| 1 | /* $NetBSD: l2cap_signal.c,v 1.18 2016/10/04 14:13:46 joerg Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2005 Iain Hibbert. |
| 5 | * Copyright (c) 2006 Itronix Inc. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. The name of Itronix Inc. may not be used to endorse |
| 17 | * or promote products derived from this software without specific |
| 18 | * prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY |
| 24 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 25 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 26 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 27 | * ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 30 | * POSSIBILITY OF SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <sys/cdefs.h> |
| 34 | __KERNEL_RCSID(0, "$NetBSD: l2cap_signal.c,v 1.18 2016/10/04 14:13:46 joerg Exp $" ); |
| 35 | |
| 36 | #include <sys/param.h> |
| 37 | #include <sys/kernel.h> |
| 38 | #include <sys/mbuf.h> |
| 39 | #include <sys/proc.h> |
| 40 | #include <sys/queue.h> |
| 41 | #include <sys/systm.h> |
| 42 | |
| 43 | #include <netbt/bluetooth.h> |
| 44 | #include <netbt/hci.h> |
| 45 | #include <netbt/l2cap.h> |
| 46 | |
| 47 | /******************************************************************************* |
| 48 | * |
| 49 | * L2CAP Signal processing |
| 50 | */ |
| 51 | |
| 52 | static void l2cap_recv_command_rej(struct mbuf *, struct hci_link *); |
| 53 | static void l2cap_recv_connect_req(struct mbuf *, struct hci_link *); |
| 54 | static void l2cap_recv_connect_rsp(struct mbuf *, struct hci_link *); |
| 55 | static void l2cap_recv_config_req(struct mbuf *, struct hci_link *); |
| 56 | static void l2cap_recv_config_rsp(struct mbuf *, struct hci_link *); |
| 57 | static void l2cap_recv_disconnect_req(struct mbuf *, struct hci_link *); |
| 58 | static void l2cap_recv_disconnect_rsp(struct mbuf *, struct hci_link *); |
| 59 | static void l2cap_recv_info_req(struct mbuf *, struct hci_link *); |
| 60 | static int l2cap_send_signal(struct hci_link *, uint8_t, uint8_t, uint16_t, void *); |
| 61 | static int l2cap_send_command_rej(struct hci_link *, uint8_t, int, ...); |
| 62 | static void l2cap_qos_btoh(l2cap_qos_t *, void *); |
| 63 | static void l2cap_qos_htob(void *, l2cap_qos_t *); |
| 64 | |
| 65 | /* |
| 66 | * process incoming signal packets (CID 0x0001). Can contain multiple |
| 67 | * requests/responses. |
| 68 | */ |
| 69 | void |
| 70 | l2cap_recv_signal(struct mbuf *m, struct hci_link *link) |
| 71 | { |
| 72 | l2cap_cmd_hdr_t cmd; |
| 73 | |
| 74 | for(;;) { |
| 75 | if (m->m_pkthdr.len == 0) |
| 76 | goto finish; |
| 77 | |
| 78 | if (m->m_pkthdr.len < sizeof(cmd)) |
| 79 | goto reject; |
| 80 | |
| 81 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 82 | cmd.length = le16toh(cmd.length); |
| 83 | |
| 84 | if (m->m_pkthdr.len < sizeof(cmd) + cmd.length) |
| 85 | goto reject; |
| 86 | |
| 87 | DPRINTFN(2, "(%s) code %d, ident %d, len %d\n" , |
| 88 | device_xname(link->hl_unit->hci_dev), |
| 89 | cmd.code, cmd.ident, cmd.length); |
| 90 | |
| 91 | switch (cmd.code) { |
| 92 | case L2CAP_COMMAND_REJ: |
| 93 | if (cmd.length > sizeof(l2cap_cmd_rej_cp)) |
| 94 | goto finish; |
| 95 | |
| 96 | l2cap_recv_command_rej(m, link); |
| 97 | break; |
| 98 | |
| 99 | case L2CAP_CONNECT_REQ: |
| 100 | if (cmd.length != sizeof(l2cap_con_req_cp)) |
| 101 | goto reject; |
| 102 | |
| 103 | l2cap_recv_connect_req(m, link); |
| 104 | break; |
| 105 | |
| 106 | case L2CAP_CONNECT_RSP: |
| 107 | if (cmd.length != sizeof(l2cap_con_rsp_cp)) |
| 108 | goto finish; |
| 109 | |
| 110 | l2cap_recv_connect_rsp(m, link); |
| 111 | break; |
| 112 | |
| 113 | case L2CAP_CONFIG_REQ: |
| 114 | l2cap_recv_config_req(m, link); |
| 115 | break; |
| 116 | |
| 117 | case L2CAP_CONFIG_RSP: |
| 118 | l2cap_recv_config_rsp(m, link); |
| 119 | break; |
| 120 | |
| 121 | case L2CAP_DISCONNECT_REQ: |
| 122 | if (cmd.length != sizeof(l2cap_discon_req_cp)) |
| 123 | goto reject; |
| 124 | |
| 125 | l2cap_recv_disconnect_req(m, link); |
| 126 | break; |
| 127 | |
| 128 | case L2CAP_DISCONNECT_RSP: |
| 129 | if (cmd.length != sizeof(l2cap_discon_rsp_cp)) |
| 130 | goto finish; |
| 131 | |
| 132 | l2cap_recv_disconnect_rsp(m, link); |
| 133 | break; |
| 134 | |
| 135 | case L2CAP_ECHO_REQ: |
| 136 | m_adj(m, sizeof(cmd) + cmd.length); |
| 137 | l2cap_send_signal(link, L2CAP_ECHO_RSP, cmd.ident, |
| 138 | 0, NULL); |
| 139 | break; |
| 140 | |
| 141 | case L2CAP_ECHO_RSP: |
| 142 | m_adj(m, sizeof(cmd) + cmd.length); |
| 143 | break; |
| 144 | |
| 145 | case L2CAP_INFO_REQ: |
| 146 | if (cmd.length != sizeof(l2cap_info_req_cp)) |
| 147 | goto reject; |
| 148 | |
| 149 | l2cap_recv_info_req(m, link); |
| 150 | break; |
| 151 | |
| 152 | case L2CAP_INFO_RSP: |
| 153 | m_adj(m, sizeof(cmd) + cmd.length); |
| 154 | break; |
| 155 | |
| 156 | default: |
| 157 | goto reject; |
| 158 | } |
| 159 | } |
| 160 | panic("impossible!" ); |
| 161 | |
| 162 | reject: |
