) ==
260 LOWPAN_NHC_UDP_4BIT_PORT
)) {
261 pr_debug("(%s): both ports compression to 4 bits\n", __func__
);
262 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_11
;
263 **(hc06_ptr
+ 1) = /* subtraction is faster */
264 (u8
)((uh
->dest
- LOWPAN_NHC_UDP_4BIT_PORT
) +
265 ((uh
->source
& LOWPAN_NHC_UDP_4BIT_PORT
) << 4));
267 } else if ((uh
->dest
& LOWPAN_NHC_UDP_8BIT_MASK
) ==
268 LOWPAN_NHC_UDP_8BIT_PORT
) {
269 pr_debug("(%s): remove 8 bits of dest\n", __func__
);
270 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_01
;
271 memcpy(*hc06_ptr
+ 1, &uh
->source
, 2);
272 **(hc06_ptr
+ 3) = (u8
)(uh
->dest
- LOWPAN_NHC_UDP_8BIT_PORT
);
274 } else if ((uh
->source
& LOWPAN_NHC_UDP_8BIT_MASK
) ==
275 LOWPAN_NHC_UDP_8BIT_PORT
) {
276 pr_debug("(%s): remove 8 bits of source\n", __func__
);
277 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_10
;
278 memcpy(*hc06_ptr
+ 1, &uh
->dest
, 2);
279 **(hc06_ptr
+ 3) = (u8
)(uh
->source
- LOWPAN_NHC_UDP_8BIT_PORT
);
282 pr_debug("(%s): can't compress header\n", __func__
);
283 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_00
;
284 memcpy(*hc06_ptr
+ 1, &uh
->source
, 2);
285 memcpy(*hc06_ptr
+ 3, &uh
->dest
, 2);
289 /* checksum is always inline */
290 memcpy(*hc06_ptr
, &uh
->check
, 2);
294 static u8
lowpan_fetch_skb_u8(struct sk_buff
*skb
)
304 static u16
lowpan_fetch_skb_u16(struct sk_buff
*skb
)
308 BUG_ON(!pskb_may_pull(skb
, 2));
310 ret
= skb
->data
[0] | (skb
->data
[1] << 8);
316 lowpan_uncompress_udp_header(struct sk_buff
*skb
)
318 struct udphdr
*uh
= udp_hdr(skb
);
321 tmp
= lowpan_fetch_skb_u8(skb
);
323 if ((tmp
& LOWPAN_NHC_UDP_MASK
) == LOWPAN_NHC_UDP_ID
) {
324 pr_debug("(%s): UDP header uncompression\n", __func__
);
325 switch (tmp
& LOWPAN_NHC_UDP_CS_P_11
) {
326 case LOWPAN_NHC_UDP_CS_P_00
:
327 memcpy(&uh
->source
, &skb
->data
[0], 2);
328 memcpy(&uh
->dest
, &skb
->data
[2], 2);
331 case LOWPAN_NHC_UDP_CS_P_01
:
332 memcpy(&uh
->source
, &skb
->data
[0], 2);
334 skb
->data
[2] + LOWPAN_NHC_UDP_8BIT_PORT
;
337 case LOWPAN_NHC_UDP_CS_P_10
:
338 uh
->source
= skb
->data
[0] + LOWPAN_NHC_UDP_8BIT_PORT
;
339 memcpy(&uh
->dest
, &skb
->data
[1], 2);
342 case LOWPAN_NHC_UDP_CS_P_11
:
344 LOWPAN_NHC_UDP_4BIT_PORT
+ (skb
->data
[0] >> 4);
346 LOWPAN_NHC_UDP_4BIT_PORT
+ (skb
->data
[0] & 0x0f);
350 pr_debug("(%s) ERROR: unknown UDP format\n", __func__
);
355 pr_debug("(%s): uncompressed UDP ports: src = %d, dst = %d\n",
356 __func__
, uh
->source
, uh
->dest
);
359 memcpy(&uh
->check
, &skb
->data
[0], 2);
362 pr_debug("(%s): ERROR: unsupported NH format\n", __func__
);
371 static int lowpan_header_create(struct sk_buff
*skb
,
372 struct net_device
*dev
,
373 unsigned short type
, const void *_daddr
,
374 const void *_saddr
, unsigned int len
)
376 u8 tmp
, iphc0
, iphc1
, *hc06_ptr
;
378 const u8
*saddr
= _saddr
;
379 const u8
*daddr
= _daddr
;
381 struct ieee802154_addr sa
, da
;
383 if (type
!= ETH_P_IPV6
)
386 * if this package isn't ipv6 one, where should it be routed?
