af_netrom.c 32.6 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
13
#include <linux/capability.h>
Linus Torvalds's avatar
Linus Torvalds committed
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/stat.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
30
#include <net/net_namespace.h>
Linus Torvalds's avatar
Linus Torvalds committed
31 32 33 34 35 36 37 38 39 40 41 42
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/termios.h>	/* For TIOCINQ/OUTQ */
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <net/netrom.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <net/ip.h>
43
#include <net/tcp_states.h>
Linus Torvalds's avatar
Linus Torvalds committed
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
#include <net/arp.h>
#include <linux/init.h>

static int nr_ndevs = 4;

int sysctl_netrom_default_path_quality            = NR_DEFAULT_QUAL;
int sysctl_netrom_obsolescence_count_initialiser  = NR_DEFAULT_OBS;
int sysctl_netrom_network_ttl_initialiser         = NR_DEFAULT_TTL;
int sysctl_netrom_transport_timeout               = NR_DEFAULT_T1;
int sysctl_netrom_transport_maximum_tries         = NR_DEFAULT_N2;
int sysctl_netrom_transport_acknowledge_delay     = NR_DEFAULT_T2;
int sysctl_netrom_transport_busy_delay            = NR_DEFAULT_T4;
int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
int sysctl_netrom_transport_no_activity_timeout   = NR_DEFAULT_IDLE;
int sysctl_netrom_routing_control                 = NR_DEFAULT_ROUTING;
int sysctl_netrom_link_fails_count                = NR_DEFAULT_FAILS;
60
int sysctl_netrom_reset_circuit                   = NR_DEFAULT_RESET;
Linus Torvalds's avatar
Linus Torvalds committed
61 62 63 64 65 66

static unsigned short circuit = 0x101;

static HLIST_HEAD(nr_list);
static DEFINE_SPINLOCK(nr_list_lock);

67
static const struct proto_ops nr_proto_ops;
Linus Torvalds's avatar
Linus Torvalds committed
68

69 70 71 72 73 74 75 76
/*
 * NETROM network devices are virtual network devices encapsulating NETROM
 * frames into AX.25 which will be sent through an AX.25 device, so form a
 * special "super class" of normal net devices; split their locks off into a
 * separate class since they always nest.
 */
static struct lock_class_key nr_netdev_xmit_lock_key;

77 78 79 80 81 82 83 84 85 86
static void nr_set_lockdep_one(struct netdev_queue *txq)
{
	lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
}

static void nr_set_lockdep_key(struct net_device *dev)
{
	nr_set_lockdep_one(&dev->tx_queue);
}

Linus Torvalds's avatar
Linus Torvalds committed
87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
/*
 *	Socket removal during an interrupt is now safe.
 */
static void nr_remove_socket(struct sock *sk)
{
	spin_lock_bh(&nr_list_lock);
	sk_del_node_init(sk);
	spin_unlock_bh(&nr_list_lock);
}

/*
 *	Kill all bound sockets on a dropped device.
 */
static void nr_kill_by_device(struct net_device *dev)
{
	struct sock *s;
	struct hlist_node *node;

	spin_lock_bh(&nr_list_lock);
	sk_for_each(s, node, &nr_list)
		if (nr_sk(s)->device == dev)
			nr_disconnect(s, ENETUNREACH);
	spin_unlock_bh(&nr_list_lock);
}

/*
 *	Handle device status changes.
 */
static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = (struct net_device *)ptr;

119
	if (dev_net(dev) != &init_net)
120 121
		return NOTIFY_DONE;

Linus Torvalds's avatar
Linus Torvalds committed
122 123 124 125 126
	if (event != NETDEV_DOWN)
		return NOTIFY_DONE;

	nr_kill_by_device(dev);
	nr_rt_device_down(dev);
127

Linus Torvalds's avatar
Linus Torvalds committed
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153
	return NOTIFY_DONE;
}

/*
 *	Add a socket to the bound sockets list.
 */
static void nr_insert_socket(struct sock *sk)
{
	spin_lock_bh(&nr_list_lock);
	sk_add_node(sk, &nr_list);
	spin_unlock_bh(&nr_list_lock);
}

/*
 *	Find a socket that wants to accept the Connect Request we just
 *	received.
 */
static struct sock *nr_find_listener(ax25_address *addr)
{
	struct sock *s;
	struct hlist_node *node;

	spin_lock_bh(&nr_list_lock);
	sk_for_each(s, node, &nr_list)
		if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
		    s->sk_state == TCP_LISTEN) {
154
			bh_lock_sock(s);
Linus Torvalds's avatar
Linus Torvalds committed
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173
			goto found;
		}
	s = NULL;
found:
	spin_unlock_bh(&nr_list_lock);
	return s;
}

/*
 *	Find a connected NET/ROM socket given my circuit IDs.
 */
static struct sock *nr_find_socket(unsigned char index, unsigned char id)
{
	struct sock *s;
	struct hlist_node *node;

	spin_lock_bh(&nr_list_lock);
	sk_for_each(s, node, &nr_list) {
		struct nr_sock *nr = nr_sk(s);
174

Linus Torvalds's avatar
Linus Torvalds committed
175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
		if (nr->my_index == index && nr->my_id == id) {
			bh_lock_sock(s);
			goto found;
		}
	}
	s = NULL;
found:
	spin_unlock_bh(&nr_list_lock);
	return s;
}

/*
 *	Find a connected NET/ROM socket given their circuit IDs.
 */
static struct sock *nr_find_peer(unsigned char index, unsigned char id,
	ax25_address *dest)
{
	struct sock *s;
	struct hlist_node *node;

	spin_lock_bh(&nr_list_lock);
	sk_for_each(s, node, &nr_list) {
		struct nr_sock *nr = nr_sk(s);
198