| 163 | l2cap_send_command_rej(link, cmd.ident, L2CAP_REJ_NOT_UNDERSTOOD); |
| 164 | finish: |
| 165 | m_freem(m); |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Process Received Command Reject. For now we dont try to recover gracefully |
| 170 | * from this, it probably means that the link is garbled or the other end is |
| 171 | * insufficiently capable of handling normal traffic. (not *my* fault, no way!) |
| 172 | */ |
| 173 | static void |
| 174 | l2cap_recv_command_rej(struct mbuf *m, struct hci_link *link) |
| 175 | { |
| 176 | struct l2cap_req *req; |
| 177 | struct l2cap_channel *chan; |
| 178 | l2cap_cmd_hdr_t cmd; |
| 179 | l2cap_cmd_rej_cp cp; |
| 180 | |
| 181 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 182 | m_adj(m, sizeof(cmd)); |
| 183 | |
| 184 | cmd.length = le16toh(cmd.length); |
| 185 | |
| 186 | m_copydata(m, 0, cmd.length, &cp); |
| 187 | m_adj(m, cmd.length); |
| 188 | |
| 189 | req = l2cap_request_lookup(link, cmd.ident); |
| 190 | if (req == NULL) |
| 191 | return; |
| 192 | |
| 193 | switch (le16toh(cp.reason)) { |
| 194 | case L2CAP_REJ_NOT_UNDERSTOOD: |
| 195 | /* |
| 196 | * I dont know what to do, just move up the timeout |
| 197 | */ |
| 198 | callout_schedule(&req->lr_rtx, 0); |
| 199 | break; |
| 200 | |
| 201 | case L2CAP_REJ_MTU_EXCEEDED: |
| 202 | /* |
| 203 | * I didnt send any commands over L2CAP_MTU_MINIMUM size, but.. |
| 204 | * |
| 205 | * XXX maybe we should resend this, instead? |
| 206 | */ |
| 207 | link->hl_mtu = le16toh(cp.data[0]); |
| 208 | callout_schedule(&req->lr_rtx, 0); |
| 209 | break; |
| 210 | |
| 211 | case L2CAP_REJ_INVALID_CID: |
| 212 | /* |
| 213 | * Well, if they dont have such a channel then our channel is |
| 214 | * most likely closed. Make it so. |
| 215 | */ |
| 216 | chan = req->lr_chan; |
| 217 | l2cap_request_free(req); |
| 218 | if (chan != NULL && chan->lc_state != L2CAP_CLOSED) |
| 219 | l2cap_close(chan, ECONNABORTED); |
| 220 | |
| 221 | break; |
| 222 | |
| 223 | default: |
| 224 | UNKNOWN(le16toh(cp.reason)); |
| 225 | break; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * Process Received Connect Request. Find listening channel matching |
| 231 | * psm & addr and ask upper layer for a new channel. |
| 232 | */ |
| 233 | static void |
| 234 | l2cap_recv_connect_req(struct mbuf *m, struct hci_link *link) |
| 235 | { |
| 236 | struct sockaddr_bt laddr, raddr; |
| 237 | struct l2cap_channel *chan, *new; |
| 238 | l2cap_cmd_hdr_t cmd; |
| 239 | l2cap_con_req_cp cp; |
| 240 | int err; |
| 241 | |
| 242 | /* extract cmd */ |
| 243 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 244 | m_adj(m, sizeof(cmd)); |
| 245 | |
| 246 | /* extract request */ |
| 247 | m_copydata(m, 0, sizeof(cp), &cp); |
| 248 | m_adj(m, sizeof(cp)); |
| 249 | |
| 250 | cp.scid = le16toh(cp.scid); |
| 251 | cp.psm = le16toh(cp.psm); |
| 252 | |
| 253 | memset(&laddr, 0, sizeof(struct sockaddr_bt)); |
| 254 | laddr.bt_len = sizeof(struct sockaddr_bt); |
| 255 | laddr.bt_family = AF_BLUETOOTH; |
| 256 | laddr.bt_psm = cp.psm; |
| 257 | bdaddr_copy(&laddr.bt_bdaddr, &link->hl_unit->hci_bdaddr); |
| 258 | |
| 259 | memset(&raddr, 0, sizeof(struct sockaddr_bt)); |
| 260 | raddr.bt_len = sizeof(struct sockaddr_bt); |
| 261 | raddr.bt_family = AF_BLUETOOTH; |
| 262 | raddr.bt_psm = cp.psm; |
| 263 | bdaddr_copy(&raddr.bt_bdaddr, &link->hl_bdaddr); |
| 264 | |
| 265 | LIST_FOREACH(chan, &l2cap_listen_list, lc_ncid) { |
| 266 | if (chan->lc_laddr.bt_psm != laddr.bt_psm) |
| 267 | continue; |
| 268 | |
| 269 | if (!bdaddr_same(&laddr.bt_bdaddr, &chan->lc_laddr.bt_bdaddr) |
| 270 | && bdaddr_any(&chan->lc_laddr.bt_bdaddr) == 0) |
| 271 | continue; |
| 272 | |
| 273 | new= (*chan->lc_proto->newconn)(chan->lc_upper, &laddr, &raddr); |
| 274 | if (new == NULL) |
| 275 | continue; |
| 276 | |
| 277 | err = l2cap_cid_alloc(new); |
| 278 | if (err) { |
| 279 | l2cap_send_connect_rsp(link, cmd.ident, |
| 280 | 0, cp.scid, |
| 281 | L2CAP_NO_RESOURCES); |
| 282 | |
| 283 | (*new->lc_proto->disconnected)(new->lc_upper, err); |
| 284 | return; |
| 285 | } |
| 286 | |
| 287 | new->lc_link = hci_acl_open(link->hl_unit, &link->hl_bdaddr); |
| 288 | KASSERT(new->lc_link == link); |
| 289 | |
| 290 | new->lc_rcid = cp.scid; |
| 291 | new->lc_ident = cmd.ident; |
| 292 | |
| 293 | memcpy(&new->lc_laddr, &laddr, sizeof(struct sockaddr_bt)); |
| 294 | memcpy(&new->lc_raddr, &raddr, sizeof(struct sockaddr_bt)); |
| 295 | |
| 296 | new->lc_mode = chan->lc_mode; |
| 297 | |
| 298 | err = l2cap_setmode(new); |
| 299 | if (err == EINPROGRESS) { |
| 300 | new->lc_state = L2CAP_WAIT_SEND_CONNECT_RSP; |
| 301 | (*new->lc_proto->connecting)(new->lc_upper); |
| 302 | return; |
| 303 | } |
| 304 | if (err) { |
| 305 | new->lc_state = L2CAP_CLOSED; |
| 306 | hci_acl_close(link, err); |
| 307 | new->lc_link = NULL; |
| 308 | |
| 309 | l2cap_send_connect_rsp(link, cmd.ident, |
| 310 | 0, cp.scid, |
| 311 | L2CAP_NO_RESOURCES); |
| 312 | |
| 313 | (*new->lc_proto->disconnected)(new->lc_upper, err); |
