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 spinlock_t lock; /* concurency lock */
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 unsigned short fragment_tag;
125 static LIST_HEAD(lowpan_fragments);
126 spinlock_t flist_lock;
129 lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
131 return netdev_priv(dev);
134 static inline void lowpan_address_flip(u8 *src, u8 *dest)
137 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
138 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
141 /* list of all 6lowpan devices, uses for package delivering */
142 /* print data in line */
143 static inline void lowpan_raw_dump_inline(const char *caller, char *msg,
144 unsigned char *buf, int len)
148 pr_debug("(%s) %s: ", caller, msg);
149 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE,
150 16, 1, buf, len, false);
155 * print data in a table format:
157 * addr: xx xx xx xx xx xx
158 * addr: xx xx xx xx xx xx
161 static inline void lowpan_raw_dump_table(const char *caller, char *msg,
162 unsigned char *buf, int len)
166 pr_debug("(%s) %s:\n", caller, msg);
167 print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET,
168 16, 1, buf, len, false);
173 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
174 const unsigned char *lladdr)
178 if (is_addr_mac_addr_based(ipaddr, lladdr))
179 val = 3; /* 0-bits */
180 else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
181 /* compress IID to 16 bits xxxx::XXXX */
182 memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
184 val = 2; /* 16-bits */
186 /* do not compress IID => xxxx::IID */
187 memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
189 val = 1; /* 64-bits */
192 return rol8(val, shift);
196 lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr)
198 memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ALEN);
199 /* second bit-flip (Universe/Local) is done according RFC2464 */
200 ipaddr->s6_addr[8] ^= 0x02;
204 * Uncompress addresses based on a prefix and a postfix with zeroes in
205 * between. If the postfix is zero in length it will use the link address
206 * to configure the IP address (autoconf style).
207 * pref_post_count takes a byte where the first nibble specify prefix count
208 * and the second postfix count (NOTE: 15/0xf => 16 bytes copy).
211 lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr,
212 u8 const *prefix, u8 pref_post_count, unsigned char *lladdr)
214 u8 prefcount = pref_post_count >> 4;
215 u8 postcount = pref_post_count & 0x0f;
217 /* full nibble 15 => 16 */
218 prefcount = (prefcount == 15 ? 16 : prefcount);
219 postcount = (postcount == 15 ? 16 : postcount);
222 lowpan_raw_dump_inline(__func__, "linklocal address",
223 lladdr, IEEE802154_ALEN);
225 memcpy(ipaddr, prefix, prefcount);
227 if (prefcount + postcount < 16)
228 memset(&ipaddr->s6_addr[prefcount], 0,
229 16 - (prefcount + postcount));
232 memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount);
233 skb_pull(skb, postcount);
234 } else if (prefcount > 0) {
238 /* no IID based configuration if no prefix and no data */
239 lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr);
242 pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount,
244 lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
249 static u8 lowpan_fetch_skb_u8(struct sk_buff *skb)
259 static u16 lowpan_fetch_skb_u16(struct sk_buff *skb)
263 BUG_ON(!pskb_may_pull(skb, 2));
265 ret = skb->data[0] | (skb->data[1] << 8);
270 static int lowpan_header_create(struct sk_buff *skb,
271 struct net_device *dev,
272 unsigned short type, const void *_daddr,
273 const void *_saddr, unsigned len)
275 u8 tmp, iphc0, iphc1, *hc06_ptr;
277 const u8 *saddr = _saddr;
278 const u8 *daddr = _daddr;
280 struct ieee802154_addr sa, da;
282 if (type != ETH_P_IPV6)
285 * if this package isn't ipv6 one, where should it be routed?
