2 * Copyright (C) 2007-2012 Siemens AG
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
15 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
16 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
17 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/netdevice.h>
23 #include <linux/crc-ccitt.h>
24 #include <asm/unaligned.h>
26 #include <net/mac802154.h>
27 #include <net/ieee802154_netdev.h>
28 #include <net/nl802154.h>
30 #include "ieee802154_i.h"
32 static int ieee802154_deliver_skb(struct sk_buff *skb)
34 skb->ip_summed = CHECKSUM_UNNECESSARY;
35 skb->protocol = htons(ETH_P_IEEE802154);
37 return netif_receive_skb(skb);
41 ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
42 struct sk_buff *skb, const struct ieee802154_hdr *hdr)
44 struct wpan_dev *wpan_dev = &sdata->wpan_dev;
48 pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
50 spin_lock_bh(&sdata->mib_lock);
52 span = wpan_dev->pan_id;
53 sshort = wpan_dev->short_addr;
55 switch (mac_cb(skb)->dest.mode) {
56 case IEEE802154_ADDR_NONE:
57 if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
58 /* FIXME: check if we are PAN coordinator */
59 skb->pkt_type = PACKET_OTHERHOST;
61 /* ACK comes with both addresses empty */
62 skb->pkt_type = PACKET_HOST;
64 case IEEE802154_ADDR_LONG:
65 if (mac_cb(skb)->dest.pan_id != span &&
66 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
67 skb->pkt_type = PACKET_OTHERHOST;
68 else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
69 skb->pkt_type = PACKET_HOST;
71 skb->pkt_type = PACKET_OTHERHOST;
73 case IEEE802154_ADDR_SHORT:
74 if (mac_cb(skb)->dest.pan_id != span &&
75 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
76 skb->pkt_type = PACKET_OTHERHOST;
77 else if (mac_cb(skb)->dest.short_addr == sshort)
78 skb->pkt_type = PACKET_HOST;
79 else if (mac_cb(skb)->dest.short_addr ==
80 cpu_to_le16(IEEE802154_ADDR_BROADCAST))
81 skb->pkt_type = PACKET_BROADCAST;
83 skb->pkt_type = PACKET_OTHERHOST;
86 spin_unlock_bh(&sdata->mib_lock);
87 pr_debug("invalid dest mode\n");
92 spin_unlock_bh(&sdata->mib_lock);
94 skb->dev = sdata->dev;
96 rc = mac802154_llsec_decrypt(&sdata->sec, skb);
98 pr_debug("decryption failed: %i\n", rc);
102 sdata->dev->stats.rx_packets++;
103 sdata->dev->stats.rx_bytes += skb->len;
105 switch (mac_cb(skb)->type) {
106 case IEEE802154_FC_TYPE_DATA:
107 return ieee802154_deliver_skb(skb);
109 pr_warn("ieee802154: bad frame received (type = %d)\n",
120 ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr)
122 if (addr->mode == IEEE802154_ADDR_NONE)
123 pr_debug("%s not present\n", name);
125 pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
126 if (addr->mode == IEEE802154_ADDR_SHORT) {
127 pr_debug("%s is short: %04x\n", name,
128 le16_to_cpu(addr->short_addr));
130 u64 hw = swab64((__force u64)addr->extended_addr);
132 pr_debug("%s is hardware: %8phC\n", name, &hw);
137 ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr)
140 struct ieee802154_mac_cb *cb = mac_cb_init(skb);
142 skb_reset_mac_header(skb);
144 hlen = ieee802154_hdr_pull(skb, hdr);
150 pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
153 cb->type = hdr->fc.type;
154 cb->ackreq = hdr->fc.ack_request;
155 cb->secen = hdr->fc.security_enabled;
157 ieee802154_print_addr("destination", &hdr->dest);
158 ieee802154_print_addr("source", &hdr->source);
160 cb->source = hdr->source;
161 cb->dest = hdr->dest;
163 if (hdr->fc.security_enabled) {
166 pr_debug("seclevel %i\n", hdr->sec.level);
168 switch (hdr->sec.key_id_mode) {
169 case IEEE802154_SCF_KEY_IMPLICIT:
170 pr_debug("implicit key\n");
173 case IEEE802154_SCF_KEY_INDEX:
174 pr_debug("key %02x\n", hdr->sec.key_id);
177 case IEEE802154_SCF_KEY_SHORT_INDEX:
178 pr_debug("key %04x:%04x %02x\n",
179 le32_to_cpu(hdr->sec.short_src) >> 16,
180 le32_to_cpu(hdr->sec.short_src) & 0xffff,
184 case IEEE802154_SCF_KEY_HW_INDEX:
185 key = swab64((__force u64)hdr->sec.extended_src);
186 pr_debug("key source %8phC %02x\n", &key,
196 __ieee802154_rx_handle_packet(struct ieee802154_local *local,
200 struct ieee802154_sub_if_data *sdata;
201 struct ieee802154_hdr hdr;
203 ret = ieee802154_parse_frame_start(skb, &hdr);
205 pr_debug("got invalid frame\n");
210 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
211 if (sdata->vif.type != NL802154_IFTYPE_NODE ||
212 !netif_running(sdata->dev))
215 ieee802154_subif_frame(sdata, skb, &hdr);
225 ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
227 struct sk_buff *skb2;
228 struct ieee802154_sub_if_data *sdata;
230 skb_reset_mac_header(skb);
231 skb->ip_summed = CHECKSUM_UNNECESSARY;
232 skb->pkt_type = PACKET_OTHERHOST;
233 skb->protocol = htons(ETH_P_IEEE802154);
235 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
236 if (sdata->vif.type != NL802154_IFTYPE_MONITOR)
239 if (!ieee802154_sdata_running(sdata))
242 skb2 = skb_clone(skb, GFP_ATOMIC);
244 skb2->dev = sdata->dev;
245 ieee802154_deliver_skb(skb2);
247 sdata->dev->stats.rx_packets++;
248 sdata->dev->stats.rx_bytes += skb->len;
253 void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
255 struct ieee802154_local *local = hw_to_local(hw);
258 WARN_ON_ONCE(softirq_count() == 0);
260 /* TODO: When a transceiver omits the checksum here, we
261 * add an own calculated one. This is currently an ugly
262 * solution because the monitor needs a crc here.
264 if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
265 crc = crc_ccitt(0, skb->data, skb->len);
266 put_unaligned_le16(crc, skb_put(skb, 2));
271 ieee802154_monitors_rx(local, skb);
273 /* Check if transceiver doesn't validate the checksum.
274 * If not we validate the checksum here.
276 if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) {
277 crc = crc_ccitt(0, skb->data, skb->len);
285 skb_trim(skb, skb->len - 2);
287 __ieee802154_rx_handle_packet(local, skb);
291 EXPORT_SYMBOL(ieee802154_rx);
294 ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
296 struct ieee802154_local *local = hw_to_local(hw);
298 mac_cb(skb)->lqi = lqi;
299 skb->pkt_type = IEEE802154_RX_MSG;
300 skb_queue_tail(&local->skb_queue, skb);
301 tasklet_schedule(&local->tasklet);
303 EXPORT_SYMBOL(ieee802154_rx_irqsafe);