| 314 | return; |
| 315 | } |
| 316 | |
| 317 | err = l2cap_send_connect_rsp(link, cmd.ident, |
| 318 | new->lc_lcid, new->lc_rcid, |
| 319 | L2CAP_SUCCESS); |
| 320 | if (err) { |
| 321 | l2cap_close(new, err); |
| 322 | return; |
| 323 | } |
| 324 | |
| 325 | new->lc_state = L2CAP_WAIT_CONFIG; |
| 326 | new->lc_flags |= (L2CAP_WAIT_CONFIG_REQ | L2CAP_WAIT_CONFIG_RSP); |
| 327 | err = l2cap_send_config_req(new); |
| 328 | if (err) |
| 329 | l2cap_close(new, err); |
| 330 | |
| 331 | return; |
| 332 | } |
| 333 | |
| 334 | l2cap_send_connect_rsp(link, cmd.ident, |
| 335 | 0, cp.scid, |
| 336 | L2CAP_PSM_NOT_SUPPORTED); |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * Process Received Connect Response. |
| 341 | */ |
| 342 | static void |
| 343 | l2cap_recv_connect_rsp(struct mbuf *m, struct hci_link *link) |
| 344 | { |
| 345 | l2cap_cmd_hdr_t cmd; |
| 346 | l2cap_con_rsp_cp cp; |
| 347 | struct l2cap_req *req; |
| 348 | struct l2cap_channel *chan; |
| 349 | |
| 350 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 351 | m_adj(m, sizeof(cmd)); |
| 352 | |
| 353 | m_copydata(m, 0, sizeof(cp), &cp); |
| 354 | m_adj(m, sizeof(cp)); |
| 355 | |
| 356 | cp.scid = le16toh(cp.scid); |
| 357 | cp.dcid = le16toh(cp.dcid); |
| 358 | cp.result = le16toh(cp.result); |
| 359 | |
| 360 | req = l2cap_request_lookup(link, cmd.ident); |
| 361 | if (req == NULL || req->lr_code != L2CAP_CONNECT_REQ) |
| 362 | return; |
| 363 | |
| 364 | chan = req->lr_chan; |
| 365 | if (chan != NULL && chan->lc_lcid != cp.scid) |
| 366 | return; |
| 367 | |
| 368 | if (chan == NULL || chan->lc_state != L2CAP_WAIT_RECV_CONNECT_RSP) { |
| 369 | l2cap_request_free(req); |
| 370 | return; |
| 371 | } |
| 372 | |
| 373 | switch (cp.result) { |
| 374 | case L2CAP_SUCCESS: |
| 375 | /* |
| 376 | * Ok, at this point we have a connection to the other party. We |
| 377 | * could indicate upstream that we are ready for business and |
| 378 | * wait for a "Configure Channel Request" but I'm not so sure |
| 379 | * that is required in our case - we will proceed directly to |
| 380 | * sending our config request. We set two state bits because in |
| 381 | * the config state we are waiting for requests and responses. |
| 382 | */ |
| 383 | l2cap_request_free(req); |
| 384 | chan->lc_rcid = cp.dcid; |
| 385 | chan->lc_state = L2CAP_WAIT_CONFIG; |
| 386 | chan->lc_flags |= (L2CAP_WAIT_CONFIG_REQ | L2CAP_WAIT_CONFIG_RSP); |
| 387 | l2cap_send_config_req(chan); |
| 388 | break; |
| 389 | |
| 390 | case L2CAP_PENDING: |
| 391 | /* XXX dont release request, should start eRTX timeout? */ |
| 392 | (*chan->lc_proto->connecting)(chan->lc_upper); |
| 393 | break; |
| 394 | |
| 395 | case L2CAP_PSM_NOT_SUPPORTED: |
| 396 | case L2CAP_SECURITY_BLOCK: |
| 397 | case L2CAP_NO_RESOURCES: |
| 398 | default: |
| 399 | l2cap_request_free(req); |
| 400 | l2cap_close(chan, ECONNREFUSED); |
| 401 | break; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * Process Received Config Reqest. |
| 407 | */ |
| 408 | static void |
| 409 | l2cap_recv_config_req(struct mbuf *m, struct hci_link *link) |
| 410 | { |
| 411 | uint8_t buf[L2CAP_MTU_MINIMUM]; |
| 412 | l2cap_cmd_hdr_t cmd; |
| 413 | l2cap_cfg_req_cp cp; |
| 414 | l2cap_cfg_opt_t opt; |
| 415 | l2cap_cfg_opt_val_t val; |
| 416 | l2cap_cfg_rsp_cp rp; |
| 417 | struct l2cap_channel *chan; |
| 418 | int left, len; |
| 419 | |
| 420 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 421 | m_adj(m, sizeof(cmd)); |
| 422 | left = le16toh(cmd.length); |
| 423 | |
| 424 | if (left < sizeof(cp)) |
| 425 | goto reject; |
| 426 | |
| 427 | m_copydata(m, 0, sizeof(cp), &cp); |
| 428 | m_adj(m, sizeof(cp)); |
| 429 | left -= sizeof(cp); |
| 430 | |
| 431 | cp.dcid = le16toh(cp.dcid); |
| 432 | cp.flags = le16toh(cp.flags); |
| 433 | |
| 434 | chan = l2cap_cid_lookup(cp.dcid); |
| 435 | if (chan == NULL || chan->lc_link != link |
| 436 | || chan->lc_state != L2CAP_WAIT_CONFIG |
| 437 | || (chan->lc_flags & L2CAP_WAIT_CONFIG_REQ) == 0) { |
| 438 | /* XXX we should really accept reconfiguration requests */ |
| 439 | l2cap_send_command_rej(link, cmd.ident, L2CAP_REJ_INVALID_CID, |
| 440 | L2CAP_NULL_CID, cp.dcid); |
| 441 | goto out; |
| 442 | } |
| 443 | |
| 444 | /* ready our response packet */ |
| 445 | rp.scid = htole16(chan->lc_rcid); |
| 446 | rp.flags = 0; /* "No Continuation" */ |
| 447 | rp.result = L2CAP_SUCCESS; |
| 448 | len = sizeof(rp); |
| 449 | |
| 450 | /* |
| 451 | * Process the packet. We build the return packet on the fly adding any |
| 452 | * unacceptable parameters as we go. As we can only return one result, |
| 453 | * unknown option takes precedence so we start our return packet anew |
| 454 | * and ignore option values thereafter as they will be re-sent. |
| 455 | * |
| 456 | * Since we do not support enough options to make overflowing the min |
| 457 | * MTU size an issue in normal use, we just reject config requests that |
| 458 | * make that happen. This could be because options are repeated or the |
