1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * Copyright (C) 2014 Fraunhofer ITWM 3 * Copyright (C) 2014 Fraunhofer ITWM
4 * 4 *
5 * Written by: 5 * Written by:
6 * Phoebe Buckheister <phoebe.buckheister@itwm 6 * Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
7 */ 7 */
8 8
9 #include <linux/ieee802154.h> 9 #include <linux/ieee802154.h>
10 10
11 #include <net/mac802154.h> 11 #include <net/mac802154.h>
12 #include <net/ieee802154_netdev.h> 12 #include <net/ieee802154_netdev.h>
13 13
14 static int 14 static int
15 ieee802154_hdr_push_addr(u8 *buf, const struct 15 ieee802154_hdr_push_addr(u8 *buf, const struct ieee802154_addr *addr,
16 bool omit_pan) 16 bool omit_pan)
17 { 17 {
18 int pos = 0; 18 int pos = 0;
19 19
20 if (addr->mode == IEEE802154_ADDR_NONE 20 if (addr->mode == IEEE802154_ADDR_NONE)
21 return 0; 21 return 0;
22 22
23 if (!omit_pan) { 23 if (!omit_pan) {
24 memcpy(buf + pos, &addr->pan_i 24 memcpy(buf + pos, &addr->pan_id, 2);
25 pos += 2; 25 pos += 2;
26 } 26 }
27 27
28 switch (addr->mode) { 28 switch (addr->mode) {
29 case IEEE802154_ADDR_SHORT: 29 case IEEE802154_ADDR_SHORT:
30 memcpy(buf + pos, &addr->short 30 memcpy(buf + pos, &addr->short_addr, 2);
31 pos += 2; 31 pos += 2;
32 break; 32 break;
33 33
34 case IEEE802154_ADDR_LONG: 34 case IEEE802154_ADDR_LONG:
35 memcpy(buf + pos, &addr->exten 35 memcpy(buf + pos, &addr->extended_addr, IEEE802154_ADDR_LEN);
36 pos += IEEE802154_ADDR_LEN; 36 pos += IEEE802154_ADDR_LEN;
37 break; 37 break;
38 38
39 default: 39 default:
40 return -EINVAL; 40 return -EINVAL;
41 } 41 }
42 42
43 return pos; 43 return pos;
44 } 44 }
45 45
46 static int 46 static int
47 ieee802154_hdr_push_sechdr(u8 *buf, const stru 47 ieee802154_hdr_push_sechdr(u8 *buf, const struct ieee802154_sechdr *hdr)
48 { 48 {
49 int pos = 5; 49 int pos = 5;
50 50
51 memcpy(buf, hdr, 1); 51 memcpy(buf, hdr, 1);
52 memcpy(buf + 1, &hdr->frame_counter, 4 52 memcpy(buf + 1, &hdr->frame_counter, 4);
53 53
54 switch (hdr->key_id_mode) { 54 switch (hdr->key_id_mode) {
55 case IEEE802154_SCF_KEY_IMPLICIT: 55 case IEEE802154_SCF_KEY_IMPLICIT:
56 return pos; 56 return pos;
57 57
58 case IEEE802154_SCF_KEY_INDEX: 58 case IEEE802154_SCF_KEY_INDEX:
59 break; 59 break;
60 60
61 case IEEE802154_SCF_KEY_SHORT_INDEX: 61 case IEEE802154_SCF_KEY_SHORT_INDEX:
62 memcpy(buf + pos, &hdr->short_ 62 memcpy(buf + pos, &hdr->short_src, 4);
63 pos += 4; 63 pos += 4;
64 break; 64 break;
65 65
66 case IEEE802154_SCF_KEY_HW_INDEX: 66 case IEEE802154_SCF_KEY_HW_INDEX:
67 memcpy(buf + pos, &hdr->extend 67 memcpy(buf + pos, &hdr->extended_src, IEEE802154_ADDR_LEN);
68 pos += IEEE802154_ADDR_LEN; 68 pos += IEEE802154_ADDR_LEN;
69 break; 69 break;
70 } 70 }
71 71
72 buf[pos++] = hdr->key_id; 72 buf[pos++] = hdr->key_id;
73 73
74 return pos; 74 return pos;
75 } 75 }
76 76
77 int 77 int
78 ieee802154_hdr_push(struct sk_buff *skb, struc 78 ieee802154_hdr_push(struct sk_buff *skb, struct ieee802154_hdr *hdr)
79 { 79 {
80 u8 buf[IEEE802154_MAX_HEADER_LEN]; 80 u8 buf[IEEE802154_MAX_HEADER_LEN];
81 int pos = 2; 81 int pos = 2;
