1 /* Copyright 2011, Siemens AG
2 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
5 /* Based on patches from Jon Smirl <jonsmirl@gmail.com>
6 * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 /* Jon's code is based on 6lowpan implementation for Contiki which is:
19 * Copyright (c) 2008, Swedish Institute of Computer Science.
20 * All rights reserved.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. Neither the name of the Institute nor the names of its contributors
31 * may be used to endorse or promote products derived from this software
32 * without specific prior written permission.
34 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
35 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
38 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 #include <linux/bitops.h>
48 #include <linux/if_arp.h>
49 #include <linux/module.h>
50 #include <linux/moduleparam.h>
51 #include <linux/netdevice.h>
52 #include <net/af_ieee802154.h>
53 #include <net/ieee802154.h>
54 #include <net/ieee802154_netdev.h>
55 #include <net/6lowpan.h>
58 #include "reassembly.h"
60 static LIST_HEAD(lowpan_devices);
62 /* private device info */
63 struct lowpan_dev_info {
64 struct net_device *real_dev; /* real WPAN device ptr */
65 struct mutex dev_list_mtx; /* mutex for list ops */
69 struct lowpan_dev_record {
70 struct net_device *ldev;
71 struct list_head list;
75 lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
77 return netdev_priv(dev);
80 static inline void lowpan_address_flip(u8 *src, u8 *dest)
83 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
84 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
87 static int lowpan_header_create(struct sk_buff *skb,
88 struct net_device *dev,
89 unsigned short type, const void *_daddr,
90 const void *_saddr, unsigned int len)
92 const u8 *saddr = _saddr;
93 const u8 *daddr = _daddr;
94 struct ieee802154_addr sa, da;
97 * if this package isn't ipv6 one, where should it be routed?
99 if (type != ETH_P_IPV6)
103 saddr = dev->dev_addr;
105 raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
106 raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
108 lowpan_header_compress(skb, dev, type, daddr, saddr, len);
110 /* NOTE1: I'm still unsure about the fact that compression and WPAN
111 * header are created here and not later in the xmit. So wait for
112 * an opinion of net maintainers.
114 /* NOTE2: to be absolutely correct, we must derive PANid information
115 * from MAC subif of the 'dev' and 'real_dev' network devices, but
116 * this isn't implemented in mainline yet, so currently we assign 0xff
118 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
119 mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
121 /* prepare wpan address data */
122 sa.mode = IEEE802154_ADDR_LONG;
123 sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
124 sa.extended_addr = ieee802154_devaddr_from_raw(saddr);
126 /* intra-PAN communications */
127 da.pan_id = sa.pan_id;
129 /* if the destination address is the broadcast address, use the
130 * corresponding short address
132 if (lowpan_is_addr_broadcast(daddr)) {
133 da.mode = IEEE802154_ADDR_SHORT;
134 da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
136 da.mode = IEEE802154_ADDR_LONG;
137 da.extended_addr = ieee802154_devaddr_from_raw(daddr);
139 /* request acknowledgment */
140 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
143 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
144 type, (void *)&da, (void *)&sa, 0);
147 static int lowpan_give_skb_to_devices(struct sk_buff *skb,
148 struct net_device *dev)
150 struct lowpan_dev_record *entry;
151 struct sk_buff *skb_cp;
152 int stat = NET_RX_SUCCESS;
155 list_for_each_entry_rcu(entry, &lowpan_devices, list)
156 if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
157 skb_cp = skb_copy(skb, GFP_ATOMIC);
163 skb_cp->dev = entry->ldev;
164 stat = netif_rx(skb_cp);
171 static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
174 struct ieee802154_addr_sa sa, da;
177 raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len);
178 /* at least two bytes will be used for the encoding */
182 if (lowpan_fetch_skb_u8(skb, &iphc0))
185 if (lowpan_fetch_skb_u8(skb, &iphc1))
188 ieee802154_addr_to_sa(&sa, &hdr->source);
189 ieee802154_addr_to_sa(&da, &hdr->dest);
191 if (sa.addr_type == IEEE802154_ADDR_SHORT)
192 sap = &sa.short_addr;
196 if (da.addr_type == IEEE802154_ADDR_SHORT)
197 dap = &da.short_addr;
201 return lowpan_process_data(skb, skb->dev, sap, sa.addr_type,
202 IEEE802154_ADDR_LEN, dap, da.addr_type,
203 IEEE802154_ADDR_LEN, iphc0, iphc1,
204 lowpan_give_skb_to_devices);
211 static int lowpan_set_address(struct net_device *dev, void *p)
213 struct sockaddr *sa = p;
215 if (netif_running(dev))
218 /* TODO: validate addr */
219 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
225 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
226 int mlen, int plen, int offset, int type)
228 struct sk_buff *frag;
231 hlen = (type == LOWPAN_DISPATCH_FRAG1) ?
