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
);
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
77 * NOTE: => the uncompress function does change 0xf to 0x10
78 * NOTE: 0x00 => no-autoconfig => unspecified
80 static const u8 lowpan_unc_llconf
[] = {0x0f, 0x28, 0x22, 0x20};
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
89 static const u8 lowpan_unc_ctxconf
[] = {0x00, 0x88, 0x82, 0x80};
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
98 static const u8 lowpan_unc_mxconf
[] = {0x0f, 0x25, 0x23, 0x21};
100 /* Link local prefix */
101 static const u8 lowpan_llprefix
[] = {0xfe, 0x80};
103 /* private device info */
104 struct lowpan_dev_info
{
105 struct net_device
*real_dev
; /* real WPAN device ptr */
106 struct mutex dev_list_mtx
; /* mutex for list ops */
109 struct lowpan_dev_record
{
110 struct net_device
*ldev
;
111 struct list_head list
;
114 struct lowpan_fragment
{
115 struct sk_buff
*skb
; /* skb to be assembled */
116 u16 length
; /* length to be assemled */
117 u32 bytes_rcv
; /* bytes received */
118 u16 tag
; /* current fragment tag */
119 struct timer_list timer
; /* assembling timer */
120 struct list_head list
; /* fragments list */
123 static unsigned short fragment_tag
;
124 static LIST_HEAD(lowpan_fragments
);
125 static DEFINE_SPINLOCK(flist_lock
);
128 lowpan_dev_info
*lowpan_dev_info(const struct net_device
*dev
)
130 return netdev_priv(dev
);
133 static inline void lowpan_address_flip(u8
*src
, u8
*dest
)
136 for (i
= 0; i
< IEEE802154_ADDR_LEN
; i
++)
137 (dest
)[IEEE802154_ADDR_LEN
- i
- 1] = (src
)[i
];
140 /* list of all 6lowpan devices, uses for package delivering */
141 /* print data in line */
142 static inline void lowpan_raw_dump_inline(const char *caller
, char *msg
,
143 unsigned char *buf
, int len
)
147 pr_debug("(%s) %s: ", caller
, msg
);
148 print_hex_dump(KERN_DEBUG
, "", DUMP_PREFIX_NONE
,
149 16, 1, buf
, len
, false);
154 * print data in a table format:
156 * addr: xx xx xx xx xx xx
157 * addr: xx xx xx xx xx xx
160 static inline void lowpan_raw_dump_table(const char *caller
, char *msg
,
161 unsigned char *buf
, int len
)
165 pr_debug("(%s) %s:\n", caller
, msg
);
166 print_hex_dump(KERN_DEBUG
, "\t", DUMP_PREFIX_OFFSET
,
167 16, 1, buf
, len
, false);
172 lowpan_compress_addr_64(u8
**hc06_ptr
, u8 shift
, const struct in6_addr
*ipaddr
,
173 const unsigned char *lladdr
)
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);
183 val
= 2; /* 16-bits */
185 /* do not compress IID => xxxx::IID */
186 memcpy(*hc06_ptr
, &ipaddr
->s6_addr16
[4], 8);
188 val
= 1; /* 64-bits */
191 return rol8(val
, shift
);
195 lowpan_uip_ds6_set_addr_iid(struct in6_addr
*ipaddr
, unsigned char *lladdr
)
197 memcpy(&ipaddr
->s6_addr
[8], lladdr
, IEEE802154_ADDR_LEN
);
198 /* second bit-flip (Universe/Local) is done according RFC2464 */
199 ipaddr
->s6_addr
[8] ^= 0x02;
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).
