Alexander Aring | d57fec8 | 2014-02-28 07:32:48 +0100 | [diff] [blame] | 1 | /* Copyright 2011, Siemens AG |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 2 | * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> |
| 3 | */ |
| 4 | |
Alexander Aring | d57fec8 | 2014-02-28 07:32:48 +0100 | [diff] [blame] | 5 | /* Based on patches from Jon Smirl <jonsmirl@gmail.com> |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 6 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> |
| 7 | * |
| 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. |
| 11 | * |
| 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. |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 16 | */ |
| 17 | |
| 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. |
| 21 | * |
| 22 | * Redistribution and use in source and binary forms, with or without |
| 23 | * modification, are permitted provided that the following conditions |
| 24 | * are met: |
| 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. |
| 33 | * |
| 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 |
| 44 | * SUCH DAMAGE. |
| 45 | */ |
| 46 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 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> |
Alexander Aring | cefc8c8 | 2014-03-05 14:29:05 +0100 | [diff] [blame] | 55 | #include <net/6lowpan.h> |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 56 | #include <net/ipv6.h> |
| 57 | |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 58 | #include "reassembly.h" |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 59 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 60 | static LIST_HEAD(lowpan_devices); |
| 61 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 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 */ |
Alexander Aring | 02600d0 | 2014-02-28 07:32:46 +0100 | [diff] [blame] | 66 | __be16 fragment_tag; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | struct lowpan_dev_record { |
| 70 | struct net_device *ldev; |
| 71 | struct list_head list; |
| 72 | }; |
| 73 | |
| 74 | static inline struct |
| 75 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) |
| 76 | { |
| 77 | return netdev_priv(dev); |
| 78 | } |
| 79 | |
| 80 | static inline void lowpan_address_flip(u8 *src, u8 *dest) |
| 81 | { |
| 82 | int i; |
| 83 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) |
| 84 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; |
| 85 | } |
| 86 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 87 | static int lowpan_header_create(struct sk_buff *skb, |
| 88 | struct net_device *dev, |
| 89 | unsigned short type, const void *_daddr, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 90 | const void *_saddr, unsigned int len) |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 91 | { |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 92 | const u8 *saddr = _saddr; |
| 93 | const u8 *daddr = _daddr; |
Phoebe Buckheister | e6278d9 | 2014-03-14 21:24:01 +0100 | [diff] [blame] | 94 | struct ieee802154_addr sa, da; |
Phoebe Buckheister | 32edc40 | 2014-05-14 17:43:08 +0200 | [diff] [blame^] | 95 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 96 | |
Alexander Aring | fc4e98d | 2013-02-05 10:23:43 +0000 | [diff] [blame] | 97 | /* TODO: |
| 98 | * if this package isn't ipv6 one, where should it be routed? |
| 99 | */ |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 100 | if (type != ETH_P_IPV6) |
| 101 | return 0; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 102 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 103 | if (!saddr) |
| 104 | saddr = dev->dev_addr; |
| 105 | |
Alexander Aring | 841a5ec | 2013-12-12 20:15:25 +0100 | [diff] [blame] | 106 | raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); |
| 107 | raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 108 | |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 109 | lowpan_header_compress(skb, dev, type, daddr, saddr, len); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 110 | |
Alexander Aring | d57fec8 | 2014-02-28 07:32:48 +0100 | [diff] [blame] | 111 | /* NOTE1: I'm still unsure about the fact that compression and WPAN |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 112 | * header are created here and not later in the xmit. So wait for |
| 113 | * an opinion of net maintainers. |
| 114 | */ |