Linus Torvalds's avatar
Linus Torvalds committed
199 200
		if (nr->your_index == index && nr->your_id == id &&
		    !ax25cmp(&nr->dest_addr, dest)) {
201
			bh_lock_sock(s);
Linus Torvalds's avatar
Linus Torvalds committed
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
			goto found;
		}
	}
	s = NULL;
found:
	spin_unlock_bh(&nr_list_lock);
	return s;
}

/*
 *	Find next free circuit ID.
 */
static unsigned short nr_find_next_circuit(void)
{
	unsigned short id = circuit;
	unsigned char i, j;
	struct sock *sk;

	for (;;) {
		i = id / 256;
		j = id % 256;

		if (i != 0 && j != 0) {
			if ((sk=nr_find_socket(i, j)) == NULL)
				break;
			bh_unlock_sock(sk);
		}

		id++;
	}

	return id;
}

/*
 *	Deferred destroy.
 */
void nr_destroy_socket(struct sock *);

/*
 *	Handler for deferred kills.
 */
static void nr_destroy_timer(unsigned long data)
{
	struct sock *sk=(struct sock *)data;
	bh_lock_sock(sk);
	sock_hold(sk);
	nr_destroy_socket(sk);
	bh_unlock_sock(sk);
	sock_put(sk);
}

/*
 *	This is called from user mode and the timers. Thus it protects itself
 *	against interrupt users but doesn't worry about being called during
 *	work. Once it is removed from the queue no interrupt or bottom half
 *	will touch it and we are (fairly 8-) ) safe.
 */
void nr_destroy_socket(struct sock *sk)
{
	struct sk_buff *skb;

	nr_remove_socket(sk);

	nr_stop_heartbeat(sk);
	nr_stop_t1timer(sk);
	nr_stop_t2timer(sk);
	nr_stop_t4timer(sk);
	nr_stop_idletimer(sk);

	nr_clear_queues(sk);		/* Flush the queues */

	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
		if (skb->sk != sk) { /* A pending connection */
			/* Queue the unaccepted socket for death */
			sock_set_flag(skb->sk, SOCK_DEAD);
			nr_start_heartbeat(skb->sk);
			nr_sk(skb->sk)->state = NR_STATE_0;
		}

		kfree_skb(skb);
	}

	if (atomic_read(&sk->sk_wmem_alloc) ||
	    atomic_read(&sk->sk_rmem_alloc)) {
		/* Defer: outstanding buffers */
		sk->sk_timer.function = nr_destroy_timer;
		sk->sk_timer.expires  = jiffies + 2 * HZ;
		add_timer(&sk->sk_timer);
	} else
		sock_put(sk);
}

/*
 *	Handling for system calls applied via the various interfaces to a
 *	NET/ROM socket object.
 */

static int nr_setsockopt(struct socket *sock, int level, int optname,
	char __user *optval, int optlen)
{
	struct sock *sk = sock->sk;
	struct nr_sock *nr = nr_sk(sk);
	int opt;

	if (level != SOL_NETROM)
		return -ENOPROTOOPT;

	if (optlen < sizeof(int))
		return -EINVAL;

	if (get_user(opt, (int __user *)optval))
		return -EFAULT;

	switch (optname) {
	case NETROM_T1:
		if (opt < 1)
			return -EINVAL;
		nr->t1 = opt * HZ;
		return 0;

	case NETROM_T2:
		if (opt < 1)
			return -EINVAL;
		nr->t2 = opt * HZ;
		return 0;

	case NETROM_N2:
		if (opt < 1 || opt > 31)
			return -EINVAL;
		nr->n2 = opt;
		return 0;

	case NETROM_T4:
		if (opt < 1)
			return -EINVAL;
		nr->t4 = opt * HZ;
		return 0;

	case NETROM_IDLE:
		if (opt < 0)
			return -EINVAL;
		nr->idle = opt * 60 * HZ;
		return 0;

	default:
		return -ENOPROTOOPT;
	}
}

static int nr_getsockopt(struct socket *sock, int level, int optname,
	char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	struct nr_sock *nr = nr_sk(sk);
	int val = 0;
358
	int len;
Linus Torvalds's avatar
Linus Torvalds committed
359 360 361

	if (level != SOL_NETROM)
		return -ENOPROTOOPT;
362

Linus Torvalds's avatar
Linus Torvalds committed
363 364 365 366 367
	if (get_user(len, optlen))
		return -EFAULT;

	if (len < 0)
		return -EINVAL;
368

Linus Torvalds's avatar
Linus Torvalds committed
369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424
	switch (optname) {
	case NETROM_T1:
		val = nr->t1 / HZ;
		break;

	case NETROM_T2:
		val = nr->t2 / HZ;
		break;

	case NETROM_N2:
		val = nr->n2;
		break;

	case NETROM_T4:
		val = nr->t4 / HZ;
		break;

	case NETROM_IDLE:
		val = nr->idle / (60 * HZ);
		break;

	default:
		return -ENOPROTOOPT;
	}

	len = min_t(unsigned int, len, sizeof(int));

	if (put_user(len, optlen))
		return -EFAULT;

	return copy_to_user(optval, &val, len) ? -EFAULT : 0;
}

static int nr_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;

	lock_sock(sk);
	if (sk->sk_state != TCP_LISTEN) {
		memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
		sk->sk_max_ack_backlog = backlog;
		sk->sk_state           = TCP_LISTEN;
		release_sock(sk);
		return 0;
	}
	release_sock(sk);

	return -EOPNOTSUPP;
}

static struct proto nr_proto = {
	.name	  = "NETROM",
	.owner	  = THIS_MODULE,
	.obj_size = sizeof(struct nr_sock),
};