210 lowpan_uncompress_addr(struct sk_buff
*skb
, struct in6_addr
*ipaddr
,
211 u8
const *prefix
, u8 pref_post_count
, unsigned char *lladdr
)
213 u8 prefcount
= pref_post_count
>> 4;
214 u8 postcount
= pref_post_count
& 0x0f;
216 /* full nibble 15 => 16 */
217 prefcount
= (prefcount
== 15 ? 16 : prefcount
);
218 postcount
= (postcount
== 15 ? 16 : postcount
);
221 lowpan_raw_dump_inline(__func__
, "linklocal address",
222 lladdr
, IEEE802154_ADDR_LEN
);
224 memcpy(ipaddr
, prefix
, prefcount
);
226 if (prefcount
+ postcount
< 16)
227 memset(&ipaddr
->s6_addr
[prefcount
], 0,
228 16 - (prefcount
+ postcount
));
231 memcpy(&ipaddr
->s6_addr
[16 - postcount
], skb
->data
, postcount
);
232 skb_pull(skb
, postcount
);
233 } else if (prefcount
> 0) {
237 /* no IID based configuration if no prefix and no data */
238 lowpan_uip_ds6_set_addr_iid(ipaddr
, lladdr
);
241 pr_debug("uncompressing %d + %d => ", prefcount
, postcount
);
242 lowpan_raw_dump_inline(NULL
, NULL
, ipaddr
->s6_addr
, 16);
248 lowpan_compress_udp_header(u8
**hc06_ptr
, struct sk_buff
*skb
)
250 struct udphdr
*uh
= udp_hdr(skb
);
252 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
)) {
256 pr_debug("UDP header: both ports compression to 4 bits\n");
257 **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));
262 } else if ((uh
->dest
& LOWPAN_NHC_UDP_8BIT_MASK
) ==
263 LOWPAN_NHC_UDP_8BIT_PORT
) {
264 pr_debug("UDP header: remove 8 bits of dest\n");
265 **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
);
269 } else if ((uh
->source
& LOWPAN_NHC_UDP_8BIT_MASK
) ==
270 LOWPAN_NHC_UDP_8BIT_PORT
) {
271 pr_debug("UDP header: remove 8 bits of source\n");
272 **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
);
277 pr_debug("UDP header: can't compress\n");
278 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_00
;
279 memcpy(*hc06_ptr
+ 1, &uh
->source
, 2);
280 memcpy(*hc06_ptr
+ 3, &uh
->dest
, 2);
284 /* checksum is always inline */
285 memcpy(*hc06_ptr
, &uh
->check
, 2);
289 static inline int lowpan_fetch_skb_u8(struct sk_buff
*skb
, u8
*val
)
291 if (unlikely(!pskb_may_pull(skb
, 1)))
300 static inline int lowpan_fetch_skb_u16(struct sk_buff
*skb
, u16
*val
)
302 if (unlikely(!pskb_may_pull(skb
, 2)))
305 *val
= (skb
->data
[0] << 8) | skb
->data
[1];
312 lowpan_uncompress_udp_header(struct sk_buff
*skb
)
314 struct udphdr
*uh
= udp_hdr(skb
);
320 if (lowpan_fetch_skb_u8(skb
, &tmp
))
323 if ((tmp
& LOWPAN_NHC_UDP_MASK
) == LOWPAN_NHC_UDP_ID
) {
324 pr_debug("UDP header uncompression\n");
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("ERROR: unknown UDP format\n");
355 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
356 uh
->source
, uh
->dest
);
359 memcpy(&uh
->check
, &skb
->data
[0], 2);
362 pr_debug("ERROR: unsupported NH format\n");
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
;
384 * if this package isn't ipv6 one, where should it be routed?
386 if (type
!= ETH_P_IPV6
)
392 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
393 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr
->version
,
394 ntohs(hdr
->payload_len
), hdr
->nexthdr
, hdr
->hop_limit
);
396 lowpan_raw_dump_table(__func__
, "raw skb network header dump",
397 skb_network_header(skb
), sizeof(struct ipv6hdr
));
400 saddr
= dev
->dev_addr
;
402 lowpan_raw_dump_inline(__func__
, "saddr", (unsigned char *)saddr
, 8);
405 * As we copy some bit-length fields, in the IPHC encoding bytes,
406 * we sometimes use |=
407 * If the field is 0, and the current bit value in memory is 1,
408 * this does not work. We therefore reset the IPHC encoding here
410 iphc0
= LOWPAN_DISPATCH_IPHC
;
413 /* TODO: context lookup */
415 lowpan_raw_dump_inline(__func__
, "daddr", (unsigned char *)daddr
, 8);
418 * Traffic class, flow label
419 * If flow label is 0, compress it. If traffic class is 0, compress it
420 * We have to process both in the same time as the offset of traffic
