1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) 8 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 9 * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk) 10 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org) 11 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) 12 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) 13 * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl) 14 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) 15 */ 16 #include <linux/capability.h> 17 #include <linux/module.h> 18 #include <linux/errno.h> 19 #include <linux/types.h> 20 #include <linux/socket.h> 21 #include <linux/in.h> 22 #include <linux/kernel.h> 23 #include <linux/sched.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/slab.h> 29 #include <net/ax25.h> 30 #include <linux/inet.h> 31 #include <linux/netdevice.h> 32 #include <linux/if_arp.h> 33 #include <linux/skbuff.h> 34 #include <net/sock.h> 35 #include <asm/uaccess.h> 36 #include <linux/fcntl.h> 37 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 38 #include <linux/mm.h> 39 #include <linux/interrupt.h> 40 #include <linux/notifier.h> 41 #include <linux/proc_fs.h> 42 #include <linux/stat.h> 43 #include <linux/sysctl.h> 44 #include <linux/init.h> 45 #include <linux/spinlock.h> 46 #include <net/net_namespace.h> 47 #include <net/tcp_states.h> 48 #include <net/ip.h> 49 #include <net/arp.h> 50 51 52 53 HLIST_HEAD(ax25_list); 54 DEFINE_SPINLOCK(ax25_list_lock); 55 56 static const struct proto_ops ax25_proto_ops; 57 58 static void ax25_free_sock(struct sock *sk) 59 { 60 ax25_cb_put(sk_to_ax25(sk)); 61 } 62 63 /* 64 * Socket removal during an interrupt is now safe. 65 */ 66 static void ax25_cb_del(ax25_cb *ax25) 67 { 68 if (!hlist_unhashed(&ax25->ax25_node)) { 69 spin_lock_bh(&ax25_list_lock); 70 hlist_del_init(&ax25->ax25_node); 71 spin_unlock_bh(&ax25_list_lock); 72 ax25_cb_put(ax25); 73 } 74 } 75 76 /* 77 * Kill all bound sockets on a dropped device. 78 */ 79 static void ax25_kill_by_device(struct net_device *dev) 80 { 81 ax25_dev *ax25_dev; 82 ax25_cb *s; 83 84 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 85 return; 86 87 spin_lock_bh(&ax25_list_lock); 88 again: 89 ax25_for_each(s, &ax25_list) { 90 if (s->ax25_dev == ax25_dev) { 91 s->ax25_dev = NULL; 92 spin_unlock_bh(&ax25_list_lock); 93 ax25_disconnect(s, ENETUNREACH); 94 spin_lock_bh(&ax25_list_lock); 95 96 /* The entry could have been deleted from the 97 * list meanwhile and thus the next pointer is 98 * no longer valid. Play it safe and restart 99 * the scan. Forward progress is ensured 100 * because we set s->ax25_dev to NULL and we 101 * are never passed a NULL 'dev' argument. 102 */ 103 goto again; 104 } 105 } 106 spin_unlock_bh(&ax25_list_lock); 107 } 108 109 /* 110 * Handle device status changes. 111 */ 112 static int ax25_device_event(struct notifier_block *this, unsigned long event, 113 void *ptr) 114 { 115 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 116 117 if (!net_eq(dev_net(dev), &init_net)) 118 return NOTIFY_DONE; 119 120 /* Reject non AX.25 devices */ 121 if (dev->type != ARPHRD_AX25) 122 return NOTIFY_DONE; 123 124 switch (event) { 125 case NETDEV_UP: 126 ax25_dev_device_up(dev); 127 break; 128 case NETDEV_DOWN: 129 ax25_kill_by_device(dev); 130 ax25_rt_device_down(dev); 131 ax25_dev_device_down(dev); 132 break; 133 default: 134 break; 135 } 136 137 return NOTIFY_DONE; 138 } 139 140 /* 141 * Add a socket to the bound sockets list. 142 */ 143 void ax25_cb_add(ax25_cb *ax25) 144 { 145 spin_lock_bh(&ax25_list_lock); 146 ax25_cb_hold(ax25); 147 hlist_add_head(&ax25->ax25_node, &ax25_list); 148 spin_unlock_bh(&ax25_list_lock); 149 } 150 151 /* 152 * Find a socket that wants to accept the SABM we have just 153 * received. 154 */ 155 struct sock *ax25_find_listener(ax25_address *addr, int digi, 156 struct net_device *dev, int type) 157 { 158 ax25_cb *s; 159 160 spin_lock(&ax25_list_lock); 161 ax25_for_each(s, &ax25_list) { 162 if ((s->iamdigi && !digi) || (!s->iamdigi && digi)) 163 continue; 164 if (s->sk && !ax25cmp(&s->source_addr, addr) && 165 s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) { 166 /* If device is null we match any device */ 167 if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) { 168 sock_hold(s->sk); 169 spin_unlock(&ax25_list_lock); 170 return s->sk; 171 } 172 } 173 } 174 spin_unlock(&ax25_list_lock); 175 176 return NULL; 177 } 178 179 /* 180 * Find an AX.25 socket given both ends. 181 */ 182 struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr, 183 int type) 184 { 185 struct sock *sk = NULL; 186 ax25_cb *s; 187 188 spin_lock(&ax25_list_lock); 189 ax25_for_each(s, &ax25_list) { 190 if (s->sk && !ax25cmp(&s->source_addr, my_addr) && 191 !ax25cmp(&s->dest_addr, dest_addr) && 192 s->sk->sk_type == type) { 193 sk = s->sk; 194 sock_hold(sk); 195 break; 196 } 197 } 198 199 spin_unlock(&ax25_list_lock); 200 201 return sk; 202 } 203 204 /* 205 * Find an AX.25 control block given both ends. It will only pick up 206 * floating AX.25 control blocks or non Raw socket bound control blocks. 207 */ 208 ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr, 209 ax25_digi *digi, struct net_device *dev) 210 { 211 ax25_cb *s; 212 213 spin_lock_bh(&ax25_list_lock); 214 ax25_for_each(s, &ax25_list) { 215 if (s->sk && s->sk->sk_type != SOCK_SEQPACKET) 216 continue; 217 if (s->ax25_dev == NULL) 218 continue; 219 if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) { 220 if (digi != NULL && digi->ndigi != 0) { 221 if (s->digipeat == NULL) 222 continue; 223 if (ax25digicmp(s->digipeat, digi) != 0) 224 continue; 225 } else { 226 if (s->digipeat != NULL && s->digipeat->ndigi != 0) 227 continue; 228 } 229 ax25_cb_hold(s); 230 spin_unlock_bh(&ax25_list_lock); 231 232 return s; 233 } 234 } 235 spin_unlock_bh(&ax25_list_lock); 236 237 return NULL; 238 } 239 240 EXPORT_SYMBOL(ax25_find_cb); 241 242 void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto) 243 { 244 ax25_cb *s; 245 struct sk_buff *copy; 246 247 spin_lock(&ax25_list_lock); 248 ax25_for_each(s, &ax25_list) { 249 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && 250 s->sk->sk_type == SOCK_RAW && 251 s->sk->sk_protocol == proto && 252 s->ax25_dev->dev == skb->dev && 253 atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) { 254 if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL) 255 continue; 256 if (sock_queue_rcv_skb(s->sk, copy) != 0) 257 kfree_skb(copy); 258 } 259 } 260 spin_unlock(&ax25_list_lock); 261 } 262 263 /* 264 * Deferred destroy. 