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/ioctls.h>
 123#include <linux/capability.h>
 124#include <linux/mm.h>
 125#include <linux/interrupt.h>
 126#include <linux/proc_fs.h>
 127#include <linux/stat.h>
 128#include <linux/init.h>
 129#include <linux/poll.h>
 130#include <linux/jiffies.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
 180	if (port == 0)
 181		return -1;
 182
 183	sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
 184		struct dn_scp *scp = DN_SK(sk);
 185		if (scp->addrloc == port)
 186			return -1;
 187	}
 188	return 0;
 189}
 190
 191static unsigned short port_alloc(struct sock *sk)
 192{
 193	struct dn_scp *scp = DN_SK(sk);
 194static unsigned short port = 0x2000;
 195	unsigned short i_port = port;
 196
 197	while(check_port(cpu_to_le16(++port)) != 0) {
 198		if (port == i_port)
 199			return 0;
 200	}
 201
 202	scp->addrloc = cpu_to_le16(port);
 203
 204	return 1;
 205}
 206
 207/*
 208 * Since this is only ever called from user
 209 * level, we don't need a write_lock() version
 210 * of this.
 211 */
 212static int dn_hash_sock(struct sock *sk)
 213{
 214	struct dn_scp *scp = DN_SK(sk);
 215	struct hlist_head *list;
 216	int rv = -EUSERS;
 217
 218	BUG_ON(sk_hashed(sk));
 219
 220	write_lock_bh(&dn_hash_lock);
 221
 222	if (!scp->addrloc && !port_alloc(sk))
 223		goto out;
 224
 225	rv = -EADDRINUSE;
 226	if ((list = dn_find_list(sk)) == NULL)
 227		goto out;
 228
 229	sk_add_node(sk, list);
 230	rv = 0;
 231out:
 232	write_unlock_bh(&dn_hash_lock);
 233	return rv;
 234}
 235
 236static void dn_unhash_sock(struct sock *sk)
 237{
 238	write_lock(&dn_hash_lock);
 239	sk_del_node_init(sk);
 240	write_unlock(&dn_hash_lock);
 241}
 242
 243static void dn_unhash_sock_bh(struct sock *sk)
 244{
 245	write_lock_bh(&dn_hash_lock);
 246	sk_del_node_init(sk);
 247	write_unlock_bh(&dn_hash_lock);
 248}
 249
 250static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 251{
 252	int i;
 253	unsigned int hash = addr->sdn_objnum;
 254
 255	if (hash == 0) {
 256		hash = addr->sdn_objnamel;
 257		for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
 258			hash ^= addr->sdn_objname[i];
 259			hash ^= (hash << 3);
 260		}
 261	}
 262
 263	return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 264}
 265
 266/*
 267 * Called to transform a socket from bound (i.e. with a local address)
 268 * into a listening socket (doesn't need a local port number) and rehashes
 269 * based upon the object name/number.
 270 */
 271static void dn_rehash_sock(struct sock *sk)
 272{
 273	struct hlist_head *list;
 274	struct dn_scp *scp = DN_SK(sk);
 275
 276	if (scp->addr.sdn_flags & SDF_WILD)
 277		return;
 278
 279	write_lock_bh(&dn_hash_lock);
 280	sk_del_node_init(sk);
 281	DN_SK(sk)->addrloc = 0;
 282	list = listen_hash(&DN_SK(sk)->addr);
 283	sk_add_node(sk, list);
 284	write_unlock_bh(&dn_hash_lock);
 285}
 286
 287int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 288{
 289	int len = 2;
 290
 291	*buf++ = type;
 292
 293	switch (type) {
 294	case 0:
 295		*buf++ = sdn->sdn_objnum;
 296		break;
 297	case 1:
 298		*buf++ = 0;
 299		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
 300		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 301		len = 3 + le16_to_cpu(sdn->sdn_objnamel);
 302		break;
 303	case 2:
 304		memset(buf, 0, 5);
 305		buf += 5;
 306		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
 307		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 308		len = 7 + le16_to_cpu(sdn->sdn_objnamel);
 309		break;
 310	}
 311
 312	return len;
 313}
 314
 315/*
 316 * On reception of usernames, we handle types 1 and 0 for destination
 317 * addresses only. Types 2 and 4 are used for source addresses, but the
 318 * UIC, GIC are ignored and they are both treated the same way. Type 3
 319 * is never used as I've no idea what its purpose might be or what its
 320 * format is.
 321 */
 322int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 323{
 324	unsigned char type;
 325	int size = len;
 326	int namel = 12;
 327
 328	sdn->sdn_objnum = 0;
 329	sdn->sdn_objnamel = cpu_to_le16(0);
 330	memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 331
 332	if (len < 2)
 333		return -1;
 334
 335	len -= 2;
 336	*fmt = *data++;
 337	type = *data++;
 338
 339	switch (*fmt) {
 340	case 0:
 341		sdn->sdn_objnum = type;
 342		return 2;
 343	case 1:
 344		namel = 16;
 345		break;
 346	case 2:
 347		len  -= 4;
 348		data += 4;
 349		break;
 350	case 4:
 351		len  -= 8;
 352		data += 8;
 353		break;
 354	default:
 355		return -1;
 356	}
 357
 358	len -= 1;
 359
 360	if (len < 0)
 361		return -1;
 362
 363	sdn->sdn_objnamel = cpu_to_le16(*data++);
 364	len -= le16_to_cpu(sdn->sdn_objnamel);
 365
 366	if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
 367		return -1;
 368
 369	memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
 370
 371	return size - len;
 372}
 373
 374struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 375{
 376	struct hlist_head *list = listen_hash(addr);
 377	struct sock *sk;
 378
 379	read_lock(&dn_hash_lock);
 380	sk_for_each(sk, list) {
 381		struct dn_scp *scp = DN_SK(sk);
 382		if (sk->sk_state != TCP_LISTEN)
 383			continue;
 384		if (scp->addr.sdn_objnum) {
