1// SPDX-License-Identifier: GPL-2.0-or-later
   2
   3/*
   4 * DECnet       An implementation of the DECnet protocol suite for the LINUX
   5 *              operating system.  DECnet is implemented using the  BSD Socket
   6 *              interface as the means of communication with the user level.
   7 *
   8 *              DECnet Socket Layer Interface
   9 *
  10 * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
  11 *              Patrick Caulfield <patrick@pandh.demon.co.uk>
  12 *
  13 * Changes:
  14 *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
  15 *                          version of the code. Original copyright preserved
  16 *                          below.
  17 *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
  18 *                          compatible with my routing layer.
  19 *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
  20 *                          Caulfield.
  21 *        Steve Whitehouse: Further bug fixes, checking module code still works
  22 *                          with new routing layer.
  23 *        Steve Whitehouse: Additional set/get_sockopt() calls.
  24 *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
  25 *                          code.
  26 *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
  27 *                          way. Didn't manage it entirely, but its better.
  28 *        Steve Whitehouse: ditto for sendmsg().
  29 *        Steve Whitehouse: A selection of bug fixes to various things.
  30 *        Steve Whitehouse: Added TIOCOUTQ ioctl.
  31 *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
  32 *        Steve Whitehouse: Fixes to connect() error returns.
  33 *       Patrick Caulfield: Fixes to delayed acceptance logic.
  34 *         David S. Miller: New socket locking
  35 *        Steve Whitehouse: Socket list hashing/locking
  36 *         Arnaldo C. Melo: use capable, not suser
  37 *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
  38 *                          when required.
  39 *       Patrick Caulfield: /proc/net/decnet now has object name/number
  40 *        Steve Whitehouse: Fixed local port allocation, hashed sk list
  41 *          Matthew Wilcox: Fixes for dn_ioctl()
  42 *        Steve Whitehouse: New connect/accept logic to allow timeouts and
  43 *                          prepare for sendpage etc.
  44 */
  45
  46
  47/******************************************************************************
  48    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
  49
 
 
 
 
 
 
 
 
 