82 int rc; 82 int rc;
83 struct ieee802154_hdr_fc *fc = &hdr->f 83 struct ieee802154_hdr_fc *fc = &hdr->fc;
84 84
85 buf[pos++] = hdr->seq; 85 buf[pos++] = hdr->seq;
86 86
87 fc->dest_addr_mode = hdr->dest.mode; 87 fc->dest_addr_mode = hdr->dest.mode;
88 88
89 rc = ieee802154_hdr_push_addr(buf + po 89 rc = ieee802154_hdr_push_addr(buf + pos, &hdr->dest, false);
90 if (rc < 0) 90 if (rc < 0)
91 return -EINVAL; 91 return -EINVAL;
92 pos += rc; 92 pos += rc;
93 93
94 fc->source_addr_mode = hdr->source.mod 94 fc->source_addr_mode = hdr->source.mode;
95 95
96 if (hdr->source.pan_id == hdr->dest.pa 96 if (hdr->source.pan_id == hdr->dest.pan_id &&
97 hdr->dest.mode != IEEE802154_ADDR_ 97 hdr->dest.mode != IEEE802154_ADDR_NONE)
98 fc->intra_pan = true; 98 fc->intra_pan = true;
99 99
100 rc = ieee802154_hdr_push_addr(buf + po 100 rc = ieee802154_hdr_push_addr(buf + pos, &hdr->source, fc->intra_pan);
101 if (rc < 0) 101 if (rc < 0)
102 return -EINVAL; 102 return -EINVAL;
103 pos += rc; 103 pos += rc;
104 104
105 if (fc->security_enabled) { 105 if (fc->security_enabled) {
106 fc->version = 1; 106 fc->version = 1;
107 107
108 rc = ieee802154_hdr_push_sechd 108 rc = ieee802154_hdr_push_sechdr(buf + pos, &hdr->sec);
109 if (rc < 0) 109 if (rc < 0)
110 return -EINVAL; 110 return -EINVAL;
111 111
112 pos += rc; 112 pos += rc;
113 } 113 }
114 114
115 memcpy(buf, fc, 2); 115 memcpy(buf, fc, 2);
116 116
117 memcpy(skb_push(skb, pos), buf, pos); 117 memcpy(skb_push(skb, pos), buf, pos);
118 118
119 return pos; 119 return pos;
120 } 120 }
121 EXPORT_SYMBOL_GPL(ieee802154_hdr_push); 121 EXPORT_SYMBOL_GPL(ieee802154_hdr_push);
122 122
123 int ieee802154_mac_cmd_push(struct sk_buff *sk <<
124 const void *pl, un <<
125 { <<
126 struct ieee802154_mac_cmd_frame *frame <<
127 struct ieee802154_mac_cmd_pl *mac_pl = <<
128 struct ieee802154_hdr *mhr = &frame->m <<
129 int ret; <<
130 <<
131 skb_reserve(skb, sizeof(*mhr)); <<
132 ret = ieee802154_hdr_push(skb, mhr); <<
133 if (ret < 0) <<
134 return ret; <<
135 <<
136 skb_reset_mac_header(skb); <<
137 skb->mac_len = ret; <<
138 <<
139 skb_put_data(skb, mac_pl, sizeof(*mac_ <<
140 skb_put_data(skb, pl, pl_len); <<
141 <<
142 return 0; <<
143 } <<
144 EXPORT_SYMBOL_GPL(ieee802154_mac_cmd_push); <<
145 <<
146 int ieee802154_beacon_push(struct sk_buff *skb <<
147 struct ieee802154_b <<
148 { <<
149 struct ieee802154_beacon_hdr *mac_pl = <<
150 struct ieee802154_hdr *mhr = &beacon-> <<
151 int ret; <<
152 <<
153 skb_reserve(skb, sizeof(*mhr)); <<
154 ret = ieee802154_hdr_push(skb, mhr); <<
155 if (ret < 0) <<
156 return ret; <<
157 <<
158 skb_reset_mac_header(skb); <<
159 skb->mac_len = ret; <<
160 <<
161 skb_put_data(skb, mac_pl, sizeof(*mac_ <<
162 <<
163 if (mac_pl->pend_short_addr_count || m <<
164 return -EOPNOTSUPP; <<
165 <<
166 return 0; <<
167 } <<
168 EXPORT_SYMBOL_GPL(ieee802154_beacon_push); <<
169 <<
170 static int 123 static int
171 ieee802154_hdr_get_addr(const u8 *buf, int mod 124 ieee802154_hdr_get_addr(const u8 *buf, int mode, bool omit_pan,
172 struct ieee802154_addr 125 struct ieee802154_addr *addr)
