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 */
107 unsigned short fragment_tag
;
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 u16 length
; /* length to be assemled */
118 u32 bytes_rcv
; /* bytes received */
119 u16 tag
; /* current fragment tag */
120 struct timer_list timer
; /* assembling timer */
121 struct list_head list
; /* fragments list */
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
);
227 memcpy(&ipaddr
->s6_addr
[16 - postcount
], skb
->data
, postcount
);
228 skb_pull(skb
, postcount
);
229 } else if (prefcount
> 0) {
233 /* no IID based configuration if no prefix and no data */
234 lowpan_uip_ds6_set_addr_iid(ipaddr
, lladdr
);
237 pr_debug("uncompressing %d + %d => ", prefcount
, postcount
);
238 lowpan_raw_dump_inline(NULL
, NULL
, ipaddr
->s6_addr
, 16);
244 lowpan_compress_udp_header(u8
**hc06_ptr
, struct sk_buff
*skb
)
246 struct udphdr
*uh
= udp_hdr(skb
);
248 if (((uh
->source
& LOWPAN_NHC_UDP_4BIT_MASK
) ==
249 LOWPAN_NHC_UDP_4BIT_PORT
) &&
250 ((uh
->dest
& LOWPAN_NHC_UDP_4BIT_MASK
) ==
251 LOWPAN_NHC_UDP_4BIT_PORT
)) {
252 pr_debug("UDP header: both ports compression to 4 bits\n");
253 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_11
;
254 **(hc06_ptr
+ 1) = /* subtraction is faster */
255 (u8
)((uh
->dest
- LOWPAN_NHC_UDP_4BIT_PORT
) +
256 ((uh
->source
& LOWPAN_NHC_UDP_4BIT_PORT
) << 4));
258 } else if ((uh
->dest
& LOWPAN_NHC_UDP_8BIT_MASK
) ==
259 LOWPAN_NHC_UDP_8BIT_PORT
) {
260 pr_debug("UDP header: remove 8 bits of dest\n");
261 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_01
;
262 memcpy(*hc06_ptr
+ 1, &uh
->source
, 2);
263 **(hc06_ptr
+ 3) = (u8
)(uh
->dest
- LOWPAN_NHC_UDP_8BIT_PORT
);
265 } else if ((uh
->source
& LOWPAN_NHC_UDP_8BIT_MASK
) ==
266 LOWPAN_NHC_UDP_8BIT_PORT
) {
267 pr_debug("UDP header: remove 8 bits of source\n");
268 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_10
;
269 memcpy(*hc06_ptr
+ 1, &uh
->dest
, 2);
270 **(hc06_ptr
+ 3) = (u8
)(uh
->source
- LOWPAN_NHC_UDP_8BIT_PORT
);
273 pr_debug("UDP header: can't compress\n");
274 **hc06_ptr
= LOWPAN_NHC_UDP_CS_P_00
;
275 memcpy(*hc06_ptr
+ 1, &uh
->source
, 2);
276 memcpy(*hc06_ptr
+ 3, &uh
->dest
, 2);
280 /* checksum is always inline */
281 memcpy(*hc06_ptr
, &uh
->check
, 2);
284 /* skip the UDP header */
285 skb_pull(skb
, sizeof(struct udphdr
));
288 static inline int lowpan_fetch_skb_u8(struct sk_buff
*skb
, u8
*val
)
290 if (unlikely(!pskb_may_pull(skb
, 1)))
299 static inline int lowpan_fetch_skb_u16(struct sk_buff
*skb
, u16
*val
)
301 if (unlikely(!pskb_may_pull(skb
, 2)))
304 *val
= (skb
->data
[0] << 8) | skb
->data
[1];
311 lowpan_uncompress_udp_header(struct sk_buff
*skb
, struct udphdr
*uh
)
318 if (lowpan_fetch_skb_u8(skb
, &tmp
))
321 if ((tmp
& LOWPAN_NHC_UDP_MASK
) == LOWPAN_NHC_UDP_ID
) {
322 pr_debug("UDP header uncompression\n");
323 switch (tmp
& LOWPAN_NHC_UDP_CS_P_11
) {
324 case LOWPAN_NHC_UDP_CS_P_00
:
325 memcpy(&uh
->source
, &skb
->data
[0], 2);
326 memcpy(&uh
->dest
, &skb
->data
[2], 2);
329 case LOWPAN_NHC_UDP_CS_P_01
:
330 memcpy(&uh
->source
, &skb
->data
[0], 2);
332 skb
->data
[2] + LOWPAN_NHC_UDP_8BIT_PORT
;
335 case LOWPAN_NHC_UDP_CS_P_10
:
336 uh
->source
= skb
->data
[0] + LOWPAN_NHC_UDP_8BIT_PORT
;
337 memcpy(&uh
->dest
, &skb
->data
[1], 2);
340 case LOWPAN_NHC_UDP_CS_P_11
:
342 LOWPAN_NHC_UDP_4BIT_PORT
+ (skb
->data
[0] >> 4);
344 LOWPAN_NHC_UDP_4BIT_PORT
+ (skb
->data
[0] & 0x0f);
348 pr_debug("ERROR: unknown UDP format\n");
353 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
354 uh
->source
, uh
->dest
);
357 memcpy(&uh
->check
, &skb
->data
[0], 2);
361 * UDP lenght needs to be infered from the lower layers
362 * here, we obtain the hint from the remaining size of the
365 uh
->len
= htons(skb
->len
+ sizeof(struct udphdr
));
366 pr_debug("uncompressed UDP length: src = %d", uh
->len
);
368 pr_debug("ERROR: unsupported NH format\n");
377 static int lowpan_header_create(struct sk_buff
*skb
,
378 struct net_device
*dev
,
379 unsigned short type
, const void *_daddr
,
380 const void *_saddr
, unsigned int len
)
382 u8 tmp
, iphc0
, iphc1
, *hc06_ptr
;
384 const u8
*saddr
= _saddr
;
385 const u8
*daddr
= _daddr
;
387 struct ieee802154_addr sa
, da
;
390 * if this package isn't ipv6 one, where should it be routed?