421 * class depends on the presence of version and flow label
424 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
425 tmp
= (hdr
->priority
<< 4) | (hdr
->flow_lbl
[0] >> 4);
426 tmp
= ((tmp
& 0x03) << 6) | (tmp
>> 2);
428 if (((hdr
->flow_lbl
[0] & 0x0F) == 0) &&
429 (hdr
->flow_lbl
[1] == 0) && (hdr
->flow_lbl
[2] == 0)) {
430 /* flow label can be compressed */
431 iphc0
|= LOWPAN_IPHC_FL_C
;
432 if ((hdr
->priority
== 0) &&
433 ((hdr
->flow_lbl
[0] & 0xF0) == 0)) {
434 /* compress (elide) all */
435 iphc0
|= LOWPAN_IPHC_TC_C
;
437 /* compress only the flow label */
442 /* Flow label cannot be compressed */
443 if ((hdr
->priority
== 0) &&
444 ((hdr
->flow_lbl
[0] & 0xF0) == 0)) {
445 /* compress only traffic class */
446 iphc0
|= LOWPAN_IPHC_TC_C
;
447 *hc06_ptr
= (tmp
& 0xc0) | (hdr
->flow_lbl
[0] & 0x0F);
448 memcpy(hc06_ptr
+ 1, &hdr
->flow_lbl
[1], 2);
451 /* compress nothing */
452 memcpy(hc06_ptr
, &hdr
, 4);
453 /* replace the top byte with new ECN | DSCP format */
459 /* NOTE: payload length is always compressed */
461 /* Next Header is compress if UDP */
462 if (hdr
->nexthdr
== UIP_PROTO_UDP
)
463 iphc0
|= LOWPAN_IPHC_NH_C
;
465 if ((iphc0
& LOWPAN_IPHC_NH_C
) == 0) {
466 *hc06_ptr
= hdr
->nexthdr
;
472 * if 1: compress, encoding is 01
473 * if 64: compress, encoding is 10
474 * if 255: compress, encoding is 11
475 * else do not compress
477 switch (hdr
->hop_limit
) {
479 iphc0
|= LOWPAN_IPHC_TTL_1
;
482 iphc0
|= LOWPAN_IPHC_TTL_64
;
485 iphc0
|= LOWPAN_IPHC_TTL_255
;
488 *hc06_ptr
= hdr
->hop_limit
;
493 /* source address compression */
494 if (is_addr_unspecified(&hdr
->saddr
)) {
495 pr_debug("source address is unspecified, setting SAC\n");
496 iphc1
|= LOWPAN_IPHC_SAC
;
497 /* TODO: context lookup */
498 } else if (is_addr_link_local(&hdr
->saddr
)) {
499 pr_debug("source address is link-local\n");
500 iphc1
|= lowpan_compress_addr_64(&hc06_ptr
,
501 LOWPAN_IPHC_SAM_BIT
, &hdr
->saddr
, saddr
);
503 pr_debug("send the full source address\n");
504 memcpy(hc06_ptr
, &hdr
->saddr
.s6_addr16
[0], 16);
508 /* destination address compression */
509 if (is_addr_mcast(&hdr
->daddr
)) {
510 pr_debug("destination address is multicast: ");
511 iphc1
|= LOWPAN_IPHC_M
;
512 if (lowpan_is_mcast_addr_compressable8(&hdr
->daddr
)) {
513 pr_debug("compressed to 1 octet\n");
514 iphc1
|= LOWPAN_IPHC_DAM_11
;
516 *hc06_ptr
= hdr
->daddr
.s6_addr
[15];
518 } else if (lowpan_is_mcast_addr_compressable32(&hdr
->daddr
)) {
519 pr_debug("compressed to 4 octets\n");
520 iphc1
|= LOWPAN_IPHC_DAM_10
;
521 /* second byte + the last three */
522 *hc06_ptr
= hdr
->daddr
.s6_addr
[1];
523 memcpy(hc06_ptr
+ 1, &hdr
->daddr
.s6_addr
[13], 3);
525 } else if (lowpan_is_mcast_addr_compressable48(&hdr
->daddr
)) {
526 pr_debug("compressed to 6 octets\n");
527 iphc1
|= LOWPAN_IPHC_DAM_01
;
528 /* second byte + the last five */
529 *hc06_ptr
= hdr
->daddr
.s6_addr
[1];
530 memcpy(hc06_ptr
+ 1, &hdr
->daddr
.s6_addr
[11], 5);
533 pr_debug("using full address\n");
534 iphc1
|= LOWPAN_IPHC_DAM_00
;
535 memcpy(hc06_ptr
, &hdr
->daddr
.s6_addr
[0], 16);
539 /* TODO: context lookup */
540 if (is_addr_link_local(&hdr
->daddr
)) {
541 pr_debug("dest address is unicast and link-local\n");
542 iphc1
|= lowpan_compress_addr_64(&hc06_ptr
,
543 LOWPAN_IPHC_DAM_BIT
, &hdr
->daddr
, daddr
);
545 pr_debug("dest address is unicast: using full one\n");
546 memcpy(hc06_ptr
, &hdr
->daddr
.s6_addr16
[0], 16);
551 /* UDP header compression */
552 if (hdr
->nexthdr
== UIP_PROTO_UDP
)
553 lowpan_compress_udp_header(&hc06_ptr
, skb
);
558 skb_pull(skb
, sizeof(struct ipv6hdr
));
559 memcpy(skb_push(skb
, hc06_ptr
- head
), head
, hc06_ptr
- head
);
561 lowpan_raw_dump_table(__func__
, "raw skb data dump", skb
->data
,
565 * NOTE1: I'm still unsure about the fact that compression and WPAN
566 * header are created here and not later in the xmit. So wait for
567 * an opinion of net maintainers.