  50
  51HISTORY:
  52
  53Version           Kernel     Date       Author/Comments
  54-------           ------     ----       ---------------
  55Version 0.0.1     2.0.30    01-dic-97	Eduardo Marcelo Serrat
  56					(emserrat@geocities.com)
  57
  58					First Development of DECnet Socket La-
  59					yer for Linux. Only supports outgoing
  60					connections.
  61
  62Version 0.0.2	  2.1.105   20-jun-98   Patrick J. Caulfield
  63					(patrick@pandh.demon.co.uk)
  64
  65					Port to new kernel development version.
  66
  67Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
  68					(emserrat@geocities.com)
  69					_
  70					Added support for incoming connections
  71					so we can start developing server apps
  72					on Linux.
  73					-
  74					Module Support
  75Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
  76				       (emserrat@geocities.com)
  77				       _
  78					Added support for X11R6.4. Now we can
  79					use DECnet transport for X on Linux!!!
  80				       -
  81Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
  82				       (emserrat@geocities.com)
  83				       Removed bugs on flow control
  84				       Removed bugs on incoming accessdata
  85				       order
  86				       -
  87Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
  88				       dn_recvmsg fixes
  89
  90					Patrick J. Caulfield
  91				       dn_bind fixes
  92*******************************************************************************/
  93
  94#include <linux/module.h>
  95#include <linux/errno.h>
  96#include <linux/types.h>
  97#include <linux/slab.h>
  98#include <linux/socket.h>
  99#include <linux/in.h>
 100#include <linux/kernel.h>
 101#include <linux/sched/signal.h>
 102#include <linux/timer.h>
 103#include <linux/string.h>
 104#include <linux/sockios.h>
 105#include <linux/net.h>
 106#include <linux/netdevice.h>
 107#include <linux/inet.h>
 108#include <linux/route.h>
 109#include <linux/netfilter.h>
 110#include <linux/seq_file.h>
 111#include <net/sock.h>
 112#include <net/tcp_states.h>
 113#include <net/flow.h>
 114#include <asm/ioctls.h>
 115#include <linux/capability.h>
 116#include <linux/mm.h>
 117#include <linux/interrupt.h>
 118#include <linux/proc_fs.h>
 119#include <linux/stat.h>
 120#include <linux/init.h>
 121#include <linux/poll.h>
 122#include <linux/jiffies.h>
 123#include <net/net_namespace.h>
 124#include <net/neighbour.h>
 125#include <net/dst.h>
 126#include <net/fib_rules.h>
 127#include <net/tcp.h>
 128#include <net/dn.h>
 129#include <net/dn_nsp.h>
 130#include <net/dn_dev.h>
 131#include <net/dn_route.h>
 132#include <net/dn_fib.h>
 133#include <net/dn_neigh.h>
 134
 135struct dn_sock {
 136	struct sock sk;
 137	struct dn_scp scp;
 138};
 139
 140static void dn_keepalive(struct sock *sk);
 141
 142#define DN_SK_HASH_SHIFT 8
 143#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
 144#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
 145
 146
 147static const struct proto_ops dn_proto_ops;
 148static DEFINE_RWLOCK(dn_hash_lock);
 149static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 150static struct hlist_head dn_wild_sk;
 151static atomic_long_t decnet_memory_allocated;
 152
 153static int __dn_setsockopt(struct socket *sock, int level, int optname,
 154		sockptr_t optval, unsigned int optlen, int flags);
 155static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 156
 157static struct hlist_head *dn_find_list(struct sock *sk)
 158{
 159	struct dn_scp *scp = DN_SK(sk);
 160
 161	if (scp->addr.sdn_flags & SDF_WILD)
 162		return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 163
 164	return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
 165}
 166
 167/*
 168 * Valid ports are those greater than zero and not already in use.
 169 */
 170static int check_port(__le16 port)
 171{
 172	struct sock *sk;
 173
 174	if (port == 0)
 175		return -1;
 176
 177	sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
 178		struct dn_scp *scp = DN_SK(sk);
 179		if (scp->addrloc == port)
 180			return -1;
 181	}
 182	return 0;
 183}
 184
 185static unsigned short port_alloc(struct sock *sk)
 186{
 187	struct dn_scp *scp = DN_SK(sk);
 188	static unsigned short port = 0x2000;
 189	unsigned short i_port = port;
 190
 191	while(check_port(cpu_to_le16(++port)) != 0) {
 192		if (port == i_port)
 193			return 0;
 194	}
 195
 196	scp->addrloc = cpu_to_le16(port);
 197
 198	return 1;
 199}
 200
 201/*
 202 * Since this is only ever called from user
 203 * level, we don't need a write_lock() version
 204 * of this.
 205 */
 206static int dn_hash_sock(struct sock *sk)
 207{
 208	struct dn_scp *scp = DN_SK(sk);
 209	struct hlist_head *list;
 210	int rv = -EUSERS;
 211
 212	BUG_ON(sk_hashed(sk));
 213
 214	write_lock_bh(&dn_hash_lock);
 215
 216	if (!scp->addrloc && !port_alloc(sk))
 217		goto out;
 218
 219	rv = -EADDRINUSE;
 220	if ((list = dn_find_list(sk)) == NULL)
 221		goto out;
 222
 223	sk_add_node(sk, list);
 224	rv = 0;
 225out:
 226	write_unlock_bh(&dn_hash_lock);
 227	return rv;
 228}
 229
 230static void dn_unhash_sock(struct sock *sk)
 231{
 232	write_lock(&dn_hash_lock);
 233	sk_del_node_init(sk);
 234	write_unlock(&dn_hash_lock);
 235}
 236
 237static void dn_unhash_sock_bh(struct sock *sk)
 238{
 239	write_lock_bh(&dn_hash_lock);
 240	sk_del_node_init(sk);
 241	write_unlock_bh(&dn_hash_lock);
 242}
 243
 244static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 245{
 246	int i;
 247	unsigned int hash = addr->sdn_objnum;
 248
 249	if (hash == 0) {
 250		hash = addr->sdn_objnamel;
 251		for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
 252			hash ^= addr->sdn_objname[i];
 253			hash ^= (hash << 3);
 254		}
 255	}
 256
 257	return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 258}
 259
 260/*
 261 * Called to transform a socket from bound (i.e. with a local address)
 262 * into a listening socket (doesn't need a local port number) and rehashes
 263 * based upon the object name/number.
 264 */
 265static void dn_rehash_sock(struct sock *sk)
 266{
 267	struct hlist_head *list;
 268	struct dn_scp *scp = DN_SK(sk);
 269
 270	if (scp->addr.sdn_flags & SDF_WILD)
 271		return;
 272
 273	write_lock_bh(&dn_hash_lock);
 274	sk_del_node_init(sk);
 275	DN_SK(sk)->addrloc = 0;
 276	list = listen_hash(&DN_SK(sk)->addr);
 277	sk_add_node(sk, list);
 278	write_unlock_bh(&dn_hash_lock);
 279}
 280
 281int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 282{
 283	int len = 2;
 284
 285	*buf++ = type;
 286
 287	switch (type) {
 288	case 0:
 289		*buf++ = sdn->sdn_objnum;
 290		break;
 291	case 1:
 292		*buf++ = 0;
 293		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
 294		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 295		len = 3 + le16_to_cpu(sdn->sdn_objnamel);
 296		break;
 297	case 2:
 298		memset(buf, 0, 5);
 299		buf += 5;
 300		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
 301		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 302		len = 7 + le16_to_cpu(sdn->sdn_objnamel);
 303		break;
 304	}
 305
 306	return len;
 307}
 308
 309/*
 310 * On reception of usernames, we handle types 1 and 0 for destination
 311 * addresses only. Types 2 and 4 are used for source addresses, but the
 312 * UIC, GIC are ignored and they are both treated the same way. Type 3
 313 * is never used as I've no idea what its purpose might be or what its
 314 * format is.
 315 */
 316int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 317{
 318	unsigned char type;
 319	int size = len;
 320	int namel = 12;
 321
 322	sdn->sdn_objnum = 0;
 323	sdn->sdn_objnamel = cpu_to_le16(0);
 324	memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 325
 326	if (len < 2)
 327		return -1;
 328
 329	len -= 2;
 330	*fmt = *data++;
 331	type = *data++;
 332
 333	switch (*fmt) {
 334	case 0:
 335		sdn->sdn_objnum = type;
 336		return 2;
 337	case 1:
 338		namel = 16;
 339		break;
 340	case 2:
 341		len  -= 4;
 342		data += 4;
 343		break;
 344	case 4:
 345		len  -= 8;
 346		data += 8;
 347		break;
 348	default:
 349		return -1;
 350	}
 351
 352	len -= 1;
 353
 354	if (len < 0)
 355		return -1;
 356
 357	sdn->sdn_objnamel = cpu_to_le16(*data++);
 358	len -= le16_to_cpu(sdn->sdn_objnamel);
 359
 360	if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
 361		return -1;
 362
 363	memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
 364
 365	return size - len;
 366}
 367
 368struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 369{
 370	struct hlist_head *list = listen_hash(addr);
 371	struct sock *sk;
 372
 373	read_lock(&dn_hash_lock);
 374	sk_for_each(sk, list) {
 375		struct dn_scp *scp = DN_SK(sk);
 376		if (sk->sk_state != TCP_LISTEN)
 377			continue;
 378		if (scp->addr.sdn_objnum) {
 379			if (scp->addr.sdn_objnum != addr->sdn_objnum)
 380				continue;
 381		} else {
 382			if (addr->sdn_objnum)
 383				continue;
 384			if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 385				continue;
 386			if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
 387				continue;
 388		}
 389		sock_hold(sk);
 390		read_unlock(&dn_hash_lock);
 391		return sk;
 392	}
 393
 394	sk = sk_head(&dn_wild_sk);
 395	if (sk) {
 396		if (sk->sk_state == TCP_LISTEN)
 397			sock_hold(sk);
 398		else
 399			sk = NULL;
 400	}
 401
 402	read_unlock(&dn_hash_lock);
 403	return sk;
 404}
 405
 406struct sock *dn_find_by_skb(struct sk_buff *skb)
 407{
 408	struct dn_skb_cb *cb = DN_SKB_CB(skb);
 409	struct sock *sk;
 410	struct dn_scp *scp;
 411
 412	read_lock(&dn_hash_lock);
 413	sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
 414		scp = DN_SK(sk);
 415		if (cb->src != dn_saddr2dn(&scp->peer))
 416			continue;
 417		if (cb->dst_port != scp->addrloc)
 418			continue;
 419		if (scp->addrrem && (cb->src_port != scp->addrrem))
 420			continue;
 421		sock_hold(sk);
 422		goto found;
 423	}
 424	sk = NULL;
 425found:
 426	read_unlock(&dn_hash_lock);
 427	return sk;
 428}
 429
 430
 431
 432static void dn_destruct(struct sock *sk)
 433{
 434	struct dn_scp *scp = DN_SK(sk);
 435
 436	skb_queue_purge(&scp->data_xmit_queue);
 437	skb_queue_purge(&scp->other_xmit_queue);
 438	skb_queue_purge(&scp->other_receive_queue);
 439
 440	dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
 441}
 442
 443static unsigned long dn_memory_pressure;
 444
 445static void dn_enter_memory_pressure(struct sock *sk)
 446{
 447	if (!dn_memory_pressure) {
 448		dn_memory_pressure = 1;
 449	}
 450}
 451
 452static struct proto dn_proto = {
 453	.name			= "NSP",
 454	.owner			= THIS_MODULE,
 455	.enter_memory_pressure	= dn_enter_memory_pressure,
 456	.memory_pressure	= &dn_memory_pressure,
 457	.memory_allocated	= &decnet_memory_allocated,
 458	.sysctl_mem		= sysctl_decnet_mem,
 459	.sysctl_wmem		= sysctl_decnet_wmem,
 460	.sysctl_rmem		= sysctl_decnet_rmem,
 461	.max_header		= DN_MAX_NSP_DATA_HEADER + 64,
 462	.obj_size		= sizeof(struct dn_sock),
 463};
 464
 465static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
 466{
 467	struct dn_scp *scp;
 468	struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
 469
 470	if  (!sk)
 471		goto out;
 472
 473	if (sock)
 474		sock->ops = &dn_proto_ops;
 475	sock_init_data(sock, sk);
 476
 477	sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 478	sk->sk_destruct    = dn_destruct;
 479	sk->sk_no_check_tx = 1;
 480	sk->sk_family      = PF_DECnet;
 481	sk->sk_protocol    = 0;
 482	sk->sk_allocation  = gfp;
 483	sk->sk_sndbuf	   = sysctl_decnet_wmem[1];
 484	sk->sk_rcvbuf	   = sysctl_decnet_rmem[1];
 485
 486	/* Initialization of DECnet Session Control Port		*/
 487	scp = DN_SK(sk);
 488	scp->state	= DN_O;		/* Open			*/
 489	scp->numdat	= 1;		/* Next data seg to tx	*/
 490	scp->numoth	= 1;		/* Next oth data to tx  */
 491	scp->ackxmt_dat = 0;		/* Last data seg ack'ed */
 492	scp->ackxmt_oth = 0;		/* Last oth data ack'ed */
 493	scp->ackrcv_dat = 0;		/* Highest data ack recv*/
 494	scp->ackrcv_oth = 0;		/* Last oth data ack rec*/
 495	scp->flowrem_sw = DN_SEND;
 496	scp->flowloc_sw = DN_SEND;
 497	scp->flowrem_dat = 0;
 498	scp->flowrem_oth = 1;
 499	scp->flowloc_dat = 0;
 500	scp->flowloc_oth = 1;
 501	scp->services_rem = 0;
 502	scp->services_loc = 1 | NSP_FC_NONE;
 503	scp->info_rem = 0;
 504	scp->info_loc = 0x03; /* NSP version 4.1 */
 505	scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 506	scp->nonagle = 0;
 507	scp->multi_ireq = 1;
 508	scp->accept_mode = ACC_IMMED;
 509	scp->addr.sdn_family    = AF_DECnet;
 510	scp->peer.sdn_family    = AF_DECnet;
 511	scp->accessdata.acc_accl = 5;
 512	memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 513
 514	scp->max_window   = NSP_MAX_WINDOW;
 515	scp->snd_window   = NSP_MIN_WINDOW;
 516	scp->nsp_srtt     = NSP_INITIAL_SRTT;
 517	scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 518	scp->nsp_rxtshift = 0;
 519
 520	skb_queue_head_init(&scp->data_xmit_queue);
 521	skb_queue_head_init(&scp->other_xmit_queue);
 522	skb_queue_head_init(&scp->other_receive_queue);
 523
 524	scp->persist = 0;
 525	scp->persist_fxn = NULL;
 526	scp->keepalive = 10 * HZ;
 527	scp->keepalive_fxn = dn_keepalive;
 528
 