392 if (type
!= ETH_P_IPV6
)
398 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
399 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr
->version
,
400 ntohs(hdr
->payload_len
), hdr
->nexthdr
, hdr
->hop_limit
);
402 lowpan_raw_dump_table(__func__
, "raw skb network header dump",
403 skb_network_header(skb
), sizeof(struct ipv6hdr
));
406 saddr
= dev
->dev_addr
;
408 lowpan_raw_dump_inline(__func__
, "saddr", (unsigned char *)saddr
, 8);
411 * As we copy some bit-length fields, in the IPHC encoding bytes,
412 * we sometimes use |=
413 * If the field is 0, and the current bit value in memory is 1,
414 * this does not work. We therefore reset the IPHC encoding here
416 iphc0
= LOWPAN_DISPATCH_IPHC
;
419 /* TODO: context lookup */
421 lowpan_raw_dump_inline(__func__
, "daddr", (unsigned char *)daddr
, 8);
424 * Traffic class, flow label
425 * If flow label is 0, compress it. If traffic class is 0, compress it
426 * We have to process both in the same time as the offset of traffic
427 * class depends on the presence of version and flow label
430 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
431 tmp
= (hdr
->priority
<< 4) | (hdr
->flow_lbl
[0] >> 4);
432 tmp
= ((tmp
& 0x03) << 6) | (tmp
>> 2);
434 if (((hdr
->flow_lbl
[0] & 0x0F) == 0) &&
435 (hdr
->flow_lbl
[1] == 0) && (hdr
->flow_lbl
[2] == 0)) {
436 /* flow label can be compressed */
437 iphc0
|= LOWPAN_IPHC_FL_C
;
438 if ((hdr
->priority
== 0) &&
439 ((hdr
->flow_lbl
[0] & 0xF0) == 0)) {
440 /* compress (elide) all */
441 iphc0
|= LOWPAN_IPHC_TC_C
;
443 /* compress only the flow label */
448 /* Flow label cannot be compressed */
449 if ((hdr
->priority
== 0) &&
450 ((hdr
->flow_lbl
[0] & 0xF0) == 0)) {
451 /* compress only traffic class */
452 iphc0
|= LOWPAN_IPHC_TC_C
;
453 *hc06_ptr
= (tmp
& 0xc0) | (hdr
->flow_lbl
[0] & 0x0F);
454 memcpy(hc06_ptr
+ 1, &hdr
->flow_lbl
[1], 2);
457 /* compress nothing */
458 memcpy(hc06_ptr
, &hdr
, 4);
459 /* replace the top byte with new ECN | DSCP format */
465 /* NOTE: payload length is always compressed */
467 /* Next Header is compress if UDP */
468 if (hdr
->nexthdr
== UIP_PROTO_UDP
)
469 iphc0
|= LOWPAN_IPHC_NH_C
;
471 if ((iphc0
& LOWPAN_IPHC_NH_C
) == 0) {
472 *hc06_ptr
= hdr
->nexthdr
;
478 * if 1: compress, encoding is 01
479 * if 64: compress, encoding is 10
480 * if 255: compress, encoding is 11
481 * else do not compress
483 switch (hdr
->hop_limit
) {
485 iphc0
|= LOWPAN_IPHC_TTL_1
;
488 iphc0
|= LOWPAN_IPHC_TTL_64
;
491 iphc0
|= LOWPAN_IPHC_TTL_255
;
494 *hc06_ptr
= hdr
->hop_limit
;
499 /* source address compression */
500 if (is_addr_unspecified(&hdr
->saddr
)) {
501 pr_debug("source address is unspecified, setting SAC\n");
502 iphc1
|= LOWPAN_IPHC_SAC
;
503 /* TODO: context lookup */
504 } else if (is_addr_link_local(&hdr
->saddr
)) {
505 pr_debug("source address is link-local\n");
506 iphc1
|= lowpan_compress_addr_64(&hc06_ptr
,
507 LOWPAN_IPHC_SAM_BIT
, &hdr
->saddr
, saddr
);
509 pr_debug("send the full source address\n");
510 memcpy(hc06_ptr
, &hdr
->saddr
.s6_addr16
[0], 16);
514 /* destination address compression */
515 if (is_addr_mcast(&hdr
->daddr
)) {
516 pr_debug("destination address is multicast: ");
517 iphc1
|= LOWPAN_IPHC_M
;
518 if (lowpan_is_mcast_addr_compressable8(&hdr
->daddr
)) {
519 pr_debug("compressed to 1 octet\n");
520 iphc1
|= LOWPAN_IPHC_DAM_11
;
522 *hc06_ptr
= hdr
->daddr
.s6_addr
[15];
524 } else if (lowpan_is_mcast_addr_compressable32(&hdr
->daddr
)) {