570 * NOTE2: to be absolutely correct, we must derive PANid information
571 * from MAC subif of the 'dev' and 'real_dev' network devices, but
572 * this isn't implemented in mainline yet, so currently we assign 0xff
575 /* prepare wpan address data */
576 sa
.addr_type
= IEEE802154_ADDR_LONG
;
579 da
.addr_type
= IEEE802154_ADDR_LONG
;
582 memcpy(&(da
.hwaddr
), daddr
, 8);
583 memcpy(&(sa
.hwaddr
), saddr
, 8);
585 mac_cb(skb
)->flags
= IEEE802154_FC_TYPE_DATA
;
587 return dev_hard_header(skb
, lowpan_dev_info(dev
)->real_dev
,
588 type
, (void *)&da
, (void *)&sa
, skb
->len
);
592 static int lowpan_give_skb_to_devices(struct sk_buff
*skb
)
594 struct lowpan_dev_record
*entry
;
595 struct sk_buff
*skb_cp
;
596 int stat
= NET_RX_SUCCESS
;
599 list_for_each_entry_rcu(entry
, &lowpan_devices
, list
)
600 if (lowpan_dev_info(entry
->ldev
)->real_dev
== skb
->dev
) {
601 skb_cp
= skb_copy(skb
, GFP_ATOMIC
);
607 skb_cp
->dev
= entry
->ldev
;
608 stat
= netif_rx(skb_cp
);
615 static int lowpan_skb_deliver(struct sk_buff
*skb
, struct ipv6hdr
*hdr
)
618 int stat
= NET_RX_SUCCESS
;
620 new = skb_copy_expand(skb
, sizeof(struct ipv6hdr
), skb_tailroom(skb
),
627 skb_push(new, sizeof(struct ipv6hdr
));
628 skb_reset_network_header(new);
629 skb_copy_to_linear_data(new, hdr
, sizeof(struct ipv6hdr
));
631 new->protocol
= htons(ETH_P_IPV6
);
632 new->pkt_type
= PACKET_HOST
;
634 stat
= lowpan_give_skb_to_devices(new);
641 static void lowpan_fragment_timer_expired(unsigned long entry_addr
)
643 struct lowpan_fragment
*entry
= (struct lowpan_fragment
*)entry_addr
;
645 pr_debug("timer expired for frame with tag %d\n", entry
->tag
);
647 list_del(&entry
->list
);
648 dev_kfree_skb(entry
->skb
);
652 static struct lowpan_fragment
*
653 lowpan_alloc_new_frame(struct sk_buff
*skb
, u8 len
, u16 tag
)
655 struct lowpan_fragment
*frame
;
657 frame
= kzalloc(sizeof(struct lowpan_fragment
),
662 INIT_LIST_HEAD(&frame
->list
);
667 /* allocate buffer for frame assembling */
668 frame
->skb
= netdev_alloc_skb_ip_align(skb
->dev
, frame
->length
+
669 sizeof(struct ipv6hdr
));
674 frame
->skb
->priority
= skb
->priority
;
675 frame
->skb
->dev
= skb
->dev
;
677 /* reserve headroom for uncompressed ipv6 header */
678 skb_reserve(frame
->skb
, sizeof(struct ipv6hdr
));
679 skb_put(frame
->skb
, frame
->length
);
681 init_timer(&frame
->timer
);
682 /* time out is the same as for ipv6 - 60 sec */
683 frame
->timer
.expires
= jiffies
+ LOWPAN_FRAG_TIMEOUT
;
684 frame
->timer
.data
= (unsigned long)frame
;
685 frame
->timer
.function
= lowpan_fragment_timer_expired
;
687 add_timer(&frame
->timer
);
689 list_add_tail(&frame
->list
, &lowpan_fragments
);
700 lowpan_process_data(struct sk_buff
*skb
)
703 u8 tmp
, iphc0
, iphc1
, num_context
= 0;
707 lowpan_raw_dump_table(__func__
, "raw skb data dump", skb
->data
,
709 /* at least two bytes will be used for the encoding */
713 if (lowpan_fetch_skb_u8(skb
, &iphc0
))
716 /* fragments assembling */
717 switch (iphc0
& LOWPAN_DISPATCH_MASK
) {
718 case LOWPAN_DISPATCH_FRAG1
:
719 case LOWPAN_DISPATCH_FRAGN
:
721 struct lowpan_fragment
*frame
;
722 /* slen stores the rightmost 8 bits of the 11 bits length */
727 if (lowpan_fetch_skb_u8(skb
, &slen
) || /* frame length */
728 lowpan_fetch_skb_u16(skb
, &tag
)) /* fragment tag */
731 /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
732 len
= ((iphc0
& 7) << 8) | slen
;
735 * check if frame assembling with the same tag is