 
 
 
 529	dn_start_slow_timer(sk);
 530out:
 531	return sk;
 532}
 533
 534/*
 535 * Keepalive timer.
 536 * FIXME: Should respond to SO_KEEPALIVE etc.
 537 */
 538static void dn_keepalive(struct sock *sk)
 539{
 540	struct dn_scp *scp = DN_SK(sk);
 541
 542	/*
 543	 * By checking the other_data transmit queue is empty
 544	 * we are double checking that we are not sending too
 545	 * many of these keepalive frames.
 546	 */
 547	if (skb_queue_empty(&scp->other_xmit_queue))
 548		dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 549}
 550
 551
 552/*
 553 * Timer for shutdown/destroyed sockets.
 554 * When socket is dead & no packets have been sent for a
 555 * certain amount of time, they are removed by this
 556 * routine. Also takes care of sending out DI & DC
 557 * frames at correct times.
 558 */
 559int dn_destroy_timer(struct sock *sk)
 560{
 561	struct dn_scp *scp = DN_SK(sk);
 562
 563	scp->persist = dn_nsp_persist(sk);
 564
 565	switch (scp->state) {
 566	case DN_DI:
 567		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 568		if (scp->nsp_rxtshift >= decnet_di_count)
 569			scp->state = DN_CN;
 570		return 0;
 571
 572	case DN_DR:
 573		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 574		if (scp->nsp_rxtshift >= decnet_dr_count)
 575			scp->state = DN_DRC;
 576		return 0;
 577
 578	case DN_DN:
 579		if (scp->nsp_rxtshift < decnet_dn_count) {
 580			/* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 581			dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 582					 GFP_ATOMIC);
 583			return 0;
 584		}
 585	}
 586
 587	scp->persist = (HZ * decnet_time_wait);
 588
 589	if (sk->sk_socket)
 590		return 0;
 591
 592	if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
 593		dn_unhash_sock(sk);
 594		sock_put(sk);
 595		return 1;
 596	}
 597
 598	return 0;
 599}
 600
 601static void dn_destroy_sock(struct sock *sk)
 602{
 603	struct dn_scp *scp = DN_SK(sk);
 604
 605	scp->nsp_rxtshift = 0; /* reset back off */
 606
 607	if (sk->sk_socket) {
 608		if (sk->sk_socket->state != SS_UNCONNECTED)
 609			sk->sk_socket->state = SS_DISCONNECTING;
 610	}
 611
 612	sk->sk_state = TCP_CLOSE;
 613
 614	switch (scp->state) {
 615	case DN_DN:
 616		dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 617				 sk->sk_allocation);
 618		scp->persist_fxn = dn_destroy_timer;
 619		scp->persist = dn_nsp_persist(sk);
 620		break;
 621	case DN_CR:
 622		scp->state = DN_DR;
 623		goto disc_reject;
 624	case DN_RUN:
 625		scp->state = DN_DI;
 626		fallthrough;
 627	case DN_DI:
 628	case DN_DR:
 629disc_reject:
 630		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 631		fallthrough;
 632	case DN_NC:
 633	case DN_NR:
 634	case DN_RJ:
 635	case DN_DIC:
 636	case DN_CN:
 637	case DN_DRC:
 638	case DN_CI:
 639	case DN_CD:
 640		scp->persist_fxn = dn_destroy_timer;
 641		scp->persist = dn_nsp_persist(sk);
 642		break;
 643	default:
 644		printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 645		fallthrough;
 646	case DN_O:
 647		dn_stop_slow_timer(sk);
 648
 649		dn_unhash_sock_bh(sk);
 650		sock_put(sk);
 651
 652		break;
 653	}
 654}
 655
 656char *dn_addr2asc(__u16 addr, char *buf)
 657{
 658	unsigned short node, area;
 659
 660	node = addr & 0x03ff;
 661	area = addr >> 10;
 662	sprintf(buf, "%hd.%hd", area, node);
 663
 664	return buf;
 665}
 666
 667
 668
 669static int dn_create(struct net *net, struct socket *sock, int protocol,
 670		     int kern)
 671{
 672	struct sock *sk;
 673
 674	if (protocol < 0 || protocol > U8_MAX)
 675		return -EINVAL;
 676
 677	if (!net_eq(net, &init_net))
 678		return -EAFNOSUPPORT;
 679
 680	switch (sock->type) {
 681	case SOCK_SEQPACKET:
 682		if (protocol != DNPROTO_NSP)
 683			return -EPROTONOSUPPORT;
 684		break;
 685	case SOCK_STREAM:
 686		break;
 687	default:
 688		return -ESOCKTNOSUPPORT;
 689	}
 690
 691
 692	if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
 693		return -ENOBUFS;
 694
 695	sk->sk_protocol = protocol;
 696
 697	return 0;
 698}
 699
 700
 701static int
 702dn_release(struct socket *sock)
 703{
 704	struct sock *sk = sock->sk;
 705
 706	if (sk) {
 707		sock_orphan(sk);
 708		sock_hold(sk);
 709		lock_sock(sk);
 710		dn_destroy_sock(sk);
 711		release_sock(sk);
 712		sock_put(sk);
 713	}
 714
 715	return 0;
 716}
 717
 718static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 719{
 720	struct sock *sk = sock->sk;
 721	struct dn_scp *scp = DN_SK(sk);
 722	struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 723	struct net_device *dev, *ldev;
 724	int rv;
 725
 726	if (addr_len != sizeof(struct sockaddr_dn))
 727		return -EINVAL;
 728
 729	if (saddr->sdn_family != AF_DECnet)
 730		return -EINVAL;
 731
 732	if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 733		return -EINVAL;
 734
 735	if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
 736		return -EINVAL;
 737
 738	if (saddr->sdn_flags & ~SDF_WILD)
 739		return -EINVAL;
 740
 741	if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 742	    (saddr->sdn_flags & SDF_WILD)))
 743		return -EACCES;
 744
 745	if (!(saddr->sdn_flags & SDF_WILD)) {
 746		if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
 747			rcu_read_lock();
 748			ldev = NULL;
 749			for_each_netdev_rcu(&init_net, dev) {
 750				if (!dev->dn_ptr)
 751					continue;
 752				if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 753					ldev = dev;
 754					break;
 755				}
 756			}
 757			rcu_read_unlock();
 758			if (ldev == NULL)
 759				return -EADDRNOTAVAIL;
 760		}
 761	}
 762
 763	rv = -EINVAL;
 764	lock_sock(sk);
 765	if (sock_flag(sk, SOCK_ZAPPED)) {
 766		memcpy(&scp->addr, saddr, addr_len);
 767		sock_reset_flag(sk, SOCK_ZAPPED);
 768
 769		rv = dn_hash_sock(sk);
 770		if (rv)
 771			sock_set_flag(sk, SOCK_ZAPPED);
 772	}
 773	release_sock(sk);
 774
 775	return rv;
 776}
 777
 778
 779static int dn_auto_bind(struct socket *sock)
 780{
 781	struct sock *sk = sock->sk;
 782	struct dn_scp *scp = DN_SK(sk);
 783	int rv;
 784
 785	sock_reset_flag(sk, SOCK_ZAPPED);
 786
 787	scp->addr.sdn_flags  = 0;
 788	scp->addr.sdn_objnum = 0;
 789
 790	/*
 791	 * This stuff is to keep compatibility with Eduardo's
 792	 * patch. I hope I can dispense with it shortly...
 793	 */
 794	if ((scp->accessdata.acc_accl != 0) &&
 795		(scp->accessdata.acc_accl <= 12)) {
 796
 797		scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
 798		memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
 799
 800		scp->accessdata.acc_accl = 0;
 801		memset(scp->accessdata.acc_acc, 0, 40);
 802	}
 803	/* End of compatibility stuff */
 804
 805	scp->addr.sdn_add.a_len = cpu_to_le16(2);
 806	rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 807	if (rv == 0) {
 808		rv = dn_hash_sock(sk);
 809		if (rv)
 810			sock_set_flag(sk, SOCK_ZAPPED);
 811	}
 812
 813	return rv;
 814}
 815
 816static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 817{
 818	struct dn_scp *scp = DN_SK(sk);
 819	DEFINE_WAIT_FUNC(wait, woken_wake_function);
 820	int err;
 821
 822	if (scp->state != DN_CR)
 823		return -EINVAL;
 824
 825	scp->state = DN_CC;
 826	scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
 827	dn_send_conn_conf(sk, allocation);
 828
 829	add_wait_queue(sk_sleep(sk), &wait);
 830	for(;;) {
 831		release_sock(sk);
 832		if (scp->state == DN_CC)
 833			*timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
 834		lock_sock(sk);
 835		err = 0;
 836		if (scp->state == DN_RUN)
 837			break;
 838		err = sock_error(sk);
 839		if (err)
 840			break;
 841		err = sock_intr_errno(*timeo);
 842		if (signal_pending(current))
 843			break;
 844		err = -EAGAIN;
 845		if (!*timeo)
 846			break;
 