388 head
= kzalloc(100, GFP_KERNEL
);
395 pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
396 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__
,
397 hdr
->version
, ntohs(hdr
->payload_len
), hdr
->nexthdr
,
400 lowpan_raw_dump_table(__func__
, "raw skb network header dump",
401 skb_network_header(skb
), sizeof(struct ipv6hdr
));
404 saddr
= dev
->dev_addr
;
406 lowpan_raw_dump_inline(__func__
, "saddr", (unsigned char *)saddr
, 8);
409 * As we copy some bit-length fields, in the IPHC encoding bytes,
410 * we sometimes use |=
411 * If the field is 0, and the current bit value in memory is 1,
412 * this does not work. We therefore reset the IPHC encoding here
414 iphc0
= LOWPAN_DISPATCH_IPHC
;
417 /* TODO: context lookup */
419 lowpan_raw_dump_inline(__func__
, "daddr", (unsigned char *)daddr
, 8);
422 * Traffic class, flow label
423 * If flow label is 0, compress it. If traffic class is 0, compress it
424 * We have to process both in the same time as the offset of traffic
425 * class depends on the presence of version and flow label
428 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
429 tmp
= (hdr
->priority
<< 4) | (hdr
->flow_lbl
[0] >> 4);
430 tmp
= ((tmp
& 0x03) << 6) | (tmp
>> 2);
432 if (((hdr
->flow_lbl
[0] & 0x0F) == 0) &&
433 (hdr
->flow_lbl
[1] == 0) && (hdr
->flow_lbl
[2] == 0)) {
434 /* flow label can be compressed */
435 iphc0
|= LOWPAN_IPHC_FL_C
;
436 if ((hdr
->priority
== 0) &&
437 ((hdr
->flow_lbl
[0] & 0xF0) == 0)) {
438 /* compress (elide) all */
439 iphc0
|= LOWPAN_IPHC_TC_C
;
441 /* compress only the flow label */
446 /* Flow label cannot be compressed */
447 if ((hdr
->priority
== 0) &&
448 ((hdr
->flow_lbl
[0] & 0xF0) == 0)) {
449 /* compress only traffic class */
450 iphc0
|= LOWPAN_IPHC_TC_C
;
451 *hc06_ptr
= (tmp
& 0xc0) | (hdr
->flow_lbl
[0] & 0x0F);
452 memcpy(hc06_ptr
+ 1, &hdr
->flow_lbl
[1], 2);
455 /* compress nothing */
456 memcpy(hc06_ptr
, &hdr
, 4);
457 /* replace the top byte with new ECN | DSCP format */
463 /* NOTE: payload length is always compressed */
465 /* Next Header is compress if UDP */
466 if (hdr
->nexthdr
== UIP_PROTO_UDP
)
467 iphc0
|= LOWPAN_IPHC_NH_C
;
469 if ((iphc0
& LOWPAN_IPHC_NH_C
) == 0) {
470 *hc06_ptr
= hdr
->nexthdr
;
476 * if 1: compress, encoding is 01
477 * if 64: compress, encoding is 10
478 * if 255: compress, encoding is 11
479 * else do not compress
481 switch (hdr
->hop_limit
) {
483 iphc0
|= LOWPAN_IPHC_TTL_1
;
486 iphc0
|= LOWPAN_IPHC_TTL_64
;
489 iphc0
|= LOWPAN_IPHC_TTL_255