525 pr_debug("compressed to 4 octets\n");
526 iphc1
|= LOWPAN_IPHC_DAM_10
;
527 /* second byte + the last three */
528 *hc06_ptr
= hdr
->daddr
.s6_addr
[1];
529 memcpy(hc06_ptr
+ 1, &hdr
->daddr
.s6_addr
[13], 3);
531 } else if (lowpan_is_mcast_addr_compressable48(&hdr
->daddr
)) {
532 pr_debug("compressed to 6 octets\n");
533 iphc1
|= LOWPAN_IPHC_DAM_01
;
534 /* second byte + the last five */
535 *hc06_ptr
= hdr
->daddr
.s6_addr
[1];
536 memcpy(hc06_ptr
+ 1, &hdr
->daddr
.s6_addr
[11], 5);
539 pr_debug("using full address\n");
540 iphc1
|= LOWPAN_IPHC_DAM_00
;
541 memcpy(hc06_ptr
, &hdr
->daddr
.s6_addr
[0], 16);
545 /* TODO: context lookup */
546 if (is_addr_link_local(&hdr
->daddr
)) {
547 pr_debug("dest address is unicast and link-local\n");
548 iphc1
|= lowpan_compress_addr_64(&hc06_ptr
,
549 LOWPAN_IPHC_DAM_BIT
, &hdr
->daddr
, daddr
);
551 pr_debug("dest address is unicast: using full one\n");
552 memcpy(hc06_ptr
, &hdr
->daddr
.s6_addr16
[0], 16);
557 /* UDP header compression */
558 if (hdr
->nexthdr
== UIP_PROTO_UDP
)
559 lowpan_compress_udp_header(&hc06_ptr
, skb
);
564 skb_pull(skb
, sizeof(struct ipv6hdr
));
565 memcpy(skb_push(skb
, hc06_ptr
- head
), head
, hc06_ptr
- head
);
567 lowpan_raw_dump_table(__func__
, "raw skb data dump", skb
->data
,
571 * NOTE1: I'm still unsure about the fact that compression and WPAN
572 * header are created here and not later in the xmit. So wait for
573 * an opinion of net maintainers.
576 * NOTE2: to be absolutely correct, we must derive PANid information
577 * from MAC subif of the 'dev' and 'real_dev' network devices, but
578 * this isn't implemented in mainline yet, so currently we assign 0xff
581 mac_cb(skb
)->flags
= IEEE802154_FC_TYPE_DATA
;
582 mac_cb(skb
)->seq
= ieee802154_mlme_ops(dev
)->get_dsn(dev
);
584 /* prepare wpan address data */
585 sa
.addr_type
= IEEE802154_ADDR_LONG
;
586 sa
.pan_id
= ieee802154_mlme_ops(dev
)->get_pan_id(dev
);
588 memcpy(&(sa
.hwaddr
), saddr
, 8);
589 /* intra-PAN communications */
590 da
.pan_id
= ieee802154_mlme_ops(dev
)->get_pan_id(dev
);
593 * if the destination address is the broadcast address, use the
594 * corresponding short address
596 if (lowpan_is_addr_broadcast(daddr
)) {
597 da
.addr_type
= IEEE802154_ADDR_SHORT
;
598 da
.short_addr
= IEEE802154_ADDR_BROADCAST
;
600 da
.addr_type
= IEEE802154_ADDR_LONG
;
601 memcpy(&(da
.hwaddr
), daddr
, IEEE802154_ADDR_LEN
);
603 /* request acknowledgment */
604 mac_cb(skb
)->flags
|= MAC_CB_FLAG_ACKREQ
;
607 return dev_hard_header(skb
, lowpan_dev_info(dev
)->real_dev
,
608 type
, (void *)&da
, (void *)&sa
, skb
->len
);
612 static int lowpan_give_skb_to_devices(struct sk_buff
*skb
)
614 struct lowpan_dev_record
*entry
;
615 struct sk_buff
*skb_cp
;
616 int stat
= NET_RX_SUCCESS
;
619 list_for_each_entry_rcu(entry
, &lowpan_devices
, list
)
620 if (lowpan_dev_info(entry
->ldev
)->real_dev
== skb
->dev
) {
621 skb_cp
= skb_copy(skb
, GFP_ATOMIC
);
627 skb_cp
->dev
= entry
->ldev
;
628 stat
= netif_rx(skb_cp
);
635 static int lowpan_skb_deliver(struct sk_buff
*skb
, struct ipv6hdr
*hdr
)
638 int stat
= NET_RX_SUCCESS
;
640 new = skb_copy_expand(skb
, sizeof(struct ipv6hdr
), skb_tailroom(skb
),
647 skb_push(new, sizeof(struct ipv6hdr
));
648 skb_reset_network_header(new);
649 skb_copy_to_linear_data(new, hdr
, sizeof(struct ipv6hdr
));
651 new->protocol
= htons(ETH_P_IPV6
);
652 new->pkt_type
= PACKET_HOST
;
654 stat
= lowpan_give_skb_to_devices(new);