Alexander Aring | d57fec8 | 2014-02-28 07:32:48 +0100 | [diff] [blame] | 115 | /* NOTE2: to be absolutely correct, we must derive PANid information |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 116 | * from MAC subif of the 'dev' and 'real_dev' network devices, but |
| 117 | * this isn't implemented in mainline yet, so currently we assign 0xff |
| 118 | */ |
Phoebe Buckheister | 32edc40 | 2014-05-14 17:43:08 +0200 | [diff] [blame^] | 119 | cb->type = IEEE802154_FC_TYPE_DATA; |
Tony Cheneau | 58ef67c | 2013-03-25 17:59:25 +0000 | [diff] [blame] | 120 | |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 121 | /* prepare wpan address data */ |
Phoebe Buckheister | e6278d9 | 2014-03-14 21:24:01 +0100 | [diff] [blame] | 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); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 125 | |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 126 | /* intra-PAN communications */ |
Phoebe Buckheister | b70ab2e | 2014-03-14 21:23:59 +0100 | [diff] [blame] | 127 | da.pan_id = sa.pan_id; |
Tony Cheneau | 43de7aa | 2013-03-25 17:59:31 +0000 | [diff] [blame] | 128 | |
Alexander Aring | d57fec8 | 2014-02-28 07:32:48 +0100 | [diff] [blame] | 129 | /* if the destination address is the broadcast address, use the |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 130 | * corresponding short address |
| 131 | */ |
| 132 | if (lowpan_is_addr_broadcast(daddr)) { |
Phoebe Buckheister | e6278d9 | 2014-03-14 21:24:01 +0100 | [diff] [blame] | 133 | da.mode = IEEE802154_ADDR_SHORT; |
| 134 | da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 135 | } else { |
Phoebe Buckheister | e6278d9 | 2014-03-14 21:24:01 +0100 | [diff] [blame] | 136 | da.mode = IEEE802154_ADDR_LONG; |
| 137 | da.extended_addr = ieee802154_devaddr_from_raw(daddr); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 138 | } |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 139 | |
Phoebe Buckheister | 32edc40 | 2014-05-14 17:43:08 +0200 | [diff] [blame^] | 140 | cb->ackreq = !lowpan_is_addr_broadcast(daddr); |
| 141 | |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 142 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
Phoebe Buckheister | d1d7358 | 2014-03-14 21:24:04 +0100 | [diff] [blame] | 143 | type, (void *)&da, (void *)&sa, 0); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 144 | } |
| 145 | |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 146 | static int lowpan_give_skb_to_devices(struct sk_buff *skb, |
| 147 | struct net_device *dev) |
Alan Ott | 0c44621 | 2013-01-16 19:09:47 +0000 | [diff] [blame] | 148 | { |
| 149 | struct lowpan_dev_record *entry; |
| 150 | struct sk_buff *skb_cp; |
| 151 | int stat = NET_RX_SUCCESS; |
| 152 | |
| 153 | rcu_read_lock(); |
| 154 | list_for_each_entry_rcu(entry, &lowpan_devices, list) |
| 155 | if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) { |
| 156 | skb_cp = skb_copy(skb, GFP_ATOMIC); |
| 157 | if (!skb_cp) { |
| 158 | stat = -ENOMEM; |
| 159 | break; |
| 160 | } |
| 161 | |
| 162 | skb_cp->dev = entry->ldev; |
| 163 | stat = netif_rx(skb_cp); |
| 164 | } |
| 165 | rcu_read_unlock(); |
| 166 | |
| 167 | return stat; |
| 168 | } |
| 169 | |
Phoebe Buckheister | ae531b9 | 2014-03-14 21:24:02 +0100 | [diff] [blame] | 170 | static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr) |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 171 | { |
Jukka Rissanen | 8df8c56 | 2013-12-11 17:05:34 +0200 | [diff] [blame] | 172 | u8 iphc0, iphc1; |
Phoebe Buckheister | ae531b9 | 2014-03-14 21:24:02 +0100 | [diff] [blame] | 173 | struct ieee802154_addr_sa sa, da; |
| 174 | void *sap, *dap; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 175 | |
Alexander Aring | 841a5ec | 2013-12-12 20:15:25 +0100 | [diff] [blame] | 176 | raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 177 | /* at least two bytes will be used for the encoding */ |
| 178 | if (skb->len < 2) |
| 179 | goto drop; |
alex.bluesman.smirnov@gmail.com | c5d3687 | 2012-06-25 03:49:01 +0000 | [diff] [blame] | 180 | |
| 181 | if (lowpan_fetch_skb_u8(skb, &iphc0)) |
| 182 | goto drop; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 183 | |
alex.bluesman.smirnov@gmail.com | c5d3687 | 2012-06-25 03:49:01 +0000 | [diff] [blame] | 184 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