265 */ 266 void ax25_destroy_socket(ax25_cb *); 267 268 /* 269 * Handler for deferred kills. 270 */ 271 static void ax25_destroy_timer(unsigned long data) 272 { 273 ax25_cb *ax25=(ax25_cb *)data; 274 struct sock *sk; 275 276 sk=ax25->sk; 277 278 bh_lock_sock(sk); 279 sock_hold(sk); 280 ax25_destroy_socket(ax25); 281 bh_unlock_sock(sk); 282 sock_put(sk); 283 } 284 285 /* 286 * This is called from user mode and the timers. Thus it protects itself 287 * against interrupt users but doesn't worry about being called during 288 * work. Once it is removed from the queue no interrupt or bottom half 289 * will touch it and we are (fairly 8-) ) safe. 290 */ 291 void ax25_destroy_socket(ax25_cb *ax25) 292 { 293 struct sk_buff *skb; 294 295 ax25_cb_del(ax25); 296 297 ax25_stop_heartbeat(ax25); 298 ax25_stop_t1timer(ax25); 299 ax25_stop_t2timer(ax25); 300 ax25_stop_t3timer(ax25); 301 ax25_stop_idletimer(ax25); 302 303 ax25_clear_queues(ax25); /* Flush the queues */ 304 305 if (ax25->sk != NULL) { 306 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) { 307 if (skb->sk != ax25->sk) { 308 /* A pending connection */ 309 ax25_cb *sax25 = sk_to_ax25(skb->sk); 310 311 /* Queue the unaccepted socket for death */ 312 sock_orphan(skb->sk); 313 314 /* 9A4GL: hack to release unaccepted sockets */ 315 skb->sk->sk_state = TCP_LISTEN; 316 317 ax25_start_heartbeat(sax25); 318 sax25->state = AX25_STATE_0; 319 } 320 321 kfree_skb(skb); 322 } 323 skb_queue_purge(&ax25->sk->sk_write_queue); 324 } 325 326 if (ax25->sk != NULL) { 327 if (sk_has_allocations(ax25->sk)) { 328 /* Defer: outstanding buffers */ 329 setup_timer(&ax25->dtimer, ax25_destroy_timer, 330 (unsigned long)ax25); 331 ax25->dtimer.expires = jiffies + 2 * HZ; 332 add_timer(&ax25->dtimer); 333 } else { 334 struct sock *sk=ax25->sk; 335 ax25->sk=NULL; 336 sock_put(sk); 337 } 338 } else { 339 ax25_cb_put(ax25); 340 } 341 } 342 343 /* 344 * dl1bke 960311: set parameters for existing AX.25 connections, 345 * includes a KILL command to abort any connection. 346 * VERY useful for debugging ;-) 347 */ 348 static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) 349 { 350 struct ax25_ctl_struct ax25_ctl; 351 ax25_digi digi; 352 ax25_dev *ax25_dev; 353 ax25_cb *ax25; 354 unsigned int k; 355 int ret = 0; 356 357 if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl))) 358 return -EFAULT; 359 360 if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL) 361 return -ENODEV; 362 363 if (ax25_ctl.digi_count > AX25_MAX_DIGIS) 364 return -EINVAL; 365 366 if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL) 367 return -EINVAL; 368 369 digi.ndigi = ax25_ctl.digi_count; 370 for (k = 0; k < digi.ndigi; k++) 371 digi.calls[k] = ax25_ctl.digi_addr[k]; 372 373 if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL) 374 return -ENOTCONN; 375 376 switch (ax25_ctl.cmd) { 377 case AX25_KILL: 378 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); 379 #ifdef CONFIG_AX25_DAMA_SLAVE 380 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE) 381 ax25_dama_off(ax25); 382 #endif 383 ax25_disconnect(ax25, ENETRESET); 384 break; 385 386 case AX25_WINDOW: 387 if (ax25->modulus == AX25_MODULUS) { 388 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7) 389 goto einval_put; 390 } else { 391 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63) 392 goto einval_put; 393 } 394 ax25->window = ax25_ctl.arg; 395 break; 396 397 case AX25_T1: 398 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) 399 goto einval_put; 400 ax25->rtt = (ax25_ctl.arg * HZ) / 2; 401 ax25->t1 = ax25_ctl.arg * HZ; 402 break; 403 404 case AX25_T2: 405 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) 406 goto einval_put; 407 ax25->t2 = ax25_ctl.arg * HZ; 408 break; 409 410 case AX25_N2: 411 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31) 412 goto einval_put; 413 ax25->n2count = 0; 414 ax25->n2 = ax25_ctl.arg; 415 break; 416 417 case AX25_T3: 418 if (ax25_ctl.arg > ULONG_MAX / HZ) 419 goto einval_put; 420 ax25->t3 = ax25_ctl.arg * HZ; 421 break; 422 423 case AX25_IDLE: 424 if (ax25_ctl.arg > ULONG_MAX / (60 * HZ)) 425 goto einval_put; 426 427 ax25->idle = ax25_ctl.arg * 60 * HZ; 428 break; 429 430 case AX25_PACLEN: 431 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535) 432 goto einval_put; 433 ax25->paclen = ax25_ctl.arg; 434 break; 435 436 default: 437 goto einval_put; 438 } 439 440 out_put: 441 ax25_cb_put(ax25); 442 return ret; 443 444 einval_put: 445 ret = -EINVAL; 446 goto out_put; 447 } 448 449 static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev) 450 { 451 ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2; 452 ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]); 453 ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]); 454 ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]); 455 ax25->n2 = ax25_dev->values[AX25_VALUES_N2]; 456 ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN]; 457 ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]); 458 ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF]; 459 460 if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) { 461 ax25->modulus = AX25_EMODULUS; 462 ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW]; 463 } else { 464 ax25->modulus = AX25_MODULUS; 465 ax25->window = ax25_dev->values[AX25_VALUES_WINDOW]; 466 } 467 } 468 469 /* 470 * Fill in a created AX.25 created control block with the default 471 * values for a particular device. 