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
55 #include <linux/bitops.h>
56 #include <linux/if_arp.h>
57 #include <linux/module.h>
58 #include <linux/moduleparam.h>
59 #include <linux/netdevice.h>
60 #include <net/af_ieee802154.h>
61 #include <net/ieee802154.h>
62 #include <net/ieee802154_netdev.h>
67 /* TTL uncompression values */
68 static const u8 lowpan_ttl_values[] = {0, 1, 64, 255};
70 static LIST_HEAD(lowpan_devices);
73 * Uncompression of linklocal:
74 * 0 -> 16 bytes from packet
75 * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet
76 * 2 -> 2 bytes from prefix - zeroes + 2 from packet
77 * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr
79 * NOTE: => the uncompress function does change 0xf to 0x10
80 * NOTE: 0x00 => no-autoconfig => unspecified
82 static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20};
85 * Uncompression of ctx-based:
86 * 0 -> 0 bits from packet [unspecified / reserved]
87 * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet
88 * 2 -> 8 bytes from prefix - zeroes + 2 from packet
89 * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr
91 static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80};
94 * Uncompression of ctx-base
95 * 0 -> 0 bits from packet
96 * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet
97 * 2 -> 2 bytes from prefix - zeroes + 3 from packet
98 * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr
100 static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
102 /* Link local prefix */
103 static const u8 lowpan_llprefix[] = {0xfe, 0x80};
105 /* private device info */
106 struct lowpan_dev_info {
107 struct net_device *real_dev; /* real WPAN device ptr */
108 struct mutex dev_list_mtx; /* mutex for list ops */
111 struct lowpan_dev_record {
112 struct net_device *ldev;
113 struct list_head list;
117 lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
119 return netdev_priv(dev);
122 static inline void lowpan_address_flip(u8 *src, u8 *dest)
125 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
126 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
129 /* list of all 6lowpan devices, uses for package delivering */
130 /* print data in line */
131 static inline void lowpan_raw_dump_inline(const char *caller, char *msg,
132 unsigned char *buf, int len)
136 pr_debug("(%s) %s: ", caller, msg);
137 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE,
138 16, 1, buf, len, false);
143 * print data in a table format:
145 * addr: xx xx xx xx xx xx
146 * addr: xx xx xx xx xx xx
149 static inline void lowpan_raw_dump_table(const char *caller, char *msg,
150 unsigned char *buf, int len)
154 pr_debug("(%s) %s:\n", caller, msg);
155 print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET,
156 16, 1, buf, len, false);
161 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
162 const unsigned char *lladdr)
166 if (is_addr_mac_addr_based(ipaddr, lladdr))
167 val = 3; /* 0-bits */
168 else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
169 /* compress IID to 16 bits xxxx::XXXX */
170 memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
172 val = 2; /* 16-bits */
174 /* do not compress IID => xxxx::IID */
175 memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
177 val = 1; /* 64-bits */
180 return rol8(val, shift);
184 lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr)
186 memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ALEN);
187 /* second bit-flip (Universe/Local) is done according RFC2464 */
188 ipaddr->s6_addr[8] ^= 0x02;
192 * Uncompress addresses based on a prefix and a postfix with zeroes in
193 * between. If the postfix is zero in length it will use the link address
194 * to configure the IP address (autoconf style).
195 * pref_post_count takes a byte where the first nibble specify prefix count
196 * and the second postfix count (NOTE: 15/0xf => 16 bytes copy).
199 lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr,
200 u8 const *prefix, u8 pref_post_count, unsigned char *lladdr)
202 u8 prefcount = pref_post_count >> 4;
203 u8 postcount = pref_post_count & 0x0f;
205 /* full nibble 15 => 16 */
206 prefcount = (prefcount == 15 ? 16 : prefcount);
207 postcount = (postcount == 15 ? 16 : postcount);
210 lowpan_raw_dump_inline(__func__, "linklocal address",
211 lladdr, IEEE802154_ALEN);
213 memcpy(ipaddr, prefix, prefcount);
215 if (prefcount + postcount < 16)
216 memset(&ipaddr->s6_addr[prefcount], 0,
217 16 - (prefcount + postcount));
220 memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount);
221 skb_pull(skb, postcount);
222 } else if (prefcount > 0) {
226 /* no IID based configuration if no prefix and no data */
227 lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr);
230 pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount,
232 lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
237 static u8 lowpan_fetch_skb_u8(struct sk_buff *skb)
247 static int lowpan_header_create(struct sk_buff *skb,
248 struct net_device *dev,
249 unsigned short type, const void *_daddr,
250 const void *_saddr, unsigned len)
252 u8 tmp, iphc0, iphc1, *hc06_ptr;
254 const u8 *saddr = _saddr;
255 const u8 *daddr = _daddr;
257 struct ieee802154_addr sa, da;
259 if (type != ETH_P_IPV6)
262 * if this package isn't ipv6 one, where should it be routed?
