1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * 4 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) 5 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 6 * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk) 7 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org) 8 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) 9 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) 10 * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl) 11 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) 12 */ 13 #include <linux/capability.h> 14 #include <linux/module.h> 15 #include <linux/errno.h> 16 #include <linux/types.h> 17 #include <linux/socket.h> 18 #include <linux/in.h> 19 #include <linux/kernel.h> 20 #include <linux/sched/signal.h> 21 #include <linux/timer.h> 22 #include <linux/string.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/slab.h> 26 #include <net/ax25.h> 27 #include <linux/inet.h> 28 #include <linux/netdevice.h> 29 #include <linux/if_arp.h> 30 #include <linux/skbuff.h> 31 #include <net/sock.h> 32 #include <linux/uaccess.h> 33 #include <linux/fcntl.h> 34 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 35 #include <linux/mm.h> 36 #include <linux/interrupt.h> 37 #include <linux/notifier.h> 38 #include <linux/proc_fs.h> 39 #include <linux/stat.h> 40 #include <linux/sysctl.h> 41 #include <linux/init.h> 42 #include <linux/spinlock.h> 43 #include <net/net_namespace.h> 44 #include <net/tcp_states.h> 45 #include <net/ip.h> 46 #include <net/arp.h> 47 48 49 50 HLIST_HEAD(ax25_list); 51 DEFINE_SPINLOCK(ax25_list_lock); 52 53 static const struct proto_ops ax25_proto_ops; 54 55 static void ax25_free_sock(struct sock *sk) 56 { 57 ax25_cb_put(sk_to_ax25(sk)); 58 } 59 60 /* 61 * Socket removal during an interrupt is now safe. 62 */ 63 static void ax25_cb_del(ax25_cb *ax25) 64 { 65 if (!hlist_unhashed(&ax25->ax25_node)) { 66 spin_lock_bh(&ax25_list_lock); 67 hlist_del_init(&ax25->ax25_node); 68 spin_unlock_bh(&ax25_list_lock); 69 ax25_cb_put(ax25); 70 } 71 } 72 73 /* 74 * Kill all bound sockets on a dropped device. 75 */ 76 static void ax25_kill_by_device(struct net_device *dev) 77 { 78 ax25_dev *ax25_dev; 79 ax25_cb *s; 80 81 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 82 return; 83 84 spin_lock_bh(&ax25_list_lock); 85 again: 86 ax25_for_each(s, &ax25_list) { 87 if (s->ax25_dev == ax25_dev) { 88 s->ax25_dev = NULL; 89 spin_unlock_bh(&ax25_list_lock); 90 ax25_disconnect(s, ENETUNREACH); 91 spin_lock_bh(&ax25_list_lock); 92 93 /* The entry could have been deleted from the 94 * list meanwhile and thus the next pointer is 95 * no longer valid. Play it safe and restart 96 * the scan. Forward progress is ensured 97 * because we set s->ax25_dev to NULL and we 98 * are never passed a NULL 'dev' argument. 99 */ 100 goto again; 101 } 102 } 103 spin_unlock_bh(&ax25_list_lock); 104 } 105 106 /* 107 * Handle device status changes. 108 */ 109 static int ax25_device_event(struct notifier_block *this, unsigned long event, 110 void *ptr) 111 { 112 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 113 114 if (!net_eq(dev_net(dev), &init_net)) 115 return NOTIFY_DONE; 116 117 /* Reject non AX.25 devices */ 118 if (dev->type != ARPHRD_AX25) 119 return NOTIFY_DONE; 120 121 switch (event) { 122 case NETDEV_UP: 123 ax25_dev_device_up(dev); 124 break; 125 case NETDEV_DOWN: 126 ax25_kill_by_device(dev); 127 ax25_rt_device_down(dev); 128 ax25_dev_device_down(dev); 129 break; 130 default: 131 break; 132 } 133 134 return NOTIFY_DONE; 135 } 136 137 /* 138 * Add a socket to the bound sockets list. 139 */ 140 void ax25_cb_add(ax25_cb *ax25) 141 { 142 spin_lock_bh(&ax25_list_lock); 143 ax25_cb_hold(ax25); 144 hlist_add_head(&ax25->ax25_node, &ax25_list); 145 spin_unlock_bh(&ax25_list_lock); 146 } 147 148 /* 149 * Find a socket that wants to accept the SABM we have just 150 * received. 151 */ 152 struct sock *ax25_find_listener(ax25_address *addr, int digi, 153 struct net_device *dev, int type) 154 { 155 ax25_cb *s; 156 157 spin_lock(&ax25_list_lock); 158 ax25_for_each(s, &ax25_list) { 159 if ((s->iamdigi && !digi) || (!s->iamdigi && digi)) 160 continue; 161 if (s->sk && !ax25cmp(&s->source_addr, addr) && 162 s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) { 163 /* If device is null we match any device */ 164 if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) { 165 sock_hold(s->sk); 166 spin_unlock(&ax25_list_lock); 167 return s->sk; 168 } 169 } 170 } 171 spin_unlock(&ax25_list_lock); 172 173 return NULL; 174 } 175 176 /* 177 * Find an AX.25 socket given both ends. 178 */ 179 struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr, 180 int type) 181 { 182 struct sock *sk = NULL; 183 ax25_cb *s; 184 185 spin_lock(&ax25_list_lock); 186 ax25_for_each(s, &ax25_list) { 187 if (s->sk && !ax25cmp(&s->source_addr, my_addr) && 188 !ax25cmp(&s->dest_addr, dest_addr) && 189 s->sk->sk_type == type) { 190 sk = s->sk; 191 sock_hold(sk); 192 break; 193 } 194 } 195 196 spin_unlock(&ax25_list_lock); 197 198 return sk; 199 } 200 201 /* 202 * Find an AX.25 control block given both ends. It will only pick up 203 * floating AX.25 control blocks or non Raw socket bound control blocks. 204 */ 205 ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr, 206 ax25_digi *digi, struct net_device *dev) 207 { 208 ax25_cb *s; 209 210 spin_lock_bh(&ax25_list_lock); 211 ax25_for_each(s, &ax25_list) { 212 if (s->sk && s->sk->sk_type != SOCK_SEQPACKET) 213 continue; 214 if (s->ax25_dev == NULL) 215 continue; 216 if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) { 217 if (digi != NULL && digi->ndigi != 0) { 218 if (s->digipeat == NULL) 219 continue; 220 if (ax25digicmp(s->digipeat, digi) != 0) 221 continue; 222 } else { 223 if (s->digipeat != NULL && s->digipeat->ndigi != 0) 224 continue; 225 } 226 ax25_cb_hold(s); 227 spin_unlock_bh(&ax25_list_lock); 228 229 return s; 230 } 231 } 232 spin_unlock_bh(&ax25_list_lock); 233 234 return NULL; 235 } 236 237 EXPORT_SYMBOL(ax25_find_cb); 238 239 void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto) 240 { 241 ax25_cb *s; 242 struct sk_buff *copy; 243 244 spin_lock(&ax25_list_lock); 245 ax25_for_each(s, &ax25_list) { 246 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && 247 s->sk->sk_type == SOCK_RAW && 248 s->sk->sk_protocol == proto && 249 s->ax25_dev->dev == skb->dev && 250 atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) { 251 if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL) 252 continue; 253 if (sock_queue_rcv_skb(s->sk, copy) != 0) 254 kfree_skb(copy); 255 } 256 } 257 spin_unlock(&ax25_list_lock); 258 } 259 260 /* 261 * Deferred destroy. 