| 1 | /* |
| 2 | Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved. |
| 3 | Copyright (c) 2011,2012 Intel Corp. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License version 2 and |
| 7 | only version 2 as published by the Free Software Foundation. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | */ |
| 14 | |
| 15 | #include <net/bluetooth/bluetooth.h> |
| 16 | #include <net/bluetooth/hci_core.h> |
| 17 | #include <net/bluetooth/l2cap.h> |
| 18 | |
| 19 | #include "a2mp.h" |
| 20 | #include "amp.h" |
| 21 | |
| 22 | #define A2MP_FEAT_EXT 0x8000 |
| 23 | |
| 24 | /* Global AMP Manager list */ |
| 25 | static LIST_HEAD(amp_mgr_list); |
| 26 | static DEFINE_MUTEX(amp_mgr_list_lock); |
| 27 | |
| 28 | /* A2MP build & send command helper functions */ |
| 29 | static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data) |
| 30 | { |
| 31 | struct a2mp_cmd *cmd; |
| 32 | int plen; |
| 33 | |
| 34 | plen = sizeof(*cmd) + len; |
| 35 | cmd = kzalloc(plen, GFP_KERNEL); |
| 36 | if (!cmd) |
| 37 | return NULL; |
| 38 | |
| 39 | cmd->code = code; |
| 40 | cmd->ident = ident; |
| 41 | cmd->len = cpu_to_le16(len); |
| 42 | |
| 43 | memcpy(cmd->data, data, len); |
| 44 | |
| 45 | return cmd; |
| 46 | } |
| 47 | |
| 48 | static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data) |
| 49 | { |
| 50 | struct l2cap_chan *chan = mgr->a2mp_chan; |
| 51 | struct a2mp_cmd *cmd; |
| 52 | u16 total_len = len + sizeof(*cmd); |
| 53 | struct kvec iv; |
| 54 | struct msghdr msg; |
| 55 | |
| 56 | cmd = __a2mp_build(code, ident, len, data); |
| 57 | if (!cmd) |
| 58 | return; |
| 59 | |
| 60 | iv.iov_base = cmd; |
| 61 | iv.iov_len = total_len; |
| 62 | |
| 63 | memset(&msg, 0, sizeof(msg)); |
| 64 | |
| 65 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, total_len); |
| 66 | |
| 67 | l2cap_chan_send(chan, &msg, total_len); |
| 68 | |
| 69 | kfree(cmd); |
| 70 | } |
| 71 | |
| 72 | static u8 __next_ident(struct amp_mgr *mgr) |
| 73 | { |
| 74 | if (++mgr->ident == 0) |
| 75 | mgr->ident = 1; |
| 76 | |
| 77 | return mgr->ident; |
| 78 | } |
| 79 | |
| 80 | static struct amp_mgr *amp_mgr_lookup_by_state(u8 state) |
| 81 | { |
| 82 | struct amp_mgr *mgr; |
| 83 | |
| 84 | mutex_lock(&_mgr_list_lock); |
| 85 | list_for_each_entry(mgr, &_mgr_list, list) { |
| 86 | if (test_and_clear_bit(state, &mgr->state)) { |
| 87 | amp_mgr_get(mgr); |
| 88 | mutex_unlock(&_mgr_list_lock); |
| 89 | return mgr; |
| 90 | } |
| 91 | } |
| 92 | mutex_unlock(&_mgr_list_lock); |
| 93 | |
| 94 | return NULL; |
| 95 | } |
| 96 | |
| 97 | /* hci_dev_list shall be locked */ |
| 98 | static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl) |
| 99 | { |
| 100 | struct hci_dev *hdev; |
| 101 | int i = 1; |
| 102 | |
| 103 | cl[0].id = AMP_ID_BREDR; |
| 104 | cl[0].type = AMP_TYPE_BREDR; |
| 105 | cl[0].status = AMP_STATUS_BLUETOOTH_ONLY; |
| 106 | |
| 107 | list_for_each_entry(hdev, &hci_dev_list, list) { |
| 108 | if (hdev->dev_type == HCI_AMP) { |
| 109 | cl[i].id = hdev->id; |
| 110 | cl[i].type = hdev->amp_type; |
| 111 | if (test_bit(HCI_UP, &hdev->flags)) |
| 112 | cl[i].status = hdev->amp_status; |
| 113 | else |
| 114 | cl[i].status = AMP_STATUS_POWERED_DOWN; |
| 115 | i++; |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | /* Processing A2MP messages */ |
| 121 | static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb, |
| 122 | struct a2mp_cmd *hdr) |
| 123 | { |
| 124 | struct a2mp_cmd_rej *rej = (void *) skb->data; |
| 125 | |
| 126 | if (le16_to_cpu(hdr->len) < sizeof(*rej)) |
| 127 | return -EINVAL; |
| 128 | |
| 129 | BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason)); |
| 130 | |
| 131 | skb_pull(skb, sizeof(*rej)); |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 137 | struct a2mp_cmd *hdr) |