 847	}
 848	remove_wait_queue(sk_sleep(sk), &wait);
 849	if (err == 0) {
 850		sk->sk_socket->state = SS_CONNECTED;
 851	} else if (scp->state != DN_CC) {
 852		sk->sk_socket->state = SS_UNCONNECTED;
 853	}
 854	return err;
 855}
 856
 857static int dn_wait_run(struct sock *sk, long *timeo)
 858{
 859	struct dn_scp *scp = DN_SK(sk);
 860	DEFINE_WAIT_FUNC(wait, woken_wake_function);
 861	int err = 0;
 862
 863	if (scp->state == DN_RUN)
 864		goto out;
 865
 866	if (!*timeo)
 867		return -EALREADY;
 868
 869	add_wait_queue(sk_sleep(sk), &wait);
 870	for(;;) {
 871		release_sock(sk);
 872		if (scp->state == DN_CI || scp->state == DN_CC)
 873			*timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
 874		lock_sock(sk);
 875		err = 0;
 876		if (scp->state == DN_RUN)
 877			break;
 878		err = sock_error(sk);
 879		if (err)
 880			break;
 881		err = sock_intr_errno(*timeo);
 882		if (signal_pending(current))
 883			break;
 884		err = -ETIMEDOUT;
 885		if (!*timeo)
 886			break;
 
 887	}
 888	remove_wait_queue(sk_sleep(sk), &wait);
 889out:
 890	if (err == 0) {
 891		sk->sk_socket->state = SS_CONNECTED;
 892	} else if (scp->state != DN_CI && scp->state != DN_CC) {
 893		sk->sk_socket->state = SS_UNCONNECTED;
 894	}
 895	return err;
 896}
 897
 898static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 899{
 900	struct socket *sock = sk->sk_socket;
 901	struct dn_scp *scp = DN_SK(sk);
 902	int err = -EISCONN;
 903	struct flowidn fld;
 904	struct dst_entry *dst;
 905
 906	if (sock->state == SS_CONNECTED)
 907		goto out;
 908
 909	if (sock->state == SS_CONNECTING) {
 910		err = 0;
 911		if (scp->state == DN_RUN) {
 912			sock->state = SS_CONNECTED;
 913			goto out;
 914		}
 915		err = -ECONNREFUSED;
 916		if (scp->state != DN_CI && scp->state != DN_CC) {
 917			sock->state = SS_UNCONNECTED;
 918			goto out;
 919		}
 920		return dn_wait_run(sk, timeo);
 921	}
 922
 923	err = -EINVAL;
 924	if (scp->state != DN_O)
 925		goto out;
 926
 927	if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 928		goto out;
 929	if (addr->sdn_family != AF_DECnet)
 930		goto out;
 931	if (addr->sdn_flags & SDF_WILD)
 932		goto out;
 933
 934	if (sock_flag(sk, SOCK_ZAPPED)) {
 935		err = dn_auto_bind(sk->sk_socket);
 936		if (err)
 937			goto out;
 938	}
 939
 940	memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 941
 942	err = -EHOSTUNREACH;
 943	memset(&fld, 0, sizeof(fld));
 944	fld.flowidn_oif = sk->sk_bound_dev_if;
 945	fld.daddr = dn_saddr2dn(&scp->peer);
 946	fld.saddr = dn_saddr2dn(&scp->addr);
 947	dn_sk_ports_copy(&fld, scp);
 948	fld.flowidn_proto = DNPROTO_NSP;
 949	if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
 950		goto out;
 951	dst = __sk_dst_get(sk);
 952	sk->sk_route_caps = dst->dev->features;
 953	sock->state = SS_CONNECTING;
 954	scp->state = DN_CI;
 955	scp->segsize_loc = dst_metric_advmss(dst);
 956
 957	dn_nsp_send_conninit(sk, NSP_CI);
 958	err = -EINPROGRESS;
 959	if (*timeo) {
 960		err = dn_wait_run(sk, timeo);
 961	}
 962out:
 963	return err;
 964}
 965
 966static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 967{
 968	struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 969	struct sock *sk = sock->sk;
 970	int err;
 971	long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 972
 973	lock_sock(sk);
 974	err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 975	release_sock(sk);
 976
 977	return err;
 978}
 979
 980static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 981{
 982	struct dn_scp *scp = DN_SK(sk);
 983
 984	switch (scp->state) {
 985	case DN_RUN:
 986		return 0;
 987	case DN_CR:
 988		return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 989	case DN_CI:
 990	case DN_CC:
 991		return dn_wait_run(sk, timeo);
 992	case DN_O:
 993		return __dn_connect(sk, addr, addrlen, timeo, flags);
 994	}
 995
 996	return -EINVAL;
 997}
 998
 999
1000static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1001{
1002	unsigned char *ptr = skb->data;
1003
1004	acc->acc_userl = *ptr++;
1005	memcpy(&acc->acc_user, ptr, acc->acc_userl);
1006	ptr += acc->acc_userl;
1007
1008	acc->acc_passl = *ptr++;
1009	memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1010	ptr += acc->acc_passl;
1011
1012	acc->acc_accl = *ptr++;
1013	memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1014
1015	skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1016
1017}
1018
1019static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1020{
1021	unsigned char *ptr = skb->data;
1022	u16 len = *ptr++; /* yes, it's 8bit on the wire */
1023
1024	BUG_ON(len > 16); /* we've checked the contents earlier */
1025	opt->opt_optl   = cpu_to_le16(len);
1026	opt->opt_status = 0;
1027	memcpy(opt->opt_data, ptr, len);
1028	skb_pull(skb, len + 1);
1029}
1030
1031static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1032{
1033	DEFINE_WAIT_FUNC(wait, woken_wake_function);
1034	struct sk_buff *skb = NULL;
1035	int err = 0;
1036
1037	add_wait_queue(sk_sleep(sk), &wait);
1038	for(;;) {
1039		release_sock(sk);
1040		skb = skb_dequeue(&sk->sk_receive_queue);
1041		if (skb == NULL) {
1042			*timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
1043			skb = skb_dequeue(&sk->sk_receive_queue);
1044		}
1045		lock_sock(sk);
1046		if (skb != NULL)
1047			break;
1048		err = -EINVAL;
1049		if (sk->sk_state != TCP_LISTEN)
1050			break;
1051		err = sock_intr_errno(*timeo);
1052		if (signal_pending(current))
1053			break;
1054		err = -EAGAIN;
1055		if (!*timeo)
1056			break;
 