262 */ 263 void ax25_destroy_socket(ax25_cb *); 264 265 /* 266 * Handler for deferred kills. 267 */ 268 static void ax25_destroy_timer(struct timer_list *t) 269 { 270 ax25_cb *ax25 = from_timer(ax25, t, dtimer); 271 struct sock *sk; 272 273 sk=ax25->sk; 274 275 bh_lock_sock(sk); 276 sock_hold(sk); 277 ax25_destroy_socket(ax25); 278 bh_unlock_sock(sk); 279 sock_put(sk); 280 } 281 282 /* 283 * This is called from user mode and the timers. Thus it protects itself 284 * against interrupt users but doesn't worry about being called during 285 * work. Once it is removed from the queue no interrupt or bottom half 286 * will touch it and we are (fairly 8-) ) safe. 287 */ 288 void ax25_destroy_socket(ax25_cb *ax25) 289 { 290 struct sk_buff *skb; 291 292 ax25_cb_del(ax25); 293 294 ax25_stop_heartbeat(ax25); 295 ax25_stop_t1timer(ax25); 296 ax25_stop_t2timer(ax25); 297 ax25_stop_t3timer(ax25); 298 ax25_stop_idletimer(ax25); 299 300 ax25_clear_queues(ax25); /* Flush the queues */ 301 302 if (ax25->sk != NULL) { 303 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) { 304 if (skb->sk != ax25->sk) { 305 /* A pending connection */ 306 ax25_cb *sax25 = sk_to_ax25(skb->sk); 307 308 /* Queue the unaccepted socket for death */ 309 sock_orphan(skb->sk); 310 311 /* 9A4GL: hack to release unaccepted sockets */ 312 skb->sk->sk_state = TCP_LISTEN; 313 314 ax25_start_heartbeat(sax25); 315 sax25->state = AX25_STATE_0; 316 } 317 318 kfree_skb(skb); 319 } 320 skb_queue_purge(&ax25->sk->sk_write_queue); 321 } 322 323 if (ax25->sk != NULL) { 324 if (sk_has_allocations(ax25->sk)) { 325 /* Defer: outstanding buffers */ 326 timer_setup(&ax25->dtimer, ax25_destroy_timer, 0); 327 ax25->dtimer.expires = jiffies + 2 * HZ; 328 add_timer(&ax25->dtimer); 329 } else { 330 struct sock *sk=ax25->sk; 331 ax25->sk=NULL; 332 sock_put(sk); 333 } 334 } else { 335 ax25_cb_put(ax25); 336 } 337 } 338 339 /* 340 * dl1bke 960311: set parameters for existing AX.25 connections, 341 * includes a KILL command to abort any connection. 342 * VERY useful for debugging ;-) 343 */ 344 static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) 345 { 346 struct ax25_ctl_struct ax25_ctl; 347 ax25_digi digi; 348 ax25_dev *ax25_dev; 349 ax25_cb *ax25; 350 unsigned int k; 351 int ret = 0; 352 353 if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl))) 354 return -EFAULT; 355 356 if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL) 357 return -ENODEV; 358 359 if (ax25_ctl.digi_count > AX25_MAX_DIGIS) 360 return -EINVAL; 361 362 if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL) 363 return -EINVAL; 364 365 digi.ndigi = ax25_ctl.digi_count; 366 for (k = 0; k < digi.ndigi; k++) 367 digi.calls[k] = ax25_ctl.digi_addr[k]; 368 369 if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL) 370 return -ENOTCONN; 371 372 switch (ax25_ctl.cmd) { 373 case AX25_KILL: 374 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); 375 #ifdef CONFIG_AX25_DAMA_SLAVE 376 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE) 377 ax25_dama_off(ax25); 378 #endif 379 ax25_disconnect(ax25, ENETRESET); 380 break; 381 382 case AX25_WINDOW: 383 if (ax25->modulus == AX25_MODULUS) { 384 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7) 385 goto einval_put; 386 } else { 387 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63) 388 goto einval_put; 389 } 390 ax25->window = ax25_ctl.arg; 391 break; 392 393 case AX25_T1: 394 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) 395 goto einval_put; 396 ax25->rtt = (ax25_ctl.arg * HZ) / 2; 397 ax25->t1 = ax25_ctl.arg * HZ; 398 break; 399 400 case AX25_T2: 401 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) 402 goto einval_put; 403 ax25->t2 = ax25_ctl.arg * HZ; 404 break; 405 406 case AX25_N2: 407 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31) 408 goto einval_put; 409 ax25->n2count = 0; 410 ax25->n2 = ax25_ctl.arg; 411 break; 412 413 case AX25_T3: 414 if (ax25_ctl.arg > ULONG_MAX / HZ) 415 goto einval_put; 416 ax25->t3 = ax25_ctl.arg * HZ; 417 break; 418 419 case AX25_IDLE: 420 if (ax25_ctl.arg > ULONG_MAX / (60 * HZ)) 421 goto einval_put; 422 423 ax25->idle = ax25_ctl.arg * 60 * HZ; 424 break; 425 426 case AX25_PACLEN: 427 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535) 428 goto einval_put; 429 ax25->paclen = ax25_ctl.arg; 430 break; 431 432 default: 433 goto einval_put; 434 } 435 436 out_put: 437 ax25_cb_put(ax25); 438 return ret; 439 440 einval_put: 441 ret = -EINVAL; 442 goto out_put; 443 } 444 445 static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev) 446 { 447 ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2; 448 ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]); 449 ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]); 450 ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]); 451 ax25->n2 = ax25_dev->values[AX25_VALUES_N2]; 452 ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN]; 453 ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]); 454 ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF]; 455 456 if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) { 457 ax25->modulus = AX25_EMODULUS; 458 ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW]; 459 } else { 460 ax25->modulus = AX25_MODULUS; 461 ax25->window = ax25_dev->values[AX25_VALUES_WINDOW]; 462 } 463 } 464 465 /* 466 * Fill in a created AX.25 created control block with the default 467 * values for a particular device. 