| 138 | { |
| 139 | struct a2mp_discov_req *req = (void *) skb->data; |
| 140 | u16 len = le16_to_cpu(hdr->len); |
| 141 | struct a2mp_discov_rsp *rsp; |
| 142 | u16 ext_feat; |
| 143 | u8 num_ctrl; |
| 144 | struct hci_dev *hdev; |
| 145 | |
| 146 | if (len < sizeof(*req)) |
| 147 | return -EINVAL; |
| 148 | |
| 149 | skb_pull(skb, sizeof(*req)); |
| 150 | |
| 151 | ext_feat = le16_to_cpu(req->ext_feat); |
| 152 | |
| 153 | BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat); |
| 154 | |
| 155 | /* check that packet is not broken for now */ |
| 156 | while (ext_feat & A2MP_FEAT_EXT) { |
| 157 | if (len < sizeof(ext_feat)) |
| 158 | return -EINVAL; |
| 159 | |
| 160 | ext_feat = get_unaligned_le16(skb->data); |
| 161 | BT_DBG("efm 0x%4.4x", ext_feat); |
| 162 | len -= sizeof(ext_feat); |
| 163 | skb_pull(skb, sizeof(ext_feat)); |
| 164 | } |
| 165 | |
| 166 | read_lock(&hci_dev_list_lock); |
| 167 | |
| 168 | /* at minimum the BR/EDR needs to be listed */ |
| 169 | num_ctrl = 1; |
| 170 | |
| 171 | list_for_each_entry(hdev, &hci_dev_list, list) { |
| 172 | if (hdev->dev_type == HCI_AMP) |
| 173 | num_ctrl++; |
| 174 | } |
| 175 | |
| 176 | len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp); |
| 177 | rsp = kmalloc(len, GFP_ATOMIC); |
| 178 | if (!rsp) { |
| 179 | read_unlock(&hci_dev_list_lock); |
| 180 | return -ENOMEM; |
| 181 | } |
| 182 | |
| 183 | rsp->mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU); |
| 184 | rsp->ext_feat = 0; |
| 185 | |
| 186 | __a2mp_add_cl(mgr, rsp->cl); |
| 187 | |
| 188 | read_unlock(&hci_dev_list_lock); |
| 189 | |
| 190 | a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp); |
| 191 | |
| 192 | kfree(rsp); |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| 197 | struct a2mp_cmd *hdr) |
| 198 | { |
| 199 | struct a2mp_discov_rsp *rsp = (void *) skb->data; |
| 200 | u16 len = le16_to_cpu(hdr->len); |
| 201 | struct a2mp_cl *cl; |
| 202 | u16 ext_feat; |
| 203 | bool found = false; |
| 204 | |
| 205 | if (len < sizeof(*rsp)) |
| 206 | return -EINVAL; |
| 207 | |
| 208 | len -= sizeof(*rsp); |
| 209 | skb_pull(skb, sizeof(*rsp)); |
| 210 | |
| 211 | ext_feat = le16_to_cpu(rsp->ext_feat); |
| 212 | |
| 213 | BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat); |
| 214 | |
| 215 | /* check that packet is not broken for now */ |
| 216 | while (ext_feat & A2MP_FEAT_EXT) { |
| 217 | if (len < sizeof(ext_feat)) |
| 218 | return -EINVAL; |
| 219 | |
| 220 | ext_feat = get_unaligned_le16(skb->data); |
| 221 | BT_DBG("efm 0x%4.4x", ext_feat); |
| 222 | len -= sizeof(ext_feat); |
| 223 | skb_pull(skb, sizeof(ext_feat)); |
| 224 | } |
| 225 | |
| 226 | cl = (void *) skb->data; |
| 227 | while (len >= sizeof(*cl)) { |
| 228 | BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type, |
| 229 | cl->status); |
| 230 | |
| 231 | if (cl->id != AMP_ID_BREDR && cl->type != AMP_TYPE_BREDR) { |
| 232 | struct a2mp_info_req req; |
| 233 | |
| 234 | found = true; |
| 235 | req.id = cl->id; |
| 236 | a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr), |
| 237 | sizeof(req), &req); |
| 238 | } |
| 239 | |
| 240 | len -= sizeof(*cl); |
| 241 | cl = (void *) skb_pull(skb, sizeof(*cl)); |
| 242 | } |
| 243 | |
| 244 | /* Fall back to L2CAP init sequence */ |
| 245 | if (!found) { |
| 246 | struct l2cap_conn *conn = mgr->l2cap_conn; |
| 247 | struct l2cap_chan *chan; |
| 248 | |
| 249 | mutex_lock(&conn->chan_lock); |
| 250 | |
| 251 | list_for_each_entry(chan, &conn->chan_l, list) { |
| 252 | |
| 253 | BT_DBG("chan %p state %s", chan, |
| 254 | state_to_string(chan->state)); |
| 255 | |
| 256 | if (chan->scid == L2CAP_CID_A2MP) |
| 257 | continue; |
| 258 | |