232 LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE;
234 raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
236 frag = netdev_alloc_skb(skb->dev,
237 hlen + mlen + plen + IEEE802154_MFR_SIZE);
241 frag->priority = skb->priority;
243 /* copy header, MFR and payload */
245 skb_copy_to_linear_data(frag, skb_mac_header(skb), mlen);
248 skb_copy_to_linear_data_offset(frag, mlen, head, hlen);
251 skb_copy_to_linear_data_offset(frag, mlen + hlen,
252 skb_network_header(skb) + offset, plen);
254 raw_dump_table(__func__, " raw fragment dump", frag->data, frag->len);
256 return dev_queue_xmit(frag);
260 lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev)
263 u16 dgram_offset, dgram_size, payload_length, header_length,
264 lowpan_size, frag_plen, offset;
268 header_length = skb->mac_len;
269 payload_length = skb->len - header_length;
270 tag = lowpan_dev_info(dev)->fragment_tag++;
271 lowpan_size = skb_network_header_len(skb);
272 dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
275 /* first fragment header */
276 head[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x7);
277 head[1] = dgram_size & 0xff;
278 memcpy(head + 2, &tag, sizeof(tag));
280 /* calc the nearest payload length(divided to 8) for first fragment
281 * which fits into a IEEE802154_MTU
283 frag_plen = round_down(IEEE802154_MTU - header_length -
284 LOWPAN_FRAG1_HEAD_SIZE - lowpan_size -
285 IEEE802154_MFR_SIZE, 8);
287 err = lowpan_fragment_xmit(skb, head, header_length,
288 frag_plen + lowpan_size, 0,
289 LOWPAN_DISPATCH_FRAG1);
291 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
296 offset = lowpan_size + frag_plen;
297 dgram_offset += frag_plen;
299 /* next fragment header */
300 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
301 head[0] |= LOWPAN_DISPATCH_FRAGN;
303 frag_plen = round_down(IEEE802154_MTU - header_length -
304 LOWPAN_FRAGN_HEAD_SIZE - IEEE802154_MFR_SIZE, 8);
306 while (payload_length - offset > 0) {
309 head[4] = dgram_offset >> 3;
311 if (payload_length - offset < len)
312 len = payload_length - offset;
314 err = lowpan_fragment_xmit(skb, head, header_length, len,
315 offset, LOWPAN_DISPATCH_FRAGN);
317 pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
318 __func__, tag, offset);
330 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
334 pr_debug("package xmit\n");
336 skb->dev = lowpan_dev_info(dev)->real_dev;
337 if (skb->dev == NULL) {
338 pr_debug("ERROR: no real wpan device found\n");
342 /* Send directly if less than the MTU minus the 2 checksum bytes. */
343 if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
344 err = dev_queue_xmit(skb);
348 pr_debug("frame is too big, fragmentation is needed\n");
349 err = lowpan_skb_fragmentation(skb, dev);
354 pr_debug("ERROR: xmit failed\n");
356 return (err < 0) ? NET_XMIT_DROP : err;
359 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
361 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
362 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
365 static __le16 lowpan_get_pan_id(const struct net_device *dev)
367 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
368 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
371 static __le16 lowpan_get_short_addr(const struct net_device *dev)
373 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
374 return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
377 static u8 lowpan_get_dsn(const struct net_device *dev)
379 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
380 return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
383 static struct header_ops lowpan_header_ops = {
384 .create = lowpan_header_create,
387 static struct lock_class_key lowpan_tx_busylock;
388 static struct lock_class_key lowpan_netdev_xmit_lock_key;
390 static void lowpan_set_lockdep_class_one(struct net_device *dev,
391 struct netdev_queue *txq,
394 lockdep_set_class(&txq->_xmit_lock,
395 &lowpan_netdev_xmit_lock_key);
399 static int lowpan_dev_init(struct net_device *dev)
401 netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
402 dev->qdisc_tx_busylock = &lowpan_tx_busylock;
406 static const struct net_device_ops lowpan_netdev_ops = {
407 .ndo_init = lowpan_dev_init,
408 .ndo_start_xmit = lowpan_xmit,
409 .ndo_set_mac_address = lowpan_set_address,
412 static struct ieee802154_mlme_ops lowpan_mlme = {
413 .get_pan_id = lowpan_get_pan_id,
414 .get_phy = lowpan_get_phy,
415 .get_short_addr = lowpan_get_short_addr,
416 .get_dsn = lowpan_get_dsn,
419 static void lowpan_setup(struct net_device *dev)
421 dev->addr_len = IEEE802154_ADDR_LEN;
422 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
423 dev->type = ARPHRD_IEEE802154;
424 /* Frame Control + Sequence Number + Address fields + Security Header */
425 dev->hard_header_len = 2 + 1 + 20 + 14;
426 dev->needed_tailroom = 2; /* FCS */
428 dev->tx_queue_len = 0;
