1 /*- 2 * (MPSAFE) 3 * 4 * Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com> 5 * All rights reserved. 6 * 7 * ng_h4.c 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $Id: ng_h4.c,v 1.10 2005/10/31 17:57:43 max Exp $ 31 * $FreeBSD: head/sys/netgraph/bluetooth/drivers/h4/ng_h4.c 243882 2012-12-05 08:04:20Z glebius $ 32 * 33 * Based on: 34 * --------- 35 * 36 * FreeBSD: src/sys/netgraph/ng_tty.c 37 * Author: Archie Cobbs <archie@freebsd.org> 38 * 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/conf.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/fcntl.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/caps.h> 51 #include <sys/socket.h> 52 #include <sys/tty.h> 53 #include <sys/ttycom.h> 54 #include <net/if.h> 55 #include <net/if_var.h> 56 #include <netgraph7/ng_message.h> 57 #include <netgraph7/netgraph.h> 58 #include <netgraph7/ng_parse.h> 59 #include <netgraph7/bluetooth/include/ng_bluetooth.h> 60 #include <netgraph7/bluetooth/include/ng_hci.h> 61 #include <netgraph7/bluetooth/include/ng_h4.h> 62 #include <netgraph7/bluetooth/drivers/h4/ng_h4_var.h> 63 #include <netgraph7/bluetooth/drivers/h4/ng_h4_prse.h> 64 65 /***************************************************************************** 66 ***************************************************************************** 67 ** This node implements a Bluetooth HCI UART transport layer as per chapter 68 ** H4 of the Bluetooth Specification Book v1.1. It is a terminal line 69 ** discipline that is also a netgraph node. Installing this line discipline 70 ** on a terminal device instantiates a new netgraph node of this type, which 71 ** allows access to the device via the "hook" hook of the node. 72 ** 73 ** Once the line discipline is installed, you can find out the name of the 74 ** corresponding netgraph node via a NGIOCGINFO ioctl(). 75 ***************************************************************************** 76 *****************************************************************************/ 77 78 /* MALLOC define */ 79 #ifndef NG_SEPARATE_MALLOC 80 MALLOC_DEFINE(M_NETGRAPH_H4, "netgraph_h4", "Netgraph Bluetooth H4 node"); 81 #else 82 #define M_NETGRAPH_H4 M_NETGRAPH 83 #endif /* NG_SEPARATE_MALLOC */ 84 85 /* Line discipline methods */ 86 static int ng_h4_open (struct cdev *, struct tty *); 87 static int ng_h4_close (struct tty *, int); 88 static int ng_h4_read (struct tty *, struct uio *, int); 89 static int ng_h4_write (struct tty *, struct uio *, int); 90 static int ng_h4_input (int, struct tty *); 91 static int ng_h4_start (struct tty *); 92 static int ng_h4_ioctl (struct tty *, u_long, caddr_t, 93 int, struct ucred *); 94 95 /* Line discipline descriptor */ 96 static struct linesw ng_h4_disc = { 97 ng_h4_open, /* open */ 98 ng_h4_close, /* close */ 99 ng_h4_read, /* read */ 100 ng_h4_write, /* write */ 101 ng_h4_ioctl, /* ioctl */ 102 ng_h4_input, /* input */ 103 ng_h4_start, /* start */ 104 ttymodem /* modem */ 105 }; 106 107 /* Netgraph methods */ 108 static ng_constructor_t ng_h4_constructor; 109 static ng_rcvmsg_t ng_h4_rcvmsg; 110 static