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 <linux/etherdevice.h>
59 #include <net/af_ieee802154.h>
60 #include <net/ieee802154.h>
61 #include <net/ieee802154_netdev.h>
66 /* TTL uncompression values */
67 static const u8 lowpan_ttl_values[] = {0, 1, 64, 255};
69 static LIST_HEAD(lowpan_devices);
72 * Uncompression of linklocal:
73 * 0 -> 16 bytes from packet
74 * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet
75 * 2 -> 2 bytes from prefix - zeroes + 2 from packet
76 * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr
78 * NOTE: => the uncompress function does change 0xf to 0x10
79 * NOTE: 0x00 => no-autoconfig => unspecified
81 static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20};
84 * Uncompression of ctx-based:
85 * 0 -> 0 bits from packet [unspecified / reserved]
86 * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet
87 * 2 -> 8 bytes from prefix - zeroes + 2 from packet
88 * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr
90 static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80};
93 * Uncompression of ctx-base
94 * 0 -> 0 bits from packet
95 * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet
96 * 2 -> 2 bytes from prefix - zeroes + 3 from packet
97 * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr
99 static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
101 /* Link local prefix */
102 static const u8 lowpan_llprefix[] = {0xfe, 0x80};
104 /* private device info */
105 struct lowpan_dev_info {
106 struct net_device *real_dev; /* real WPAN device ptr */
107 struct mutex dev_list_mtx; /* mutex for list ops */
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 spinlock_t lock; /* concurency lock */
118 u16 length; /* length to be assemled */
119 u32 bytes_rcv; /* bytes received */
120 u16 tag; /* current fragment tag */
121 struct timer_list timer; /* assembling timer */
122 struct list_head list; /* fragments list */
125 static unsigned short fragment_tag;
126 static LIST_HEAD(lowpan_fragments);
127 spinlock_t flist_lock;
130 lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
132 return netdev_priv(dev);
135 static inline void lowpan_address_flip(u8 *src, u8 *dest)
138 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
139 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
142 /* list of all 6lowpan devices, uses for package delivering */
143 /* print data in line */
144 static inline void lowpan_raw_dump_inline(const char *caller, char *msg,
145 unsigned char *buf, int len)
149 pr_debug("(%s) %s: ", caller, msg);
150 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE,
151 16, 1, buf, len, false);
156 * print data in a table format:
158 * addr: xx xx xx xx xx xx
159 * addr: xx xx xx xx xx xx
162 static inline void lowpan_raw_dump_table(const char *caller, char *msg,
163 unsigned char *buf, int len)
167 pr_debug("(%s) %s:\n", caller, msg);
168 print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET,
169 16, 1, buf, len, false);
174 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
175 const unsigned char *lladdr)
179 if (is_addr_mac_addr_based(ipaddr, lladdr))
180 val = 3; /* 0-bits */
181 else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
182 /* compress IID to 16 bits xxxx::XXXX */
183 memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
185 val = 2; /* 16-bits */
187 /* do not compress IID => xxxx::IID */
188 memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
190 val = 1; /* 64-bits */
193 return rol8(val, shift);
197 lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr)
199 memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN);
200 /* second bit-flip (Universe/Local) is done according RFC2464 */
201 ipaddr->s6_addr[8] ^= 0x02;
205 * Uncompress addresses based on a prefix and a postfix with zeroes in
206 * between. If the postfix is zero in length it will use the link address
207 * to configure the IP address (autoconf style).
208 * pref_post_count takes a byte where the first nibble specify prefix count
209 * and the second postfix count (NOTE: 15/0xf => 16 bytes copy).