;
492 *hc06_ptr
= hdr
->hop_limit
;
496 /* source address compression */
497 if (is_addr_unspecified(&hdr
->saddr
)) {
498 pr_debug("(%s): source address is unspecified, setting SAC\n",
500 iphc1
|= LOWPAN_IPHC_SAC
;
501 /* TODO: context lookup */
502 } else if (is_addr_link_local(&hdr
->saddr
)) {
503 pr_debug("(%s): source address is link-local\n", __func__
);
504 iphc1
|= lowpan_compress_addr_64(&hc06_ptr
,
505 LOWPAN_IPHC_SAM_BIT
, &hdr
->saddr
, saddr
);
507 pr_debug("(%s): send the full source address\n", __func__
);
508 memcpy(hc06_ptr
, &hdr
->saddr
.s6_addr16
[0], 16);
512 /* destination address compression */
513 if (is_addr_mcast(&hdr
->daddr
)) {
514 pr_debug("(%s): destination address is multicast", __func__
);
515 iphc1
|= LOWPAN_IPHC_M
;
516 if (lowpan_is_mcast_addr_compressable8(&hdr
->daddr
)) {
517 pr_debug("compressed to 1 octet\n");
518 iphc1
|= LOWPAN_IPHC_DAM_11
;
520 *hc06_ptr
= hdr
->daddr
.s6_addr
[15];
522 } else if (lowpan_is_mcast_addr_compressable32(&hdr
->daddr
)) {
523 pr_debug("compressed to 4 octets\n");
524 iphc1
|= LOWPAN_IPHC_DAM_10
;
525 /* second byte + the last three */
526 *hc06_ptr
= hdr
->daddr
.s6_addr
[1];
527 memcpy(hc06_ptr
+ 1, &hdr
->daddr
.s6_addr
[13], 3);
529 } else if (lowpan_is_mcast_addr_compressable48(&hdr
->daddr
)) {
530 pr_debug("compressed to 6 octets\n");
531 iphc1
|= LOWPAN_IPHC_DAM_01
;
532 /* second byte + the last five */
533 *hc06_ptr
= hdr
->daddr
.s6_addr
[1];
534 memcpy(hc06_ptr
+ 1, &hdr
->daddr
.s6_addr
[11], 5);
537 pr_debug("using full address\n");
538 iphc1
|= LOWPAN_IPHC_DAM_00
;
539 memcpy(hc06_ptr
, &hdr
->daddr
.s6_addr
[0], 16);
543 pr_debug("(%s): destination address is unicast: ", __func__
);
544 /* TODO: context lookup */
545 if (is_addr_link_local(&hdr
->daddr
)) {
546 pr_debug("destination address is link-local\n");
547 iphc1
|= lowpan_compress_addr_64(&hc06_ptr
,
548 LOWPAN_IPHC_DAM_BIT
, &hdr
->daddr
, daddr
);
550 pr_debug("using full address\n");
551 memcpy(hc06_ptr
, &hdr
->daddr
.s6_addr16
[0], 16);
556 /* UDP header compression */
557 if (hdr
->nexthdr
== UIP_PROTO_UDP
)
558 lowpan_compress_udp_header(&hc06_ptr
, skb
);
563 skb_pull(skb
, sizeof(struct ipv6hdr
));
564 memcpy(skb_push(skb
, hc06_ptr
- head
), head
, hc06_ptr
- head
);
568 lowpan_raw_dump_table(__func__
, "raw skb data dump", skb
->data
,
572 * NOTE1: I'm still unsure about the fact that compression and WPAN
573 * header are created here and not later in the xmit. So wait for
574 * an opinion of net maintainers.