472 */ 473 void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev) 474 { 475 ax25->ax25_dev = ax25_dev; 476 477 if (ax25->ax25_dev != NULL) { 478 ax25_fillin_cb_from_dev(ax25, ax25_dev); 479 return; 480 } 481 482 /* 483 * No device, use kernel / AX.25 spec default values 484 */ 485 ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2; 486 ax25->t1 = msecs_to_jiffies(AX25_DEF_T1); 487 ax25->t2 = msecs_to_jiffies(AX25_DEF_T2); 488 ax25->t3 = msecs_to_jiffies(AX25_DEF_T3); 489 ax25->n2 = AX25_DEF_N2; 490 ax25->paclen = AX25_DEF_PACLEN; 491 ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE); 492 ax25->backoff = AX25_DEF_BACKOFF; 493 494 if (AX25_DEF_AXDEFMODE) { 495 ax25->modulus = AX25_EMODULUS; 496 ax25->window = AX25_DEF_EWINDOW; 497 } else { 498 ax25->modulus = AX25_MODULUS; 499 ax25->window = AX25_DEF_WINDOW; 500 } 501 } 502 503 /* 504 * Create an empty AX.25 control block. 505 */ 506 ax25_cb *ax25_create_cb(void) 507 { 508 ax25_cb *ax25; 509 510 if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL) 511 return NULL; 512 513 atomic_set(&ax25->refcount, 1); 514 515 skb_queue_head_init(&ax25->write_queue); 516 skb_queue_head_init(&ax25->frag_queue); 517 skb_queue_head_init(&ax25->ack_queue); 518 skb_queue_head_init(&ax25->reseq_queue); 519 520 ax25_setup_timers(ax25); 521 522 ax25_fillin_cb(ax25, NULL); 523 524 ax25->state = AX25_STATE_0; 525 526 return ax25; 527 } 528 529 /* 530 * Handling for system calls applied via the various interfaces to an 531 * AX25 socket object 532 */ 533 534 static int ax25_setsockopt(struct socket *sock, int level, int optname, 535 char __user *optval, unsigned int optlen) 536 { 537 struct sock *sk = sock->sk; 538 ax25_cb *ax25; 539 struct net_device *dev; 540 char devname[IFNAMSIZ]; 541 unsigned long opt; 542 int res = 0; 543 544 if (level != SOL_AX25) 545 return -ENOPROTOOPT; 546 547 if (optlen < sizeof(unsigned int)) 548 return -EINVAL; 549 550 if (get_user(opt, (unsigned int __user *)optval)) 551 return -EFAULT; 552 553 lock_sock(sk); 554 ax25 = sk_to_ax25(sk); 555 556 switch (optname) { 557 case AX25_WINDOW: 558 if (ax25->modulus == AX25_MODULUS) { 559 if (opt < 1 || opt > 7) { 560 res = -EINVAL; 561 break; 562 } 563 } else { 564 if (opt < 1 || opt > 63) { 565 res = -EINVAL; 566 break; 567 } 568 } 569 ax25->window = opt; 570 break; 571 572 case AX25_T1: 573 if (opt < 1 || opt > ULONG_MAX / HZ) { 574 res = -EINVAL; 575 break; 576 } 577 ax25->rtt = (opt * HZ) >> 1; 578 ax25->t1 = opt * HZ; 579 break; 580 581 case AX25_T2: 582 if (opt < 1 || opt > ULONG_MAX / HZ) { 583 res = -EINVAL; 584 break; 585 } 586 ax25->t2 = opt * HZ; 587 break; 588 589 case AX25_N2: 590 if (opt < 1 || opt > 31) { 591 res = -EINVAL; 592 break; 593 } 594 ax25->n2 = opt; 595 break; 596 597 case AX25_T3: 598 if (opt < 1 || opt > ULONG_MAX / HZ) { 599 res = -EINVAL; 600 break; 601 } 602 ax25->t3 = opt * HZ; 603 break; 604 605 case AX25_IDLE: 606 if (opt > ULONG_MAX / (60 * HZ)) { 607 res = -EINVAL; 608 break; 609 } 610 ax25->idle = opt * 60 * HZ; 611 break; 612 613 case AX25_BACKOFF: 614 if (opt > 2) { 615 res = -EINVAL; 616 break; 617 } 618 ax25->backoff = opt; 619 break; 620 621 case AX25_EXTSEQ: 622 ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS; 623 break; 624 625 case AX25_PIDINCL: 626 ax25->pidincl = opt ? 1 : 0; 627 break; 628 629 case AX25_IAMDIGI: 630 ax25->iamdigi = opt ? 1 : 0; 631 break; 632 633 case AX25_PACLEN: 634 if (opt < 16 || opt > 65535) { 635 res = -EINVAL; 636 break; 637 } 638 ax25->paclen = opt; 639 break; 640 641 case SO_BINDTODEVICE: 642 if (optlen > IFNAMSIZ) 643 optlen = IFNAMSIZ; 644 645 if (copy_from_user(devname, optval, optlen)) { 646 res = -EFAULT; 647 break; 648 } 649 650 if (sk->sk_type == SOCK_SEQPACKET && 651 (sock->state != SS_UNCONNECTED || 652 sk->sk_state == TCP_LISTEN)) { 653 res = -EADDRNOTAVAIL; 654 break; 655 } 656 657 dev = dev_get_by_name(&init_net, devname); 658 if (!dev) { 659 res = -ENODEV; 660 break; 661 } 662 663 ax25->ax25_dev = ax25_dev_ax25dev(dev); 664 ax25_fillin_cb(ax25, ax25->ax25_dev); 665 dev_put(dev); 666 break; 667 668 default: 669 res = -ENOPROTOOPT; 670 } 671 release_sock(sk); 672 673 return res; 674 } 675 676 static int ax25_getsockopt(struct socket *sock, int level, int optname, 677 char __user *optval, int __user *optlen) 678 { 679 struct sock *sk = sock->sk; 680 ax25_cb *ax25; 681 struct ax25_dev *ax25_dev; 682 char devname[IFNAMSIZ]; 683 void *valptr; 684 int val = 0; 685 int maxlen, length; 686 687 if (level != SOL_AX25) 688 return -ENOPROTOOPT; 689 690 if (get_user(maxlen, optlen)) 691 return -EFAULT; 692 693 if (maxlen < 1) 694 return -EFAULT; 695 696 valptr = (void *) &val; 697 length = min_t(unsigned int, maxlen, sizeof(int)); 698 699 lock_sock(sk); 700 ax25 = sk_to_ax25(sk); 701 702 switch (optname) { 703 case AX25_WINDOW: 704 val = ax25->window; 705 break; 706 707 case AX25_T1: 708 val = ax25->t1 / HZ; 709 break; 710 711 case AX25_T2: 712 val = ax25->t2 / HZ; 713 break; 714 715 case AX25_N2: 716 val = ax25->n2; 717 break; 718 719 case AX25_T3: 720 val = ax25->t3 / HZ; 721 break; 722 723 case AX25_IDLE: 724 val = ax25->idle / (60 * HZ); 725 break; 726 727 case AX25_BACKOFF: 728 val = ax25->backoff; 729 break; 730 731 case AX25_EXTSEQ: 732 val = (ax25->modulus == AX25_EMODULUS); 733 break; 734 735 case AX25_PIDINCL: 736 val = ax25->pidincl; 737 break; 738 739 case AX25_IAMDIGI: 740 val = ax25->iamdigi; 741 break; 742 743 case AX25_PACLEN: 744 val = ax25->paclen; 745 break; 746 747 case SO_BINDTODEVICE: 748 ax25_dev = ax25->ax25_dev; 749 750 if (ax25_dev != NULL && ax25_dev->dev != NULL) { 751 strlcpy(devname, ax25_dev->dev->name, sizeof(devname)); 752 length = strlen(devname) + 1; 753 } else { 754 *devname = '\0'; 755 length = 1; 756 } 757 758 valptr = (void *) devname; 759 break; 760 761 default: 762 release_sock(sk); 763 return -ENOPROTOOPT; 764 } 765 release_sock(sk); 766 767 if (put_user(length, optlen)) 768 return -EFAULT; 769 770 return copy_to_user(optval, valptr, length) ? -EFAULT : 0; 771 } 772 773 static int ax25_listen(struct socket *sock, int backlog) 774 { 775 struct sock *sk = sock->sk; 776 int res = 0; 777 778 lock_sock(sk); 779 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) { 780 sk->sk_max_ack_backlog = backlog; 781 sk->sk_state = TCP_LISTEN; 782 goto out; 783 } 784 res = -EOPNOTSUPP; 785 786 out: 787 release_sock(sk); 788 789 return res; 790 } 791 792 /* 793 * XXX: when creating ax25_sock we should update the .obj_size setting 794 * below. 