1
   2/*
   3 * DECnet       An implementation of the DECnet protocol suite for the LINUX
   4 *              operating system.  DECnet is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              DECnet Socket Layer Interface
   8 *
   9 * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
  10 *              Patrick Caulfield <patrick@pandh.demon.co.uk>
  11 *
  12 * Changes:
  13 *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
  14 *                          version of the code. Original copyright preserved
  15 *                          below.
  16 *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
  17 *                          compatible with my routing layer.
  18 *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
  19 *                          Caulfield.
  20 *        Steve Whitehouse: Further bug fixes, checking module code still works
  21 *                          with new routing layer.
  22 *        Steve Whitehouse: Additional set/get_sockopt() calls.
  23 *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
  24 *                          code.
  25 *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
  26 *                          way. Didn't manage it entirely, but its better.
  27 *        Steve Whitehouse: ditto for sendmsg().
  28 *        Steve Whitehouse: A selection of bug fixes to various things.
  29 *        Steve Whitehouse: Added TIOCOUTQ ioctl.
  30 *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
  31 *        Steve Whitehouse: Fixes to connect() error returns.
  32 *       Patrick Caulfield: Fixes to delayed acceptance logic.
  33 *         David S. Miller: New socket locking
  34 *        Steve Whitehouse: Socket list hashing/locking
  35 *         Arnaldo C. Melo: use capable, not suser
  36 *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
  37 *                          when required.
  38 *       Patrick Caulfield: /proc/net/decnet now has object name/number
  39 *        Steve Whitehouse: Fixed local port allocation, hashed sk list
  40 *          Matthew Wilcox: Fixes for dn_ioctl()
  41 *        Steve Whitehouse: New connect/accept logic to allow timeouts and
  42 *                          prepare for sendpage etc.
  43 */
  44
  45
  46/******************************************************************************
  47    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
  48
  49    This program is free software; you can redistribute it and/or modify
  50    it under the terms of the GNU General Public License as published by
  51    the Free Software Foundation; either version 2 of the License, or
  52    any later version.
  53
  54    This program is distributed in the hope that it will be useful,
  55    but WITHOUT ANY WARRANTY; without even the implied warranty of
  56    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  57    GNU General Public License for more details.
  58
  59HISTORY:
  60
  61Version           Kernel     Date       Author/Comments
  62-------           ------     ----       ---------------
  63Version 0.0.1     2.0.30    01-dic-97	Eduardo Marcelo Serrat
  64					(emserrat@geocities.com)
  65
  66					First Development of DECnet Socket La-
  67					yer for Linux. Only supports outgoing
  68					connections.
  69
  70Version 0.0.2	  2.1.105   20-jun-98   Patrick J. Caulfield
  71					(patrick@pandh.demon.co.uk)
  72
  73					Port to new kernel development version.
  74
  75Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
  76					(emserrat@geocities.com)
  77					_
  78					Added support for incoming connections
  79					so we can start developing server apps
  80					on Linux.
  81					-
  82					Module Support
  83Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
  84				       (emserrat@geocities.com)
  85				       _
  86					Added support for X11R6.4. Now we can
  87					use DECnet transport for X on Linux!!!
  88				       -
  89Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
  90				       (emserrat@geocities.com)
  91				       Removed bugs on flow control
  92				       Removed bugs on incoming accessdata
  93				       order
  94				       -
  95Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
  96				       dn_recvmsg fixes
  97
  98					Patrick J. Caulfield
  99				       dn_bind fixes
 100*******************************************************************************/
 101
 102#include <linux/module.h>
 103#include <linux/errno.h>
 104#include <linux/types.h>
 105#include <linux/slab.h>
 106#include <linux/socket.h>
 107#include <linux/in.h>
 108#include <linux/kernel.h>
 109#include <linux/sched.h>
 110#include <linux/timer.h>
 111#include <linux/string.h>
 112#include <linux/sockios.h>
 113#include <linux/net.h>
 114#include <linux/netdevice.h>
 115#include <linux/inet.h>
 116#include <linux/route.h>
 117#include <linux/netfilter.h>
 118#include <linux/seq_file.h>
 119#include <net/sock.h>
 120#include <net/tcp_states.h>
 121#include <net/flow.h>
 122#include <asm/system.h>
 123#include <asm/ioctls.h>
 124#include <linux/capability.h>
 125#include <linux/mm.h>
 126#include <linux/interrupt.h>
 127#include <linux/proc_fs.h>
 128#include <linux/stat.h>
 129#include <linux/init.h>
 130#include <linux/poll.h>
 
 131#include <net/net_namespace.h>
 132#include <net/neighbour.h>
 133#include <net/dst.h>
 134#include <net/fib_rules.h>
 
 135#include <net/dn.h>
 136#include <net/dn_nsp.h>
 137#include <net/dn_dev.h>
 138#include <net/dn_route.h>
 139#include <net/dn_fib.h>
 140#include <net/dn_neigh.h>
 141
 142struct dn_sock {
 143	struct sock sk;
 144	struct dn_scp scp;
 145};
 146
 147static void dn_keepalive(struct sock *sk);
 148
 149#define DN_SK_HASH_SHIFT 8
 150#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
 151#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
 152
 153
 154static const struct proto_ops dn_proto_ops;
 155static DEFINE_RWLOCK(dn_hash_lock);
 156static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 157static struct hlist_head dn_wild_sk;
 158static atomic_long_t decnet_memory_allocated;
 159
 160static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
 
