1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2007-2012 Siemens AG 4 * 5 * Written by: 6 * Pavel Smolenskiy <pavel.smolenskiy@gmail.com> 7 * Maxim Gorbachyov <maxim.gorbachev@siemens.com> 8 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> 9 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/netdevice.h> 15 #include <linux/crc-ccitt.h> 16 #include <asm/unaligned.h> 17 18 #include <net/mac802154.h> 19 #include <net/ieee802154_netdev.h> 20 #include <net/nl802154.h> 21 22 #include "ieee802154_i.h" 23 24 static int ieee802154_deliver_skb(struct sk_buff *skb) 25 { 26 skb->ip_summed = CHECKSUM_UNNECESSARY; 27 skb->protocol = htons(ETH_P_IEEE802154); 28 29 return netif_receive_skb(skb); 30 } 31 32 void mac802154_rx_beacon_worker(struct work_struct *work) 33 { 34 struct ieee802154_local *local = 35 container_of(work, struct ieee802154_local, rx_beacon_work); 36 struct cfg802154_mac_pkt *mac_pkt; 37 38 mac_pkt = list_first_entry_or_null(&local->rx_beacon_list, 39 struct cfg802154_mac_pkt, node); 40 if (!mac_pkt) 41 return; 42 43 mac802154_process_beacon(local, mac_pkt->skb, mac_pkt->page, mac_pkt->channel); 44 45 list_del(&mac_pkt->node); 46 kfree_skb(mac_pkt->skb); 47 kfree(mac_pkt); 48 } 49 50 static bool mac802154_should_answer_beacon_req(struct ieee802154_local *local) 51 { 52 struct cfg802154_beacon_request *beacon_req; 53 unsigned int interval; 54 55 rcu_read_lock(); 56 beacon_req = rcu_dereference(local->beacon_req); 57 if (!beacon_req) { 58 rcu_read_unlock(); 59 return false; 60 } 61 62 interval = beacon_req->interval; 63 rcu_read_unlock(); 64 65 if (!mac802154_is_beaconing(local)) 66 return false; 67 68 return interval == IEEE802154_ACTIVE_SCAN_DURATION; 69 } 70 71 void mac802154_rx_mac_cmd_worker(struct work_struct *work) 72 { 73 struct ieee802154_local *local = 74 container_of(work, struct ieee802154_local, rx_mac_cmd_work); 75 struct cfg802154_mac_pkt *mac_pkt; 76 u8 mac_cmd; 77 int rc; 78 79 mac_pkt = list_first_entry_or_null(&local->rx_mac_cmd_list, 80 struct cfg802154_mac_pkt, node); 81 if (!mac_pkt) 82 return; 83 84 rc = ieee802154_get_mac_cmd(mac_pkt->skb, &mac_cmd); 85 if (rc) 86 goto out; 87 88 switch (mac_cmd) { 89 case IEEE802154_CMD_BEACON_REQ: 90 dev_dbg(&mac_pkt->sdata->dev->dev, "processing BEACON REQ\n"); 91 if (!mac802154_should_answer_beacon_req(local)) 92 break; 93 94 queue_delayed_work(local->mac_wq, &local->beacon_work, 0); 95 break; 96 default: 97 break; 98 } 99 100 out: 101 list_del(&mac_pkt->node); 102 kfree_skb(mac_pkt->skb); 103 kfree(mac_pkt); 104 } 105 106 static int 107 ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata, 108 struct sk_buff *skb, const struct ieee802154_hdr *hdr) 109 { 110 struct wpan_phy *wpan_phy = sdata->local->hw.phy; 111 struct wpan_dev *wpan_dev = &sdata->wpan_dev; 112 struct cfg802154_mac_pkt *mac_pkt; 113 __le16 span, sshort; 114 int rc; 115 116 pr_debug("getting packet via slave interface %s\n", sdata->dev->name); 117 118 span = wpan_dev->pan_id; 119 sshort = wpan_dev->short_addr; 120 121 /* Level 3 filtering: Only beacons are accepted during scans */ 122 if (sdata->required_filtering == IEEE802154_FILTERING_3_SCAN && 123 sdata->required_filtering > wpan_phy->filtering) { 124 if (mac_cb(skb)->type != IEEE802154_FC_TYPE_BEACON) { 125 dev_dbg(&sdata->dev->dev, 126 "drop non-beacon frame (0x%x) during scan\n", 127 mac_cb(skb)->type); 128 goto fail; 129 } 130 } 131 132 switch (mac_cb(skb)->dest.mode) { 133 case IEEE802154_ADDR_NONE: 134 if (hdr->source.mode != IEEE802154_ADDR_NONE) 135 /* FIXME: check if we are PAN coordinator */ 136 skb->pkt_type = PACKET_OTHERHOST; 137 else 138 /* ACK comes with both addresses empty */ 139 skb->pkt_type = PACKET_HOST; 140 break; 141 case IEEE802154_ADDR_LONG: 142 if (mac_cb(skb)->dest.pan_id != span && 143 