287 head = kzalloc(100, GFP_KERNEL);
294 pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
295 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__,
296 hdr->version, ntohs(hdr->payload_len), hdr->nexthdr,
299 lowpan_raw_dump_table(__func__, "raw skb network header dump",
300 skb_network_header(skb), sizeof(struct ipv6hdr));
303 saddr = dev->dev_addr;
305 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
308 * As we copy some bit-length fields, in the IPHC encoding bytes,
309 * we sometimes use |=
310 * If the field is 0, and the current bit value in memory is 1,
311 * this does not work. We therefore reset the IPHC encoding here
313 iphc0 = LOWPAN_DISPATCH_IPHC;
316 /* TODO: context lookup */
318 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
321 * Traffic class, flow label
322 * If flow label is 0, compress it. If traffic class is 0, compress it
323 * We have to process both in the same time as the offset of traffic
324 * class depends on the presence of version and flow label
327 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
328 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
329 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
331 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
332 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
333 /* flow label can be compressed */
334 iphc0 |= LOWPAN_IPHC_FL_C;
335 if ((hdr->priority == 0) &&
336 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
337 /* compress (elide) all */
338 iphc0 |= LOWPAN_IPHC_TC_C;
340 /* compress only the flow label */
345 /* Flow label cannot be compressed */
346 if ((hdr->priority == 0) &&
347 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
348 /* compress only traffic class */
349 iphc0 |= LOWPAN_IPHC_TC_C;
350 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
351 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
354 /* compress nothing */
355 memcpy(hc06_ptr, &hdr, 4);
356 /* replace the top byte with new ECN | DSCP format */
362 /* NOTE: payload length is always compressed */
364 /* Next Header is compress if UDP */
365 if (hdr->nexthdr == UIP_PROTO_UDP)
366 iphc0 |= LOWPAN_IPHC_NH_C;
368 /* TODO: next header compression */
370 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
371 *hc06_ptr = hdr->nexthdr;
377 * if 1: compress, encoding is 01
378 * if 64: compress, encoding is 10
379 * if 255: compress, encoding is 11
380 * else do not compress
382 switch (hdr->hop_limit) {
384 iphc0 |= LOWPAN_IPHC_TTL_1;
387 iphc0 |= LOWPAN_IPHC_TTL_64;
390 iphc0 |= LOWPAN_IPHC_TTL_255;
393 *hc06_ptr = hdr->hop_limit;
397 /* source address compression */
398 if (is_addr_unspecified(&hdr->saddr)) {
399 pr_debug("(%s): source address is unspecified, setting SAC\n",
401 iphc1 |= LOWPAN_IPHC_SAC;
402 /* TODO: context lookup */
403 } else if (is_addr_link_local(&hdr->saddr)) {
404 pr_debug("(%s): source address is link-local\n", __func__);
405 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
406 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
408 pr_debug("(%s): send the full source address\n", __func__);
409 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
413 /* destination address compression */
414 if (is_addr_mcast(&hdr->daddr)) {
415 pr_debug("(%s): destination address is multicast", __func__);
416 iphc1 |= LOWPAN_IPHC_M;
417 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
418 pr_debug("compressed to 1 octet\n");
419 iphc1 |= LOWPAN_IPHC_DAM_11;
421 *hc06_ptr = hdr->daddr.s6_addr[15];
423 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
424 pr_debug("compressed to 4 octets\n");
425 iphc1 |= LOWPAN_IPHC_DAM_10;
426 /* second byte + the last three */
427 *hc06_ptr = hdr->daddr.s6_addr[1];
428 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
430 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
431 pr_debug("compressed to 6 octets\n");
432 iphc1 |= LOWPAN_IPHC_DAM_01;
433 /* second byte + the last five */
434 *hc06_ptr = hdr->daddr.s6_addr[1];
435 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
438 pr_debug("using full address\n");
439 iphc1 |= LOWPAN_IPHC_DAM_00;
440 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
444 pr_debug("(%s): destination address is unicast: ", __func__);
445 /* TODO: context lookup */
446 if (is_addr_link_local(&hdr->daddr)) {
447 pr_debug("destination address is link-local\n");
448 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
449 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
451 pr_debug("using full address\n");
452 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
457 /* TODO: UDP header compression */
458 /* TODO: Next Header compression */
463 skb_pull(skb, sizeof(struct ipv6hdr));
464 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
468 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
472 * NOTE1: I'm still unsure about the fact that compression and WPAN
473 * header are created here and not later in the xmit. So wait for
474 * an opinion of net maintainers.