 161static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 162
 163static struct hlist_head *dn_find_list(struct sock *sk)
 164{
 165	struct dn_scp *scp = DN_SK(sk);
 166
 167	if (scp->addr.sdn_flags & SDF_WILD)
 168		return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 169
 170	return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
 171}
 172
 173/*
 174 * Valid ports are those greater than zero and not already in use.
 175 */
 176static int check_port(__le16 port)
 177{
 178	struct sock *sk;
 179	struct hlist_node *node;
 180
 181	if (port == 0)
 182		return -1;
 183
 184	sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
 185		struct dn_scp *scp = DN_SK(sk);
 186		if (scp->addrloc == port)
 187			return -1;
 188	}
 189	return 0;
 190}
 191
 192static unsigned short port_alloc(struct sock *sk)
 193{
 194	struct dn_scp *scp = DN_SK(sk);
 195static unsigned short port = 0x2000;
 196	unsigned short i_port = port;
 197
 198	while(check_port(cpu_to_le16(++port)) != 0) {
 199		if (port == i_port)
 200			return 0;
 201	}
 202
 203	scp->addrloc = cpu_to_le16(port);
 204
 205	return 1;
 206}
 207
 208/*
 209 * Since this is only ever called from user
 210 * level, we don't need a write_lock() version
 211 * of this.
 212 */
 213static int dn_hash_sock(struct sock *sk)
 214{
 215	struct dn_scp *scp = DN_SK(sk);
 216	struct hlist_head *list;
 217	int rv = -EUSERS;
 218
 219	BUG_ON(sk_hashed(sk));
 220
 221	write_lock_bh(&dn_hash_lock);
 222
 223	if (!scp->addrloc && !port_alloc(sk))
 224		goto out;
 225
 226	rv = -EADDRINUSE;
 227	if ((list = dn_find_list(sk)) == NULL)
 228		goto out;
 229
 230	sk_add_node(sk, list);
 231	rv = 0;
 232out:
 233	write_unlock_bh(&dn_hash_lock);
 234	return rv;
 235}
 236
 237static void dn_unhash_sock(struct sock *sk)
 238{
 239	write_lock(&dn_hash_lock);
 240	sk_del_node_init(sk);
 241	write_unlock(&dn_hash_lock);
 242}
 243
 244static void dn_unhash_sock_bh(struct sock *sk)
 245{
 246	write_lock_bh(&dn_hash_lock);
 247	sk_del_node_init(sk);
 248	write_unlock_bh(&dn_hash_lock);
 249}
 250
 251static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 252{
 253	int i;
 254	unsigned hash = addr->sdn_objnum;
 255
 256	if (hash == 0) {
 257		hash = addr->sdn_objnamel;
 258		for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
 259			hash ^= addr->sdn_objname[i];
 260			hash ^= (hash << 3);
 261		}
 262	}
 263
 264	return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 265}
 266
 267/*
 268 * Called to transform a socket from bound (i.e. with a local address)
 269 * into a listening socket (doesn't need a local port number) and rehashes
 270 * based upon the object name/number.
 271 */
 272static void dn_rehash_sock(struct sock *sk)
 273{
 274	struct hlist_head *list;
 275	struct dn_scp *scp = DN_SK(sk);
 276
 277	if (scp->addr.sdn_flags & SDF_WILD)
 278		return;
 279
 280	write_lock_bh(&dn_hash_lock);
 281	sk_del_node_init(sk);
 282	DN_SK(sk)->addrloc = 0;
 283	list = listen_hash(&DN_SK(sk)->addr);
 284	sk_add_node(sk, list);
 285	write_unlock_bh(&dn_hash_lock);
 286}
 287
 288int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 289{
 290	int len = 2;
 291
 292	*buf++ = type;
 293
 294	switch (type) {
 295	case 0:
 296		*buf++ = sdn->sdn_objnum;
 297		break;
 298	case 1:
 299		*buf++ = 0;
 300		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
 301		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 302		len = 3 + le16_to_cpu(sdn->sdn_objnamel);
 303		break;
 304	case 2:
 305		memset(buf, 0, 5);
 306		buf += 5;
 307		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
 308		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 309		len = 7 + le16_to_cpu(sdn->sdn_objnamel);
 310		break;
 311	}
 312
 313	return len;
 314}
 315
 316/*
 317 * On reception of usernames, we handle types 1 and 0 for destination
 318 * addresses only. Types 2 and 4 are used for source addresses, but the
 319 * UIC, GIC are ignored and they are both treated the same way. Type 3
 320 * is never used as I've no idea what its purpose might be or what its
 321 * format is.
 322 */
 323int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 324{
 325	unsigned char type;
 326	int size = len;
 327	int namel = 12;
 328
 329	sdn->sdn_objnum = 0;
 330	sdn->sdn_objnamel = cpu_to_le16(0);
 331	memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 332
 333	if (len < 2)
 334		return -1;
 335
 336	len -= 2;
 337	*fmt = *data++;
 338	type = *data++;
 339
 340	switch (*fmt) {
 341	case 0:
 342		sdn->sdn_objnum = type;
 343		return 2;
 344	case 1:
 345		namel = 16;
 346		break;
 347	case 2:
 348		len  -= 4;
 349		data += 4;
 350		break;
 351	case 4:
 352		len  -= 8;
 353		data += 8;
 354		break;
 355	default:
 356		return -1;
 357	}
 358
 359	len -= 1;
 360
 361	if (len < 0)
 362		return -1;
 363
 364	sdn->sdn_objnamel = cpu_to_le16(*data++);
 365	len -= le16_to_cpu(sdn->sdn_objnamel);
 366
 367	if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
 368		return -1;
 369
 370	memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
 371
 372	return size - len;
 373}
 374
 375struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 376{
 377	struct hlist_head *list = listen_hash(addr);
 378	struct hlist_node *node;
 379	struct sock *sk;
 380
 381	read_lock(&dn_hash_lock);
 382	sk_for_each(sk, node, list) {
 383		struct dn_scp *scp = DN_SK(sk);
 384		if (sk->sk_state != TCP_LISTEN)
 385			continue;
 386		if (scp->addr.sdn_objnum) {
 387			if (scp->addr.sdn_objnum != addr->sdn_objnum)
 388				continue;
 389		} else {
 390			if (addr->sdn_objnum)
 391				continue;
 392			if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 393				continue;
 394			if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
 395				continue;
 396		}
 397		sock_hold(sk);
 398		read_unlock(&dn_hash_lock);
 399		return sk;
 400	}
 401
 402	sk = sk_head(&dn_wild_sk);
 403	if (sk) {
 404		if (sk->sk_state == TCP_LISTEN)
 405			sock_hold(sk);
 406		else
 407			sk = NULL;
 408	}
 409
 410	read_unlock(&dn_hash_lock);
 411	return sk;
 412}
 413
 414struct sock *dn_find_by_skb(struct sk_buff *skb)
 415{
 416	struct dn_skb_cb *cb = DN_SKB_CB(skb);
 417	struct sock *sk;
 418	struct hlist_node *node;
 419	struct dn_scp *scp;
 420
 421	read_lock(&dn_hash_lock);
 422	sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
 423		scp = DN_SK(sk);
 424		if (cb->src != dn_saddr2dn(&scp->peer))
 425			continue;
 426		if (cb->dst_port != scp->addrloc)
 427			continue;
 428		if (scp->addrrem && (cb->src_port != scp->addrrem))
 429			continue;
 430		sock_hold(sk);
 431		goto found;
 432	}
 433	sk = NULL;
 434found:
 435	read_unlock(&dn_hash_lock);
 436	return sk;
 437}
 438
 439
 440
 441static void dn_destruct(struct sock *sk)
 442{
 443	struct dn_scp *scp = DN_SK(sk);
 444
 445	skb_queue_purge(&scp->data_xmit_queue);
 446	skb_queue_purge(&scp->other_xmit_queue);
 447	skb_queue_purge(&scp->other_receive_queue);
 448
 449	dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
 450}
 451
 452static int dn_memory_pressure;
 453
 454static void dn_enter_memory_pressure(struct sock *sk)
 455{
 456	if (!dn_memory_pressure) {
 457		dn_memory_pressure = 1;
 458	}
 459}
 460
 461static struct proto dn_proto = {
 462	.name			= "NSP",
 463	.owner			= THIS_MODULE,
 464	.enter_memory_pressure	= dn_enter_memory_pressure,
 465	.memory_pressure	= &dn_memory_pressure,
 466	.memory_allocated	= &decnet_memory_allocated,
 467	.sysctl_mem		= sysctl_decnet_mem,
 468	.sysctl_wmem		= sysctl_decnet_wmem,
 469	.sysctl_rmem		= sysctl_decnet_rmem,
 470	.max_header		= DN_MAX_NSP_DATA_HEADER + 64,
 471	.obj_size		= sizeof(struct dn_sock),
 472};
 473
 474static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
 475{
 476	struct dn_scp *scp;
 477	struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
 478
 479	if  (!sk)
 480		goto out;
 481
 482	if (sock)
 483		sock->ops = &dn_proto_ops;
 484	sock_init_data(sock, sk);
 485
 486	sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 487	sk->sk_destruct    = dn_destruct;
 488	sk->sk_no_check    = 1;
 489	sk->sk_family      = PF_DECnet;
 490	sk->sk_protocol    = 0;
 491	sk->sk_allocation  = gfp;
 492	sk->sk_sndbuf	   = sysctl_decnet_wmem[1];
 493	sk->sk_rcvbuf	   = sysctl_decnet_rmem[1];
 494
 495	/* Initialization of DECnet Session Control Port		*/
 496	scp = DN_SK(sk);
 497	scp->state	= DN_O;		/* Open			*/
 498	scp->numdat	= 1;		/* Next data seg to tx	*/
 499	scp->numoth	= 1;		/* Next oth data to tx  */
 500	scp->ackxmt_dat = 0;		/* Last data seg ack'ed */
 501	scp->ackxmt_oth = 0;		/* Last oth data ack'ed */
 502	scp->ackrcv_dat = 0;		/* Highest data ack recv*/
 503	scp->ackrcv_oth = 0;		/* Last oth data ack rec*/
 504	scp->flowrem_sw = DN_SEND;
 505	scp->flowloc_sw = DN_SEND;
 506	scp->flowrem_dat = 0;
 507	scp->flowrem_oth = 1;
 508	scp->flowloc_dat = 0;
 509	scp->flowloc_oth = 1;
 510	scp->services_rem = 0;
 511	scp->services_loc = 1 | NSP_FC_NONE;
 512	scp->info_rem = 0;
 513	scp->info_loc = 0x03; /* NSP version 4.1 */
 514	scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 515	scp->nonagle = 0;
 516	scp->multi_ireq = 1;
 517	scp->accept_mode = ACC_IMMED;
 518	scp->addr.sdn_family    = AF_DECnet;
 519	scp->peer.sdn_family    = AF_DECnet;
 520	scp->accessdata.acc_accl = 5;
 521	memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 522
 523	scp->max_window   = NSP_MAX_WINDOW;
 524	scp->snd_window   = NSP_MIN_WINDOW;
 525	scp->nsp_srtt     = NSP_INITIAL_SRTT;
 526	scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 527	scp->nsp_rxtshift = 0;
 528
 529	skb_queue_head_init(&scp->data_xmit_queue);
 530	skb_queue_head_init(&scp->other_xmit_queue);
 531	skb_queue_head_init(&scp->other_receive_queue);
 532
 533	scp->persist = 0;
 534	scp->persist_fxn = NULL;
 535	scp->keepalive = 10 * HZ;
 536	scp->keepalive_fxn = dn_keepalive;
 537
 538	init_timer(&scp->delack_timer);
 539	scp->delack_pending = 0;
 540	scp->delack_fxn = dn_nsp_delayed_ack;
 541
 542	dn_start_slow_timer(sk);
 543out:
 544	return sk;
 545}
 546
 547/*
 548 * Keepalive timer.
 549 * FIXME: Should respond to SO_KEEPALIVE etc.
 550 */
 551static void dn_keepalive(struct sock *sk)
 552{
 553	struct dn_scp *scp = DN_SK(sk);
 554
 555	/*
 556	 * By checking the other_data transmit queue is empty
 557	 * we are double checking that we are not sending too
 558	 * many of these keepalive frames.
 559	 */
 560	if (skb_queue_empty(&scp->other_xmit_queue))
 561		dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 562}
 563
 564
 565/*
 566 * Timer for shutdown/destroyed sockets.
 567 * When socket is dead & no packets have been sent for a
 568 * certain amount of time, they are removed by this
 569 * routine. Also takes care of sending out DI & DC
 570 * frames at correct times.
 571 */
 572int dn_destroy_timer(struct sock *sk)
 573{
 574	struct dn_scp *scp = DN_SK(sk);
 575
 576	scp->persist = dn_nsp_persist(sk);
 577
 578	switch (scp->state) {
 579	case DN_DI:
 580		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 581		if (scp->nsp_rxtshift >= decnet_di_count)
 582			scp->state = DN_CN;
 583		return 0;
 584
 585	case DN_DR:
 586		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 587		if (scp->nsp_rxtshift >= decnet_dr_count)
 588			scp->state = DN_DRC;
 589		return 0;
 590
 591	case DN_DN:
 592		if (scp->nsp_rxtshift < decnet_dn_count) {
 593			/* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 594			dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 595					 GFP_ATOMIC);
 596			return 0;
 597		}
 598	}
 599
 600	scp->persist = (HZ * decnet_time_wait);
 601
 602	if (sk->sk_socket)
 603		return 0;
 604
 605	if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
 606		dn_unhash_sock(sk);
 607		sock_put(sk);
 608		return 1;
 609	}
 610
 611	return 0;
 612}
 613
 614static void dn_destroy_sock(struct sock *sk)
 615{
 616	struct dn_scp *scp = DN_SK(sk);
 617
 618	scp->nsp_rxtshift = 0; /* reset back off */
 619
 620	if (sk->sk_socket) {
 621		if (sk->sk_socket->state != SS_UNCONNECTED)
 622			sk->sk_socket->state = SS_DISCONNECTING;
 623	}
 624
 625	sk->sk_state = TCP_CLOSE;
 626
 627	switch (scp->state) {
 628	case DN_DN:
 629		dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 630				 sk->sk_allocation);
 631		scp->persist_fxn = dn_destroy_timer;
 632		scp->persist = dn_nsp_persist(sk);
 633		break;
 634	case DN_CR:
 635		scp->state = DN_DR;
 636		goto disc_reject;
 637	case DN_RUN:
 638		scp->state = DN_DI;
 