212 lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr,
213 u8 const *prefix, u8 pref_post_count, unsigned char *lladdr)
215 u8 prefcount = pref_post_count >> 4;
216 u8 postcount = pref_post_count & 0x0f;
218 /* full nibble 15 => 16 */
219 prefcount = (prefcount == 15 ? 16 : prefcount);
220 postcount = (postcount == 15 ? 16 : postcount);
223 lowpan_raw_dump_inline(__func__, "linklocal address",
224 lladdr, IEEE802154_ADDR_LEN);
226 memcpy(ipaddr, prefix, prefcount);
228 if (prefcount + postcount < 16)
229 memset(&ipaddr->s6_addr[prefcount], 0,
230 16 - (prefcount + postcount));
233 memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount);
234 skb_pull(skb, postcount);
235 } else if (prefcount > 0) {
239 /* no IID based configuration if no prefix and no data */
240 lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr);
243 pr_debug("uncompressing %d + %d => ", prefcount, postcount);
244 lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
250 lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
252 struct udphdr *uh = udp_hdr(skb);
254 if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
255 LOWPAN_NHC_UDP_4BIT_PORT) &&
256 ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
257 LOWPAN_NHC_UDP_4BIT_PORT)) {
258 pr_debug("UDP header: both ports compression to 4 bits\n");
259 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
260 **(hc06_ptr + 1) = /* subtraction is faster */
261 (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
262 ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
264 } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
265 LOWPAN_NHC_UDP_8BIT_PORT) {
266 pr_debug("UDP header: remove 8 bits of dest\n");
267 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
268 memcpy(*hc06_ptr + 1, &uh->source, 2);
269 **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
271 } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
272 LOWPAN_NHC_UDP_8BIT_PORT) {
273 pr_debug("UDP header: remove 8 bits of source\n");
274 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
275 memcpy(*hc06_ptr + 1, &uh->dest, 2);
276 **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
279 pr_debug("UDP header: can't compress\n");
280 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
281 memcpy(*hc06_ptr + 1, &uh->source, 2);
282 memcpy(*hc06_ptr + 3, &uh->dest, 2);
286 /* checksum is always inline */
287 memcpy(*hc06_ptr, &uh->check, 2);
291 static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
293 if (unlikely(!pskb_may_pull(skb, 1)))
302 static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
304 if (unlikely(!pskb_may_pull(skb, 2)))
307 *val = skb->data[0] | (skb->data[1] << 8);
314 lowpan_uncompress_udp_header(struct sk_buff *skb)
316 struct udphdr *uh = udp_hdr(skb);
319 if (lowpan_fetch_skb_u8(skb, &tmp))
322 if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
323 pr_debug("UDP header uncompression\n");
324 switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
325 case LOWPAN_NHC_UDP_CS_P_00:
326 memcpy(&uh->source, &skb->data[0], 2);
327 memcpy(&uh->dest, &skb->data[2], 2);
330 case LOWPAN_NHC_UDP_CS_P_01:
331 memcpy(&uh->source, &skb->data[0], 2);
333 skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
336 case LOWPAN_NHC_UDP_CS_P_10:
337 uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
338 memcpy(&uh->dest, &skb->data[1], 2);
341 case LOWPAN_NHC_UDP_CS_P_11:
343 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
345 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
349 pr_debug("ERROR: unknown UDP format\n");
354 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
355 uh->source, uh->dest);
358 memcpy(&uh->check, &skb->data[0], 2);
361 pr_debug("ERROR: unsupported NH format\n");
370 static int lowpan_header_create(struct sk_buff *skb,
371 struct net_device *dev,
372 unsigned short type, const void *_daddr,
373 const void *_saddr, unsigned int len)
375 u8 tmp, iphc0, iphc1, *hc06_ptr;
377 const u8 *saddr = _saddr;
378 const u8 *daddr = _daddr;
380 struct ieee802154_addr sa, da;
382 if (type != ETH_P_IPV6)
385 * if this package isn't ipv6 one, where should it be routed?