1057	}
1058	remove_wait_queue(sk_sleep(sk), &wait);
1059
1060	return skb == NULL ? ERR_PTR(err) : skb;
1061}
1062
1063static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
1064		     bool kern)
1065{
1066	struct sock *sk = sock->sk, *newsk;
1067	struct sk_buff *skb = NULL;
1068	struct dn_skb_cb *cb;
1069	unsigned char menuver;
1070	int err = 0;
1071	unsigned char type;
1072	long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1073	struct dst_entry *dst;
1074
1075	lock_sock(sk);
1076
1077	if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1078		release_sock(sk);
1079		return -EINVAL;
1080	}
1081
1082	skb = skb_dequeue(&sk->sk_receive_queue);
1083	if (skb == NULL) {
1084		skb = dn_wait_for_connect(sk, &timeo);
1085		if (IS_ERR(skb)) {
1086			release_sock(sk);
1087			return PTR_ERR(skb);
1088		}
1089	}
1090
1091	cb = DN_SKB_CB(skb);
1092	sk_acceptq_removed(sk);
1093	newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1094	if (newsk == NULL) {
1095		release_sock(sk);
1096		kfree_skb(skb);
1097		return -ENOBUFS;
1098	}
1099	release_sock(sk);
1100
1101	dst = skb_dst(skb);
1102	sk_dst_set(newsk, dst);
1103	skb_dst_set(skb, NULL);
1104
1105	DN_SK(newsk)->state        = DN_CR;
1106	DN_SK(newsk)->addrrem      = cb->src_port;
1107	DN_SK(newsk)->services_rem = cb->services;
1108	DN_SK(newsk)->info_rem     = cb->info;
1109	DN_SK(newsk)->segsize_rem  = cb->segsize;
1110	DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1111
1112	if (DN_SK(newsk)->segsize_rem < 230)
1113		DN_SK(newsk)->segsize_rem = 230;
1114
1115	if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1116		DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1117
1118	newsk->sk_state  = TCP_LISTEN;
1119	memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1120
1121	/*
1122	 * If we are listening on a wild socket, we don't want
1123	 * the newly created socket on the wrong hash queue.
1124	 */
1125	DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1126
1127	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1128	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1129	*(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1130	*(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1131
1132	menuver = *skb->data;
1133	skb_pull(skb, 1);
1134
1135	if (menuver & DN_MENUVER_ACC)
1136		dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1137
1138	if (menuver & DN_MENUVER_USR)
1139		dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1140
1141	if (menuver & DN_MENUVER_PRX)
1142		DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1143
1144	if (menuver & DN_MENUVER_UIC)
1145		DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1146
1147	kfree_skb(skb);
1148
1149	memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1150		sizeof(struct optdata_dn));
1151	memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1152		sizeof(struct optdata_dn));
1153
1154	lock_sock(newsk);
1155	err = dn_hash_sock(newsk);
1156	if (err == 0) {
1157		sock_reset_flag(newsk, SOCK_ZAPPED);
1158		dn_send_conn_ack(newsk);
1159
1160		/*
1161		 * Here we use sk->sk_allocation since although the conn conf is
1162		 * for the newsk, the context is the old socket.
1163		 */
1164		if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1165			err = dn_confirm_accept(newsk, &timeo,
1166						sk->sk_allocation);
1167	}
1168	release_sock(newsk);
1169	return err;
1170}
1171
1172
1173static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int peer)
1174{
1175	struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1176	struct sock *sk = sock->sk;
1177	struct dn_scp *scp = DN_SK(sk);
1178
 