477 * NOTE2: to be absolutely correct, we must derive PANid information
478 * from MAC subif of the 'dev' and 'real_dev' network devices, but
479 * this isn't implemented in mainline yet, so currently we assign 0xff
482 /* prepare wpan address data */
483 sa.addr_type = IEEE802154_ADDR_LONG;
486 da.addr_type = IEEE802154_ADDR_LONG;
489 memcpy(&(da.hwaddr), daddr, 8);
490 memcpy(&(sa.hwaddr), saddr, 8);
492 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
494 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
495 type, (void *)&da, (void *)&sa, skb->len);
499 static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
502 struct lowpan_dev_record *entry;
503 int stat = NET_RX_SUCCESS;
505 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
512 skb_push(new, sizeof(struct ipv6hdr));
513 skb_reset_network_header(new);
514 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
516 new->protocol = htons(ETH_P_IPV6);
517 new->pkt_type = PACKET_HOST;
520 list_for_each_entry_rcu(entry, &lowpan_devices, list)
521 if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
522 skb = skb_copy(new, GFP_ATOMIC);
528 skb->dev = entry->ldev;
529 stat = netif_rx(skb);
538 static void lowpan_fragment_timer_expired(unsigned long entry_addr)
540 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
542 pr_debug("%s: timer expired for frame with tag %d\n", __func__,
545 spin_lock(&flist_lock);
546 list_del(&entry->list);
547 spin_unlock(&flist_lock);
549 dev_kfree_skb(entry->skb);
554 lowpan_process_data(struct sk_buff *skb)
557 u8 tmp, iphc0, iphc1, num_context = 0;
561 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
563 /* at least two bytes will be used for the encoding */
566 iphc0 = lowpan_fetch_skb_u8(skb);
568 /* fragments assembling */
569 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
570 case LOWPAN_DISPATCH_FRAG1:
571 case LOWPAN_DISPATCH_FRAGN:
573 struct lowpan_fragment *frame;
578 len = lowpan_fetch_skb_u8(skb); /* frame length */
579 tag = lowpan_fetch_skb_u16(skb);
582 * check if frame assembling with the same tag is
583 * already in progress
585 spin_lock(&flist_lock);
587 list_for_each_entry(frame, &lowpan_fragments, list)
588 if (frame->tag == tag) {
593 /* alloc new frame structure */
595 frame = kzalloc(sizeof(struct lowpan_fragment),
598 goto unlock_and_drop;
600 INIT_LIST_HEAD(&frame->list);
602 frame->length = (iphc0 & 7) | (len << 3);
605 /* allocate buffer for frame assembling */
606 frame->skb = alloc_skb(frame->length +
607 sizeof(struct ipv6hdr), GFP_ATOMIC);
611 goto unlock_and_drop;
614 frame->skb->priority = skb->priority;
615 frame->skb->dev = skb->dev;
617 /* reserve headroom for uncompressed ipv6 header */
618 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
619 skb_put(frame->skb, frame->length);
621 init_timer(&frame->timer);
622 /* time out is the same as for ipv6 - 60 sec */
623 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
624 frame->timer.data = (unsigned long)frame;
625 frame->timer.function = lowpan_fragment_timer_expired;
627 add_timer(&frame->timer);
629 list_add_tail(&frame->list, &lowpan_fragments);
632 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
633 goto unlock_and_drop;
635 offset = lowpan_fetch_skb_u8(skb); /* fetch offset */
637 /* if payload fits buffer, copy it */
638 if (likely((offset * 8 + skb->len) <= frame->length))
639 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
640 skb->data, skb->len);
642 goto unlock_and_drop;
644 frame->bytes_rcv += skb->len;
646 /* frame assembling complete */
647 if ((frame->bytes_rcv == frame->length) &&
648 frame->timer.expires > jiffies) {
649 /* if timer haven't expired - first of all delete it */
650 del_timer(&frame->timer);
651 list_del(&frame->list);
652 spin_unlock(&flist_lock);
657 iphc0 = lowpan_fetch_skb_u8(skb);
660 spin_unlock(&flist_lock);
662 return kfree_skb(skb), 0;
668 iphc1 = lowpan_fetch_skb_u8(skb);
670 _saddr = mac_cb(skb)->sa.hwaddr;
671 _daddr = mac_cb(skb)->da.hwaddr;
673 pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1);
675 /* another if the CID flag is set */
676 if (iphc1 & LOWPAN_IPHC_CID) {
677 pr_debug("(%s): CID flag is set, increase header with one\n",
681 num_context = lowpan_fetch_skb_u8(skb);
686 /* Traffic Class and Flow Label */
687 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
689 * Traffic Class and FLow Label carried in-line
690 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
695 tmp = lowpan_fetch_skb_u8(skb);
696 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
698 hdr.priority = ((tmp >> 2) & 0x0f);