387 head = kzalloc(100, GFP_KERNEL);
394 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
395 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
396 ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
398 lowpan_raw_dump_table(__func__, "raw skb network header dump",
399 skb_network_header(skb), sizeof(struct ipv6hdr));
402 saddr = dev->dev_addr;
404 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
407 * As we copy some bit-length fields, in the IPHC encoding bytes,
408 * we sometimes use |=
409 * If the field is 0, and the current bit value in memory is 1,
410 * this does not work. We therefore reset the IPHC encoding here
412 iphc0 = LOWPAN_DISPATCH_IPHC;
415 /* TODO: context lookup */
417 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
420 * Traffic class, flow label
421 * If flow label is 0, compress it. If traffic class is 0, compress it
422 * We have to process both in the same time as the offset of traffic
423 * class depends on the presence of version and flow label
426 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
427 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
428 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
430 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
431 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
432 /* flow label can be compressed */
433 iphc0 |= LOWPAN_IPHC_FL_C;
434 if ((hdr->priority == 0) &&
435 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
436 /* compress (elide) all */
437 iphc0 |= LOWPAN_IPHC_TC_C;
439 /* compress only the flow label */
444 /* Flow label cannot be compressed */
445 if ((hdr->priority == 0) &&
446 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
447 /* compress only traffic class */
448 iphc0 |= LOWPAN_IPHC_TC_C;
449 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
450 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
453 /* compress nothing */
454 memcpy(hc06_ptr, &hdr, 4);
455 /* replace the top byte with new ECN | DSCP format */
461 /* NOTE: payload length is always compressed */
463 /* Next Header is compress if UDP */
464 if (hdr->nexthdr == UIP_PROTO_UDP)
465 iphc0 |= LOWPAN_IPHC_NH_C;
467 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
468 *hc06_ptr = hdr->nexthdr;
474 * if 1: compress, encoding is 01
475 * if 64: compress, encoding is 10
476 * if 255: compress, encoding is 11
477 * else do not compress
479 switch (hdr->hop_limit) {
481 iphc0 |= LOWPAN_IPHC_TTL_1;
484 iphc0 |= LOWPAN_IPHC_TTL_64;
487 iphc0 |= LOWPAN_IPHC_TTL_255;
490 *hc06_ptr = hdr->hop_limit;
495 /* source address compression */
496 if (is_addr_unspecified(&hdr->saddr)) {
497 pr_debug("source address is unspecified, setting SAC\n");
498 iphc1 |= LOWPAN_IPHC_SAC;
499 /* TODO: context lookup */
500 } else if (is_addr_link_local(&hdr->saddr)) {
501 pr_debug("source address is link-local\n");
502 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
503 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
505 pr_debug("send the full source address\n");
506 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
510 /* destination address compression */
511 if (is_addr_mcast(&hdr->daddr)) {
512 pr_debug("destination address is multicast: ");
513 iphc1 |= LOWPAN_IPHC_M;
514 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
515 pr_debug("compressed to 1 octet\n");
516 iphc1 |= LOWPAN_IPHC_DAM_11;
518 *hc06_ptr = hdr->daddr.s6_addr[15];
520 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
521 pr_debug("compressed to 4 octets\n");
522 iphc1 |= LOWPAN_IPHC_DAM_10;
523 /* second byte + the last three */
524 *hc06_ptr = hdr->daddr.s6_addr[1];
525 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
527 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
528 pr_debug("compressed to 6 octets\n");
529 iphc1 |= LOWPAN_IPHC_DAM_01;
530 /* second byte + the last five */
531 *hc06_ptr = hdr->daddr.s6_addr[1];
532 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
535 pr_debug("using full address\n");
536 iphc1 |= LOWPAN_IPHC_DAM_00;
537 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
541 /* TODO: context lookup */
542 if (is_addr_link_local(&hdr->daddr)) {
543 pr_debug("dest address is unicast and link-local\n");
544 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
545 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
547 pr_debug("dest address is unicast: using full one\n");
548 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
553 /* UDP header compression */
554 if (hdr->nexthdr == UIP_PROTO_UDP)
555 lowpan_compress_udp_header(&hc06_ptr, skb);
560 skb_pull(skb, sizeof(struct ipv6hdr));
561 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
565 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
569 * NOTE1: I'm still unsure about the fact that compression and WPAN
570 * header are created here and not later in the xmit. So wait for
571 * an opinion of net maintainers.