264 head = kzalloc(100, GFP_KERNEL);
271 pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
272 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__,
273 hdr->version, ntohs(hdr->payload_len), hdr->nexthdr,
276 lowpan_raw_dump_table(__func__, "raw skb network header dump",
277 skb_network_header(skb), sizeof(struct ipv6hdr));
280 saddr = dev->dev_addr;
282 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
285 * As we copy some bit-length fields, in the IPHC encoding bytes,
286 * we sometimes use |=
287 * If the field is 0, and the current bit value in memory is 1,
288 * this does not work. We therefore reset the IPHC encoding here
290 iphc0 = LOWPAN_DISPATCH_IPHC;
293 /* TODO: context lookup */
295 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
298 * Traffic class, flow label
299 * If flow label is 0, compress it. If traffic class is 0, compress it
300 * We have to process both in the same time as the offset of traffic
301 * class depends on the presence of version and flow label
304 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
305 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
306 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
308 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
309 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
310 /* flow label can be compressed */
311 iphc0 |= LOWPAN_IPHC_FL_C;
312 if ((hdr->priority == 0) &&
313 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
314 /* compress (elide) all */
315 iphc0 |= LOWPAN_IPHC_TC_C;
317 /* compress only the flow label */
322 /* Flow label cannot be compressed */
323 if ((hdr->priority == 0) &&
324 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
325 /* compress only traffic class */
326 iphc0 |= LOWPAN_IPHC_TC_C;
327 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
328 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
331 /* compress nothing */
332 memcpy(hc06_ptr, &hdr, 4);
333 /* replace the top byte with new ECN | DSCP format */
339 /* NOTE: payload length is always compressed */
341 /* Next Header is compress if UDP */
342 if (hdr->nexthdr == UIP_PROTO_UDP)
343 iphc0 |= LOWPAN_IPHC_NH_C;
345 /* TODO: next header compression */
347 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
348 *hc06_ptr = hdr->nexthdr;
354 * if 1: compress, encoding is 01
355 * if 64: compress, encoding is 10
356 * if 255: compress, encoding is 11
357 * else do not compress
359 switch (hdr->hop_limit) {
361 iphc0 |= LOWPAN_IPHC_TTL_1;
364 iphc0 |= LOWPAN_IPHC_TTL_64;
367 iphc0 |= LOWPAN_IPHC_TTL_255;
370 *hc06_ptr = hdr->hop_limit;
374 /* source address compression */
375 if (is_addr_unspecified(&hdr->saddr)) {
376 pr_debug("(%s): source address is unspecified, setting SAC\n",
378 iphc1 |= LOWPAN_IPHC_SAC;
379 /* TODO: context lookup */
380 } else if (is_addr_link_local(&hdr->saddr)) {
381 pr_debug("(%s): source address is link-local\n", __func__);
382 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
383 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
385 pr_debug("(%s): send the full source address\n", __func__);
386 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
390 /* destination address compression */
391 if (is_addr_mcast(&hdr->daddr)) {
392 pr_debug("(%s): destination address is multicast", __func__);
393 iphc1 |= LOWPAN_IPHC_M;
394 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
395 pr_debug("compressed to 1 octet\n");
396 iphc1 |= LOWPAN_IPHC_DAM_11;
398 *hc06_ptr = hdr->daddr.s6_addr[15];
400 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
401 pr_debug("compressed to 4 octets\n");
402 iphc1 |= LOWPAN_IPHC_DAM_10;
403 /* second byte + the last three */
404 *hc06_ptr = hdr->daddr.s6_addr[1];
405 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
407 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
408 pr_debug("compressed to 6 octets\n");
409 iphc1 |= LOWPAN_IPHC_DAM_01;
410 /* second byte + the last five */
411 *hc06_ptr = hdr->daddr.s6_addr[1];
412 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
415 pr_debug("using full address\n");
416 iphc1 |= LOWPAN_IPHC_DAM_00;
417 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
421 pr_debug("(%s): destination address is unicast: ", __func__);
422 /* TODO: context lookup */
423 if (is_addr_link_local(&hdr->daddr)) {
424 pr_debug("destination address is link-local\n");
425 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
426 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
428 pr_debug("using full address\n");
429 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
434 /* TODO: UDP header compression */
435 /* TODO: Next Header compression */
440 skb_pull(skb, sizeof(struct ipv6hdr));
441 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
445 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
449 * NOTE1: I'm still unsure about the fact that compression and WPAN
450 * header are created here and not later in the xmit. So wait for
451 * an opinion of net maintainers.
