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 static DEFINE_SPINLOCK(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_ADDR_LEN);
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_ADDR_LEN);
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("uncompressing %d + %d => ", prefcount, postcount);
243 lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
249 lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
251 struct udphdr *uh = udp_hdr(skb);
253 if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
254 LOWPAN_NHC_UDP_4BIT_PORT) &&
255 ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
256 LOWPAN_NHC_UDP_4BIT_PORT)) {
257 pr_debug("UDP header: both ports compression to 4 bits\n");
258 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
259 **(hc06_ptr + 1) = /* subtraction is faster */
260 (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
261 ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
263 } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
264 LOWPAN_NHC_UDP_8BIT_PORT) {
265 pr_debug("UDP header: remove 8 bits of dest\n");
266 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
267 memcpy(*hc06_ptr + 1, &uh->source, 2);
268 **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
270 } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
271 LOWPAN_NHC_UDP_8BIT_PORT) {
272 pr_debug("UDP header: remove 8 bits of source\n");
273 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
274 memcpy(*hc06_ptr + 1, &uh->dest, 2);
275 **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
278 pr_debug("UDP header: can't compress\n");
279 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
280 memcpy(*hc06_ptr + 1, &uh->source, 2);
281 memcpy(*hc06_ptr + 3, &uh->dest, 2);
285 /* checksum is always inline */
286 memcpy(*hc06_ptr, &uh->check, 2);
290 static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
292 if (unlikely(!pskb_may_pull(skb, 1)))
301 static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
303 if (unlikely(!pskb_may_pull(skb, 2)))
306 *val = skb->data[0] | (skb->data[1] << 8);
313 lowpan_uncompress_udp_header(struct sk_buff *skb)
315 struct udphdr *uh = udp_hdr(skb);
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);
360 pr_debug("ERROR: unsupported NH format\n");
369 static int lowpan_header_create(struct sk_buff *skb,
370 struct net_device *dev,
371 unsigned short type, const void *_daddr,
372 const void *_saddr, unsigned int len)
374 u8 tmp, iphc0, iphc1, *hc06_ptr;
376 const u8 *saddr = _saddr;
377 const u8 *daddr = _daddr;
379 struct ieee802154_addr sa, da;
381 if (type != ETH_P_IPV6)
384 * if this package isn't ipv6 one, where should it be routed?
386 head = kzalloc(100, GFP_KERNEL);
393 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
394 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
395 ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
397 lowpan_raw_dump_table(__func__, "raw skb network header dump",
398 skb_network_header(skb), sizeof(struct ipv6hdr));
401 saddr = dev->dev_addr;
403 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
406 * As we copy some bit-length fields, in the IPHC encoding bytes,
407 * we sometimes use |=
408 * If the field is 0, and the current bit value in memory is 1,
409 * this does not work. We therefore reset the IPHC encoding here
411 iphc0 = LOWPAN_DISPATCH_IPHC;
414 /* TODO: context lookup */
416 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
419 * Traffic class, flow label
420 * If flow label is 0, compress it. If traffic class is 0, compress it
421 * We have to process both in the same time as the offset of traffic
422 * class depends on the presence of version and flow label
425 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
426 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
427 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
429 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
430 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
431 /* flow label can be compressed */
432 iphc0 |= LOWPAN_IPHC_FL_C;
433 if ((hdr->priority == 0) &&
434 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
435 /* compress (elide) all */
436 iphc0 |= LOWPAN_IPHC_TC_C;
438 /* compress only the flow label */
443 /* Flow label cannot be compressed */
444 if ((hdr->priority == 0) &&
445 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
446 /* compress only traffic class */
447 iphc0 |= LOWPAN_IPHC_TC_C;
448 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