574 * NOTE2: to be absolutely correct, we must derive PANid information
575 * from MAC subif of the 'dev' and 'real_dev' network devices, but
576 * this isn't implemented in mainline yet, so currently we assign 0xff
579 /* prepare wpan address data */
580 sa.addr_type = IEEE802154_ADDR_LONG;
583 da.addr_type = IEEE802154_ADDR_LONG;
586 memcpy(&(da.hwaddr), daddr, 8);
587 memcpy(&(sa.hwaddr), saddr, 8);
589 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
591 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
592 type, (void *)&da, (void *)&sa, skb->len);
596 static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
599 struct lowpan_dev_record *entry;
600 int stat = NET_RX_SUCCESS;
602 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
609 skb_push(new, sizeof(struct ipv6hdr));
610 skb_reset_network_header(new);
611 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
613 new->protocol = htons(ETH_P_IPV6);
614 new->pkt_type = PACKET_HOST;
617 list_for_each_entry_rcu(entry, &lowpan_devices, list)
618 if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
619 skb = skb_copy(new, GFP_ATOMIC);
625 skb->dev = entry->ldev;
626 stat = netif_rx(skb);
635 static void lowpan_fragment_timer_expired(unsigned long entry_addr)
637 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
639 pr_debug("timer expired for frame with tag %d\n", entry->tag);
641 spin_lock(&flist_lock);
642 list_del(&entry->list);
643 spin_unlock(&flist_lock);
645 dev_kfree_skb(entry->skb);
649 static struct lowpan_fragment *
650 lowpan_alloc_new_frame(struct sk_buff *skb, u8 iphc0, u8 len, u8 tag)
652 struct lowpan_fragment *frame;
654 frame = kzalloc(sizeof(struct lowpan_fragment),
659 INIT_LIST_HEAD(&frame->list);
661 frame->length = (iphc0 & 7) | (len << 3);
664 /* allocate buffer for frame assembling */
665 frame->skb = alloc_skb(frame->length +
666 sizeof(struct ipv6hdr), GFP_ATOMIC);
671 frame->skb->priority = skb->priority;
672 frame->skb->dev = skb->dev;
674 /* reserve headroom for uncompressed ipv6 header */
675 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
676 skb_put(frame->skb, frame->length);
678 init_timer(&frame->timer);
679 /* time out is the same as for ipv6 - 60 sec */
680 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
681 frame->timer.data = (unsigned long)frame;
682 frame->timer.function = lowpan_fragment_timer_expired;
684 add_timer(&frame->timer);
686 list_add_tail(&frame->list, &lowpan_fragments);
697 lowpan_process_data(struct sk_buff *skb)
700 u8 tmp, iphc0, iphc1, num_context = 0;
704 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
706 /* at least two bytes will be used for the encoding */
710 if (lowpan_fetch_skb_u8(skb, &iphc0))
713 /* fragments assembling */
714 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
715 case LOWPAN_DISPATCH_FRAG1:
716 case LOWPAN_DISPATCH_FRAGN:
718 struct lowpan_fragment *frame;
723 if (lowpan_fetch_skb_u8(skb, &len) || /* frame length */
724 lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
728 * check if frame assembling with the same tag is
729 * already in progress
731 spin_lock(&flist_lock);
733 list_for_each_entry(frame, &lowpan_fragments, list)
734 if (frame->tag == tag) {
739 /* alloc new frame structure */
741 frame = lowpan_alloc_new_frame(skb, iphc0, len, tag);
743 goto unlock_and_drop;
746 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
747 goto unlock_and_drop;
749 if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */
750 goto unlock_and_drop;
752 /* if payload fits buffer, copy it */
753 if (likely((offset * 8 + skb->len) <= frame->length))
754 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
755 skb->data, skb->len);
757 goto unlock_and_drop;
759 frame->bytes_rcv += skb->len;
761 /* frame assembling complete */
762 if ((frame->bytes_rcv == frame->length) &&
763 frame->timer.expires > jiffies) {
764 /* if timer haven't expired - first of all delete it */
765 del_timer(&frame->timer);
766 list_del(&frame->list);
767 spin_unlock(&flist_lock);
773 if (lowpan_fetch_skb_u8(skb, &iphc0))
778 spin_unlock(&flist_lock);
780 return kfree_skb(skb), 0;
786 if (lowpan_fetch_skb_u8(skb, &iphc1))
789 _saddr = mac_cb(skb)->sa.hwaddr;
790 _daddr = mac_cb(skb)->da.hwaddr;
792 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
794 /* another if the CID flag is set */
795 if (iphc1 & LOWPAN_IPHC_CID) {
796 pr_debug("CID flag is set, increase header with one\n");
797 if (lowpan_fetch_skb_u8(skb, &num_context))
803 /* Traffic Class and Flow Label */
804 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
806 * Traffic Class and FLow Label carried in-line
807 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
810 if (lowpan_fetch_skb_u8(skb, &tmp))
813 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
815 hdr.priority = ((tmp >> 2) & 0x0f);