736 * already in progress
738 spin_lock_bh(&flist_lock
);
740 list_for_each_entry(frame
, &lowpan_fragments
, list
)
741 if (frame
->tag
== tag
) {
746 /* alloc new frame structure */
748 frame
= lowpan_alloc_new_frame(skb
, len
, tag
);
750 goto unlock_and_drop
;
753 if ((iphc0
& LOWPAN_DISPATCH_MASK
) == LOWPAN_DISPATCH_FRAG1
)
754 goto unlock_and_drop
;
756 if (lowpan_fetch_skb_u8(skb
, &offset
)) /* fetch offset */
757 goto unlock_and_drop
;
759 /* if payload fits buffer, copy it */
760 if (likely((offset
* 8 + skb
->len
) <= frame
->length
))
761 skb_copy_to_linear_data_offset(frame
->skb
, offset
* 8,
762 skb
->data
, skb
->len
);
764 goto unlock_and_drop
;
766 frame
->bytes_rcv
+= skb
->len
;
768 /* frame assembling complete */
769 if ((frame
->bytes_rcv
== frame
->length
) &&
770 frame
->timer
.expires
> jiffies
) {
771 /* if timer haven't expired - first of all delete it */
772 del_timer_sync(&frame
->timer
);
773 list_del(&frame
->list
);
774 spin_unlock_bh(&flist_lock
);
780 if (lowpan_fetch_skb_u8(skb
, &iphc0
))
785 spin_unlock_bh(&flist_lock
);
787 return kfree_skb(skb
), 0;
793 if (lowpan_fetch_skb_u8(skb
, &iphc1
))
796 _saddr
= mac_cb(skb
)->sa
.hwaddr
;
797 _daddr
= mac_cb(skb
)->da
.hwaddr
;
799 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0
, iphc1
);
801 /* another if the CID flag is set */
802 if (iphc1
& LOWPAN_IPHC_CID
) {
803 pr_debug("CID flag is set, increase header with one\n");
804 if (lowpan_fetch_skb_u8(skb
, &num_context
))
810 /* Traffic Class and Flow Label */
811 switch ((iphc0
& LOWPAN_IPHC_TF
) >> 3) {
813 * Traffic Class and FLow Label carried in-line
814 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
817 if (lowpan_fetch_skb_u8(skb
, &tmp
))
820 memcpy(&hdr
.flow_lbl
, &skb
->data
[0], 3);
822 hdr
.priority
= ((tmp
>> 2) & 0x0f);
823 hdr
.flow_lbl
[0] = ((tmp
>> 2) & 0x30) | (tmp
<< 6) |
824 (hdr
.flow_lbl
[0] & 0x0f);
827 * Traffic class carried in-line
828 * ECN + DSCP (1 byte), Flow Label is elided
831 if (lowpan_fetch_skb_u8(skb
, &tmp
))
834 hdr
.priority
= ((tmp
>> 2) & 0x0f);
835 hdr
.flow_lbl
[0] = ((tmp
<< 6) & 0xC0) | ((tmp
>> 2) & 0x30);
840 * Flow Label carried in-line
841 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
844 if (lowpan_fetch_skb_u8(skb
, &tmp
))
847 hdr
.flow_lbl
[0] = (skb
->data
[0] & 0x0F) | ((tmp
>> 2) & 0x30);
848 memcpy(&hdr
.flow_lbl
[1], &skb
->data
[0], 2);
851 /* Traffic Class and Flow Label are elided */
863 if ((iphc0
& LOWPAN_IPHC_NH_C
) == 0) {
864 /* Next header is carried inline */
865 if (lowpan_fetch_skb_u8(skb
, &(hdr
.nexthdr
)))
868 pr_debug("NH flag is set, next header carried inline: %02x\n",
873 if ((iphc0
& 0x03) != LOWPAN_IPHC_TTL_I
)
874 hdr
.hop_limit
= lowpan_ttl_values
[iphc0
& 0x03];
876 if (lowpan_fetch_skb_u8(skb
, &(hdr
.hop_limit
)))
880 /* Extract SAM to the tmp variable */
881 tmp
= ((iphc1
& LOWPAN_IPHC_SAM
) >> LOWPAN_IPHC_SAM_BIT
) & 0x03;
883 /* Source address uncompression */
884 pr_debug("source address stateless compression\n");
885 err
= lowpan_uncompress_addr(skb
, &hdr
.saddr
, lowpan_llprefix
,
886 lowpan_unc_llconf
[tmp
], skb
->data
);
890 /* Extract DAM to the tmp variable */
891 tmp
= ((iphc1
& LOWPAN_IPHC_DAM_11
) >> LOWPAN_IPHC_DAM_BIT
) & 0x03;
893 /* check for Multicast Compression */
894 if (iphc1
& LOWPAN_IPHC_M
) {
895 if (iphc1
& LOWPAN_IPHC_DAC
) {
896 pr_debug("dest: context-based mcast compression\n");
897 /* TODO: implement this */
899 u8 prefix
[] = {0xff, 0x02};