ng_shutdown_t ng_h4_shutdown; 111 static ng_newhook_t ng_h4_newhook; 112 static ng_connect_t ng_h4_connect; 113 static ng_rcvdata_t ng_h4_rcvdata; 114 static ng_disconnect_t ng_h4_disconnect; 115 116 /* Other stuff */ 117 static void ng_h4_process_timeout (node_p, hook_p, void *, int); 118 static int ng_h4_mod_event (module_t, int, void *); 119 120 /* Netgraph node type descriptor */ 121 static struct ng_type typestruct = { 122 .version = NG_ABI_VERSION, 123 .name = NG_H4_NODE_TYPE, 124 .mod_event = ng_h4_mod_event, 125 .constructor = ng_h4_constructor, 126 .rcvmsg = ng_h4_rcvmsg, 127 .shutdown = ng_h4_shutdown, 128 .newhook = ng_h4_newhook, 129 .connect = ng_h4_connect, 130 .rcvdata = ng_h4_rcvdata, 131 .disconnect = ng_h4_disconnect, 132 .cmdlist = ng_h4_cmdlist 133 }; 134 NETGRAPH_INIT(h4, &typestruct); 135 MODULE_VERSION(ng_h4, NG_BLUETOOTH_VERSION); 136 137 static int ng_h4_node = 0; 138 139 /***************************************************************************** 140 ***************************************************************************** 141 ** Line discipline methods 142 ***************************************************************************** 143 *****************************************************************************/ 144 145 /* 146 * Set our line discipline on the tty. 147 */ 148 149 static int 150 ng_h4_open(struct cdev *dev, struct tty *tp) 151 { 152 char name[NG_NODESIZ]; 153 ng_h4_info_p sc = NULL; 154 int error; 155 156 /* Super-user only */ 157 error = caps_priv_check_self(SYSCAP_NONET_NETGRAPH); 158 if (error != 0) 159 return (error); 160 161 /* Initialize private struct */ 162 sc = kmalloc(sizeof(*sc), M_NETGRAPH_H4, M_WAITOK | M_NULLOK | M_ZERO); 163 if (sc == NULL) 164 return (ENOMEM); 165 166 lwkt_gettoken(&tp->t_token); 167 sc->tp = tp; 168 sc->debug = NG_H4_WARN_LEVEL; 169 170 sc->state = NG_H4_W4_PKT_IND; 171 sc->want = 1; 172 sc->got = 0; 173 174 sc->outq.ifq_maxlen = NG_H4_DEFAULTQLEN; 175 ng_callout_init(&sc->timo); 176 177 NG_H4_LOCK(sc); 178 179 /* Setup netgraph node */ 180 error = ng_make_node_common(&typestruct, &sc->node); 181 if (error != 0) { 182 NG_H4_UNLOCK(sc); 183 184 kprintf("%s: Unable to create new node!\n", __func__); 185 186 bzero(sc, sizeof(*sc)); 187 kfree(sc, M_NETGRAPH_H4); 188 189 lwkt_reltoken(&tp->t_token); 190 return (error); 191 } 192 193 /* Assign node its name */ 194 ksnprintf(name, sizeof(name), "%s%d", typestruct.name, ng_h4_node ++); 195 196 error = ng_name_node(sc->node, name); 197 if (error != 0) { 198 NG_H4_UNLOCK(sc); 199 200 kprintf("%s: %s - node name exists?\n", __func__, name); 201 202 NG_NODE_UNREF(sc->node); 203 bzero(sc, sizeof(*sc)); 204 kfree(sc, M_NETGRAPH_H4); 205 206 lwkt_reltoken(&tp->t_token); 207 return (error); 208 } 209 210 /* Set back pointers */ 211 NG_NODE_SET_PRIVATE(sc->node, sc); 212 tp->t_sc = (caddr_t) sc; 213 214 /* The node has to be a WRITER because data can change node status */ 215 NG_NODE_FORCE_WRITER(sc->node); 216 217 /* 218 * Pre-allocate cblocks to the an appropriate amount. 219 * I'm not sure what is appropriate. 