| 185 | goto drop; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 186 | |
Phoebe Buckheister | ae531b9 | 2014-03-14 21:24:02 +0100 | [diff] [blame] | 187 | ieee802154_addr_to_sa(&sa, &hdr->source); |
| 188 | ieee802154_addr_to_sa(&da, &hdr->dest); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 189 | |
Phoebe Buckheister | ae531b9 | 2014-03-14 21:24:02 +0100 | [diff] [blame] | 190 | if (sa.addr_type == IEEE802154_ADDR_SHORT) |
| 191 | sap = &sa.short_addr; |
| 192 | else |
| 193 | sap = &sa.hwaddr; |
| 194 | |
| 195 | if (da.addr_type == IEEE802154_ADDR_SHORT) |
| 196 | dap = &da.short_addr; |
| 197 | else |
| 198 | dap = &da.hwaddr; |
| 199 | |
| 200 | return lowpan_process_data(skb, skb->dev, sap, sa.addr_type, |
| 201 | IEEE802154_ADDR_LEN, dap, da.addr_type, |
| 202 | IEEE802154_ADDR_LEN, iphc0, iphc1, |
| 203 | lowpan_give_skb_to_devices); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 204 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 205 | drop: |
Dan Carpenter | 90d0963 | 2011-08-30 03:45:52 +0000 | [diff] [blame] | 206 | kfree_skb(skb); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 207 | return -EINVAL; |
| 208 | } |
| 209 | |
alex.bluesman.smirnov@gmail.com | 42c3629 | 2012-07-01 19:58:46 +0000 | [diff] [blame] | 210 | static int lowpan_set_address(struct net_device *dev, void *p) |
| 211 | { |
| 212 | struct sockaddr *sa = p; |
| 213 | |
| 214 | if (netif_running(dev)) |
| 215 | return -EBUSY; |
| 216 | |
| 217 | /* TODO: validate addr */ |
| 218 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 223 | static int |
| 224 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, |
Alexander Aring | d57fec8 | 2014-02-28 07:32:48 +0100 | [diff] [blame] | 225 | int mlen, int plen, int offset, int type) |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 226 | { |
| 227 | struct sk_buff *frag; |
Alexander Aring | 545f361 | 2013-10-28 10:24:16 +0100 | [diff] [blame] | 228 | int hlen; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 229 | |
Tony Cheneau | d991b98 | 2013-03-25 17:59:26 +0000 | [diff] [blame] | 230 | hlen = (type == LOWPAN_DISPATCH_FRAG1) ? |
| 231 | LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 232 | |
Alexander Aring | 841a5ec | 2013-12-12 20:15:25 +0100 | [diff] [blame] | 233 | raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 234 | |
Alexander Aring | b614442 | 2013-10-28 10:24:18 +0100 | [diff] [blame] | 235 | frag = netdev_alloc_skb(skb->dev, |
| 236 | hlen + mlen + plen + IEEE802154_MFR_SIZE); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 237 | if (!frag) |
| 238 | return -ENOMEM; |
| 239 | |
| 240 | frag->priority = skb->priority; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 241 | |
| 242 | /* copy header, MFR and payload */ |
Alexander Aring | 3582b90 | 2013-10-30 09:18:24 +0100 | [diff] [blame] | 243 | skb_put(frag, mlen); |
| 244 | skb_copy_to_linear_data(frag, skb_mac_header(skb), mlen); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 245 | |
Alexander Aring | 3582b90 | 2013-10-30 09:18:24 +0100 | [diff] [blame] | 246 | skb_put(frag, hlen); |
| 247 | skb_copy_to_linear_data_offset(frag, mlen, head, hlen); |
| 248 | |
| 249 | skb_put(frag, plen); |
| 250 | skb_copy_to_linear_data_offset(frag, mlen + hlen, |
| 251 | skb_network_header(skb) + offset, plen); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 252 | |
Alexander Aring | 841a5ec | 2013-12-12 20:15:25 +0100 | [diff] [blame] | 253 | raw_dump_table(__func__, " raw fragment dump", frag->data, frag->len); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 254 | |
Alexander Aring | 545f361 | 2013-10-28 10:24:16 +0100 | [diff] [blame] | 255 | return dev_queue_xmit(frag); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | static int |
Tony Cheneau | d4ac323 | 2013-03-25 17:59:28 +0000 | [diff] [blame] | 259 | lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev) |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 260 | { |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 261 | int err; |
| 262 | u16 dgram_offset, dgram_size, payload_length, header_length, |
Alexander Aring | 02600d0 | 2014-02-28 07:32:46 +0100 | [diff] [blame] | 263 | lowpan_size, frag_plen, offset; |
| 264 | __be16 tag; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 265 | u8 head[5]; |
| 266 | |