| 259 | l2cap_chan_lock(chan); |
| 260 | |
| 261 | if (chan->state == BT_CONNECT) |
| 262 | l2cap_send_conn_req(chan); |
| 263 | |
| 264 | l2cap_chan_unlock(chan); |
| 265 | } |
| 266 | |
| 267 | mutex_unlock(&conn->chan_lock); |
| 268 | } |
| 269 | |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb, |
| 274 | struct a2mp_cmd *hdr) |
| 275 | { |
| 276 | struct a2mp_cl *cl = (void *) skb->data; |
| 277 | |
| 278 | while (skb->len >= sizeof(*cl)) { |
| 279 | BT_DBG("Controller id %d type %d status %d", cl->id, cl->type, |
| 280 | cl->status); |
| 281 | cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl)); |
| 282 | } |
| 283 | |
| 284 | /* TODO send A2MP_CHANGE_RSP */ |
| 285 | |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 290 | struct a2mp_cmd *hdr) |
| 291 | { |
| 292 | struct a2mp_info_req *req = (void *) skb->data; |
| 293 | struct hci_dev *hdev; |
| 294 | |
| 295 | if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| 296 | return -EINVAL; |
| 297 | |
| 298 | BT_DBG("id %d", req->id); |
| 299 | |
| 300 | hdev = hci_dev_get(req->id); |
| 301 | if (!hdev || hdev->dev_type != HCI_AMP) { |
| 302 | struct a2mp_info_rsp rsp; |
| 303 | |
| 304 | rsp.id = req->id; |
| 305 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 306 | |
| 307 | a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp), |
| 308 | &rsp); |
| 309 | |
| 310 | goto done; |
| 311 | } |
| 312 | |
| 313 | set_bit(READ_LOC_AMP_INFO, &mgr->state); |
| 314 | hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL); |
| 315 | |
| 316 | done: |
| 317 | if (hdev) |
| 318 | hci_dev_put(hdev); |
| 319 | |
| 320 | skb_pull(skb, sizeof(*req)); |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| 325 | struct a2mp_cmd *hdr) |
| 326 | { |
| 327 | struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data; |
| 328 | struct a2mp_amp_assoc_req req; |
| 329 | struct amp_ctrl *ctrl; |
| 330 | |
| 331 | if (le16_to_cpu(hdr->len) < sizeof(*rsp)) |
| 332 | return -EINVAL; |
| 333 | |
| 334 | BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status); |
| 335 | |
| 336 | if (rsp->status) |
| 337 | return -EINVAL; |
| 338 | |
| 339 | ctrl = amp_ctrl_add(mgr, rsp->id); |
| 340 | if (!ctrl) |
| 341 | return -ENOMEM; |
| 342 | |
| 343 | req.id = rsp->id; |
| 344 | a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req), |
| 345 | &req); |
| 346 | |
| 347 | skb_pull(skb, sizeof(*rsp)); |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 352 | struct a2mp_cmd *hdr) |
| 353 | { |
| 354 | struct a2mp_amp_assoc_req *req = (void *) skb->data; |
| 355 | struct hci_dev *hdev; |
| 356 | struct amp_mgr *tmp; |
| 357 | |
| 358 | if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| 359 | return -EINVAL; |
| 360 | |
| 361 | BT_DBG("id %d", req->id); |
| 362 | |
| 363 | /* Make sure that other request is not processed */ |
| 364 | tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC); |
| 365 | |
| 366 | hdev = hci_dev_get(req->id); |
| 367 | if (!hdev || hdev->amp_type == AMP_TYPE_BREDR || tmp) { |
| 368 | struct a2mp_amp_assoc_rsp rsp; |
| 369 | rsp.id = req->id; |
| 370 | |
| 371 | if (tmp) { |
| 372 | rsp.status = A2MP_STATUS_COLLISION_OCCURED; |
| 373 | amp_mgr_put(tmp); |
| 374 | } else { |
| 375 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 376 | } |
| 377 | |
| 378 | a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp), |
| 379 | &rsp); |
| 380 | |
| 381 | goto done; |
| 382 | } |
| 383 | |
| 384 | amp_read_loc_assoc(hdev, mgr); |
| 385 | |
| 386 | done: |
| 387 | if (hdev) |
| 388 | hci_dev_put(hdev); |
| 389 | |
| 390 | skb_pull(skb, sizeof(*req)); |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| 395 | struct a2mp_cmd *hdr) |
| 396 | { |
