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Commit | Line | Data |
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1cd829c8 | 1 | /* |
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 | * | |
1cd829c8 | 13 | * 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> | |
1cd829c8 | 22 | #include <linux/netdevice.h> |
23 | #include <linux/crc-ccitt.h> | |
b7889497 | 24 | #include <asm/unaligned.h> |
1cd829c8 | 25 | |
26 | #include <net/mac802154.h> | |
27 | #include <net/ieee802154_netdev.h> | |
944742a3 | 28 | #include <net/nl802154.h> |
1cd829c8 | 29 | |
0f1556bc | 30 | #include "ieee802154_i.h" |
1cd829c8 | 31 | |
08c511a7 | 32 | static int ieee802154_deliver_skb(struct sk_buff *skb) |
2a9820c9 | 33 | { |
75a46f0e | 34 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
702dcf99 AA |
35 | skb->protocol = htons(ETH_P_IEEE802154); |
36 | ||
2a9820c9 AA |
37 | return netif_receive_skb(skb); |
38 | } | |
39 | ||
40 | static int | |
be9d215f AA |
41 | ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata, |
42 | struct sk_buff *skb, const struct ieee802154_hdr *hdr) | |
2a9820c9 | 43 | { |
863e88f2 | 44 | struct wpan_dev *wpan_dev = &sdata->wpan_dev; |
2a9820c9 AA |
45 | __le16 span, sshort; |
46 | int rc; | |
47 | ||
48 | pr_debug("getting packet via slave interface %s\n", sdata->dev->name); | |
49 | ||
863e88f2 AA |
50 | span = wpan_dev->pan_id; |
51 | sshort = wpan_dev->short_addr; | |
2a9820c9 AA |
52 | |
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; | |
863e88f2 | 66 | else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr) |
2a9820c9 AA |
67 | 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: | |
2a9820c9 | 84 | pr_debug("invalid dest mode\n"); |
bcb47aab | 85 | goto fail; |
2a9820c9 AA |
86 | } |
87 | ||
2a9820c9 AA |
88 | 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: | |
08c511a7 | 101 | return ieee802154_deliver_skb(skb); |
2a9820c9 AA |
102 | default: |
103 | pr_warn("ieee802154: bad frame received (type = %d)\n", | |
104 | mac_cb(skb)->type); | |
105 | goto fail; | |
106 | } | |
107 | ||
108 | fail: | |
109 | kfree_skb(skb); | |
110 | return NET_RX_DROP; | |
111 | } | |
112 | ||
be9d215f AA |
113 | static void |
114 | ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr) | |
2a9820c9 AA |
115 | { |
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 | ||
be9d215f AA |
130 | static int |
131 | ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr) | |
2a9820c9 AA |
132 | { |
133 | int hlen; | |
134 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); | |
135 | ||
9cf215d0 AA |
136 | skb_reset_mac_header(skb); |
137 | ||
2a9820c9 AA |
138 | 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 | ||
be9d215f AA |
151 | ieee802154_print_addr("destination", &hdr->dest); |
152 | ieee802154_print_addr("source", &hdr->source); | |
2a9820c9 AA |
153 | |
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 | ||
189 | static void | |
be9d215f AA |
190 | __ieee802154_rx_handle_packet(struct ieee802154_local *local, |
191 | struct sk_buff *skb) | |
2a9820c9 AA |
192 | { |
193 | int ret; | |
194 | struct ieee802154_sub_if_data *sdata; | |
195 | struct ieee802154_hdr hdr; | |
196 | ||
be9d215f | 197 | ret = ieee802154_parse_frame_start(skb, &hdr); |
2a9820c9 AA |
198 | if (ret) { |
199 | pr_debug("got invalid frame\n"); | |
200 | kfree_skb(skb); | |
201 | return; | |
202 | } | |
203 | ||
2a9820c9 | 204 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