449 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
452 /* compress nothing */
453 memcpy(hc06_ptr, &hdr, 4);
454 /* replace the top byte with new ECN | DSCP format */
460 /* NOTE: payload length is always compressed */
462 /* Next Header is compress if UDP */
463 if (hdr->nexthdr == UIP_PROTO_UDP)
464 iphc0 |= LOWPAN_IPHC_NH_C;
466 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
467 *hc06_ptr = hdr->nexthdr;
473 * if 1: compress, encoding is 01
474 * if 64: compress, encoding is 10
475 * if 255: compress, encoding is 11
476 * else do not compress
478 switch (hdr->hop_limit) {
480 iphc0 |= LOWPAN_IPHC_TTL_1;
483 iphc0 |= LOWPAN_IPHC_TTL_64;
486 iphc0 |= LOWPAN_IPHC_TTL_255;
489 *hc06_ptr = hdr->hop_limit;
494 /* source address compression */
495 if (is_addr_unspecified(&hdr->saddr)) {
496 pr_debug("source address is unspecified, setting SAC\n");
497 iphc1 |= LOWPAN_IPHC_SAC;
498 /* TODO: context lookup */
499 } else if (is_addr_link_local(&hdr->saddr)) {
500 pr_debug("source address is link-local\n");
501 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
502 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
504 pr_debug("send the full source address\n");
505 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
509 /* destination address compression */
510 if (is_addr_mcast(&hdr->daddr)) {
511 pr_debug("destination address is multicast: ");
512 iphc1 |= LOWPAN_IPHC_M;
513 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
514 pr_debug("compressed to 1 octet\n");
515 iphc1 |= LOWPAN_IPHC_DAM_11;
517 *hc06_ptr = hdr->daddr.s6_addr[15];
519 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
520 pr_debug("compressed to 4 octets\n");
521 iphc1 |= LOWPAN_IPHC_DAM_10;
522 /* second byte + the last three */
523 *hc06_ptr = hdr->daddr.s6_addr[1];
524 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
526 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
527 pr_debug("compressed to 6 octets\n");
528 iphc1 |= LOWPAN_IPHC_DAM_01;
529 /* second byte + the last five */
530 *hc06_ptr = hdr->daddr.s6_addr[1];
531 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
534 pr_debug("using full address\n");
535 iphc1 |= LOWPAN_IPHC_DAM_00;
536 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
540 /* TODO: context lookup */
541 if (is_addr_link_local(&hdr->daddr)) {
542 pr_debug("dest address is unicast and link-local\n");
543 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
544 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
546 pr_debug("dest address is unicast: using full one\n");
547 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
552 /* UDP header compression */
553 if (hdr->nexthdr == UIP_PROTO_UDP)
554 lowpan_compress_udp_header(&hc06_ptr, skb);
559 skb_pull(skb, sizeof(struct ipv6hdr));
560 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
564 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
568 * NOTE1: I'm still unsure about the fact that compression and WPAN
569 * header are created here and not later in the xmit. So wait for
570 * an opinion of net maintainers.
573 * NOTE2: to be absolutely correct, we must derive PANid information
574 * from MAC subif of the 'dev' and 'real_dev' network devices, but
575 * this isn't implemented in mainline yet, so currently we assign 0xff
578 /* prepare wpan address data */
579 sa.addr_type = IEEE802154_ADDR_LONG;
582 da.addr_type = IEEE802154_ADDR_LONG;
585 memcpy(&(da.hwaddr), daddr, 8);
586 memcpy(&(sa.hwaddr), saddr, 8);
588 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
590 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
591 type, (void *)&da, (void *)&sa, skb->len);
595 static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
598 struct lowpan_dev_record *entry;
599 int stat = NET_RX_SUCCESS;
601 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
608 skb_push(new, sizeof(struct ipv6hdr));
609 skb_reset_network_header(new);
610 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
612 new->protocol = htons(ETH_P_IPV6);
613 new->pkt_type = PACKET_HOST;
616 list_for_each_entry_rcu(entry, &lowpan_devices, list)
617 if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
618 skb = skb_copy(new, GFP_ATOMIC);
624 skb->dev = entry->ldev;
625 stat = netif_rx(skb);
634 static void lowpan_fragment_timer_expired(unsigned long entry_addr)
636 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
638 pr_debug("timer expired for frame with tag %d\n", entry->tag);