901 pr_debug("dest: non context-based mcast compression\n");
902 if (0 < tmp
&& tmp
< 3) {
903 if (lowpan_fetch_skb_u8(skb
, &prefix
[1]))
907 err
= lowpan_uncompress_addr(skb
, &hdr
.daddr
, prefix
,
908 lowpan_unc_mxconf
[tmp
], NULL
);
913 pr_debug("dest: stateless compression\n");
914 err
= lowpan_uncompress_addr(skb
, &hdr
.daddr
, lowpan_llprefix
,
915 lowpan_unc_llconf
[tmp
], skb
->data
);
920 /* UDP data uncompression */
921 if (iphc0
& LOWPAN_IPHC_NH_C
)
922 if (lowpan_uncompress_udp_header(skb
))
925 /* Not fragmented package */
926 hdr
.payload_len
= htons(skb
->len
);
928 pr_debug("skb headroom size = %d, data length = %d\n",
929 skb_headroom(skb
), skb
->len
);
931 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
932 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr
.version
,
933 ntohs(hdr
.payload_len
), hdr
.nexthdr
, hdr
.hop_limit
);
935 lowpan_raw_dump_table(__func__
, "raw header dump", (u8
*)&hdr
,
937 return lowpan_skb_deliver(skb
, &hdr
);
940 spin_unlock_bh(&flist_lock
);
946 static int lowpan_set_address(struct net_device
*dev
, void *p
)
948 struct sockaddr
*sa
= p
;
950 if (netif_running(dev
))
953 /* TODO: validate addr */
954 memcpy(dev
->dev_addr
, sa
->sa_data
, dev
->addr_len
);
959 static int lowpan_get_mac_header_length(struct sk_buff
*skb
)
962 * Currently long addressing mode is supported only, so the overall
964 * FC SeqNum DPAN DA SA Sec
965 * 2 + 1 + 2 + 8 + 8 + 0 = 21
971 lowpan_fragment_xmit(struct sk_buff
*skb
, u8
*head
,
972 int mlen
, int plen
, int offset
)
974 struct sk_buff
*frag
;
977 /* if payload length is zero, therefore it's a first fragment */
978 hlen
= (plen
== 0 ? LOWPAN_FRAG1_HEAD_SIZE
: LOWPAN_FRAGN_HEAD_SIZE
);
980 lowpan_raw_dump_inline(__func__
, "6lowpan fragment header", head
, hlen
);
982 frag
= dev_alloc_skb(hlen
+ mlen
+ plen
+ IEEE802154_MFR_SIZE
);
986 frag
->priority
= skb
->priority
;
987 frag
->dev
= skb
->dev
;
989 /* copy header, MFR and payload */
990 memcpy(skb_put(frag
, mlen
), skb
->data
, mlen
);
991 memcpy(skb_put(frag
, hlen
), head
, hlen
);
994 skb_copy_from_linear_data_offset(skb
, offset
+ mlen
,
995 skb_put(frag
, plen
), plen
);
997 lowpan_raw_dump_table(__func__
, " raw fragment dump", frag
->data
,
1000 ret
= dev_queue_xmit(frag
);
1006 lowpan_skb_fragmentation(struct sk_buff
*skb
)
1008 int err
, header_length
, payload_length
, tag
, offset
= 0;
1011 header_length
= lowpan_get_mac_header_length(skb
);
1012 payload_length
= skb
->len
- header_length
;
1013 tag
= fragment_tag
++;
1015 /* first fragment header */
1016 head
[0] = LOWPAN_DISPATCH_FRAG1
| ((payload_length
>> 8) & 0x7);
1017 head
[1] = payload_length
& 0xff;
1019 head
[3] = tag
& 0xff;
1021 err
= lowpan_fragment_xmit(skb
, head
, header_length
, 0, 0);
1023 /* next fragment header */
1024 head
[0] &= ~LOWPAN_DISPATCH_FRAG1
;
1025 head
[0] |= LOWPAN_DISPATCH_FRAGN
;
1027 while ((payload_length
- offset
> 0) && (err
>= 0)) {
1028 int len
= LOWPAN_FRAG_SIZE
;
1030 head
[4] = offset
/ 8;
1032 if (payload_length
- offset
< len
)
1033 len
= payload_length
- offset
;
1035 err
= lowpan_fragment_xmit(skb
, head
, header_length
,
1043 static netdev_tx_t
lowpan_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1047 pr_debug("package xmit\n");
1049 skb
->dev
= lowpan_dev_info(dev
)->real_dev
;
1050 if (skb
->dev
== NULL
) {
1051 pr_debug("ERROR: no real wpan device found\n");
1055 /* Send directly if less than the MTU minus the 2 checksum bytes. */