454 * NOTE2: to be absolutely correct, we must derive PANid information
455 * from MAC subif of the 'dev' and 'real_dev' network devices, but
456 * this isn't implemented in mainline yet, so currently we assign 0xff
459 /* prepare wpan address data */
460 sa.addr_type = IEEE802154_ADDR_LONG;
463 da.addr_type = IEEE802154_ADDR_LONG;
466 memcpy(&(da.hwaddr), daddr, 8);
467 memcpy(&(sa.hwaddr), saddr, 8);
469 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
470 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
471 type, (void *)&da, (void *)&sa, skb->len);
475 static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
478 struct lowpan_dev_record *entry;
479 int stat = NET_RX_SUCCESS;
481 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
488 skb_push(new, sizeof(struct ipv6hdr));
489 skb_reset_network_header(new);
490 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
492 new->protocol = htons(ETH_P_IPV6);
493 new->pkt_type = PACKET_HOST;
496 list_for_each_entry_rcu(entry, &lowpan_devices, list)
497 if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
498 skb = skb_copy(new, GFP_ATOMIC);
504 skb->dev = entry->ldev;
505 stat = netif_rx(skb);
515 lowpan_process_data(struct sk_buff *skb)
518 u8 tmp, iphc0, iphc1, num_context = 0;
522 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
524 /* at least two bytes will be used for the encoding */
527 iphc0 = lowpan_fetch_skb_u8(skb);
528 iphc1 = lowpan_fetch_skb_u8(skb);
530 _saddr = mac_cb(skb)->sa.hwaddr;
531 _daddr = mac_cb(skb)->da.hwaddr;
533 pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1);
535 /* another if the CID flag is set */
536 if (iphc1 & LOWPAN_IPHC_CID) {
537 pr_debug("(%s): CID flag is set, increase header with one\n",
541 num_context = lowpan_fetch_skb_u8(skb);
546 /* Traffic Class and Flow Label */
547 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
549 * Traffic Class and FLow Label carried in-line
550 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
555 tmp = lowpan_fetch_skb_u8(skb);
556 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
558 hdr.priority = ((tmp >> 2) & 0x0f);
559 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
560 (hdr.flow_lbl[0] & 0x0f);
563 * Traffic class carried in-line
564 * ECN + DSCP (1 byte), Flow Label is elided
569 tmp = lowpan_fetch_skb_u8(skb);
570 hdr.priority = ((tmp >> 2) & 0x0f);
571 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
576 * Flow Label carried in-line
577 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
582 tmp = lowpan_fetch_skb_u8(skb);
583 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
584 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
587 /* Traffic Class and Flow Label are elided */
599 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
600 /* Next header is carried inline */
603 hdr.nexthdr = lowpan_fetch_skb_u8(skb);
604 pr_debug("(%s): NH flag is set, next header is carried "
605 "inline: %02x\n", __func__, hdr.nexthdr);
609 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
610 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
614 hdr.hop_limit = lowpan_fetch_skb_u8(skb);
617 /* Extract SAM to the tmp variable */
618 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
620 /* Source address uncompression */
621 pr_debug("(%s): source address stateless compression\n", __func__);
622 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
623 lowpan_unc_llconf[tmp], skb->data);
627 /* Extract DAM to the tmp variable */
628 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
630 /* check for Multicast Compression */
631 if (iphc1 & LOWPAN_IPHC_M) {
632 if (iphc1 & LOWPAN_IPHC_DAC) {
633 pr_debug("(%s): destination address context-based "
634 "multicast compression\n", __func__);
635 /* TODO: implement this */
637 u8 prefix[] = {0xff, 0x02};
639 pr_debug("(%s): destination address non-context-based"
640 " multicast compression\n", __func__);
641 if (0 < tmp && tmp < 3) {
645 prefix[1] = lowpan_fetch_skb_u8(skb);
648 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
649 lowpan_unc_mxconf[tmp], NULL);
654 pr_debug("(%s): destination address stateless compression\n",
656 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
657 lowpan_unc_llconf[tmp], skb->data);
662 /* TODO: UDP header parse */
664 /* Not fragmented package */
665 hdr.payload_len = htons(skb->len);
667 pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__,
668 skb_headroom(skb), skb->len);
670 pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