468 */ 469 void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev) 470 { 471 ax25->ax25_dev = ax25_dev; 472 473 if (ax25->ax25_dev != NULL) { 474 ax25_fillin_cb_from_dev(ax25, ax25_dev); 475 return; 476 } 477 478 /* 479 * No device, use kernel / AX.25 spec default values 480 */ 481 ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2; 482 ax25->t1 = msecs_to_jiffies(AX25_DEF_T1); 483 ax25->t2 = msecs_to_jiffies(AX25_DEF_T2); 484 ax25->t3 = msecs_to_jiffies(AX25_DEF_T3); 485 ax25->n2 = AX25_DEF_N2; 486 ax25->paclen = AX25_DEF_PACLEN; 487 ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE); 488 ax25->backoff = AX25_DEF_BACKOFF; 489 490 if (AX25_DEF_AXDEFMODE) { 491 ax25->modulus = AX25_EMODULUS; 492 ax25->window = AX25_DEF_EWINDOW; 493 } else { 494 ax25->modulus = AX25_MODULUS; 495 ax25->window = AX25_DEF_WINDOW; 496 } 497 } 498 499 /* 500 * Create an empty AX.25 control block. 501 */ 502 ax25_cb *ax25_create_cb(void) 503 { 504 ax25_cb *ax25; 505 506 if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL) 507 return NULL; 508 509 refcount_set(&ax25->refcount, 1); 510 511 skb_queue_head_init(&ax25->write_queue); 512 skb_queue_head_init(&ax25->frag_queue); 513 skb_queue_head_init(&ax25->ack_queue); 514 skb_queue_head_init(&ax25->reseq_queue); 515 516 ax25_setup_timers(ax25); 517 518 ax25_fillin_cb(ax25, NULL); 519 520 ax25->state = AX25_STATE_0; 521 522 return ax25; 523 } 524 525 /* 526 * Handling for system calls applied via the various interfaces to an 527 * AX25 socket object 528 */ 529 530 static int ax25_setsockopt(struct socket *sock, int level, int optname, 531 sockptr_t optval, unsigned int optlen) 532 { 533 struct sock *sk = sock->sk; 534 ax25_cb *ax25; 535 struct net_device *dev; 536 char devname[IFNAMSIZ]; 537 unsigned long opt; 538 int res = 0; 539 540 if (level != SOL_AX25) 541 return -ENOPROTOOPT; 542 543 if (optlen < sizeof(unsigned int)) 544 return -EINVAL; 545 546 if (copy_from_sockptr(&opt, optval, sizeof(unsigned int))) 547 return -EFAULT; 548 549 lock_sock(sk); 550 ax25 = sk_to_ax25(sk); 551 552 switch (optname) { 553 case AX25_WINDOW: 554 if (ax25->modulus == AX25_MODULUS) { 555 if (opt < 1 || opt > 7) { 556 res = -EINVAL; 557 break; 558 } 559 } else { 560 if (opt < 1 || opt > 63) { 561 res = -EINVAL; 562 break; 563 } 564 } 565 ax25->window = opt; 566 break; 567 568 case AX25_T1: 569 if (opt < 1 || opt > ULONG_MAX / HZ) { 570 res = -EINVAL; 571 break; 572 } 573 ax25->rtt = (opt * HZ) >> 1; 574 ax25->t1 = opt * HZ; 575 break; 576 577 case AX25_T2: 578 if (opt < 1 || opt > ULONG_MAX / HZ) { 579 res = -EINVAL; 580 break; 581 } 582 ax25->t2 = opt * HZ; 583 break; 584 585 case AX25_N2: 586 if (opt < 1 || opt > 31) { 587 res = -EINVAL; 588 break; 589 } 590 ax25->n2 = opt; 591 break; 592 593 case AX25_T3: 594 if (opt < 1 || opt > ULONG_MAX / HZ) { 595 res = -EINVAL; 596 break; 597 } 598 ax25->t3 = opt * HZ; 599 break; 600 601 case AX25_IDLE: 602 if (opt > ULONG_MAX / (60 * HZ)) { 603 res = -EINVAL; 604 break; 605 } 606 ax25->idle = opt * 60 * HZ; 607 break; 608 609 case AX25_BACKOFF: 610 if (opt > 2) { 611 res = -EINVAL; 612 break; 613 } 614 ax25->backoff = opt; 615 break; 616 617 case AX25_EXTSEQ: 618 ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS; 619 break; 620 621 case AX25_PIDINCL: 622 ax25->pidincl = opt ? 1 : 0; 623 break; 624 625 case AX25_IAMDIGI: 626 ax25->iamdigi = opt ? 1 : 0; 627 break; 628 629 case AX25_PACLEN: 630 if (opt < 16 || opt > 65535) { 631 res = -EINVAL; 632 break; 633 } 634 ax25->paclen = opt; 635 break; 636 637 case SO_BINDTODEVICE: 638 if (optlen > IFNAMSIZ - 1) 639 optlen = IFNAMSIZ - 1; 640 641 memset(devname, 0, sizeof(devname)); 642 643 if (copy_from_sockptr(devname, optval, optlen)) { 644 res = -EFAULT; 645 break; 646 } 647 648 if (sk->sk_type == SOCK_SEQPACKET && 649 (sock->state != SS_UNCONNECTED || 650 sk->sk_state == TCP_LISTEN)) { 651 res = -EADDRNOTAVAIL; 652 break; 653 } 654 655 rtnl_lock(); 656 dev = __dev_get_by_name(&init_net, devname); 657 if (!dev) { 658 rtnl_unlock(); 659 res = -ENODEV; 660 break; 661 } 662 663 ax25->ax25_dev = ax25_dev_ax25dev(dev); 664 if (!ax25->ax25_dev) { 665 rtnl_unlock(); 666 res = -ENODEV; 667 break; 668 } 669 ax25_fillin_cb(ax25, ax25->ax25_dev); 670 rtnl_unlock(); 671 break; 672 673 default: 674 res = -ENOPROTOOPT; 675 } 676 release_sock(sk); 677 678 return res; 679 } 680 681 static int ax25_getsockopt(struct socket *sock, int level, int optname, 682 char __user *optval, int __user *optlen) 683 { 684 struct sock *sk = sock->sk; 685 ax25_cb *ax25; 686 struct ax25_dev *ax25_dev; 687 char devname[IFNAMSIZ]; 688 void *valptr; 689 int val = 0; 690 int maxlen, length; 691 692 if (level != SOL_AX25) 693 return -ENOPROTOOPT; 694 695 if (get_user(maxlen, optlen)) 696 return -EFAULT; 697 698 if (maxlen < 1) 699 return -EFAULT; 700 701 valptr = (void *) &val; 702 length = min_t(unsigned int, maxlen, sizeof(int)); 703 704 lock_sock(sk); 705 ax25 = sk_to_ax25(sk); 706 707 switch (optname) { 708 case AX25_WINDOW: 709 val = ax25->window; 710 break; 711 712 case AX25_T1: 713 val = ax25->t1 / HZ; 714 break; 715 716 case AX25_T2: 717 val = ax25->t2 / HZ; 718 break; 719 720 case AX25_N2: 721 val = ax25->n2; 722 break; 723 724 case AX25_T3: 725 val = ax25->t3 / HZ; 726 break; 727 728 case AX25_IDLE: 729 val = ax25->idle / (60 * HZ); 730 break; 731 732 case AX25_BACKOFF: 733 val = ax25->backoff; 734 break; 735 736 case AX25_EXTSEQ: 737 val = (ax25->modulus == AX25_EMODULUS); 738 break; 739 740 case AX25_PIDINCL: 741 val = ax25->pidincl; 742 break; 743 744 case AX25_IAMDIGI: 745 val = ax25->iamdigi; 746 break; 747 748 case AX25_PACLEN: 749 val = ax25->paclen; 750 break; 751 752 case SO_BINDTODEVICE: 753 ax25_dev = ax25->ax25_dev; 754 755 if (ax25_dev != NULL && ax25_dev->dev != NULL) { 756 strlcpy(devname, ax25_dev->dev->name, sizeof(devname)); 757 length = strlen(devname) + 1; 758 } else { 759 *devname = '\0'; 760 length = 1; 761 } 762 763 valptr = (void *) devname; 764 break; 765 766 default: 767 release_sock(sk); 768 return -ENOPROTOOPT; 769 } 770 release_sock(sk); 771 772 if (put_user(length, optlen)) 773 return -EFAULT; 774 775 return copy_to_user(optval, valptr, length) ? -EFAULT : 0; 776 } 777 778 static int ax25_listen(struct socket *sock, int backlog) 779 { 780 struct sock *sk = sock->sk; 781 int res = 0; 782 783 lock_sock(sk); 784 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) { 785 sk->sk_max_ack_backlog = backlog; 786 sk->sk_state = TCP_LISTEN; 787 goto out; 788 } 789 res = -EOPNOTSUPP; 790 791 out: 792 release_sock(sk); 793 794 return res; 795 } 796 797 /* 798 * XXX: when creating ax25_sock we should update the .obj_size setting 799 * below. 