425
static int nr_create(struct net *net, struct socket *sock, int protocol)
Linus Torvalds's avatar
Linus Torvalds committed
426 427 428 429
{
	struct sock *sk;
	struct nr_sock *nr;

430 431 432
	if (net != &init_net)
		return -EAFNOSUPPORT;

Linus Torvalds's avatar
Linus Torvalds committed
433 434 435
	if (sock->type != SOCK_SEQPACKET || protocol != 0)
		return -ESOCKTNOSUPPORT;

436 437
	sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto);
	if (sk  == NULL)
Linus Torvalds's avatar
Linus Torvalds committed
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452
		return -ENOMEM;

	nr = nr_sk(sk);

	sock_init_data(sock, sk);

	sock->ops    = &nr_proto_ops;
	sk->sk_protocol = protocol;

	skb_queue_head_init(&nr->ack_queue);
	skb_queue_head_init(&nr->reseq_queue);
	skb_queue_head_init(&nr->frag_queue);

	nr_init_timers(sk);

453 454 455 456 457 458 459 460 461 462
	nr->t1     =
		msecs_to_jiffies(sysctl_netrom_transport_timeout);
	nr->t2     =
		msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
	nr->n2     =
		msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
	nr->t4     =
		msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
	nr->idle   =
		msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
Linus Torvalds's avatar
Linus Torvalds committed
463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478
	nr->window = sysctl_netrom_transport_requested_window_size;

	nr->bpqext = 1;
	nr->state  = NR_STATE_0;

	return 0;
}

static struct sock *nr_make_new(struct sock *osk)
{
	struct sock *sk;
	struct nr_sock *nr, *onr;

	if (osk->sk_type != SOCK_SEQPACKET)
		return NULL;

479
	sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot);
480
	if (sk == NULL)
Linus Torvalds's avatar
Linus Torvalds committed
481 482 483 484 485 486 487 488 489 490 491 492
		return NULL;

	nr = nr_sk(sk);

	sock_init_data(NULL, sk);

	sk->sk_type     = osk->sk_type;
	sk->sk_priority = osk->sk_priority;
	sk->sk_protocol = osk->sk_protocol;
	sk->sk_rcvbuf   = osk->sk_rcvbuf;
	sk->sk_sndbuf   = osk->sk_sndbuf;
	sk->sk_state    = TCP_ESTABLISHED;
Ralf Baechle's avatar
Ralf Baechle committed
493
	sock_copy_flags(sk, osk);
Linus Torvalds's avatar
Linus Torvalds committed
494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554

	skb_queue_head_init(&nr->ack_queue);
	skb_queue_head_init(&nr->reseq_queue);
	skb_queue_head_init(&nr->frag_queue);

	nr_init_timers(sk);

	onr = nr_sk(osk);

	nr->t1      = onr->t1;
	nr->t2      = onr->t2;
	nr->n2      = onr->n2;
	nr->t4      = onr->t4;
	nr->idle    = onr->idle;
	nr->window  = onr->window;

	nr->device  = onr->device;
	nr->bpqext  = onr->bpqext;

	return sk;
}

static int nr_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct nr_sock *nr;

	if (sk == NULL) return 0;

	sock_hold(sk);
	lock_sock(sk);
	nr = nr_sk(sk);

	switch (nr->state) {
	case NR_STATE_0:
	case NR_STATE_1:
	case NR_STATE_2:
		nr_disconnect(sk, 0);
		nr_destroy_socket(sk);
		break;

	case NR_STATE_3:
		nr_clear_queues(sk);
		nr->n2count = 0;
		nr_write_internal(sk, NR_DISCREQ);
		nr_start_t1timer(sk);
		nr_stop_t2timer(sk);
		nr_stop_t4timer(sk);
		nr_stop_idletimer(sk);
		nr->state    = NR_STATE_2;
		sk->sk_state    = TCP_CLOSE;
		sk->sk_shutdown |= SEND_SHUTDOWN;
		sk->sk_state_change(sk);
		sock_orphan(sk);
		sock_set_flag(sk, SOCK_DESTROY);
		break;

	default:
		break;
	}

555
	sock->sk   = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
556 557 558 559 560 561 562 563 564 565 566 567
	release_sock(sk);
	sock_put(sk);

	return 0;
}

static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
	struct sock *sk = sock->sk;
	struct nr_sock *nr = nr_sk(sk);
	struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
	struct net_device *dev;
Ralf Baechle's avatar
Ralf Baechle committed
568 569
	ax25_uid_assoc *user;
	ax25_address *source;
Linus Torvalds's avatar
Linus Torvalds committed
570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607

	lock_sock(sk);
	if (!sock_flag(sk, SOCK_ZAPPED)) {
		release_sock(sk);
		return -EINVAL;
	}
	if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
		release_sock(sk);
		return -EINVAL;
	}
	if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
		release_sock(sk);
		return -EINVAL;
	}
	if (addr->fsa_ax25.sax25_family != AF_NETROM) {
		release_sock(sk);
		return -EINVAL;
	}
	if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
		SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
		release_sock(sk);
		return -EADDRNOTAVAIL;
	}

	/*
	 * Only the super user can set an arbitrary user callsign.
	 */
	if (addr->fsa_ax25.sax25_ndigis == 1) {
		if (!capable(CAP_NET_BIND_SERVICE)) {
			dev_put(dev);
			release_sock(sk);
			return -EACCES;
		}
		nr->user_addr   = addr->fsa_digipeater[0];
		nr->source_addr = addr->fsa_ax25.sax25_call;
	} else {
		source = &addr->fsa_ax25.sax25_call;