671 "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version,
672 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
674 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
676 return lowpan_skb_deliver(skb, &hdr);
682 static int lowpan_set_address(struct net_device *dev, void *p)
684 struct sockaddr *sa = p;
686 if (netif_running(dev))
689 /* TODO: validate addr */
690 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
695 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
699 pr_debug("(%s): package xmit\n", __func__);
701 skb->dev = lowpan_dev_info(dev)->real_dev;
702 if (skb->dev == NULL) {
703 pr_debug("(%s) ERROR: no real wpan device found\n", __func__);
706 err = dev_queue_xmit(skb);
708 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
711 static void lowpan_dev_free(struct net_device *dev)
713 dev_put(lowpan_dev_info(dev)->real_dev);
717 static struct header_ops lowpan_header_ops = {
718 .create = lowpan_header_create,
721 static const struct net_device_ops lowpan_netdev_ops = {
722 .ndo_start_xmit = lowpan_xmit,
723 .ndo_set_mac_address = lowpan_set_address,
726 static void lowpan_setup(struct net_device *dev)
728 pr_debug("(%s)\n", __func__);
730 dev->addr_len = IEEE802154_ADDR_LEN;
731 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
732 dev->type = ARPHRD_IEEE802154;
733 dev->features = NETIF_F_NO_CSUM;
734 /* Frame Control + Sequence Number + Address fields + Security Header */
735 dev->hard_header_len = 2 + 1 + 20 + 14;
736 dev->needed_tailroom = 2; /* FCS */
738 dev->tx_queue_len = 0;
739 dev->flags = IFF_NOARP | IFF_BROADCAST;
740 dev->watchdog_timeo = 0;
742 dev->netdev_ops = &lowpan_netdev_ops;
743 dev->header_ops = &lowpan_header_ops;
744 dev->destructor = lowpan_dev_free;
747 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
749 pr_debug("(%s)\n", __func__);
751 if (tb[IFLA_ADDRESS]) {
752 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
758 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
759 struct packet_type *pt, struct net_device *orig_dev)
761 if (!netif_running(dev))
764 if (dev->type != ARPHRD_IEEE802154)
767 /* check that it's our buffer */
768 if ((skb->data[0] & 0xe0) == 0x60)
769 lowpan_process_data(skb);
771 return NET_RX_SUCCESS;
778 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
779 struct nlattr *tb[], struct nlattr *data[])
781 struct net_device *real_dev;
782 struct lowpan_dev_record *entry;
784 pr_debug("(%s)\n", __func__);
788 /* find and hold real wpan device */
789 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
793 lowpan_dev_info(dev)->real_dev = real_dev;
794 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
796 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
799 lowpan_dev_info(dev)->real_dev = NULL;
805 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
806 INIT_LIST_HEAD(&entry->list);
807 list_add_tail(&entry->list, &lowpan_devices);
808 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
810 register_netdevice(dev);
815 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
817 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
818 struct net_device *real_dev = lowpan_dev->real_dev;
819 struct lowpan_dev_record *entry;
820 struct lowpan_dev_record *tmp;
824 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
825 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
826 if (entry->ldev == dev) {
827 list_del(&entry->list);
831 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
833 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
835 unregister_netdevice_queue(dev, head);
840 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
842 .priv_size = sizeof(struct lowpan_dev_info),
843 .setup = lowpan_setup,
844 .newlink = lowpan_newlink,
845 .dellink = lowpan_dellink,
846 .validate = lowpan_validate,
849 static inline int __init lowpan_netlink_init(void)
851 return rtnl_link_register(&lowpan_link_ops);
854 static inline void __init lowpan_netlink_fini(void)
856 rtnl_link_unregister(&lowpan_link_ops);
859 static struct packet_type lowpan_packet_type = {
860 .type = __constant_htons(ETH_P_IEEE802154),
864 static int __init lowpan_init_module(void)
868 pr_debug("(%s)\n", __func__);
870 err = lowpan_netlink_init();
874 dev_add_pack(&lowpan_packet_type);
879 static void __exit lowpan_cleanup_module(void)
881 pr_debug("(%s)\n", __func__);
883 lowpan_netlink_fini();
885 dev_remove_pack(&lowpan_packet_type);
888 module_init(lowpan_init_module);
889 module_exit(lowpan_cleanup_module);
890 MODULE_LICENSE("GPL");
891 MODULE_ALIAS_RTNL_LINK("lowpan");