1056 if (skb
->len
<= IEEE802154_MTU
- IEEE802154_MFR_SIZE
) {
1057 err
= dev_queue_xmit(skb
);
1061 pr_debug("frame is too big, fragmentation is needed\n");
1062 err
= lowpan_skb_fragmentation(skb
);
1067 pr_debug("ERROR: xmit failed\n");
1069 return (err
< 0 ? NETDEV_TX_BUSY
: NETDEV_TX_OK
);
1072 static struct wpan_phy
*lowpan_get_phy(const struct net_device
*dev
)
1074 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1075 return ieee802154_mlme_ops(real_dev
)->get_phy(real_dev
);
1078 static u16
lowpan_get_pan_id(const struct net_device
*dev
)
1080 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1081 return ieee802154_mlme_ops(real_dev
)->get_pan_id(real_dev
);
1084 static u16
lowpan_get_short_addr(const struct net_device
*dev
)
1086 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1087 return ieee802154_mlme_ops(real_dev
)->get_short_addr(real_dev
);
1090 static struct header_ops lowpan_header_ops
= {
1091 .create
= lowpan_header_create
,
1094 static const struct net_device_ops lowpan_netdev_ops
= {
1095 .ndo_start_xmit
= lowpan_xmit
,
1096 .ndo_set_mac_address
= lowpan_set_address
,
1099 static struct ieee802154_mlme_ops lowpan_mlme
= {
1100 .get_pan_id
= lowpan_get_pan_id
,
1101 .get_phy
= lowpan_get_phy
,
1102 .get_short_addr
= lowpan_get_short_addr
,
1105 static void lowpan_setup(struct net_device
*dev
)
1107 dev
->addr_len
= IEEE802154_ADDR_LEN
;
1108 memset(dev
->broadcast
, 0xff, IEEE802154_ADDR_LEN
);
1109 dev
->type
= ARPHRD_IEEE802154
;
1110 /* Frame Control + Sequence Number + Address fields + Security Header */
1111 dev
->hard_header_len
= 2 + 1 + 20 + 14;
1112 dev
->needed_tailroom
= 2; /* FCS */
1114 dev
->tx_queue_len
= 0;
1115 dev
->flags
= IFF_BROADCAST
| IFF_MULTICAST
;
1116 dev
->watchdog_timeo
= 0;
1118 dev
->netdev_ops
= &lowpan_netdev_ops
;
1119 dev
->header_ops
= &lowpan_header_ops
;
1120 dev
->ml_priv
= &lowpan_mlme
;
1121 dev
->destructor
= free_netdev
;
1124 static int lowpan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1126 if (tb
[IFLA_ADDRESS
]) {
1127 if (nla_len(tb
[IFLA_ADDRESS
]) != IEEE802154_ADDR_LEN
)
1133 static int lowpan_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1134 struct packet_type
*pt
, struct net_device
*orig_dev
)
1136 struct sk_buff
*local_skb
;
1138 if (!netif_running(dev
))
1141 if (dev
->type
!= ARPHRD_IEEE802154
)
1144 /* check that it's our buffer */
1145 if (skb
->data
[0] == LOWPAN_DISPATCH_IPV6
) {
1146 /* Copy the packet so that the IPv6 header is
1149 local_skb
= skb_copy_expand(skb
, NET_SKB_PAD
- 1,
1150 skb_tailroom(skb
), GFP_ATOMIC
);
1154 local_skb
->protocol
= htons(ETH_P_IPV6
);
1155 local_skb
->pkt_type
= PACKET_HOST
;
1157 /* Pull off the 1-byte of 6lowpan header. */
1158 skb_pull(local_skb
, 1);
1159 skb_reset_network_header(local_skb
);
1160 skb_set_transport_header(local_skb
, sizeof(struct ipv6hdr
));
1162 lowpan_give_skb_to_devices(local_skb
);
1164 kfree_skb(local_skb
);
1167 switch (skb
->data
[0] & 0xe0) {
1168 case LOWPAN_DISPATCH_IPHC
: /* ipv6 datagram */
1169 case LOWPAN_DISPATCH_FRAG1
: /* first fragment header */
1170 case LOWPAN_DISPATCH_FRAGN
: /* next fragments headers */
1171 local_skb
= skb_clone(skb
, GFP_ATOMIC
);
1174 lowpan_process_data(local_skb
);
1183 return NET_RX_SUCCESS
;
1190 static int lowpan_newlink(struct net
*src_net
, struct net_device
*dev
,
1191 struct nlattr
*tb
[], struct nlattr
*data
[])
1193 struct net_device
*real_dev
;
1194 struct lowpan_dev_record