Ralf Baechle's avatar
Ralf Baechle committed
608 609 610 611 612
		user = ax25_findbyuid(current->euid);
		if (user) {
			nr->user_addr   = user->call;
			ax25_uid_put(user);
		} else {
Linus Torvalds's avatar
Linus Torvalds committed
613 614 615 616 617
			if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
				release_sock(sk);
				dev_put(dev);
				return -EPERM;
			}
Ralf Baechle's avatar
Ralf Baechle committed
618
			nr->user_addr   = *source;
Linus Torvalds's avatar
Linus Torvalds committed
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
		}

		nr->source_addr = *source;
	}

	nr->device = dev;
	nr_insert_socket(sk);

	sock_reset_flag(sk, SOCK_ZAPPED);
	dev_put(dev);
	release_sock(sk);
	SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
	return 0;
}

static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
	int addr_len, int flags)
{
	struct sock *sk = sock->sk;
	struct nr_sock *nr = nr_sk(sk);
	struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
Ralf Baechle's avatar
Ralf Baechle committed
640 641
	ax25_address *source = NULL;
	ax25_uid_assoc *user;
Linus Torvalds's avatar
Linus Torvalds committed
642
	struct net_device *dev;
643
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
644 645 646 647

	lock_sock(sk);
	if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
		sock->state = SS_CONNECTED;
648
		goto out_release;	/* Connect completed during a ERESTARTSYS event */
Linus Torvalds's avatar
Linus Torvalds committed
649 650 651 652
	}

	if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
		sock->state = SS_UNCONNECTED;
653 654
		err = -ECONNREFUSED;
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
655 656 657
	}

	if (sk->sk_state == TCP_ESTABLISHED) {
658 659
		err = -EISCONN;	/* No reconnect on a seqpacket socket */
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
660 661
	}

662
	sk->sk_state   = TCP_CLOSE;
Linus Torvalds's avatar
Linus Torvalds committed
663 664 665
	sock->state = SS_UNCONNECTED;

	if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
666 667
		err = -EINVAL;
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
668 669
	}
	if (addr->sax25_family != AF_NETROM) {
670 671
		err = -EINVAL;
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
672 673 674 675 676
	}
	if (sock_flag(sk, SOCK_ZAPPED)) {	/* Must bind first - autobinding in this may or may not work */
		sock_reset_flag(sk, SOCK_ZAPPED);

		if ((dev = nr_dev_first()) == NULL) {
677 678
			err = -ENETUNREACH;
			goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
679 680 681
		}
		source = (ax25_address *)dev->dev_addr;

Ralf Baechle's avatar
Ralf Baechle committed
682 683 684 685 686
		user = ax25_findbyuid(current->euid);
		if (user) {
			nr->user_addr   = user->call;
			ax25_uid_put(user);
		} else {
Linus Torvalds's avatar
Linus Torvalds committed
687 688
			if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
				dev_put(dev);
689 690
				err = -EPERM;
				goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
691
			}
Ralf Baechle's avatar
Ralf Baechle committed
692
			nr->user_addr   = *source;
Linus Torvalds's avatar
Linus Torvalds committed
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724
		}

		nr->source_addr = *source;
		nr->device      = dev;

		dev_put(dev);
		nr_insert_socket(sk);		/* Finish the bind */
	}

	nr->dest_addr = addr->sax25_call;

	release_sock(sk);
	circuit = nr_find_next_circuit();
	lock_sock(sk);

	nr->my_index = circuit / 256;
	nr->my_id    = circuit % 256;

	circuit++;

	/* Move to connecting socket, start sending Connect Requests */
	sock->state  = SS_CONNECTING;
	sk->sk_state = TCP_SYN_SENT;

	nr_establish_data_link(sk);

	nr->state = NR_STATE_1;

	nr_start_heartbeat(sk);

	/* Now the loop */
	if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
725 726
		err = -EINPROGRESS;
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
727
	}
728

Linus Torvalds's avatar
Linus Torvalds committed
729 730 731 732 733
	/*
	 * A Connect Ack with Choke or timeout or failed routing will go to
	 * closed.
	 */
	if (sk->sk_state == TCP_SYN_SENT) {
734
		DEFINE_WAIT(wait);
Linus Torvalds's avatar
Linus Torvalds committed
735 736

		for (;;) {
737
			prepare_to_wait(sk->sk_sleep, &wait,
738
					TASK_INTERRUPTIBLE);
Linus Torvalds's avatar
Linus Torvalds committed
739 740
			if (sk->sk_state != TCP_SYN_SENT)
				break;
741 742
			if (!signal_pending(current)) {
				release_sock(sk);
Linus Torvalds's avatar
Linus Torvalds committed
743 744 745 746
				schedule();
				lock_sock(sk);
				continue;
			}
747 748
			err = -ERESTARTSYS;
			break;
Linus Torvalds's avatar
Linus Torvalds committed
749
		}
750 751 752
		finish_wait(sk->sk_sleep, &wait);
		if (err)
			goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
753 754 755 756
	}

	if (sk->sk_state != TCP_ESTABLISHED) {
		sock->state = SS_UNCONNECTED;
757 758
		err = sock_error(sk);	/* Always set at this point */
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
759 760 761
	}

	sock->state = SS_CONNECTED;
762 763

out_release:
Linus Torvalds's avatar
Linus Torvalds committed
764 765
	release_sock(sk);