 385			if (scp->addr.sdn_objnum != addr->sdn_objnum)
 386				continue;
 387		} else {
 388			if (addr->sdn_objnum)
 389				continue;
 390			if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 391				continue;
 392			if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
 393				continue;
 394		}
 395		sock_hold(sk);
 396		read_unlock(&dn_hash_lock);
 397		return sk;
 398	}
 399
 400	sk = sk_head(&dn_wild_sk);
 401	if (sk) {
 402		if (sk->sk_state == TCP_LISTEN)
 403			sock_hold(sk);
 404		else
 405			sk = NULL;
 406	}
 407
 408	read_unlock(&dn_hash_lock);
 409	return sk;
 410}
 411
 412struct sock *dn_find_by_skb(struct sk_buff *skb)
 413{
 414	struct dn_skb_cb *cb = DN_SKB_CB(skb);
 415	struct sock *sk;
 416	struct dn_scp *scp;
 417
 418	read_lock(&dn_hash_lock);
 419	sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
 420		scp = DN_SK(sk);
 421		if (cb->src != dn_saddr2dn(&scp->peer))
 422			continue;
 423		if (cb->dst_port != scp->addrloc)
 424			continue;
 425		if (scp->addrrem && (cb->src_port != scp->addrrem))
 426			continue;
 427		sock_hold(sk);
 428		goto found;
 429	}
 430	sk = NULL;
 431found:
 432	read_unlock(&dn_hash_lock);
 433	return sk;
 434}
 435
 436
 437
 438static void dn_destruct(struct sock *sk)
 439{
 440	struct dn_scp *scp = DN_SK(sk);
 441
 442	skb_queue_purge(&scp->data_xmit_queue);
 443	skb_queue_purge(&scp->other_xmit_queue);
 444	skb_queue_purge(&scp->other_receive_queue);
 445
 446	dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
 447}
 448
 449static int dn_memory_pressure;
 450
 451static void dn_enter_memory_pressure(struct sock *sk)
 452{
 453	if (!dn_memory_pressure) {
 454		dn_memory_pressure = 1;
 455	}
 456}
 457
 458static struct proto dn_proto = {
 459	.name			= "NSP",
 460	.owner			= THIS_MODULE,
 461	.enter_memory_pressure	= dn_enter_memory_pressure,
 462	.memory_pressure	= &dn_memory_pressure,
 463	.memory_allocated	= &decnet_memory_allocated,
 464	.sysctl_mem		= sysctl_decnet_mem,
 465	.sysctl_wmem		= sysctl_decnet_wmem,
 466	.sysctl_rmem		= sysctl_decnet_rmem,
 467	.max_header		= DN_MAX_NSP_DATA_HEADER + 64,
 468	.obj_size		= sizeof(struct dn_sock),
 469};
 470
 471static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
 472{
 473	struct dn_scp *scp;
 474	struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
 475
 476	if  (!sk)
 477		goto out;
 478
 479	if (sock)
 480		sock->ops = &dn_proto_ops;
 481	sock_init_data(sock, sk);
 482
 483	sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 484	sk->sk_destruct    = dn_destruct;
 485	sk->sk_no_check_tx = 1;
 486	sk->sk_family      = PF_DECnet;
 487	sk->sk_protocol    = 0;
 488	sk->sk_allocation  = gfp;
 489	sk->sk_sndbuf	   = sysctl_decnet_wmem[1];
 490	sk->sk_rcvbuf	   = sysctl_decnet_rmem[1];
 491
 492	/* Initialization of DECnet Session Control Port		*/
 493	scp = DN_SK(sk);
 494	scp->state	= DN_O;		/* Open			*/
 495	scp->numdat	= 1;		/* Next data seg to tx	*/
 496	scp->numoth	= 1;		/* Next oth data to tx  */
 497	scp->ackxmt_dat = 0;		/* Last data seg ack'ed */
 498	scp->ackxmt_oth = 0;		/* Last oth data ack'ed */
 499	scp->ackrcv_dat = 0;		/* Highest data ack recv*/
 500	scp->ackrcv_oth = 0;		/* Last oth data ack rec*/
 501	scp->flowrem_sw = DN_SEND;
 502	scp->flowloc_sw = DN_SEND;
 503	scp->flowrem_dat = 0;
 504	scp->flowrem_oth = 1;
 505	scp->flowloc_dat = 0;
 506	scp->flowloc_oth = 1;
 507	scp->services_rem = 0;
 508	scp->services_loc = 1 | NSP_FC_NONE;
 509	scp->info_rem = 0;
 510	scp->info_loc = 0x03; /* NSP version 4.1 */
 511	scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 512	scp->nonagle = 0;
 513	scp->multi_ireq = 1;
 514	scp->accept_mode = ACC_IMMED;
 515	scp->addr.sdn_family    = AF_DECnet;
 516	scp->peer.sdn_family    = AF_DECnet;
 517	scp->accessdata.acc_accl = 5;
 518	memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 519
 520	scp->max_window   = NSP_MAX_WINDOW;
 521	scp->snd_window   = NSP_MIN_WINDOW;
 522	scp->nsp_srtt     = NSP_INITIAL_SRTT;
 523	scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 524	scp->nsp_rxtshift = 0;
 525
 526	skb_queue_head_init(&scp->data_xmit_queue);
 527	skb_queue_head_init(&scp->other_xmit_queue);
 528	skb_queue_head_init(&scp->other_receive_queue);
 529
 530	scp->persist = 0;
 531	scp->persist_fxn = NULL;
 532	scp->keepalive = 10 * HZ;
 533	scp->keepalive_fxn = dn_keepalive;
 534
 535	init_timer(&scp->delack_timer);
 536	scp->delack_pending = 0;
 537	scp->delack_fxn = dn_nsp_delayed_ack;
 538
 539	dn_start_slow_timer(sk);
 540out:
 541	return sk;
 542}
 543
 544/*
 545 * Keepalive timer.
 546 * FIXME: Should respond to SO_KEEPALIVE etc.
 547 */
 548static void dn_keepalive(struct sock *sk)
 549{
 550	struct dn_scp *scp = DN_SK(sk);
 551
 552	/*
 553	 * By checking the other_data transmit queue is empty
 554	 * we are double checking that we are not sending too
 555	 * many of these keepalive frames.
 556	 */
 557	if (skb_queue_empty(&scp->other_xmit_queue))
 558		dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 559}
 560
 561
 562/*
 563 * Timer for shutdown/destroyed sockets.
 564 * When socket is dead & no packets have been sent for a
 565 * certain amount of time, they are removed by this
 566 * routine. Also takes care of sending out DI & DC
 567 * frames at correct times.