Alexander Aring | 3e69162 | 2013-10-30 09:18:22 +0100 | [diff] [blame] | 267 | header_length = skb->mac_len; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 268 | payload_length = skb->len - header_length; |
Tony Cheneau | d4ac323 | 2013-03-25 17:59:28 +0000 | [diff] [blame] | 269 | tag = lowpan_dev_info(dev)->fragment_tag++; |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 270 | lowpan_size = skb_network_header_len(skb); |
| 271 | dgram_size = lowpan_uncompress_size(skb, &dgram_offset) - |
| 272 | header_length; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 273 | |
| 274 | /* first fragment header */ |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 275 | head[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x7); |
| 276 | head[1] = dgram_size & 0xff; |
Alexander Aring | b6f82fc | 2014-03-02 08:09:35 +0100 | [diff] [blame] | 277 | memcpy(head + 2, &tag, sizeof(tag)); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 278 | |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 279 | /* calc the nearest payload length(divided to 8) for first fragment |
| 280 | * which fits into a IEEE802154_MTU |
| 281 | */ |
| 282 | frag_plen = round_down(IEEE802154_MTU - header_length - |
| 283 | LOWPAN_FRAG1_HEAD_SIZE - lowpan_size - |
| 284 | IEEE802154_MFR_SIZE, 8); |
Tony Cheneau | d991b98 | 2013-03-25 17:59:26 +0000 | [diff] [blame] | 285 | |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 286 | err = lowpan_fragment_xmit(skb, head, header_length, |
| 287 | frag_plen + lowpan_size, 0, |
| 288 | LOWPAN_DISPATCH_FRAG1); |
Tony Cheneau | 9da2924 | 2013-03-25 17:59:27 +0000 | [diff] [blame] | 289 | if (err) { |
| 290 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", |
| 291 | __func__, tag); |
Tony Cheneau | d991b98 | 2013-03-25 17:59:26 +0000 | [diff] [blame] | 292 | goto exit; |
Tony Cheneau | 9da2924 | 2013-03-25 17:59:27 +0000 | [diff] [blame] | 293 | } |
Tony Cheneau | d991b98 | 2013-03-25 17:59:26 +0000 | [diff] [blame] | 294 | |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 295 | offset = lowpan_size + frag_plen; |
| 296 | dgram_offset += frag_plen; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 297 | |
| 298 | /* next fragment header */ |
| 299 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; |
| 300 | head[0] |= LOWPAN_DISPATCH_FRAGN; |
| 301 | |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 302 | frag_plen = round_down(IEEE802154_MTU - header_length - |
| 303 | LOWPAN_FRAGN_HEAD_SIZE - IEEE802154_MFR_SIZE, 8); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 304 | |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 305 | while (payload_length - offset > 0) { |
| 306 | int len = frag_plen; |
| 307 | |
| 308 | head[4] = dgram_offset >> 3; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 309 | |
| 310 | if (payload_length - offset < len) |
| 311 | len = payload_length - offset; |
| 312 | |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 313 | err = lowpan_fragment_xmit(skb, head, header_length, len, |
| 314 | offset, LOWPAN_DISPATCH_FRAGN); |
Tony Cheneau | 9da2924 | 2013-03-25 17:59:27 +0000 | [diff] [blame] | 315 | if (err) { |
Alexander Aring | d57fec8 | 2014-02-28 07:32:48 +0100 | [diff] [blame] | 316 | pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n", |
| 317 | __func__, tag, offset); |
Tony Cheneau | d991b98 | 2013-03-25 17:59:26 +0000 | [diff] [blame] | 318 | goto exit; |
Tony Cheneau | 9da2924 | 2013-03-25 17:59:27 +0000 | [diff] [blame] | 319 | } |
Tony Cheneau | d991b98 | 2013-03-25 17:59:26 +0000 | [diff] [blame] | 320 | |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 321 | offset += len; |
Alexander Aring | 96cb3eb | 2014-02-28 07:32:45 +0100 | [diff] [blame] | 322 | dgram_offset += len; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 323 | } |
| 324 | |
Tony Cheneau | d991b98 | 2013-03-25 17:59:26 +0000 | [diff] [blame] | 325 | exit: |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 326 | return err; |
| 327 | } |
| 328 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 329 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
| 330 | { |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 331 | int err = -1; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 332 | |
alex.bluesman.smirnov@gmail.com | e71094f | 2012-06-25 03:49:03 +0000 | [diff] [blame] | 333 | pr_debug("package xmit\n"); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 334 | |