 639	case DN_DI:
 640	case DN_DR:
 641disc_reject:
 642		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 
 643	case DN_NC:
 644	case DN_NR:
 645	case DN_RJ:
 646	case DN_DIC:
 647	case DN_CN:
 648	case DN_DRC:
 649	case DN_CI:
 650	case DN_CD:
 651		scp->persist_fxn = dn_destroy_timer;
 652		scp->persist = dn_nsp_persist(sk);
 653		break;
 654	default:
 655		printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 
 656	case DN_O:
 657		dn_stop_slow_timer(sk);
 658
 659		dn_unhash_sock_bh(sk);
 660		sock_put(sk);
 661
 662		break;
 663	}
 664}
 665
 666char *dn_addr2asc(__u16 addr, char *buf)
 667{
 668	unsigned short node, area;
 669
 670	node = addr & 0x03ff;
 671	area = addr >> 10;
 672	sprintf(buf, "%hd.%hd", area, node);
 673
 674	return buf;
 675}
 676
 677
 678
 679static int dn_create(struct net *net, struct socket *sock, int protocol,
 680		     int kern)
 681{
 682	struct sock *sk;
 683
 
 
 
 684	if (!net_eq(net, &init_net))
 685		return -EAFNOSUPPORT;
 686
 687	switch (sock->type) {
 688	case SOCK_SEQPACKET:
 689		if (protocol != DNPROTO_NSP)
 690			return -EPROTONOSUPPORT;
 691		break;
 692	case SOCK_STREAM:
 693		break;
 694	default:
 695		return -ESOCKTNOSUPPORT;
 696	}
 697
 698
 699	if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
 700		return -ENOBUFS;
 701
 702	sk->sk_protocol = protocol;
 703
 704	return 0;
 705}
 706
 707
 708static int
 709dn_release(struct socket *sock)
 710{
 711	struct sock *sk = sock->sk;
 712
 713	if (sk) {
 714		sock_orphan(sk);
 715		sock_hold(sk);
 716		lock_sock(sk);
 717		dn_destroy_sock(sk);
 718		release_sock(sk);
 719		sock_put(sk);
 720	}
 721
 722	return 0;
 723}
 724
 725static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 726{
 727	struct sock *sk = sock->sk;
 728	struct dn_scp *scp = DN_SK(sk);
 729	struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 730	struct net_device *dev, *ldev;
 731	int rv;
 732
 733	if (addr_len != sizeof(struct sockaddr_dn))
 734		return -EINVAL;
 735
 736	if (saddr->sdn_family != AF_DECnet)
 737		return -EINVAL;
 738
 739	if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 740		return -EINVAL;
 741
 742	if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
 743		return -EINVAL;
 744
 745	if (saddr->sdn_flags & ~SDF_WILD)
 746		return -EINVAL;
 747
 748	if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 749	    (saddr->sdn_flags & SDF_WILD)))
 750		return -EACCES;
 751
 752	if (!(saddr->sdn_flags & SDF_WILD)) {
 753		if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
 754			rcu_read_lock();
 755			ldev = NULL;
 756			for_each_netdev_rcu(&init_net, dev) {
 757				if (!dev->dn_ptr)
 758					continue;
 759				if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 760					ldev = dev;
 761					break;
 762				}
 763			}
 764			rcu_read_unlock();
 765			if (ldev == NULL)
 766				return -EADDRNOTAVAIL;
 767		}
 768	}
 769
 770	rv = -EINVAL;
 771	lock_sock(sk);
 772	if (sock_flag(sk, SOCK_ZAPPED)) {
 773		memcpy(&scp->addr, saddr, addr_len);
 774		sock_reset_flag(sk, SOCK_ZAPPED);
 775
 776		rv = dn_hash_sock(sk);
 777		if (rv)
 778			sock_set_flag(sk, SOCK_ZAPPED);
 779	}
 780	release_sock(sk);
 781
 782	return rv;
 783}
 784
 785
 786static int dn_auto_bind(struct socket *sock)
 787{
 788	struct sock *sk = sock->sk;
 789	struct dn_scp *scp = DN_SK(sk);
 790	int rv;
 791
 792	sock_reset_flag(sk, SOCK_ZAPPED);
 793
 794	scp->addr.sdn_flags  = 0;
 795	scp->addr.sdn_objnum = 0;
 796
 797	/*
 798	 * This stuff is to keep compatibility with Eduardo's
 799	 * patch. I hope I can dispense with it shortly...
 800	 */
 801	if ((scp->accessdata.acc_accl != 0) &&
 802		(scp->accessdata.acc_accl <= 12)) {
 803
 804		scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
 805		memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
 806
 807		scp->accessdata.acc_accl = 0;
 808		memset(scp->accessdata.acc_acc, 0, 40);
 809	}
 810	/* End of compatibility stuff */
 811
 812	scp->addr.sdn_add.a_len = cpu_to_le16(2);
 813	rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 814	if (rv == 0) {
 815		rv = dn_hash_sock(sk);
 816		if (rv)
 817			sock_set_flag(sk, SOCK_ZAPPED);
 818	}
 819
 820	return rv;
 821}
 822
 823static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 824{
 825	struct dn_scp *scp = DN_SK(sk);
 826	DEFINE_WAIT(wait);
 827	int err;
 828
 829	if (scp->state != DN_CR)
 830		return -EINVAL;
 831
 832	scp->state = DN_CC;
 833	scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
 834	dn_send_conn_conf(sk, allocation);
 835
 836	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 837	for(;;) {
 838		release_sock(sk);
 839		if (scp->state == DN_CC)
 840			*timeo = schedule_timeout(*timeo);
 841		lock_sock(sk);
 842		err = 0;
 843		if (scp->state == DN_RUN)
 844			break;
 845		err = sock_error(sk);
 846		if (err)
 847			break;
 848		err = sock_intr_errno(*timeo);
 849		if (signal_pending(current))
 850			break;
 851		err = -EAGAIN;
 852		if (!*timeo)
 853			break;
 854		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 855	}
 856	finish_wait(sk_sleep(sk), &wait);
 857	if (err == 0) {
 858		sk->sk_socket->state = SS_CONNECTED;
 859	} else if (scp->state != DN_CC) {
 860		sk->sk_socket->state = SS_UNCONNECTED;
 861	}
 862	return err;
 863}
 864
 865static int dn_wait_run(struct sock *sk, long *timeo)
 866{
 867	struct dn_scp *scp = DN_SK(sk);
 868	DEFINE_WAIT(wait);
 869	int err = 0;
 870
 871	if (scp->state == DN_RUN)
 872		goto out;
 873
 874	if (!*timeo)
 875		return -EALREADY;
 876
 877	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 878	for(;;) {
 879		release_sock(sk);
 880		if (scp->state == DN_CI || scp->state == DN_CC)
 881			*timeo = schedule_timeout(*timeo);
 882		lock_sock(sk);
 883		err = 0;
 884		if (scp->state == DN_RUN)
 885			break;
 886		err = sock_error(sk);
 887		if (err)
 888			break;
 889		err = sock_intr_errno(*timeo);
 890		if (signal_pending(current))
 891			break;
 892		err = -ETIMEDOUT;
 893		if (!*timeo)
 894			break;
 895		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 896	}
 897	finish_wait(sk_sleep(sk), &wait);
 898out:
 899	if (err == 0) {
 900		sk->sk_socket->state = SS_CONNECTED;
 901	} else if (scp->state != DN_CI && scp->state != DN_CC) {
 902		sk->sk_socket->state = SS_UNCONNECTED;
 903	}
 904	return err;
 905}
 906
 907static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 908{
 909	struct socket *sock = sk->sk_socket;
 910	struct dn_scp *scp = DN_SK(sk);
 911	int err = -EISCONN;
 912	struct flowidn fld;
 