661 static void lowpan_fragment_timer_expired(unsigned long entry_addr
)
663 struct lowpan_fragment
*entry
= (struct lowpan_fragment
*)entry_addr
;
665 pr_debug("timer expired for frame with tag %d\n", entry
->tag
);
667 list_del(&entry
->list
);
668 dev_kfree_skb(entry
->skb
);
672 static struct lowpan_fragment
*
673 lowpan_alloc_new_frame(struct sk_buff
*skb
, u16 len
, u16 tag
)
675 struct lowpan_fragment
*frame
;
677 frame
= kzalloc(sizeof(struct lowpan_fragment
),
682 INIT_LIST_HEAD(&frame
->list
);
687 /* allocate buffer for frame assembling */
688 frame
->skb
= netdev_alloc_skb_ip_align(skb
->dev
, frame
->length
+
689 sizeof(struct ipv6hdr
));
694 frame
->skb
->priority
= skb
->priority
;
695 frame
->skb
->dev
= skb
->dev
;
697 /* reserve headroom for uncompressed ipv6 header */
698 skb_reserve(frame
->skb
, sizeof(struct ipv6hdr
));
699 skb_put(frame
->skb
, frame
->length
);
701 init_timer(&frame
->timer
);
702 /* time out is the same as for ipv6 - 60 sec */
703 frame
->timer
.expires
= jiffies
+ LOWPAN_FRAG_TIMEOUT
;
704 frame
->timer
.data
= (unsigned long)frame
;
705 frame
->timer
.function
= lowpan_fragment_timer_expired
;
707 add_timer(&frame
->timer
);
709 list_add_tail(&frame
->list
, &lowpan_fragments
);
720 lowpan_process_data(struct sk_buff
*skb
)
722 struct ipv6hdr hdr
= {};
723 u8 tmp
, iphc0
, iphc1
, num_context
= 0;
727 lowpan_raw_dump_table(__func__
, "raw skb data dump", skb
->data
,
729 /* at least two bytes will be used for the encoding */
733 if (lowpan_fetch_skb_u8(skb
, &iphc0
))
736 /* fragments assembling */
737 switch (iphc0
& LOWPAN_DISPATCH_MASK
) {
738 case LOWPAN_DISPATCH_FRAG1
:
739 case LOWPAN_DISPATCH_FRAGN
:
741 struct lowpan_fragment
*frame
;
742 /* slen stores the rightmost 8 bits of the 11 bits length */
747 if (lowpan_fetch_skb_u8(skb
, &slen
) || /* frame length */
748 lowpan_fetch_skb_u16(skb
, &tag
)) /* fragment tag */
751 /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
752 len
= ((iphc0
& 7) << 8) | slen
;
754 if ((iphc0
& LOWPAN_DISPATCH_MASK
) == LOWPAN_DISPATCH_FRAG1
) {
755 pr_debug("%s received a FRAG1 packet (tag: %d, "
756 "size of the entire IP packet: %d)",
759 if (lowpan_fetch_skb_u8(skb
, &offset
))
760 goto unlock_and_drop
;
761 pr_debug("%s received a FRAGN packet (tag: %d, "
762 "size of the entire IP packet: %d, "
763 "offset: %d)", __func__
, tag
, len
, offset
* 8);
767 * check if frame assembling with the same tag is
768 * already in progress
770 spin_lock_bh(&flist_lock
);
772 list_for_each_entry(frame
, &lowpan_fragments
, list
)
773 if (frame
->tag
== tag
) {
778 /* alloc new frame structure */
780 pr_debug("%s first fragment received for tag %d, "
781 "begin packet reassembly", __func__
, tag
);
782 frame
= lowpan_alloc_new_frame(skb
, len
, tag
);
784 goto unlock_and_drop
;
787 /* if payload fits buffer, copy it */
788 if (likely((offset
* 8 + skb
->len
) <= frame
->length
))
789 skb_copy_to_linear_data_offset(frame
->skb
, offset
* 8,
790 skb
->data
, skb
->len
);
792 goto unlock_and_drop
;
794 frame
->bytes_rcv
+= skb
->len
;
796 /* frame assembling complete */
797 if ((frame
->bytes_rcv
== frame
->length
) &&
798 frame
->timer
.expires
> jiffies
) {
799 /* if timer haven't expired - first of all delete it */
800 del_timer_sync(&frame
->timer
);
801 list_del(&frame
->list
);
802 spin_unlock_bh(&flist_lock
);
804 pr_debug("%s successfully reassembled fragment "
805 "(tag %d)", __func__
, tag
);
811 if (lowpan_fetch_skb_u8(skb
, &iphc0
))