816 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
817 (hdr.flow_lbl[0] & 0x0f);
820 * Traffic class carried in-line
821 * ECN + DSCP (1 byte), Flow Label is elided
824 if (lowpan_fetch_skb_u8(skb, &tmp))
827 hdr.priority = ((tmp >> 2) & 0x0f);
828 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
833 * Flow Label carried in-line
834 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
837 if (lowpan_fetch_skb_u8(skb, &tmp))
840 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
841 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
844 /* Traffic Class and Flow Label are elided */
856 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
857 /* Next header is carried inline */
858 if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
861 pr_debug("NH flag is set, next header carried inline: %02x\n",
866 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
867 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
869 if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
873 /* Extract SAM to the tmp variable */
874 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
876 /* Source address uncompression */
877 pr_debug("source address stateless compression\n");
878 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
879 lowpan_unc_llconf[tmp], skb->data);
883 /* Extract DAM to the tmp variable */
884 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
886 /* check for Multicast Compression */
887 if (iphc1 & LOWPAN_IPHC_M) {
888 if (iphc1 & LOWPAN_IPHC_DAC) {
889 pr_debug("dest: context-based mcast compression\n");
890 /* TODO: implement this */
892 u8 prefix[] = {0xff, 0x02};
894 pr_debug("dest: non context-based mcast compression\n");
895 if (0 < tmp && tmp < 3) {
896 if (lowpan_fetch_skb_u8(skb, &prefix[1]))
900 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
901 lowpan_unc_mxconf[tmp], NULL);
906 pr_debug("dest: stateless compression\n");
907 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
908 lowpan_unc_llconf[tmp], skb->data);
913 /* UDP data uncompression */
914 if (iphc0 & LOWPAN_IPHC_NH_C)
915 if (lowpan_uncompress_udp_header(skb))
918 /* Not fragmented package */
919 hdr.payload_len = htons(skb->len);
921 pr_debug("skb headroom size = %d, data length = %d\n",
922 skb_headroom(skb), skb->len);
924 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
925 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
926 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
928 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
930 return lowpan_skb_deliver(skb, &hdr);
933 spin_unlock(&flist_lock);
939 static int lowpan_get_mac_header_length(struct sk_buff *skb)
942 * Currently long addressing mode is supported only, so the overall
944 * FC SeqNum DPAN DA SA Sec
945 * 2 + 1 + 2 + 8 + 8 + 0 = 21
951 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
952 int mlen, int plen, int offset)
954 struct sk_buff *frag;
957 /* if payload length is zero, therefore it's a first fragment */
958 hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
960 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
962 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
966 frag->priority = skb->priority;
967 frag->dev = skb->dev;
969 /* copy header, MFR and payload */
970 memcpy(skb_put(frag, mlen), skb->data, mlen);
971 memcpy(skb_put(frag, hlen), head, hlen);
974 skb_copy_from_linear_data_offset(skb, offset + mlen,
975 skb_put(frag, plen), plen);
977 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
980 ret = dev_queue_xmit(frag);
986 lowpan_skb_fragmentation(struct sk_buff *skb)
988 int err, header_length, payload_length, tag, offset = 0;
991 header_length = lowpan_get_mac_header_length(skb);
992 payload_length = skb->len - header_length;
993 tag = fragment_tag++;
995 /* first fragment header */
996 head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7);
997 head[1] = (payload_length >> 3) & 0xff;
998 head[2] = tag & 0xff;
1001 err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
1003 /* next fragment header */
1004 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1005 head[0] |= LOWPAN_DISPATCH_FRAGN;
1007 while ((payload_length - offset > 0) && (err >= 0)) {
1008 int len = LOWPAN_FRAG_SIZE;
1010 head[4] = offset / 8;
1012 if (payload_length - offset < len)
1013 len = payload_length - offset;
1015 err = lowpan_fragment_xmit(skb, head, header_length,
1023 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1027 pr_debug("package xmit\n");
1029 skb->dev = lowpan_dev_info(dev)->real_dev;
1030 if (skb->dev == NULL) {
1031 pr_debug("ERROR: no real wpan device found\n");
1035 if (skb->len <= IEEE802154_MTU) {
1036 err = dev_queue_xmit(skb);
1040 pr_debug("frame is too big, fragmentation is needed\n");
1041 err = lowpan_skb_fragmentation(skb);
1046 pr_debug("ERROR: xmit failed\n");