800 */ 801 static struct proto ax25_proto = { 802 .name = "AX25", 803 .owner = THIS_MODULE, 804 .obj_size = sizeof(struct ax25_sock), 805 }; 806 807 static int ax25_create(struct net *net, struct socket *sock, int protocol, 808 int kern) 809 { 810 struct sock *sk; 811 ax25_cb *ax25; 812 813 if (protocol < 0 || protocol > U8_MAX) 814 return -EINVAL; 815 816 if (!net_eq(net, &init_net)) 817 return -EAFNOSUPPORT; 818 819 switch (sock->type) { 820 case SOCK_DGRAM: 821 if (protocol == 0 || protocol == PF_AX25) 822 protocol = AX25_P_TEXT; 823 break; 824 825 case SOCK_SEQPACKET: 826 switch (protocol) { 827 case 0: 828 case PF_AX25: /* For CLX */ 829 protocol = AX25_P_TEXT; 830 break; 831 case AX25_P_SEGMENT: 832 #ifdef CONFIG_INET 833 case AX25_P_ARP: 834 case AX25_P_IP: 835 #endif 836 #ifdef CONFIG_NETROM 837 case AX25_P_NETROM: 838 #endif 839 #ifdef CONFIG_ROSE 840 case AX25_P_ROSE: 841 #endif 842 return -ESOCKTNOSUPPORT; 843 #ifdef CONFIG_NETROM_MODULE 844 case AX25_P_NETROM: 845 if (ax25_protocol_is_registered(AX25_P_NETROM)) 846 return -ESOCKTNOSUPPORT; 847 break; 848 #endif 849 #ifdef CONFIG_ROSE_MODULE 850 case AX25_P_ROSE: 851 if (ax25_protocol_is_registered(AX25_P_ROSE)) 852 return -ESOCKTNOSUPPORT; 853 #endif 854 default: 855 break; 856 } 857 break; 858 859 case SOCK_RAW: 860 if (!capable(CAP_NET_RAW)) 861 return -EPERM; 862 break; 863 default: 864 return -ESOCKTNOSUPPORT; 865 } 866 867 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern); 868 if (sk == NULL) 869 return -ENOMEM; 870 871 ax25 = ax25_sk(sk)->cb = ax25_create_cb(); 872 if (!ax25) { 873 sk_free(sk); 874 return -ENOMEM; 875 } 876 877 sock_init_data(sock, sk); 878 879 sk->sk_destruct = ax25_free_sock; 880 sock->ops = &ax25_proto_ops; 881 sk->sk_protocol = protocol; 882 883 ax25->sk = sk; 884 885 return 0; 886 } 887 888 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev) 889 { 890 struct sock *sk; 891 ax25_cb *ax25, *oax25; 892 893 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0); 894 if (sk == NULL) 895 return NULL; 896 897 if ((ax25 = ax25_create_cb()) == NULL) { 898 sk_free(sk); 899 return NULL; 900 } 901 902 switch (osk->sk_type) { 903 case SOCK_DGRAM: 904 break; 905 case SOCK_SEQPACKET: 906 break; 907 default: 908 sk_free(sk); 909 ax25_cb_put(ax25); 910 return NULL; 911 } 912 913 sock_init_data(NULL, sk); 914 915 sk->sk_type = osk->sk_type; 916 sk->sk_priority = osk->sk_priority; 917 sk->sk_protocol = osk->sk_protocol; 918 sk->sk_rcvbuf = osk->sk_rcvbuf; 919 sk->sk_sndbuf = osk->sk_sndbuf; 920 sk->sk_state = TCP_ESTABLISHED; 921 sock_copy_flags(sk, osk); 922 923 oax25 = sk_to_ax25(osk); 924 925 ax25->modulus = oax25->modulus; 926 ax25->backoff = oax25->backoff; 927 ax25->pidincl = oax25->pidincl; 928 ax25->iamdigi = oax25->iamdigi; 929 ax25->rtt = oax25->rtt; 930 ax25->t1 = oax25->t1; 931 ax25->t2 = oax25->t2; 932 ax25->t3 = oax25->t3; 933 ax25->n2 = oax25->n2; 934 ax25->idle = oax25->idle; 935 ax25->paclen = oax25->paclen; 936 ax25->window = oax25->window; 937 938 ax25->ax25_dev = ax25_dev; 939 ax25->source_addr = oax25->source_addr; 940 941 if (oax25->digipeat != NULL) { 942 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi), 943 GFP_ATOMIC); 944 if (ax25->digipeat == NULL) { 945 sk_free(sk); 946 ax25_cb_put(ax25); 947 return NULL; 948 } 949 } 950 951 ax25_sk(sk)->cb = ax25; 952 sk->sk_destruct = ax25_free_sock; 953 ax25->sk = sk; 954 955 return sk; 956 } 957 958 static int ax25_release(struct socket *sock) 959 { 960 struct sock *sk = sock->sk; 961 ax25_cb *ax25; 962 963 if (sk == NULL) 964 return 0; 965 966 sock_hold(sk); 967 sock_orphan(sk); 968 lock_sock(sk); 969 ax25 = sk_to_ax25(sk); 970 971 if (sk->sk_type == SOCK_SEQPACKET) { 972 switch (ax25->state) { 973 case AX25_STATE_0: 974 release_sock(sk); 975 ax25_disconnect(ax25, 0); 976 lock_sock(sk); 977 ax25_destroy_socket(ax25); 978 break; 979 980 case AX25_STATE_1: 981 case AX25_STATE_2: 982 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); 983 release_sock(sk); 984 ax25_disconnect(ax25, 0); 985 lock_sock(sk); 986 if (!sock_flag(ax25->sk, SOCK_DESTROY)) 987 ax25_destroy_socket(ax25); 988 break; 989 990 case AX25_STATE_3: 991 case AX25_STATE_4: 992 ax25_clear_queues(ax25); 993 ax25->n2count = 0; 994 995 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { 996 case AX25_PROTO_STD_SIMPLEX: 997 case AX25_PROTO_STD_DUPLEX: 998 ax25_send_control(ax25, 999 AX25_DISC, 1000 AX25_POLLON, 1001 AX25_COMMAND); 1002 ax25_stop_t2timer(ax25); 1003 ax25_stop_t3timer(ax25); 1004 ax25_stop_idletimer(ax25); 1005 break; 1006 #ifdef CONFIG_AX25_DAMA_SLAVE 1007 case AX25_PROTO_DAMA_SLAVE: 1008 ax25_stop_t3timer(ax25); 1009 ax25_stop_idletimer(ax25); 1010 break; 1011 #endif 1012 } 1013 ax25_calculate_t1(ax25); 1014 ax25_start_t1timer(ax25); 1015 ax25->state = AX25_STATE_2; 1016 sk->sk_state = TCP_CLOSE; 1017 sk->sk_shutdown |= SEND_SHUTDOWN; 1018 sk->sk_state_change(sk); 1019 sock_set_flag(sk, SOCK_DESTROY); 1020 break; 1021 1022 default: 1023 break; 1024 } 1025 } else { 1026 sk->sk_state = TCP_CLOSE; 1027 sk->sk_shutdown |= SEND_SHUTDOWN; 1028 sk->sk_state_change(sk); 1029 ax25_destroy_socket(ax25); 1030 } 1031 1032 sock->sk = NULL; 1033 release_sock(sk); 1034 sock_put(sk); 1035 1036 return 0; 1037 } 1038 1039 /* 1040 * We support a funny extension here so you can (as root) give any callsign 1041 * digipeated via a local address as source. This hack is obsolete now 1042 * that we've implemented support for SO_BINDTODEVICE. It is however small 1043 * and trivially backward compatible. 1044 */ 1045 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 1046 { 1047 struct sock *sk = sock->sk; 1048 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 1049 ax25_dev *ax25_dev = NULL; 1050 ax25_uid_assoc *user; 1051 ax25_address call; 1052 ax25_cb *ax25; 1053 int err = 0; 1054 1055 if (addr_len != sizeof(struct sockaddr_ax25) && 1056 addr_len != sizeof(struct full_sockaddr_ax25)) 1057 /* support for old structure may go away some time 1058 * ax25_bind(): uses old (6 digipeater) socket structure. 