816 spin_unlock_bh(&flist_lock
);
818 return kfree_skb(skb
), 0;
824 if (lowpan_fetch_skb_u8(skb
, &iphc1
))
827 _saddr
= mac_cb(skb
)->sa
.hwaddr
;
828 _daddr
= mac_cb(skb
)->da
.hwaddr
;
830 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0
, iphc1
);
832 /* another if the CID flag is set */
833 if (iphc1
& LOWPAN_IPHC_CID
) {
834 pr_debug("CID flag is set, increase header with one\n");
835 if (lowpan_fetch_skb_u8(skb
, &num_context
))
841 /* Traffic Class and Flow Label */
842 switch ((iphc0
& LOWPAN_IPHC_TF
) >> 3) {
844 * Traffic Class and FLow Label carried in-line
845 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
848 if (lowpan_fetch_skb_u8(skb
, &tmp
))
851 memcpy(&hdr
.flow_lbl
, &skb
->data
[0], 3);
853 hdr
.priority
= ((tmp
>> 2) & 0x0f);
854 hdr
.flow_lbl
[0] = ((tmp
>> 2) & 0x30) | (tmp
<< 6) |
855 (hdr
.flow_lbl
[0] & 0x0f);
858 * Traffic class carried in-line
859 * ECN + DSCP (1 byte), Flow Label is elided
862 if (lowpan_fetch_skb_u8(skb
, &tmp
))
865 hdr
.priority
= ((tmp
>> 2) & 0x0f);
866 hdr
.flow_lbl
[0] = ((tmp
<< 6) & 0xC0) | ((tmp
>> 2) & 0x30);
869 * Flow Label carried in-line
870 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
873 if (lowpan_fetch_skb_u8(skb
, &tmp
))
876 hdr
.flow_lbl
[0] = (skb
->data
[0] & 0x0F) | ((tmp
>> 2) & 0x30);
877 memcpy(&hdr
.flow_lbl
[1], &skb
->data
[0], 2);
880 /* Traffic Class and Flow Label are elided */
888 if ((iphc0
& LOWPAN_IPHC_NH_C
) == 0) {
889 /* Next header is carried inline */
890 if (lowpan_fetch_skb_u8(skb
, &(hdr
.nexthdr
)))
893 pr_debug("NH flag is set, next header carried inline: %02x\n",
898 if ((iphc0
& 0x03) != LOWPAN_IPHC_TTL_I
)
899 hdr
.hop_limit
= lowpan_ttl_values
[iphc0
& 0x03];
901 if (lowpan_fetch_skb_u8(skb
, &(hdr
.hop_limit
)))
905 /* Extract SAM to the tmp variable */
906 tmp
= ((iphc1
& LOWPAN_IPHC_SAM
) >> LOWPAN_IPHC_SAM_BIT
) & 0x03;
908 /* Source address uncompression */
909 pr_debug("source address stateless compression\n");
910 err
= lowpan_uncompress_addr(skb
, &hdr
.saddr
, lowpan_llprefix
,
911 lowpan_unc_llconf
[tmp
], skb
->data
);
915 /* Extract DAM to the tmp variable */
916 tmp
= ((iphc1
& LOWPAN_IPHC_DAM_11
) >> LOWPAN_IPHC_DAM_BIT
) & 0x03;
918 /* check for Multicast Compression */
919 if (iphc1
& LOWPAN_IPHC_M
) {
920 if (iphc1
& LOWPAN_IPHC_DAC
) {
921 pr_debug("dest: context-based mcast compression\n");
922 /* TODO: implement this */
924 u8 prefix
[] = {0xff, 0x02};
926 pr_debug("dest: non context-based mcast compression\n");
927 if (0 < tmp
&& tmp
< 3) {
928 if (lowpan_fetch_skb_u8(skb
, &prefix
[1]))
932 err
= lowpan_uncompress_addr(skb
, &hdr
.daddr
, prefix
,
933 lowpan_unc_mxconf
[tmp
], NULL
);
938 pr_debug("dest: stateless compression\n");
939 err
= lowpan_uncompress_addr(skb
, &hdr
.daddr
, lowpan_llprefix
,
940 lowpan_unc_llconf
[tmp
], skb
->data
);
945 /* UDP data uncompression */
946 if (iphc0
& LOWPAN_IPHC_NH_C
) {
949 if (lowpan_uncompress_udp_header(skb
, &uh
))
953 * replace the compressed UDP head by the uncompressed UDP
956 new = skb_copy_expand(skb
, sizeof(struct udphdr
),
957 skb_tailroom(skb
), GFP_ATOMIC
);
965 skb_push(skb
, sizeof(struct udphdr
));
966 skb_reset_transport_header(skb
);
967 skb_copy_to_linear_data(skb
, &uh
, sizeof(struct udphdr
));
969 lowpan_raw_dump_table(__func__
, "raw UDP header dump",
970 (u8
*)&uh
, sizeof(uh
));
972 hdr
.nexthdr
= UIP_PROTO_UDP
;
975 /* Not fragmented package */
976 hdr
.payload_len
= htons(skb
->len
);