*entry
;
1196 pr_debug("adding new link\n");
1200 /* find and hold real wpan device */
1201 real_dev
= dev_get_by_index(src_net
, nla_get_u32(tb
[IFLA_LINK
]));
1205 lowpan_dev_info(dev
)->real_dev
= real_dev
;
1206 mutex_init(&lowpan_dev_info(dev
)->dev_list_mtx
);
1208 entry
= kzalloc(sizeof(struct lowpan_dev_record
), GFP_KERNEL
);
1211 lowpan_dev_info(dev
)->real_dev
= NULL
;
1217 mutex_lock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1218 INIT_LIST_HEAD(&entry
->list
);
1219 list_add_tail(&entry
->list
, &lowpan_devices
);
1220 mutex_unlock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1222 register_netdevice(dev
);
1227 static void lowpan_dellink(struct net_device
*dev
, struct list_head
*head
)
1229 struct lowpan_dev_info
*lowpan_dev
= lowpan_dev_info(dev
);
1230 struct net_device
*real_dev
= lowpan_dev
->real_dev
;
1231 struct lowpan_dev_record
*entry
, *tmp
;
1235 mutex_lock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1236 list_for_each_entry_safe(entry
, tmp
, &lowpan_devices
, list
) {
1237 if (entry
->ldev
== dev
) {
1238 list_del(&entry
->list
);
1242 mutex_unlock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1244 mutex_destroy(&lowpan_dev_info(dev
)->dev_list_mtx
);
1246 unregister_netdevice_queue(dev
, head
);
1251 static struct rtnl_link_ops lowpan_link_ops __read_mostly
= {
1253 .priv_size
= sizeof(struct lowpan_dev_info
),
1254 .setup
= lowpan_setup
,
1255 .newlink
= lowpan_newlink
,
1256 .dellink
= lowpan_dellink
,
1257 .validate
= lowpan_validate
,
1260 static inline int __init
lowpan_netlink_init(void)
1262 return rtnl_link_register(&lowpan_link_ops
);
1265 static inline void lowpan_netlink_fini(void)
1267 rtnl_link_unregister(&lowpan_link_ops
);
1270 static int lowpan_device_event(struct notifier_block
*unused
,
1271 unsigned long event
,
1274 struct net_device
*dev
= ptr
;
1275 LIST_HEAD(del_list
);
1276 struct lowpan_dev_record
*entry
, *tmp
;
1278 if (dev
->type
!= ARPHRD_IEEE802154
)
1281 if (event
== NETDEV_UNREGISTER
) {
1282 list_for_each_entry_safe(entry
, tmp
, &lowpan_devices
, list
) {
1283 if (lowpan_dev_info(entry
->ldev
)->real_dev
== dev
)
1284 lowpan_dellink(entry
->ldev
, &del_list
);
1287 unregister_netdevice_many(&del_list
);
1294 static struct notifier_block lowpan_dev_notifier
= {
1295 .notifier_call
= lowpan_device_event
,
1298 static struct packet_type lowpan_packet_type
= {
1299 .type
= __constant_htons(ETH_P_IEEE802154
),
1303 static int __init
lowpan_init_module(void)
1307 err
= lowpan_netlink_init();
1311 dev_add_pack(&lowpan_packet_type
);
1313 err
= register_netdevice_notifier(&lowpan_dev_notifier
);
1315 dev_remove_pack(&lowpan_packet_type
);
1316 lowpan_netlink_fini();
1322 static void __exit
lowpan_cleanup_module(void)
1324 struct lowpan_fragment
*frame
, *tframe
;
1326 lowpan_netlink_fini();
1328 dev_remove_pack(&lowpan_packet_type
);
1330 unregister_netdevice_notifier(&lowpan_dev_notifier
);
1332 /* Now 6lowpan packet_type is removed, so no new fragments are
1333 * expected on RX, therefore that's the time to clean incomplete
1336 spin_lock_bh(&flist_lock
);
1337 list_for_each_entry_safe(frame
, tframe
, &lowpan_fragments
, list
) {
1338 del_timer_sync(&frame
->timer
);
1339 list_del(&frame
->list
);
1340 dev_kfree_skb(frame
->skb
);
1343 spin_unlock_bh(&flist_lock
);
1346 module_init(lowpan_init_module
);
1347 module_exit(lowpan_cleanup_module
);
1348 MODULE_LICENSE("GPL");
1349 MODULE_ALIAS_RTNL_LINK("lowpan");