173 { 126 {
174 int pos = 0; 127 int pos = 0;
175 128
176 addr->mode = mode; 129 addr->mode = mode;
177 130
178 if (mode == IEEE802154_ADDR_NONE) 131 if (mode == IEEE802154_ADDR_NONE)
179 return 0; 132 return 0;
180 133
181 if (!omit_pan) { 134 if (!omit_pan) {
182 memcpy(&addr->pan_id, buf + po 135 memcpy(&addr->pan_id, buf + pos, 2);
183 pos += 2; 136 pos += 2;
184 } 137 }
185 138
186 if (mode == IEEE802154_ADDR_SHORT) { 139 if (mode == IEEE802154_ADDR_SHORT) {
187 memcpy(&addr->short_addr, buf 140 memcpy(&addr->short_addr, buf + pos, 2);
188 return pos + 2; 141 return pos + 2;
189 } else { 142 } else {
190 memcpy(&addr->extended_addr, b 143 memcpy(&addr->extended_addr, buf + pos, IEEE802154_ADDR_LEN);
191 return pos + IEEE802154_ADDR_L 144 return pos + IEEE802154_ADDR_LEN;
192 } 145 }
193 } 146 }
194 147
195 static int ieee802154_hdr_addr_len(int mode, b 148 static int ieee802154_hdr_addr_len(int mode, bool omit_pan)
196 { 149 {
197 int pan_len = omit_pan ? 0 : 2; 150 int pan_len = omit_pan ? 0 : 2;
198 151
199 switch (mode) { 152 switch (mode) {
200 case IEEE802154_ADDR_NONE: return 0; 153 case IEEE802154_ADDR_NONE: return 0;
201 case IEEE802154_ADDR_SHORT: return 2 + 154 case IEEE802154_ADDR_SHORT: return 2 + pan_len;
202 case IEEE802154_ADDR_LONG: return IEEE 155 case IEEE802154_ADDR_LONG: return IEEE802154_ADDR_LEN + pan_len;
203 default: return -EINVAL; 156 default: return -EINVAL;
204 } 157 }
205 } 158 }
206 159
207 static int 160 static int
208 ieee802154_hdr_get_sechdr(const u8 *buf, struc 161 ieee802154_hdr_get_sechdr(const u8 *buf, struct ieee802154_sechdr *hdr)
209 { 162 {
210 int pos = 5; 163 int pos = 5;
211 164
212 memcpy(hdr, buf, 1); 165 memcpy(hdr, buf, 1);
213 memcpy(&hdr->frame_counter, buf + 1, 4 166 memcpy(&hdr->frame_counter, buf + 1, 4);
214 167
215 switch (hdr->key_id_mode) { 168 switch (hdr->key_id_mode) {
216 case IEEE802154_SCF_KEY_IMPLICIT: 169 case IEEE802154_SCF_KEY_IMPLICIT:
217 return pos; 170 return pos;
218 171
219 case IEEE802154_SCF_KEY_INDEX: 172 case IEEE802154_SCF_KEY_INDEX:
220 break; 173 break;
221 174
222 case IEEE802154_SCF_KEY_SHORT_INDEX: 175 case IEEE802154_SCF_KEY_SHORT_INDEX:
223 memcpy(&hdr->short_src, buf + 176 memcpy(&hdr->short_src, buf + pos, 4);
224 pos += 4; 177 pos += 4;
225 break; 178 break;
226 179
227 case IEEE802154_SCF_KEY_HW_INDEX: 180 case IEEE802154_SCF_KEY_HW_INDEX:
228 memcpy(&hdr->extended_src, buf 181 memcpy(&hdr->extended_src, buf + pos, IEEE802154_ADDR_LEN);
229 pos += IEEE802154_ADDR_LEN; 182 pos += IEEE802154_ADDR_LEN;
230 break; 183 break;
231 } 184 }
232 185
233 hdr->key_id = buf[pos++]; 186 hdr->key_id = buf[pos++];
234 187
235 return pos; 188 return pos;
236 } 189 }
237 190
238 static int ieee802154_sechdr_lengths[4] = { 191 static int ieee802154_sechdr_lengths[4] = {
239 [IEEE802154_SCF_KEY_IMPLICIT] = 5, 192 [IEEE802154_SCF_KEY_IMPLICIT] = 5,
240 [IEEE802154_SCF_KEY_INDEX] = 6, 193 [IEEE802154_SCF_KEY_INDEX] = 6,
241 [IEEE802154_SCF_KEY_SHORT_INDEX] = 10, 194 [IEEE802154_SCF_KEY_SHORT_INDEX] = 10,
