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alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +00001/*
2 * Copyright (C) 2007-2012 Siemens AG
3 *
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.
7 *
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.
12 *
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +000013 * Written by:
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>
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +000022#include <linux/netdevice.h>
23#include <linux/crc-ccitt.h>
24
25#include <net/mac802154.h>
26#include <net/ieee802154_netdev.h>
Alexander Aring2a9820c2014-10-27 17:13:32 +010027#include <net/rtnetlink.h>
28#include <linux/nl802154.h>
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +000029
Alexander Aring0f1556b2014-10-25 09:41:00 +020030#include "ieee802154_i.h"
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +000031
Alexander Aring08c511a2014-10-29 21:34:35 +010032static int ieee802154_deliver_skb(struct sk_buff *skb)
Alexander Aring2a9820c2014-10-27 17:13:32 +010033{
Alexander Aring75a46f02014-10-27 17:13:36 +010034 skb->ip_summed = CHECKSUM_UNNECESSARY;
Alexander Aring702dcf92014-10-27 17:13:35 +010035 skb->protocol = htons(ETH_P_IEEE802154);
36
Alexander Aring2a9820c2014-10-27 17:13:32 +010037 return netif_receive_skb(skb);
38}
39
40static int
Alexander Aringbe9d2152014-10-27 17:13:43 +010041ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
42 struct sk_buff *skb, const struct ieee802154_hdr *hdr)
Alexander Aring2a9820c2014-10-27 17:13:32 +010043{
44 __le16 span, sshort;
45 int rc;
46
47 pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
48
49 spin_lock_bh(&sdata->mib_lock);
50
51 span = sdata->pan_id;
52 sshort = sdata->short_addr;
53
54 switch (mac_cb(skb)->dest.mode) {
55 case IEEE802154_ADDR_NONE:
56 if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
57 /* FIXME: check if we are PAN coordinator */
58 skb->pkt_type = PACKET_OTHERHOST;
59 else
60 /* ACK comes with both addresses empty */
61 skb->pkt_type = PACKET_HOST;
62 break;
63 case IEEE802154_ADDR_LONG:
64 if (mac_cb(skb)->dest.pan_id != span &&
65 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
66 skb->pkt_type = PACKET_OTHERHOST;
67 else if (mac_cb(skb)->dest.extended_addr == sdata->extended_addr)
68 skb->pkt_type = PACKET_HOST;
69 else
70 skb->pkt_type = PACKET_OTHERHOST;
71 break;
72 case IEEE802154_ADDR_SHORT:
73 if (mac_cb(skb)->dest.pan_id != span &&
74 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
75 skb->pkt_type = PACKET_OTHERHOST;
76 else if (mac_cb(skb)->dest.short_addr == sshort)
77 skb->pkt_type = PACKET_HOST;
78 else if (mac_cb(skb)->dest.short_addr ==
79 cpu_to_le16(IEEE802154_ADDR_BROADCAST))
80 skb->pkt_type = PACKET_BROADCAST;
81 else
82 skb->pkt_type = PACKET_OTHERHOST;
83 break;
84 default:
85 spin_unlock_bh(&sdata->mib_lock);
86 pr_debug("invalid dest mode\n");
87 kfree_skb(skb);
88 return NET_RX_DROP;
89 }
90
91 spin_unlock_bh(&sdata->mib_lock);
92
93 skb->dev = sdata->dev;
94
95 rc = mac802154_llsec_decrypt(&sdata->sec, skb);
96 if (rc) {
97 pr_debug("decryption failed: %i\n", rc);
98 goto fail;
99 }
100
101 sdata->dev->stats.rx_packets++;
102 sdata->dev->stats.rx_bytes += skb->len;
103
104 switch (mac_cb(skb)->type) {
105 case IEEE802154_FC_TYPE_DATA:
Alexander Aring08c511a2014-10-29 21:34:35 +0100106 return ieee802154_deliver_skb(skb);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100107 default:
108 pr_warn("ieee802154: bad frame received (type = %d)\n",
109 mac_cb(skb)->type);
110 goto fail;
111 }
112
113fail:
114 kfree_skb(skb);
115 return NET_RX_DROP;
116}
117
Alexander Aringbe9d2152014-10-27 17:13:43 +0100118static void
119ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr)
Alexander Aring2a9820c2014-10-27 17:13:32 +0100120{
121 if (addr->mode == IEEE802154_ADDR_NONE)
122 pr_debug("%s not present\n", name);
123
124 pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
125 if (addr->mode == IEEE802154_ADDR_SHORT) {
126 pr_debug("%s is short: %04x\n", name,
127 le16_to_cpu(addr->short_addr));
128 } else {
129 u64 hw = swab64((__force u64)addr->extended_addr);
130
131 pr_debug("%s is hardware: %8phC\n", name, &hw);
132 }
133}
134
Alexander Aringbe9d2152014-10-27 17:13:43 +0100135static int
136ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr)
Alexander Aring2a9820c2014-10-27 17:13:32 +0100137{
138 int hlen;
139 struct ieee802154_mac_cb *cb = mac_cb_init(skb);
140
Alexander Aring9cf215d2014-10-27 17:13:38 +0100141 skb_reset_mac_header(skb);
142
Alexander Aring2a9820c2014-10-27 17:13:32 +0100143 hlen = ieee802154_hdr_pull(skb, hdr);
144 if (hlen < 0)
145 return -EINVAL;
146
147 skb->mac_len = hlen;
148
149 pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
150 hdr->seq);
151
152 cb->type = hdr->fc.type;
153 cb->ackreq = hdr->fc.ack_request;
154 cb->secen = hdr->fc.security_enabled;
155
Alexander Aringbe9d2152014-10-27 17:13:43 +0100156 ieee802154_print_addr("destination", &hdr->dest);
157 ieee802154_print_addr("source", &hdr->source);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100158
159 cb->source = hdr->source;
160 cb->dest = hdr->dest;
161
162 if (hdr->fc.security_enabled) {
163 u64 key;
164
165 pr_debug("seclevel %i\n", hdr->sec.level);
166
167 switch (hdr->sec.key_id_mode) {
168 case IEEE802154_SCF_KEY_IMPLICIT:
169 pr_debug("implicit key\n");
170 break;
171
172 case IEEE802154_SCF_KEY_INDEX:
173 pr_debug("key %02x\n", hdr->sec.key_id);
174 break;
175
176 case IEEE802154_SCF_KEY_SHORT_INDEX:
177 pr_debug("key %04x:%04x %02x\n",
178 le32_to_cpu(hdr->sec.short_src) >> 16,
179 le32_to_cpu(hdr->sec.short_src) & 0xffff,
180 hdr->sec.key_id);
181 break;
182
183 case IEEE802154_SCF_KEY_HW_INDEX:
184 key = swab64((__force u64)hdr->sec.extended_src);
185 pr_debug("key source %8phC %02x\n", &key,
186 hdr->sec.key_id);
187 break;
188 }
189 }
190
191 return 0;
192}
193
194static void
Alexander Aringbe9d2152014-10-27 17:13:43 +0100195__ieee802154_rx_handle_packet(struct ieee802154_local *local,
196 struct sk_buff *skb)
Alexander Aring2a9820c2014-10-27 17:13:32 +0100197{
198 int ret;
199 struct ieee802154_sub_if_data *sdata;
200 struct ieee802154_hdr hdr;
201
Alexander Aringbe9d2152014-10-27 17:13:43 +0100202 ret = ieee802154_parse_frame_start(skb, &hdr);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100203 if (ret) {
204 pr_debug("got invalid frame\n");
205 kfree_skb(skb);
206 return;
207 }
208
Alexander Aring2a9820c2014-10-27 17:13:32 +0100209 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
210 if (sdata->type != IEEE802154_DEV_WPAN ||
211 !netif_running(sdata->dev))
212 continue;
213
Alexander Aringbe9d2152014-10-27 17:13:43 +0100214 ieee802154_subif_frame(sdata, skb, &hdr);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100215 skb = NULL;
216 break;
217 }
Alexander Aring2a9820c2014-10-27 17:13:32 +0100218
219 if (skb)