 913
 914	if (sock->state == SS_CONNECTED)
 915		goto out;
 916
 917	if (sock->state == SS_CONNECTING) {
 918		err = 0;
 919		if (scp->state == DN_RUN) {
 920			sock->state = SS_CONNECTED;
 921			goto out;
 922		}
 923		err = -ECONNREFUSED;
 924		if (scp->state != DN_CI && scp->state != DN_CC) {
 925			sock->state = SS_UNCONNECTED;
 926			goto out;
 927		}
 928		return dn_wait_run(sk, timeo);
 929	}
 930
 931	err = -EINVAL;
 932	if (scp->state != DN_O)
 933		goto out;
 934
 935	if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 936		goto out;
 937	if (addr->sdn_family != AF_DECnet)
 938		goto out;
 939	if (addr->sdn_flags & SDF_WILD)
 940		goto out;
 941
 942	if (sock_flag(sk, SOCK_ZAPPED)) {
 943		err = dn_auto_bind(sk->sk_socket);
 944		if (err)
 945			goto out;
 946	}
 947
 948	memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 949
 950	err = -EHOSTUNREACH;
 951	memset(&fld, 0, sizeof(fld));
 952	fld.flowidn_oif = sk->sk_bound_dev_if;
 953	fld.daddr = dn_saddr2dn(&scp->peer);
 954	fld.saddr = dn_saddr2dn(&scp->addr);
 955	dn_sk_ports_copy(&fld, scp);
 956	fld.flowidn_proto = DNPROTO_NSP;
 957	if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
 958		goto out;
 959	sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 
 960	sock->state = SS_CONNECTING;
 961	scp->state = DN_CI;
 962	scp->segsize_loc = dst_metric_advmss(sk->sk_dst_cache);
 963
 964	dn_nsp_send_conninit(sk, NSP_CI);
 965	err = -EINPROGRESS;
 966	if (*timeo) {
 967		err = dn_wait_run(sk, timeo);
 968	}
 969out:
 970	return err;
 971}
 972
 973static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 974{
 975	struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 976	struct sock *sk = sock->sk;
 977	int err;
 978	long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 979
 980	lock_sock(sk);
 981	err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 982	release_sock(sk);
 983
 984	return err;
 985}
 986
 987static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 988{
 989	struct dn_scp *scp = DN_SK(sk);
 990
 991	switch (scp->state) {
 992	case DN_RUN:
 993		return 0;
 994	case DN_CR:
 995		return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 996	case DN_CI:
 997	case DN_CC:
 998		return dn_wait_run(sk, timeo);
 999	case DN_O:
1000		return __dn_connect(sk, addr, addrlen, timeo, flags);
1001	}
1002
1003	return -EINVAL;
1004}
1005
1006
1007static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1008{
1009	unsigned char *ptr = skb->data;
1010
1011	acc->acc_userl = *ptr++;
1012	memcpy(&acc->acc_user, ptr, acc->acc_userl);
1013	ptr += acc->acc_userl;
1014
1015	acc->acc_passl = *ptr++;
1016	memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1017	ptr += acc->acc_passl;
1018
1019	acc->acc_accl = *ptr++;
1020	memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1021
1022	skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1023
1024}
1025
1026static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1027{
1028	unsigned char *ptr = skb->data;
1029	u16 len = *ptr++; /* yes, it's 8bit on the wire */
1030
1031	BUG_ON(len > 16); /* we've checked the contents earlier */
1032	opt->opt_optl   = cpu_to_le16(len);
1033	opt->opt_status = 0;
1034	memcpy(opt->opt_data, ptr, len);
1035	skb_pull(skb, len + 1);
1036}
1037
1038static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1039{
1040	DEFINE_WAIT(wait);
1041	struct sk_buff *skb = NULL;
1042	int err = 0;
1043
1044	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1045	for(;;) {
1046		release_sock(sk);
1047		skb = skb_dequeue(&sk->sk_receive_queue);
1048		if (skb == NULL) {
1049			*timeo = schedule_timeout(*timeo);
1050			skb = skb_dequeue(&sk->sk_receive_queue);
1051		}
1052		lock_sock(sk);
1053		if (skb != NULL)
1054			break;
1055		err = -EINVAL;
1056		if (sk->sk_state != TCP_LISTEN)
1057			break;
1058		err = sock_intr_errno(*timeo);
1059		if (signal_pending(current))
1060			break;
1061		err = -EAGAIN;
1062		if (!*timeo)
1063			break;
1064		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1065	}
1066	finish_wait(sk_sleep(sk), &wait);
1067
1068	return skb == NULL ? ERR_PTR(err) : skb;
1069}
1070
1071static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
 