795 */ 796 static struct proto ax25_proto = { 797 .name = "AX25", 798 .owner = THIS_MODULE, 799 .obj_size = sizeof(struct ax25_sock), 800 }; 801 802 static int ax25_create(struct net *net, struct socket *sock, int protocol, 803 int kern) 804 { 805 struct sock *sk; 806 ax25_cb *ax25; 807 808 if (protocol < 0 || protocol > SK_PROTOCOL_MAX) 809 return -EINVAL; 810 811 if (!net_eq(net, &init_net)) 812 return -EAFNOSUPPORT; 813 814 switch (sock->type) { 815 case SOCK_DGRAM: 816 if (protocol == 0 || protocol == PF_AX25) 817 protocol = AX25_P_TEXT; 818 break; 819 820 case SOCK_SEQPACKET: 821 switch (protocol) { 822 case 0: 823 case PF_AX25: /* For CLX */ 824 protocol = AX25_P_TEXT; 825 break; 826 case AX25_P_SEGMENT: 827 #ifdef CONFIG_INET 828 case AX25_P_ARP: 829 case AX25_P_IP: 830 #endif 831 #ifdef CONFIG_NETROM 832 case AX25_P_NETROM: 833 #endif 834 #ifdef CONFIG_ROSE 835 case AX25_P_ROSE: 836 #endif 837 return -ESOCKTNOSUPPORT; 838 #ifdef CONFIG_NETROM_MODULE 839 case AX25_P_NETROM: 840 if (ax25_protocol_is_registered(AX25_P_NETROM)) 841 return -ESOCKTNOSUPPORT; 842 break; 843 #endif 844 #ifdef CONFIG_ROSE_MODULE 845 case AX25_P_ROSE: 846 if (ax25_protocol_is_registered(AX25_P_ROSE)) 847 return -ESOCKTNOSUPPORT; 848 #endif 849 default: 850 break; 851 } 852 break; 853 854 case SOCK_RAW: 855 break; 856 default: 857 return -ESOCKTNOSUPPORT; 858 } 859 860 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern); 861 if (sk == NULL) 862 return -ENOMEM; 863 864 ax25 = ax25_sk(sk)->cb = ax25_create_cb(); 865 if (!ax25) { 866 sk_free(sk); 867 return -ENOMEM; 868 } 869 870 sock_init_data(sock, sk); 871 872 sk->sk_destruct = ax25_free_sock; 873 sock->ops = &ax25_proto_ops; 874 sk->sk_protocol = protocol; 875 876 ax25->sk = sk; 877 878 return 0; 879 } 880 881 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev) 882 { 883 struct sock *sk; 884 ax25_cb *ax25, *oax25; 885 886 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0); 887 if (sk == NULL) 888 return NULL; 889 890 if ((ax25 = ax25_create_cb()) == NULL) { 891 sk_free(sk); 892 return NULL; 893 } 894 895 switch (osk->sk_type) { 896 case SOCK_DGRAM: 897 break; 898 case SOCK_SEQPACKET: 899 break; 900 default: 901 sk_free(sk); 902 ax25_cb_put(ax25); 903 return NULL; 904 } 905 906 sock_init_data(NULL, sk); 907 908 sk->sk_type = osk->sk_type; 909 sk->sk_priority = osk->sk_priority; 910 sk->sk_protocol = osk->sk_protocol; 911 sk->sk_rcvbuf = osk->sk_rcvbuf; 912 sk->sk_sndbuf = osk->sk_sndbuf; 913 sk->sk_state = TCP_ESTABLISHED; 914 sock_copy_flags(sk, osk); 915 916 oax25 = sk_to_ax25(osk); 917 918 ax25->modulus = oax25->modulus; 919 ax25->backoff = oax25->backoff; 920 ax25->pidincl = oax25->pidincl; 921 ax25->iamdigi = oax25->iamdigi; 922 ax25->rtt = oax25->rtt; 923 ax25->t1 = oax25->t1; 924 ax25->t2 = oax25->t2; 925 ax25->t3 = oax25->t3; 926 ax25->n2 = oax25->n2; 927 ax25->idle = oax25->idle; 928 ax25->paclen = oax25->paclen; 929 ax25->window = oax25->window; 930 931 ax25->ax25_dev = ax25_dev; 932 ax25->source_addr = oax25->source_addr; 933 934 if (oax25->digipeat != NULL) { 935 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi), 936 GFP_ATOMIC); 937 if (ax25->digipeat == NULL) { 938 sk_free(sk); 939 ax25_cb_put(ax25); 940 return NULL; 941 } 942 } 943 944 ax25_sk(sk)->cb = ax25; 945 sk->sk_destruct = ax25_free_sock; 946 ax25->sk = sk; 947 948 return sk; 949 } 950 951 static int ax25_release(struct socket *sock) 952 { 953 struct sock *sk = sock->sk; 954 ax25_cb *ax25; 955 956 if (sk == NULL) 957 return 0; 958 959 sock_hold(sk); 960 sock_orphan(sk); 961 lock_sock(sk); 962 ax25 = sk_to_ax25(sk); 963 964 if (sk->sk_type == SOCK_SEQPACKET) { 965 switch (ax25->state) { 966 case AX25_STATE_0: 967 release_sock(sk); 968 ax25_disconnect(ax25, 0); 969 lock_sock(sk); 970 ax25_destroy_socket(ax25); 971 break; 972 973 case AX25_STATE_1: 974 case AX25_STATE_2: 975 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); 976 release_sock(sk); 977 ax25_disconnect(ax25, 0); 978 lock_sock(sk); 979 ax25_destroy_socket(ax25); 980 break; 981 982 case AX25_STATE_3: 983 case AX25_STATE_4: 984 ax25_clear_queues(ax25); 985 ax25->n2count = 0; 986 987 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { 988 case AX25_PROTO_STD_SIMPLEX: 989 case AX25_PROTO_STD_DUPLEX: 990 ax25_send_control(ax25, 991 AX25_DISC, 992 AX25_POLLON, 993 AX25_COMMAND); 994 ax25_stop_t2timer(ax25); 995 ax25_stop_t3timer(ax25); 996 ax25_stop_idletimer(ax25); 997 break; 998 #ifdef CONFIG_AX25_DAMA_SLAVE 999 case AX25_PROTO_DAMA_SLAVE: 1000 ax25_stop_t3timer(ax25); 1001 ax25_stop_idletimer(ax25); 1002 break; 1003 #endif 1004 } 1005 ax25_calculate_t1(ax25); 1006 ax25_start_t1timer(ax25); 1007 ax25->state = AX25_STATE_2; 1008 sk->sk_state = TCP_CLOSE; 1009 sk->sk_shutdown |= SEND_SHUTDOWN; 1010 sk->sk_state_change(sk); 1011 sock_set_flag(sk, SOCK_DESTROY); 1012 break; 1013 1014 default: 1015 break; 1016 } 1017 } else { 1018 sk->sk_state = TCP_CLOSE; 1019 sk->sk_shutdown |= SEND_SHUTDOWN; 1020 sk->sk_state_change(sk); 1021 ax25_destroy_socket(ax25); 1022 } 1023 1024 sock->sk = NULL; 1025 release_sock(sk); 1026 sock_put(sk); 1027 1028 return 0; 1029 } 1030 1031 /* 1032 * We support a funny extension here so you can (as root) give any callsign 1033 * digipeated via a local address as source. This hack is obsolete now 1034 * that we've implemented support for SO_BINDTODEVICE. It is however small 1035 * and trivially backward compatible. 1036 */ 1037 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 1038 { 1039 struct sock *sk = sock->sk; 1040 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 1041 ax25_dev *ax25_dev = NULL; 1042 ax25_uid_assoc *user; 1043 ax25_address call; 1044 ax25_cb *ax25; 1045 int err = 0; 1046 1047 if (addr_len != sizeof(struct sockaddr_ax25) && 1048 addr_len != sizeof(struct full_sockaddr_ax25)) 1049 /* support for old structure may go away some time 1050 * ax25_bind(): uses old (6 digipeater) socket structure. 