| 397 | struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data; |
| 398 | u16 len = le16_to_cpu(hdr->len); |
| 399 | struct hci_dev *hdev; |
| 400 | struct amp_ctrl *ctrl; |
| 401 | struct hci_conn *hcon; |
| 402 | size_t assoc_len; |
| 403 | |
| 404 | if (len < sizeof(*rsp)) |
| 405 | return -EINVAL; |
| 406 | |
| 407 | assoc_len = len - sizeof(*rsp); |
| 408 | |
| 409 | BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status, |
| 410 | assoc_len); |
| 411 | |
| 412 | if (rsp->status) |
| 413 | return -EINVAL; |
| 414 | |
| 415 | /* Save remote ASSOC data */ |
| 416 | ctrl = amp_ctrl_lookup(mgr, rsp->id); |
| 417 | if (ctrl) { |
| 418 | u8 *assoc; |
| 419 | |
| 420 | assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL); |
| 421 | if (!assoc) { |
| 422 | amp_ctrl_put(ctrl); |
| 423 | return -ENOMEM; |
| 424 | } |
| 425 | |
| 426 | ctrl->assoc = assoc; |
| 427 | ctrl->assoc_len = assoc_len; |
| 428 | ctrl->assoc_rem_len = assoc_len; |
| 429 | ctrl->assoc_len_so_far = 0; |
| 430 | |
| 431 | amp_ctrl_put(ctrl); |
| 432 | } |
| 433 | |
| 434 | /* Create Phys Link */ |
| 435 | hdev = hci_dev_get(rsp->id); |
| 436 | if (!hdev) |
| 437 | return -EINVAL; |
| 438 | |
| 439 | hcon = phylink_add(hdev, mgr, rsp->id, true); |
| 440 | if (!hcon) |
| 441 | goto done; |
| 442 | |
| 443 | BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id); |
| 444 | |
| 445 | mgr->bredr_chan->remote_amp_id = rsp->id; |
| 446 | |
| 447 | amp_create_phylink(hdev, mgr, hcon); |
| 448 | |
| 449 | done: |
| 450 | hci_dev_put(hdev); |
| 451 | skb_pull(skb, len); |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 456 | struct a2mp_cmd *hdr) |
| 457 | { |
| 458 | struct a2mp_physlink_req *req = (void *) skb->data; |
| 459 | |
| 460 | struct a2mp_physlink_rsp rsp; |
| 461 | struct hci_dev *hdev; |
| 462 | struct hci_conn *hcon; |
| 463 | struct amp_ctrl *ctrl; |
| 464 | |
| 465 | if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| 466 | return -EINVAL; |
| 467 | |
| 468 | BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id); |
| 469 | |
| 470 | rsp.local_id = req->remote_id; |
| 471 | rsp.remote_id = req->local_id; |
| 472 | |
| 473 | hdev = hci_dev_get(req->remote_id); |
| 474 | if (!hdev || hdev->amp_type == AMP_TYPE_BREDR) { |
| 475 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 476 | goto send_rsp; |
| 477 | } |
| 478 | |
| 479 | ctrl = amp_ctrl_lookup(mgr, rsp.remote_id); |
| 480 | if (!ctrl) { |
| 481 | ctrl = amp_ctrl_add(mgr, rsp.remote_id); |
| 482 | if (ctrl) { |
| 483 | amp_ctrl_get(ctrl); |
| 484 | } else { |
| 485 | rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION; |
| 486 | goto send_rsp; |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | if (ctrl) { |
| 491 | size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req); |
| 492 | u8 *assoc; |
| 493 | |
| 494 | assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL); |
| 495 | if (!assoc) { |
| 496 | amp_ctrl_put(ctrl); |
| 497 | return -ENOMEM; |
| 498 | } |
| 499 | |
| 500 | ctrl->assoc = assoc; |
| 501 | ctrl->assoc_len = assoc_len; |
| 502 | ctrl->assoc_rem_len = assoc_len; |
| 503 | ctrl->assoc_len_so_far = 0; |
| 504 | |
| 505 | amp_ctrl_put(ctrl); |
| 506 | } |
| 507 | |
| 508 | hcon = phylink_add(hdev, mgr, req->local_id, false); |
| 509 | if (hcon) { |
| 510 | amp_accept_phylink(hdev, mgr, hcon); |
| 511 | rsp.status = A2MP_STATUS_SUCCESS; |
| 512 | } else { |
| 513 | rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION; |
| 514 | } |
| 515 | |
| 516 | send_rsp: |
| 517 | if (hdev) |
| 518 | hci_dev_put(hdev); |
| 519 | |
| 520 | /* Reply error now and success after HCI Write Remote AMP Assoc |
| 521 | command complete with success status |
| 522 | */ |
| 523 | if (rsp.status != A2MP_STATUS_SUCCESS) { |