242 [IEEE802154_SCF_KEY_HW_INDEX] = 14, 195 [IEEE802154_SCF_KEY_HW_INDEX] = 14,
243 }; 196 };
244 197
245 static int ieee802154_hdr_sechdr_len(u8 sc) 198 static int ieee802154_hdr_sechdr_len(u8 sc)
246 { 199 {
247 return ieee802154_sechdr_lengths[IEEE8 200 return ieee802154_sechdr_lengths[IEEE802154_SCF_KEY_ID_MODE(sc)];
248 } 201 }
249 202
250 static int ieee802154_hdr_minlen(const struct 203 static int ieee802154_hdr_minlen(const struct ieee802154_hdr *hdr)
251 { 204 {
252 int dlen, slen; 205 int dlen, slen;
253 206
254 dlen = ieee802154_hdr_addr_len(hdr->fc 207 dlen = ieee802154_hdr_addr_len(hdr->fc.dest_addr_mode, false);
255 slen = ieee802154_hdr_addr_len(hdr->fc 208 slen = ieee802154_hdr_addr_len(hdr->fc.source_addr_mode,
256 hdr->fc 209 hdr->fc.intra_pan);
257 210
258 if (slen < 0 || dlen < 0) 211 if (slen < 0 || dlen < 0)
259 return -EINVAL; 212 return -EINVAL;
260 213
261 return 3 + dlen + slen + hdr->fc.secur 214 return 3 + dlen + slen + hdr->fc.security_enabled;
262 } 215 }
263 216
264 static int 217 static int
265 ieee802154_hdr_get_addrs(const u8 *buf, struct 218 ieee802154_hdr_get_addrs(const u8 *buf, struct ieee802154_hdr *hdr)
266 { 219 {
267 int pos = 0; 220 int pos = 0;
268 221
269 pos += ieee802154_hdr_get_addr(buf + p 222 pos += ieee802154_hdr_get_addr(buf + pos, hdr->fc.dest_addr_mode,
270 false, 223 false, &hdr->dest);
271 pos += ieee802154_hdr_get_addr(buf + p 224 pos += ieee802154_hdr_get_addr(buf + pos, hdr->fc.source_addr_mode,
272 hdr->fc 225 hdr->fc.intra_pan, &hdr->source);
273 226
274 if (hdr->fc.intra_pan) 227 if (hdr->fc.intra_pan)
275 hdr->source.pan_id = hdr->dest 228 hdr->source.pan_id = hdr->dest.pan_id;
276 229
277 return pos; 230 return pos;
278 } 231 }
279 232
280 int 233 int
281 ieee802154_hdr_pull(struct sk_buff *skb, struc 234 ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr)
282 { 235 {
283 int pos = 3, rc; 236 int pos = 3, rc;
284 237
285 if (!pskb_may_pull(skb, 3)) 238 if (!pskb_may_pull(skb, 3))
286 return -EINVAL; 239 return -EINVAL;
287 240
288 memcpy(hdr, skb->data, 3); 241 memcpy(hdr, skb->data, 3);
289 242
290 rc = ieee802154_hdr_minlen(hdr); 243 rc = ieee802154_hdr_minlen(hdr);
291 if (rc < 0 || !pskb_may_pull(skb, rc)) 244 if (rc < 0 || !pskb_may_pull(skb, rc))
292 return -EINVAL; 245 return -EINVAL;
293 246
294 pos += ieee802154_hdr_get_addrs(skb->d 247 pos += ieee802154_hdr_get_addrs(skb->data + pos, hdr);
295 248
296 if (hdr->fc.security_enabled) { 249 if (hdr->fc.security_enabled) {
297 int want = pos + ieee802154_hd 250 int want = pos + ieee802154_hdr_sechdr_len(skb->data[pos]);
298 251
299 if (!pskb_may_pull(skb, want)) 252 if (!pskb_may_pull(skb, want))
300 return -EINVAL; 253 return -EINVAL;
301 254
302 pos += ieee802154_hdr_get_sech 255 pos += ieee802154_hdr_get_sechdr(skb->data + pos, &hdr->sec);
303 } 256 }
304 257
305 skb_pull(skb, pos); 258 skb_pull(skb, pos);
306 return pos; 259 return pos;
307 } 260 }
308 EXPORT_SYMBOL_GPL(ieee802154_hdr_pull); 261 EXPORT_SYMBOL_GPL(ieee802154_hdr_pull);
309 <<
310 int ieee802154_mac_cmd_pl_pull(struct sk_buff <<
311 struct ieee8021 <<
312 { <<