1072{
1073	struct sock *sk = sock->sk, *newsk;
1074	struct sk_buff *skb = NULL;
1075	struct dn_skb_cb *cb;
1076	unsigned char menuver;
1077	int err = 0;
1078	unsigned char type;
1079	long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1080	struct dst_entry *dst;
1081
1082	lock_sock(sk);
1083
1084	if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1085		release_sock(sk);
1086		return -EINVAL;
1087	}
1088
1089	skb = skb_dequeue(&sk->sk_receive_queue);
1090	if (skb == NULL) {
1091		skb = dn_wait_for_connect(sk, &timeo);
1092		if (IS_ERR(skb)) {
1093			release_sock(sk);
1094			return PTR_ERR(skb);
1095		}
1096	}
1097
1098	cb = DN_SKB_CB(skb);
1099	sk->sk_ack_backlog--;
1100	newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1101	if (newsk == NULL) {
1102		release_sock(sk);
1103		kfree_skb(skb);
1104		return -ENOBUFS;
1105	}
1106	release_sock(sk);
1107
1108	dst = skb_dst(skb);
1109	sk_dst_set(newsk, dst);
1110	skb_dst_set(skb, NULL);
1111
1112	DN_SK(newsk)->state        = DN_CR;
1113	DN_SK(newsk)->addrrem      = cb->src_port;
1114	DN_SK(newsk)->services_rem = cb->services;
1115	DN_SK(newsk)->info_rem     = cb->info;
1116	DN_SK(newsk)->segsize_rem  = cb->segsize;
1117	DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1118
1119	if (DN_SK(newsk)->segsize_rem < 230)
1120		DN_SK(newsk)->segsize_rem = 230;
1121
1122	if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1123		DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1124
1125	newsk->sk_state  = TCP_LISTEN;
1126	memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1127
1128	/*
1129	 * If we are listening on a wild socket, we don't want
1130	 * the newly created socket on the wrong hash queue.
1131	 */
1132	DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1133
1134	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1135	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1136	*(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1137	*(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1138
1139	menuver = *skb->data;
1140	skb_pull(skb, 1);
1141
1142	if (menuver & DN_MENUVER_ACC)
1143		dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1144
1145	if (menuver & DN_MENUVER_USR)
1146		dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1147
1148	if (menuver & DN_MENUVER_PRX)
1149		DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1150
1151	if (menuver & DN_MENUVER_UIC)
1152		DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1153
1154	kfree_skb(skb);
1155
1156	memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1157		sizeof(struct optdata_dn));
1158	memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1159		sizeof(struct optdata_dn));
1160
1161	lock_sock(newsk);
1162	err = dn_hash_sock(newsk);
1163	if (err == 0) {
1164		sock_reset_flag(newsk, SOCK_ZAPPED);
1165		dn_send_conn_ack(newsk);
1166
1167		/*
1168		 * Here we use sk->sk_allocation since although the conn conf is
1169		 * for the newsk, the context is the old socket.
1170		 */
1171		if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1172			err = dn_confirm_accept(newsk, &timeo,
1173						sk->sk_allocation);
1174	}
1175	release_sock(newsk);
1176	return err;
1177}
1178
1179
1180static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1181{
1182	struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1183	struct sock *sk = sock->sk;
1184	struct dn_scp *scp = DN_SK(sk);
1185
1186	*uaddr_len = sizeof(struct sockaddr_dn);
1187
1188	lock_sock(sk);
1189
1190	if (peer) {
1191		if ((sock->state != SS_CONNECTED &&
1192		     sock->state != SS_CONNECTING) &&
1193		    scp->accept_mode == ACC_IMMED) {
1194			release_sock(sk);
1195			return -ENOTCONN;
1196		}
1197
1198		memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1199	} else {
1200		memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1201	}
1202
1203	release_sock(sk);
1204
1205	return 0;
1206}
1207
1208
1209static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1210{
1211	struct sock *sk = sock->sk;
1212	struct dn_scp *scp = DN_SK(sk);
1213	int mask = datagram_poll(file, sock, wait);
1214
1215	if (!skb_queue_empty(&scp->other_receive_queue))
1216		mask |= POLLRDBAND;
1217
1218	return mask;
1219}
1220
1221static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1222{
1223	struct sock *sk = sock->sk;
1224	struct dn_scp *scp = DN_SK(sk);
1225	int err = -EOPNOTSUPP;
1226	long amount = 0;
1227	struct sk_buff *skb;
1228	int val;
1229
1230	switch(cmd)
1231	{
1232	case SIOCGIFADDR:
1233	case SIOCSIFADDR:
1234		return dn_dev_ioctl(cmd, (void __user *)arg);
1235
1236	case SIOCATMARK:
1237		lock_sock(sk);
1238		val = !skb_queue_empty(&scp->other_receive_queue);
1239		if (scp->state != DN_RUN)
1240			val = -ENOTCONN;
1241		release_sock(sk);
1242		return val;
1243
1244	case TIOCOUTQ:
1245		amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1246		if (amount < 0)
1247			amount = 0;
1248		err = put_user(amount, (int __user *)arg);
1249		break;
1250
1251	case TIOCINQ:
1252		lock_sock(sk);
1253		skb = skb_peek(&scp->other_receive_queue);
1254		if (skb) {
1255			amount = skb->len;
1256		} else {
1257			skb_queue_walk(&sk->sk_receive_queue, skb)
1258				amount += skb->len;
1259		}
1260		release_sock(sk);
1261		err = put_user(amount, (int __user *)arg);
1262		break;
1263
1264	default:
1265		err = -ENOIOCTLCMD;
1266		break;
1267	}
1268
1269	return err;
1270}
1271
1272static int dn_listen(struct socket *sock, int backlog)
1273{
1274	struct sock *sk = sock->sk;
1275	int err = -EINVAL;
1276
1277	lock_sock(sk);
1278
1279	if (sock_flag(sk, SOCK_ZAPPED))
1280		goto out;
1281
1282	if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1283		goto out;
1284
1285	sk->sk_max_ack_backlog = backlog;
1286	sk->sk_ack_backlog     = 0;
1287	sk->sk_state           = TCP_LISTEN;
1288	err                 = 0;
1289	dn_rehash_sock(sk);
1290
1291out:
1292	release_sock(sk);
1293
1294	return err;
1295}
1296
1297
1298static int dn_shutdown(struct socket *sock, int how)
1299{
1300	struct sock *sk = sock->sk;
1301	struct dn_scp *scp = DN_SK(sk);
1302	int err = -ENOTCONN;
1303
1304	lock_sock(sk);
1305
1306	if (sock->state == SS_UNCONNECTED)
1307		goto out;
1308
1309	err = 0;
1310	if (sock->state == SS_DISCONNECTING)
1311		goto out;
1312
1313	err = -EINVAL;
1314	if (scp->state == DN_O)
1315		goto out;
1316
1317	if (how != SHUTDOWN_MASK)
1318		goto out;
1319
1320	sk->sk_shutdown = how;
1321	dn_destroy_sock(sk);
1322	err = 0;
1323
1324out:
1325	release_sock(sk);
1326
1327	return err;
1328}
1329
1330static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
 
1331{
1332	struct sock *sk = sock->sk;
1333	int err;
1334
1335	lock_sock(sk);
1336	err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1337	release_sock(sk);
 
 
 
 
 
 
1338
1339	return err;
1340}
1341
1342static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
 
1343{
1344	struct	sock *sk = sock->sk;
1345	struct dn_scp *scp = DN_SK(sk);
1346	long timeo;
1347	union {
1348		struct optdata_dn opt;
1349		struct accessdata_dn acc;
1350		int mode;
1351		unsigned long win;
1352		int val;
1353		unsigned char services;
1354		unsigned char info;
1355	} u;
1356	int err;
1357
1358	if (optlen && !optval)
1359		return -EINVAL;
1360
1361	if (optlen > sizeof(u))
1362		return -EINVAL;
1363
1364	if (copy_from_user(&u, optval, optlen))
1365		return -EFAULT;
1366
1367	switch (optname) {
1368	case DSO_CONDATA:
1369		if (sock->state == SS_CONNECTED)
1370			return -EISCONN;
1371		if ((scp->state != DN_O) && (scp->state != DN_CR))
1372			return -EINVAL;
1373
1374		if (optlen != sizeof(struct optdata_dn))
1375			return -EINVAL;
1376
1377		if (le16_to_cpu(u.opt.opt_optl) > 16)
1378			return -EINVAL;
1379
1380		memcpy(&scp->conndata_out, &u.opt, optlen);
1381		break;
1382
1383	case DSO_DISDATA:
1384		if (sock->state != SS_CONNECTED &&
1385		    scp->accept_mode == ACC_IMMED)
1386			return -ENOTCONN;
1387
1388		if (optlen != sizeof(struct optdata_dn))
1389			return -EINVAL;
1390
1391		if (le16_to_cpu(u.opt.opt_optl) > 16)
1392			return -EINVAL;
1393
1394		memcpy(&scp->discdata_out, &u.opt, optlen);
1395		break;
1396
1397	case DSO_CONACCESS:
1398		if (sock->state == SS_CONNECTED)
1399			return -EISCONN;
1400		if (scp->state != DN_O)
1401			return -EINVAL;
1402
1403		if (optlen != sizeof(struct accessdata_dn))
1404			return -EINVAL;
1405
1406		if ((u.acc.acc_accl > DN_MAXACCL) ||
1407		    (u.acc.acc_passl > DN_MAXACCL) ||
1408		    (u.acc.acc_userl > DN_MAXACCL))
1409			return -EINVAL;
1410
1411		memcpy(&scp->accessdata, &u.acc, optlen);
1412		break;
1413
1414	case DSO_ACCEPTMODE:
1415		if (sock->state == SS_CONNECTED)
1416			return -EISCONN;
1417		if (scp->state != DN_O)
1418			return -EINVAL;
1419
1420		if (optlen != sizeof(int))
1421			return -EINVAL;
1422
1423		if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1424			return -EINVAL;
1425
1426		scp->accept_mode = (unsigned char)u.mode;
1427		break;
1428
1429	case DSO_CONACCEPT:
1430		if (scp->state != DN_CR)
1431			return -EINVAL;
1432		timeo = sock_rcvtimeo(sk, 0);
1433		err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1434		return err;
1435
1436	case DSO_CONREJECT:
1437		if (scp->state != DN_CR)
1438			return -EINVAL;
1439
1440		scp->state = DN_DR;
1441		sk->sk_shutdown = SHUTDOWN_MASK;
1442		dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1443		break;
1444
1445	default:
1446#ifdef CONFIG_NETFILTER
1447		return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1448#endif
1449	case DSO_LINKINFO:
1450	case DSO_STREAM:
1451	case DSO_SEQPACKET:
1452		return -ENOPROTOOPT;
1453
1454	case DSO_MAXWINDOW:
1455		if (optlen != sizeof(unsigned long))
1456			return -EINVAL;
1457		if (u.win > NSP_MAX_WINDOW)
1458			u.win = NSP_MAX_WINDOW;
1459		if (u.win == 0)
1460			return -EINVAL;
1461		scp->max_window = u.win;
1462		if (scp->snd_window > u.win)
1463			scp->snd_window = u.win;
1464		break;
1465
1466	case DSO_NODELAY:
1467		if (optlen != sizeof(int))
1468			return -EINVAL;
1469		if (scp->nonagle == 2)
1470			return -EINVAL;
1471		scp->nonagle = (u.val == 0) ? 0 : 1;
1472		/* if (scp->nonagle == 1) { Push pending frames } */
1473		break;
1474
1475	case DSO_CORK:
1476		if (optlen != sizeof(int))
1477			return -EINVAL;
1478		if (scp->nonagle == 1)
1479			return -EINVAL;
1480		scp->nonagle = (u.val == 0) ? 0 : 2;
1481		/* if (scp->nonagle == 0) { Push pending frames } */
1482		break;
1483
1484	case DSO_SERVICES:
1485		if (optlen != sizeof(unsigned char))
1486			return -EINVAL;
1487		if ((u.services & ~NSP_FC_MASK) != 0x01)
1488			return -EINVAL;
1489		if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1490			return -EINVAL;
1491		scp->services_loc = u.services;
1492		break;
1493
1494	case DSO_INFO:
1495		if (optlen != sizeof(unsigned char))
1496			return -EINVAL;
1497		if (u.info & 0xfc)
1498			return -EINVAL;
1499		scp->info_loc = u.info;
1500		break;
 