766
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
767 768 769 770 771 772
}

static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
{
	struct sk_buff *skb;
	struct sock *newsk;
773
	DEFINE_WAIT(wait);
Linus Torvalds's avatar
Linus Torvalds committed
774 775 776 777 778 779 780 781 782
	struct sock *sk;
	int err = 0;

	if ((sk = sock->sk) == NULL)
		return -EINVAL;

	lock_sock(sk);
	if (sk->sk_type != SOCK_SEQPACKET) {
		err = -EOPNOTSUPP;
783
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
784 785 786 787
	}

	if (sk->sk_state != TCP_LISTEN) {
		err = -EINVAL;
788
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
789 790 791 792 793 794 795
	}

	/*
	 *	The write queue this time is holding sockets ready to use
	 *	hooked into the SABM we saved
	 */
	for (;;) {
796
		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
Linus Torvalds's avatar
Linus Torvalds committed
797 798 799 800 801
		skb = skb_dequeue(&sk->sk_receive_queue);
		if (skb)
			break;

		if (flags & O_NONBLOCK) {
802 803
			err = -EWOULDBLOCK;
			break;
Linus Torvalds's avatar
Linus Torvalds committed
804
		}
805 806
		if (!signal_pending(current)) {
			release_sock(sk);
Linus Torvalds's avatar
Linus Torvalds committed
807 808 809 810
			schedule();
			lock_sock(sk);
			continue;
		}
811 812
		err = -ERESTARTSYS;
		break;
Linus Torvalds's avatar
Linus Torvalds committed
813
	}
814 815 816
	finish_wait(sk->sk_sleep, &wait);
	if (err)
		goto out_release;
Linus Torvalds's avatar
Linus Torvalds committed
817 818

	newsk = skb->sk;
819
	sock_graft(newsk, newsock);
Linus Torvalds's avatar
Linus Torvalds committed
820 821 822

	/* Now attach up the new socket */
	kfree_skb(skb);
823
	sk_acceptq_removed(sk);
Linus Torvalds's avatar
Linus Torvalds committed
824

825
out_release:
Linus Torvalds's avatar
Linus Torvalds committed
826
	release_sock(sk);
827

Linus Torvalds's avatar
Linus Torvalds committed
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862
	return err;
}

static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
	int *uaddr_len, int peer)
{
	struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
	struct sock *sk = sock->sk;
	struct nr_sock *nr = nr_sk(sk);

	lock_sock(sk);
	if (peer != 0) {
		if (sk->sk_state != TCP_ESTABLISHED) {
			release_sock(sk);
			return -ENOTCONN;
		}
		sax->fsa_ax25.sax25_family = AF_NETROM;
		sax->fsa_ax25.sax25_ndigis = 1;
		sax->fsa_ax25.sax25_call   = nr->user_addr;
		sax->fsa_digipeater[0]     = nr->dest_addr;
		*uaddr_len = sizeof(struct full_sockaddr_ax25);
	} else {
		sax->fsa_ax25.sax25_family = AF_NETROM;
		sax->fsa_ax25.sax25_ndigis = 0;
		sax->fsa_ax25.sax25_call   = nr->source_addr;
		*uaddr_len = sizeof(struct sockaddr_ax25);
	}
	release_sock(sk);

	return 0;
}

int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
{
	struct sock *sk;
863
	struct sock *make;
Linus Torvalds's avatar
Linus Torvalds committed
864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
	struct nr_sock *nr_make;
	ax25_address *src, *dest, *user;
	unsigned short circuit_index, circuit_id;
	unsigned short peer_circuit_index, peer_circuit_id;
	unsigned short frametype, flags, window, timeout;
	int ret;

	skb->sk = NULL;		/* Initially we don't know who it's for */

	/*
	 *	skb->data points to the netrom frame start
	 */

	src  = (ax25_address *)(skb->data + 0);
	dest = (ax25_address *)(skb->data + 7);

	circuit_index      = skb->data[15];
	circuit_id         = skb->data[16];
	peer_circuit_index = skb->data[17];
	peer_circuit_id    = skb->data[18];
	frametype          = skb->data[19] & 0x0F;
	flags              = skb->data[19] & 0xF0;

	/*
	 * Check for an incoming IP over NET/ROM frame.
	 */
890 891
	if (frametype == NR_PROTOEXT &&
	    circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
Linus Torvalds's avatar
Linus Torvalds committed
892
		skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
893
		skb_reset_transport_header(skb);
Linus Torvalds's avatar
Linus Torvalds committed
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918

		return nr_rx_ip(skb, dev);
	}

	/*
	 * Find an existing socket connection, based on circuit ID, if it's
	 * a Connect Request base it on their circuit ID.
	 *
	 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
	 * circuit that no longer exists at the other end ...
	 */

	sk = NULL;

	if (circuit_index == 0 && circuit_id == 0) {
		if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
			sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
	} else {
		if (frametype == NR_CONNREQ)
			sk = nr_find_peer(circuit_index, circuit_id, src);
		else
			sk = nr_find_socket(circuit_index, circuit_id);
	}

	if (sk != NULL) {
919
		skb_reset_transport_header(skb);
Linus Torvalds's avatar
Linus Torvalds committed
920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936

		if (frametype == NR_CONNACK && skb->len == 22)
			nr_sk(sk)->bpqext = 1;
		else
			nr_sk(sk)->bpqext = 0;

		ret = nr_process_rx_frame(sk, skb);
		bh_unlock_sock(sk);
		return ret;
	}

	/*
	 * Now it should be a CONNREQ.
	 */
	if (frametype != NR_CONNREQ) {
		/*
		 * Here it would be nice to be able to send a reset but
937 938 939 940 941 942
		 * NET/ROM doesn't have one.  We've tried to extend the protocol
		 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
		 * apparently kills BPQ boxes... :-(
		 * So now we try to follow the established behaviour of
		 * G8PZT's Xrouter which is sending packets with command type 7
		 * as an extension of the protocol.
Linus Torvalds's avatar
Linus Torvalds committed
943
		 */
944 945 946 947
		if (sysctl_netrom_reset_circuit &&
		    (frametype != NR_RESET || flags != 0))
			nr_transmit_reset(skb, 1);