 568 */
 569int dn_destroy_timer(struct sock *sk)
 570{
 571	struct dn_scp *scp = DN_SK(sk);
 572
 573	scp->persist = dn_nsp_persist(sk);
 574
 575	switch (scp->state) {
 576	case DN_DI:
 577		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 578		if (scp->nsp_rxtshift >= decnet_di_count)
 579			scp->state = DN_CN;
 580		return 0;
 581
 582	case DN_DR:
 583		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 584		if (scp->nsp_rxtshift >= decnet_dr_count)
 585			scp->state = DN_DRC;
 586		return 0;
 587
 588	case DN_DN:
 589		if (scp->nsp_rxtshift < decnet_dn_count) {
 590			/* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 591			dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 592					 GFP_ATOMIC);
 593			return 0;
 594		}
 595	}
 596
 597	scp->persist = (HZ * decnet_time_wait);
 598
 599	if (sk->sk_socket)
 600		return 0;
 601
 602	if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
 603		dn_unhash_sock(sk);
 604		sock_put(sk);
 605		return 1;
 606	}
 607
 608	return 0;
 609}
 610
 611static void dn_destroy_sock(struct sock *sk)
 612{
 613	struct dn_scp *scp = DN_SK(sk);
 614
 615	scp->nsp_rxtshift = 0; /* reset back off */
 616
 617	if (sk->sk_socket) {
 618		if (sk->sk_socket->state != SS_UNCONNECTED)
 619			sk->sk_socket->state = SS_DISCONNECTING;
 620	}
 621
 622	sk->sk_state = TCP_CLOSE;
 623
 624	switch (scp->state) {
 625	case DN_DN:
 626		dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 627				 sk->sk_allocation);
 628		scp->persist_fxn = dn_destroy_timer;
 629		scp->persist = dn_nsp_persist(sk);
 630		break;
 631	case DN_CR:
 632		scp->state = DN_DR;
 633		goto disc_reject;
 634	case DN_RUN:
 635		scp->state = DN_DI;
 
 636	case DN_DI:
 637	case DN_DR:
 638disc_reject:
 639		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 
 640	case DN_NC:
 641	case DN_NR:
 642	case DN_RJ:
 643	case DN_DIC:
 644	case DN_CN:
 645	case DN_DRC:
 646	case DN_CI:
 647	case DN_CD:
 648		scp->persist_fxn = dn_destroy_timer;
 649		scp->persist = dn_nsp_persist(sk);
 650		break;
 651	default:
 652		printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 
 653	case DN_O:
 654		dn_stop_slow_timer(sk);
 655
 656		dn_unhash_sock_bh(sk);
 657		sock_put(sk);
 658
 659		break;
 660	}
 661}
 662
 663char *dn_addr2asc(__u16 addr, char *buf)
 664{
 665	unsigned short node, area;
 666
 667	node = addr & 0x03ff;
 668	area = addr >> 10;
 669	sprintf(buf, "%hd.%hd", area, node);
 670
 671	return buf;
 672}
 673
 674
 675
 676static int dn_create(struct net *net, struct socket *sock, int protocol,
 677		     int kern)
 678{
 679	struct sock *sk;
 680
 681	if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
 682		return -EINVAL;
 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, kern)) == 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	struct dst_entry *dst;
 914
 915	if (sock->state == SS_CONNECTED)
 916		goto out;
 917
 918	if (sock->state == SS_CONNECTING) {
 919		err = 0;
 920		if (scp->state == DN_RUN) {
 921			sock->state = SS_CONNECTED;
 922			goto out;
 923		}
 924		err = -ECONNREFUSED;
 925		if (scp->state != DN_CI && scp->state != DN_CC) {
 926			sock->state = SS_UNCONNECTED;
 927			goto out;
 928		}
 929		return dn_wait_run(sk, timeo);
 930	}
 931
 932	err = -EINVAL;
 933	if (scp->state != DN_O)
 934		goto out;
 935
 936	if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 937		goto out;
 938	if (addr->sdn_family != AF_DECnet)
 939		goto out;
 940	if (addr->sdn_flags & SDF_WILD)
 941		goto out;
 942
 943	if (sock_flag(sk, SOCK_ZAPPED)) {
 944		err = dn_auto_bind(sk->sk_socket);
 945		if (err)
 946			goto out;
 947	}
 948
 949	memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 950
 951	err = -EHOSTUNREACH;
 952	memset(&fld, 0, sizeof(fld));
 953	fld.flowidn_oif = sk->sk_bound_dev_if;
 954	fld.daddr = dn_saddr2dn(&scp->peer);
 955	fld.saddr = dn_saddr2dn(&scp->addr);
 956	dn_sk_ports_copy(&fld, scp);
 957	fld.flowidn_proto = DNPROTO_NSP;
 958	if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
 959		goto out;
 960	dst = __sk_dst_get(sk);
 961	sk->sk_route_caps = dst->dev->features;
 962	sock->state = SS_CONNECTING;
 963	scp->state = DN_CI;
 964	scp->segsize_loc = dst_metric_advmss(dst);
 965
 966	dn_nsp_send_conninit(sk, NSP_CI);
 967	err = -EINPROGRESS;
 968	if (*timeo) {
 969		err = dn_wait_run(sk, timeo);
 970	}
 971out:
 972	return err;
 973}
 974
 975static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 976{
 977	struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 978	struct sock *sk = sock->sk;
 979	int err;
 980	long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 981
 982	lock_sock(sk);
 983	err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 984	release_sock(sk);
 985
 986	return err;
 987}
 988
 989static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 990{
 991	struct dn_scp *scp = DN_SK(sk);
 992
 993	switch (scp->state) {
 994	case DN_RUN:
 995		return 0;
 996	case DN_CR:
 997		return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 998	case DN_CI:
 999	case DN_CC:
1000		return dn_wait_run(sk, timeo);
1001	case DN_O:
1002		return __dn_connect(sk, addr, addrlen, timeo, flags);
1003	}
1004
1005	return -EINVAL;
1006}
1007
1008
1009static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1010{
1011	unsigned char *ptr = skb->data;
1012
1013	acc->acc_userl = *ptr++;
1014	memcpy(&acc->acc_user, ptr, acc->acc_userl);
1015	ptr += acc->acc_userl;
1016
1017	acc->acc_passl = *ptr++;
1018	memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1019	ptr += acc->acc_passl;
1020
1021	acc->acc_accl = *ptr++;
1022	memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1023
1024	skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1025
1026}
1027
1028static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1029{