| 524 | a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident, |
| 525 | sizeof(rsp), &rsp); |
| 526 | } else { |
| 527 | set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state); |
| 528 | mgr->ident = hdr->ident; |
| 529 | } |
| 530 | |
| 531 | skb_pull(skb, le16_to_cpu(hdr->len)); |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb, |
| 536 | struct a2mp_cmd *hdr) |
| 537 | { |
| 538 | struct a2mp_physlink_req *req = (void *) skb->data; |
| 539 | struct a2mp_physlink_rsp rsp; |
| 540 | struct hci_dev *hdev; |
| 541 | struct hci_conn *hcon; |
| 542 | |
| 543 | if (le16_to_cpu(hdr->len) < sizeof(*req)) |
| 544 | return -EINVAL; |
| 545 | |
| 546 | BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id); |
| 547 | |
| 548 | rsp.local_id = req->remote_id; |
| 549 | rsp.remote_id = req->local_id; |
| 550 | rsp.status = A2MP_STATUS_SUCCESS; |
| 551 | |
| 552 | hdev = hci_dev_get(req->remote_id); |
| 553 | if (!hdev) { |
| 554 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 555 | goto send_rsp; |
| 556 | } |
| 557 | |
| 558 | hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
| 559 | &mgr->l2cap_conn->hcon->dst); |
| 560 | if (!hcon) { |
| 561 | BT_ERR("No phys link exist"); |
| 562 | rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS; |
| 563 | goto clean; |
| 564 | } |
| 565 | |
| 566 | /* TODO Disconnect Phys Link here */ |
| 567 | |
| 568 | clean: |
| 569 | hci_dev_put(hdev); |
| 570 | |
| 571 | send_rsp: |
| 572 | a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp); |
| 573 | |
| 574 | skb_pull(skb, sizeof(*req)); |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb, |
| 579 | struct a2mp_cmd *hdr) |
| 580 | { |
| 581 | BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code); |
| 582 | |
| 583 | skb_pull(skb, le16_to_cpu(hdr->len)); |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | /* Handle A2MP signalling */ |
| 588 | static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
| 589 | { |
| 590 | struct a2mp_cmd *hdr; |
| 591 | struct amp_mgr *mgr = chan->data; |
| 592 | int err = 0; |
| 593 | |
| 594 | amp_mgr_get(mgr); |
| 595 | |
| 596 | while (skb->len >= sizeof(*hdr)) { |
| 597 | u16 len; |
| 598 | |
| 599 | hdr = (void *) skb->data; |
| 600 | len = le16_to_cpu(hdr->len); |
| 601 | |
| 602 | BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len); |
| 603 | |
| 604 | skb_pull(skb, sizeof(*hdr)); |
| 605 | |
| 606 | if (len > skb->len || !hdr->ident) { |
| 607 | err = -EINVAL; |
| 608 | break; |
| 609 | } |
| 610 | |
| 611 | mgr->ident = hdr->ident; |
| 612 | |
| 613 | switch (hdr->code) { |
| 614 | case A2MP_COMMAND_REJ: |
| 615 | a2mp_command_rej(mgr, skb, hdr); |
| 616 | break; |
| 617 | |
| 618 | case A2MP_DISCOVER_REQ: |
| 619 | err = a2mp_discover_req(mgr, skb, hdr); |
| 620 | break; |
| 621 | |
| 622 | case A2MP_CHANGE_NOTIFY: |
| 623 | err = a2mp_change_notify(mgr, skb, hdr); |
| 624 | break; |
| 625 | |
| 626 | case A2MP_GETINFO_REQ: |
| 627 | err = a2mp_getinfo_req(mgr, skb, hdr); |
| 628 | break; |
| 629 | |
| 630 | case A2MP_GETAMPASSOC_REQ: |
| 631 | err = a2mp_getampassoc_req(mgr, skb, hdr); |
| 632 | break; |
| 633 | |
| 634 | case A2MP_CREATEPHYSLINK_REQ: |
| 635 | err = a2mp_createphyslink_req(mgr, skb, hdr); |
| 636 | break; |
| 637 | |
| 638 | case A2MP_DISCONNPHYSLINK_REQ: |
| 639 | err = a2mp_discphyslink_req(mgr, skb, hdr); |
| 640 | break; |
| 641 | |
| 642 | case A2MP_DISCOVER_RSP: |
| 643 | err = a2mp_discover_rsp(mgr, skb, hdr); |
| 644 | break; |
| 645 | |
| 646 | case A2MP_GETINFO_RSP: |
| 647 | err = a2mp_getinfo_rsp(mgr, skb, hdr); |
| 648 | break; |
| 649 | |
| 650 | case A2MP_GETAMPASSOC_RSP: |
| 651 | err = a2mp_getampassoc_rsp(mgr, skb, hdr); |
| 652 | break; |
| 653 | |