220 kfree_skb(skb);
221}
222
Alexander Aring4ca18be2014-10-27 17:13:33 +0100223static void
Alexander Aringbe9d2152014-10-27 17:13:43 +0100224ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
Alexander Aring2a9820c2014-10-27 17:13:32 +0100225{
226 struct sk_buff *skb2;
227 struct ieee802154_sub_if_data *sdata;
228 u16 crc = crc_ccitt(0, skb->data, skb->len);
229 u8 *data;
230
Alexander Aring9cf215d2014-10-27 17:13:38 +0100231 skb_reset_mac_header(skb);
Alexander Aring75a46f02014-10-27 17:13:36 +0100232 skb->ip_summed = CHECKSUM_UNNECESSARY;
Alexander Aringc9ca6402014-10-27 17:13:37 +0100233 skb->pkt_type = PACKET_OTHERHOST;
Alexander Aring702dcf92014-10-27 17:13:35 +0100234 skb->protocol = htons(ETH_P_IEEE802154);
235
Alexander Aring2a9820c2014-10-27 17:13:32 +0100236 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
237 if (sdata->type != IEEE802154_DEV_MONITOR ||
238 !netif_running(sdata->dev))
239 continue;
240
241 skb2 = skb_clone(skb, GFP_ATOMIC);
242 skb2->dev = sdata->dev;
243 skb2->pkt_type = PACKET_HOST;
244 data = skb_put(skb2, 2);
245 data[0] = crc & 0xff;
246 data[1] = crc >> 8;
247
248 netif_rx_ni(skb2);
249 }
Alexander Aring2a9820c2014-10-27 17:13:32 +0100250}
251
Alexander Aring469100d2014-10-27 17:13:34 +0100252void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000253{
Alexander Aring60741362014-10-25 17:16:39 +0200254 struct ieee802154_local *local = hw_to_local(hw);
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000255
Alexander Aring469100d2014-10-27 17:13:34 +0100256 WARN_ON_ONCE(softirq_count() == 0);
257
Alexander Aring90386a72014-10-29 21:34:34 +0100258 if (!(local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM)) {
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000259 u16 crc;
260
261 if (skb->len < 2) {
262 pr_debug("got invalid frame\n");
Phoebe Buckheister2d3b5b02014-06-11 12:03:07 +0200263 goto fail;
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000264 }
265 crc = crc_ccitt(0, skb->data, skb->len);
266 if (crc) {
267 pr_debug("CRC mismatch\n");
Phoebe Buckheister2d3b5b02014-06-11 12:03:07 +0200268 goto fail;
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000269 }
270 skb_trim(skb, skb->len - 2); /* CRC */
271 }
272
Alexander Aringe176b682014-10-27 17:13:39 +0100273 rcu_read_lock();
274
Alexander Aringbe9d2152014-10-27 17:13:43 +0100275 ieee802154_monitors_rx(local, skb);
276 __ieee802154_rx_handle_packet(local, skb);
Phoebe Buckheister2d3b5b02014-06-11 12:03:07 +0200277
Alexander Aringe176b682014-10-27 17:13:39 +0100278 rcu_read_unlock();
279
Phoebe Buckheister2d3b5b02014-06-11 12:03:07 +0200280 return;
281
282fail:
283 kfree_skb(skb);
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000284}
Alexander Aringc5c47e62014-10-27 17:13:30 +0100285EXPORT_SYMBOL(ieee802154_rx);
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000286
287void
Alexander Aring5a504392014-10-25 17:16:34 +0200288ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000289{
Alexander Aring60741362014-10-25 17:16:39 +0200290 struct ieee802154_local *local = hw_to_local(hw);
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000291
Alexander Aringc5c47e62014-10-27 17:13:30 +0100292 mac_cb(skb)->lqi = lqi;
293 skb->pkt_type = IEEE802154_RX_MSG;
294 skb_queue_tail(&local->skb_queue, skb);
295 tasklet_schedule(&local->tasklet);
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000296}
297EXPORT_SYMBOL(ieee802154_rx_irqsafe);