1030	unsigned char *ptr = skb->data;
1031	u16 len = *ptr++; /* yes, it's 8bit on the wire */
1032
1033	BUG_ON(len > 16); /* we've checked the contents earlier */
1034	opt->opt_optl   = cpu_to_le16(len);
1035	opt->opt_status = 0;
1036	memcpy(opt->opt_data, ptr, len);
1037	skb_pull(skb, len + 1);
1038}
1039
1040static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1041{
1042	DEFINE_WAIT(wait);
1043	struct sk_buff *skb = NULL;
1044	int err = 0;
1045
1046	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1047	for(;;) {
1048		release_sock(sk);
1049		skb = skb_dequeue(&sk->sk_receive_queue);
1050		if (skb == NULL) {
1051			*timeo = schedule_timeout(*timeo);
1052			skb = skb_dequeue(&sk->sk_receive_queue);
1053		}
1054		lock_sock(sk);
1055		if (skb != NULL)
1056			break;
1057		err = -EINVAL;
1058		if (sk->sk_state != TCP_LISTEN)
1059			break;
1060		err = sock_intr_errno(*timeo);
1061		if (signal_pending(current))
1062			break;
1063		err = -EAGAIN;
1064		if (!*timeo)
1065			break;
1066		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1067	}
1068	finish_wait(sk_sleep(sk), &wait);
1069
1070	return skb == NULL ? ERR_PTR(err) : skb;
1071}
1072
1073static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
 
1074{
1075	struct sock *sk = sock->sk, *newsk;
1076	struct sk_buff *skb = NULL;
1077	struct dn_skb_cb *cb;
1078	unsigned char menuver;
1079	int err = 0;
1080	unsigned char type;
1081	long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1082	struct dst_entry *dst;
1083
1084	lock_sock(sk);
1085
1086	if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1087		release_sock(sk);
1088		return -EINVAL;
1089	}
1090
1091	skb = skb_dequeue(&sk->sk_receive_queue);
1092	if (skb == NULL) {
1093		skb = dn_wait_for_connect(sk, &timeo);
1094		if (IS_ERR(skb)) {
1095			release_sock(sk);
1096			return PTR_ERR(skb);
1097		}
1098	}
1099
1100	cb = DN_SKB_CB(skb);
1101	sk->sk_ack_backlog--;
1102	newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, 0);
1103	if (newsk == NULL) {
1104		release_sock(sk);
1105		kfree_skb(skb);
1106		return -ENOBUFS;
1107	}
1108	release_sock(sk);
1109
1110	dst = skb_dst(skb);
1111	sk_dst_set(newsk, dst);
1112	skb_dst_set(skb, NULL);
1113
1114	DN_SK(newsk)->state        = DN_CR;
1115	DN_SK(newsk)->addrrem      = cb->src_port;
1116	DN_SK(newsk)->services_rem = cb->services;
1117	DN_SK(newsk)->info_rem     = cb->info;
1118	DN_SK(newsk)->segsize_rem  = cb->segsize;
1119	DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1120
1121	if (DN_SK(newsk)->segsize_rem < 230)
1122		DN_SK(newsk)->segsize_rem = 230;
1123
1124	if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1125		DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1126
1127	newsk->sk_state  = TCP_LISTEN;
1128	memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1129
1130	/*
1131	 * If we are listening on a wild socket, we don't want
1132	 * the newly created socket on the wrong hash queue.
1133	 */
1134	DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1135
1136	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1137	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1138	*(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1139	*(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1140
1141	menuver = *skb->data;
1142	skb_pull(skb, 1);
1143
1144	if (menuver & DN_MENUVER_ACC)
1145		dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1146
1147	if (menuver & DN_MENUVER_USR)
1148		dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1149
1150	if (menuver & DN_MENUVER_PRX)
1151		DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1152
1153	if (menuver & DN_MENUVER_UIC)
1154		DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1155
1156	kfree_skb(skb);
1157
1158	memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1159		sizeof(struct optdata_dn));
1160	memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1161		sizeof(struct optdata_dn));
1162
1163	lock_sock(newsk);
1164	err = dn_hash_sock(newsk);
1165	if (err == 0) {
1166		sock_reset_flag(newsk, SOCK_ZAPPED);
1167		dn_send_conn_ack(newsk);
1168
1169		/*
1170		 * Here we use sk->sk_allocation since although the conn conf is
1171		 * for the newsk, the context is the old socket.
1172		 */
1173		if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1174			err = dn_confirm_accept(newsk, &timeo,
1175						sk->sk_allocation);
1176	}
1177	release_sock(newsk);
1178	return err;
1179}
1180
1181
1182static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1183{
1184	struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1185	struct sock *sk = sock->sk;
1186	struct dn_scp *scp = DN_SK(sk);
1187
1188	*uaddr_len = sizeof(struct sockaddr_dn);
1189
1190	lock_sock(sk);
1191
1192	if (peer) {
1193		if ((sock->state != SS_CONNECTED &&
1194		     sock->state != SS_CONNECTING) &&
1195		    scp->accept_mode == ACC_IMMED) {
1196			release_sock(sk);
1197			return -ENOTCONN;
1198		}
1199
1200		memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1201	} else {
1202		memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1203	}
1204
1205	release_sock(sk);
1206
1207	return 0;
1208}
1209
1210
1211static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1212{
1213	struct sock *sk = sock->sk;
1214	struct dn_scp *scp = DN_SK(sk);
1215	int mask = datagram_poll(file, sock, wait);
1216
1217	if (!skb_queue_empty(&scp->other_receive_queue))
1218		mask |= POLLRDBAND;
1219
1220	return mask;
1221}
1222
1223static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1224{
1225	struct sock *sk = sock->sk;
1226	struct dn_scp *scp = DN_SK(sk);
1227	int err = -EOPNOTSUPP;
1228	long amount = 0;
1229	struct sk_buff *skb;
1230	int val;
1231
1232	switch(cmd)
1233	{
1234	case SIOCGIFADDR:
1235	case SIOCSIFADDR:
1236		return dn_dev_ioctl(cmd, (void __user *)arg);