 
1179	lock_sock(sk);
1180
1181	if (peer) {
1182		if ((sock->state != SS_CONNECTED &&
1183		     sock->state != SS_CONNECTING) &&
1184		    scp->accept_mode == ACC_IMMED) {
1185			release_sock(sk);
1186			return -ENOTCONN;
1187		}
1188
1189		memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1190	} else {
1191		memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1192	}
1193
1194	release_sock(sk);
1195
1196	return sizeof(struct sockaddr_dn);
1197}
1198
1199
1200static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1201{
1202	struct sock *sk = sock->sk;
1203	struct dn_scp *scp = DN_SK(sk);
1204	__poll_t mask = datagram_poll(file, sock, wait);
1205
1206	if (!skb_queue_empty_lockless(&scp->other_receive_queue))
1207		mask |= EPOLLRDBAND;
1208
1209	return mask;
1210}
1211
1212static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1213{
1214	struct sock *sk = sock->sk;
1215	struct dn_scp *scp = DN_SK(sk);
1216	int err = -EOPNOTSUPP;
1217	long amount = 0;
1218	struct sk_buff *skb;
1219	int val;
1220
1221	switch(cmd)
1222	{
1223	case SIOCGIFADDR:
1224	case SIOCSIFADDR:
1225		return dn_dev_ioctl(cmd, (void __user *)arg);
1226
1227	case SIOCATMARK:
1228		lock_sock(sk);
1229		val = !skb_queue_empty(&scp->other_receive_queue);
1230		if (scp->state != DN_RUN)
1231			val = -ENOTCONN;
1232		release_sock(sk);
1233		return val;
1234
1235	case TIOCOUTQ:
1236		amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1237		if (amount < 0)
1238			amount = 0;
1239		err = put_user(amount, (int __user *)arg);
1240		break;
1241
1242	case TIOCINQ:
1243		lock_sock(sk);
1244		skb = skb_peek(&scp->other_receive_queue);
1245		if (skb) {
1246			amount = skb->len;
1247		} else {
1248			skb_queue_walk(&sk->sk_receive_queue, skb)
1249				amount += skb->len;
1250		}
1251		release_sock(sk);
1252		err = put_user(amount, (int __user *)arg);
1253		break;
1254
1255	default:
1256		err = -ENOIOCTLCMD;
1257		break;
1258	}
1259
1260	return err;
1261}
1262
1263static int dn_listen(struct socket *sock, int backlog)
1264{
1265	struct sock *sk = sock->sk;
1266	int err = -EINVAL;
1267
1268	lock_sock(sk);
1269
1270	if (sock_flag(sk, SOCK_ZAPPED))
1271		goto out;
1272
1273	if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1274		goto out;
1275
1276	sk->sk_max_ack_backlog = backlog;
1277	sk->sk_ack_backlog     = 0;
1278	sk->sk_state           = TCP_LISTEN;
1279	err                 = 0;
1280	dn_rehash_sock(sk);
1281
1282out:
1283	release_sock(sk);
1284
1285	return err;
1286}
1287
1288
1289static int dn_shutdown(struct socket *sock, int how)
1290{
1291	struct sock *sk = sock->sk;
1292	struct dn_scp *scp = DN_SK(sk);
1293	int err = -ENOTCONN;
1294
1295	lock_sock(sk);
1296
1297	if (sock->state == SS_UNCONNECTED)
1298		goto out;
1299
1300	err = 0;
1301	if (sock->state == SS_DISCONNECTING)
1302		goto out;
1303
1304	err = -EINVAL;
1305	if (scp->state == DN_O)
1306		goto out;
1307
1308	if (how != SHUT_RDWR)
1309		goto out;
1310
1311	sk->sk_shutdown = SHUTDOWN_MASK;
1312	dn_destroy_sock(sk);
1313	err = 0;
1314
1315out:
1316	release_sock(sk);
1317
1318	return err;
1319}
1320
1321static int dn_setsockopt(struct socket *sock, int level, int optname,
1322		sockptr_t optval, unsigned int optlen)
1323{
1324	struct sock *sk = sock->sk;
1325	int err;
1326
1327	lock_sock(sk);
1328	err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1329	release_sock(sk);
1330#ifdef CONFIG_NETFILTER
1331	/* we need to exclude all possible ENOPROTOOPTs except default case */
1332	if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
1333	    optname != DSO_STREAM && optname != DSO_SEQPACKET)
1334		err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1335#endif
1336
1337	return err;
1338}
1339
1340static int __dn_setsockopt(struct socket *sock, int level, int optname,
1341		sockptr_t optval, unsigned int optlen, int flags)
1342{
1343	struct	sock *sk = sock->sk;
1344	struct dn_scp *scp = DN_SK(sk);
1345	long timeo;
1346	union {
1347		struct optdata_dn opt;
1348		struct accessdata_dn acc;
1349		int mode;
1350		unsigned long win;
1351		int val;
1352		unsigned char services;
1353		unsigned char info;
1354	} u;
1355	int err;
1356
1357	if (optlen && sockptr_is_null(optval))
1358		return -EINVAL;
1359
1360	if (optlen > sizeof(u))
1361		return -EINVAL;
1362
1363	if (copy_from_sockptr(&u, optval, optlen))
1364		return -EFAULT;
1365
1366	switch (optname) {
1367	case DSO_CONDATA:
1368		if (sock->state == SS_CONNECTED)
1369			return -EISCONN;
1370		if ((scp->state != DN_O) && (scp->state != DN_CR))
1371			return -EINVAL;
1372
1373		if (optlen != sizeof(struct optdata_dn))
1374			return -EINVAL;
1375
1376		if (le16_to_cpu(u.opt.opt_optl) > 16)
1377			return -EINVAL;
1378
1379		memcpy(&scp->conndata_out, &u.opt, optlen);
1380		break;
1381
1382	case DSO_DISDATA:
1383		if (sock->state != SS_CONNECTED &&
1384		    scp->accept_mode == ACC_IMMED)
1385			return -ENOTCONN;
1386
1387		if (optlen != sizeof(struct optdata_dn))
1388			return -EINVAL;
1389
1390		if (le16_to_cpu(u.opt.opt_optl) > 16)
1391			return -EINVAL;
1392
1393		memcpy(&scp->discdata_out, &u.opt, optlen);
1394		break;
1395
1396	case DSO_CONACCESS:
1397		if (sock->state == SS_CONNECTED)
1398			return -EISCONN;
1399		if (scp->state != DN_O)
1400			return -EINVAL;
1401
1402		if (optlen != sizeof(struct accessdata_dn))
1403			return -EINVAL;
1404
1405		if ((u.acc.acc_accl > DN_MAXACCL) ||
1406		    (u.acc.acc_passl > DN_MAXACCL) ||
1407		    (u.acc.acc_userl > DN_MAXACCL))
1408			return -EINVAL;
1409
1410		memcpy(&scp->accessdata, &u.acc, optlen);
1411		break;
1412
1413	case DSO_ACCEPTMODE:
1414		if (sock->state == SS_CONNECTED)
1415			return -EISCONN;
1416		if (scp->state != DN_O)
1417			return -EINVAL;
1418
1419		if (optlen != sizeof(int))
1420			return -EINVAL;
1421
1422		if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1423			return -EINVAL;
1424
1425		scp->accept_mode = (unsigned char)u.mode;
1426		break;
1427
1428	case DSO_CONACCEPT:
1429		if (scp->state != DN_CR)
1430			return -EINVAL;
1431		timeo = sock_rcvtimeo(sk, 0);
1432		err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1433		return err;
1434
1435	case DSO_CONREJECT:
1436		if (scp->state != DN_CR)
1437			return -EINVAL;
1438
1439		scp->state = DN_DR;
1440		sk->sk_shutdown = SHUTDOWN_MASK;
1441		dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1442		break;
1443
 
 
 
 
 
 
 
 
 