1051 */ 1052 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || 1053 (addr_len > sizeof(struct full_sockaddr_ax25))) 1054 return -EINVAL; 1055 1056 if (addr->fsa_ax25.sax25_family != AF_AX25) 1057 return -EINVAL; 1058 1059 user = ax25_findbyuid(current_euid()); 1060 if (user) { 1061 call = user->call; 1062 ax25_uid_put(user); 1063 } else { 1064 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) 1065 return -EACCES; 1066 1067 call = addr->fsa_ax25.sax25_call; 1068 } 1069 1070 lock_sock(sk); 1071 1072 ax25 = sk_to_ax25(sk); 1073 if (!sock_flag(sk, SOCK_ZAPPED)) { 1074 err = -EINVAL; 1075 goto out; 1076 } 1077 1078 ax25->source_addr = call; 1079 1080 /* 1081 * User already set interface with SO_BINDTODEVICE 1082 */ 1083 if (ax25->ax25_dev != NULL) 1084 goto done; 1085 1086 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) { 1087 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 && 1088 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) { 1089 err = -EADDRNOTAVAIL; 1090 goto out; 1091 } 1092 } else { 1093 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) { 1094 err = -EADDRNOTAVAIL; 1095 goto out; 1096 } 1097 } 1098 1099 if (ax25_dev != NULL) 1100 ax25_fillin_cb(ax25, ax25_dev); 1101 1102 done: 1103 ax25_cb_add(ax25); 1104 sock_reset_flag(sk, SOCK_ZAPPED); 1105 1106 out: 1107 release_sock(sk); 1108 1109 return err; 1110 } 1111 1112 /* 1113 * FIXME: nonblock behaviour looks like it may have a bug. 1114 */ 1115 static int __must_check ax25_connect(struct socket *sock, 1116 struct sockaddr *uaddr, int addr_len, int flags) 1117 { 1118 struct sock *sk = sock->sk; 1119 ax25_cb *ax25 = sk_to_ax25(sk), *ax25t; 1120 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; 1121 ax25_digi *digi = NULL; 1122 int ct = 0, err = 0; 1123 1124 /* 1125 * some sanity checks. code further down depends on this 1126 */ 1127 1128 if (addr_len == sizeof(struct sockaddr_ax25)) 1129 /* support for this will go away in early 2.5.x 1130 * ax25_connect(): uses obsolete socket structure 1131 */ 1132 ; 1133 else if (addr_len != sizeof(struct full_sockaddr_ax25)) 1134 /* support for old structure may go away some time 1135 * ax25_connect(): uses old (6 digipeater) socket structure. 1136 */ 1137 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || 1138 (addr_len > sizeof(struct full_sockaddr_ax25))) 1139 return -EINVAL; 1140 1141 1142 if (fsa->fsa_ax25.sax25_family != AF_AX25) 1143 return -EINVAL; 1144 1145 lock_sock(sk); 1146 1147 /* deal with restarts */ 1148 if (sock->state == SS_CONNECTING) { 1149 switch (sk->sk_state) { 1150 case TCP_SYN_SENT: /* still trying */ 1151 err = -EINPROGRESS; 1152 goto out_release; 1153 1154 case TCP_ESTABLISHED: /* connection established */ 1155 sock->state = SS_CONNECTED; 1156 goto out_release; 1157 1158 case TCP_CLOSE: /* connection refused */ 1159 sock->state = SS_UNCONNECTED; 1160 err = -ECONNREFUSED; 1161 goto out_release; 1162 } 1163 } 1164 1165 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) { 1166 err = -EISCONN; /* No reconnect on a seqpacket socket */ 1167 goto out_release; 1168 } 1169 1170 sk->sk_state = TCP_CLOSE; 1171 sock->state = SS_UNCONNECTED; 1172 1173 kfree(ax25->digipeat); 1174 ax25->digipeat = NULL; 1175 1176 /* 1177 * Handle digi-peaters to be used. 1178 */ 1179 if (addr_len > sizeof(struct sockaddr_ax25) && 1180 fsa->fsa_ax25.sax25_ndigis != 0) { 1181 /* Valid number of digipeaters ? */ 1182 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) { 1183 err = -EINVAL; 1184 goto out_release; 1185 } 1186 1187 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) { 1188 err = -ENOBUFS; 1189 goto out_release; 1190 } 1191 1192 digi->ndigi = fsa->fsa_ax25.sax25_ndigis; 1193 digi->lastrepeat = -1; 1194 1195 while (ct < fsa->fsa_ax25.sax25_ndigis) { 1196 if ((fsa->fsa_digipeater[ct].ax25_call[6] & 1197 AX25_HBIT) && ax25->iamdigi) { 1198 digi->repeated[ct] = 1; 1199 digi->lastrepeat = ct; 1200 } else { 1201 digi->repeated[ct] = 0; 1202 } 1203 digi->calls[ct] = fsa->fsa_digipeater[ct]; 1204 ct++; 1205 } 1206 } 1207 1208 /* 1209 * Must bind first - autobinding in this may or may not work. If 1210 * the socket is already bound, check to see if the device has 1211 * been filled in, error if it hasn't. 1212 */ 1213 if (sock_flag(sk, SOCK_ZAPPED)) { 1214 /* check if we can remove this feature. It is broken. */ 1215 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n", 1216 current->comm); 1217 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) { 1218 kfree(digi); 1219 goto out_release; 1220 } 1221 1222 ax25_fillin_cb(ax25, ax25->ax25_dev); 1223 ax25_cb_add(ax25); 1224 } else { 1225 if (ax25->ax25_dev == NULL) { 1226 kfree(digi); 1227 err = -EHOSTUNREACH; 1228 goto out_release; 1229 } 1230 } 1231 1232 if (sk->sk_type == SOCK_SEQPACKET && 1233 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi, 1234 ax25->ax25_dev->dev))) { 1235 kfree(digi); 1236 err = -EADDRINUSE; /* Already such a connection */ 1237 ax25_cb_put(ax25t); 1238 goto out_release; 1239 } 1240 1241 ax25->dest_addr = fsa->fsa_ax25.sax25_call; 1242 ax25->digipeat = digi; 1243 1244 /* First the easy one */ 1245 if (sk->sk_type != SOCK_SEQPACKET) { 1246 sock->state = SS_CONNECTED; 1247 sk->sk_state = TCP_ESTABLISHED; 1248 goto out_release; 1249 } 1250 1251 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */ 1252 sock->state = SS_CONNECTING; 1253 sk->sk_state = TCP_SYN_SENT; 1254 1255 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { 1256 case AX25_PROTO_STD_SIMPLEX: 1257 case AX25_PROTO_STD_DUPLEX: 1258 ax25_std_establish_data_link(ax25); 1259 break; 1260 1261 #ifdef CONFIG_AX25_DAMA_SLAVE 1262 case AX25_PROTO_DAMA_SLAVE: 1263 ax25->modulus = AX25_MODULUS; 1264 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; 1265 if (ax25->ax25_dev->dama.slave) 1266 ax25_ds_establish_data_link(ax25); 1267 else 1268 ax25_std_establish_data_link(ax25); 1269 break; 1270 #endif 1271 } 1272 1273 ax25->state = AX25_STATE_1; 1274 1275 ax25_start_heartbeat(ax25); 1276 1277 /* Now the loop */ 1278 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 1279 err = -EINPROGRESS; 1280 goto out_release; 1281 } 1282 1283 if (sk->sk_state == TCP_SYN_SENT) { 1284 DEFINE_WAIT(wait); 1285 1286 for (;;) { 1287 prepare_to_wait(sk_sleep(sk), &wait, 1288 TASK_INTERRUPTIBLE); 1289 if (sk->sk_state != TCP_SYN_SENT) 1290 break; 1291 if (!signal_pending(current)) { 1292 