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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>
Alexander Aringb7889492014-10-29 21:34:36 +010024#include <asm/unaligned.h>
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +000025
26#include <net/mac802154.h>
27#include <net/ieee802154_netdev.h>
Alexander Aring944742a2014-11-17 08:20:49 +010028#include <net/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{
Alexander Aring863e88f2014-11-09 08:36:45 +010044 struct wpan_dev *wpan_dev = &sdata->wpan_dev;
Alexander Aring2a9820c2014-10-27 17:13:32 +010045 __le16 span, sshort;
46 int rc;
47
48 pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
49
Alexander Aring863e88f2014-11-09 08:36:45 +010050 span = wpan_dev->pan_id;
51 sshort = wpan_dev->short_addr;
Alexander Aring2a9820c2014-10-27 17:13:32 +010052
53 switch (mac_cb(skb)->dest.mode) {
54 case IEEE802154_ADDR_NONE:
55 if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
56 /* FIXME: check if we are PAN coordinator */
57 skb->pkt_type = PACKET_OTHERHOST;
58 else
59 /* ACK comes with both addresses empty */
60 skb->pkt_type = PACKET_HOST;
61 break;
62 case IEEE802154_ADDR_LONG:
63 if (mac_cb(skb)->dest.pan_id != span &&
64 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
65 skb->pkt_type = PACKET_OTHERHOST;
Alexander Aring863e88f2014-11-09 08:36:45 +010066 else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
Alexander Aring2a9820c2014-10-27 17:13:32 +010067 skb->pkt_type = PACKET_HOST;
68 else
69 skb->pkt_type = PACKET_OTHERHOST;
70 break;
71 case IEEE802154_ADDR_SHORT:
72 if (mac_cb(skb)->dest.pan_id != span &&
73 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
74 skb->pkt_type = PACKET_OTHERHOST;
75 else if (mac_cb(skb)->dest.short_addr == sshort)
76 skb->pkt_type = PACKET_HOST;
77 else if (mac_cb(skb)->dest.short_addr ==
78 cpu_to_le16(IEEE802154_ADDR_BROADCAST))
79 skb->pkt_type = PACKET_BROADCAST;
80 else
81 skb->pkt_type = PACKET_OTHERHOST;
82 break;
83 default:
Alexander Aring2a9820c2014-10-27 17:13:32 +010084 pr_debug("invalid dest mode\n");
Varka Bhadrambcb47aa2014-12-05 17:19:09 +053085 goto fail;
Alexander Aring2a9820c2014-10-27 17:13:32 +010086 }
87
Alexander Aring2a9820c2014-10-27 17:13:32 +010088 skb->dev = sdata->dev;
89
90 rc = mac802154_llsec_decrypt(&sdata->sec, skb);
91 if (rc) {
92 pr_debug("decryption failed: %i\n", rc);
93 goto fail;
94 }
95
96 sdata->dev->stats.rx_packets++;
97 sdata->dev->stats.rx_bytes += skb->len;
98
99 switch (mac_cb(skb)->type) {
100 case IEEE802154_FC_TYPE_DATA:
Alexander Aring08c511a2014-10-29 21:34:35 +0100101 return ieee802154_deliver_skb(skb);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100102 default:
103 pr_warn("ieee802154: bad frame received (type = %d)\n",
104 mac_cb(skb)->type);
105 goto fail;
106 }
107
108fail:
109 kfree_skb(skb);
110 return NET_RX_DROP;
111}
112
Alexander Aringbe9d2152014-10-27 17:13:43 +0100113static void
114ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr)
Alexander Aring2a9820c2014-10-27 17:13:32 +0100115{
116 if (addr->mode == IEEE802154_ADDR_NONE)
117 pr_debug("%s not present\n", name);
118
119 pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
120 if (addr->mode == IEEE802154_ADDR_SHORT) {
121 pr_debug("%s is short: %04x\n", name,
122 le16_to_cpu(addr->short_addr));
123 } else {
124 u64 hw = swab64((__force u64)addr->extended_addr);
125
126 pr_debug("%s is hardware: %8phC\n", name, &hw);
127 }
128}
129
Alexander Aringbe9d2152014-10-27 17:13:43 +0100130static int
131ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr)
Alexander Aring2a9820c2014-10-27 17:13:32 +0100132{
133 int hlen;
134 struct ieee802154_mac_cb *cb = mac_cb_init(skb);
135
Alexander Aring9cf215d2014-10-27 17:13:38 +0100136 skb_reset_mac_header(skb);
137
Alexander Aring2a9820c2014-10-27 17:13:32 +0100138 hlen = ieee802154_hdr_pull(skb, hdr);
139 if (hlen < 0)
140 return -EINVAL;
141
142 skb->mac_len = hlen;
143
144 pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
145 hdr->seq);
146
147 cb->type = hdr->fc.type;
148 cb->ackreq = hdr->fc.ack_request;
149 cb->secen = hdr->fc.security_enabled;
150
Alexander Aringbe9d2152014-10-27 17:13:43 +0100151 ieee802154_print_addr("destination", &hdr->dest);
152 ieee802154_print_addr("source", &hdr->source);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100153
154 cb->source = hdr->source;
155 cb->dest = hdr->dest;
156
157 if (hdr->fc.security_enabled) {
158 u64 key;
159
160 pr_debug("seclevel %i\n", hdr->sec.level);
161
162 switch (hdr->sec.key_id_mode) {
163 case IEEE802154_SCF_KEY_IMPLICIT:
164 pr_debug("implicit key\n");
165 break;
166
167 case IEEE802154_SCF_KEY_INDEX:
168 pr_debug("key %02x\n", hdr->sec.key_id);
169 break;
170
171 case IEEE802154_SCF_KEY_SHORT_INDEX:
172 pr_debug("key %04x:%04x %02x\n",
173 le32_to_cpu(hdr->sec.short_src) >> 16,
174 le32_to_cpu(hdr->sec.short_src) & 0xffff,
175 hdr->sec.key_id);
176 break;
177
178 case IEEE802154_SCF_KEY_HW_INDEX:
179 key = swab64((__force u64)hdr->sec.extended_src);
180 pr_debug("key source %8phC %02x\n", &key,
181 hdr->sec.key_id);
182 break;
183 }
184 }
185
186 return 0;
187}
188
189static void
Alexander Aringbe9d2152014-10-27 17:13:43 +0100190__ieee802154_rx_handle_packet(struct ieee802154_local *local,
191 struct sk_buff *skb)
Alexander Aring2a9820c2014-10-27 17:13:32 +0100192{
193 int ret;
194 struct ieee802154_sub_if_data *sdata;
195 struct ieee802154_hdr hdr;
196
Alexander Aringbe9d2152014-10-27 17:13:43 +0100197 ret = ieee802154_parse_frame_start(skb, &hdr);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100198 if (ret) {
199 pr_debug("got invalid frame\n");
200 kfree_skb(skb);
201 return;
202 }
203
Alexander Aring2a9820c2014-10-27 17:13:32 +0100204 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Varka Bhadram1bc17542015-06-12 12:44:24 +0530205 if (sdata->wpan_dev.iftype != NL802154_IFTYPE_NODE)
206 continue;
207
208 if (!ieee802154_sdata_running(sdata))
Alexander Aring2a9820c2014-10-27 17:13:32 +0100209 continue;
210
Alexander Aringbe9d2152014-10-27 17:13:43 +0100211 ieee802154_subif_frame(sdata, skb, &hdr);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100212 skb = NULL;
213 break;
214 }
Alexander Aring2a9820c2014-10-27 17:13:32 +0100215
216 if (skb)
217 kfree_skb(skb);
218}
219
Alexander Aring4ca18be2014-10-27 17:13:33 +0100220static void
Alexander Aringbe9d2152014-10-27 17:13:43 +0100221ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
Alexander Aring2a9820c2014-10-27 17:13:32 +0100222{
223 struct sk_buff *skb2;
224 struct ieee802154_sub_if_data *sdata;
Alexander Aring2a9820c2014-10-27 17:13:32 +0100225
Alexander Aring9cf215d2014-10-27 17:13:38 +0100226 skb_reset_mac_header(skb);
Alexander Aring75a46f02014-10-27 17:13:36 +0100227 skb->ip_summed = CHECKSUM_UNNECESSARY;
Alexander Aringc9ca6402014-10-27 17:13:37 +0100228 skb->pkt_type = PACKET_OTHERHOST;
Alexander Aring702dcf92014-10-27 17:13:35 +0100229 skb->protocol = htons(ETH_P_IEEE802154);
230