978 pr_debug("skb headroom size = %d, data length = %d\n",
979 skb_headroom(skb
), skb
->len
);
981 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
982 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr
.version
,
983 ntohs(hdr
.payload_len
), hdr
.nexthdr
, hdr
.hop_limit
);
985 lowpan_raw_dump_table(__func__
, "raw header dump", (u8
*)&hdr
,
987 return lowpan_skb_deliver(skb
, &hdr
);
990 spin_unlock_bh(&flist_lock
);
996 static int lowpan_set_address(struct net_device
*dev
, void *p
)
998 struct sockaddr
*sa
= p
;
1000 if (netif_running(dev
))
1003 /* TODO: validate addr */
1004 memcpy(dev
->dev_addr
, sa
->sa_data
, dev
->addr_len
);
1009 static int lowpan_get_mac_header_length(struct sk_buff
*skb
)
1012 * Currently long addressing mode is supported only, so the overall
1013 * header size is 21:
1014 * FC SeqNum DPAN DA SA Sec
1015 * 2 + 1 + 2 + 8 + 8 + 0 = 21
1021 lowpan_fragment_xmit(struct sk_buff
*skb
, u8
*head
,
1022 int mlen
, int plen
, int offset
, int type
)
1024 struct sk_buff
*frag
;
1027 hlen
= (type
== LOWPAN_DISPATCH_FRAG1
) ?
1028 LOWPAN_FRAG1_HEAD_SIZE
: LOWPAN_FRAGN_HEAD_SIZE
;
1030 lowpan_raw_dump_inline(__func__
, "6lowpan fragment header", head
, hlen
);
1032 frag
= dev_alloc_skb(hlen
+ mlen
+ plen
+ IEEE802154_MFR_SIZE
);
1036 frag
->priority
= skb
->priority
;
1037 frag
->dev
= skb
->dev
;
1039 /* copy header, MFR and payload */
1040 memcpy(skb_put(frag
, mlen
), skb
->data
, mlen
);
1041 memcpy(skb_put(frag
, hlen
), head
, hlen
);
1044 skb_copy_from_linear_data_offset(skb
, offset
+ mlen
,
1045 skb_put(frag
, plen
), plen
);
1047 lowpan_raw_dump_table(__func__
, " raw fragment dump", frag
->data
,
1050 ret
= dev_queue_xmit(frag
);
1056 lowpan_skb_fragmentation(struct sk_buff
*skb
, struct net_device
*dev
)
1058 int err
, header_length
, payload_length
, tag
, offset
= 0;
1061 header_length
= lowpan_get_mac_header_length(skb
);
1062 payload_length
= skb
->len
- header_length
;
1063 tag
= lowpan_dev_info(dev
)->fragment_tag
++;
1065 /* first fragment header */
1066 head
[0] = LOWPAN_DISPATCH_FRAG1
| ((payload_length
>> 8) & 0x7);
1067 head
[1] = payload_length
& 0xff;
1069 head
[3] = tag
& 0xff;
1071 err
= lowpan_fragment_xmit(skb
, head
, header_length
, LOWPAN_FRAG_SIZE
,
1072 0, LOWPAN_DISPATCH_FRAG1
);
1075 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
1080 offset
= LOWPAN_FRAG_SIZE
;
1082 /* next fragment header */
1083 head
[0] &= ~LOWPAN_DISPATCH_FRAG1
;
1084 head
[0] |= LOWPAN_DISPATCH_FRAGN
;
1086 while ((payload_length
- offset
> 0) && (err
>= 0)) {
1087 int len
= LOWPAN_FRAG_SIZE
;
1089 head
[4] = offset
/ 8;
1091 if (payload_length
- offset
< len
)
1092 len
= payload_length
- offset
;
1094 err
= lowpan_fragment_xmit(skb
, head
, header_length
,
1095 len
, offset
, LOWPAN_DISPATCH_FRAGN
);
1097 pr_debug("%s unable to send a subsequent FRAGN packet "
1098 "(tag: %d, offset: %d", __func__
, tag
, offset
);
1109 static netdev_tx_t
lowpan_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1113 pr_debug("package xmit\n");
1115 skb
->dev
= lowpan_dev_info(dev
)->real_dev
;
1116 if (skb
->dev
== NULL
) {
1117 pr_debug("ERROR: no real wpan device found\n");
1121 /* Send directly if less than the MTU minus the 2 checksum bytes. */
1122 if (skb
->len
<= IEEE802154_MTU
- IEEE802154_MFR_SIZE
) {
1123 err
= dev_queue_xmit(skb
);
1127 pr_debug("frame is too big, fragmentation is needed\n");
1128 err
= lowpan_skb_fragmentation(skb
, dev
);
1133 pr_debug("ERROR: xmit failed\n");
1135 return (err