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) 144 skb->pkt_type = PACKET_OTHERHOST; 145 else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr) 146 skb->pkt_type = PACKET_HOST; 147 else 148 skb->pkt_type = PACKET_OTHERHOST; 149 break; 150 case IEEE802154_ADDR_SHORT: 151 if (mac_cb(skb)->dest.pan_id != span && 152 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST)) 153 skb->pkt_type = PACKET_OTHERHOST; 154 else if (mac_cb(skb)->dest.short_addr == sshort) 155 skb->pkt_type = PACKET_HOST; 156 else if (mac_cb(skb)->dest.short_addr == 157 cpu_to_le16(IEEE802154_ADDR_BROADCAST)) 158 skb->pkt_type = PACKET_BROADCAST; 159 else 160 skb->pkt_type = PACKET_OTHERHOST; 161 break; 162 default: 163 pr_debug("invalid dest mode\n"); 164 goto fail; 165 } 166 167 skb->dev = sdata->dev; 168 169 /* TODO this should be moved after netif_receive_skb call, otherwise 170 * wireshark will show a mac header with security fields and the 171 * payload is already decrypted. 172 */ 173 rc = mac802154_llsec_decrypt(&sdata->sec, skb); 174 if (rc) { 175 pr_debug("decryption failed: %i\n", rc); 176 goto fail; 177 } 178 179 sdata->dev->stats.rx_packets++; 180 sdata->dev->stats.rx_bytes += skb->len; 181 182 switch (mac_cb(skb)->type) { 183 case IEEE802154_FC_TYPE_BEACON: 184 dev_dbg(&sdata->dev->dev, "BEACON received\n"); 185 if (!mac802154_is_scanning(sdata->local)) 186 goto fail; 187 188 mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC); 189 if (!mac_pkt) 190 goto fail; 191 192 mac_pkt->skb = skb_get(skb); 193 mac_pkt->sdata = sdata; 194 mac_pkt->page = sdata->local->scan_page; 195 mac_pkt->channel = sdata->local->scan_channel; 196 list_add_tail(&mac_pkt->node, &sdata->local->rx_beacon_list); 197 queue_work(sdata->local->mac_wq, &sdata->local->rx_beacon_work); 198 return NET_RX_SUCCESS; 199 200 case IEEE802154_FC_TYPE_MAC_CMD: 201 dev_dbg(&sdata->dev->dev, "MAC COMMAND received\n"); 202 mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC); 203 if (!mac_pkt) 204 goto fail; 205 206 mac_pkt->skb = skb_get(skb); 207 mac_pkt->sdata = sdata; 208 list_add_tail(&mac_pkt->node, &sdata->local->rx_mac_cmd_list); 209 queue_work(sdata->local->mac_wq, &sdata->local->rx_mac_cmd_work); 210 return NET_RX_SUCCESS; 211 212 case IEEE802154_FC_TYPE_ACK: 213 goto fail; 214 215 case IEEE802154_FC_TYPE_DATA: 216 return ieee802154_deliver_skb(skb); 217 default: 218 pr_warn_ratelimited("ieee802154: bad frame received " 219 "(type = %d)\n", mac_cb(skb)->type); 220 goto fail; 221 } 222 223 fail: 224 kfree_skb(skb); 225 return NET_RX_DROP; 226 } 227 228 static void 229 ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr) 230 { 231 if (addr->mode == IEEE802154_ADDR_NONE) { 232 pr_debug("%s not present\n", name); 233 return; 234 } 235 236 pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id)); 237 if (addr->mode == IEEE802154_ADDR_SHORT) { 238 pr_debug("%s is short: %04x\n", name, 239 le16_to_cpu(addr->short_addr)); 240 } else { 241 u64 hw = swab64((__force u64)addr->extended_addr); 242 243 pr_debug("%s is hardware: %8phC\n", name, &hw); 244 } 245 } 246 247 static int 248 ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr) 249 { 250 int hlen; 251 struct ieee802154_mac_cb *cb = mac_cb(skb); 252 253 skb_reset_mac_header(skb); 254 255 hlen = ieee802154_hdr_pull(skb, hdr); 256 if (hlen < 0) 257 return -EINVAL; 258 259 skb->mac_len = hlen; 260 261 pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc), 262 hdr->seq); 263 264 cb->type = hdr->fc.type; 265 cb->ackreq = hdr->fc.ack_request; 266 cb->secen = hdr->fc.security_enabled; 267 268 ieee802154_print_addr("destination", &hdr->dest); 269 ieee802154_print_addr("source", &hdr->source); 270 271 cb->source = hdr->source; 272 cb->dest = hdr->dest; 273 274 if (hdr->fc.security_enabled) { 275 u64 