1059 */ 1060 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || 1061 (addr_len > sizeof(struct full_sockaddr_ax25))) 1062 return -EINVAL; 1063 1064 if (addr->fsa_ax25.sax25_family != AF_AX25) 1065 return -EINVAL; 1066 1067 user = ax25_findbyuid(current_euid()); 1068 if (user) { 1069 call = user->call; 1070 ax25_uid_put(user); 1071 } else { 1072 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) 1073 return -EACCES; 1074 1075 call = addr->fsa_ax25.sax25_call; 1076 } 1077 1078 lock_sock(sk); 1079 1080 ax25 = sk_to_ax25(sk); 1081 if (!sock_flag(sk, SOCK_ZAPPED)) { 1082 err = -EINVAL; 1083 goto out; 1084 } 1085 1086 ax25->source_addr = call; 1087 1088 /* 1089 * User already set interface with SO_BINDTODEVICE 1090 */ 1091 if (ax25->ax25_dev != NULL) 1092 goto done; 1093 1094 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) { 1095 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 && 1096 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) { 1097 err = -EADDRNOTAVAIL; 1098 goto out; 1099 } 1100 } else { 1101 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) { 1102 err = -EADDRNOTAVAIL; 1103 goto out; 1104 } 1105 } 1106 1107 if (ax25_dev != NULL) 1108 ax25_fillin_cb(ax25, ax25_dev); 1109 1110 done: 1111 ax25_cb_add(ax25); 1112 sock_reset_flag(sk, SOCK_ZAPPED); 1113 1114 out: 1115 release_sock(sk); 1116 1117 return err; 1118 } 1119 1120 /* 1121 * FIXME: nonblock behaviour looks like it may have a bug. 1122 */ 1123 static int __must_check ax25_connect(struct socket *sock, 1124 struct sockaddr *uaddr, int addr_len, int flags) 1125 { 1126 struct sock *sk = sock->sk; 1127 ax25_cb *ax25 = sk_to_ax25(sk), *ax25t; 1128 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; 1129 ax25_digi *digi = NULL; 1130 int ct = 0, err = 0; 1131 1132 /* 1133 * some sanity checks. code further down depends on this 1134 */ 1135 1136 if (addr_len == sizeof(struct sockaddr_ax25)) 1137 /* support for this will go away in early 2.5.x 1138 * ax25_connect(): uses obsolete socket structure 1139 */ 1140 ; 1141 else if (addr_len != sizeof(struct full_sockaddr_ax25)) 1142 /* support for old structure may go away some time 1143 * ax25_connect(): uses old (6 digipeater) socket structure. 1144 */ 1145 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || 1146 (addr_len > sizeof(struct full_sockaddr_ax25))) 1147 return -EINVAL; 1148 1149 1150 if (fsa->fsa_ax25.sax25_family != AF_AX25) 1151 return -EINVAL; 1152 1153 lock_sock(sk); 1154 1155 /* deal with restarts */ 1156 if (sock->state == SS_CONNECTING) { 1157 switch (sk->sk_state) { 1158 case TCP_SYN_SENT: /* still trying */ 1159 err = -EINPROGRESS; 1160 goto out_release; 1161 1162 case TCP_ESTABLISHED: /* connection established */ 1163 sock->state = SS_CONNECTED; 1164 goto out_release; 1165 1166 case TCP_CLOSE: /* connection refused */ 1167 sock->state = SS_UNCONNECTED; 1168 err = -ECONNREFUSED; 1169 goto out_release; 1170 } 1171 } 1172 1173 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) { 1174 err = -EISCONN; /* No reconnect on a seqpacket socket */ 1175 goto out_release; 1176 } 1177 1178 sk->sk_state = TCP_CLOSE; 1179 sock->state = SS_UNCONNECTED; 1180 1181 kfree(ax25->digipeat); 1182 ax25->digipeat = NULL; 1183 1184 /* 1185 * Handle digi-peaters to be used. 1186 */ 1187 if (addr_len > sizeof(struct sockaddr_ax25) && 1188 fsa->fsa_ax25.sax25_ndigis != 0) { 1189 /* Valid number of digipeaters ? */ 1190 if (fsa->fsa_ax25.sax25_ndigis < 1 || 1191 fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS || 1192 addr_len < sizeof(struct sockaddr_ax25) + 1193 sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) { 1194 err = -EINVAL; 1195 goto out_release; 1196 } 1197 1198 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) { 1199 err = -ENOBUFS; 1200 goto out_release; 1201 } 1202 1203 digi->ndigi = fsa->fsa_ax25.sax25_ndigis; 1204 digi->lastrepeat = -1; 1205 1206 while (ct < fsa->fsa_ax25.sax25_ndigis) { 1207 if ((fsa->fsa_digipeater[ct].ax25_call[6] & 1208 AX25_HBIT) && ax25->iamdigi) { 1209 digi->repeated[ct] = 1; 1210 digi->lastrepeat = ct; 1211 } else { 1212 digi->repeated[ct] = 0; 1213 } 1214 digi->calls[ct] = fsa->fsa_digipeater[ct]; 1215 ct++; 1216 } 1217 } 1218 1219 /* 1220 * Must bind first - autobinding in this may or may not work. If 1221 * the socket is already bound, check to see if the device has 1222 * been filled in, error if it hasn't. 1223 */ 1224 if (sock_flag(sk, SOCK_ZAPPED)) { 1225 /* check if we can remove this feature. It is broken. */ 1226 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n", 1227 current->comm); 1228 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) { 1229 kfree(digi); 1230 goto out_release; 1231 } 1232 1233 ax25_fillin_cb(ax25, ax25->ax25_dev); 1234 ax25_cb_add(ax25); 1235 } else { 1236 if (ax25->ax25_dev == NULL) { 1237 kfree(digi); 1238 err = -EHOSTUNREACH; 1239 goto out_release; 1240 } 1241 } 1242 1243 if (sk->sk_type == SOCK_SEQPACKET && 1244 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi, 1245 ax25->ax25_dev->dev))) { 1246 kfree(digi); 1247 err = -EADDRINUSE; /* Already such a connection */ 1248 ax25_cb_put(ax25t); 1249 goto out_release; 1250 } 1251 1252 ax25->dest_addr = fsa->fsa_ax25.sax25_call; 1253 ax25->digipeat = digi; 1254 1255 /* First the easy one */ 1256 if (sk->sk_type != SOCK_SEQPACKET) { 1257 sock->state = SS_CONNECTED; 1258 sk->sk_state = TCP_ESTABLISHED; 1259 goto out_release; 1260 } 1261 1262 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */ 1263 sock->state = SS_CONNECTING; 1264 sk->sk_state = TCP_SYN_SENT; 1265 1266 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { 1267 case AX25_PROTO_STD_SIMPLEX: 1268 case AX25_PROTO_STD_DUPLEX: 1269 ax25_std_establish_data_link(ax25); 1270 break; 1271 1272 #ifdef CONFIG_AX25_DAMA_SLAVE 1273 case AX25_PROTO_DAMA_SLAVE: 1274 ax25->modulus = AX25_MODULUS; 1275 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; 1276 if (ax25->ax25_dev->dama.slave) 1277 ax25_ds_establish_data_link(ax25); 1278 else 1279 ax25_std_establish_data_link(ax25); 1280 break; 1281 #endif 1282 } 1283 1284 ax25->state = AX25_STATE_1; 1285 1286 ax25_start_heartbeat(ax25); 1287 1288 /* Now the loop */ 1289 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 1290 err = -EINPROGRESS; 1291 goto out_release; 1292 } 1293 1294 if (sk->sk_state == TCP_SYN_SENT) { 1295 DEFINE_WAIT(wait); 1296 1297 for (;;) { 1298 prepare_to_wait(sk_sleep(sk), &wait, 1299 TASK_INTERRUPTIBLE); 1300 if (sk->sk_state != TCP_SYN_SENT) 1301 break; 1302 if (!signal_pending(current)) { 1303 release_sock(sk); 1304 schedule(); 1305 lock_sock(sk); 1306 continue; 1307 } 1308 err = -ERESTARTSYS; 1309 break; 1310 } 1311 finish_wait(sk_sleep(sk), &wait); 1312 1313 if (err) 1314 goto out_release; 1315 } 1316 1317 if (sk->sk_state != TCP_ESTABLISHED) { 1318 /* Not in ABM, not in WAIT_UA -> failed */ 1319 sock->state = SS_UNCONNECTED; 1320 err = sock_error(sk); /* Always set at this point */ 1321 goto out_release; 1322 } 1323 1324 sock->state = SS_CONNECTED; 1325 1326 err = 0; 1327 out_release: 1328 release_sock(sk); 1329 1330 return err; 1331 } 1332 1333 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags, 1334 bool kern) 1335 { 1336 struct sk_buff *skb; 1337 struct sock *newsk; 1338 DEFINE_WAIT(wait); 1339 struct sock *sk; 1340 int err = 0; 1341 1342 if (sock->state != SS_UNCONNECTED) 1343 return -EINVAL; 1344 1345 if ((sk = sock->sk) == NULL) 1346 return -EINVAL; 1347 1348 lock_sock(sk); 1349 if (sk->sk_type != SOCK_SEQPACKET) { 1350 err = -EOPNOTSUPP; 1351 goto out; 1352 } 1353 1354 if (sk->sk_state != TCP_LISTEN) { 1355 err = -EINVAL; 1356 goto out; 1357 } 1358 1359 /* 1360 * The read queue this time is holding sockets ready to use 1361 * hooked into the SABM we saved 1362 */ 1363 for (;;) { 1364 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1365 skb = skb_dequeue(&sk->sk_receive_queue); 1366 if (skb) 1367 break; 1368 1369 if (flags & O_NONBLOCK) { 1370 err = -EWOULDBLOCK; 1371 break; 1372 } 1373 if (!signal_pending(current)) { 1374 release_sock(sk); 1375 schedule(); 1376 lock_sock(sk); 1377 continue; 1378 } 1379 err = -ERESTARTSYS; 1380 break; 1381 } 1382 finish_wait(sk_sleep(sk), &wait); 1383 1384 if (err) 1385 goto out; 1386 1387 newsk = skb->sk; 1388 sock_graft(newsk, newsock); 1389 1390 /* Now attach up the new socket */ 1391 kfree_skb(skb); 1392 sk_acceptq_removed(sk); 1393 newsock->state = SS_CONNECTED; 1394 1395 out: 1396 release_sock(sk); 1397 1398 return err; 1399 } 1400 1401 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, 1402 int peer) 1403 { 1404 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; 1405 struct sock *sk = sock->sk; 1406 unsigned char ndigi, i; 1407 ax25_cb *ax25; 1408 int err = 0; 1409 1410 memset(fsa, 0, sizeof(*fsa)); 1411 lock_sock(sk); 1412 ax25 = sk_to_ax25(sk); 1413 1414 if (peer != 0) { 1415 if (sk->sk_state != TCP_ESTABLISHED) { 1416 err = -ENOTCONN; 1417 goto out; 1418 } 1419 1420 fsa->fsa_ax25.sax25_family = AF_AX25; 1421 fsa->fsa_ax25.sax25_call = ax25->dest_addr; 1422 1423 if (ax25->digipeat != NULL) { 1424 ndigi = ax25->digipeat->ndigi; 1425 fsa->fsa_ax25.sax25_ndigis = ndigi; 1426 for (i = 0; i < ndigi; i++) 1427 fsa->fsa_digipeater[i] = 1428 ax25->digipeat->calls[i]; 1429 } 1430 } else { 1431 fsa->fsa_ax25.sax25_family = AF_AX25; 1432 fsa->fsa_ax25.sax25_call = ax25->source_addr; 1433 fsa->fsa_ax25.sax25_ndigis = 1; 1434 if (ax25->ax25_dev != NULL) { 1435 memcpy(&fsa->fsa_digipeater[0], 1436 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN); 1437 } else { 1438 fsa->fsa_digipeater[0] = null_ax25_address; 1439 } 1440 } 1441 err = sizeof (struct full_sockaddr_ax25); 1442 1443 out: 1444 release_sock(sk); 1445 1446 return err; 1447 } 1448 1449 static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1450 { 1451 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); 1452 struct sock *sk = sock->sk; 1453 struct sockaddr_ax25 sax; 1454 struct sk_buff *skb; 1455 ax25_digi dtmp, *dp; 1456 ax25_cb *ax25; 1457 size_t size; 1458 int lv, err, addr_len = msg->msg_namelen; 1459 1460 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1461 return -EINVAL; 1462 1463 lock_sock(sk); 1464 ax25 = sk_to_ax25(sk); 1465 1466 if (sock_flag(sk, SOCK_ZAPPED)) { 1467 err = -EADDRNOTAVAIL; 1468 goto out; 1469 } 1470 1471 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1472 send_sig(SIGPIPE, current, 0); 1473 err = -EPIPE; 1474 goto out; 1475 } 1476 1477 if (ax25->ax25_dev == NULL) { 1478 err = -ENETUNREACH; 1479 goto out; 1480 } 1481 1482 if (len > ax25->ax25_dev->dev->mtu) { 1483 err = -EMSGSIZE; 1484 goto out; 1485 } 1486 1487 if (usax != NULL) { 1488 if (usax->sax25_family != AF_AX25) { 1489 err = -EINVAL; 1490 goto out; 1491 } 1492 1493 if (addr_len == sizeof(struct sockaddr_ax25)) 1494 /* ax25_sendmsg(): uses obsolete socket structure */ 1495 ; 1496 else if (addr_len != sizeof(struct full_sockaddr_ax25)) 1497 /* support for old structure may go away some time 1498 * ax25_sendmsg(): uses old (6 digipeater) 1499 * socket structure. 1500 */ 1501 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || 1502 (addr_len > sizeof(struct full_sockaddr_ax25))) { 1503 err = -EINVAL; 1504 goto out; 1505 } 1506 1507 1508 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) { 1509 int ct = 0; 1510 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax; 1511 1512 /* Valid number of digipeaters ? */ 1513 if (usax->sax25_ndigis < 1 || 1514 usax->sax25_ndigis > AX25_MAX_DIGIS || 1515 addr_len < sizeof(struct sockaddr_ax25) + 1516 sizeof(ax25_address) * usax->sax25_ndigis) { 1517 err = -EINVAL; 1518 goto out; 1519 } 1520 1521 dtmp.ndigi = usax->sax25_ndigis; 1522 1523 while (ct < usax->sax25_ndigis) { 1524 dtmp.repeated[ct] = 0; 1525 dtmp.calls[ct] = fsa->fsa_digipeater[ct]; 1526 ct++; 1527 } 1528 1529 dtmp.lastrepeat = 0; 1530 } 1531 1532 sax = *usax; 1533 if (sk->sk_type == SOCK_SEQPACKET && 1534 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) { 1535 err = -EISCONN; 1536 goto out; 1537 } 1538 if (usax->sax25_ndigis == 0) 1539 dp = NULL; 1540 else 1541 dp = &dtmp; 1542 } else { 1543 /* 1544 * FIXME: 1003.1g - if the socket is like this because 1545 * it has become closed (not started closed) and is VC 1546 * we