| 459 | * packet is corrupted in some way. |
| 460 | * |
| 461 | * If unknown option types threaten to overflow the packet, we just |
| 462 | * ignore them. We can deny them next time. |
| 463 | */ |
| 464 | while (left > 0) { |
| 465 | if (left < sizeof(opt)) |
| 466 | goto reject; |
| 467 | |
| 468 | m_copydata(m, 0, sizeof(opt), &opt); |
| 469 | m_adj(m, sizeof(opt)); |
| 470 | left -= sizeof(opt); |
| 471 | |
| 472 | if (left < opt.length) |
| 473 | goto reject; |
| 474 | |
| 475 | switch(opt.type & L2CAP_OPT_HINT_MASK) { |
| 476 | case L2CAP_OPT_MTU: |
| 477 | if (rp.result == L2CAP_UNKNOWN_OPTION) |
| 478 | break; |
| 479 | |
| 480 | if (opt.length != L2CAP_OPT_MTU_SIZE) |
| 481 | goto reject; |
| 482 | |
| 483 | m_copydata(m, 0, L2CAP_OPT_MTU_SIZE, &val); |
| 484 | val.mtu = le16toh(val.mtu); |
| 485 | |
| 486 | /* |
| 487 | * XXX how do we know what the minimum acceptable MTU is |
| 488 | * for a channel? Spec says some profiles have a higher |
| 489 | * minimum but I have no way to find that out at this |
| 490 | * juncture.. |
| 491 | */ |
| 492 | if (val.mtu < L2CAP_MTU_MINIMUM) { |
| 493 | if (len + sizeof(opt) + L2CAP_OPT_MTU_SIZE > sizeof(buf)) |
| 494 | goto reject; |
| 495 | |
| 496 | rp.result = L2CAP_UNACCEPTABLE_PARAMS; |
| 497 | memcpy(buf + len, &opt, sizeof(opt)); |
| 498 | len += sizeof(opt); |
| 499 | val.mtu = htole16(L2CAP_MTU_MINIMUM); |
| 500 | memcpy(buf + len, &val, L2CAP_OPT_MTU_SIZE); |
| 501 | len += L2CAP_OPT_MTU_SIZE; |
| 502 | } else |
| 503 | chan->lc_omtu = val.mtu; |
| 504 | |
| 505 | break; |
| 506 | |
| 507 | case L2CAP_OPT_FLUSH_TIMO: |
| 508 | if (rp.result == L2CAP_UNKNOWN_OPTION) |
| 509 | break; |
| 510 | |
| 511 | if (opt.length != L2CAP_OPT_FLUSH_TIMO_SIZE) |
| 512 | goto reject; |
| 513 | |
| 514 | /* |
| 515 | * I think that this is informational only - he is |
| 516 | * informing us of the flush timeout he will be using. |
| 517 | * I dont think this affects us in any significant way, |
| 518 | * so just ignore this value for now. |
| 519 | */ |
| 520 | break; |
| 521 | |
| 522 | case L2CAP_OPT_QOS: |
| 523 | if (rp.result == L2CAP_UNKNOWN_OPTION) |
| 524 | break; |
| 525 | |
| 526 | if (opt.length != L2CAP_OPT_QOS_SIZE) |
| 527 | goto reject; |
| 528 | |
| 529 | /* |
| 530 | * We don't actually support QoS, but an incoming |
| 531 | * config request is merely advising us of their |
| 532 | * outgoing traffic flow, so be nice. |
| 533 | */ |
| 534 | m_copydata(m, 0, L2CAP_OPT_QOS_SIZE, &val); |
| 535 | switch (val.qos.service_type) { |
| 536 | case L2CAP_QOS_NO_TRAFFIC: |
| 537 | /* |
| 538 | * "No traffic" means they don't plan to send |
| 539 | * any data and the fields should be ignored. |
| 540 | */ |
| 541 | chan->lc_iqos = l2cap_default_qos; |
| 542 | chan->lc_iqos.service_type = L2CAP_QOS_NO_TRAFFIC; |
| 543 | break; |
| 544 | |
| 545 | case L2CAP_QOS_BEST_EFFORT: |
| 546 | /* |
| 547 | * "Best effort" is the default, and we may |
| 548 | * choose to ignore the fields, try to satisfy |
| 549 | * the parameters while giving no response, or |
| 550 | * respond with the settings we will try to |
| 551 | * meet. |
| 552 | */ |
| 553 | l2cap_qos_btoh(&chan->lc_iqos, &val.qos); |
| 554 | break; |
| 555 | |
| 556 | case L2CAP_QOS_GUARANTEED: |
| 557 | default: |
| 558 | /* |
| 559 | * Anything else we don't support, so make a |
| 560 | * counter-offer with the current settings. |
| 561 | */ |
| 562 | if (len + sizeof(opt) + L2CAP_OPT_QOS_SIZE > sizeof(buf)) |
| 563 | goto reject; |
| 564 | |
| 565 | rp.result = L2CAP_UNACCEPTABLE_PARAMS; |
| 566 | memcpy(buf + len, &opt, sizeof(opt)); |
| 567 | len += sizeof(opt); |
| 568 | l2cap_qos_htob(buf + len, &chan->lc_iqos); |
| 569 | len += L2CAP_OPT_QOS_SIZE; |
| 570 | break; |
| 571 | } |
| 572 | break; |
| 573 | |
| 574 | default: |
| 575 | /* ignore hints */ |
| 576 | if (opt.type & L2CAP_OPT_HINT_BIT) |
| 577 | break; |
| 578 | |
| 579 | /* unknown options supercede all else */ |
| 580 | if (rp.result != L2CAP_UNKNOWN_OPTION) { |
| 581 | rp.result = L2CAP_UNKNOWN_OPTION; |
| 582 | len = sizeof(rp); |
| 583 | } |
| 584 | |
| 585 | /* ignore if it don't fit */ |
| 586 | if (len + sizeof(opt) > sizeof(buf)) |
| 587 | break; |
| 588 | |
| 589 | /* return unknown option type, but no data */ |
| 590 | buf[len++] = opt.type; |
| 591 | buf[len++] = 0; |
| 592 | break; |
| 593 | } |
| 594 | |
| 595 | m_adj(m, opt.length); |
| 596 | left -= opt.length; |
| 597 | } |
| 598 | |
| 599 | rp.result = htole16(rp.result); |
| 600 | memcpy(buf, &rp, sizeof(rp)); |
| 601 | l2cap_send_signal(link, L2CAP_CONFIG_RSP, cmd.ident, len, buf); |
| 602 | |
| 603 | if ((cp.flags & L2CAP_OPT_CFLAG_BIT) == 0 |
| 604 | && rp.result == le16toh(L2CAP_SUCCESS)) { |
| 605 | |
| 606 | chan->lc_flags &= ~L2CAP_WAIT_CONFIG_REQ; |
| 607 | |
| 608 | if ((chan->lc_flags & L2CAP_WAIT_CONFIG_RSP) == 0) { |
| 609 | chan->lc_state = L2CAP_OPEN; |
| 610 | /* XXX how to distinguish REconfiguration? */ |