| 335 | skb->dev = lowpan_dev_info(dev)->real_dev; |
| 336 | if (skb->dev == NULL) { |
alex.bluesman.smirnov@gmail.com | e71094f | 2012-06-25 03:49:03 +0000 | [diff] [blame] | 337 | pr_debug("ERROR: no real wpan device found\n"); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 338 | goto error; |
| 339 | } |
| 340 | |
Alan Ott | b333b7e | 2012-11-29 15:55:44 +0000 | [diff] [blame] | 341 | /* Send directly if less than the MTU minus the 2 checksum bytes. */ |
| 342 | if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) { |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 343 | err = dev_queue_xmit(skb); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 344 | goto out; |
| 345 | } |
| 346 | |
alex.bluesman.smirnov@gmail.com | e71094f | 2012-06-25 03:49:03 +0000 | [diff] [blame] | 347 | pr_debug("frame is too big, fragmentation is needed\n"); |
Tony Cheneau | d4ac323 | 2013-03-25 17:59:28 +0000 | [diff] [blame] | 348 | err = lowpan_skb_fragmentation(skb, dev); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 349 | error: |
| 350 | dev_kfree_skb(skb); |
| 351 | out: |
Alan Ott | fc52eea | 2013-04-03 04:00:58 +0000 | [diff] [blame] | 352 | if (err) |
alex.bluesman.smirnov@gmail.com | e71094f | 2012-06-25 03:49:03 +0000 | [diff] [blame] | 353 | pr_debug("ERROR: xmit failed\n"); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 354 | |
Alan Ott | fc52eea | 2013-04-03 04:00:58 +0000 | [diff] [blame] | 355 | return (err < 0) ? NET_XMIT_DROP : err; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 356 | } |
| 357 | |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 358 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
| 359 | { |
| 360 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| 361 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); |
| 362 | } |
| 363 | |
Phoebe Buckheister | b70ab2e | 2014-03-14 21:23:59 +0100 | [diff] [blame] | 364 | static __le16 lowpan_get_pan_id(const struct net_device *dev) |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 365 | { |
| 366 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| 367 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); |
| 368 | } |
| 369 | |
Phoebe Buckheister | b70ab2e | 2014-03-14 21:23:59 +0100 | [diff] [blame] | 370 | static __le16 lowpan_get_short_addr(const struct net_device *dev) |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 371 | { |
| 372 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| 373 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); |
| 374 | } |
| 375 | |
Tony Cheneau | c7d0ab2 | 2013-03-25 17:59:30 +0000 | [diff] [blame] | 376 | static u8 lowpan_get_dsn(const struct net_device *dev) |
| 377 | { |
| 378 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| 379 | return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev); |
| 380 | } |
| 381 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 382 | static struct header_ops lowpan_header_ops = { |
| 383 | .create = lowpan_header_create, |
| 384 | }; |
| 385 | |
Eric Dumazet | 20e7c4e8 | 2014-02-10 11:42:35 -0800 | [diff] [blame] | 386 | static struct lock_class_key lowpan_tx_busylock; |
| 387 | static struct lock_class_key lowpan_netdev_xmit_lock_key; |
| 388 | |
| 389 | static void lowpan_set_lockdep_class_one(struct net_device *dev, |
| 390 | struct netdev_queue *txq, |
| 391 | void *_unused) |
| 392 | { |
| 393 | lockdep_set_class(&txq->_xmit_lock, |
| 394 | &lowpan_netdev_xmit_lock_key); |
| 395 | } |
| 396 | |
| 397 | |
| 398 | static int lowpan_dev_init(struct net_device *dev) |
| 399 | { |
| 400 | netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL); |
| 401 | dev->qdisc_tx_busylock = &lowpan_tx_busylock; |
| 402 | return 0; |
| 403 | } |
| 404 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 405 | static const struct net_device_ops lowpan_netdev_ops = { |
Eric Dumazet | 20e7c4e8 | 2014-02-10 11:42:35 -0800 | [diff] [blame] | 406 | .ndo_init = lowpan_dev_init, |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 407 | .ndo_start_xmit = lowpan_xmit, |
alex.bluesman.smirnov@gmail.com | 42c3629 | 2012-07-01 19:58:46 +0000 | [diff] [blame] | 408 | .ndo_set_mac_address = lowpan_set_address, |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 409 | }; |
| 410 | |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 411 | static struct ieee802154_mlme_ops lowpan_mlme = { |