ought to SIGPIPE, EPIPE 1547 */ 1548 if (sk->sk_state != TCP_ESTABLISHED) { 1549 err = -ENOTCONN; 1550 goto out; 1551 } 1552 sax.sax25_family = AF_AX25; 1553 sax.sax25_call = ax25->dest_addr; 1554 dp = ax25->digipeat; 1555 } 1556 1557 /* Build a packet */ 1558 /* Assume the worst case */ 1559 size = len + ax25->ax25_dev->dev->hard_header_len; 1560 1561 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err); 1562 if (skb == NULL) 1563 goto out; 1564 1565 skb_reserve(skb, size - len); 1566 1567 /* User data follows immediately after the AX.25 data */ 1568 if (memcpy_from_msg(skb_put(skb, len), msg, len)) { 1569 err = -EFAULT; 1570 kfree_skb(skb); 1571 goto out; 1572 } 1573 1574 skb_reset_network_header(skb); 1575 1576 /* Add the PID if one is not supplied by the user in the skb */ 1577 if (!ax25->pidincl) 1578 *(u8 *)skb_push(skb, 1) = sk->sk_protocol; 1579 1580 if (sk->sk_type == SOCK_SEQPACKET) { 1581 /* Connected mode sockets go via the LAPB machine */ 1582 if (sk->sk_state != TCP_ESTABLISHED) { 1583 kfree_skb(skb); 1584 err = -ENOTCONN; 1585 goto out; 1586 } 1587 1588 /* Shove it onto the queue and kick */ 1589 ax25_output(ax25, ax25->paclen, skb); 1590 1591 err = len; 1592 goto out; 1593 } 1594 1595 skb_push(skb, 1 + ax25_addr_size(dp)); 1596 1597 /* Building AX.25 Header */ 1598 1599 /* Build an AX.25 header */ 1600 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call, 1601 dp, AX25_COMMAND, AX25_MODULUS); 1602 1603 skb_set_transport_header(skb, lv); 1604 1605 *skb_transport_header(skb) = AX25_UI; 1606 1607 /* Datagram frames go straight out of the door as UI */ 1608 ax25_queue_xmit(skb, ax25->ax25_dev->dev); 1609 1610 err = len; 1611 1612 out: 1613 release_sock(sk); 1614 1615 return err; 1616 } 1617 1618 static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1619 int flags) 1620 { 1621 struct sock *sk = sock->sk; 1622 struct sk_buff *skb; 1623 int copied; 1624 int err = 0; 1625 1626 lock_sock(sk); 1627 /* 1628 * This works for seqpacket too. The receiver has ordered the 1629 * queue for us! We do one quick check first though 1630 */ 1631 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) { 1632 err = -ENOTCONN; 1633 goto out; 1634 } 1635 1636 /* Now we can treat all alike */ 1637 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1638 flags & MSG_DONTWAIT, &err); 1639 if (skb == NULL) 1640 goto out; 1641 1642 if (!sk_to_ax25(sk)->pidincl) 1643 skb_pull(skb, 1); /* Remove PID */ 1644 1645 skb_reset_transport_header(skb); 1646 copied = skb->len; 1647 1648 if (copied > size) { 1649 copied = size; 1650 msg->msg_flags |= MSG_TRUNC; 1651 } 1652 1653 skb_copy_datagram_msg(skb, 0, msg, copied); 1654 1655 if (msg->msg_name) { 1656 ax25_digi digi; 1657 ax25_address src; 1658 const unsigned char *mac = skb_mac_header(skb); 1659 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); 1660 1661 memset(sax, 0, sizeof(struct full_sockaddr_ax25)); 1662 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL, 1663 &digi, NULL, NULL); 1664 sax->sax25_family = AF_AX25; 1665 /* We set this correctly, even though we may not let the 1666 application know the digi calls further down (because it 1667 did NOT ask to know them). This could get political... **/ 1668 sax->sax25_ndigis = digi.ndigi; 1669 sax->sax25_call = src; 1670 1671 if (sax->sax25_ndigis != 0) { 1672 int ct; 1673 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax; 1674 1675 for (ct = 0; ct < digi.ndigi; ct++) 1676 fsa->fsa_digipeater[ct] = digi.calls[ct]; 1677 } 1678 msg->msg_namelen = sizeof(struct full_sockaddr_ax25); 1679 } 1680 1681 skb_free_datagram(sk, skb); 1682 err = copied; 1683 1684 out: 1685 release_sock(sk); 1686 1687 return err; 1688 } 1689 1690 static int ax25_shutdown(struct socket *sk, int how) 1691 { 1692 /* FIXME - generate DM and RNR states */ 1693 return -EOPNOTSUPP; 1694 } 1695 1696 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1697 { 1698 struct sock *sk = sock->sk; 1699 void __user *argp = (void __user *)arg; 1700 int res = 0; 1701 1702 lock_sock(sk); 1703 switch (cmd) { 1704 case TIOCOUTQ: { 1705 long amount; 1706 1707 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1708 if (amount < 0) 1709 amount = 0; 1710 res = put_user(amount, (int __user *)argp); 1711 break; 1712 } 1713 1714 case TIOCINQ: { 1715 struct sk_buff *skb; 1716 long amount = 0L; 1717 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1718 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1719 amount = skb->len; 1720 res = put_user(amount, (int __user *) argp); 1721 break; 1722 } 1723 1724 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */ 1725 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */ 1726 case SIOCAX25GETUID: { 1727 struct sockaddr_ax25 sax25; 1728 if (copy_from_user(&sax25, argp, sizeof(sax25))) { 1729 res = -EFAULT; 1730 break; 1731 } 1732 res = ax25_uid_ioctl(cmd, &sax25); 1733 break; 1734 } 1735 1736 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */ 1737 long amount; 1738 if (!capable(CAP_NET_ADMIN)) { 1739 res = -EPERM; 1740 break; 1741 } 1742 if (get_user(amount, (long __user *)argp)) { 1743 res = -EFAULT; 1744 break; 1745 } 1746 if (amount < 0 || amount > AX25_NOUID_BLOCK) { 1747 res = -EINVAL; 1748 break; 1749 } 1750 ax25_uid_policy = amount; 1751 res = 0; 1752 break; 1753 } 1754 1755 case SIOCADDRT: 1756 case SIOCDELRT: 1757 case SIOCAX25OPTRT: 1758 if (!capable(CAP_NET_ADMIN)) { 1759 res = -EPERM; 1760 break; 1761 } 1762 res = ax25_rt_ioctl(cmd, argp); 1763 break; 1764 1765 case SIOCAX25CTLCON: 1766 if (!capable(CAP_NET_ADMIN)) { 1767 res = -EPERM; 1768 break; 1769 } 1770 res = ax25_ctl_ioctl(cmd, argp); 1771 break; 1772 1773 case SIOCAX25GETINFO: 1774 case SIOCAX25GETINFOOLD: { 1775 ax25_cb *ax25 = sk_to_ax25(sk); 1776 struct ax25_info_struct ax25_info; 1777 1778 ax25_info.t1 = ax25->t1 / HZ; 1779 ax25_info.t2 = ax25->t2 / HZ; 1780 ax25_info.t3 = ax25->t3 / HZ; 1781 ax25_info.idle = ax25->idle / (60 * HZ); 1782 ax25_info.n2 = ax25->n2; 1783 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ; 1784 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ; 1785 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ; 1786 