| 611 | (*chan->lc_proto->connected)(chan->lc_upper); |
| 612 | } |
| 613 | } |
| 614 | return; |
| 615 | |
| 616 | reject: |
| 617 | l2cap_send_command_rej(link, cmd.ident, L2CAP_REJ_NOT_UNDERSTOOD); |
| 618 | out: |
| 619 | m_adj(m, left); |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * Process Received Config Response. |
| 624 | */ |
| 625 | static void |
| 626 | l2cap_recv_config_rsp(struct mbuf *m, struct hci_link *link) |
| 627 | { |
| 628 | l2cap_cmd_hdr_t cmd; |
| 629 | l2cap_cfg_rsp_cp cp; |
| 630 | l2cap_cfg_opt_t opt; |
| 631 | l2cap_cfg_opt_val_t val; |
| 632 | struct l2cap_req *req; |
| 633 | struct l2cap_channel *chan; |
| 634 | int left; |
| 635 | |
| 636 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 637 | m_adj(m, sizeof(cmd)); |
| 638 | left = le16toh(cmd.length); |
| 639 | |
| 640 | if (left < sizeof(cp)) |
| 641 | goto out; |
| 642 | |
| 643 | m_copydata(m, 0, sizeof(cp), &cp); |
| 644 | m_adj(m, sizeof(cp)); |
| 645 | left -= sizeof(cp); |
| 646 | |
| 647 | cp.scid = le16toh(cp.scid); |
| 648 | cp.flags = le16toh(cp.flags); |
| 649 | cp.result = le16toh(cp.result); |
| 650 | |
| 651 | req = l2cap_request_lookup(link, cmd.ident); |
| 652 | if (req == NULL || req->lr_code != L2CAP_CONFIG_REQ) |
| 653 | goto out; |
| 654 | |
| 655 | chan = req->lr_chan; |
| 656 | if (chan != NULL && chan->lc_lcid != cp.scid) |
| 657 | goto out; |
| 658 | |
| 659 | l2cap_request_free(req); |
| 660 | |
| 661 | if (chan == NULL || chan->lc_state != L2CAP_WAIT_CONFIG |
| 662 | || (chan->lc_flags & L2CAP_WAIT_CONFIG_RSP) == 0) |
| 663 | goto out; |
| 664 | |
| 665 | if ((cp.flags & L2CAP_OPT_CFLAG_BIT)) { |
| 666 | l2cap_cfg_req_cp rp; |
| 667 | |
| 668 | /* |
| 669 | * They have more to tell us and want another ID to |
| 670 | * use, so send an empty config request |
| 671 | */ |
| 672 | if (l2cap_request_alloc(chan, L2CAP_CONFIG_REQ)) |
| 673 | goto discon; |
| 674 | |
| 675 | rp.dcid = htole16(cp.scid); |
| 676 | rp.flags = 0; |
| 677 | |
| 678 | if (l2cap_send_signal(link, L2CAP_CONFIG_REQ, link->hl_lastid, |
| 679 | sizeof(rp), &rp)) |
| 680 | goto discon; |
| 681 | } |
| 682 | |
| 683 | switch(cp.result) { |
| 684 | case L2CAP_SUCCESS: |
| 685 | /* |
| 686 | * If continuation flag was not set, our config request was |
| 687 | * accepted. We may have to wait for their config request to |
| 688 | * complete, so check that but otherwise we are open |
| 689 | * |
| 690 | * There may be 'advisory' values in the packet but we just |
| 691 | * ignore those.. |
| 692 | */ |
| 693 | if ((cp.flags & L2CAP_OPT_CFLAG_BIT) == 0) { |
| 694 | chan->lc_flags &= ~L2CAP_WAIT_CONFIG_RSP; |
| 695 | |
| 696 | if ((chan->lc_flags & L2CAP_WAIT_CONFIG_REQ) == 0) { |
| 697 | chan->lc_state = L2CAP_OPEN; |
| 698 | /* XXX how to distinguish REconfiguration? */ |
| 699 | (*chan->lc_proto->connected)(chan->lc_upper); |
| 700 | } |
| 701 | } |
| 702 | goto out; |
| 703 | |
| 704 | case L2CAP_UNACCEPTABLE_PARAMS: |
| 705 | /* |
| 706 | * Packet contains unacceptable parameters with preferred values |
| 707 | */ |
| 708 | while (left > 0) { |
| 709 | if (left < sizeof(opt)) |
| 710 | goto discon; |
| 711 | |
| 712 | m_copydata(m, 0, sizeof(opt), &opt); |
| 713 | m_adj(m, sizeof(opt)); |
| 714 | left -= sizeof(opt); |
| 715 | |
| 716 | if (left < opt.length) |
| 717 | goto discon; |
| 718 | |
| 719 | switch (opt.type) { |
| 720 | case L2CAP_OPT_MTU: |
| 721 | if (opt.length != L2CAP_OPT_MTU_SIZE) |
| 722 | goto discon; |
| 723 | |
| 724 | m_copydata(m, 0, L2CAP_OPT_MTU_SIZE, &val); |
| 725 | chan->lc_imtu = le16toh(val.mtu); |
| 726 | if (chan->lc_imtu < L2CAP_MTU_MINIMUM) |
| 727 | chan->lc_imtu = L2CAP_MTU_DEFAULT; |
| 728 | break; |
| 729 | |
| 730 | case L2CAP_OPT_FLUSH_TIMO: |
| 731 | if (opt.length != L2CAP_OPT_FLUSH_TIMO_SIZE) |
| 732 | goto discon; |
| 733 | |
| 734 | /* |
| 735 | * Spec says: If we cannot honor proposed value, |
| 736 | * either disconnect or try again with original |
| 737 | * value. I can't really see why they want to |
| 738 | * interfere with OUR flush timeout in any case |
| 739 | * so we just punt for now. |
| 740 | */ |
| 741 | goto discon; |
| 742 | |
| 743 | case L2CAP_OPT_QOS: |
| 744 | if (opt.length != L2CAP_OPT_QOS_SIZE) |
| 745 | goto discon; |
| 746 | |
| 747 | /* |
| 748 | * This may happen even if we haven't sent a |
| 749 | * QoS request, where they need to state their |
| 750 | * preferred incoming traffic flow. |
| 751 | * We don't support anything, but copy in the |
| 752 | * parameters if no action is good enough. |
| 753 | */ |
| 754 | m_copydata(m, 0, L2CAP_OPT_QOS_SIZE, &val); |
| 755 | switch (val.qos.service_type) { |
| 756 | case L2CAP_QOS_NO_TRAFFIC: |
| 757 | case L2CAP_QOS_BEST_EFFORT: |
| 758 | l2cap_qos_btoh(&chan->lc_oqos, &val.qos); |
| 759 | break; |
| 760 | |
| 761 | case L2CAP_QOS_GUARANTEED: |
| 762 | default: |
| 763 | goto discon; |
| 764 | } |
| 765 | break; |
| 766 | |
| 767 | default: |
| 768 | UNKNOWN(opt.type); |
| 769 | goto discon; |
| 770 | } |
| 771 | |