1237
1238	case SIOCATMARK:
1239		lock_sock(sk);
1240		val = !skb_queue_empty(&scp->other_receive_queue);
1241		if (scp->state != DN_RUN)
1242			val = -ENOTCONN;
1243		release_sock(sk);
1244		return val;
1245
1246	case TIOCOUTQ:
1247		amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1248		if (amount < 0)
1249			amount = 0;
1250		err = put_user(amount, (int __user *)arg);
1251		break;
1252
1253	case TIOCINQ:
1254		lock_sock(sk);
1255		skb = skb_peek(&scp->other_receive_queue);
1256		if (skb) {
1257			amount = skb->len;
1258		} else {
1259			skb_queue_walk(&sk->sk_receive_queue, skb)
1260				amount += skb->len;
1261		}
1262		release_sock(sk);
1263		err = put_user(amount, (int __user *)arg);
1264		break;
1265
1266	default:
1267		err = -ENOIOCTLCMD;
1268		break;
1269	}
1270
1271	return err;
1272}
1273
1274static int dn_listen(struct socket *sock, int backlog)
1275{
1276	struct sock *sk = sock->sk;
1277	int err = -EINVAL;
1278
1279	lock_sock(sk);
1280
1281	if (sock_flag(sk, SOCK_ZAPPED))
1282		goto out;
1283
1284	if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1285		goto out;
1286
1287	sk->sk_max_ack_backlog = backlog;
1288	sk->sk_ack_backlog     = 0;
1289	sk->sk_state           = TCP_LISTEN;
1290	err                 = 0;
1291	dn_rehash_sock(sk);
1292
1293out:
1294	release_sock(sk);
1295
1296	return err;
1297}
1298
1299
1300static int dn_shutdown(struct socket *sock, int how)
1301{
1302	struct sock *sk = sock->sk;
1303	struct dn_scp *scp = DN_SK(sk);
1304	int err = -ENOTCONN;
1305
1306	lock_sock(sk);
1307
1308	if (sock->state == SS_UNCONNECTED)
1309		goto out;
1310
1311	err = 0;
1312	if (sock->state == SS_DISCONNECTING)
1313		goto out;
1314
1315	err = -EINVAL;
1316	if (scp->state == DN_O)
1317		goto out;
1318
1319	if (how != SHUT_RDWR)
1320		goto out;
1321
1322	sk->sk_shutdown = SHUTDOWN_MASK;
1323	dn_destroy_sock(sk);
1324	err = 0;
1325
1326out:
1327	release_sock(sk);
1328
1329	return err;
1330}
1331
1332static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1333{
1334	struct sock *sk = sock->sk;
1335	int err;
1336
1337	lock_sock(sk);
1338	err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1339	release_sock(sk);
 
 
 
 
 
 
1340
1341	return err;
1342}
1343
1344static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1345{
1346	struct	sock *sk = sock->sk;
1347	struct dn_scp *scp = DN_SK(sk);
1348	long timeo;
1349	union {
1350		struct optdata_dn opt;
1351		struct accessdata_dn acc;
1352		int mode;
1353		unsigned long win;
1354		int val;
1355		unsigned char services;
1356		unsigned char info;
1357	} u;
1358	int err;
1359
1360	if (optlen && !optval)
1361		return -EINVAL;
1362
1363	if (optlen > sizeof(u))
1364		return -EINVAL;
1365
1366	if (copy_from_user(&u, optval, optlen))
1367		return -EFAULT;
1368
1369	switch (optname) {
1370	case DSO_CONDATA:
1371		if (sock->state == SS_CONNECTED)
1372			return -EISCONN;
1373		if ((scp->state != DN_O) && (scp->state != DN_CR))
1374			return -EINVAL;
1375
1376		if (optlen != sizeof(struct optdata_dn))
1377			return -EINVAL;
1378
1379		if (le16_to_cpu(u.opt.opt_optl) > 16)
1380			return -EINVAL;
1381
1382		memcpy(&scp->conndata_out, &u.opt, optlen);
1383		break;
1384
1385	case DSO_DISDATA:
1386		if (sock->state != SS_CONNECTED &&
1387		    scp->accept_mode == ACC_IMMED)
1388			return -ENOTCONN;
1389
1390		if (optlen != sizeof(struct optdata_dn))
1391			return -EINVAL;
1392
1393		if (le16_to_cpu(u.opt.opt_optl) > 16)
1394			return -EINVAL;
1395
1396		memcpy(&scp->discdata_out, &u.opt, optlen);
1397		break;
1398
1399	case DSO_CONACCESS:
1400		if (sock->state == SS_CONNECTED)
1401			return -EISCONN;
1402		if (scp->state != DN_O)
1403			return -EINVAL;
1404
1405		if (optlen != sizeof(struct accessdata_dn))
1406			return -EINVAL;
1407
1408		if ((u.acc.acc_accl > DN_MAXACCL) ||
1409		    (u.acc.acc_passl > DN_MAXACCL) ||
1410		    (u.acc.acc_userl > DN_MAXACCL))
1411			return -EINVAL;
1412
1413		memcpy(&scp->accessdata, &u.acc, optlen);
1414		break;
1415
1416	case DSO_ACCEPTMODE:
1417		if (sock->state == SS_CONNECTED)
1418			return -EISCONN;
1419		if (scp->state != DN_O)
1420			return -EINVAL;
1421
1422		if (optlen != sizeof(int))
1423			return -EINVAL;
1424
1425		if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1426			return -EINVAL;
1427
1428		scp->accept_mode = (unsigned char)u.mode;
1429		break;
1430
1431	case DSO_CONACCEPT:
1432		if (scp->state != DN_CR)
1433			return -EINVAL;
1434		timeo = sock_rcvtimeo(sk, 0);
1435		err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1436		return err;
1437
1438	case DSO_CONREJECT:
1439		if (scp->state != DN_CR)
1440			return -EINVAL;
1441
1442		scp->state = DN_DR;
1443		sk->sk_shutdown = SHUTDOWN_MASK;
1444		dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1445		break;
1446
1447	default:
1448#ifdef CONFIG_NETFILTER
1449		return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1450#endif
1451	case DSO_LINKINFO:
1452	case DSO_STREAM:
1453	case DSO_SEQPACKET:
1454		return -ENOPROTOOPT;
1455
1456	case DSO_MAXWINDOW:
1457		if (optlen != sizeof(unsigned long))
1458			return -EINVAL;
1459		if (u.win > NSP_MAX_WINDOW)
1460			u.win = NSP_MAX_WINDOW;
1461		if (u.win == 0)
1462			return -EINVAL;
1463		scp->max_window = u.win;
1464		if (scp->snd_window > u.win)
1465			scp->snd_window = u.win;
1466		break;
1467
1468	case DSO_NODELAY:
1469		if (optlen != sizeof(int))
1470			return -EINVAL;
1471		if (scp->nonagle == 2)
1472			return -EINVAL;
1473		scp->nonagle = (u.val == 0) ? 0 : 1;
1474		/* if (scp->nonagle == 1) { Push pending frames } */
1475		break;
1476
1477	case DSO_CORK:
1478		if (optlen != sizeof(int))
1479			return -EINVAL;
1480		if (scp->nonagle == 1)
1481			return -EINVAL;
1482		scp->nonagle = (u.val == 0) ? 0 : 2;
1483		/* if (scp->nonagle == 0) { Push pending frames } */
1484		break;