Linus Torvalds's avatar
Linus Torvalds committed
948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
		return 0;
	}

	sk = nr_find_listener(dest);

	user = (ax25_address *)(skb->data + 21);

	if (sk == NULL || sk_acceptq_is_full(sk) ||
	    (make = nr_make_new(sk)) == NULL) {
		nr_transmit_refusal(skb, 0);
		if (sk)
			bh_unlock_sock(sk);
		return 0;
	}

	window = skb->data[20];

	skb->sk             = make;
	make->sk_state	    = TCP_ESTABLISHED;

	/* Fill in his circuit details */
	nr_make = nr_sk(make);
	nr_make->source_addr = *dest;
	nr_make->dest_addr   = *src;
	nr_make->user_addr   = *user;

	nr_make->your_index  = circuit_index;
	nr_make->your_id     = circuit_id;

	bh_unlock_sock(sk);
	circuit = nr_find_next_circuit();
	bh_lock_sock(sk);

	nr_make->my_index    = circuit / 256;
	nr_make->my_id       = circuit % 256;

	circuit++;

	/* Window negotiation */
	if (window < nr_make->window)
		nr_make->window = window;

	/* L4 timeout negotiation */
	if (skb->len == 37) {
		timeout = skb->data[36] * 256 + skb->data[35];
		if (timeout * HZ < nr_make->t1)
			nr_make->t1 = timeout * HZ;
		nr_make->bpqext = 1;
	} else {
		nr_make->bpqext = 0;
	}

	nr_write_internal(make, NR_CONNACK);

	nr_make->condition = 0x00;
	nr_make->vs        = 0;
	nr_make->va        = 0;
	nr_make->vr        = 0;
	nr_make->vl        = 0;
	nr_make->state     = NR_STATE_3;
1008
	sk_acceptq_added(sk);
Linus Torvalds's avatar
Linus Torvalds committed
1009 1010 1011 1012 1013 1014
	skb_queue_head(&sk->sk_receive_queue, skb);

	if (!sock_flag(sk, SOCK_DEAD))
		sk->sk_data_ready(sk, skb->len);

	bh_unlock_sock(sk);
1015 1016 1017 1018 1019 1020

	nr_insert_socket(make);

	nr_start_heartbeat(make);
	nr_start_idletimer(make);

Linus Torvalds's avatar
Linus Torvalds committed
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	return 1;
}

static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
		      struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct nr_sock *nr = nr_sk(sk);
	struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
	int err;
	struct sockaddr_ax25 sax;
	struct sk_buff *skb;
	unsigned char *asmptr;
	int size;

	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
		return -EINVAL;

	lock_sock(sk);
	if (sock_flag(sk, SOCK_ZAPPED)) {
		err = -EADDRNOTAVAIL;
		goto out;
	}

	if (sk->sk_shutdown & SEND_SHUTDOWN) {
		send_sig(SIGPIPE, current, 0);
		err = -EPIPE;
		goto out;
	}

	if (nr->device == NULL) {
		err = -ENETUNREACH;
		goto out;
	}

	if (usax) {
		if (msg->msg_namelen < sizeof(sax)) {
			err = -EINVAL;
			goto out;
		}
		sax = *usax;
		if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
			err = -EISCONN;
			goto out;
		}
		if (sax.sax25_family != AF_NETROM) {
			err = -EINVAL;
			goto out;
		}
	} else {
		if (sk->sk_state != TCP_ESTABLISHED) {
			err = -ENOTCONN;
			goto out;
		}
		sax.sax25_family = AF_NETROM;
		sax.sax25_call   = nr->dest_addr;
	}

	SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");

	/* Build a packet */
	SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
	size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;

	if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
		goto out;

	skb_reserve(skb, size - len);
1089
	skb_reset_transport_header(skb);
Linus Torvalds's avatar
Linus Torvalds committed
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109

	/*
	 *	Push down the NET/ROM header
	 */

	asmptr = skb_push(skb, NR_TRANSPORT_LEN);
	SOCK_DEBUG(sk, "Building NET/ROM Header.\n");

	/* Build a NET/ROM Transport header */

	*asmptr++ = nr->your_index;
	*asmptr++ = nr->your_id;
	*asmptr++ = 0;		/* To be filled in later */
	*asmptr++ = 0;		/*      Ditto            */
	*asmptr++ = NR_INFO;
	SOCK_DEBUG(sk, "Built header.\n");

	/*
	 *	Put the data on the end
	 */
1110
	skb_put(skb, len);
Linus Torvalds's avatar
Linus Torvalds committed
1111 1112 1113 1114

	SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");

	/* User data follows immediately after the NET/ROM transport header */
1115
	if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
Linus Torvalds's avatar
Linus Torvalds committed
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
		kfree_skb(skb);
		err = -EFAULT;
		goto out;
	}

	SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");

	if (sk->sk_state != TCP_ESTABLISHED) {
		kfree_skb(skb);
		err = -ENOTCONN;
		goto out;
	}

	nr_output(sk, skb);	/* Shove it onto the queue */

	err = len;
out:
	release_sock(sk);
	return err;
}

static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
		      struct msghdr *msg, size_t size, int flags)
{
	struct sock *sk = sock->sk;
	struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
	size_t copied;
	struct sk_buff *skb;
	int er;