release_sock(sk); 1293 schedule(); 1294 lock_sock(sk); 1295 continue; 1296 } 1297 err = -ERESTARTSYS; 1298 break; 1299 } 1300 finish_wait(sk_sleep(sk), &wait); 1301 1302 if (err) 1303 goto out_release; 1304 } 1305 1306 if (sk->sk_state != TCP_ESTABLISHED) { 1307 /* Not in ABM, not in WAIT_UA -> failed */ 1308 sock->state = SS_UNCONNECTED; 1309 err = sock_error(sk); /* Always set at this point */ 1310 goto out_release; 1311 } 1312 1313 sock->state = SS_CONNECTED; 1314 1315 err = 0; 1316 out_release: 1317 release_sock(sk); 1318 1319 return err; 1320 } 1321 1322 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags) 1323 { 1324 struct sk_buff *skb; 1325 struct sock *newsk; 1326 DEFINE_WAIT(wait); 1327 struct sock *sk; 1328 int err = 0; 1329 1330 if (sock->state != SS_UNCONNECTED) 1331 return -EINVAL; 1332 1333 if ((sk = sock->sk) == NULL) 1334 return -EINVAL; 1335 1336 lock_sock(sk); 1337 if (sk->sk_type != SOCK_SEQPACKET) { 1338 err = -EOPNOTSUPP; 1339 goto out; 1340 } 1341 1342 if (sk->sk_state != TCP_LISTEN) { 1343 err = -EINVAL; 1344 goto out; 1345 } 1346 1347 /* 1348 * The read queue this time is holding sockets ready to use 1349 * hooked into the SABM we saved 1350 */ 1351 for (;;) { 1352 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1353 skb = skb_dequeue(&sk->sk_receive_queue); 1354 if (skb) 1355 break; 1356 1357 if (flags & O_NONBLOCK) { 1358 err = -EWOULDBLOCK; 1359 break; 1360 } 1361 if (!signal_pending(current)) { 1362 release_sock(sk); 1363 schedule(); 1364 lock_sock(sk); 1365 continue; 1366 } 1367 err = -ERESTARTSYS; 1368 break; 1369 } 1370 finish_wait(sk_sleep(sk), &wait); 1371 1372 if (err) 1373 goto out; 1374 1375 newsk = skb->sk; 1376 sock_graft(newsk, newsock); 1377 1378 /* Now attach up the new socket */ 1379 kfree_skb(skb); 1380 sk->sk_ack_backlog--; 1381 newsock->state = SS_CONNECTED; 1382 1383 out: 1384 release_sock(sk); 1385 1386 return err; 1387 } 1388 1389 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, 1390 int *uaddr_len, int peer) 1391 { 1392 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; 1393 struct sock *sk = sock->sk; 1394 unsigned char ndigi, i; 1395 ax25_cb *ax25; 1396 int err = 0; 1397 1398 memset(fsa, 0, sizeof(*fsa)); 1399 lock_sock(sk); 1400 ax25 = sk_to_ax25(sk); 1401 1402 if (peer != 0) { 1403 if (sk->sk_state != TCP_ESTABLISHED) { 1404 err = -ENOTCONN; 1405 goto out; 1406 } 1407 1408 fsa->fsa_ax25.sax25_family = AF_AX25; 1409 fsa->fsa_ax25.sax25_call = ax25->dest_addr; 1410 1411 if (ax25->digipeat != NULL) { 1412 ndigi = ax25->digipeat->ndigi; 1413 fsa->fsa_ax25.sax25_ndigis = ndigi; 1414 for (i = 0; i < ndigi; i++) 1415 fsa->fsa_digipeater[i] = 1416 ax25->digipeat->calls[i]; 1417 } 1418 } else { 1419 fsa->fsa_ax25.sax25_family = AF_AX25; 1420 fsa->fsa_ax25.sax25_call = ax25->source_addr; 1421 fsa->fsa_ax25.sax25_ndigis = 1; 1422 if (ax25->ax25_dev != NULL) { 1423 memcpy(&fsa->fsa_digipeater[0], 1424 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN); 1425 } else { 1426 fsa->fsa_digipeater[0] = null_ax25_address; 1427 } 1428 } 1429 *uaddr_len = sizeof (struct full_sockaddr_ax25); 1430 1431 out: 1432 release_sock(sk); 1433 1434 return err; 1435 } 1436 1437 static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1438 { 1439 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); 1440 struct sock *sk = sock->sk; 1441 struct sockaddr_ax25 sax; 1442 struct sk_buff *skb; 1443 ax25_digi dtmp, *dp; 1444 ax25_cb *ax25; 1445 size_t size; 1446 int lv, err, addr_len = msg->msg_namelen; 1447 1448 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1449 return -EINVAL; 1450 1451 lock_sock(sk); 1452 ax25 = sk_to_ax25(sk); 1453 1454 if (sock_flag(sk, SOCK_ZAPPED)) { 1455 err = -EADDRNOTAVAIL; 1456 goto out; 1457 } 1458 1459 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1460 send_sig(SIGPIPE, current, 0); 1461 err = -EPIPE; 1462 goto out; 1463 } 1464 1465 if (ax25->ax25_dev == NULL) { 1466 err = -ENETUNREACH; 1467 goto out; 1468 } 1469 1470 if (len > ax25->ax25_dev->dev->mtu) { 1471 err = -EMSGSIZE; 1472 goto out; 1473 } 1474 1475 if (usax != NULL) { 1476 if (usax->sax25_family != AF_AX25) { 1477 err = -EINVAL; 1478 goto out; 1479 } 1480 1481 if (addr_len == sizeof(struct sockaddr_ax25)) 1482 /* ax25_sendmsg(): uses obsolete socket structure */ 1483 ; 1484 else if (addr_len != sizeof(struct full_sockaddr_ax25)) 1485 /* support for old structure may go away some time 1486 * ax25_sendmsg(): uses old (6 digipeater) 1487 * socket structure. 1488 */ 1489 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || 1490 (addr_len > sizeof(struct full_sockaddr_ax25))) { 1491 err = -EINVAL; 1492 goto out; 1493 } 1494 1495 1496 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) { 1497 int ct = 0; 1498 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax; 1499 1500 /* Valid number of digipeaters ? */ 1501 if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) { 1502 err = -EINVAL; 1503 goto out; 1504 } 1505 1506 dtmp.ndigi = usax->sax25_ndigis; 1507 1508 while (ct < usax->sax25_ndigis) { 1509 dtmp.repeated[ct] = 0; 1510 dtmp.calls[ct] = fsa->fsa_digipeater[ct]; 1511 ct++; 1512 } 1513 1514 dtmp.lastrepeat = 0; 1515 } 1516 1517 sax = *usax; 1518 if (sk->sk_type == SOCK_SEQPACKET && 1519 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) { 1520 err = -EISCONN; 1521 goto out; 1522 } 1523 if (usax->sax25_ndigis == 0) 1524 dp = NULL; 1525 else 1526 dp = &dtmp; 1527 } else { 1528 /* 1529 * FIXME: 1003.1g - if the socket is like this because 1530 * it has become closed (not started closed) and is VC 1531 * we ought to SIGPIPE, EPIPE 1532 */ 1533 if (sk->sk_state != TCP_ESTABLISHED) { 1534 err = -ENOTCONN; 1535 goto out; 1536 } 1537 sax.sax25_family = AF_AX25; 1538 sax.sax25_call = ax25->dest_addr; 1539 dp = ax25->digipeat; 1540 } 1541 1542 /* Build a packet */ 1543 /* Assume the worst case */ 1544 size = len + ax25->ax25_dev->dev->hard_header_len; 1545 1546 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err); 1547 if (skb == NULL) 1548 goto out; 1549 1550 skb_reserve(skb, size - len); 1551 1552 /* User data follows immediately after the AX.25 data */ 1553 if (memcpy_from_msg(skb_put(skb, len), msg, len)) { 