| 412 | .get_pan_id = lowpan_get_pan_id, |
| 413 | .get_phy = lowpan_get_phy, |
| 414 | .get_short_addr = lowpan_get_short_addr, |
Tony Cheneau | c7d0ab2 | 2013-03-25 17:59:30 +0000 | [diff] [blame] | 415 | .get_dsn = lowpan_get_dsn, |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 416 | }; |
| 417 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 418 | static void lowpan_setup(struct net_device *dev) |
| 419 | { |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 420 | dev->addr_len = IEEE802154_ADDR_LEN; |
| 421 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); |
| 422 | dev->type = ARPHRD_IEEE802154; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 423 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
| 424 | dev->hard_header_len = 2 + 1 + 20 + 14; |
| 425 | dev->needed_tailroom = 2; /* FCS */ |
| 426 | dev->mtu = 1281; |
| 427 | dev->tx_queue_len = 0; |
alex.bluesman.smirnov@gmail.com | 4d039f6 | 2011-11-10 07:39:37 +0000 | [diff] [blame] | 428 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 429 | dev->watchdog_timeo = 0; |
| 430 | |
| 431 | dev->netdev_ops = &lowpan_netdev_ops; |
| 432 | dev->header_ops = &lowpan_header_ops; |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 433 | dev->ml_priv = &lowpan_mlme; |
Alan Ott | a2dc375e | 2012-09-01 05:57:07 +0000 | [diff] [blame] | 434 | dev->destructor = free_netdev; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 438 | { |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 439 | if (tb[IFLA_ADDRESS]) { |
| 440 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) |
| 441 | return -EINVAL; |
| 442 | } |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, |
| 447 | struct packet_type *pt, struct net_device *orig_dev) |
| 448 | { |
Phoebe Buckheister | ae531b9 | 2014-03-14 21:24:02 +0100 | [diff] [blame] | 449 | struct ieee802154_hdr hdr; |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 450 | int ret; |
Alan Ott | a437d27 | 2012-09-01 05:57:06 +0000 | [diff] [blame] | 451 | |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 452 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 453 | if (!skb) |
| 454 | goto drop; |
| 455 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 456 | if (!netif_running(dev)) |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 457 | goto drop_skb; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 458 | |
| 459 | if (dev->type != ARPHRD_IEEE802154) |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 460 | goto drop_skb; |
| 461 | |
Phoebe Buckheister | ae531b9 | 2014-03-14 21:24:02 +0100 | [diff] [blame] | 462 | if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) |
| 463 | goto drop_skb; |
| 464 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 465 | /* check that it's our buffer */ |
Alan Ott | ee21c7e | 2013-01-16 19:09:48 +0000 | [diff] [blame] | 466 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 467 | skb->protocol = htons(ETH_P_IPV6); |
| 468 | skb->pkt_type = PACKET_HOST; |
Alan Ott | ee21c7e | 2013-01-16 19:09:48 +0000 | [diff] [blame] | 469 | |
| 470 | /* Pull off the 1-byte of 6lowpan header. */ |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 471 | skb_pull(skb, 1); |
Alan Ott | ee21c7e | 2013-01-16 19:09:48 +0000 | [diff] [blame] | 472 | |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 473 | ret = lowpan_give_skb_to_devices(skb, NULL); |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 474 | if (ret == NET_RX_DROP) |
| 475 | goto drop; |
Alan Ott | ee21c7e | 2013-01-16 19:09:48 +0000 | [diff] [blame] | 476 | } else { |
| 477 | switch (skb->data[0] & 0xe0) { |
| 478 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 479 | ret = process_data(skb, &hdr); |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 480 | if (ret == NET_RX_DROP) |
Alan Ott | ee21c7e | 2013-01-16 19:09:48 +0000 | [diff] [blame] | 481 | goto drop; |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 482 | break; |
| 483 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 484 | ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1); |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 485 | if (ret == 1) { |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 486 | ret = process_data(skb, &hdr); |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 487 | if (ret == NET_RX_DROP) |