220 */ 221 222 ttyflush(tp, FREAD | FWRITE); 223 clist_alloc_cblocks(&tp->t_canq, 0); 224 clist_alloc_cblocks(&tp->t_rawq, 0); 225 clist_alloc_cblocks(&tp->t_outq, MLEN + NG_H4_HIWATER); 226 227 NG_H4_UNLOCK(sc); 228 229 lwkt_reltoken(&tp->t_token); 230 return (error); 231 } /* ng_h4_open */ 232 233 /* 234 * Line specific close routine, called from device close routine 235 * and from ttioctl. This causes the node to be destroyed as well. 236 */ 237 238 static int 239 ng_h4_close(struct tty *tp, int flag) 240 { 241 ng_h4_info_p sc = (ng_h4_info_p) tp->t_sc; 242 243 lwkt_gettoken(&tp->t_token); 244 ttyflush(tp, FREAD | FWRITE); 245 clist_free_cblocks(&tp->t_outq); 246 247 if (sc != NULL) { 248 NG_H4_LOCK(sc); 249 250 if (callout_pending(&sc->timo)) 251 ng_uncallout(&sc->timo, sc->node); 252 253 tp->t_sc = NULL; 254 sc->dying = 1; 255 256 NG_H4_UNLOCK(sc); 257 258 ng_rmnode_self(sc->node); 259 } 260 261 lwkt_reltoken(&tp->t_token); 262 return (0); 263 } /* ng_h4_close */ 264 265 /* 266 * Once the device has been turned into a node, we don't allow reading. 267 */ 268 269 static int 270 ng_h4_read(struct tty *tp, struct uio *uio, int flag) 271 { 272 return (EIO); 273 } /* ng_h4_read */ 274 275 /* 276 * Once the device has been turned into a node, we don't allow writing. 277 */ 278 279 static int 280 ng_h4_write(struct tty *tp, struct uio *uio, int flag) 281 { 282 return (EIO); 283 } /* ng_h4_write */ 284 285 /* 286 * We implement the NGIOCGINFO ioctl() defined in ng_message.h. 287 */ 288 289 static int 290 ng_h4_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, 291 struct ucred *cred) 292 { 293 ng_h4_info_p sc = (ng_h4_info_p) tp->t_sc; 294 int error = 0; 295 296 if (sc == NULL) 297 return (ENXIO); 298 299 lwkt_gettoken(&tp->t_token); 300 NG_H4_LOCK(sc); 301 302 switch (cmd) { 303 case NGIOCGINFO: 304 #undef NI 305 #define NI(x) ((struct nodeinfo *)(x)) 306 307 bzero(data, sizeof(*NI(data))); 308 309 if (NG_NODE_HAS_NAME(sc->node)) 310 strncpy(NI(data)->name, NG_NODE_NAME(sc->node), 311 sizeof(NI(data)->name) - 1); 312 313 strncpy(NI(data)->type, sc->node->nd_type->name, 314 sizeof(NI(data)->type) - 1); 315 316 NI(data)->id = (u_int32_t) ng_node2ID(sc->node); 317 NI(data)->hooks = NG_NODE_NUMHOOKS(sc->node); 318 break; 319 320 default: 321 error = ENOIOCTL; 322 break; 323 } 324 325 NG_H4_UNLOCK(sc); 326 327 lwkt_reltoken(&tp->t_token); 328 return (error); 329 } /* ng_h4_ioctl */ 330 331 /* 332 * Receive data coming from the device. We get one character at a time, which 333 * is kindof silly. 334 */ 335 336 static int 337 ng_h4_input(int c, struct tty *tp) 338 { 339 ng_h4_info_p sc = (ng_h4_info_p) tp->t_sc; 340 341 lwkt_gettoken(&tp->t_token); 342 if (sc == NULL || tp != sc->tp || 343 sc->node == NULL || NG_NODE_NOT_VALID(sc->node)) { 344 lwkt_reltoken(&tp->t_token); 345 return (0); 346 } 347 348 NG_H4_LOCK(sc); 349 350 /* Check for error conditions */ 351 if ((tp->t_state & TS_CONNECTED) == 0) { 352 NG_H4_INFO("%s: %s - no carrier\n", __func__, 353 NG_NODE_NAME(sc->node)); 354 355 sc->state = NG_H4_W4_PKT_IND; 356 sc->want = 1; 357 