640 spin_lock(&flist_lock);
641 list_del(&entry->list);
642 spin_unlock(&flist_lock);
644 dev_kfree_skb(entry->skb);
648 static struct lowpan_fragment *
649 lowpan_alloc_new_frame(struct sk_buff *skb, u8 iphc0, u8 len, u16 tag)
651 struct lowpan_fragment *frame;
653 frame = kzalloc(sizeof(struct lowpan_fragment),
658 INIT_LIST_HEAD(&frame->list);
660 frame->length = (iphc0 & 7) | (len << 3);
663 /* allocate buffer for frame assembling */
664 frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length +
665 sizeof(struct ipv6hdr));
670 frame->skb->priority = skb->priority;
671 frame->skb->dev = skb->dev;
673 /* reserve headroom for uncompressed ipv6 header */
674 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
675 skb_put(frame->skb, frame->length);
677 init_timer(&frame->timer);
678 /* time out is the same as for ipv6 - 60 sec */
679 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
680 frame->timer.data = (unsigned long)frame;
681 frame->timer.function = lowpan_fragment_timer_expired;
683 add_timer(&frame->timer);
685 list_add_tail(&frame->list, &lowpan_fragments);
696 lowpan_process_data(struct sk_buff *skb)
699 u8 tmp, iphc0, iphc1, num_context = 0;
703 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
705 /* at least two bytes will be used for the encoding */
709 if (lowpan_fetch_skb_u8(skb, &iphc0))
712 /* fragments assembling */
713 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
714 case LOWPAN_DISPATCH_FRAG1:
715 case LOWPAN_DISPATCH_FRAGN:
717 struct lowpan_fragment *frame;
722 if (lowpan_fetch_skb_u8(skb, &len) || /* frame length */
723 lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
727 * check if frame assembling with the same tag is
728 * already in progress
730 spin_lock(&flist_lock);
732 list_for_each_entry(frame, &lowpan_fragments, list)
733 if (frame->tag == tag) {
738 /* alloc new frame structure */
740 frame = lowpan_alloc_new_frame(skb, iphc0, len, tag);
742 goto unlock_and_drop;
745 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
746 goto unlock_and_drop;
748 if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */
749 goto unlock_and_drop;
751 /* if payload fits buffer, copy it */
752 if (likely((offset * 8 + skb->len) <= frame->length))
753 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
754 skb->data, skb->len);
756 goto unlock_and_drop;
758 frame->bytes_rcv += skb->len;
760 /* frame assembling complete */
761 if ((frame->bytes_rcv == frame->length) &&
762 frame->timer.expires > jiffies) {
763 /* if timer haven't expired - first of all delete it */
764 del_timer(&frame->timer);
765 list_del(&frame->list);
766 spin_unlock(&flist_lock);
772 if (lowpan_fetch_skb_u8(skb, &iphc0))
777 spin_unlock(&flist_lock);
779 return kfree_skb(skb), 0;
785 if (lowpan_fetch_skb_u8(skb, &iphc1))
788 _saddr = mac_cb(skb)->sa.hwaddr;
789 _daddr = mac_cb(skb)->da.hwaddr;
791 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
793 /* another if the CID flag is set */
794 if (iphc1 & LOWPAN_IPHC_CID) {
795 pr_debug("CID flag is set, increase header with one\n");
796 if (lowpan_fetch_skb_u8(skb, &num_context))
802 /* Traffic Class and Flow Label */
803 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
805 * Traffic Class and FLow Label carried in-line
806 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
809 if (lowpan_fetch_skb_u8(skb, &tmp))
812 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
814 hdr.priority = ((tmp >> 2) & 0x0f);
815 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
816 (hdr.flow_lbl[0] & 0x0f);
819 * Traffic class carried in-line
820 * ECN + DSCP (1 byte), Flow Label is elided
823 if (lowpan_fetch_skb_u8(skb, &tmp))
826 hdr.priority = ((tmp >> 2) & 0x0f);
827 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
832 * Flow Label carried in-line
833 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
836 if (lowpan_fetch_skb_u8(skb, &tmp))
839 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
840 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
843 /* Traffic Class and Flow Label are elided */
855 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
856 /* Next header is carried inline */
857 if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
860 pr_debug("NH flag is set, next header carried inline: %02x\n",
865 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
866 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
868 if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