1048 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
1051 static void lowpan_dev_free(struct net_device *dev)
1053 dev_put(lowpan_dev_info(dev)->real_dev);
1057 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
1059 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1060 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
1063 static u16 lowpan_get_pan_id(const struct net_device *dev)
1065 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1066 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
1069 static u16 lowpan_get_short_addr(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_short_addr(real_dev);
1075 static struct header_ops lowpan_header_ops = {
1076 .create = lowpan_header_create,
1079 static const struct net_device_ops lowpan_netdev_ops = {
1080 .ndo_start_xmit = lowpan_xmit,
1081 .ndo_set_mac_address = eth_mac_addr,
1084 static struct ieee802154_mlme_ops lowpan_mlme = {
1085 .get_pan_id = lowpan_get_pan_id,
1086 .get_phy = lowpan_get_phy,
1087 .get_short_addr = lowpan_get_short_addr,
1090 static void lowpan_setup(struct net_device *dev)
1092 dev->addr_len = IEEE802154_ADDR_LEN;
1093 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1094 dev->type = ARPHRD_IEEE802154;
1095 /* Frame Control + Sequence Number + Address fields + Security Header */
1096 dev->hard_header_len = 2 + 1 + 20 + 14;
1097 dev->needed_tailroom = 2; /* FCS */
1099 dev->tx_queue_len = 0;
1100 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
1101 dev->watchdog_timeo = 0;
1103 dev->netdev_ops = &lowpan_netdev_ops;
1104 dev->header_ops = &lowpan_header_ops;
1105 dev->ml_priv = &lowpan_mlme;
1106 dev->destructor = lowpan_dev_free;
1109 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1111 if (tb[IFLA_ADDRESS]) {
1112 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1118 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1119 struct packet_type *pt, struct net_device *orig_dev)
1121 if (!netif_running(dev))
1124 if (dev->type != ARPHRD_IEEE802154)
1127 /* check that it's our buffer */
1128 switch (skb->data[0] & 0xe0) {
1129 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1130 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1131 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
1132 lowpan_process_data(skb);
1138 return NET_RX_SUCCESS;
1145 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1146 struct nlattr *tb[], struct nlattr *data[])
1148 struct net_device *real_dev;
1149 struct lowpan_dev_record *entry;
1151 pr_debug("adding new link\n");
1155 /* find and hold real wpan device */
1156 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1160 lowpan_dev_info(dev)->real_dev = real_dev;
1161 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1163 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
1166 lowpan_dev_info(dev)->real_dev = NULL;
1172 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1173 INIT_LIST_HEAD(&entry->list);
1174 list_add_tail(&entry->list, &lowpan_devices);
1175 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1177 spin_lock_init(&flist_lock);
1179 register_netdevice(dev);
1184 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1186 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1187 struct net_device *real_dev = lowpan_dev->real_dev;
1188 struct lowpan_dev_record *entry, *tmp;
1189 struct lowpan_fragment *frame, *tframe;
1193 spin_lock(&flist_lock);
1194 list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
1195 del_timer(&frame->timer);
1196 list_del(&frame->list);
1197 dev_kfree_skb(frame->skb);
1200 spin_unlock(&flist_lock);
1202 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1203 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1204 if (entry->ldev == dev) {
1205 list_del(&entry->list);
1209 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1211 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1213 unregister_netdevice_queue(dev, head);
1218 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1220 .priv_size = sizeof(struct lowpan_dev_info),
1221 .setup = lowpan_setup,
1222 .newlink = lowpan_newlink,
1223 .dellink = lowpan_dellink,
1224 .validate = lowpan_validate,
1227 static inline int __init lowpan_netlink_init(void)
1229 return rtnl_link_register(&lowpan_link_ops);
1232 static inline void __init lowpan_netlink_fini(void)
1234 rtnl_link_unregister(&lowpan_link_ops);
1237 static struct packet_type lowpan_packet_type = {
1238 .type = __constant_htons(ETH_P_IEEE802154),
1242 static int __init lowpan_init_module(void)
1246 err = lowpan_netlink_init();
1250 dev_add_pack(&lowpan_packet_type);
1255 static void __exit lowpan_cleanup_module(void)
1257 lowpan_netlink_fini();
1259 dev_remove_pack(&lowpan_packet_type);
1262 module_init(lowpan_init_module);
1263 module_exit(lowpan_cleanup_module);
1264 MODULE_LICENSE("GPL");
1265 MODULE_ALIAS_RTNL_LINK("lowpan");