429 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
430 dev->watchdog_timeo = 0;
432 dev->netdev_ops = &lowpan_netdev_ops;
433 dev->header_ops = &lowpan_header_ops;
434 dev->ml_priv = &lowpan_mlme;
435 dev->destructor = free_netdev;
438 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
440 if (tb[IFLA_ADDRESS]) {
441 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
447 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
448 struct packet_type *pt, struct net_device *orig_dev)
450 struct sk_buff *local_skb;
451 struct ieee802154_hdr hdr;
454 if (!netif_running(dev))
457 if (dev->type != ARPHRD_IEEE802154)
460 if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
463 local_skb = skb_clone(skb, GFP_ATOMIC);
469 /* check that it's our buffer */
470 if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
471 local_skb->protocol = htons(ETH_P_IPV6);
472 local_skb->pkt_type = PACKET_HOST;
474 /* Pull off the 1-byte of 6lowpan header. */
475 skb_pull(local_skb, 1);
477 ret = lowpan_give_skb_to_devices(local_skb, NULL);
478 if (ret == NET_RX_DROP)
481 switch (skb->data[0] & 0xe0) {
482 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
483 ret = process_data(local_skb, &hdr);
484 if (ret == NET_RX_DROP)
487 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
488 ret = lowpan_frag_rcv(local_skb, LOWPAN_DISPATCH_FRAG1);
490 ret = process_data(local_skb, &hdr);
491 if (ret == NET_RX_DROP)
495 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
496 ret = lowpan_frag_rcv(local_skb, LOWPAN_DISPATCH_FRAGN);
498 ret = process_data(local_skb, &hdr);
499 if (ret == NET_RX_DROP)
508 return NET_RX_SUCCESS;
515 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
516 struct nlattr *tb[], struct nlattr *data[])
518 struct net_device *real_dev;
519 struct lowpan_dev_record *entry;
521 pr_debug("adding new link\n");
525 /* find and hold real wpan device */
526 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
529 if (real_dev->type != ARPHRD_IEEE802154) {
534 lowpan_dev_info(dev)->real_dev = real_dev;
535 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
537 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
540 lowpan_dev_info(dev)->real_dev = NULL;
546 /* Set the lowpan harware address to the wpan hardware address. */
547 memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
549 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
550 INIT_LIST_HEAD(&entry->list);
551 list_add_tail(&entry->list, &lowpan_devices);
552 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
554 register_netdevice(dev);
559 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
561 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
562 struct net_device *real_dev = lowpan_dev->real_dev;
563 struct lowpan_dev_record *entry, *tmp;
567 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
568 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
569 if (entry->ldev == dev) {
570 list_del(&entry->list);
574 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
576 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
578 unregister_netdevice_queue(dev, head);
583 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
585 .priv_size = sizeof(struct lowpan_dev_info),
586 .setup = lowpan_setup,
587 .newlink = lowpan_newlink,
588 .dellink = lowpan_dellink,
589 .validate = lowpan_validate,
592 static inline int __init lowpan_netlink_init(void)
594 return rtnl_link_register(&lowpan_link_ops);
597 static inline void lowpan_netlink_fini(void)
599 rtnl_link_unregister(&lowpan_link_ops);
602 static int lowpan_device_event(struct notifier_block *unused,
603 unsigned long event, void *ptr)
605 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
607 struct lowpan_dev_record *entry, *tmp;
609 if (dev->type != ARPHRD_IEEE802154)
612 if (event == NETDEV_UNREGISTER) {
613 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
614 if (lowpan_dev_info(entry->ldev)->real_dev == dev)
615 lowpan_dellink(entry->ldev, &del_list);
618 unregister_netdevice_many(&del_list);
625 static struct notifier_block lowpan_dev_notifier = {
626 .notifier_call = lowpan_device_event,
629 static struct packet_type lowpan_packet_type = {
630 .type = htons(ETH_P_IEEE802154),
634 static int __init lowpan_init_module(void)
638 err = lowpan_net_frag_init();
642 err = lowpan_netlink_init();
646 dev_add_pack(&lowpan_packet_type);
648 err = register_netdevice_notifier(&lowpan_dev_notifier);
655 dev_remove_pack(&lowpan_packet_type);
656 lowpan_netlink_fini();
658 lowpan_net_frag_exit();
663 static void __exit lowpan_cleanup_module(void)
665 lowpan_netlink_fini();
667 dev_remove_pack(&lowpan_packet_type);
669 lowpan_net_frag_exit();
671 unregister_netdevice_notifier(&lowpan_dev_notifier);
674 module_init(lowpan_init_module);
675 module_exit(lowpan_cleanup_module);
676 MODULE_LICENSE("GPL");
677 MODULE_ALIAS_RTNL_LINK("lowpan");