1485
1486	case DSO_SERVICES:
1487		if (optlen != sizeof(unsigned char))
1488			return -EINVAL;
1489		if ((u.services & ~NSP_FC_MASK) != 0x01)
1490			return -EINVAL;
1491		if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1492			return -EINVAL;
1493		scp->services_loc = u.services;
1494		break;
1495
1496	case DSO_INFO:
1497		if (optlen != sizeof(unsigned char))
1498			return -EINVAL;
1499		if (u.info & 0xfc)
1500			return -EINVAL;
1501		scp->info_loc = u.info;
1502		break;
 
 
 
 
 
 
1503	}
1504
1505	return 0;
1506}
1507
1508static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1509{
1510	struct sock *sk = sock->sk;
1511	int err;
1512
1513	lock_sock(sk);
1514	err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1515	release_sock(sk);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1516
1517	return err;
1518}
1519
1520static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1521{
1522	struct	sock *sk = sock->sk;
1523	struct dn_scp *scp = DN_SK(sk);
1524	struct linkinfo_dn link;
1525	unsigned int r_len;
1526	void *r_data = NULL;
1527	unsigned int val;
1528
1529	if(get_user(r_len , optlen))
1530		return -EFAULT;
1531
1532	switch (optname) {
1533	case DSO_CONDATA:
1534		if (r_len > sizeof(struct optdata_dn))
1535			r_len = sizeof(struct optdata_dn);
1536		r_data = &scp->conndata_in;
1537		break;
1538
1539	case DSO_DISDATA:
1540		if (r_len > sizeof(struct optdata_dn))
1541			r_len = sizeof(struct optdata_dn);
1542		r_data = &scp->discdata_in;
1543		break;
1544
1545	case DSO_CONACCESS:
1546		if (r_len > sizeof(struct accessdata_dn))
1547			r_len = sizeof(struct accessdata_dn);
1548		r_data = &scp->accessdata;
1549		break;
1550
1551	case DSO_ACCEPTMODE:
1552		if (r_len > sizeof(unsigned char))
1553			r_len = sizeof(unsigned char);
1554		r_data = &scp->accept_mode;
1555		break;
1556
1557	case DSO_LINKINFO:
1558		if (r_len > sizeof(struct linkinfo_dn))
1559			r_len = sizeof(struct linkinfo_dn);
1560
1561		memset(&link, 0, sizeof(link));
1562
1563		switch (sock->state) {
1564		case SS_CONNECTING:
1565			link.idn_linkstate = LL_CONNECTING;
1566			break;
1567		case SS_DISCONNECTING:
1568			link.idn_linkstate = LL_DISCONNECTING;
1569			break;
1570		case SS_CONNECTED:
1571			link.idn_linkstate = LL_RUNNING;
1572			break;
1573		default:
1574			link.idn_linkstate = LL_INACTIVE;
1575		}
1576
1577		link.idn_segsize = scp->segsize_rem;
1578		r_data = &link;
1579		break;
1580
1581	default:
1582#ifdef CONFIG_NETFILTER
1583	{
1584		int ret, len;
1585
1586		if (get_user(len, optlen))
1587			return -EFAULT;
1588
1589		ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1590		if (ret >= 0)
1591			ret = put_user(len, optlen);
1592		return ret;
1593	}
1594#endif
1595	case DSO_STREAM:
1596	case DSO_SEQPACKET:
1597	case DSO_CONACCEPT:
1598	case DSO_CONREJECT:
1599		return -ENOPROTOOPT;
1600
1601	case DSO_MAXWINDOW:
1602		if (r_len > sizeof(unsigned long))
1603			r_len = sizeof(unsigned long);
1604		r_data = &scp->max_window;
1605		break;
1606
1607	case DSO_NODELAY:
1608		if (r_len > sizeof(int))
1609			r_len = sizeof(int);
1610		val = (scp->nonagle == 1);
1611		r_data = &val;
1612		break;
1613
1614	case DSO_CORK:
1615		if (r_len > sizeof(int))
1616			r_len = sizeof(int);
1617		val = (scp->nonagle == 2);
1618		r_data = &val;
1619		break;
1620
1621	case DSO_SERVICES:
1622		if (r_len > sizeof(unsigned char))
1623			r_len = sizeof(unsigned char);
1624		r_data = &scp->services_rem;
1625		break;
1626
1627	case DSO_INFO:
1628		if (r_len > sizeof(unsigned char))
1629			r_len = sizeof(unsigned char);
1630		r_data = &scp->info_rem;
1631		break;
 
 
 
 
 
 
 
1632	}
1633
1634	if (r_data) {
1635		if (copy_to_user(optval, r_data, r_len))
1636			return -EFAULT;
1637		if (put_user(r_len, optlen))
1638			return -EFAULT;
1639	}
1640
1641	return 0;
1642}
1643
1644
1645static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1646{
1647	struct sk_buff *skb;
1648	int len = 0;
1649
1650	if (flags & MSG_OOB)
1651		return !skb_queue_empty(q) ? 1 : 0;
1652
1653	skb_queue_walk(q, skb) {
1654		struct dn_skb_cb *cb = DN_SKB_CB(skb);
1655		len += skb->len;
1656
1657		if (cb->nsp_flags & 0x40) {
1658			/* SOCK_SEQPACKET reads to EOM */
1659			if (sk->sk_type == SOCK_SEQPACKET)
1660				return 1;
1661			/* so does SOCK_STREAM unless WAITALL is specified */
1662			if (!(flags & MSG_WAITALL))
1663				return 1;
1664		}
1665
1666		/* minimum data length for read exceeded */
1667		if (len >= target)
1668			return 1;
1669	}
1670
1671	return 0;
1672}
1673
1674
1675static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1676		      int flags)
1677{
1678	struct sock *sk = sock->sk;
1679	struct dn_scp *scp = DN_SK(sk);
1680	struct sk_buff_head *queue = &sk->sk_receive_queue;
1681	size_t target = size > 1 ? 1 : 0;
1682	size_t copied = 0;
1683	int rv = 0;
1684	struct sk_buff *skb, *n;
1685	struct dn_skb_cb *cb = NULL;
1686	unsigned char eor = 0;
1687	long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1688
1689	lock_sock(sk);
1690
1691	if (sock_flag(sk, SOCK_ZAPPED)) {
1692		rv = -EADDRNOTAVAIL;
1693		goto out;
1694	}
1695
1696	if (sk->sk_shutdown & RCV_SHUTDOWN) {
1697		rv = 0;
1698		goto out;
1699	}
1700
1701	rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1702	if (rv)
1703		goto out;
1704
1705	if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1706		rv = -EOPNOTSUPP;
1707		goto out;
1708	}
1709
1710	if (flags & MSG_OOB)
1711		queue = &scp->other_receive_queue;
1712
1713	if (flags & MSG_WAITALL)
1714		target = size;
1715
1716
1717	/*
1718	 * See if there is data ready to read, sleep if there isn't
1719	 */
1720	for(;;) {
1721		DEFINE_WAIT(wait);
1722
1723		if (sk->sk_err)
1724			goto out;
1725
1726		if (!skb_queue_empty(&scp->other_receive_queue)) {
1727			if (!(flags & MSG_OOB)) {
1728				msg->msg_flags |= MSG_OOB;