| 654 | case A2MP_CHANGE_RSP: |
| 655 | case A2MP_CREATEPHYSLINK_RSP: |
| 656 | case A2MP_DISCONNPHYSLINK_RSP: |
| 657 | err = a2mp_cmd_rsp(mgr, skb, hdr); |
| 658 | break; |
| 659 | |
| 660 | default: |
| 661 | BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code); |
| 662 | err = -EINVAL; |
| 663 | break; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | if (err) { |
| 668 | struct a2mp_cmd_rej rej; |
| 669 | |
| 670 | rej.reason = cpu_to_le16(0); |
| 671 | hdr = (void *) skb->data; |
| 672 | |
| 673 | BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err); |
| 674 | |
| 675 | a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej), |
| 676 | &rej); |
| 677 | } |
| 678 | |
| 679 | /* Always free skb and return success error code to prevent |
| 680 | from sending L2CAP Disconnect over A2MP channel */ |
| 681 | kfree_skb(skb); |
| 682 | |
| 683 | amp_mgr_put(mgr); |
| 684 | |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | static void a2mp_chan_close_cb(struct l2cap_chan *chan) |
| 689 | { |
| 690 | l2cap_chan_put(chan); |
| 691 | } |
| 692 | |
| 693 | static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state, |
| 694 | int err) |
| 695 | { |
| 696 | struct amp_mgr *mgr = chan->data; |
| 697 | |
| 698 | if (!mgr) |
| 699 | return; |
| 700 | |
| 701 | BT_DBG("chan %p state %s", chan, state_to_string(state)); |
| 702 | |
| 703 | chan->state = state; |
| 704 | |
| 705 | switch (state) { |
| 706 | case BT_CLOSED: |
| 707 | if (mgr) |
| 708 | amp_mgr_put(mgr); |
| 709 | break; |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan, |
| 714 | unsigned long hdr_len, |
| 715 | unsigned long len, int nb) |
| 716 | { |
| 717 | struct sk_buff *skb; |
| 718 | |
| 719 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); |
| 720 | if (!skb) |
| 721 | return ERR_PTR(-ENOMEM); |
| 722 | |
| 723 | return skb; |
| 724 | } |
| 725 | |
| 726 | static const struct l2cap_ops a2mp_chan_ops = { |
| 727 | .name = "L2CAP A2MP channel", |
| 728 | .recv = a2mp_chan_recv_cb, |
| 729 | .close = a2mp_chan_close_cb, |
| 730 | .state_change = a2mp_chan_state_change_cb, |
| 731 | .alloc_skb = a2mp_chan_alloc_skb_cb, |
| 732 | |
| 733 | /* Not implemented for A2MP */ |
| 734 | .new_connection = l2cap_chan_no_new_connection, |
| 735 | .teardown = l2cap_chan_no_teardown, |
| 736 | .ready = l2cap_chan_no_ready, |
| 737 | .defer = l2cap_chan_no_defer, |
| 738 | .resume = l2cap_chan_no_resume, |
| 739 | .set_shutdown = l2cap_chan_no_set_shutdown, |
| 740 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, |
| 741 | }; |
| 742 | |
| 743 | static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked) |
| 744 | { |
| 745 | struct l2cap_chan *chan; |
| 746 | int err; |
| 747 | |
| 748 | chan = l2cap_chan_create(); |
| 749 | if (!chan) |
| 750 | return NULL; |
| 751 | |
| 752 | BT_DBG("chan %p", chan); |
| 753 | |
| 754 | chan->chan_type = L2CAP_CHAN_FIXED; |
| 755 | chan->scid = L2CAP_CID_A2MP; |
| 756 | chan->dcid = L2CAP_CID_A2MP; |
| 757 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; |
| 758 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; |
| 759 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
| 760 | |
| 761 | chan->ops = &a2mp_chan_ops; |
| 762 | |
| 763 | l2cap_chan_set_defaults(chan); |
| 764 | chan->remote_max_tx = chan->max_tx; |
| 765 | chan->remote_tx_win = chan->tx_win; |
| 766 | |
| 767 | chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; |
| 768 | chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; |
| 769 | |
| 770 | skb_queue_head_init(&chan->tx_q); |
| 771 | |
| 772 | chan->mode = L2CAP_MODE_ERTM; |
| 773 | |
| 774 | err = l2cap_ertm_init(chan); |
| 775 | if (err < 0) { |
| 776 | l2cap_chan_del(chan, 0); |