577 * NOTE2: to be absolutely correct, we must derive PANid information
578 * from MAC subif of the 'dev' and 'real_dev' network devices, but
579 * this isn't implemented in mainline yet, so currently we assign 0xff
582 /* prepare wpan address data */
583 sa
.addr_type
= IEEE802154_ADDR_LONG
;
586 da
.addr_type
= IEEE802154_ADDR_LONG
;
589 memcpy(&(da
.hwaddr
), daddr
, 8);
590 memcpy(&(sa
.hwaddr
), saddr
, 8);
592 mac_cb(skb
)->flags
= IEEE802154_FC_TYPE_DATA
;
594 return dev_hard_header(skb
, lowpan_dev_info(dev
)->real_dev
,
595 type
, (void *)&da
, (void *)&sa
, skb
->len
);
599 static int lowpan_skb_deliver(struct sk_buff
*skb
, struct ipv6hdr
*hdr
)
602 struct lowpan_dev_record
*entry
;
603 int stat
= NET_RX_SUCCESS
;
605 new = skb_copy_expand(skb
, sizeof(struct ipv6hdr
), skb_tailroom(skb
),
612 skb_push(new, sizeof(struct ipv6hdr
));
613 skb_reset_network_header(new);
614 skb_copy_to_linear_data(new, hdr
, sizeof(struct ipv6hdr
));
616 new->protocol
= htons(ETH_P_IPV6
);
617 new->pkt_type
= PACKET_HOST
;
620 list_for_each_entry_rcu(entry
, &lowpan_devices
, list
)
621 if (lowpan_dev_info(entry
->ldev
)->real_dev
== new->dev
) {
622 skb
= skb_copy(new, GFP_ATOMIC
);
628 skb
->dev
= entry
->ldev
;
629 stat
= netif_rx(skb
);
638 static void lowpan_fragment_timer_expired(unsigned long entry_addr
)
640 struct lowpan_fragment
*entry
= (struct lowpan_fragment
*)entry_addr
;
642 pr_debug("%s: timer expired for frame with tag %d\n", __func__
,
645 spin_lock(&flist_lock
);
646 list_del(&entry
->list
);
647 spin_unlock(&flist_lock
);
649 dev_kfree_skb(entry
->skb
);
653 static struct lowpan_fragment
*
654 lowpan_alloc_new_frame(struct sk_buff
*skb
, u8 iphc0
, u8 len
, u8 tag
)
656 struct lowpan_fragment
*frame
;
658 frame
= kzalloc(sizeof(struct lowpan_fragment
),
663 INIT_LIST_HEAD(&frame
->list
);
665 frame
->length
= (iphc0
& 7) | (len
<< 3);
668 /* allocate buffer for frame assembling */
669 frame
->skb
= alloc_skb(frame
->length
+
670 sizeof(struct ipv6hdr
), GFP_ATOMIC
);
675 frame
->skb
->priority
= skb
->priority
;
676 frame
->skb
->dev
= skb
->dev
;
678 /* reserve headroom for uncompressed ipv6 header */
679 skb_reserve(frame
->skb
, sizeof(struct ipv6hdr
));
680 skb_put(frame
->skb
, frame
->length
);
682 init_timer(&frame
->timer
);
683 /* time out is the same as for ipv6 - 60 sec */
684 frame
->timer
.expires
= jiffies
+ LOWPAN_FRAG_TIMEOUT
;
685 frame
->timer
.data
= (unsigned long)frame
;
686 frame
->timer
.function
= lowpan_fragment_timer_expired
;
688 add_timer(&frame
->timer
);
690 list_add_tail(&frame
->list
, &lowpan_fragments
);
701 lowpan_process_data(struct sk_buff
*skb
)
704 u8 tmp
, iphc0
, iphc1
, num_context
= 0;
708 lowpan_raw_dump_table(__func__
, "raw skb data dump", skb
->data
,
710 /* at least two bytes will be used for the encoding */
713 iphc0
= lowpan_fetch_skb_u8(skb
);
715 /* fragments assembling */
716 switch (iphc0
& LOWPAN_DISPATCH_MASK
) {
717 case LOWPAN_DISPATCH_FRAG1
:
718 case LOWPAN_DISPATCH_FRAGN
:
720 struct lowpan_fragment
*frame
;
725 len
= lowpan_fetch_skb_u8(skb
); /* frame length */
726 tag
= lowpan_fetch_skb_u16(skb