| 772 | m_adj(m, opt.length); |
| 773 | left -= opt.length; |
| 774 | } |
| 775 | |
| 776 | if ((cp.flags & L2CAP_OPT_CFLAG_BIT) == 0) |
| 777 | l2cap_send_config_req(chan); /* no state change */ |
| 778 | |
| 779 | goto out; |
| 780 | |
| 781 | case L2CAP_REJECT: |
| 782 | goto discon; |
| 783 | |
| 784 | case L2CAP_UNKNOWN_OPTION: |
| 785 | /* |
| 786 | * Packet contains options not understood. Turn off unknown |
| 787 | * options by setting them to default values (means they will |
| 788 | * not be requested again). |
| 789 | * |
| 790 | * If our option was already off then fail (paranoia?) |
| 791 | * |
| 792 | * XXX Should we consider that options were set for a reason? |
| 793 | */ |
| 794 | while (left > 0) { |
| 795 | if (left < sizeof(opt)) |
| 796 | goto discon; |
| 797 | |
| 798 | m_copydata(m, 0, sizeof(opt), &opt); |
| 799 | m_adj(m, sizeof(opt)); |
| 800 | left -= sizeof(opt); |
| 801 | |
| 802 | if (left < opt.length) |
| 803 | goto discon; |
| 804 | |
| 805 | m_adj(m, opt.length); |
| 806 | left -= opt.length; |
| 807 | |
| 808 | switch(opt.type) { |
| 809 | case L2CAP_OPT_MTU: |
| 810 | if (chan->lc_imtu == L2CAP_MTU_DEFAULT) |
| 811 | goto discon; |
| 812 | |
| 813 | chan->lc_imtu = L2CAP_MTU_DEFAULT; |
| 814 | break; |
| 815 | |
| 816 | case L2CAP_OPT_FLUSH_TIMO: |
| 817 | if (chan->lc_flush == L2CAP_FLUSH_TIMO_DEFAULT) |
| 818 | goto discon; |
| 819 | |
| 820 | chan->lc_flush = L2CAP_FLUSH_TIMO_DEFAULT; |
| 821 | break; |
| 822 | |
| 823 | case L2CAP_OPT_QOS: |
| 824 | break; |
| 825 | |
| 826 | default: |
| 827 | UNKNOWN(opt.type); |
| 828 | goto discon; |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | if ((cp.flags & L2CAP_OPT_CFLAG_BIT) == 0) |
| 833 | l2cap_send_config_req(chan); /* no state change */ |
| 834 | |
| 835 | goto out; |
| 836 | |
| 837 | default: |
| 838 | UNKNOWN(cp.result); |
| 839 | goto discon; |
| 840 | } |
| 841 | |
| 842 | DPRINTF("how did I get here!?\n" ); |
| 843 | |
| 844 | discon: |
| 845 | l2cap_send_disconnect_req(chan); |
| 846 | l2cap_close(chan, ECONNABORTED); |
| 847 | |
| 848 | out: |
| 849 | m_adj(m, left); |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | * Process Received Disconnect Request. We must validate scid and dcid |
| 854 | * just in case but otherwise this connection is finished. |
| 855 | */ |
| 856 | static void |
| 857 | l2cap_recv_disconnect_req(struct mbuf *m, struct hci_link *link) |
| 858 | { |
| 859 | l2cap_cmd_hdr_t cmd; |
| 860 | l2cap_discon_req_cp cp; |
| 861 | l2cap_discon_rsp_cp rp; |
| 862 | struct l2cap_channel *chan; |
| 863 | |
| 864 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 865 | m_adj(m, sizeof(cmd)); |
| 866 | |
| 867 | m_copydata(m, 0, sizeof(cp), &cp); |
| 868 | m_adj(m, sizeof(cp)); |
| 869 | |
| 870 | cp.scid = le16toh(cp.scid); |
| 871 | cp.dcid = le16toh(cp.dcid); |
| 872 | |
| 873 | chan = l2cap_cid_lookup(cp.dcid); |
| 874 | if (chan == NULL || chan->lc_link != link || chan->lc_rcid != cp.scid) { |
| 875 | l2cap_send_command_rej(link, cmd.ident, L2CAP_REJ_INVALID_CID, |
| 876 | cp.dcid, cp.scid); |
| 877 | return; |
| 878 | } |
| 879 | |
| 880 | rp.dcid = htole16(chan->lc_lcid); |
| 881 | rp.scid = htole16(chan->lc_rcid); |
| 882 | l2cap_send_signal(link, L2CAP_DISCONNECT_RSP, cmd.ident, |
| 883 | sizeof(rp), &rp); |
| 884 | |
| 885 | if (chan->lc_state != L2CAP_CLOSED) |
| 886 | l2cap_close(chan, 0); |
| 887 | } |
| 888 | |
| 889 | /* |
| 890 | * Process Received Disconnect Response. We must validate scid and dcid but |
| 891 | * unless we were waiting for this signal, ignore it. |
| 892 | */ |
| 893 | static void |
| 894 | l2cap_recv_disconnect_rsp(struct mbuf *m, struct hci_link *link) |
| 895 | { |
| 896 | l2cap_cmd_hdr_t cmd; |
| 897 | l2cap_discon_rsp_cp cp; |
| 898 | struct l2cap_req *req; |
| 899 | struct l2cap_channel *chan; |
| 900 | |
| 901 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 902 | m_adj(m, sizeof(cmd)); |
| 903 | |
| 904 | m_copydata(m, 0, sizeof(cp), &cp); |
| 905 | m_adj(m, sizeof(cp)); |
| 906 | |
| 907 | cp.scid = le16toh(cp.scid); |
| 908 | cp.dcid = le16toh(cp.dcid); |
| 909 | |
| 910 | req = l2cap_request_lookup(link, cmd.ident); |
| 911 | if (req == NULL || req->lr_code != L2CAP_DISCONNECT_REQ) |
| 912 | return; |
| 913 | |
| 914 | chan = req->lr_chan; |
| 915 | if (chan == NULL |
| 916 | || chan->lc_lcid != cp.scid |
| 917 | || chan->lc_rcid != cp.dcid) |
| 918 | return; |
| 919 | |
| 920 | l2cap_request_free(req); |
| 921 | |
| 922 | if (chan->lc_state != L2CAP_WAIT_DISCONNECT) |
| 923 | return; |
| 924 | |
| 925 | l2cap_close(chan, 0); |
| 926 | } |
| 927 | |
| 928 | /* |
| 929 | * Process Received Info Request. |
| 930 | */ |
| 931 | static void |
| 932 | l2cap_recv_info_req(struct mbuf *m, struct hci_link *link) |
| 933 | { |
| 934 | l2cap_cmd_hdr_t cmd; |
| 935 | l2cap_info_req_cp cp; |
| 936 | uint8_t rsp[12]; |
| 937 | |
| 938 | m_copydata(m, 0, sizeof(cmd), &cmd); |
| 939 | m_adj(m, sizeof(cmd)); |
| 940 | |