1729				if (!scp->other_report) {
1730					scp->other_report = 1;
1731					goto out;
1732				}
1733			}
1734		}
1735
1736		if (scp->state != DN_RUN)
1737			goto out;
1738
1739		if (signal_pending(current)) {
1740			rv = sock_intr_errno(timeo);
1741			goto out;
1742		}
1743
1744		if (dn_data_ready(sk, queue, flags, target))
1745			break;
1746
1747		if (flags & MSG_DONTWAIT) {
1748			rv = -EWOULDBLOCK;
1749			goto out;
1750		}
1751
1752		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1753		sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1754		sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1755		sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1756		finish_wait(sk_sleep(sk), &wait);
1757	}
1758
1759	skb_queue_walk_safe(queue, skb, n) {
1760		unsigned int chunk = skb->len;
1761		cb = DN_SKB_CB(skb);
1762
1763		if ((chunk + copied) > size)
1764			chunk = size - copied;
1765
1766		if (memcpy_to_msg(msg, skb->data, chunk)) {
1767			rv = -EFAULT;
1768			break;
1769		}
1770		copied += chunk;
1771
1772		if (!(flags & MSG_PEEK))
1773			skb_pull(skb, chunk);
1774
1775		eor = cb->nsp_flags & 0x40;
1776
1777		if (skb->len == 0) {
1778			skb_unlink(skb, queue);
1779			kfree_skb(skb);
1780			/*
1781			 * N.B. Don't refer to skb or cb after this point
1782			 * in loop.
1783			 */
1784			if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1785				scp->flowloc_sw = DN_SEND;
1786				dn_nsp_send_link(sk, DN_SEND, 0);
1787			}
1788		}
1789
1790		if (eor) {
1791			if (sk->sk_type == SOCK_SEQPACKET)
1792				break;
1793			if (!(flags & MSG_WAITALL))
1794				break;
1795		}
1796
1797		if (flags & MSG_OOB)
1798			break;
1799
1800		if (copied >= target)
1801			break;
1802	}
1803
1804	rv = copied;
1805
1806
1807	if (eor && (sk->sk_type == SOCK_SEQPACKET))
1808		msg->msg_flags |= MSG_EOR;
1809
1810out:
1811	if (rv == 0)
1812		rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1813
1814	if ((rv >= 0) && msg->msg_name) {
1815		__sockaddr_check_size(sizeof(struct sockaddr_dn));
1816		memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1817		msg->msg_namelen = sizeof(struct sockaddr_dn);
1818	}
1819
1820	release_sock(sk);
1821
1822	return rv;
1823}
1824
1825
1826static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1827{
1828	unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1829	if (skb_queue_len(queue) >= scp->snd_window)
1830		return 1;
1831	if (fctype != NSP_FC_NONE) {
1832		if (flags & MSG_OOB) {
1833			if (scp->flowrem_oth == 0)
1834				return 1;
1835		} else {
1836			if (scp->flowrem_dat == 0)
1837				return 1;
1838		}
1839	}
1840	return 0;
1841}
1842
1843/*
1844 * The DECnet spec requires that the "routing layer" accepts packets which
1845 * are at least 230 bytes in size. This excludes any headers which the NSP
1846 * layer might add, so we always assume that we'll be using the maximal
1847 * length header on data packets. The variation in length is due to the
1848 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1849 * make much practical difference.
1850 */
1851unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1852{
1853	unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1854	if (dev) {
1855		struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1856		mtu -= LL_RESERVED_SPACE(dev);
1857		if (dn_db->use_long)
1858			mtu -= 21;
1859		else
1860			mtu -= 6;
1861		mtu -= DN_MAX_NSP_DATA_HEADER;
1862	} else {
1863		/*
1864		 * 21 = long header, 16 = guess at MAC header length
1865		 */
1866		mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1867	}
1868	if (mtu > mss)
1869		mss = mtu;
1870	return mss;
1871}
1872
1873static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1874{
1875	struct dst_entry *dst = __sk_dst_get(sk);
1876	struct dn_scp *scp = DN_SK(sk);
1877	int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1878
1879	/* Other data messages are limited to 16 bytes per packet */
1880	if (flags & MSG_OOB)
1881		return 16;
1882
1883	/* This works out the maximum size of segment we can send out */
1884	if (dst) {
1885		u32 mtu = dst_mtu(dst);
1886		mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1887	}
1888
1889	return mss_now;
1890}
1891
1892/*
1893 * N.B. We get the timeout wrong here, but then we always did get it
1894 * wrong before and this is another step along the road to correcting
1895 * it. It ought to get updated each time we pass through the routine,
1896 * but in practise it probably doesn't matter too much for now.
1897 */
1898static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1899			      unsigned long datalen, int noblock,
1900			      int *errcode)
1901{
1902	struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1903						   noblock, errcode);
1904	if (skb) {
1905		skb->protocol = htons(ETH_P_DNA_RT);
1906		skb->pkt_type = PACKET_OUTGOING;
1907	}
1908	return skb;
1909}
1910
1911static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1912{
1913	struct sock *sk = sock->sk;
1914	struct dn_scp *scp = DN_SK(sk);
1915	size_t mss;
1916	struct sk_buff_head *queue = &scp->data_xmit_queue;
1917	int flags = msg->msg_flags;
1918	int err = 0;
1919	size_t sent = 0;
1920	int addr_len = msg->msg_namelen;
1921	DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1922	struct sk_buff *skb = NULL;
1923	struct dn_skb_cb *cb;
1924	size_t len;
1925	unsigned char fctype;
1926	long timeo;
1927
1928	if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1929		return -EOPNOTSUPP;
1930
1931	if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1932		return -EINVAL;
1933
1934	lock_sock(sk);
1935	timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1936	/*
1937	 * The only difference between stream sockets and sequenced packet
1938	 * sockets is that the stream sockets always behave as if MSG_EOR
1939	 * has been set.