| 488 | goto drop; |
| 489 | } |
| 490 | break; |
| 491 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 492 | ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN); |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 493 | if (ret == 1) { |
Phoebe Buckheister | 8cfad49 | 2014-03-17 18:30:19 +0100 | [diff] [blame] | 494 | ret = process_data(skb, &hdr); |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 495 | if (ret == NET_RX_DROP) |
| 496 | goto drop; |
| 497 | } |
Alan Ott | ee21c7e | 2013-01-16 19:09:48 +0000 | [diff] [blame] | 498 | break; |
| 499 | default: |
| 500 | break; |
| 501 | } |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 502 | } |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 503 | |
| 504 | return NET_RX_SUCCESS; |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 505 | drop_skb: |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 506 | kfree_skb(skb); |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 507 | drop: |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 508 | return NET_RX_DROP; |
| 509 | } |
| 510 | |
| 511 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, |
| 512 | struct nlattr *tb[], struct nlattr *data[]) |
| 513 | { |
| 514 | struct net_device *real_dev; |
| 515 | struct lowpan_dev_record *entry; |
| 516 | |
alex.bluesman.smirnov@gmail.com | e71094f | 2012-06-25 03:49:03 +0000 | [diff] [blame] | 517 | pr_debug("adding new link\n"); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 518 | |
| 519 | if (!tb[IFLA_LINK]) |
| 520 | return -EINVAL; |
| 521 | /* find and hold real wpan device */ |
| 522 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
| 523 | if (!real_dev) |
| 524 | return -ENODEV; |
Dan Carpenter | 78032f9 | 2013-11-07 10:44:45 +0300 | [diff] [blame] | 525 | if (real_dev->type != ARPHRD_IEEE802154) { |
| 526 | dev_put(real_dev); |
Alan Ott | 7adac1e | 2013-10-05 23:15:18 -0400 | [diff] [blame] | 527 | return -EINVAL; |
Dan Carpenter | 78032f9 | 2013-11-07 10:44:45 +0300 | [diff] [blame] | 528 | } |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 529 | |
| 530 | lowpan_dev_info(dev)->real_dev = real_dev; |
| 531 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); |
| 532 | |
Alexander Aring | d57fec8 | 2014-02-28 07:32:48 +0100 | [diff] [blame] | 533 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
Dan Carpenter | dc00fd4 | 2011-08-30 03:51:09 +0000 | [diff] [blame] | 534 | if (!entry) { |
| 535 | dev_put(real_dev); |
| 536 | lowpan_dev_info(dev)->real_dev = NULL; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 537 | return -ENOMEM; |
Dan Carpenter | dc00fd4 | 2011-08-30 03:51:09 +0000 | [diff] [blame] | 538 | } |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 539 | |
| 540 | entry->ldev = dev; |
| 541 | |
Alan Ott | ab2d95d | 2013-10-05 23:15:19 -0400 | [diff] [blame] | 542 | /* Set the lowpan harware address to the wpan hardware address. */ |
| 543 | memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN); |
| 544 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 545 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
| 546 | INIT_LIST_HEAD(&entry->list); |
| 547 | list_add_tail(&entry->list, &lowpan_devices); |
| 548 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
| 549 | |
| 550 | register_netdevice(dev); |
| 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) |
| 556 | { |
| 557 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); |
| 558 | struct net_device *real_dev = lowpan_dev->real_dev; |
alex.bluesman.smirnov@gmail.com | 8deff4a | 2012-04-25 23:24:57 +0000 | [diff] [blame] | 559 | struct lowpan_dev_record *entry, *tmp; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 560 | |
| 561 | ASSERT_RTNL(); |
| 562 | |
| 563 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
Dan Carpenter | aec9db3 | 2011-08-30 03:46:40 +0000 | [diff] [blame] | 564 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 565 | if (entry->ldev == dev) { |
| 566 | list_del(&entry->list); |
| 567 | kfree(entry); |
| 568 | } |
Dan Carpenter | aec9db3 | 2011-08-30 03:46:40 +0000 | [diff] [blame] | 569 | } |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 570 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
| 571 | |
| 572 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); |
| 573 | |