| 941 | m_copydata(m, 0, sizeof(cp), &cp); |
| 942 | m_adj(m, sizeof(cp)); |
| 943 | |
| 944 | cp.type = le16toh(cp.type); |
| 945 | switch(cp.type) { |
| 946 | case L2CAP_EXTENDED_FEATURES: |
| 947 | /* |
| 948 | * 32-bit data field, unused bits set to zero |
| 949 | * |
| 950 | * octet bit feature |
| 951 | * 0 0 Flow control mode |
| 952 | * 0 1 Retransmission mode |
| 953 | * 0 2 Bi-directional QoS |
| 954 | * 0 3 Enhanced retransmission mode |
| 955 | * 0 4 Streaming mode |
| 956 | * 0 5 FCS option |
| 957 | * 0 6 Extended flow specification for BR/EDR |
| 958 | * 0 7 Fixed channels (SET) |
| 959 | * 1 0 Extended window size |
| 960 | * 1 1 Unicast connectionless data reception |
| 961 | */ |
| 962 | le16enc(rsp + 0, cp.type); |
| 963 | le16enc(rsp + 2, L2CAP_SUCCESS); |
| 964 | le32enc(rsp + 4, 0x00000080); |
| 965 | l2cap_send_signal(link, L2CAP_INFO_RSP, cmd.ident, 8, rsp); |
| 966 | break; |
| 967 | |
| 968 | case L2CAP_FIXED_CHANNELS: |
| 969 | /* |
| 970 | * 64-bit data field, unused bits set to zero |
| 971 | * |
| 972 | * octet bit channel |
| 973 | * 0 0 0x0000 Null |
| 974 | * 0 1 0x0001 L2CAP Signalling Channel (SET) |
| 975 | * 0 2 0x0002 Connectionless Reception |
| 976 | * 0 3 0x0003 AMP Manager Protocol Channel |
| 977 | * 0 7 0x0007 BR/EDR Security Manager |
| 978 | * 7 7 0x003f AMP Test Manager |
| 979 | */ |
| 980 | le16enc(rsp + 0, cp.type); |
| 981 | le16enc(rsp + 2, L2CAP_SUCCESS); |
| 982 | le64enc(rsp + 4, 0x0000000000000002); |
| 983 | l2cap_send_signal(link, L2CAP_INFO_RSP, cmd.ident, 12, rsp); |
| 984 | break; |
| 985 | |
| 986 | case L2CAP_CONNLESS_MTU: |
| 987 | default: |
| 988 | le16enc(rsp + 0, cp.type); |
| 989 | le16enc(rsp + 2, L2CAP_NOT_SUPPORTED); |
| 990 | l2cap_send_signal(link, L2CAP_INFO_RSP, cmd.ident, 4, rsp); |
| 991 | break; |
| 992 | } |
| 993 | } |
| 994 | |
| 995 | /* |
| 996 | * Construct signal and wrap in C-Frame for link. |
| 997 | */ |
| 998 | static int |
| 999 | l2cap_send_signal(struct hci_link *link, uint8_t code, uint8_t ident, |
| 1000 | uint16_t length, void *data) |
| 1001 | { |
| 1002 | struct mbuf *m; |
| 1003 | l2cap_hdr_t *hdr; |
| 1004 | l2cap_cmd_hdr_t *cmd; |
| 1005 | |
| 1006 | KASSERT(link != NULL); |
| 1007 | KASSERT(sizeof(l2cap_cmd_hdr_t) + length <= link->hl_mtu); |
| 1008 | |
| 1009 | m = m_gethdr(M_DONTWAIT, MT_DATA); |
| 1010 | if (m == NULL) |
| 1011 | return ENOMEM; |
| 1012 | |
| 1013 | hdr = mtod(m, l2cap_hdr_t *); |
| 1014 | cmd = (l2cap_cmd_hdr_t *)(hdr + 1); |
| 1015 | |
| 1016 | m->m_len = m->m_pkthdr.len = MHLEN; |
| 1017 | |
| 1018 | /* Command Data */ |
| 1019 | if (length > 0) |
| 1020 | m_copyback(m, sizeof(*hdr) + sizeof(*cmd), length, data); |
| 1021 | |
| 1022 | /* Command Header */ |
| 1023 | cmd->code = code; |
| 1024 | cmd->ident = ident; |
| 1025 | cmd->length = htole16(length); |
| 1026 | length += sizeof(*cmd); |
| 1027 | |
| 1028 | /* C-Frame Header */ |
| 1029 | hdr->length = htole16(length); |
| 1030 | hdr->dcid = htole16(L2CAP_SIGNAL_CID); |
| 1031 | length += sizeof(*hdr); |
| 1032 | |
| 1033 | if (m->m_pkthdr.len != MAX(MHLEN, length)) { |
| 1034 | m_freem(m); |
| 1035 | return ENOMEM; |
| 1036 | } |
| 1037 | |
| 1038 | m->m_pkthdr.len = length; |
| 1039 | m->m_len = MIN(length, MHLEN); |
| 1040 | |
| 1041 | DPRINTFN(2, "(%s) code %d, ident %d, len %d\n" , |
| 1042 | device_xname(link->hl_unit->hci_dev), code, ident, length); |
| 1043 | |
| 1044 | return hci_acl_send(m, link, NULL); |
| 1045 | } |
| 1046 | |
| 1047 | /* |
| 1048 | * Send Command Reject packet. |
| 1049 | */ |
| 1050 | static int |
| 1051 | l2cap_send_command_rej(struct hci_link *link, uint8_t ident, |
| 1052 | int reason, ...) |
| 1053 | { |
| 1054 | l2cap_cmd_rej_cp cp; |
| 1055 | int len = 0; |
| 1056 | va_list ap; |
| 1057 | |
| 1058 | va_start(ap, reason); |
| 1059 | |
| 1060 | cp.reason = htole16(reason); |
| 1061 | |
| 1062 | switch (reason) { |
| 1063 | case L2CAP_REJ_NOT_UNDERSTOOD: |
| 1064 | len = 2; |
| 1065 | break; |
| 1066 | |
| 1067 | case L2CAP_REJ_MTU_EXCEEDED: |
| 1068 | len = 4; |
| 1069 | cp.data[0] = va_arg(ap, int); /* SigMTU */ |
| 1070 | cp.data[0] = htole16(cp.data[0]); |
| 1071 | break; |
| 1072 | |
| 1073 | case L2CAP_REJ_INVALID_CID: |
| 1074 | len = 6; |
| 1075 | cp.data[0] = va_arg(ap, int); /* dcid */ |
| 1076 | cp.data[0] = htole16(cp.data[0]); |
| 1077 | cp.data[1] = va_arg(ap, int); /* scid */ |
| 1078 | cp.data[1] = htole16(cp.data[1]); |
| 1079 | break; |
| 1080 | |
| 1081 | default: |
| 1082 | UNKNOWN(reason); |
| 1083 | va_end(ap); |
| 1084 | return EINVAL; |
| 1085 | } |
| 1086 | |
| 1087 | va_end(ap); |
| 1088 | |
| 1089 | return l2cap_send_signal(link, L2CAP_COMMAND_REJ, ident, len, &cp); |
| 1090 | } |
| 1091 | |
| 1092 | /* |
| 1093 | * Send Connect Request |
| 1094 | */ |
| 1095 | int |
| 1096 | l2cap_send_connect_req(struct l2cap_channel *chan) |
| 1097 | { |
| 1098 | l2cap_con_req_cp cp; |
| 1099 | int err; |
| 1100 | |
| 1101 | err = l2cap_request_alloc(chan, L2CAP_CONNECT_REQ); |
| 1102 | if (err) |