	/*
	 * This works for seqpacket too. The receiver has ordered the queue for
	 * us! We do one quick check first though
	 */

	lock_sock(sk);
	if (sk->sk_state != TCP_ESTABLISHED) {
		release_sock(sk);
		return -ENOTCONN;
	}

	/* Now we can treat all alike */
	if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
		release_sock(sk);
		return er;
	}

1163
	skb_reset_transport_header(skb);
Linus Torvalds's avatar
Linus Torvalds committed
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
	copied     = skb->len;

	if (copied > size) {
		copied = size;
		msg->msg_flags |= MSG_TRUNC;
	}

	skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

	if (sax != NULL) {
		sax->sax25_family = AF_NETROM;
1175 1176
		skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
			      AX25_ADDR_LEN);
Linus Torvalds's avatar
Linus Torvalds committed
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
	}

	msg->msg_namelen = sizeof(*sax);

	skb_free_datagram(sk, skb);

	release_sock(sk);
	return copied;
}


static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	struct sock *sk = sock->sk;
	void __user *argp = (void __user *)arg;
	int ret;

	switch (cmd) {
	case TIOCOUTQ: {
		long amount;
1197 1198

		lock_sock(sk);
Linus Torvalds's avatar
Linus Torvalds committed
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
		amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
		if (amount < 0)
			amount = 0;
		release_sock(sk);
		return put_user(amount, (int __user *)argp);
	}

	case TIOCINQ: {
		struct sk_buff *skb;
		long amount = 0L;
1209 1210

		lock_sock(sk);
Linus Torvalds's avatar
Linus Torvalds committed
1211 1212 1213 1214 1215 1216 1217 1218
		/* These two are safe on a single CPU system as only user tasks fiddle here */
		if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
			amount = skb->len;
		release_sock(sk);
		return put_user(amount, (int __user *)argp);
	}

	case SIOCGSTAMP:
1219
		lock_sock(sk);
1220
		ret = sock_get_timestamp(sk, argp);
Linus Torvalds's avatar
Linus Torvalds committed
1221 1222 1223
		release_sock(sk);
		return ret;

1224 1225 1226 1227 1228 1229
	case SIOCGSTAMPNS:
		lock_sock(sk);
		ret = sock_get_timestampns(sk, argp);
		release_sock(sk);
		return ret;

Linus Torvalds's avatar
Linus Torvalds committed
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
	case SIOCGIFADDR:
	case SIOCSIFADDR:
	case SIOCGIFDSTADDR:
	case SIOCSIFDSTADDR:
	case SIOCGIFBRDADDR:
	case SIOCSIFBRDADDR:
	case SIOCGIFNETMASK:
	case SIOCSIFNETMASK:
	case SIOCGIFMETRIC:
	case SIOCSIFMETRIC:
		return -EINVAL;

	case SIOCADDRT:
	case SIOCDELRT:
	case SIOCNRDECOBS:
		if (!capable(CAP_NET_ADMIN)) return -EPERM;
		return nr_rt_ioctl(cmd, argp);

	default:
1249
		return -ENOIOCTLCMD;
Linus Torvalds's avatar
Linus Torvalds committed
1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
	}

	return 0;
}

#ifdef CONFIG_PROC_FS

static void *nr_info_start(struct seq_file *seq, loff_t *pos)
{
	struct sock *s;
	struct hlist_node *node;
	int i = 1;

	spin_lock_bh(&nr_list_lock);
	if (*pos == 0)
		return SEQ_START_TOKEN;

	sk_for_each(s, node, &nr_list) {
		if (i == *pos)
			return s;
		++i;
	}
	return NULL;
}

static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;

1279
	return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
Linus Torvalds's avatar
Linus Torvalds committed
1280 1281
		: sk_next((struct sock *)v);
}
1282

Linus Torvalds's avatar
Linus Torvalds committed
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
static void nr_info_stop(struct seq_file *seq, void *v)
{
	spin_unlock_bh(&nr_list_lock);
}

static int nr_info_show(struct seq_file *seq, void *v)
{
	struct sock *s = v;
	struct net_device *dev;
	struct nr_sock *nr;
	const char *devname;
1294
	char buf[11];
Linus Torvalds's avatar
Linus Torvalds committed
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309

	if (v == SEQ_START_TOKEN)
		seq_puts(seq,
"user_addr dest_node src_node  dev    my  your  st  vs  vr  va    t1     t2     t4      idle   n2  wnd Snd-Q Rcv-Q inode\n");

	else {

		bh_lock_sock(s);
		nr = nr_sk(s);

		if ((dev = nr->device) == NULL)
			devname = "???";
		else
			devname = dev->name;

1310 1311
		seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
		seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1312
		seq_printf(seq,
Linus Torvalds's avatar
Linus Torvalds committed
1313
"%-9s %-3s  %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n",
1314
			ax2asc(buf, &nr->source_addr),
Linus Torvalds's avatar
Linus Torvalds committed
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
			devname,
			nr->my_index,
			nr->my_id,
			nr->your_index,
			nr->your_id,
			nr->state,
			nr->vs,
			nr->vr,
			nr->va,
			ax25_display_timer(&nr->t1timer) / HZ,
			nr->t1 / HZ,
			ax25_display_timer(&nr->t2timer) / HZ,
			nr->t2 / HZ,
			ax25_display_timer(&nr->t4timer) / HZ,
			nr->t4 / HZ,
			ax25_display_timer(&nr->idletimer) / (60 * HZ),
			nr->idle / (60 * HZ),
			nr->n2count,
			nr->n2,
			nr->window,
			atomic_read(&s->sk_wmem_alloc),
			atomic_read(&s->sk_rmem_alloc),
			s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);

		bh_unlock_sock(s);
	}
	return 0;
}

1344
static const struct seq_operations nr_info_seqops = {
Linus Torvalds's avatar
Linus Torvalds committed
1345 1346 1347 1348 1349
	.start = nr_info_start,
	.next = nr_info_next,
	.stop = nr_info_stop,
	.show = nr_info_show,
};
1350