Alexander Aring2a9820c2014-10-27 17:13:32 +0100231 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Alexander Aringed659632015-06-06 17:30:46 +0200232 if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR)
Alexander Aring20b48122014-10-29 21:34:41 +0100233 continue;
234
235 if (!ieee802154_sdata_running(sdata))
Alexander Aring2a9820c2014-10-27 17:13:32 +0100236 continue;
237
238 skb2 = skb_clone(skb, GFP_ATOMIC);
Alexander Aring05f7de62014-10-29 21:34:42 +0100239 if (skb2) {
240 skb2->dev = sdata->dev;
241 ieee802154_deliver_skb(skb2);
Alexander Aring2a9820c2014-10-27 17:13:32 +0100242
Alexander Aring05f7de62014-10-29 21:34:42 +0100243 sdata->dev->stats.rx_packets++;
244 sdata->dev->stats.rx_bytes += skb->len;
245 }
Alexander Aring2a9820c2014-10-27 17:13:32 +0100246 }
Alexander Aring2a9820c2014-10-27 17:13:32 +0100247}
248
Varka Bhadramd10270c2015-07-07 10:50:43 +0530249void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb)
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000250{
Alexander Aringec718f32014-10-29 21:34:37 +0100251 u16 crc;
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000252
Alexander Aring469100d2014-10-27 17:13:34 +0100253 WARN_ON_ONCE(softirq_count() == 0);
254
Alexander Aring3cf24cf2015-06-24 11:36:36 +0200255 if (local->suspended)
256 goto drop;
257
Alexander Aringb7889492014-10-29 21:34:36 +0100258 /* TODO: When a transceiver omits the checksum here, we
259 * add an own calculated one. This is currently an ugly
260 * solution because the monitor needs a crc here.
261 */
262 if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
Alexander Aringec718f32014-10-29 21:34:37 +0100263 crc = crc_ccitt(0, skb->data, skb->len);
Alexander Aringb7889492014-10-29 21:34:36 +0100264 put_unaligned_le16(crc, skb_put(skb, 2));
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000265 }
266
Alexander Aringe176b682014-10-27 17:13:39 +0100267 rcu_read_lock();
268
Alexander Aringbe9d2152014-10-27 17:13:43 +0100269 ieee802154_monitors_rx(local, skb);
Alexander Aringb7889492014-10-29 21:34:36 +0100270
Alexander Aringec718f32014-10-29 21:34:37 +0100271 /* Check if transceiver doesn't validate the checksum.
272 * If not we validate the checksum here.
273 */
274 if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) {
275 crc = crc_ccitt(0, skb->data, skb->len);
276 if (crc) {
277 rcu_read_unlock();
Alexander Aring3cf24cf2015-06-24 11:36:36 +0200278 goto drop;
Alexander Aringec718f32014-10-29 21:34:37 +0100279 }
280 }
Alexander Aringb7889492014-10-29 21:34:36 +0100281 /* remove crc */
282 skb_trim(skb, skb->len - 2);
283
Alexander Aringbe9d2152014-10-27 17:13:43 +0100284 __ieee802154_rx_handle_packet(local, skb);
Phoebe Buckheister2d3b5b02014-06-11 12:03:07 +0200285
Alexander Aringe176b682014-10-27 17:13:39 +0100286 rcu_read_unlock();
Alexander Aring3cf24cf2015-06-24 11:36:36 +0200287
288 return;
289drop:
290 kfree_skb(skb);
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000291}
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000292
293void
Alexander Aring5a504392014-10-25 17:16:34 +0200294ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000295{
Alexander Aring60741362014-10-25 17:16:39 +0200296 struct ieee802154_local *local = hw_to_local(hw);
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000297
Alexander Aringc5c47e62014-10-27 17:13:30 +0100298 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);
alex.bluesman.smirnov@gmail.com1cd829c2012-05-15 20:50:21 +0000302}
303EXPORT_SYMBOL(ieee802154_rx_irqsafe);