< 0) ? NET_XMIT_DROP
: err
;
1138 static struct wpan_phy
*lowpan_get_phy(const struct net_device
*dev
)
1140 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1141 return ieee802154_mlme_ops(real_dev
)->get_phy(real_dev
);
1144 static u16
lowpan_get_pan_id(const struct net_device
*dev
)
1146 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1147 return ieee802154_mlme_ops(real_dev
)->get_pan_id(real_dev
);
1150 static u16
lowpan_get_short_addr(const struct net_device
*dev
)
1152 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1153 return ieee802154_mlme_ops(real_dev
)->get_short_addr(real_dev
);
1156 static u8
lowpan_get_dsn(const struct net_device
*dev
)
1158 struct net_device
*real_dev
= lowpan_dev_info(dev
)->real_dev
;
1159 return ieee802154_mlme_ops(real_dev
)->get_dsn(real_dev
);
1162 static struct header_ops lowpan_header_ops
= {
1163 .create
= lowpan_header_create
,
1166 static const struct net_device_ops lowpan_netdev_ops
= {
1167 .ndo_start_xmit
= lowpan_xmit
,
1168 .ndo_set_mac_address
= lowpan_set_address
,
1171 static struct ieee802154_mlme_ops lowpan_mlme
= {
1172 .get_pan_id
= lowpan_get_pan_id
,
1173 .get_phy
= lowpan_get_phy
,
1174 .get_short_addr
= lowpan_get_short_addr
,
1175 .get_dsn
= lowpan_get_dsn
,
1178 static void lowpan_setup(struct net_device
*dev
)
1180 dev
->addr_len
= IEEE802154_ADDR_LEN
;
1181 memset(dev
->broadcast
, 0xff, IEEE802154_ADDR_LEN
);
1182 dev
->type
= ARPHRD_IEEE802154
;
1183 /* Frame Control + Sequence Number + Address fields + Security Header */
1184 dev
->hard_header_len
= 2 + 1 + 20 + 14;
1185 dev
->needed_tailroom
= 2; /* FCS */
1187 dev
->tx_queue_len
= 0;
1188 dev
->flags
= IFF_BROADCAST
| IFF_MULTICAST
;
1189 dev
->watchdog_timeo
= 0;
1191 dev
->netdev_ops
= &lowpan_netdev_ops
;
1192 dev
->header_ops
= &lowpan_header_ops
;
1193 dev
->ml_priv
= &lowpan_mlme
;
1194 dev
->destructor
= free_netdev
;
1197 static int lowpan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1199 if (tb
[IFLA_ADDRESS
]) {
1200 if (nla_len(tb
[IFLA_ADDRESS
]) != IEEE802154_ADDR_LEN
)
1206 static int lowpan_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1207 struct packet_type
*pt
, struct net_device
*orig_dev
)
1209 struct sk_buff
*local_skb
;
1211 if (!netif_running(dev
))
1214 if (dev
->type
!= ARPHRD_IEEE802154
)
1217 /* check that it's our buffer */
1218 if (skb
->data
[0] == LOWPAN_DISPATCH_IPV6
) {
1219 /* Copy the packet so that the IPv6 header is
1222 local_skb
= skb_copy_expand(skb
, NET_SKB_PAD
- 1,
1223 skb_tailroom(skb
), GFP_ATOMIC
);
1227 local_skb
->protocol
= htons(ETH_P_IPV6
);
1228 local_skb
->pkt_type
= PACKET_HOST
;
1230 /* Pull off the 1-byte of 6lowpan header. */
1231 skb_pull(local_skb
, 1);
1232 skb_reset_network_header(local_skb
);
1233 skb_set_transport_header(local_skb
, sizeof(struct ipv6hdr
));
1235 lowpan_give_skb_to_devices(local_skb
);
1237 kfree_skb(local_skb
);
1240 switch (skb
->data
[0] & 0xe0) {
1241 case LOWPAN_DISPATCH_IPHC
: /* ipv6 datagram */
1242 case LOWPAN_DISPATCH_FRAG1
: /* first fragment header */
1243 case LOWPAN_DISPATCH_FRAGN
: /* next fragments headers */
1244 local_skb
= skb_clone(skb
, GFP_ATOMIC
);
1247 lowpan_process_data(local_skb
);
1256 return NET_RX_SUCCESS
;
1263 static int lowpan_newlink(struct net
*src_net
, struct net_device
*dev
,
1264 struct nlattr
*tb
[], struct nlattr
*data
[])
1266 struct net_device
*real_dev
;
1267 struct lowpan_dev_record
*entry
;
1269 pr_debug("adding new link\n");