sc->got = 0; 358 359 NG_H4_UNLOCK(sc); 360 361 lwkt_reltoken(&tp->t_token); 362 return (0); /* XXX Loss of synchronization here! */ 363 } 364 365 /* Check for framing error or overrun on this char */ 366 if (c & TTY_ERRORMASK) { 367 NG_H4_ERR("%s: %s - line error %#x, c=%#x\n", __func__, 368 NG_NODE_NAME(sc->node), c & TTY_ERRORMASK, 369 c & TTY_CHARMASK); 370 371 NG_H4_STAT_IERROR(sc->stat); 372 373 sc->state = NG_H4_W4_PKT_IND; 374 sc->want = 1; 375 sc->got = 0; 376 377 NG_H4_UNLOCK(sc); 378 379 lwkt_reltoken(&tp->t_token); 380 return (0); /* XXX Loss of synchronization here! */ 381 } 382 383 NG_H4_STAT_BYTES_RECV(sc->stat, 1); 384 385 /* Append char to mbuf */ 386 if (sc->got >= sizeof(sc->ibuf)) { 387 NG_H4_ALERT("%s: %s - input buffer overflow, c=%#x, got=%d\n", 388 __func__, NG_NODE_NAME(sc->node), c & TTY_CHARMASK, 389 sc->got); 390 391 NG_H4_STAT_IERROR(sc->stat); 392 393 sc->state = NG_H4_W4_PKT_IND; 394 sc->want = 1; 395 sc->got = 0; 396 397 NG_H4_UNLOCK(sc); 398 399 lwkt_reltoken(&tp->t_token); 400 return (0); /* XXX Loss of synchronization here! */ 401 } 402 403 sc->ibuf[sc->got ++] = (c & TTY_CHARMASK); 404 405 NG_H4_INFO("%s: %s - got char %#x, want=%d, got=%d\n", __func__, 406 NG_NODE_NAME(sc->node), c, sc->want, sc->got); 407 408 if (sc->got < sc->want) { 409 NG_H4_UNLOCK(sc); 410 411 lwkt_reltoken(&tp->t_token); 412 return (0); /* Wait for more */ 413 } 414 415 switch (sc->state) { 416 /* Got packet indicator */ 417 case NG_H4_W4_PKT_IND: 418 NG_H4_INFO("%s: %s - got packet indicator %#x\n", __func__, 419 NG_NODE_NAME(sc->node), sc->ibuf[0]); 420 421 sc->state = NG_H4_W4_PKT_HDR; 422 423 /* 424 * Since packet indicator included in the packet header 425 * just set sc->want to sizeof(packet header). 426 */ 427 428 switch (sc->ibuf[0]) { 429 case NG_HCI_ACL_DATA_PKT: 430 sc->want = sizeof(ng_hci_acldata_pkt_t); 431 break; 432 433 case NG_HCI_SCO_DATA_PKT: 434 sc->want = sizeof(ng_hci_scodata_pkt_t); 435 break; 436 437 case NG_HCI_EVENT_PKT: 438 sc->want = sizeof(ng_hci_event_pkt_t); 439 break; 440 441 default: 442 NG_H4_WARN("%s: %s - ignoring unknown packet " \ 443 "type=%#x\n", __func__, NG_NODE_NAME(sc->node), 444 sc->ibuf[0]); 445 446 NG_H4_STAT_IERROR(sc->stat); 447 448 sc->state = NG_H4_W4_PKT_IND; 449 sc->want = 1; 450 sc->got = 0; 451 break; 452 } 453 break; 454 455 /* Got packet header */ 456 case NG_H4_W4_PKT_HDR: 457 sc->state = NG_H4_W4_PKT_DATA; 458 459 switch (sc->ibuf[0]) { 460 case NG_HCI_ACL_DATA_PKT: 461 c = le16toh(((ng_hci_acldata_pkt_t *) 462 (sc->ibuf))->length); 463 break; 464 465 case NG_HCI_SCO_DATA_PKT: 466 c = ((ng_hci_scodata_pkt_t *)(sc->ibuf))->length; 467 break; 468 469 case NG_HCI_EVENT_PKT: 470 c = ((ng_hci_event_pkt_t *)(sc->ibuf))->length; 471 break; 472 473 default: 474 KASSERT((0), ("Invalid packet type=%#x", 475 sc->ibuf[0])); 476 break; 477 } 478 479 NG_H4_INFO("%s: %s - got packet header, packet type=%#x, " \ 480 "packet size=%d, payload size=%d\n", __func__, 481 NG_NODE_NAME(sc->node), sc->ibuf[0], sc->got, c); 482 483 if (c > 0) { 484 sc->want += c; 485 486 /* 487 * Try to