872 /* Extract SAM to the tmp variable */
873 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
875 /* Source address uncompression */
876 pr_debug("source address stateless compression\n");
877 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
878 lowpan_unc_llconf[tmp], skb->data);
882 /* Extract DAM to the tmp variable */
883 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
885 /* check for Multicast Compression */
886 if (iphc1 & LOWPAN_IPHC_M) {
887 if (iphc1 & LOWPAN_IPHC_DAC) {
888 pr_debug("dest: context-based mcast compression\n");
889 /* TODO: implement this */
891 u8 prefix[] = {0xff, 0x02};
893 pr_debug("dest: non context-based mcast compression\n");
894 if (0 < tmp && tmp < 3) {
895 if (lowpan_fetch_skb_u8(skb, &prefix[1]))
899 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
900 lowpan_unc_mxconf[tmp], NULL);
905 pr_debug("dest: stateless compression\n");
906 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
907 lowpan_unc_llconf[tmp], skb->data);
912 /* UDP data uncompression */
913 if (iphc0 & LOWPAN_IPHC_NH_C)
914 if (lowpan_uncompress_udp_header(skb))
917 /* Not fragmented package */
918 hdr.payload_len = htons(skb->len);
920 pr_debug("skb headroom size = %d, data length = %d\n",
921 skb_headroom(skb), skb->len);
923 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
924 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
925 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
927 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
929 return lowpan_skb_deliver(skb, &hdr);
932 spin_unlock(&flist_lock);
938 static int lowpan_set_address(struct net_device *dev, void *p)
940 struct sockaddr *sa = p;
942 if (netif_running(dev))
945 /* TODO: validate addr */
946 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
951 static int lowpan_get_mac_header_length(struct sk_buff *skb)
954 * Currently long addressing mode is supported only, so the overall
956 * FC SeqNum DPAN DA SA Sec
957 * 2 + 1 + 2 + 8 + 8 + 0 = 21
963 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
964 int mlen, int plen, int offset)
966 struct sk_buff *frag;
969 /* if payload length is zero, therefore it's a first fragment */
970 hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
972 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
974 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
978 frag->priority = skb->priority;
979 frag->dev = skb->dev;
981 /* copy header, MFR and payload */
982 memcpy(skb_put(frag, mlen), skb->data, mlen);
983 memcpy(skb_put(frag, hlen), head, hlen);
986 skb_copy_from_linear_data_offset(skb, offset + mlen,
987 skb_put(frag, plen), plen);
989 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
992 ret = dev_queue_xmit(frag);
998 lowpan_skb_fragmentation(struct sk_buff *skb)
1000 int err, header_length, payload_length, tag, offset = 0;
1003 header_length = lowpan_get_mac_header_length(skb);
1004 payload_length = skb->len - header_length;
1005 tag = fragment_tag++;
1007 /* first fragment header */
1008 head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7);
1009 head[1] = (payload_length >> 3) & 0xff;
1010 head[2] = tag & 0xff;
1013 err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
1015 /* next fragment header */
1016 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1017 head[0] |= LOWPAN_DISPATCH_FRAGN;
1019 while ((payload_length - offset > 0) && (err >= 0)) {
1020 int len = LOWPAN_FRAG_SIZE;
1022 head[4] = offset / 8;
1024 if (payload_length - offset < len)
1025 len = payload_length - offset;
1027 err = lowpan_fragment_xmit(skb, head, header_length,
1035 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1039 pr_debug("package xmit\n");
1041 skb->dev = lowpan_dev_info(dev)->real_dev;
1042 if (skb->dev == NULL) {
1043 pr_debug("ERROR: no real wpan device found\n");
1047 if (skb->len <= IEEE802154_MTU) {
1048 err = dev_queue_xmit(skb);
1052 pr_debug("frame is too big, fragmentation is needed\n");
1053 err = lowpan_skb_fragmentation(skb);
1058 pr_debug("ERROR: xmit failed\n");
1060 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
1063 static void lowpan_dev_free(struct net_device *dev)
1065 dev_put(lowpan_dev_info(dev)->real_dev);
1069 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
1071 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1072 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
1075 static u16 lowpan_get_pan_id(const struct net_device *dev)