1554 err = -EFAULT; 1555 kfree_skb(skb); 1556 goto out; 1557 } 1558 1559 skb_reset_network_header(skb); 1560 1561 /* Add the PID if one is not supplied by the user in the skb */ 1562 if (!ax25->pidincl) 1563 *skb_push(skb, 1) = sk->sk_protocol; 1564 1565 if (sk->sk_type == SOCK_SEQPACKET) { 1566 /* Connected mode sockets go via the LAPB machine */ 1567 if (sk->sk_state != TCP_ESTABLISHED) { 1568 kfree_skb(skb); 1569 err = -ENOTCONN; 1570 goto out; 1571 } 1572 1573 /* Shove it onto the queue and kick */ 1574 ax25_output(ax25, ax25->paclen, skb); 1575 1576 err = len; 1577 goto out; 1578 } 1579 1580 skb_push(skb, 1 + ax25_addr_size(dp)); 1581 1582 /* Building AX.25 Header */ 1583 1584 /* Build an AX.25 header */ 1585 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call, 1586 dp, AX25_COMMAND, AX25_MODULUS); 1587 1588 skb_set_transport_header(skb, lv); 1589 1590 *skb_transport_header(skb) = AX25_UI; 1591 1592 /* Datagram frames go straight out of the door as UI */ 1593 ax25_queue_xmit(skb, ax25->ax25_dev->dev); 1594 1595 err = len; 1596 1597 out: 1598 release_sock(sk); 1599 1600 return err; 1601 } 1602 1603 static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1604 int flags) 1605 { 1606 struct sock *sk = sock->sk; 1607 struct sk_buff *skb; 1608 int copied; 1609 int err = 0; 1610 1611 lock_sock(sk); 1612 /* 1613 * This works for seqpacket too. The receiver has ordered the 1614 * queue for us! We do one quick check first though 1615 */ 1616 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) { 1617 err = -ENOTCONN; 1618 goto out; 1619 } 1620 1621 /* Now we can treat all alike */ 1622 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1623 flags & MSG_DONTWAIT, &err); 1624 if (skb == NULL) 1625 goto out; 1626 1627 if (!sk_to_ax25(sk)->pidincl) 1628 skb_pull(skb, 1); /* Remove PID */ 1629 1630 skb_reset_transport_header(skb); 1631 copied = skb->len; 1632 1633 if (copied > size) { 1634 copied = size; 1635 msg->msg_flags |= MSG_TRUNC; 1636 } 1637 1638 skb_copy_datagram_msg(skb, 0, msg, copied); 1639 1640 if (msg->msg_name) { 1641 ax25_digi digi; 1642 ax25_address src; 1643 const unsigned char *mac = skb_mac_header(skb); 1644 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); 1645 1646 memset(sax, 0, sizeof(struct full_sockaddr_ax25)); 1647 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL, 1648 &digi, NULL, NULL); 1649 sax->sax25_family = AF_AX25; 1650 /* We set this correctly, even though we may not let the 1651 application know the digi calls further down (because it 1652 did NOT ask to know them). This could get political... **/ 1653 sax->sax25_ndigis = digi.ndigi; 1654 sax->sax25_call = src; 1655 1656 if (sax->sax25_ndigis != 0) { 1657 int ct; 1658 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax; 1659 1660 for (ct = 0; ct < digi.ndigi; ct++) 1661 fsa->fsa_digipeater[ct] = digi.calls[ct]; 1662 } 1663 msg->msg_namelen = sizeof(struct full_sockaddr_ax25); 1664 } 1665 1666 skb_free_datagram(sk, skb); 1667 err = copied; 1668 1669 out: 1670 release_sock(sk); 1671 1672 return err; 1673 } 1674 1675 static int ax25_shutdown(struct socket *sk, int how) 1676 { 1677 /* FIXME - generate DM and RNR states */ 1678 return -EOPNOTSUPP; 1679 } 1680 1681 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1682 { 1683 struct sock *sk = sock->sk; 1684 void __user *argp = (void __user *)arg; 1685 int res = 0; 1686 1687 lock_sock(sk); 1688 switch (cmd) { 1689 case TIOCOUTQ: { 1690 long amount; 1691 1692 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1693 if (amount < 0) 1694 amount = 0; 1695 res = put_user(amount, (int __user *)argp); 1696 break; 1697 } 1698 1699 case TIOCINQ: { 1700 struct sk_buff *skb; 1701 long amount = 0L; 1702 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1703 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1704 amount = skb->len; 1705 res = put_user(amount, (int __user *) argp); 1706 break; 1707 } 1708 1709 case SIOCGSTAMP: 1710 res = sock_get_timestamp(sk, argp); 1711 break; 1712 1713 case SIOCGSTAMPNS: 1714 res = sock_get_timestampns(sk, argp); 1715 break; 1716 1717 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */ 1718 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */ 1719 case SIOCAX25GETUID: { 1720 struct sockaddr_ax25 sax25; 1721 if (copy_from_user(&sax25, argp, sizeof(sax25))) { 1722 res = -EFAULT; 1723 break; 1724 } 1725 res = ax25_uid_ioctl(cmd, &sax25); 1726 break; 1727 } 1728 1729 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */ 1730 long amount; 1731 if (!capable(CAP_NET_ADMIN)) { 1732 res = -EPERM; 1733 break; 1734 } 1735 if (get_user(amount, (long __user *)argp)) { 1736 res = -EFAULT; 1737 break; 1738 } 1739 if (amount < 0 || amount > AX25_NOUID_BLOCK) { 1740 res = -EINVAL; 1741 break; 1742 } 1743 ax25_uid_policy = amount; 1744 res = 0; 1745 break; 1746 } 1747 1748 case SIOCADDRT: 1749 case SIOCDELRT: 1750 case SIOCAX25OPTRT: 1751 if (!capable(CAP_NET_ADMIN)) { 1752 res = -EPERM; 1753 break; 1754 } 1755 res = ax25_rt_ioctl(cmd, argp); 1756 break; 1757 1758 case SIOCAX25CTLCON: 1759 if (!capable(CAP_NET_ADMIN)) { 1760 res = -EPERM; 1761 break; 1762 } 1763 res = ax25_ctl_ioctl(cmd, argp); 1764 break; 1765 1766 case SIOCAX25GETINFO: 1767 case SIOCAX25GETINFOOLD: { 1768 ax25_cb *ax25 = sk_to_ax25(sk); 1769 struct ax25_info_struct ax25_info; 1770 1771 ax25_info.t1 = ax25->t1 / HZ; 1772 ax25_info.t2 = ax25->t2 / HZ; 1773 ax25_info.t3 = ax25->t3 / HZ; 1774 ax25_info.idle = ax25->idle / (60 * HZ); 1775 ax25_info.n2 = ax25->n2; 1776 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ; 1777 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ; 1778 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ; 1779 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ); 1780 ax25_info.n2count = ax25->n2count; 1781 ax25_info.state = ax25->state; 1782 ax25_info.rcv_q = sk_rmem_alloc_get(sk); 1783 ax25_info.snd_q = sk_wmem_alloc_get(sk); 1784 ax25_info.vs = ax25->vs; 1785 ax25_info.vr = ax25->vr; 1786 ax25_info.va = ax25->va; 1787 ax25_info.vs_max = ax25->vs; /* reserved */ 1788 ax25_info.paclen = ax25->paclen; 1789 ax25_info.window = ax25->window; 