| 1103 | return err; |
| 1104 | |
| 1105 | cp.psm = htole16(chan->lc_raddr.bt_psm); |
| 1106 | cp.scid = htole16(chan->lc_lcid); |
| 1107 | |
| 1108 | return l2cap_send_signal(chan->lc_link, L2CAP_CONNECT_REQ, |
| 1109 | chan->lc_link->hl_lastid, sizeof(cp), &cp); |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * Send Config Request |
| 1114 | * |
| 1115 | * For outgoing config request, we only put options in the packet if they |
| 1116 | * differ from the default and would have to be actioned. We dont support |
| 1117 | * enough option types to make overflowing SigMTU an issue so it can all |
| 1118 | * go in one packet. |
| 1119 | */ |
| 1120 | int |
| 1121 | l2cap_send_config_req(struct l2cap_channel *chan) |
| 1122 | { |
| 1123 | l2cap_cfg_req_cp *cp; |
| 1124 | l2cap_cfg_opt_t *opt; |
| 1125 | l2cap_cfg_opt_val_t *val; |
| 1126 | uint8_t *next, buf[L2CAP_MTU_MINIMUM]; |
| 1127 | int err; |
| 1128 | |
| 1129 | err = l2cap_request_alloc(chan, L2CAP_CONFIG_REQ); |
| 1130 | if (err) |
| 1131 | return err; |
| 1132 | |
| 1133 | /* Config Header (4 octets) */ |
| 1134 | cp = (l2cap_cfg_req_cp *)buf; |
| 1135 | cp->dcid = htole16(chan->lc_rcid); |
| 1136 | cp->flags = 0; /* "No Continuation" */ |
| 1137 | |
| 1138 | next = buf + sizeof(l2cap_cfg_req_cp); |
| 1139 | |
| 1140 | /* Incoming MTU (4 octets) */ |
| 1141 | if (chan->lc_imtu != L2CAP_MTU_DEFAULT) { |
| 1142 | opt = (l2cap_cfg_opt_t *)next; |
| 1143 | opt->type = L2CAP_OPT_MTU; |
| 1144 | opt->length = L2CAP_OPT_MTU_SIZE; |
| 1145 | |
| 1146 | val = (l2cap_cfg_opt_val_t *)(opt + 1); |
| 1147 | val->mtu = htole16(chan->lc_imtu); |
| 1148 | |
| 1149 | next += sizeof(l2cap_cfg_opt_t) + L2CAP_OPT_MTU_SIZE; |
| 1150 | } |
| 1151 | |
| 1152 | /* Flush Timeout (4 octets) */ |
| 1153 | if (chan->lc_flush != L2CAP_FLUSH_TIMO_DEFAULT) { |
| 1154 | opt = (l2cap_cfg_opt_t *)next; |
| 1155 | opt->type = L2CAP_OPT_FLUSH_TIMO; |
| 1156 | opt->length = L2CAP_OPT_FLUSH_TIMO_SIZE; |
| 1157 | |
| 1158 | val = (l2cap_cfg_opt_val_t *)(opt + 1); |
| 1159 | val->flush_timo = htole16(chan->lc_flush); |
| 1160 | |
| 1161 | next += sizeof(l2cap_cfg_opt_t) + L2CAP_OPT_FLUSH_TIMO_SIZE; |
| 1162 | } |
| 1163 | |
| 1164 | /* Outgoing QoS Flow (24 octets) */ |
| 1165 | /* Retransmission & Flow Control (11 octets) */ |
| 1166 | /* |
| 1167 | * From here we need to start paying attention to SigMTU as we have |
| 1168 | * possibly overflowed the minimum supported.. |
| 1169 | */ |
| 1170 | |
| 1171 | return l2cap_send_signal(chan->lc_link, L2CAP_CONFIG_REQ, |
| 1172 | chan->lc_link->hl_lastid, (int)(next - buf), buf); |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * Send Disconnect Request |
| 1177 | */ |
| 1178 | int |
| 1179 | l2cap_send_disconnect_req(struct l2cap_channel *chan) |
| 1180 | { |
| 1181 | l2cap_discon_req_cp cp; |
| 1182 | int err; |
| 1183 | |
| 1184 | err = l2cap_request_alloc(chan, L2CAP_DISCONNECT_REQ); |
| 1185 | if (err) |
| 1186 | return err; |
| 1187 | |
| 1188 | cp.dcid = htole16(chan->lc_rcid); |
| 1189 | cp.scid = htole16(chan->lc_lcid); |
| 1190 | |
| 1191 | return l2cap_send_signal(chan->lc_link, L2CAP_DISCONNECT_REQ, |
| 1192 | chan->lc_link->hl_lastid, sizeof(cp), &cp); |
| 1193 | } |
| 1194 | |
| 1195 | /* |
| 1196 | * Send Connect Response |
| 1197 | */ |
| 1198 | int |
| 1199 | l2cap_send_connect_rsp(struct hci_link *link, uint8_t ident, uint16_t dcid, uint16_t scid, uint16_t result) |
| 1200 | { |
| 1201 | l2cap_con_rsp_cp cp; |
| 1202 | |
| 1203 | memset(&cp, 0, sizeof(cp)); |
| 1204 | cp.dcid = htole16(dcid); |
| 1205 | cp.scid = htole16(scid); |
| 1206 | cp.result = htole16(result); |
| 1207 | |
| 1208 | return l2cap_send_signal(link, L2CAP_CONNECT_RSP, ident, sizeof(cp), &cp); |
| 1209 | } |
| 1210 | |
| 1211 | /* |
| 1212 | * copy in QoS buffer to host |
| 1213 | */ |
| 1214 | static void |
| 1215 | l2cap_qos_btoh(l2cap_qos_t *qos, void *buf) |
| 1216 | { |
| 1217 | l2cap_qos_t *src = buf; |
| 1218 | |
| 1219 | qos->flags = src->flags; |
| 1220 | qos->service_type = src->service_type; |
| 1221 | qos->token_rate = le32toh(src->token_rate); |
| 1222 | qos->token_bucket_size = le32toh(src->token_bucket_size); |
| 1223 | qos->peak_bandwidth = le32toh(src->peak_bandwidth); |
| 1224 | qos->latency = le32toh(src->latency); |
| 1225 | qos->delay_variation = le32toh(src->delay_variation); |
| 1226 | } |
| 1227 | |
| 1228 | /* |
| 1229 | * copy out host QoS to buffer |
| 1230 | */ |
| 1231 | static void |
| 1232 | l2cap_qos_htob(void *buf, l2cap_qos_t *qos) |
| 1233 | { |
| 1234 | l2cap_qos_t *dst = buf; |
| 1235 | |
| 1236 | dst->flags = qos->flags; |
| 1237 | dst->service_type = qos->service_type; |
| 1238 | dst->token_rate = htole32(qos->token_rate); |
| 1239 | dst->token_bucket_size = htole32(qos->token_bucket_size); |
| 1240 | dst->peak_bandwidth = htole32(qos->peak_bandwidth); |
| 1241 | dst->latency = htole32(qos->latency); |
| 1242 | dst->delay_variation = htole32(qos->delay_variation); |
| 1243 | } |
| 1244 | |