1077 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1078 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
1081 static u16 lowpan_get_short_addr(const struct net_device *dev)
1083 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1084 return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
1087 static struct header_ops lowpan_header_ops = {
1088 .create = lowpan_header_create,
1091 static const struct net_device_ops lowpan_netdev_ops = {
1092 .ndo_start_xmit = lowpan_xmit,
1093 .ndo_set_mac_address = lowpan_set_address,
1096 static struct ieee802154_mlme_ops lowpan_mlme = {
1097 .get_pan_id = lowpan_get_pan_id,
1098 .get_phy = lowpan_get_phy,
1099 .get_short_addr = lowpan_get_short_addr,
1102 static void lowpan_setup(struct net_device *dev)
1104 dev->addr_len = IEEE802154_ADDR_LEN;
1105 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1106 dev->type = ARPHRD_IEEE802154;
1107 /* Frame Control + Sequence Number + Address fields + Security Header */
1108 dev->hard_header_len = 2 + 1 + 20 + 14;
1109 dev->needed_tailroom = 2; /* FCS */
1111 dev->tx_queue_len = 0;
1112 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
1113 dev->watchdog_timeo = 0;
1115 dev->netdev_ops = &lowpan_netdev_ops;
1116 dev->header_ops = &lowpan_header_ops;
1117 dev->ml_priv = &lowpan_mlme;
1118 dev->destructor = lowpan_dev_free;
1121 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1123 if (tb[IFLA_ADDRESS]) {
1124 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1130 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1131 struct packet_type *pt, struct net_device *orig_dev)
1133 if (!netif_running(dev))
1136 if (dev->type != ARPHRD_IEEE802154)
1139 /* check that it's our buffer */
1140 switch (skb->data[0] & 0xe0) {
1141 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1142 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1143 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
1144 lowpan_process_data(skb);
1150 return NET_RX_SUCCESS;
1157 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1158 struct nlattr *tb[], struct nlattr *data[])
1160 struct net_device *real_dev;
1161 struct lowpan_dev_record *entry;
1163 pr_debug("adding new link\n");
1167 /* find and hold real wpan device */
1168 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1172 lowpan_dev_info(dev)->real_dev = real_dev;
1173 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1175 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
1178 lowpan_dev_info(dev)->real_dev = NULL;
1184 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1185 INIT_LIST_HEAD(&entry->list);
1186 list_add_tail(&entry->list, &lowpan_devices);
1187 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1189 register_netdevice(dev);
1194 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1196 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1197 struct net_device *real_dev = lowpan_dev->real_dev;
1198 struct lowpan_dev_record *entry, *tmp;
1199 struct lowpan_fragment *frame, *tframe;
1203 spin_lock(&flist_lock);
1204 list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
1205 del_timer(&frame->timer);
1206 list_del(&frame->list);
1207 dev_kfree_skb(frame->skb);
1210 spin_unlock(&flist_lock);
1212 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1213 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1214 if (entry->ldev == dev) {
1215 list_del(&entry->list);
1219 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1221 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1223 unregister_netdevice_queue(dev, head);
1228 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1230 .priv_size = sizeof(struct lowpan_dev_info),
1231 .setup = lowpan_setup,
1232 .newlink = lowpan_newlink,
1233 .dellink = lowpan_dellink,
1234 .validate = lowpan_validate,
1237 static inline int __init lowpan_netlink_init(void)
1239 return rtnl_link_register(&lowpan_link_ops);
1242 static inline void __init lowpan_netlink_fini(void)
1244 rtnl_link_unregister(&lowpan_link_ops);
1247 static struct packet_type lowpan_packet_type = {
1248 .type = __constant_htons(ETH_P_IEEE802154),
1252 static int __init lowpan_init_module(void)
1256 err = lowpan_netlink_init();
1260 dev_add_pack(&lowpan_packet_type);
1265 static void __exit lowpan_cleanup_module(void)
1267 lowpan_netlink_fini();
1269 dev_remove_pack(&lowpan_packet_type);
1272 module_init(lowpan_init_module);
1273 module_exit(lowpan_cleanup_module);
1274 MODULE_LICENSE("GPL");
1275 MODULE_ALIAS_RTNL_LINK("lowpan");