1444	case DSO_MAXWINDOW:
1445		if (optlen != sizeof(unsigned long))
1446			return -EINVAL;
1447		if (u.win > NSP_MAX_WINDOW)
1448			u.win = NSP_MAX_WINDOW;
1449		if (u.win == 0)
1450			return -EINVAL;
1451		scp->max_window = u.win;
1452		if (scp->snd_window > u.win)
1453			scp->snd_window = u.win;
1454		break;
1455
1456	case DSO_NODELAY:
1457		if (optlen != sizeof(int))
1458			return -EINVAL;
1459		if (scp->nonagle == TCP_NAGLE_CORK)
1460			return -EINVAL;
1461		scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1462		/* if (scp->nonagle == 1) { Push pending frames } */
1463		break;
1464
1465	case DSO_CORK:
1466		if (optlen != sizeof(int))
1467			return -EINVAL;
1468		if (scp->nonagle == TCP_NAGLE_OFF)
1469			return -EINVAL;
1470		scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1471		/* if (scp->nonagle == 0) { Push pending frames } */
1472		break;
1473
1474	case DSO_SERVICES:
1475		if (optlen != sizeof(unsigned char))
1476			return -EINVAL;
1477		if ((u.services & ~NSP_FC_MASK) != 0x01)
1478			return -EINVAL;
1479		if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1480			return -EINVAL;
1481		scp->services_loc = u.services;
1482		break;
1483
1484	case DSO_INFO:
1485		if (optlen != sizeof(unsigned char))
1486			return -EINVAL;
1487		if (u.info & 0xfc)
1488			return -EINVAL;
1489		scp->info_loc = u.info;
1490		break;
1491
1492	case DSO_LINKINFO:
1493	case DSO_STREAM:
1494	case DSO_SEQPACKET:
1495	default:
1496		return -ENOPROTOOPT;
1497	}
1498
1499	return 0;
1500}
1501
1502static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1503{
1504	struct sock *sk = sock->sk;
1505	int err;
1506
1507	lock_sock(sk);
1508	err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1509	release_sock(sk);
1510#ifdef CONFIG_NETFILTER
1511	if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
1512	    optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
1513	    optname != DSO_CONREJECT) {
1514		int len;
1515
1516		if (get_user(len, optlen))
1517			return -EFAULT;
1518
1519		err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1520		if (err >= 0)
1521			err = put_user(len, optlen);
1522	}
1523#endif
1524
1525	return err;
1526}
1527
1528static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1529{
1530	struct	sock *sk = sock->sk;
1531	struct dn_scp *scp = DN_SK(sk);
1532	struct linkinfo_dn link;
1533	unsigned int r_len;
1534	void *r_data = NULL;
1535	unsigned int val;
1536
1537	if(get_user(r_len , optlen))
1538		return -EFAULT;
1539
1540	switch (optname) {
1541	case DSO_CONDATA:
1542		if (r_len > sizeof(struct optdata_dn))
1543			r_len = sizeof(struct optdata_dn);
1544		r_data = &scp->conndata_in;
1545		break;
1546
1547	case DSO_DISDATA:
1548		if (r_len > sizeof(struct optdata_dn))
1549			r_len = sizeof(struct optdata_dn);
1550		r_data = &scp->discdata_in;
1551		break;
1552
1553	case DSO_CONACCESS:
1554		if (r_len > sizeof(struct accessdata_dn))
1555			r_len = sizeof(struct accessdata_dn);
1556		r_data = &scp->accessdata;
1557		break;
1558
1559	case DSO_ACCEPTMODE:
1560		if (r_len > sizeof(unsigned char))
1561			r_len = sizeof(unsigned char);
1562		r_data = &scp->accept_mode;
1563		break;
1564
1565	case DSO_LINKINFO:
1566		if (r_len > sizeof(struct linkinfo_dn))
1567			r_len = sizeof(struct linkinfo_dn);
1568
1569		memset(&link, 0, sizeof(link));
1570
1571		switch (sock->state) {
1572		case SS_CONNECTING:
1573			link.idn_linkstate = LL_CONNECTING;
1574			break;
1575		case SS_DISCONNECTING:
1576			link.idn_linkstate = LL_DISCONNECTING;
1577			break;
1578		case SS_CONNECTED:
1579			link.idn_linkstate = LL_RUNNING;
1580			break;
1581		default:
1582			link.idn_linkstate = LL_INACTIVE;
1583		}
1584
1585		link.idn_segsize = scp->segsize_rem;
1586		r_data = &link;
1587		break;
1588
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1589	case DSO_MAXWINDOW:
1590		if (r_len > sizeof(unsigned long))
1591			r_len = sizeof(unsigned long);
1592		r_data = &scp->max_window;
1593		break;
1594
1595	case DSO_NODELAY:
1596		if (r_len > sizeof(int))
1597			r_len = sizeof(int);
1598		val = (scp->nonagle == TCP_NAGLE_OFF);
1599		r_data = &val;
1600		break;
1601
1602	case DSO_CORK:
1603		if (r_len > sizeof(int))
1604			r_len = sizeof(int);
1605		val = (scp->nonagle == TCP_NAGLE_CORK);
1606		r_data = &val;
1607		break;
1608
1609	case DSO_SERVICES:
1610		if (r_len > sizeof(unsigned char))
1611			r_len = sizeof(unsigned char);
1612		r_data = &scp->services_rem;
1613		break;
1614
1615	case DSO_INFO:
1616		if (r_len > sizeof(unsigned char))
1617			r_len = sizeof(unsigned char);
1618		r_data = &scp->info_rem;
1619		break;
1620
1621	case DSO_STREAM:
1622	case DSO_SEQPACKET:
1623	case DSO_CONACCEPT:
1624	case DSO_CONREJECT:
1625	default:
1626		return -ENOPROTOOPT;
1627	}
1628
1629	if (r_data) {
1630		if (copy_to_user(optval, r_data, r_len))
1631			return -EFAULT;
1632		if (put_user(r_len, optlen))
1633			return -EFAULT;
1634	}
1635
1636	return 0;
1637}
1638
1639
1640static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1641{
1642	struct sk_buff *skb;
1643	int len = 0;
1644
1645	if (flags & MSG_OOB)
1646		return !skb_queue_empty(q) ? 1 : 0;
1647
1648	skb_queue_walk(q, skb) {
1649		struct dn_skb_cb *cb = DN_SKB_CB(skb);
1650		len += skb->len;
1651
1652		if (cb->nsp_flags & 0x40) {
1653			/* SOCK_SEQPACKET reads to EOM */
1654			if (sk->sk_type == SOCK_SEQPACKET)
1655				return 1;
1656			/* so does SOCK_STREAM unless WAITALL is specified */
1657			if (!(flags & MSG_WAITALL))
1658				return 1;
1659		}
1660
1661		/* minimum data length for read exceeded */
1662		if (len >= target)
1663			return 1;
1664	}
1665
1666	return 0;
1667}
1668
1669
1670static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1671		      int flags)
1672{
1673	struct sock *sk = sock->sk;
1674	struct dn_scp *scp = DN_SK(sk);
1675	struct sk_buff_head *queue = &sk->sk_receive_queue;
1676	size_t target = size > 1 ? 1 : 0;
1677	size_t copied = 0;
1678	int rv = 0;
1679	struct sk_buff *skb, *n;
1680	struct dn_skb_cb *cb = NULL;
1681	unsigned char eor = 0;
1682	long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1683
1684	lock_sock(sk);
1685
1686	if (sock_flag(sk, SOCK_ZAPPED)) {
1687		rv = -EADDRNOTAVAIL;
1688		goto out;
1689	}
1690
1691	if (sk->sk_shutdown & RCV_SHUTDOWN) {
1692		rv = 0;
1693		goto out;
1694	}
1695
1696	rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1697	if (rv)
1698		goto out;
1699
1700	if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1701		rv = -EOPNOTSUPP;
1702		goto out;
1703	}
1704
1705	if (flags & MSG_OOB)
1706		queue = &scp->other_receive_queue;
1707
1708	if (flags & MSG_WAITALL)
1709		target = size;
1710
1711
1712	/*
1713	 * See if there is data ready to read, sleep if there isn't
1714	 */
1715	for(;;) {
1716		DEFINE_WAIT_FUNC(wait, woken_wake_function);
1717
1718		if (sk->sk_err)
1719			goto out;
1720
1721		if (!skb_queue_empty(&scp->other_receive_queue)) {
1722			if (!(flags & MSG_OOB)) {
1723				msg->msg_flags |= MSG_OOB;
1724				if (!scp->other_report) {
1725					scp->other_report = 1;
1726					goto out;
1727				}
1728			}
1729		}
1730
1731		if (scp->state != DN_RUN)
1732			goto out;
1733
1734		if (signal_pending(current)) {
1735			rv = sock_intr_errno(timeo);
1736			goto out;
1737		}
1738
1739		if (dn_data_ready(sk, queue, flags, target))
1740			break;
1741
1742		if (flags & MSG_DONTWAIT) {
1743			rv = -EWOULDBLOCK;
1744			goto out;
1745		}
1746
1747		add_wait_queue(sk_sleep(sk), &wait);
1748		sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1749		sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1750		sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1751		remove_wait_queue(sk_sleep(sk), &wait);
1752	}
1753
1754	skb_queue_walk_safe(queue, skb, n) {
1755		unsigned int chunk = skb->len;
1756		cb = DN_SKB_CB(skb);
1757
1758		if ((chunk + copied) > size)
1759			chunk = size - copied;
1760
1761		if (memcpy_to_msg(msg, skb->data, chunk)) {
1762			rv = -EFAULT;
1763			break;