prevent possible buffer overrun 488 * 489 * XXX I'm *really* confused here. It turns out 490 * that Xircom card sends us packets with length 491 * greater then 512 bytes! This is greater then 492 * our old receive buffer (ibuf) size. In the same 493 * time the card demands from us *not* to send 494 * packets greater then 192 bytes. Weird! How the 495 * hell i should know how big *receive* buffer 496 * should be? For now increase receiving buffer 497 * size to 1K and add the following check. 498 */ 499 500 if (sc->want >= sizeof(sc->ibuf)) { 501 int b; 502 503 NG_H4_ALERT("%s: %s - packet too big for " \ 504 "buffer, type=%#x, got=%d, want=%d, " \ 505 "length=%d\n", __func__, 506 NG_NODE_NAME(sc->node), sc->ibuf[0], 507 sc->got, sc->want, c); 508 509 NG_H4_ALERT("Packet header:\n"); 510 for (b = 0; b < sc->got; b++) 511 NG_H4_ALERT("%#x ", sc->ibuf[b]); 512 NG_H4_ALERT("\n"); 513 514 /* Reset state */ 515 NG_H4_STAT_IERROR(sc->stat); 516 517 sc->state = NG_H4_W4_PKT_IND; 518 sc->want = 1; 519 sc->got = 0; 520 } 521 522 break; 523 } 524 525 /* else FALLTHROUGH and deliver frame */ 526 /* XXX Is this true? Should we deliver empty frame? */ 527 528 /* Got packet data */ 529 case NG_H4_W4_PKT_DATA: 530 NG_H4_INFO("%s: %s - got full packet, packet type=%#x, " \ 531 "packet size=%d\n", __func__, 532 NG_NODE_NAME(sc->node), sc->ibuf[0], sc->got); 533 534 if (sc->hook != NULL && NG_HOOK_IS_VALID(sc->hook)) { 535 struct mbuf *m = NULL; 536 537 MGETHDR(m, M_NOWAIT, MT_DATA); 538 if (m != NULL && m_copyback2(m, 0, sc->got, sc->ibuf, 539 M_NOWAIT) == 0) { 540 NG_SEND_DATA_ONLY(c, sc->hook, m); 541 } else { 542 NG_H4_ERR("%s: %s - could not get mbuf\n", 543 __func__, NG_NODE_NAME(sc->node)); 544 NG_H4_STAT_IERROR(sc->stat); 545 m_freem(m); 546 } 547 } 548 549 sc->state = NG_H4_W4_PKT_IND; 550 sc->want = 1; 551 sc->got = 0; 552 553 NG_H4_STAT_PCKTS_RECV(sc->stat); 554 break; 555 556 default: 557 KASSERT((0), ("Invalid H4 node state=%d", sc->state)); 558 break; 559 } 560 561 NG_H4_UNLOCK(sc); 562 563 lwkt_reltoken(&tp->t_token); 564 return (0); 565 } /* ng_h4_input */ 566 567 /* 568 * This is called when the device driver is ready for more output. Called from 569 * tty system. 570 */ 571 572 static int 573 ng_h4_start(struct tty *tp) 574 { 575 ng_h4_info_p sc = (ng_h4_info_p) tp->t_sc; 576 struct mbuf *m = NULL; 577 int size; 578 579 lwkt_gettoken(&tp->t_token); 580 if (sc == NULL || tp != sc->tp || 581 sc->node == NULL || NG_NODE_NOT_VALID(sc->node)) { 582 lwkt_reltoken(&tp->t_token); 583 return (0); 584 } 585 586 #if 0 587 while (tp->t_outq.c_cc < NG_H4_HIWATER) { /* XXX 2.2 specific ? */ 588 #else 589 while (1) { 590 #endif 591 /* Remove first mbuf from queue */ 592 IF_DEQUEUE(&sc->outq, m); 593 if (m == NULL) 594 break; 595 596 /* Send as much of it as possible */ 597 while (m != NULL) { 598 size = m->m_len - clist_btoq(mtod(m, u_char *), 599 m->m_len, &tp->t_outq); 600 601 NG_H4_LOCK(sc); 602 NG_H4_STAT_BYTES_SENT(sc->stat, size); 603 NG_H4_UNLOCK(sc); 604 605 m->m_data += size; 606 m->m_len -= size; 607 if (m->m_len > 0) 608 break; /* device can't take no more */ 609 610 m = m_free(m); 611 } 612 613 /* Put remainder of mbuf chain (if any) back on queue */ 614 if (m != NULL) { 615 IF_PREPEND(&sc->outq, m); 616 break; 617 } 618 619 /* Full packet has been sent */ 620 NG_H4_LOCK(sc); 621 NG_H4_STAT_PCKTS_SENT(sc->stat); 622 NG_H4_UNLOCK(sc); 623 } 624 625 /* 626 * Call output process whether or not there is any output. We are 627 * being called in lieu of ttstart and must do what it would. 