);
729 * check if frame assembling with the same tag is
730 * already in progress
732 spin_lock(&flist_lock
);
734 list_for_each_entry(frame
, &lowpan_fragments
, list
)
735 if (frame
->tag
== tag
) {
740 /* alloc new frame structure */
742 frame
= lowpan_alloc_new_frame(skb
, iphc0
, len
, tag
);
744 goto unlock_and_drop
;
747 if ((iphc0
& LOWPAN_DISPATCH_MASK
) == LOWPAN_DISPATCH_FRAG1
)
748 goto unlock_and_drop
;
750 offset
= lowpan_fetch_skb_u8(skb
); /* fetch offset */
752 /* if payload fits buffer, copy it */
753 if (likely((offset
* 8 + skb
->len
) <= frame
->length
))
754 skb_copy_to_linear_data_offset(frame
->skb
, offset
* 8,
755 skb
->data
, skb
->len
);
757 goto unlock_and_drop
;
759 frame
->bytes_rcv
+= skb
->len
;
761 /* frame assembling complete */
762 if ((frame
->bytes_rcv
== frame
->length
) &&
763 frame
->timer
.expires
> jiffies
) {
764 /* if timer haven't expired - first of all delete it */
765 del_timer(&frame
->timer
);
766 list_del(&frame
->list
);
767 spin_unlock(&flist_lock
);
772 iphc0
= lowpan_fetch_skb_u8(skb
);
775 spin_unlock(&flist_lock
);
777 return kfree_skb(skb
), 0;
783 iphc1
= lowpan_fetch_skb_u8(skb
);
785 _saddr
= mac_cb(skb
)->sa
.hwaddr
;
786 _daddr
= mac_cb(skb
)->da
.hwaddr
;
788 pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__
, iphc0
, iphc1
);
790 /* another if the CID flag is set */
791 if (iphc1
& LOWPAN_IPHC_CID
) {
792 pr_debug("(%s): CID flag is set, increase header with one\n",
796 num_context
= lowpan_fetch_skb_u8(skb
);
801 /* Traffic Class and Flow Label */
802 switch ((iphc0
& LOWPAN_IPHC_TF
) >> 3) {
804 * Traffic Class and FLow Label carried in-line
805 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
810 tmp
= lowpan_fetch_skb_u8(skb
);
811 memcpy(&hdr
.flow_lbl
, &skb
->data
[0], 3);
813 hdr
.priority
= ((tmp
>> 2) & 0x0f);
814 hdr
.flow_lbl
[0] = ((tmp
>> 2) & 0x30) | (tmp
<< 6) |
815 (hdr
.flow_lbl
[0] & 0x0f);
818 * Traffic class carried in-line
819 * ECN + DSCP (1 byte), Flow Label is elided
824 tmp
= lowpan_fetch_skb_u8(skb
);
825 hdr
.priority
= ((tmp
>> 2) & 0x0f);
826 hdr
.flow_lbl
[0] = ((tmp
<< 6) & 0xC0) | ((tmp
>> 2) & 0x30);
831 * Flow Label carried in-line
832 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
837 tmp
= lowpan_fetch_skb_u8(skb
);
838 hdr
.flow_lbl
[0] = (skb
->data
[0] & 0x0F) | ((tmp
>> 2) & 0x30);
839 memcpy(&hdr
.flow_lbl
[1], &skb
->data
[0], 2);
842 /* Traffic Class and Flow Label are elided */
854 if ((iphc0
& LOWPAN_IPHC_NH_C
) == 0) {
855 /* Next header is carried inline */
858 hdr
.nexthdr
= lowpan_fetch_skb_u8(skb
);
859 pr_debug("(%s): NH flag is set, next header is carried "
860 "inline: %02x\n", __func__
, hdr
.nexthdr
);
864 if ((iphc0
& 0x03) != LOWPAN_IPHC_TTL_I
)
865 hdr
.hop_limit
= lowpan_ttl_values
[iphc0
& 0x03];
869 hdr
.hop_limit
= lowpan_fetch_skb_u8(skb
);
872 /* Extract SAM to the tmp variable */
873 tmp
= ((iphc1
& LOWPAN_IPHC_SAM
) >> LOWPAN_IPHC_SAM_BIT
) & 0x03;
875 /* Source address uncompression */
876 pr_debug("(%s): source address stateless compression\n", __func__
);
877 err
= lowpan_uncompress_addr(skb
, &hdr