699 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
700 (hdr.flow_lbl[0] & 0x0f);
703 * Traffic class carried in-line
704 * ECN + DSCP (1 byte), Flow Label is elided
709 tmp = lowpan_fetch_skb_u8(skb);
710 hdr.priority = ((tmp >> 2) & 0x0f);
711 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
716 * Flow Label carried in-line
717 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
722 tmp = lowpan_fetch_skb_u8(skb);
723 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
724 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
727 /* Traffic Class and Flow Label are elided */
739 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
740 /* Next header is carried inline */
743 hdr.nexthdr = lowpan_fetch_skb_u8(skb);
744 pr_debug("(%s): NH flag is set, next header is carried "
745 "inline: %02x\n", __func__, hdr.nexthdr);
749 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
750 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
754 hdr.hop_limit = lowpan_fetch_skb_u8(skb);
757 /* Extract SAM to the tmp variable */
758 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
760 /* Source address uncompression */
761 pr_debug("(%s): source address stateless compression\n", __func__);
762 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
763 lowpan_unc_llconf[tmp], skb->data);
767 /* Extract DAM to the tmp variable */
768 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
770 /* check for Multicast Compression */
771 if (iphc1 & LOWPAN_IPHC_M) {
772 if (iphc1 & LOWPAN_IPHC_DAC) {
773 pr_debug("(%s): destination address context-based "
774 "multicast compression\n", __func__);
775 /* TODO: implement this */
777 u8 prefix[] = {0xff, 0x02};
779 pr_debug("(%s): destination address non-context-based"
780 " multicast compression\n", __func__);
781 if (0 < tmp && tmp < 3) {
785 prefix[1] = lowpan_fetch_skb_u8(skb);
788 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
789 lowpan_unc_mxconf[tmp], NULL);
794 pr_debug("(%s): destination address stateless compression\n",
796 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
797 lowpan_unc_llconf[tmp], skb->data);
802 /* TODO: UDP header parse */
804 /* Not fragmented package */
805 hdr.payload_len = htons(skb->len);
807 pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__,
808 skb_headroom(skb), skb->len);
810 pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
811 "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version,
812 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
814 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
816 return lowpan_skb_deliver(skb, &hdr);
819 spin_unlock(&flist_lock);
825 static int lowpan_set_address(struct net_device *dev, void *p)
827 struct sockaddr *sa = p;
829 if (netif_running(dev))
832 /* TODO: validate addr */
833 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
838 static int lowpan_get_mac_header_length(struct sk_buff *skb)
841 * Currently long addressing mode is supported only, so the overall
843 * FC SeqNum DPAN DA SA Sec
844 * 2 + 1 + 2 + 8 + 8 + 0 = 21
850 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
851 int mlen, int plen, int offset)
853 struct sk_buff *frag;
856 /* if payload length is zero, therefore it's a first fragment */
857 hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
859 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
861 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
865 frag->priority = skb->priority;
866 frag->dev = skb->dev;
868 /* copy header, MFR and payload */
869 memcpy(skb_put(frag, mlen), skb->data, mlen);
870 memcpy(skb_put(frag, hlen), head, hlen);
873 skb_copy_from_linear_data_offset(skb, offset + mlen,
874 skb_put(frag, plen), plen);
876 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
879 ret = dev_queue_xmit(frag);
888 lowpan_skb_fragmentation(struct sk_buff *skb)
890 int err, header_length, payload_length, tag, offset = 0;
893 header_length = lowpan_get_mac_header_length(skb);
894 payload_length = skb->len - header_length;
895 tag = fragment_tag++;
897 /* first fragment header */
898 head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7);
899 head[1] = (payload_length >> 3) & 0xff;
900 head[2] = tag & 0xff;
903 err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
905 /* next fragment header */
906 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
907 head[0] |= LOWPAN_DISPATCH_FRAGN;
909 while ((payload_length - offset > 0) && (err >= 0)) {
910 int len = LOWPAN_FRAG_SIZE;
912 head[4] = offset / 8;
914 if (payload_length - offset < len)
915 len = payload_length - offset;