1bc1754e VB |
205 | if (sdata->wpan_dev.iftype != NL802154_IFTYPE_NODE) |
206 | continue; | |
207 | ||
208 | if (!ieee802154_sdata_running(sdata)) | |
2a9820c9 AA |
209 | continue; |
210 | ||
be9d215f | 211 | ieee802154_subif_frame(sdata, skb, &hdr); |
2a9820c9 AA |
212 | skb = NULL; |
213 | break; | |
214 | } | |
2a9820c9 AA |
215 | |
216 | if (skb) | |
217 | kfree_skb(skb); | |
218 | } | |
219 | ||
4ca18be5 | 220 | static void |
be9d215f | 221 | ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb) |
2a9820c9 AA |
222 | { |
223 | struct sk_buff *skb2; | |
224 | struct ieee802154_sub_if_data *sdata; | |
2a9820c9 | 225 | |
9cf215d0 | 226 | skb_reset_mac_header(skb); |
75a46f0e | 227 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
c9ca6401 | 228 | skb->pkt_type = PACKET_OTHERHOST; |
702dcf99 AA |
229 | skb->protocol = htons(ETH_P_IEEE802154); |
230 | ||
2a9820c9 | 231 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
ed65963b | 232 | if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR) |
20b48120 AA |
233 | continue; |
234 | ||
235 | if (!ieee802154_sdata_running(sdata)) | |
2a9820c9 AA |
236 | continue; |
237 | ||
238 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
05f7de67 AA |
239 | if (skb2) { |
240 | skb2->dev = sdata->dev; | |
241 | ieee802154_deliver_skb(skb2); | |
2a9820c9 | 242 | |
05f7de67 AA |
243 | sdata->dev->stats.rx_packets++; |
244 | sdata->dev->stats.rx_bytes += skb->len; | |
245 | } | |
2a9820c9 | 246 | } |
2a9820c9 AA |
247 | } |
248 | ||
469100d6 | 249 | void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb) |
1cd829c8 | 250 | { |
60741361 | 251 | struct ieee802154_local *local = hw_to_local(hw); |
ec718f3d | 252 | u16 crc; |
1cd829c8 | 253 | |
469100d6 AA |
254 | WARN_ON_ONCE(softirq_count() == 0); |
255 | ||
b7889497 AA |
256 | /* TODO: When a transceiver omits the checksum here, we |
257 | * add an own calculated one. This is currently an ugly | |
258 | * solution because the monitor needs a crc here. | |
259 | */ | |
260 | if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) { | |
ec718f3d | 261 | crc = crc_ccitt(0, skb->data, skb->len); |
b7889497 | 262 | put_unaligned_le16(crc, skb_put(skb, 2)); |
1cd829c8 | 263 | } |
264 | ||
e176b681 AA |
265 | rcu_read_lock(); |
266 | ||
be9d215f | 267 | ieee802154_monitors_rx(local, skb); |
2d3b5b0a | 268 | |
ec718f3d AA |
269 | /* Check if transceiver doesn't validate the checksum. |
270 | * If not we validate the checksum here. | |
271 | */ | |
272 | if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) { | |
273 | crc = crc_ccitt(0, skb->data, skb->len); | |
274 | if (crc) { | |
275 | rcu_read_unlock(); | |
276 | kfree_skb(skb); | |
277 | return; | |
278 | } | |
279 | } | |
b7889497 AA |
280 | /* remove crc */ |
281 | skb_trim(skb, skb->len - 2); | |
e176b681 | 282 | |
b7889497 | 283 | __ieee802154_rx_handle_packet(local, skb); |
2d3b5b0a | 284 | |
b7889497 | 285 | rcu_read_unlock(); |
1cd829c8 | 286 | } |
c5c47e67 | 287 | EXPORT_SYMBOL(ieee802154_rx); |
1cd829c8 | 288 | |
289 | void | |
5a504397 | 290 | ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi) |
1cd829c8 | 291 | { |
60741361 | 292 | struct ieee802154_local *local = hw_to_local(hw); |
1cd829c8 | 293 | |
c5c47e67 AA |
294 | mac_cb(skb)->lqi = lqi; |
295 | skb->pkt_type = IEEE802154_RX_MSG; | |
296 | skb_queue_tail(&local->skb_queue, skb); | |
297 | tasklet_schedule(&local->tasklet); | |
1cd829c8 | 298 | } |
299 | EXPORT_SYMBOL(ieee802154_rx_irqsafe); |