| 777 | return NULL; |
| 778 | } |
| 779 | |
| 780 | chan->conf_state = 0; |
| 781 | |
| 782 | if (locked) |
| 783 | __l2cap_chan_add(conn, chan); |
| 784 | else |
| 785 | l2cap_chan_add(conn, chan); |
| 786 | |
| 787 | chan->remote_mps = chan->omtu; |
| 788 | chan->mps = chan->omtu; |
| 789 | |
| 790 | chan->state = BT_CONNECTED; |
| 791 | |
| 792 | return chan; |
| 793 | } |
| 794 | |
| 795 | /* AMP Manager functions */ |
| 796 | struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr) |
| 797 | { |
| 798 | BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount)); |
| 799 | |
| 800 | kref_get(&mgr->kref); |
| 801 | |
| 802 | return mgr; |
| 803 | } |
| 804 | |
| 805 | static void amp_mgr_destroy(struct kref *kref) |
| 806 | { |
| 807 | struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref); |
| 808 | |
| 809 | BT_DBG("mgr %p", mgr); |
| 810 | |
| 811 | mutex_lock(&_mgr_list_lock); |
| 812 | list_del(&mgr->list); |
| 813 | mutex_unlock(&_mgr_list_lock); |
| 814 | |
| 815 | amp_ctrl_list_flush(mgr); |
| 816 | kfree(mgr); |
| 817 | } |
| 818 | |
| 819 | int amp_mgr_put(struct amp_mgr *mgr) |
| 820 | { |
| 821 | BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount)); |
| 822 | |
| 823 | return kref_put(&mgr->kref, &_mgr_destroy); |
| 824 | } |
| 825 | |
| 826 | static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked) |
| 827 | { |
| 828 | struct amp_mgr *mgr; |
| 829 | struct l2cap_chan *chan; |
| 830 | |
| 831 | mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); |
| 832 | if (!mgr) |
| 833 | return NULL; |
| 834 | |
| 835 | BT_DBG("conn %p mgr %p", conn, mgr); |
| 836 | |
| 837 | mgr->l2cap_conn = conn; |
| 838 | |
| 839 | chan = a2mp_chan_open(conn, locked); |
| 840 | if (!chan) { |
| 841 | kfree(mgr); |
| 842 | return NULL; |
| 843 | } |
| 844 | |
| 845 | mgr->a2mp_chan = chan; |
| 846 | chan->data = mgr; |
| 847 | |
| 848 | conn->hcon->amp_mgr = mgr; |
| 849 | |
| 850 | kref_init(&mgr->kref); |
| 851 | |
| 852 | /* Remote AMP ctrl list initialization */ |
| 853 | INIT_LIST_HEAD(&mgr->amp_ctrls); |
| 854 | mutex_init(&mgr->amp_ctrls_lock); |
| 855 | |
| 856 | mutex_lock(&_mgr_list_lock); |
| 857 | list_add(&mgr->list, &_mgr_list); |
| 858 | mutex_unlock(&_mgr_list_lock); |
| 859 | |
| 860 | return mgr; |
| 861 | } |
| 862 | |
| 863 | struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn, |
| 864 | struct sk_buff *skb) |
| 865 | { |
| 866 | struct amp_mgr *mgr; |
| 867 | |
| 868 | if (conn->hcon->type != ACL_LINK) |
| 869 | return NULL; |
| 870 | |
| 871 | mgr = amp_mgr_create(conn, false); |
| 872 | if (!mgr) { |
| 873 | BT_ERR("Could not create AMP manager"); |
| 874 | return NULL; |
| 875 | } |
| 876 | |
| 877 | BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan); |
| 878 | |
| 879 | return mgr->a2mp_chan; |
| 880 | } |
| 881 | |
| 882 | void a2mp_send_getinfo_rsp(struct hci_dev *hdev) |
| 883 | { |
| 884 | struct amp_mgr *mgr; |
| 885 | struct a2mp_info_rsp rsp; |
| 886 | |
| 887 | mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO); |
| 888 | if (!mgr) |
| 889 | return; |
| 890 | |
| 891 | BT_DBG("%s mgr %p", hdev->name, mgr); |
| 892 | |
| 893 | rsp.id = hdev->id; |
| 894 | rsp.status = A2MP_STATUS_INVALID_CTRL_ID; |
| 895 | |
| 896 | if (hdev->amp_type != AMP_TYPE_BREDR) { |
| 897 | rsp.status = 0; |
| 898 | rsp.total_bw = cpu_to_le32(hdev->amp_total_bw); |
| 899 | rsp.max_bw = cpu_to_le32(hdev->amp_max_bw); |
| 900 | rsp.min_latency = cpu_to_le32(hdev->amp_min_latency); |
| 901 | rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap); |
| 902 | rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size); |
| 903 | } |
| 904 | |
| 905 | a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp); |
| 906 | amp_mgr_put(mgr); |