1940	 */
1941	if (sock->type == SOCK_STREAM) {
1942		if (flags & MSG_EOR) {
1943			err = -EINVAL;
1944			goto out;
1945		}
1946		flags |= MSG_EOR;
1947	}
1948
1949
1950	err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1951	if (err)
1952		goto out_err;
1953
1954	if (sk->sk_shutdown & SEND_SHUTDOWN) {
1955		err = -EPIPE;
1956		if (!(flags & MSG_NOSIGNAL))
1957			send_sig(SIGPIPE, current, 0);
1958		goto out_err;
1959	}
1960
1961	if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1962		dst_negative_advice(sk);
1963
1964	mss = scp->segsize_rem;
1965	fctype = scp->services_rem & NSP_FC_MASK;
1966
1967	mss = dn_current_mss(sk, flags);
1968
1969	if (flags & MSG_OOB) {
1970		queue = &scp->other_xmit_queue;
1971		if (size > mss) {
1972			err = -EMSGSIZE;
1973			goto out;
1974		}
1975	}
1976
1977	scp->persist_fxn = dn_nsp_xmit_timeout;
1978
1979	while(sent < size) {
1980		err = sock_error(sk);
1981		if (err)
1982			goto out;
1983
1984		if (signal_pending(current)) {
1985			err = sock_intr_errno(timeo);
1986			goto out;
1987		}
1988
1989		/*
1990		 * Calculate size that we wish to send.
1991		 */
1992		len = size - sent;
1993
1994		if (len > mss)
1995			len = mss;
1996
1997		/*
1998		 * Wait for queue size to go down below the window
1999		 * size.
2000		 */
2001		if (dn_queue_too_long(scp, queue, flags)) {
2002			DEFINE_WAIT(wait);
2003
2004			if (flags & MSG_DONTWAIT) {
2005				err = -EWOULDBLOCK;
2006				goto out;
2007			}
2008
2009			prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2010			sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2011			sk_wait_event(sk, &timeo,
2012				      !dn_queue_too_long(scp, queue, flags));
2013			sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2014			finish_wait(sk_sleep(sk), &wait);
2015			continue;
2016		}
2017
2018		/*
2019		 * Get a suitably sized skb.
2020		 * 64 is a bit of a hack really, but its larger than any
2021		 * link-layer headers and has served us well as a good
2022		 * guess as to their real length.
2023		 */
2024		skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2025					 flags & MSG_DONTWAIT, &err);
2026
2027		if (err)
2028			break;
2029
2030		if (!skb)
2031			continue;
2032
2033		cb = DN_SKB_CB(skb);
2034
2035		skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2036
2037		if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2038			err = -EFAULT;
2039			goto out;
2040		}
2041
2042		if (flags & MSG_OOB) {
2043			cb->nsp_flags = 0x30;
2044			if (fctype != NSP_FC_NONE)
2045				scp->flowrem_oth--;
2046		} else {
2047			cb->nsp_flags = 0x00;
2048			if (scp->seg_total == 0)
2049				cb->nsp_flags |= 0x20;
2050
2051			scp->seg_total += len;
2052
2053			if (((sent + len) == size) && (flags & MSG_EOR)) {
2054				cb->nsp_flags |= 0x40;
2055				scp->seg_total = 0;
2056				if (fctype == NSP_FC_SCMC)
2057					scp->flowrem_dat--;
2058			}
2059			if (fctype == NSP_FC_SRC)
2060				scp->flowrem_dat--;
2061		}
2062
2063		sent += len;
2064		dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2065		skb = NULL;
2066
2067		scp->persist = dn_nsp_persist(sk);
2068
2069	}
2070out:
2071
2072	kfree_skb(skb);
2073
2074	release_sock(sk);
2075
2076	return sent ? sent : err;
2077
2078out_err:
2079	err = sk_stream_error(sk, flags, err);
2080	release_sock(sk);
2081	return err;
2082}
2083
2084static int dn_device_event(struct notifier_block *this, unsigned long event,
2085			   void *ptr)
2086{
2087	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2088
2089	if (!net_eq(dev_net(dev), &init_net))
2090		return NOTIFY_DONE;
2091
2092	switch (event) {
2093	case NETDEV_UP:
2094		dn_dev_up(dev);
2095		break;
2096	case NETDEV_DOWN:
2097		dn_dev_down(dev);
2098		break;
2099	default:
2100		break;
2101	}
2102
2103	return NOTIFY_DONE;
2104}
2105
2106static struct notifier_block dn_dev_notifier = {
2107	.notifier_call = dn_device_event,
2108};
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
2357MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2358MODULE_AUTHOR("Linux DECnet Project Team");
2359MODULE_LICENSE("GPL");
2360MODULE_ALIAS_NETPROTO(PF_DECnet);
2361
2362static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
 
2363
2364static int __init decnet_init(void)
2365{
2366	int rc;
2367
2368	printk(banner);
2369
2370	rc = proto_register(&dn_proto, 1);
2371	if (rc != 0)
2372		goto out;
2373
2374	dn_neigh_init();
2375	dn_dev_init();
2376	dn_route_init();
2377	dn_fib_init();
2378
2379	sock_register(&dn_family_ops);
2380	dev_add_pack(&dn_dix_packet_type);
2381	register_netdevice_notifier(&dn_dev_notifier);
2382
2383	proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
2384	dn_register_sysctl();
2385out:
2386	return rc;
2387
2388}
2389module_init(decnet_init);
2390
2391/*
2392 * Prevent DECnet module unloading until its fixed properly.
2393 * Requires an audit of the code to check for memory leaks and
2394 * initialisation problems etc.
2395 */
2396#if 0
2397static void __exit decnet_exit(void)
2398{
2399	sock_unregister(AF_DECnet);
2400	rtnl_unregister_all(PF_DECnet);
2401	dev_remove_pack(&dn_dix_packet_type);
2402
2403	dn_unregister_sysctl();
2404
2405	unregister_netdevice_notifier(&dn_dev_notifier);
2406
2407	dn_route_cleanup();
2408	dn_dev_cleanup();
2409	dn_neigh_cleanup();
2410	dn_fib_cleanup();
2411
2412	remove_proc_entry("decnet", init_net.proc_net);
2413
2414	proto_unregister(&dn_proto);
2415
2416	rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2417}
2418module_exit(decnet_exit);
2419#endif