313 if (!pskb_may_pull(skb, sizeof(*mac_pl <<
314 return -EINVAL; <<
315 <<
316 memcpy(mac_pl, skb->data, sizeof(*mac_ <<
317 skb_pull(skb, sizeof(*mac_pl)); <<
318 <<
319 return 0; <<
320 } <<
321 EXPORT_SYMBOL_GPL(ieee802154_mac_cmd_pl_pull); <<
322 262
323 int 263 int
324 ieee802154_hdr_peek_addrs(const struct sk_buff 264 ieee802154_hdr_peek_addrs(const struct sk_buff *skb, struct ieee802154_hdr *hdr)
325 { 265 {
326 const u8 *buf = skb_mac_header(skb); 266 const u8 *buf = skb_mac_header(skb);
327 int pos = 3, rc; 267 int pos = 3, rc;
328 268
329 if (buf + 3 > skb_tail_pointer(skb)) 269 if (buf + 3 > skb_tail_pointer(skb))
330 return -EINVAL; 270 return -EINVAL;
331 271
332 memcpy(hdr, buf, 3); 272 memcpy(hdr, buf, 3);
333 273
334 rc = ieee802154_hdr_minlen(hdr); 274 rc = ieee802154_hdr_minlen(hdr);
335 if (rc < 0 || buf + rc > skb_tail_poin 275 if (rc < 0 || buf + rc > skb_tail_pointer(skb))
336 return -EINVAL; 276 return -EINVAL;
337 277
338 pos += ieee802154_hdr_get_addrs(buf + 278 pos += ieee802154_hdr_get_addrs(buf + pos, hdr);
339 return pos; 279 return pos;
340 } 280 }
341 EXPORT_SYMBOL_GPL(ieee802154_hdr_peek_addrs); 281 EXPORT_SYMBOL_GPL(ieee802154_hdr_peek_addrs);
342 282
343 int 283 int
344 ieee802154_hdr_peek(const struct sk_buff *skb, 284 ieee802154_hdr_peek(const struct sk_buff *skb, struct ieee802154_hdr *hdr)
345 { 285 {
346 const u8 *buf = skb_mac_header(skb); 286 const u8 *buf = skb_mac_header(skb);
347 int pos; 287 int pos;
348 288
349 pos = ieee802154_hdr_peek_addrs(skb, h 289 pos = ieee802154_hdr_peek_addrs(skb, hdr);
350 if (pos < 0) 290 if (pos < 0)
351 return -EINVAL; 291 return -EINVAL;
352 292
353 if (hdr->fc.security_enabled) { 293 if (hdr->fc.security_enabled) {
354 u8 key_id_mode = IEEE802154_SC 294 u8 key_id_mode = IEEE802154_SCF_KEY_ID_MODE(*(buf + pos));
355 int want = pos + ieee802154_se 295 int want = pos + ieee802154_sechdr_lengths[key_id_mode];
356 296
357 if (buf + want > skb_tail_poin 297 if (buf + want > skb_tail_pointer(skb))
358 return -EINVAL; 298 return -EINVAL;
359 299
360 pos += ieee802154_hdr_get_sech 300 pos += ieee802154_hdr_get_sechdr(buf + pos, &hdr->sec);
361 } 301 }
362 302
363 return pos; 303 return pos;
364 } 304 }
365 EXPORT_SYMBOL_GPL(ieee802154_hdr_peek); 305 EXPORT_SYMBOL_GPL(ieee802154_hdr_peek);
366 306
367 int ieee802154_max_payload(const struct ieee80 307 int ieee802154_max_payload(const struct ieee802154_hdr *hdr)
368 { 308 {
369 int hlen = ieee802154_hdr_minlen(hdr); 309 int hlen = ieee802154_hdr_minlen(hdr);
370 310
371 if (hdr->fc.security_enabled) { 311 if (hdr->fc.security_enabled) {
372 hlen += ieee802154_sechdr_leng 312 hlen += ieee802154_sechdr_lengths[hdr->sec.key_id_mode] - 1;
373 hlen += ieee802154_sechdr_auth 313 hlen += ieee802154_sechdr_authtag_len(&hdr->sec);
374 } 314 }
375 315
376 return IEEE802154_MTU - hlen - IEEE802 316 return IEEE802154_MTU - hlen - IEEE802154_MFR_SIZE;
377 } 317 }
378 EXPORT_SYMBOL_GPL(ieee802154_max_payload); 318 EXPORT_SYMBOL_GPL(ieee802154_max_payload);
379 319
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