917 err = lowpan_fragment_xmit(skb, head, header_length,
925 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
929 pr_debug("(%s): package xmit\n", __func__);
931 skb->dev = lowpan_dev_info(dev)->real_dev;
932 if (skb->dev == NULL) {
933 pr_debug("(%s) ERROR: no real wpan device found\n", __func__);
937 if (skb->len <= IEEE802154_MTU) {
938 err = dev_queue_xmit(skb);
942 pr_debug("(%s): frame is too big, fragmentation is needed\n",
944 err = lowpan_skb_fragmentation(skb);
949 pr_debug("(%s): ERROR: xmit failed\n", __func__);
951 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
954 static void lowpan_dev_free(struct net_device *dev)
956 dev_put(lowpan_dev_info(dev)->real_dev);
960 static struct header_ops lowpan_header_ops = {
961 .create = lowpan_header_create,
964 static const struct net_device_ops lowpan_netdev_ops = {
965 .ndo_start_xmit = lowpan_xmit,
966 .ndo_set_mac_address = lowpan_set_address,
969 static void lowpan_setup(struct net_device *dev)
971 pr_debug("(%s)\n", __func__);
973 dev->addr_len = IEEE802154_ADDR_LEN;
974 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
975 dev->type = ARPHRD_IEEE802154;
976 /* Frame Control + Sequence Number + Address fields + Security Header */
977 dev->hard_header_len = 2 + 1 + 20 + 14;
978 dev->needed_tailroom = 2; /* FCS */
980 dev->tx_queue_len = 0;
981 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
982 dev->watchdog_timeo = 0;
984 dev->netdev_ops = &lowpan_netdev_ops;
985 dev->header_ops = &lowpan_header_ops;
986 dev->destructor = lowpan_dev_free;
989 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
991 pr_debug("(%s)\n", __func__);
993 if (tb[IFLA_ADDRESS]) {
994 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1000 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1001 struct packet_type *pt, struct net_device *orig_dev)
1003 if (!netif_running(dev))
1006 if (dev->type != ARPHRD_IEEE802154)
1009 /* check that it's our buffer */
1010 switch (skb->data[0] & 0xe0) {
1011 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1012 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1013 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
1014 lowpan_process_data(skb);
1020 return NET_RX_SUCCESS;
1027 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1028 struct nlattr *tb[], struct nlattr *data[])
1030 struct net_device *real_dev;
1031 struct lowpan_dev_record *entry;
1033 pr_debug("(%s)\n", __func__);
1037 /* find and hold real wpan device */
1038 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1042 lowpan_dev_info(dev)->real_dev = real_dev;
1043 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1045 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
1048 lowpan_dev_info(dev)->real_dev = NULL;
1054 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1055 INIT_LIST_HEAD(&entry->list);
1056 list_add_tail(&entry->list, &lowpan_devices);
1057 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1059 register_netdevice(dev);
1064 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1066 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1067 struct net_device *real_dev = lowpan_dev->real_dev;
1068 struct lowpan_dev_record *entry;
1069 struct lowpan_dev_record *tmp;
1073 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1074 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1075 if (entry->ldev == dev) {
1076 list_del(&entry->list);
1080 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1082 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1084 unregister_netdevice_queue(dev, head);
1089 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1091 .priv_size = sizeof(struct lowpan_dev_info),
1092 .setup = lowpan_setup,
1093 .newlink = lowpan_newlink,
1094 .dellink = lowpan_dellink,
1095 .validate = lowpan_validate,
1098 static inline int __init lowpan_netlink_init(void)
1100 return rtnl_link_register(&lowpan_link_ops);
1103 static inline void __init lowpan_netlink_fini(void)
1105 rtnl_link_unregister(&lowpan_link_ops);
1108 static struct packet_type lowpan_packet_type = {
1109 .type = __constant_htons(ETH_P_IEEE802154),
1113 static int __init lowpan_init_module(void)
1117 pr_debug("(%s)\n", __func__);
1119 err = lowpan_netlink_init();
1123 dev_add_pack(&lowpan_packet_type);
1128 static void __exit lowpan_cleanup_module(void)
1130 pr_debug("(%s)\n", __func__);
1132 lowpan_netlink_fini();
1134 dev_remove_pack(&lowpan_packet_type);
1137 module_init(lowpan_init_module);
1138 module_exit(lowpan_cleanup_module);
1139 MODULE_LICENSE("GPL");
1140 MODULE_ALIAS_RTNL_LINK("lowpan");