.saddr
, lowpan_llprefix
,
878 lowpan_unc_llconf
[tmp
], skb
->data
);
882 /* Extract DAM to the tmp variable */
883 tmp
= ((iphc1
& LOWPAN_IPHC_DAM_11
) >> LOWPAN_IPHC_DAM_BIT
) & 0x03;
885 /* check for Multicast Compression */
886 if (iphc1
& LOWPAN_IPHC_M
) {
887 if (iphc1
& LOWPAN_IPHC_DAC
) {
888 pr_debug("(%s): destination address context-based "
889 "multicast compression\n", __func__
);
890 /* TODO: implement this */
892 u8 prefix
[] = {0xff, 0x02};
894 pr_debug("(%s): destination address non-context-based"
895 " multicast compression\n", __func__
);
896 if (0 < tmp
&& tmp
< 3) {
900 prefix
[1] = lowpan_fetch_skb_u8(skb
);
903 err
= lowpan_uncompress_addr(skb
, &hdr
.daddr
, prefix
,
904 lowpan_unc_mxconf
[tmp
], NULL
);
909 pr_debug("(%s): destination address stateless compression\n",
911 err
= lowpan_uncompress_addr(skb
, &hdr
.daddr
, lowpan_llprefix
,
912 lowpan_unc_llconf
[tmp
], skb
->data
);
917 /* UDP data uncompression */
918 if (iphc0
& LOWPAN_IPHC_NH_C
)
919 if (lowpan_uncompress_udp_header(skb
))
922 /* Not fragmented package */
923 hdr
.payload_len
= htons(skb
->len
);
925 pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__
,
926 skb_headroom(skb
), skb
->len
);
928 pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
929 "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__
, hdr
.version
,
930 ntohs(hdr
.payload_len
), hdr
.nexthdr
, hdr
.hop_limit
);
932 lowpan_raw_dump_table(__func__
, "raw header dump", (u8
*)&hdr
,
934 return lowpan_skb_deliver(skb
, &hdr
);
937 spin_unlock(&flist_lock
);
943 static int lowpan_get_mac_header_length(struct sk_buff
*skb
)
946 * Currently long addressing mode is supported only, so the overall
948 * FC SeqNum DPAN DA SA Sec
949 * 2 + 1 + 2 + 8 + 8 + 0 = 21
955 lowpan_fragment_xmit(struct sk_buff
*skb
, u8
*head
,
956 int mlen
, int plen
, int offset
)
958 struct sk_buff
*frag
;
961 /* if payload length is zero, therefore it's a first fragment */
962 hlen
= (plen
== 0 ? LOWPAN_FRAG1_HEAD_SIZE
: LOWPAN_FRAGN_HEAD_SIZE
);
964 lowpan_raw_dump_inline(__func__
, "6lowpan fragment header", head
, hlen
);
966 frag
= dev_alloc_skb(hlen
+ mlen
+ plen
+ IEEE802154_MFR_SIZE
);
970 frag
->priority
= skb
->priority
;
971 frag
->dev
= skb
->dev
;
973 /* copy header, MFR and payload */
974 memcpy(skb_put(frag
, mlen
), skb
->data
, mlen
);
975 memcpy(skb_put(frag
, hlen
), head
, hlen
);
978 skb_copy_from_linear_data_offset(skb
, offset
+ mlen
,
979 skb_put(frag
, plen
), plen
);
981 lowpan_raw_dump_table(__func__
, " raw fragment dump", frag
->data
,
984 ret
= dev_queue_xmit(frag
);
990 lowpan_skb_fragmentation(struct sk_buff
*skb
)
992 int err
, header_length
, payload_length
, tag
, offset
= 0;
995 header_length
= lowpan_get_mac_header_length(skb
);
996 payload_length
= skb
->len
- header_length
;
997 tag
= fragment_tag
++;
999 /* first fragment header */
1000 head
[0] = LOWPAN_DISPATCH_FRAG1
| (payload_length
& 0x7);
1001 head
[1] = (payload_length
>> 3) & 0xff;
1002 head
[2] = tag
& 0xff;
1005 err
= lowpan_fragment_xmit(skb
, head
, header_length
, 0, 0);
1007 /* next fragment header */
1008 head