 
 
 
 
 
1501	}
1502
1503	return 0;
1504}
1505
1506static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1507{
1508	struct sock *sk = sock->sk;
1509	int err;
1510
1511	lock_sock(sk);
1512	err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1513	release_sock(sk);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1514
1515	return err;
1516}
1517
1518static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1519{
1520	struct	sock *sk = sock->sk;
1521	struct dn_scp *scp = DN_SK(sk);
1522	struct linkinfo_dn link;
1523	unsigned int r_len;
1524	void *r_data = NULL;
1525	unsigned int val;
1526
1527	if(get_user(r_len , optlen))
1528		return -EFAULT;
1529
1530	switch (optname) {
1531	case DSO_CONDATA:
1532		if (r_len > sizeof(struct optdata_dn))
1533			r_len = sizeof(struct optdata_dn);
1534		r_data = &scp->conndata_in;
1535		break;
1536
1537	case DSO_DISDATA:
1538		if (r_len > sizeof(struct optdata_dn))
1539			r_len = sizeof(struct optdata_dn);
1540		r_data = &scp->discdata_in;
1541		break;
1542
1543	case DSO_CONACCESS:
1544		if (r_len > sizeof(struct accessdata_dn))
1545			r_len = sizeof(struct accessdata_dn);
1546		r_data = &scp->accessdata;
1547		break;
1548
1549	case DSO_ACCEPTMODE:
1550		if (r_len > sizeof(unsigned char))
1551			r_len = sizeof(unsigned char);
1552		r_data = &scp->accept_mode;
1553		break;
1554
1555	case DSO_LINKINFO:
1556		if (r_len > sizeof(struct linkinfo_dn))
1557			r_len = sizeof(struct linkinfo_dn);
1558
1559		memset(&link, 0, sizeof(link));
1560
1561		switch (sock->state) {
1562		case SS_CONNECTING:
1563			link.idn_linkstate = LL_CONNECTING;
1564			break;
1565		case SS_DISCONNECTING:
1566			link.idn_linkstate = LL_DISCONNECTING;
1567			break;
1568		case SS_CONNECTED:
1569			link.idn_linkstate = LL_RUNNING;
1570			break;
1571		default:
1572			link.idn_linkstate = LL_INACTIVE;
1573		}
1574
1575		link.idn_segsize = scp->segsize_rem;
1576		r_data = &link;
1577		break;
1578
1579	default:
1580#ifdef CONFIG_NETFILTER
1581	{
1582		int ret, len;
1583
1584		if (get_user(len, optlen))
1585			return -EFAULT;
1586
1587		ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1588		if (ret >= 0)
1589			ret = put_user(len, optlen);
1590		return ret;
1591	}
1592#endif
1593	case DSO_STREAM:
1594	case DSO_SEQPACKET:
1595	case DSO_CONACCEPT:
1596	case DSO_CONREJECT:
1597		return -ENOPROTOOPT;
1598
1599	case DSO_MAXWINDOW:
1600		if (r_len > sizeof(unsigned long))
1601			r_len = sizeof(unsigned long);
1602		r_data = &scp->max_window;
1603		break;
1604
1605	case DSO_NODELAY:
1606		if (r_len > sizeof(int))
1607			r_len = sizeof(int);
1608		val = (scp->nonagle == 1);
1609		r_data = &val;
1610		break;
1611
1612	case DSO_CORK:
1613		if (r_len > sizeof(int))
1614			r_len = sizeof(int);
1615		val = (scp->nonagle == 2);
1616		r_data = &val;
1617		break;
1618
1619	case DSO_SERVICES:
1620		if (r_len > sizeof(unsigned char))
1621			r_len = sizeof(unsigned char);
1622		r_data = &scp->services_rem;
1623		break;
1624
1625	case DSO_INFO:
1626		if (r_len > sizeof(unsigned char))
1627			r_len = sizeof(unsigned char);
1628		r_data = &scp->info_rem;
1629		break;
 
 
 
 
 
 
 
1630	}
1631
1632	if (r_data) {
1633		if (copy_to_user(optval, r_data, r_len))
1634			return -EFAULT;
1635		if (put_user(r_len, optlen))
1636			return -EFAULT;
1637	}
1638
1639	return 0;
1640}
1641
1642
1643static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1644{
1645	struct sk_buff *skb;
1646	int len = 0;
1647
1648	if (flags & MSG_OOB)
1649		return !skb_queue_empty(q) ? 1 : 0;
1650
1651	skb_queue_walk(q, skb) {
1652		struct dn_skb_cb *cb = DN_SKB_CB(skb);
1653		len += skb->len;
1654
1655		if (cb->nsp_flags & 0x40) {
1656			/* SOCK_SEQPACKET reads to EOM */
1657			if (sk->sk_type == SOCK_SEQPACKET)
1658				return 1;
1659			/* so does SOCK_STREAM unless WAITALL is specified */
1660			if (!(flags & MSG_WAITALL))
1661				return 1;
1662		}
1663
1664		/* minimum data length for read exceeded */
1665		if (len >= target)
1666			return 1;
1667	}
1668
1669	return 0;
1670}
1671
1672
1673static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1674	struct msghdr *msg, size_t size, int flags)
1675{
1676	struct sock *sk = sock->sk;
1677	struct dn_scp *scp = DN_SK(sk);
1678	struct sk_buff_head *queue = &sk->sk_receive_queue;
1679	size_t target = size > 1 ? 1 : 0;
1680	size_t copied = 0;
1681	int rv = 0;
1682	struct sk_buff *skb, *n;
1683	struct dn_skb_cb *cb = NULL;
1684	unsigned char eor = 0;
1685	long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1686
1687	lock_sock(sk);
1688
1689	if (sock_flag(sk, SOCK_ZAPPED)) {
1690		rv = -EADDRNOTAVAIL;
1691		goto out;
1692	}
1693
1694	if (sk->sk_shutdown & RCV_SHUTDOWN) {
1695		rv = 0;
1696		goto out;
1697	}
1698
1699	rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1700	if (rv)
1701		goto out;
1702
1703	if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1704		rv = -EOPNOTSUPP;
1705		goto out;
1706	}
1707
1708	if (flags & MSG_OOB)
1709		queue = &scp->other_receive_queue;
1710
1711	if (flags & MSG_WAITALL)
1712		target = size;
1713
1714
1715	/*
1716	 * See if there is data ready to read, sleep if there isn't
1717	 */
1718	for(;;) {
1719		DEFINE_WAIT(wait);
1720
1721		if (sk->sk_err)
1722			goto out;
1723
1724		if (!skb_queue_empty(&scp->other_receive_queue)) {
1725			if (!(flags & MSG_OOB)) {
1726				msg->msg_flags |= MSG_OOB;
1727				if (!scp->other_report) {
1728					scp->other_report = 1;
1729					goto out;
1730				}
1731			}
1732		}
1733
1734		if (scp->state != DN_RUN)
1735			goto out;
1736
1737		if (signal_pending(current)) {
1738			rv = sock_intr_errno(timeo);
1739			goto out;
1740		}
1741
1742		if (dn_data_ready(sk, queue, flags, target))
1743			break;
1744
1745		if (flags & MSG_DONTWAIT) {
1746			rv = -EWOULDBLOCK;
1747			goto out;
1748		}
1749
1750		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1751		set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1752		sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1753		clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1754		finish_wait(sk_sleep(sk), &wait);
1755	}
1756
1757	skb_queue_walk_safe(queue, skb, n) {
1758		unsigned int chunk = skb->len;
1759		cb = DN_SKB_CB(skb);
1760
1761		if ((chunk + copied) > size)
1762			chunk = size - copied;
1763
1764		if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1765			rv = -EFAULT;
1766			break;
1767		}
1768		copied += chunk;
1769
1770		if (!(flags & MSG_PEEK))
1771			skb_pull(skb, chunk);
1772
1773		eor = cb->nsp_flags & 0x40;
1774
1775		if (skb->len == 0) {
1776			skb_unlink(skb, queue);
1777			kfree_skb(skb);
1778			/*
1779			 * N.B. Don't refer to skb or cb after this point
1780			 * in loop.
1781			 */
1782			if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1783				scp->flowloc_sw = DN_SEND;
1784				dn_nsp_send_link(sk, DN_SEND, 0);
1785			}
1786		}
1787
1788		if (eor) {
1789			if (sk->sk_type == SOCK_SEQPACKET)
1790				break;
1791			if (!(flags & MSG_WAITALL))
1792				break;
1793		}
1794
1795		if (flags & MSG_OOB)
1796			break;
1797
1798		if (copied >= target)
1799			break;
1800	}
1801
1802	rv = copied;
1803
1804
1805	if (eor && (sk->sk_type == SOCK_SEQPACKET))
1806		msg->msg_flags |= MSG_EOR;
1807
1808out:
1809	if (rv == 0)
1810		rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1811
1812	if ((rv >= 0) && msg->msg_name) {
 