key; 276 277 pr_debug("seclevel %i\n", hdr->sec.level); 278 279 switch (hdr->sec.key_id_mode) { 280 case IEEE802154_SCF_KEY_IMPLICIT: 281 pr_debug("implicit key\n"); 282 break; 283 284 case IEEE802154_SCF_KEY_INDEX: 285 pr_debug("key %02x\n", hdr->sec.key_id); 286 break; 287 288 case IEEE802154_SCF_KEY_SHORT_INDEX: 289 pr_debug("key %04x:%04x %02x\n", 290 le32_to_cpu(hdr->sec.short_src) >> 16, 291 le32_to_cpu(hdr->sec.short_src) & 0xffff, 292 hdr->sec.key_id); 293 break; 294 295 case IEEE802154_SCF_KEY_HW_INDEX: 296 key = swab64((__force u64)hdr->sec.extended_src); 297 pr_debug("key source %8phC %02x\n", &key, 298 hdr->sec.key_id); 299 break; 300 } 301 } 302 303 return 0; 304 } 305 306 static void 307 __ieee802154_rx_handle_packet(struct ieee802154_local *local, 308 struct sk_buff *skb) 309 { 310 int ret; 311 struct ieee802154_sub_if_data *sdata; 312 struct ieee802154_hdr hdr; 313 struct sk_buff *skb2; 314 315 ret = ieee802154_parse_frame_start(skb, &hdr); 316 if (ret) { 317 pr_debug("got invalid frame\n"); 318 return; 319 } 320 321 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 322 if (sdata->wpan_dev.iftype == NL802154_IFTYPE_MONITOR) 323 continue; 324 325 if (!ieee802154_sdata_running(sdata)) 326 continue; 327 328 /* Do not deliver packets received on interfaces expecting 329 * AACK=1 if the address filters where disabled. 330 */ 331 if (local->hw.phy->filtering < IEEE802154_FILTERING_4_FRAME_FIELDS && 332 sdata->required_filtering == IEEE802154_FILTERING_4_FRAME_FIELDS) 333 continue; 334 335 skb2 = skb_clone(skb, GFP_ATOMIC); 336 if (skb2) { 337 skb2->dev = sdata->dev; 338 ieee802154_subif_frame(sdata, skb2, &hdr); 339 } 340 } 341 } 342 343 static void 344 ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb) 345 { 346 struct sk_buff *skb2; 347 struct ieee802154_sub_if_data *sdata; 348 349 skb_reset_mac_header(skb); 350 skb->ip_summed = CHECKSUM_UNNECESSARY; 351 skb->pkt_type = PACKET_OTHERHOST; 352 skb->protocol = htons(ETH_P_IEEE802154); 353 354 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 355 if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR) 356 continue; 357 358 if (!ieee802154_sdata_running(sdata)) 359 continue; 360 361 skb2 = skb_clone(skb, GFP_ATOMIC); 362 if (skb2) { 363 skb2->dev = sdata->dev; 364 ieee802154_deliver_skb(skb2); 365 366 sdata->dev->stats.rx_packets++; 367 sdata->dev->stats.rx_bytes += skb->len; 368 } 369 } 370 } 371 372 void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb) 373 { 374 u16 crc; 375 376 WARN_ON_ONCE(softirq_count() == 0); 377 378 if (local->suspended) 379 goto free_skb; 380 381 /* TODO: When a transceiver omits the checksum here, we 382 * add an own calculated one. This is currently an ugly 383 * solution because the monitor needs a crc here. 384 */ 385 if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) { 386 crc = crc_ccitt(0, skb->data, skb->len); 387 put_unaligned_le16(crc, skb_put(skb, 2)); 388 } 389 390 rcu_read_lock(); 391 392 ieee802154_monitors_rx(local, skb); 393 394 /* Level 1 filtering: Check the FCS by software when relevant */ 395 if (local->hw.phy->filtering == IEEE802154_FILTERING_NONE) { 396 crc = crc_ccitt(0, skb->data, skb->len); 397 if (crc) 398 goto drop; 399 } 400 /* remove crc */ 401 skb_trim(skb, skb->len - 2); 402 403 __ieee802154_rx_handle_packet(local, skb); 404 405 drop: 406 rcu_read_unlock(); 407 free_skb: 408 kfree_skb(skb); 409 } 410 411 void 412 ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi) 413 { 414 struct ieee802154_local *local = hw_to_local(hw); 415 struct ieee802154_mac_cb *cb = mac_cb_init(skb); 416 417 cb->lqi = lqi; 418 skb->pkt_type = IEEE802154_RX_MSG; 419 skb_queue_tail(&local->skb_queue, skb); 420 tasklet_schedule(&local->tasklet); 421 } 422 EXPORT_SYMBOL(ieee802154_rx_irqsafe); 423