[0] &= ~LOWPAN_DISPATCH_FRAG1
;
1009 head
[0] |= LOWPAN_DISPATCH_FRAGN
;
1011 while ((payload_length
- offset
> 0) && (err
>= 0)) {
1012 int len
= LOWPAN_FRAG_SIZE
;
1014 head
[4] = offset
/ 8;
1016 if (payload_length
- offset
< len
)
1017 len
= payload_length
- offset
;
1019 err
= lowpan_fragment_xmit(skb
, head
, header_length
,
1027 static netdev_tx_t
lowpan_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1031 pr_debug("(%s): package xmit\n", __func__
);
1033 skb
->dev
= lowpan_dev_info(dev
)->real_dev
;
1034 if (skb
->dev
== NULL
) {
1035 pr_debug("(%s) ERROR: no real wpan device found\n", __func__
);
1039 if (skb
->len
<= IEEE802154_MTU
) {
1040 err
= dev_queue_xmit(skb
);
1044 pr_debug("(%s): frame is too big, fragmentation is needed\n",
1046 err
= lowpan_skb_fragmentation(skb
);
1051 pr_debug("(%s): ERROR: xmit failed\n", __func__
);
1053 return (err
< 0 ? NETDEV_TX_BUSY
: NETDEV_TX_OK
);
1056 static void lowpan_dev_free(struct net_device
*dev
)
1058 dev_put(lowpan_dev_info(dev
)->real_dev
);
1062 static struct wpan_phy
*lowpan_get_phy(const struct net_device
*dev
)
1064 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1065 return ieee802154_mlme_ops(real_dev
)->get_phy(real_dev
);
1068 static u16
lowpan_get_pan_id(const struct net_device
*dev
)
1070 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1071 return ieee802154_mlme_ops(real_dev
)->get_pan_id(real_dev
);
1074 static u16
lowpan_get_short_addr(const struct net_device
*dev
)
1076 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1077 return ieee802154_mlme_ops(real_dev
)->get_short_addr(real_dev
);
1080 static struct header_ops lowpan_header_ops
= {
1081 .create
= lowpan_header_create
,
1084 static const struct net_device_ops lowpan_netdev_ops
= {
1085 .ndo_start_xmit
= lowpan_xmit
,
1086 .ndo_set_mac_address
= eth_mac_addr
,
1089 static struct ieee802154_mlme_ops lowpan_mlme
= {
1090 .get_pan_id
= lowpan_get_pan_id
,
1091 .get_phy
= lowpan_get_phy
,
1092 .get_short_addr
= lowpan_get_short_addr
,
1095 static void lowpan_setup(struct net_device
*dev
)
1097 pr_debug("(%s)\n", __func__
);
1099 dev
->addr_len
= IEEE802154_ADDR_LEN
;
1100 memset(dev
->broadcast
, 0xff, IEEE802154_ADDR_LEN
);
1101 dev
->type
= ARPHRD_IEEE802154
;
1102 /* Frame Control + Sequence Number + Address fields + Security Header */
1103 dev
->hard_header_len
= 2 + 1 + 20 + 14;
1104 dev
->needed_tailroom
= 2; /* FCS */
1106 dev
->tx_queue_len
= 0;
1107 dev
->flags
= IFF_BROADCAST
| IFF_MULTICAST
;
1108 dev
->watchdog_timeo
= 0;
1110 dev
->netdev_ops
= &lowpan_netdev_ops
;
1111 dev
->header_ops
= &lowpan_header_ops
;
1112 dev
->ml_priv
= &lowpan_mlme
;
1113 dev
->destructor
= lowpan_dev_free
;
1116 static int lowpan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1118 pr_debug("(%s)\n", __func__
);
1120 if (tb
[IFLA_ADDRESS
]) {
1121 if (nla_len(tb
[IFLA_ADDRESS
]) != IEEE802154_ADDR_LEN
)
1127 static int lowpan_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1128 struct packet_type
*pt
, struct net_device
*orig_dev
)
1130 if (!netif_running(dev
))
1133 if (dev
->type
!= ARPHRD_IEEE802154
)