1813		memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1814		msg->msg_namelen = sizeof(struct sockaddr_dn);
1815	}
1816
1817	release_sock(sk);
1818
1819	return rv;
1820}
1821
1822
1823static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1824{
1825	unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1826	if (skb_queue_len(queue) >= scp->snd_window)
1827		return 1;
1828	if (fctype != NSP_FC_NONE) {
1829		if (flags & MSG_OOB) {
1830			if (scp->flowrem_oth == 0)
1831				return 1;
1832		} else {
1833			if (scp->flowrem_dat == 0)
1834				return 1;
1835		}
1836	}
1837	return 0;
1838}
1839
1840/*
1841 * The DECnet spec requires that the "routing layer" accepts packets which
1842 * are at least 230 bytes in size. This excludes any headers which the NSP
1843 * layer might add, so we always assume that we'll be using the maximal
1844 * length header on data packets. The variation in length is due to the
1845 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1846 * make much practical difference.
1847 */
1848unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1849{
1850	unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1851	if (dev) {
1852		struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1853		mtu -= LL_RESERVED_SPACE(dev);
1854		if (dn_db->use_long)
1855			mtu -= 21;
1856		else
1857			mtu -= 6;
1858		mtu -= DN_MAX_NSP_DATA_HEADER;
1859	} else {
1860		/*
1861		 * 21 = long header, 16 = guess at MAC header length
1862		 */
1863		mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1864	}
1865	if (mtu > mss)
1866		mss = mtu;
1867	return mss;
1868}
1869
1870static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1871{
1872	struct dst_entry *dst = __sk_dst_get(sk);
1873	struct dn_scp *scp = DN_SK(sk);
1874	int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1875
1876	/* Other data messages are limited to 16 bytes per packet */
1877	if (flags & MSG_OOB)
1878		return 16;
1879
1880	/* This works out the maximum size of segment we can send out */
1881	if (dst) {
1882		u32 mtu = dst_mtu(dst);
1883		mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1884	}
1885
1886	return mss_now;
1887}
1888
1889/*
1890 * N.B. We get the timeout wrong here, but then we always did get it
1891 * wrong before and this is another step along the road to correcting
1892 * it. It ought to get updated each time we pass through the routine,
1893 * but in practise it probably doesn't matter too much for now.
1894 */
1895static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1896			      unsigned long datalen, int noblock,
1897			      int *errcode)
1898{
1899	struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1900						   noblock, errcode);
1901	if (skb) {
1902		skb->protocol = htons(ETH_P_DNA_RT);
1903		skb->pkt_type = PACKET_OUTGOING;
1904	}
1905	return skb;
1906}
1907
1908static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1909		      struct msghdr *msg, size_t size)
1910{
1911	struct sock *sk = sock->sk;
1912	struct dn_scp *scp = DN_SK(sk);
1913	size_t mss;
1914	struct sk_buff_head *queue = &scp->data_xmit_queue;
1915	int flags = msg->msg_flags;
1916	int err = 0;
1917	size_t sent = 0;
1918	int addr_len = msg->msg_namelen;
1919	struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1920	struct sk_buff *skb = NULL;
1921	struct dn_skb_cb *cb;
1922	size_t len;
1923	unsigned char fctype;
1924	long timeo;
1925
1926	if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1927		return -EOPNOTSUPP;
1928
1929	if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1930		return -EINVAL;
1931
1932	lock_sock(sk);
1933	timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1934	/*
1935	 * The only difference between stream sockets and sequenced packet
1936	 * sockets is that the stream sockets always behave as if MSG_EOR
1937	 * has been set.
1938	 */
1939	if (sock->type == SOCK_STREAM) {
1940		if (flags & MSG_EOR) {
1941			err = -EINVAL;
1942			goto out;
1943		}
1944		flags |= MSG_EOR;
1945	}
1946
1947
1948	err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1949	if (err)
1950		goto out_err;
1951
1952	if (sk->sk_shutdown & SEND_SHUTDOWN) {
1953		err = -EPIPE;
1954		if (!(flags & MSG_NOSIGNAL))
1955			send_sig(SIGPIPE, current, 0);
1956		goto out_err;
1957	}
1958
1959	if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1960		dst_negative_advice(sk);
1961
1962	mss = scp->segsize_rem;
1963	fctype = scp->services_rem & NSP_FC_MASK;
1964
1965	mss = dn_current_mss(sk, flags);
1966
1967	if (flags & MSG_OOB) {
1968		queue = &scp->other_xmit_queue;
1969		if (size > mss) {
1970			err = -EMSGSIZE;
1971			goto out;
1972		}
1973	}
1974
1975	scp->persist_fxn = dn_nsp_xmit_timeout;
1976
1977	while(sent < size) {
1978		err = sock_error(sk);
1979		if (err)
1980			goto out;
1981
1982		if (signal_pending(current)) {
1983			err = sock_intr_errno(timeo);
1984			goto out;
1985		}
1986
1987		/*
1988		 * Calculate size that we wish to send.
1989		 */
1990		len = size - sent;
1991
1992		if (len > mss)
1993			len = mss;
1994
1995		/*
1996		 * Wait for queue size to go down below the window
1997		 * size.
1998		 */
1999		if (dn_queue_too_long(scp, queue, flags)) {
2000			DEFINE_WAIT(wait);
2001
2002			if (flags & MSG_DONTWAIT) {
2003				err = -EWOULDBLOCK;
2004				goto out;
2005			}
2006
2007			prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2008			set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2009			sk_wait_event(sk, &timeo,
2010				      !dn_queue_too_long(scp, queue, flags));
2011			clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2012			finish_wait(sk_sleep(sk), &wait);
2013			continue;
2014		}
2015
2016		/*
2017		 * Get a suitably sized skb.
2018		 * 64 is a bit of a hack really, but its larger than any
2019		 * link-layer headers and has served us well as a good
2020		 * guess as to their real length.
2021		 */
2022		skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2023					 flags & MSG_DONTWAIT, &err);
2024
2025		if (err)
2026			break;
2027
2028		if (!skb)
2029			continue;
2030
2031		cb = DN_SKB_CB(skb);
2032
2033		skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2034
2035		if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2036			err = -EFAULT;
2037			goto out;
2038		}
2039
2040		if (flags & MSG_OOB) {
2041			cb->nsp_flags = 0x30;
2042			if (fctype != NSP_FC_NONE)
2043				scp->flowrem_oth--;
2044		} else {
2045			cb->nsp_flags = 0x00;
2046			if (scp->seg_total == 0)
2047				cb->nsp_flags |= 0x20;
2048
2049			scp->seg_total += len;
2050
2051			if (((sent + len) == size) && (flags & MSG_EOR)) {
2052				cb->nsp_flags |= 0x40;
2053				scp->seg_total = 0;
2054				if (fctype == NSP_FC_SCMC)
2055					scp->flowrem_dat--;
2056			}
2057			if (fctype == NSP_FC_SRC)
2058				scp->flowrem_dat--;
2059		}
2060
2061		sent += len;
2062		dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2063		skb = NULL;
2064
2065		scp->persist = dn_nsp_persist(sk);
2066
2067	}
2068out:
2069
2070	kfree_skb(skb);
2071
2072	release_sock(sk);
2073
2074	return sent ? sent : err;
2075
2076out_err:
2077	err = sk_stream_error(sk, flags, err);
2078	release_sock(sk);
2079	return err;
2080}
2081
2082static int dn_device_event(struct notifier_block *this, unsigned long event,
2083			void *ptr)
2084{
2085	struct net_device *dev = (struct net_device *)ptr;
2086
2087	if (!net_eq(dev_net(dev), &init_net))
2088		return NOTIFY_DONE;
2089
2090	switch (event) {
2091	case NETDEV_UP:
2092		dn_dev_up(dev);
2093		break;
2094	case NETDEV_DOWN:
2095		dn_dev_down(dev);
2096		break;
2097	default:
2098		break;
2099	}
2100
2101	return NOTIFY_DONE;
2102}
2103
2104static struct notifier_block dn_dev_notifier = {
2105	.notifier_call = dn_device_event,
2106};
2107
2108extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2109
2110static struct packet_type dn_dix_packet_type __read_mostly = {
2111	.type =		cpu_to_be16(ETH_P_DNA_RT),
2112	.func =		dn_route_rcv,
2113};
2114
2115#ifdef CONFIG_PROC_FS
2116struct dn_iter_state {
2117	int bucket;
2118};
2119
2120static struct sock *dn_socket_get_first(struct seq_file *seq)
2121{
2122	struct dn_iter_state *state = seq->private;
2123	struct sock *n = NULL;
2124
2125	for(state->bucket = 0;
2126	    state->bucket < DN_SK_HASH_SIZE;
2127	    ++state->bucket) {
2128		n = sk_head(&dn_sk_hash[state->bucket]);
2129		if (n)
2130			break;
2131	}
2132
2133	return n;
2134}
2135
2136static struct sock *dn_socket_get_next(struct seq_file *seq,
2137				       struct sock *n)
2138{
2139	struct dn_iter_state *state = seq->private;
2140
2141	n = sk_next(n);
2142try_again:
2143	if (n)
2144		goto out;
2145	if (++state->bucket >= DN_SK_HASH_SIZE)
2146		goto out;
2147	n = sk_head(&dn_sk_hash[state->bucket]);
2148	goto try_again;
2149out:
2150	return n;
2151}
2152
2153static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2154{
2155	struct sock *sk = dn_socket_get_first(seq);
2156
2157	if (sk) {
2158		while(*pos && (sk = dn_socket_get_next(seq, sk)))
2159			--*pos;
2160	}
2161	return *pos ? NULL : sk;
2162}
2163
2164static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2165{
2166	void *rc;
2167	read_lock_bh(&dn_hash_lock);
2168	rc = socket_get_idx(seq, &pos);
2169	if (!rc) {
2170		read_unlock_bh(&dn_hash_lock);
2171	}
2172	return rc;
2173}
2174
2175static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2176{
2177	return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2178}
2179
2180static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2181{
2182	void *rc;
2183
2184	if (v == SEQ_START_TOKEN) {
2185		rc = dn_socket_get_idx(seq, 0);
2186		goto out;
2187	}
2188
2189	rc = dn_socket_get_next(seq, v);
2190	if (rc)
2191		goto out;
2192	read_unlock_bh(&dn_hash_lock);
2193out:
2194	++*pos;
2195	return rc;
2196}
2197
2198static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2199{
2200	if (v && v != SEQ_START_TOKEN)
2201		read_unlock_bh(&dn_hash_lock);
2202}
2203
2204#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2205
2206static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2207{
2208	int i;
2209
2210	switch (le16_to_cpu(dn->sdn_objnamel)) {
2211	case 0:
2212		sprintf(buf, "%d", dn->sdn_objnum);
2213		break;
2214	default:
2215		for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2216			buf[i] = dn->sdn_objname[i];
2217			if (IS_NOT_PRINTABLE(buf[i]))
2218				buf[i] = '.';
2219		}
2220		buf[i] = 0;
2221	}
2222}
2223
2224static char *dn_state2asc(unsigned char state)
2225{
2226	switch (state) {
2227	case DN_O:
2228		return "OPEN";
2229	case DN_CR:
2230		return "  CR";
2231	case DN_DR:
2232		return "  DR";
2233	case DN_DRC:
2234		return " DRC";
2235	case DN_CC:
2236		return "  CC";
2237	case DN_CI:
2238		return "  CI";
2239	case DN_NR:
2240		return "  NR";
2241	case DN_NC:
2242		return "  NC";
2243	case DN_CD:
2244		return "  CD";
2245	case DN_RJ:
2246		return "  RJ";
2247	case DN_RUN:
2248		return " RUN";
2249	case DN_DI:
2250		return "  DI";
2251	case DN_DIC:
2252		return " DIC";
2253	case DN_DN:
2254		return "  DN";
2255	case DN_CL:
2256		return "  CL";
2257	case DN_CN:
2258		return "  CN";
2259	}
2260
2261	return "????";
2262}
2263
2264static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2265{
2266	struct dn_scp *scp = DN_SK(sk);
2267	char buf1[DN_ASCBUF_LEN];
2268	char buf2[DN_ASCBUF_LEN];
2269	char local_object[DN_MAXOBJL+3];
2270	char remote_object[DN_MAXOBJL+3];
2271
2272	dn_printable_object(&scp->addr, local_object);
2273	dn_printable_object(&scp->peer, remote_object);
2274
2275	seq_printf(seq,
2276		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2277		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2278		   dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2279		   scp->addrloc,
2280		   scp->numdat,
2281		   scp->numoth,
2282		   scp->ackxmt_dat,
2283		   scp->ackxmt_oth,
2284		   scp->flowloc_sw,
2285		   local_object,
2286		   dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2287		   scp->addrrem,
2288		   scp->numdat_rcv,
2289		   scp->numoth_rcv,
2290		   scp->ackrcv_dat,
2291		   scp->ackrcv_oth,
2292		   scp->flowrem_sw,
2293		   remote_object,
2294		   dn_state2asc(scp->state),
2295		   ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2296}
2297
2298static int dn_socket_seq_show(struct seq_file *seq, void *v)
2299{
2300	if (v == SEQ_START_TOKEN) {
2301		seq_puts(seq, "Local                                              Remote\n");
2302	} else {
2303		dn_socket_format_entry(seq, v);
2304	}
2305	return 0;
2306}
2307
2308static const struct seq_operations dn_socket_seq_ops = {
2309	.start	= dn_socket_seq_start,
2310	.next	= dn_socket_seq_next,
2311	.stop	= dn_socket_seq_stop,
2312	.show	= dn_socket_seq_show,
2313};
2314
2315static int dn_socket_seq_open(struct inode *inode, struct file *file)
2316{
2317	return seq_open_private(file, &dn_socket_seq_ops,
2318			sizeof(struct dn_iter_state));
2319}
2320
2321static const struct file_operations dn_socket_seq_fops = {
2322	.owner		= THIS_MODULE,
2323	.open		= dn_socket_seq_open,
2324	.read		= seq_read,
2325	.llseek		= seq_lseek,
2326	.release	= seq_release_private,
2327};
2328#endif
2329
2330static const struct net_proto_family	dn_family_ops = {
2331	.family =	AF_DECnet,
2332	.create =	dn_create,
2333	.owner	=	THIS_MODULE,
2334};
2335
2336static const struct proto_ops dn_proto_ops = {
2337	.family =	AF_DECnet,
2338	.owner =	THIS_MODULE,
2339	.release =	dn_release,
2340	.bind =		dn_bind,
2341	.connect =	dn_connect,
2342	.socketpair =	sock_no_socketpair,
2343	.accept =	dn_accept,
2344	.getname =	dn_getname,
2345	.poll =		dn_poll,
2346	.ioctl =	dn_ioctl,
2347	.listen =	dn_listen,
2348	.shutdown =	dn_shutdown,
2349	.setsockopt =	dn_setsockopt,
2350	.getsockopt =	dn_getsockopt,
2351	.sendmsg =	dn_sendmsg,
2352	.recvmsg =	dn_recvmsg,
2353	.mmap =		sock_no_mmap,
2354	.sendpage =	sock_no_sendpage,
2355};
2356
2357void dn_register_sysctl(void);
2358void dn_unregister_sysctl(void);
2359
2360MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2361MODULE_AUTHOR("Linux DECnet Project Team");
2362MODULE_LICENSE("GPL");
2363MODULE_ALIAS_NETPROTO(PF_DECnet);
2364
2365static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
 