1790 1791 /* old structure? */ 1792 if (cmd == SIOCAX25GETINFOOLD) { 1793 static int warned = 0; 1794 if (!warned) { 1795 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n", 1796 current->comm); 1797 warned=1; 1798 } 1799 1800 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) { 1801 res = -EFAULT; 1802 break; 1803 } 1804 } else { 1805 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) { 1806 res = -EINVAL; 1807 break; 1808 } 1809 } 1810 res = 0; 1811 break; 1812 } 1813 1814 case SIOCAX25ADDFWD: 1815 case SIOCAX25DELFWD: { 1816 struct ax25_fwd_struct ax25_fwd; 1817 if (!capable(CAP_NET_ADMIN)) { 1818 res = -EPERM; 1819 break; 1820 } 1821 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) { 1822 res = -EFAULT; 1823 break; 1824 } 1825 res = ax25_fwd_ioctl(cmd, &ax25_fwd); 1826 break; 1827 } 1828 1829 case SIOCGIFADDR: 1830 case SIOCSIFADDR: 1831 case SIOCGIFDSTADDR: 1832 case SIOCSIFDSTADDR: 1833 case SIOCGIFBRDADDR: 1834 case SIOCSIFBRDADDR: 1835 case SIOCGIFNETMASK: 1836 case SIOCSIFNETMASK: 1837 case SIOCGIFMETRIC: 1838 case SIOCSIFMETRIC: 1839 res = -EINVAL; 1840 break; 1841 1842 default: 1843 res = -ENOIOCTLCMD; 1844 break; 1845 } 1846 release_sock(sk); 1847 1848 return res; 1849 } 1850 1851 #ifdef CONFIG_PROC_FS 1852 1853 static void *ax25_info_start(struct seq_file *seq, loff_t *pos) 1854 __acquires(ax25_list_lock) 1855 { 1856 spin_lock_bh(&ax25_list_lock); 1857 return seq_hlist_start(&ax25_list, *pos); 1858 } 1859 1860 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos) 1861 { 1862 return seq_hlist_next(v, &ax25_list, pos); 1863 } 1864 1865 static void ax25_info_stop(struct seq_file *seq, void *v) 1866 __releases(ax25_list_lock) 1867 { 1868 spin_unlock_bh(&ax25_list_lock); 1869 } 1870 1871 static int ax25_info_show(struct seq_file *seq, void *v) 1872 { 1873 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node); 1874 char buf[11]; 1875 int k; 1876 1877 1878 /* 1879 * New format: 1880 * magic dev src_addr dest_addr,digi1,digi2,.. st vs vr va t1 t1 t2 t2 t3 t3 idle idle n2 n2 rtt window paclen Snd-Q Rcv-Q inode 1881 */ 1882 1883 seq_printf(seq, "%8.8lx %s %s%s ", 1884 (long) ax25, 1885 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name, 1886 ax2asc(buf, &ax25->source_addr), 1887 ax25->iamdigi? "*":""); 1888 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr)); 1889 1890 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) { 1891 seq_printf(seq, ",%s%s", 1892 ax2asc(buf, &ax25->digipeat->calls[k]), 1893 ax25->digipeat->repeated[k]? "*":""); 1894 } 1895 1896 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d", 1897 ax25->state, 1898 ax25->vs, ax25->vr, ax25->va, 1899 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ, 1900 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ, 1901 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ, 1902 ax25_display_timer(&ax25->idletimer) / (60 * HZ), 1903 ax25->idle / (60 * HZ), 1904 ax25->n2count, ax25->n2, 1905 ax25->rtt / HZ, 1906 ax25->window, 1907 ax25->paclen); 1908 1909 if (ax25->sk != NULL) { 1910 seq_printf(seq, " %d %d %lu\n", 1911 sk_wmem_alloc_get(ax25->sk), 1912 sk_rmem_alloc_get(ax25->sk), 1913 sock_i_ino(ax25->sk)); 1914 } else { 1915 seq_puts(seq, " * * *\n"); 1916 } 1917 return 0; 1918 } 1919 1920 static const struct seq_operations ax25_info_seqops = { 1921 .start = ax25_info_start, 1922 .next = ax25_info_next, 1923 .stop = ax25_info_stop, 1924 .show = ax25_info_show, 1925 }; 1926 1927 static int ax25_info_open(struct inode *inode, struct file *file) 1928 { 1929 return seq_open(file, &ax25_info_seqops); 1930 } 1931 1932 static const struct file_operations ax25_info_fops = { 1933 .owner = THIS_MODULE, 1934 .open = ax25_info_open, 1935 .read = seq_read, 1936 .llseek = seq_lseek, 1937 .release = seq_release, 1938 }; 1939 1940 #endif 1941 1942 static const struct net_proto_family ax25_family_ops = { 1943 .family = PF_AX25, 1944 .create = ax25_create, 1945 .owner = THIS_MODULE, 1946 }; 1947 1948 static const struct proto_ops ax25_proto_ops = { 1949 .family = PF_AX25, 1950 .owner = THIS_MODULE, 1951 .release = ax25_release, 1952 .bind = ax25_bind, 1953 .connect = ax25_connect, 1954 .socketpair = sock_no_socketpair, 1955 .accept = ax25_accept, 1956 .getname = ax25_getname, 1957 .poll = datagram_poll, 1958 .ioctl = ax25_ioctl, 1959 .listen = ax25_listen, 1960 .shutdown = ax25_shutdown, 1961 .setsockopt = ax25_setsockopt, 1962 .getsockopt = ax25_getsockopt, 1963 .sendmsg = ax25_sendmsg, 1964 .recvmsg = ax25_recvmsg, 1965 .mmap = sock_no_mmap, 1966 .sendpage = sock_no_sendpage, 1967 }; 1968 1969 /* 1970 * Called by socket.c on kernel start up 1971 */ 1972 static struct packet_type ax25_packet_type __read_mostly = { 1973 .type = cpu_to_be16(ETH_P_AX25), 1974 .func = ax25_kiss_rcv, 1975 }; 1976 1977 static struct notifier_block ax25_dev_notifier = { 1978 .notifier_call = ax25_device_event, 1979 }; 1980 1981 static int __init ax25_init(void) 1982 { 1983 int rc = proto_register(&ax25_proto, 0); 1984 1985 if (rc != 0) 1986 goto out; 1987 1988 sock_register(&ax25_family_ops); 1989 dev_add_pack(&ax25_packet_type); 1990 register_netdevice_notifier(&ax25_dev_notifier); 1991 1992 proc_create("ax25_route", S_IRUGO, init_net.proc_net, 1993 &ax25_route_fops); 1994 proc_create("ax25", S_IRUGO, init_net.proc_net, &ax25_info_fops); 1995 proc_create("ax25_calls", S_IRUGO, init_net.proc_net, &ax25_uid_fops); 1996 out: 1997 return rc; 1998 } 1999 module_init(ax25_init); 2000 2001 2002 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 2003 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol"); 2004 MODULE_LICENSE("GPL"); 2005 MODULE_ALIAS_NETPROTO(PF_AX25); 2006 2007 static void __exit ax25_exit(void) 2008 { 2009 remove_proc_entry("ax25_route", init_net.proc_net); 2010 remove_proc_entry("ax25", init_net.proc_net); 2011 remove_proc_entry("ax25_calls", init_net.proc_net); 2012 2013 unregister_netdevice_notifier(&ax25_dev_notifier); 2014 2015 dev_remove_pack(&ax25_packet_type); 2016 2017 sock_unregister(PF_AX25); 2018 proto_unregister(&ax25_proto); 2019 2020 ax25_rt_free(); 2021 ax25_uid_free(); 2022 ax25_dev_free(); 2023 } 2024 module_exit(ax25_exit); 2025