628 */ 629 630 if (tp->t_oproc != NULL) 631 (*tp->t_oproc) (tp); 632 633 /* 634 * This timeout is needed for operation on a pseudo-tty, because the 635 * pty code doesn't call pppstart after it has drained the t_outq. 636 */ 637 638 NG_H4_LOCK(sc); 639 640 if (!IF_QEMPTY(&sc->outq) && !callout_pending(&sc->timo)) 641 ng_callout(&sc->timo, sc->node, NULL, 1, 642 ng_h4_process_timeout, NULL, 0); 643 644 NG_H4_UNLOCK(sc); 645 646 lwkt_reltoken(&tp->t_token); 647 return (0); 648 } /* ng_h4_start */ 649 650 /***************************************************************************** 651 ***************************************************************************** 652 ** Netgraph node methods 653 ***************************************************************************** 654 *****************************************************************************/ 655 656 /* 657 * Initialize a new node of this type. We only allow nodes to be created as 658 * a result of setting the line discipline on a tty, so always return an error 659 * if not. 660 */ 661 662 static int 663 ng_h4_constructor(node_p node) 664 { 665 return (EOPNOTSUPP); 666 } /* ng_h4_constructor */ 667 668 /* 669 * Add a new hook. There can only be one. 670 */ 671 672 static int 673 ng_h4_newhook(node_p node, hook_p hook, const char *name) 674 { 675 ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(node); 676 677 if (strcmp(name, NG_H4_HOOK) != 0) 678 return (EINVAL); 679 680 NG_H4_LOCK(sc); 681 682 if (sc->hook != NULL) { 683 NG_H4_UNLOCK(sc); 684 return (EISCONN); 685 } 686 sc->hook = hook; 687 688 NG_H4_UNLOCK(sc); 689 690 return (0); 691 } /* ng_h4_newhook */ 692 693 /* 694 * Connect hook. Just say yes. 695 */ 696 697 static int 698 ng_h4_connect(hook_p hook) 699 { 700 ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 701 702 if (hook != sc->hook) 703 panic("%s: hook != sc->hook", __func__); 704 705 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook)); 706 NG_HOOK_FORCE_QUEUE(hook); 707 708 return (0); 709 } /* ng_h4_connect */ 710 711 /* 712 * Disconnect the hook 713 */ 714 715 static int 716 ng_h4_disconnect(hook_p hook) 717 { 718 ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 719 720 /* 721 * We need to check for sc != NULL because we can be called from 722 * ng_h4_close() via ng_rmnode_self() 723 */ 724 725 if (sc != NULL) { 726 if (hook != sc->hook) 727 panic("%s: hook != sc->hook", __func__); 728 729 NG_H4_LOCK(sc); 730 731 /* XXX do we have to untimeout and drain out queue? */ 732 if (callout_pending(&sc->timo)) 733 ng_uncallout(&sc->timo, sc->node); 734 735 IF_DRAIN(&sc->outq); 736 737 sc->state = NG_H4_W4_PKT_IND; 738 sc->want = 1; 739 sc->got = 0; 740 741 sc->hook = NULL; 742 743 NG_H4_UNLOCK(sc); 744 } 745 746 return (0); 747 } /* ng_h4_disconnect */ 748 749 /* 750 * Remove this node. The does the netgraph portion of the shutdown. 