Linus Torvalds's avatar
Linus Torvalds committed
1351 1352 1353 1354
static int nr_info_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &nr_info_seqops);
}
1355

1356
static const struct file_operations nr_info_fops = {
Linus Torvalds's avatar
Linus Torvalds committed
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
	.owner = THIS_MODULE,
	.open = nr_info_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
};
#endif	/* CONFIG_PROC_FS */

static struct net_proto_family nr_family_ops = {
	.family		=	PF_NETROM,
	.create		=	nr_create,
	.owner		=	THIS_MODULE,
};

1371
static const struct proto_ops nr_proto_ops = {
Linus Torvalds's avatar
Linus Torvalds committed
1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397
	.family		=	PF_NETROM,
	.owner		=	THIS_MODULE,
	.release	=	nr_release,
	.bind		=	nr_bind,
	.connect	=	nr_connect,
	.socketpair	=	sock_no_socketpair,
	.accept		=	nr_accept,
	.getname	=	nr_getname,
	.poll		=	datagram_poll,
	.ioctl		=	nr_ioctl,
	.listen		=	nr_listen,
	.shutdown	=	sock_no_shutdown,
	.setsockopt	=	nr_setsockopt,
	.getsockopt	=	nr_getsockopt,
	.sendmsg	=	nr_sendmsg,
	.recvmsg	=	nr_recvmsg,
	.mmap		=	sock_no_mmap,
	.sendpage	=	sock_no_sendpage,
};

static struct notifier_block nr_dev_notifier = {
	.notifier_call	=	nr_device_event,
};

static struct net_device **dev_nr;

1398 1399 1400 1401 1402
static struct ax25_protocol nr_pid = {
	.pid	= AX25_P_NETROM,
	.func	= nr_route_frame
};

1403 1404 1405 1406
static struct ax25_linkfail nr_linkfail_notifier = {
	.func	= nr_link_failed,
};

Linus Torvalds's avatar
Linus Torvalds committed
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
static int __init nr_proto_init(void)
{
	int i;
	int rc = proto_register(&nr_proto, 0);

	if (rc != 0)
		goto out;

	if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
		printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
		return -1;
	}

Ralf Baechle's avatar
Ralf Baechle committed
1420
	dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
	if (dev_nr == NULL) {
		printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
		return -1;
	}

	for (i = 0; i < nr_ndevs; i++) {
		char name[IFNAMSIZ];
		struct net_device *dev;

		sprintf(name, "nr%d", i);
1431
		dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
Linus Torvalds's avatar
Linus Torvalds committed
1432 1433 1434 1435
		if (!dev) {
			printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
			goto fail;
		}
1436

Linus Torvalds's avatar
Linus Torvalds committed
1437 1438 1439 1440 1441 1442
		dev->base_addr = i;
		if (register_netdev(dev)) {
			printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
			free_netdev(dev);
			goto fail;
		}
1443
		nr_set_lockdep_key(dev);
Linus Torvalds's avatar
Linus Torvalds committed
1444 1445 1446 1447 1448 1449 1450
		dev_nr[i] = dev;
	}

	if (sock_register(&nr_family_ops)) {
		printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
		goto fail;
	}
1451

Linus Torvalds's avatar
Linus Torvalds committed
1452 1453
	register_netdevice_notifier(&nr_dev_notifier);

1454
	ax25_register_pid(&nr_pid);
1455
	ax25_linkfail_register(&nr_linkfail_notifier);
Linus Torvalds's avatar
Linus Torvalds committed
1456 1457 1458 1459 1460 1461 1462

#ifdef CONFIG_SYSCTL
	nr_register_sysctl();
#endif

	nr_loopback_init();

1463 1464 1465
	proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops);
	proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops);
	proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops);
Linus Torvalds's avatar
Linus Torvalds committed
1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
out:
	return rc;
fail:
	while (--i >= 0) {
		unregister_netdev(dev_nr[i]);
		free_netdev(dev_nr[i]);
	}
	kfree(dev_nr);
	proto_unregister(&nr_proto);
	rc = -1;
	goto out;
}

module_init(nr_proto_init);

module_param(nr_ndevs, int, 0);
MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");

MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_NETROM);

static void __exit nr_exit(void)
{
	int i;

1493 1494 1495
	proc_net_remove(&init_net, "nr");
	proc_net_remove(&init_net, "nr_neigh");
	proc_net_remove(&init_net, "nr_nodes");
Linus Torvalds's avatar
Linus Torvalds committed
1496 1497 1498 1499 1500 1501 1502 1503
	nr_loopback_clear();

	nr_rt_free();

#ifdef CONFIG_SYSCTL
	nr_unregister_sysctl();
#endif

1504
	ax25_linkfail_release(&nr_linkfail_notifier);
Linus Torvalds's avatar
Linus Torvalds committed
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
	ax25_protocol_release(AX25_P_NETROM);

	unregister_netdevice_notifier(&nr_dev_notifier);

	sock_unregister(PF_NETROM);

	for (i = 0; i < nr_ndevs; i++) {
		struct net_device *dev = dev_nr[i];
		if (dev) {
			unregister_netdev(dev);
			free_netdev(dev);
		}
	}

	kfree(dev_nr);
	proto_unregister(&nr_proto);
}
module_exit(nr_exit);