1273 /* find and hold real wpan device */
1274 real_dev
= dev_get_by_index(src_net
, nla_get_u32(tb
[IFLA_LINK
]));
1278 lowpan_dev_info(dev
)->real_dev
= real_dev
;
1279 lowpan_dev_info(dev
)->fragment_tag
= 0;
1280 mutex_init(&lowpan_dev_info(dev
)->dev_list_mtx
);
1282 entry
= kzalloc(sizeof(struct lowpan_dev_record
), GFP_KERNEL
);
1285 lowpan_dev_info(dev
)->real_dev
= NULL
;
1291 mutex_lock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1292 INIT_LIST_HEAD(&entry
->list
);
1293 list_add_tail(&entry
->list
, &lowpan_devices
);
1294 mutex_unlock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1296 register_netdevice(dev
);
1301 static void lowpan_dellink(struct net_device
*dev
, struct list_head
*head
)
1303 struct lowpan_dev_info
*lowpan_dev
= lowpan_dev_info(dev
);
1304 struct net_device
*real_dev
= lowpan_dev
->real_dev
;
1305 struct lowpan_dev_record
*entry
, *tmp
;
1309 mutex_lock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1310 list_for_each_entry_safe(entry
, tmp
, &lowpan_devices
, list
) {
1311 if (entry
->ldev
== dev
) {
1312 list_del(&entry
->list
);
1316 mutex_unlock(&lowpan_dev_info(dev
)->dev_list_mtx
);
1318 mutex_destroy(&lowpan_dev_info(dev
)->dev_list_mtx
);
1320 unregister_netdevice_queue(dev
, head
);
1325 static struct rtnl_link_ops lowpan_link_ops __read_mostly
= {
1327 .priv_size
= sizeof(struct lowpan_dev_info
),
1328 .setup
= lowpan_setup
,
1329 .newlink
= lowpan_newlink
,
1330 .dellink
= lowpan_dellink
,
1331 .validate
= lowpan_validate
,
1334 static inline int __init
lowpan_netlink_init(void)
1336 return rtnl_link_register(&lowpan_link_ops
);
1339 static inline void lowpan_netlink_fini(void)
1341 rtnl_link_unregister(&lowpan_link_ops
);
1344 static int lowpan_device_event(struct notifier_block
*unused
,
1345 unsigned long event
, void *ptr
)
1347 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1348 LIST_HEAD(del_list
);
1349 struct lowpan_dev_record
*entry
, *tmp
;
1351 if (dev
->type
!= ARPHRD_IEEE802154
)
1354 if (event
== NETDEV_UNREGISTER
) {
1355 list_for_each_entry_safe(entry
, tmp
, &lowpan_devices
, list
) {
1356 if (lowpan_dev_info(entry
->ldev
)->real_dev
== dev
)
1357 lowpan_dellink(entry
->ldev
, &del_list
);
1360 unregister_netdevice_many(&del_list
);
1367 static struct notifier_block lowpan_dev_notifier
= {
1368 .notifier_call
= lowpan_device_event
,
1371 static struct packet_type lowpan_packet_type
= {
1372 .type
= __constant_htons(ETH_P_IEEE802154
),
1376 static int __init
lowpan_init_module(void)
1380 err
= lowpan_netlink_init();
1384 dev_add_pack(&lowpan_packet_type
);
1386 err
= register_netdevice_notifier(&lowpan_dev_notifier
);
1388 dev_remove_pack(&lowpan_packet_type
);
1389 lowpan_netlink_fini();
1395 static void __exit
lowpan_cleanup_module(void)
1397 struct lowpan_fragment
*frame
, *tframe
;
1399 lowpan_netlink_fini();
1401 dev_remove_pack(&lowpan_packet_type
);
1403 unregister_netdevice_notifier(&lowpan_dev_notifier
);
1405 /* Now 6lowpan packet_type is removed, so no new fragments are
1406 * expected on RX, therefore that's the time to clean incomplete
1409 spin_lock_bh(&flist_lock
);
1410 list_for_each_entry_safe(frame
, tframe
, &lowpan_fragments
, list
) {
1411 del_timer_sync(&frame
->timer
);
1412 list_del(&frame
->list
);
1413 dev_kfree_skb(frame
->skb
);
1416 spin_unlock_bh(&flist_lock
);
1419 module_init(lowpan_init_module
);
1420 module_exit(lowpan_cleanup_module
);
1421 MODULE_LICENSE("GPL");
1422 MODULE_ALIAS_RTNL_LINK("lowpan");