751 * This should only be called indirectly from ng_h4_close(). 752 */ 753 754 static int 755 ng_h4_shutdown(node_p node) 756 { 757 ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(node); 758 759 NG_H4_LOCK(sc); 760 761 if (!sc->dying) { 762 NG_H4_UNLOCK(sc); 763 764 NG_NODE_REVIVE(node); /* we will persist */ 765 766 return (EOPNOTSUPP); 767 } 768 769 NG_H4_UNLOCK(sc); 770 771 NG_NODE_SET_PRIVATE(node, NULL); 772 773 IF_DRAIN(&sc->outq); 774 775 NG_NODE_UNREF(node); 776 bzero(sc, sizeof(*sc)); 777 kfree(sc, M_NETGRAPH_H4); 778 779 return (0); 780 } /* ng_h4_shutdown */ 781 782 /* 783 * Receive incoming data from Netgraph system. Put it on our 784 * output queue and start output if necessary. 785 */ 786 787 static int 788 ng_h4_rcvdata(hook_p hook, item_p item) 789 { 790 ng_h4_info_p sc = (ng_h4_info_p)NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 791 struct mbuf *m = NULL; 792 int qlen; 793 794 if (sc == NULL) 795 return (EHOSTDOWN); 796 797 if (hook != sc->hook) 798 panic("%s: hook != sc->hook", __func__); 799 800 NGI_GET_M(item, m); 801 NG_FREE_ITEM(item); 802 803 NG_H4_LOCK(sc); 804 805 if (IF_QFULL(&sc->outq)) { 806 NG_H4_ERR("%s: %s - dropping mbuf, len=%d\n", __func__, 807 NG_NODE_NAME(sc->node), m->m_pkthdr.len); 808 809 NG_H4_STAT_OERROR(sc->stat); 810 IF_DROP(&sc->outq); 811 812 NG_H4_UNLOCK(sc); 813 814 NG_FREE_M(m); 815 816 return (ENOBUFS); 817 } 818 819 NG_H4_INFO("%s: %s - queue mbuf, len=%d\n", __func__, 820 NG_NODE_NAME(sc->node), m->m_pkthdr.len); 821 822 IF_ENQUEUE(&sc->outq, m); 823 qlen = IF_QLEN(&sc->outq); 824 825 NG_H4_UNLOCK(sc); 826 827 /* 828 * If qlen > 1, then we should already have a scheduled callout 829 */ 830 831 if (qlen == 1) 832 ng_h4_start(sc->tp); 833 834 return (0); 835 } /* ng_h4_rcvdata */ 836 837 /* 838 * Receive control message 839 */ 840 841 static int 842 ng_h4_rcvmsg(node_p node, item_p item, hook_p lasthook) 843 { 844 ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(node); 845 struct ng_mesg *msg = NULL, *resp = NULL; 846 int error = 0; 847 848 if (sc == NULL) 849 return (EHOSTDOWN); 850 851 NGI_GET_MSG(item, msg); 852 NG_H4_LOCK(sc); 853 854 switch (msg->header.typecookie) { 855 case NGM_GENERIC_COOKIE: 856 switch (msg->header.cmd) { 857 case NGM_TEXT_STATUS: 858 NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_WAITOK | M_NULLOK); 859 if (resp == NULL) 860 error = ENOMEM; 861 else 862 ksnprintf(resp->data, NG_TEXTRESPONSE, 863 "Hook: %s\n" \ 864 "Debug: %d\n" \ 865 "State: %d\n" \ 866 "Queue: [have:%d,max:%d]\n" \ 867 "Input: [got:%d,want:%d]", 868 (sc->hook != NULL)? NG_H4_HOOK : "", 869 sc->debug, 870 sc->state, 871 IF_QLEN(&sc->outq), 872 sc->outq.ifq_maxlen, 873 sc->got, 874 sc->want); 875 break; 876 877 default: 878 error = EINVAL; 879 break; 880 } 881 break; 882 883 case NGM_H4_COOKIE: 884 switch (msg->header.cmd) { 