| 907 | } |
| 908 | |
| 909 | void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status) |
| 910 | { |
| 911 | struct amp_mgr *mgr; |
| 912 | struct amp_assoc *loc_assoc = &hdev->loc_assoc; |
| 913 | struct a2mp_amp_assoc_rsp *rsp; |
| 914 | size_t len; |
| 915 | |
| 916 | mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC); |
| 917 | if (!mgr) |
| 918 | return; |
| 919 | |
| 920 | BT_DBG("%s mgr %p", hdev->name, mgr); |
| 921 | |
| 922 | len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len; |
| 923 | rsp = kzalloc(len, GFP_KERNEL); |
| 924 | if (!rsp) { |
| 925 | amp_mgr_put(mgr); |
| 926 | return; |
| 927 | } |
| 928 | |
| 929 | rsp->id = hdev->id; |
| 930 | |
| 931 | if (status) { |
| 932 | rsp->status = A2MP_STATUS_INVALID_CTRL_ID; |
| 933 | } else { |
| 934 | rsp->status = A2MP_STATUS_SUCCESS; |
| 935 | memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len); |
| 936 | } |
| 937 | |
| 938 | a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp); |
| 939 | amp_mgr_put(mgr); |
| 940 | kfree(rsp); |
| 941 | } |
| 942 | |
| 943 | void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status) |
| 944 | { |
| 945 | struct amp_mgr *mgr; |
| 946 | struct amp_assoc *loc_assoc = &hdev->loc_assoc; |
| 947 | struct a2mp_physlink_req *req; |
| 948 | struct l2cap_chan *bredr_chan; |
| 949 | size_t len; |
| 950 | |
| 951 | mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL); |
| 952 | if (!mgr) |
| 953 | return; |
| 954 | |
| 955 | len = sizeof(*req) + loc_assoc->len; |
| 956 | |
| 957 | BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len); |
| 958 | |
| 959 | req = kzalloc(len, GFP_KERNEL); |
| 960 | if (!req) { |
| 961 | amp_mgr_put(mgr); |
| 962 | return; |
| 963 | } |
| 964 | |
| 965 | bredr_chan = mgr->bredr_chan; |
| 966 | if (!bredr_chan) |
| 967 | goto clean; |
| 968 | |
| 969 | req->local_id = hdev->id; |
| 970 | req->remote_id = bredr_chan->remote_amp_id; |
| 971 | memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len); |
| 972 | |
| 973 | a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req); |
| 974 | |
| 975 | clean: |
| 976 | amp_mgr_put(mgr); |
| 977 | kfree(req); |
| 978 | } |
| 979 | |
| 980 | void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status) |
| 981 | { |
| 982 | struct amp_mgr *mgr; |
| 983 | struct a2mp_physlink_rsp rsp; |
| 984 | struct hci_conn *hs_hcon; |
| 985 | |
| 986 | mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC); |
| 987 | if (!mgr) |
| 988 | return; |
| 989 | |
| 990 | hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT); |
| 991 | if (!hs_hcon) { |
| 992 | rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION; |
| 993 | } else { |
| 994 | rsp.remote_id = hs_hcon->remote_id; |
| 995 | rsp.status = A2MP_STATUS_SUCCESS; |
| 996 | } |
| 997 | |
| 998 | BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon, |
| 999 | status); |
| 1000 | |
| 1001 | rsp.local_id = hdev->id; |
| 1002 | a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp); |
| 1003 | amp_mgr_put(mgr); |
| 1004 | } |
| 1005 | |
| 1006 | void a2mp_discover_amp(struct l2cap_chan *chan) |
| 1007 | { |
| 1008 | struct l2cap_conn *conn = chan->conn; |
| 1009 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
| 1010 | struct a2mp_discov_req req; |
| 1011 | |
| 1012 | BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr); |
| 1013 | |
| 1014 | if (!mgr) { |
| 1015 | mgr = amp_mgr_create(conn, true); |
| 1016 | if (!mgr) |
| 1017 | return; |
| 1018 | } |
| 1019 | |
| 1020 | mgr->bredr_chan = chan; |
| 1021 | |
| 1022 | req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU); |
| 1023 | req.ext_feat = 0; |
| 1024 | a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req); |
| 1025 | } |