| 574 | unregister_netdevice_queue(dev, head); |
| 575 | |
| 576 | dev_put(real_dev); |
| 577 | } |
| 578 | |
| 579 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { |
| 580 | .kind = "lowpan", |
| 581 | .priv_size = sizeof(struct lowpan_dev_info), |
| 582 | .setup = lowpan_setup, |
| 583 | .newlink = lowpan_newlink, |
| 584 | .dellink = lowpan_dellink, |
| 585 | .validate = lowpan_validate, |
| 586 | }; |
| 587 | |
| 588 | static inline int __init lowpan_netlink_init(void) |
| 589 | { |
| 590 | return rtnl_link_register(&lowpan_link_ops); |
| 591 | } |
| 592 | |
David S. Miller | a07fdce | 2013-02-06 15:54:38 -0500 | [diff] [blame] | 593 | static inline void lowpan_netlink_fini(void) |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 594 | { |
| 595 | rtnl_link_unregister(&lowpan_link_ops); |
| 596 | } |
| 597 | |
Alan Ott | a2dc375e | 2012-09-01 05:57:07 +0000 | [diff] [blame] | 598 | static int lowpan_device_event(struct notifier_block *unused, |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 599 | unsigned long event, void *ptr) |
Alan Ott | a2dc375e | 2012-09-01 05:57:07 +0000 | [diff] [blame] | 600 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 601 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Alan Ott | a2dc375e | 2012-09-01 05:57:07 +0000 | [diff] [blame] | 602 | LIST_HEAD(del_list); |
| 603 | struct lowpan_dev_record *entry, *tmp; |
| 604 | |
| 605 | if (dev->type != ARPHRD_IEEE802154) |
| 606 | goto out; |
| 607 | |
| 608 | if (event == NETDEV_UNREGISTER) { |
| 609 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
| 610 | if (lowpan_dev_info(entry->ldev)->real_dev == dev) |
| 611 | lowpan_dellink(entry->ldev, &del_list); |
| 612 | } |
| 613 | |
| 614 | unregister_netdevice_many(&del_list); |
Peter Senna Tschudin | 4c83501 | 2012-09-18 07:10:43 +0000 | [diff] [blame] | 615 | } |
Alan Ott | a2dc375e | 2012-09-01 05:57:07 +0000 | [diff] [blame] | 616 | |
| 617 | out: |
| 618 | return NOTIFY_DONE; |
| 619 | } |
| 620 | |
| 621 | static struct notifier_block lowpan_dev_notifier = { |
| 622 | .notifier_call = lowpan_device_event, |
| 623 | }; |
| 624 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 625 | static struct packet_type lowpan_packet_type = { |
Joe Perches | ec633eb | 2014-03-12 10:04:18 -0700 | [diff] [blame] | 626 | .type = htons(ETH_P_IEEE802154), |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 627 | .func = lowpan_rcv, |
| 628 | }; |
| 629 | |
| 630 | static int __init lowpan_init_module(void) |
| 631 | { |
| 632 | int err = 0; |
| 633 | |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 634 | err = lowpan_net_frag_init(); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 635 | if (err < 0) |
| 636 | goto out; |
| 637 | |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 638 | err = lowpan_netlink_init(); |
| 639 | if (err < 0) |
| 640 | goto out_frag; |
| 641 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 642 | dev_add_pack(&lowpan_packet_type); |
Alan Ott | a2dc375e | 2012-09-01 05:57:07 +0000 | [diff] [blame] | 643 | |
| 644 | err = register_netdevice_notifier(&lowpan_dev_notifier); |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 645 | if (err < 0) |
| 646 | goto out_pack; |
| 647 | |
| 648 | return 0; |
| 649 | |
| 650 | out_pack: |
| 651 | dev_remove_pack(&lowpan_packet_type); |
| 652 | lowpan_netlink_fini(); |
| 653 | out_frag: |
| 654 | lowpan_net_frag_exit(); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 655 | out: |
| 656 | return err; |
| 657 | } |
| 658 | |
| 659 | static void __exit lowpan_cleanup_module(void) |
| 660 | { |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 661 | lowpan_netlink_fini(); |
| 662 | |
| 663 | dev_remove_pack(&lowpan_packet_type); |
alex.bluesman.smirnov@gmail.com | 33c34c5 | 2012-07-10 21:22:48 +0000 | [diff] [blame] | 664 | |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 665 | lowpan_net_frag_exit(); |
Alan Ott | a2dc375e | 2012-09-01 05:57:07 +0000 | [diff] [blame] | 666 | |
Alexander Aring | 7240cde | 2014-02-28 07:32:50 +0100 | [diff] [blame] | 667 | unregister_netdevice_notifier(&lowpan_dev_notifier); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 668 | } |
| 669 | |
| 670 | module_init(lowpan_init_module); |
| 671 | module_exit(lowpan_cleanup_module); |
| 672 | MODULE_LICENSE("GPL"); |
| 673 | MODULE_ALIAS_RTNL_LINK("lowpan"); |