885 case NGM_H4_NODE_RESET: 886 IF_DRAIN(&sc->outq); 887 sc->state = NG_H4_W4_PKT_IND; 888 sc->want = 1; 889 sc->got = 0; 890 break; 891 892 case NGM_H4_NODE_GET_STATE: 893 NG_MKRESPONSE(resp, msg, sizeof(ng_h4_node_state_ep), 894 M_WAITOK | M_NULLOK); 895 if (resp == NULL) 896 error = ENOMEM; 897 else 898 *((ng_h4_node_state_ep *)(resp->data)) = 899 sc->state; 900 break; 901 902 case NGM_H4_NODE_GET_DEBUG: 903 NG_MKRESPONSE(resp, msg, sizeof(ng_h4_node_debug_ep), 904 M_WAITOK | M_NULLOK); 905 if (resp == NULL) 906 error = ENOMEM; 907 else 908 *((ng_h4_node_debug_ep *)(resp->data)) = 909 sc->debug; 910 break; 911 912 case NGM_H4_NODE_SET_DEBUG: 913 if (msg->header.arglen != sizeof(ng_h4_node_debug_ep)) 914 error = EMSGSIZE; 915 else 916 sc->debug = 917 *((ng_h4_node_debug_ep *)(msg->data)); 918 break; 919 920 case NGM_H4_NODE_GET_QLEN: 921 NG_MKRESPONSE(resp, msg, sizeof(ng_h4_node_qlen_ep), 922 M_WAITOK | M_NULLOK); 923 if (resp == NULL) 924 error = ENOMEM; 925 else 926 *((ng_h4_node_qlen_ep *)(resp->data)) = 927 sc->outq.ifq_maxlen; 928 break; 929 930 case NGM_H4_NODE_SET_QLEN: 931 if (msg->header.arglen != sizeof(ng_h4_node_qlen_ep)) 932 error = EMSGSIZE; 933 else if (*((ng_h4_node_qlen_ep *)(msg->data)) <= 0) 934 error = EINVAL; 935 else 936 sc->outq.ifq_maxlen = 937 *((ng_h4_node_qlen_ep *)(msg->data)); 938 break; 939 940 case NGM_H4_NODE_GET_STAT: 941 NG_MKRESPONSE(resp, msg, sizeof(ng_h4_node_stat_ep), 942 M_WAITOK | M_NULLOK); 943 if (resp == NULL) 944 error = ENOMEM; 945 else 946 bcopy(&sc->stat, resp->data, 947 sizeof(ng_h4_node_stat_ep)); 948 break; 949 950 case NGM_H4_NODE_RESET_STAT: 951 NG_H4_STAT_RESET(sc->stat); 952 break; 953 954 default: 955 error = EINVAL; 956 break; 957 } 958 break; 959 960 default: 961 error = EINVAL; 962 break; 963 } 964 965 NG_H4_UNLOCK(sc); 966 967 NG_RESPOND_MSG(error, node, item, resp); 968 NG_FREE_MSG(msg); 969 970 return (error); 971 } /* ng_h4_rcvmsg */ 972 973 /* 974 * Timeout processing function. 975 * We still have data to output to the device, so try sending more. 976 */ 977 978 static void 979 ng_h4_process_timeout(node_p node, hook_p hook, void *arg1, int arg2) 980 { 981 ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(node); 982 983 ng_h4_start(sc->tp); 984 } /* ng_h4_process_timeout */ 985 986 /* 987 * Handle loading and unloading for this node type 988 */ 989 990 static int 991 ng_h4_mod_event(module_t mod, int event, void *data) 992 { 993 static int ng_h4_ldisc; 994 int error = 0; 995 996 switch (event) { 997 case MOD_LOAD: 998 /* Register line discipline */ 999 crit_enter(); 1000 ng_h4_ldisc = ldisc_register(BTUARTDISC, &ng_h4_disc); 1001 crit_exit(); 1002 1003 if (ng_h4_ldisc < 0) { 1004 kprintf("%s: can't register H4 line discipline\n", 1005 __func__); 1006 error = EIO; 1007 } 1008 break; 1009 1010 case MOD_UNLOAD: 1011 /* Unregister line discipline */ 1012 crit_enter(); 1013 ldisc_deregister(ng_h4_ldisc); 1014 crit_exit(); 1015 break; 1016 1017 default: 1018 error = EOPNOTSUPP; 1019 break; 1020 } 1021 1022 return (error); 1023 } /* ng_h4_mod_event */ 1024 1025