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ); 1787 ax25_info.n2count = ax25->n2count; 1788 ax25_info.state = ax25->state; 1789 ax25_info.rcv_q = sk_rmem_alloc_get(sk); 1790 ax25_info.snd_q = sk_wmem_alloc_get(sk); 1791 ax25_info.vs = ax25->vs; 1792 ax25_info.vr = ax25->vr; 1793 ax25_info.va = ax25->va; 1794 ax25_info.vs_max = ax25->vs; /* reserved */ 1795 ax25_info.paclen = ax25->paclen; 1796 ax25_info.window = ax25->window; 1797 1798 /* old structure? */ 1799 if (cmd == SIOCAX25GETINFOOLD) { 1800 static int warned = 0; 1801 if (!warned) { 1802 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n", 1803 current->comm); 1804 warned=1; 1805 } 1806 1807 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) { 1808 res = -EFAULT; 1809 break; 1810 } 1811 } else { 1812 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) { 1813 res = -EINVAL; 1814 break; 1815 } 1816 } 1817 res = 0; 1818 break; 1819 } 1820 1821 case SIOCAX25ADDFWD: 1822 case SIOCAX25DELFWD: { 1823 struct ax25_fwd_struct ax25_fwd; 1824 if (!capable(CAP_NET_ADMIN)) { 1825 res = -EPERM; 1826 break; 1827 } 1828 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) { 1829 res = -EFAULT; 1830 break; 1831 } 1832 res = ax25_fwd_ioctl(cmd, &ax25_fwd); 1833 break; 1834 } 1835 1836 case SIOCGIFADDR: 1837 case SIOCSIFADDR: 1838 case SIOCGIFDSTADDR: 1839 case SIOCSIFDSTADDR: 1840 case SIOCGIFBRDADDR: 1841 case SIOCSIFBRDADDR: 1842 case SIOCGIFNETMASK: 1843 case SIOCSIFNETMASK: 1844 case SIOCGIFMETRIC: 1845 case SIOCSIFMETRIC: 1846 res = -EINVAL; 1847 break; 1848 1849 default: 1850 res = -ENOIOCTLCMD; 1851 break; 1852 } 1853 release_sock(sk); 1854 1855 return res; 1856 } 1857 1858 #ifdef CONFIG_PROC_FS 1859 1860 static void *ax25_info_start(struct seq_file *seq, loff_t *pos) 1861 __acquires(ax25_list_lock) 1862 { 1863 spin_lock_bh(&ax25_list_lock); 1864 return seq_hlist_start(&ax25_list, *pos); 1865 } 1866 1867 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos) 1868 { 1869 return seq_hlist_next(v, &ax25_list, pos); 1870 } 1871 1872 static void ax25_info_stop(struct seq_file *seq, void *v) 1873 __releases(ax25_list_lock) 1874 { 1875 spin_unlock_bh(&ax25_list_lock); 1876 } 1877 1878 static int ax25_info_show(struct seq_file *seq, void *v) 1879 { 1880 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node); 1881 char buf[11]; 1882 int k; 1883 1884 1885 /* 1886 * New format: 1887 * 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 1888 */ 1889 1890 seq_printf(seq, "%p %s %s%s ", 1891 ax25, 1892 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name, 1893 ax2asc(buf, &ax25->source_addr), 1894 ax25->iamdigi? "*":""); 1895 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr)); 1896 1897 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) { 1898 seq_printf(seq, ",%s%s", 1899 ax2asc(buf, &ax25->digipeat->calls[k]), 1900 ax25->digipeat->repeated[k]? "*":""); 1901 } 1902 1903 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d", 1904 ax25->state, 1905 ax25->vs, ax25->vr, ax25->va, 1906 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ, 1907 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ, 1908 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ, 1909 ax25_display_timer(&ax25->idletimer) / (60 * HZ), 1910 ax25->idle / (60 * HZ), 1911 ax25->n2count, ax25->n2, 1912 ax25->rtt / HZ, 1913 ax25->window, 1914 ax25->paclen); 1915 1916 if (ax25->sk != NULL) { 1917 seq_printf(seq, " %d %d %lu\n", 1918 sk_wmem_alloc_get(ax25->sk), 1919 sk_rmem_alloc_get(ax25->sk), 1920 sock_i_ino(ax25->sk)); 1921 } else { 1922 seq_puts(seq, " * * *\n"); 1923 } 1924 return 0; 1925 } 1926 1927 static const struct seq_operations ax25_info_seqops = { 1928 .start = ax25_info_start, 1929 .next = ax25_info_next, 1930 .stop = ax25_info_stop, 1931 .show = ax25_info_show, 1932 }; 1933 #endif 1934 1935 static const struct net_proto_family ax25_family_ops = { 1936 .family = PF_AX25, 1937 .create = ax25_create, 1938 .owner = THIS_MODULE, 1939 }; 1940 1941 static const struct proto_ops ax25_proto_ops = { 1942 .family = PF_AX25, 1943 .owner = THIS_MODULE, 1944 .release = ax25_release, 1945 .bind = ax25_bind, 1946 .connect = ax25_connect, 1947 .socketpair = sock_no_socketpair, 1948 .accept = ax25_accept, 1949 .getname = ax25_getname, 1950 .poll = datagram_poll, 1951 .ioctl = ax25_ioctl, 1952 .gettstamp = sock_gettstamp, 1953 .listen = ax25_listen, 1954 .shutdown = ax25_shutdown, 1955 .setsockopt = ax25_setsockopt, 1956 .getsockopt = ax25_getsockopt, 1957 .sendmsg = ax25_sendmsg, 1958 .recvmsg = ax25_recvmsg, 1959 .mmap = sock_no_mmap, 1960 .sendpage = sock_no_sendpage, 1961 }; 1962 1963 /* 1964 * Called by socket.c on kernel start up 1965 */ 1966 static struct packet_type ax25_packet_type __read_mostly = { 1967 .type = cpu_to_be16(ETH_P_AX25), 1968 .func = ax25_kiss_rcv, 1969 }; 1970 1971 static struct notifier_block ax25_dev_notifier = { 1972 .notifier_call = ax25_device_event, 1973 }; 1974 1975 static int __init ax25_init(void) 1976 { 1977 int rc = proto_register(&ax25_proto, 0); 1978 1979 if (rc != 0) 1980 goto out; 1981 1982 sock_register(&ax25_family_ops); 1983 dev_add_pack(&ax25_packet_type); 1984 register_netdevice_notifier(&ax25_dev_notifier); 1985 1986 proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops); 1987 proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops); 1988 proc_create_seq("ax25_calls", 0444, init_net.proc_net, 1989 &ax25_uid_seqops); 1990 out: 1991 return rc; 1992 } 1993 module_init(ax25_init); 1994 1995 1996 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1997 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol"); 1998 MODULE_LICENSE("GPL"); 1999 MODULE_ALIAS_NETPROTO(PF_AX25); 2000 2001 static void __exit ax25_exit(void) 2002 { 2003 remove_proc_entry("ax25_route", init_net.proc_net); 2004 remove_proc_entry("ax25", init_net.proc_net); 2005 remove_proc_entry("ax25_calls", init_net.proc_net); 2006 2007 unregister_netdevice_notifier(&ax25_dev_notifier); 2008 2009 dev_remove_pack(&ax25_packet_type); 2010 2011 sock_unregister(PF_AX25); 2012 proto_unregister(&ax25_proto); 2013 2014 ax25_rt_free(); 2015 ax25_uid_free(); 2016 ax25_dev_free(); 2017 } 2018 module_exit(ax25_exit); 2019