1136 /* check that it's our buffer */
1137 switch (skb
->data
[0] & 0xe0) {
1138 case LOWPAN_DISPATCH_IPHC
: /* ipv6 datagram */
1139 case LOWPAN_DISPATCH_FRAG1
: /* first fragment header */
1140 case LOWPAN_DISPATCH_FRAGN
: /* next fragments headers */
1141 lowpan_process_data(skb
);
1147 return NET_RX_SUCCESS
;
1154 static int lowpan_newlink(struct net
*src_net
, struct net_device
*dev
,
1155 struct nlattr
*tb
[], struct nlattr
*data
[])
1157 struct net_device
*real_dev
;
1158 struct lowpan_dev_record
*entry
;
1160 pr_debug("(%s)\n", __func__
);
1164 /* find and hold real wpan device */
1165 real_dev
= dev_get_by_index(src_net
, nla_get_u32(tb
[IFLA_LINK
]));
1169 lowpan_dev_info(dev
)->real_dev
= real_dev
;
1170 mutex_init(&lowpan_dev_info(dev
)->dev_list_mtx
);
1172 entry
= kzalloc(sizeof(struct lowpan_dev_record
), GFP_KERNEL
);
1175 lowpan_dev_info(dev
)->real_dev
= NULL
;
1181 mutex_lock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1182 INIT_LIST_HEAD(&entry
->list
);
1183 list_add_tail(&entry
->list
, &lowpan_devices
);
1184 mutex_unlock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1186 spin_lock_init(&flist_lock
);
1188 register_netdevice(dev
);
1193 static void lowpan_dellink(struct net_device
*dev
, struct list_head
*head
)
1195 struct lowpan_dev_info
*lowpan_dev
= lowpan_dev_info(dev
);
1196 struct net_device
*real_dev
= lowpan_dev
->real_dev
;
1197 struct lowpan_dev_record
*entry
, *tmp
;
1198 struct lowpan_fragment
*frame
, *tframe
;
1202 spin_lock(&flist_lock
);
1203 list_for_each_entry_safe(frame
, tframe
, &lowpan_fragments
, list
) {
1204 del_timer(&frame
->timer
);
1205 list_del(&frame
->list
);
1206 dev_kfree_skb(frame
->skb
);
1209 spin_unlock(&flist_lock
);
1211 mutex_lock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1212 list_for_each_entry_safe(entry
, tmp
, &lowpan_devices
, list
) {
1213 if (entry
->ldev
== dev
) {
1214 list_del(&entry
->list
);
1218 mutex_unlock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1220 mutex_destroy(&lowpan_dev_info(dev
)->dev_list_mtx
);
1222 unregister_netdevice_queue(dev
, head
);
1227 static struct rtnl_link_ops lowpan_link_ops __read_mostly
= {
1229 .priv_size
= sizeof(struct lowpan_dev_info
),
1230 .setup
= lowpan_setup
,
1231 .newlink
= lowpan_newlink
,
1232 .dellink
= lowpan_dellink
,
1233 .validate
= lowpan_validate
,
1236 static inline int __init
lowpan_netlink_init(void)
1238 return rtnl_link_register(&lowpan_link_ops
);
1241 static inline void __init
lowpan_netlink_fini(void)
1243 rtnl_link_unregister(&lowpan_link_ops
);
1246 static struct packet_type lowpan_packet_type
= {
1247 .type
= __constant_htons(ETH_P_IEEE802154
),
1251 static int __init
lowpan_init_module(void)
1255 pr_debug("(%s)\n", __func__
);
1257 err
= lowpan_netlink_init();
1261 dev_add_pack(&lowpan_packet_type
);
1266 static void __exit
lowpan_cleanup_module(void)
1268 pr_debug("(%s)\n", __func__
);
1270 lowpan_netlink_fini();
1272 dev_remove_pack(&lowpan_packet_type
);
1275 module_init(lowpan_init_module
);
1276 module_exit(lowpan_cleanup_module
);
1277 MODULE_LICENSE("GPL");
1278 MODULE_ALIAS_RTNL_LINK("lowpan");