2366
2367static int __init decnet_init(void)
2368{
2369	int rc;
2370
2371	printk(banner);
2372
2373	rc = proto_register(&dn_proto, 1);
2374	if (rc != 0)
2375		goto out;
2376
2377	dn_neigh_init();
2378	dn_dev_init();
2379	dn_route_init();
2380	dn_fib_init();
2381
2382	sock_register(&dn_family_ops);
2383	dev_add_pack(&dn_dix_packet_type);
2384	register_netdevice_notifier(&dn_dev_notifier);
2385
2386	proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
 
 
2387	dn_register_sysctl();
2388out:
2389	return rc;
2390
2391}
2392module_init(decnet_init);
2393
2394/*
2395 * Prevent DECnet module unloading until its fixed properly.
2396 * Requires an audit of the code to check for memory leaks and
2397 * initialisation problems etc.
2398 */
2399#if 0
2400static void __exit decnet_exit(void)
2401{
2402	sock_unregister(AF_DECnet);
2403	rtnl_unregister_all(PF_DECnet);
2404	dev_remove_pack(&dn_dix_packet_type);
2405
2406	dn_unregister_sysctl();
2407
2408	unregister_netdevice_notifier(&dn_dev_notifier);
2409
2410	dn_route_cleanup();
2411	dn_dev_cleanup();
2412	dn_neigh_cleanup();
2413	dn_fib_cleanup();
2414
2415	proc_net_remove(&init_net, "decnet");
2416
2417	proto_unregister(&dn_proto);
2418
2419	rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2420}
2421module_exit(decnet_exit);
2422#endif