1764		}
1765		copied += chunk;
1766
1767		if (!(flags & MSG_PEEK))
1768			skb_pull(skb, chunk);
1769
1770		eor = cb->nsp_flags & 0x40;
1771
1772		if (skb->len == 0) {
1773			skb_unlink(skb, queue);
1774			kfree_skb(skb);
1775			/*
1776			 * N.B. Don't refer to skb or cb after this point
1777			 * in loop.
1778			 */
1779			if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1780				scp->flowloc_sw = DN_SEND;
1781				dn_nsp_send_link(sk, DN_SEND, 0);
1782			}
1783		}
1784
1785		if (eor) {
1786			if (sk->sk_type == SOCK_SEQPACKET)
1787				break;
1788			if (!(flags & MSG_WAITALL))
1789				break;
1790		}
1791
1792		if (flags & MSG_OOB)
1793			break;
1794
1795		if (copied >= target)
1796			break;
1797	}
1798
1799	rv = copied;
1800
1801
1802	if (eor && (sk->sk_type == SOCK_SEQPACKET))
1803		msg->msg_flags |= MSG_EOR;
1804
1805out:
1806	if (rv == 0)
1807		rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1808
1809	if ((rv >= 0) && msg->msg_name) {
1810		__sockaddr_check_size(sizeof(struct sockaddr_dn));
1811		memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1812		msg->msg_namelen = sizeof(struct sockaddr_dn);
1813	}
1814
1815	release_sock(sk);
1816
1817	return rv;
1818}
1819
1820
1821static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1822{
1823	unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1824	if (skb_queue_len(queue) >= scp->snd_window)
1825		return 1;
1826	if (fctype != NSP_FC_NONE) {
1827		if (flags & MSG_OOB) {
1828			if (scp->flowrem_oth == 0)
1829				return 1;
1830		} else {
1831			if (scp->flowrem_dat == 0)
1832				return 1;
1833		}
1834	}
1835	return 0;
1836}
1837
1838/*
1839 * The DECnet spec requires that the "routing layer" accepts packets which
1840 * are at least 230 bytes in size. This excludes any headers which the NSP
1841 * layer might add, so we always assume that we'll be using the maximal
1842 * length header on data packets. The variation in length is due to the
1843 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1844 * make much practical difference.
1845 */
1846unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1847{
1848	unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1849	if (dev) {
1850		struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1851		mtu -= LL_RESERVED_SPACE(dev);
1852		if (dn_db->use_long)
1853			mtu -= 21;
1854		else
1855			mtu -= 6;
1856		mtu -= DN_MAX_NSP_DATA_HEADER;
1857	} else {
1858		/*
1859		 * 21 = long header, 16 = guess at MAC header length
1860		 */
1861		mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1862	}
1863	if (mtu > mss)
1864		mss = mtu;
1865	return mss;
1866}
1867
1868static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1869{
1870	struct dst_entry *dst = __sk_dst_get(sk);
1871	struct dn_scp *scp = DN_SK(sk);
1872	int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1873
1874	/* Other data messages are limited to 16 bytes per packet */
1875	if (flags & MSG_OOB)
1876		return 16;
1877
1878	/* This works out the maximum size of segment we can send out */
1879	if (dst) {
1880		u32 mtu = dst_mtu(dst);
1881		mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1882	}
1883
1884	return mss_now;
1885}
1886
1887/*
1888 * N.B. We get the timeout wrong here, but then we always did get it
1889 * wrong before and this is another step along the road to correcting
1890 * it. It ought to get updated each time we pass through the routine,
1891 * but in practise it probably doesn't matter too much for now.
1892 */
1893static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1894			      unsigned long datalen, int noblock,
1895			      int *errcode)
1896{
1897	struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1898						   noblock, errcode);
1899	if (skb) {
1900		skb->protocol = htons(ETH_P_DNA_RT);
1901		skb->pkt_type = PACKET_OUTGOING;
1902	}
1903	return skb;
1904}
1905
1906static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 
1907{
1908	struct sock *sk = sock->sk;
1909	struct dn_scp *scp = DN_SK(sk);
1910	size_t mss;
1911	struct sk_buff_head *queue = &scp->data_xmit_queue;
1912	int flags = msg->msg_flags;
1913	int err = 0;
1914	size_t sent = 0;
1915	int addr_len = msg->msg_namelen;
1916	DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1917	struct sk_buff *skb = NULL;
1918	struct dn_skb_cb *cb;
1919	size_t len;
1920	unsigned char fctype;
1921	long timeo;
1922
1923	if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1924		return -EOPNOTSUPP;
1925
1926	if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1927		return -EINVAL;
1928
1929	lock_sock(sk);
1930	timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1931	/*
1932	 * The only difference between stream sockets and sequenced packet
1933	 * sockets is that the stream sockets always behave as if MSG_EOR
1934	 * has been set.
1935	 */
1936	if (sock->type == SOCK_STREAM) {
1937		if (flags & MSG_EOR) {
1938			err = -EINVAL;
1939			goto out;
1940		}
1941		flags |= MSG_EOR;
1942	}
1943
1944
1945	err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1946	if (err)
1947		goto out_err;
1948
1949	if (sk->sk_shutdown & SEND_SHUTDOWN) {
1950		err = -EPIPE;
1951		if (!(flags & MSG_NOSIGNAL))
1952			send_sig(SIGPIPE, current, 0);
1953		goto out_err;
1954	}
1955
1956	if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1957		dst_negative_advice(sk);
1958
1959	mss = scp->segsize_rem;
1960	fctype = scp->services_rem & NSP_FC_MASK;
1961
1962	mss = dn_current_mss(sk, flags);
1963
1964	if (flags & MSG_OOB) {
1965		queue = &scp->other_xmit_queue;
1966		if (size > mss) {
1967			err = -EMSGSIZE;
1968			goto out;
1969		}
1970	}
1971
1972	scp->persist_fxn = dn_nsp_xmit_timeout;
1973
1974	while(sent < size) {
1975		err = sock_error(sk);
1976		if (err)
1977			goto out;
1978
1979		if (signal_pending(current)) {
1980			err = sock_intr_errno(timeo);
1981			goto out;
1982		}
1983
1984		/*
1985		 * Calculate size that we wish to send.
1986		 */
1987		len = size - sent;
1988
1989		if (len > mss)
1990			len = mss;
1991
1992		/*
1993		 * Wait for queue size to go down below the window
1994		 * size.
1995		 */
1996		if (dn_queue_too_long(scp, queue, flags)) {
1997			DEFINE_WAIT_FUNC(wait, woken_wake_function);
1998
1999			if (flags & MSG_DONTWAIT) {
2000				err = -EWOULDBLOCK;
2001				goto out;
2002			}
2003
2004			add_wait_queue(sk_sleep(sk), &wait);
2005			sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2006			sk_wait_event(sk, &timeo,
2007				      !dn_queue_too_long(scp, queue, flags), &wait);
2008			sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2009			remove_wait_queue(sk_sleep(sk), &wait);
2010			continue;
2011		}
2012
2013		/*
2014		 * Get a suitably sized skb.
2015		 * 64 is a bit of a hack really, but its larger than any
2016		 * link-layer headers and has served us well as a good
2017		 * guess as to their real length.
2018		 */
2019		skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2020					 flags & MSG_DONTWAIT, &err);
2021
2022		if (err)
2023			break;
2024
2025		if (!skb)
2026			continue;
2027
2028		cb = DN_SKB_CB(skb);
2029
2030		skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2031
2032		if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2033			err = -EFAULT;
2034			goto out;
2035		}
2036
2037		if (flags & MSG_OOB) {
2038			cb->nsp_flags = 0x30;
2039			if (fctype != NSP_FC_NONE)
2040				scp->flowrem_oth--;
2041		} else {
2042			cb->nsp_flags = 0x00;
2043			if (scp->seg_total == 0)
2044				cb->nsp_flags |= 0x20;
2045
2046			scp->seg_total += len;
2047
2048			if (((sent + len) == size) && (flags & MSG_EOR)) {
2049				cb->nsp_flags |= 0x40;
2050				scp->seg_total = 0;
2051				if (fctype == NSP_FC_SCMC)
2052					scp->flowrem_dat--;
2053			}
2054			if (fctype == NSP_FC_SRC)
2055				scp->flowrem_dat--;
2056		}
2057
2058		sent += len;
2059		dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2060		skb = NULL;
2061
2062		scp->persist = dn_nsp_persist(sk);
2063
2064	}
2065out:
2066
2067	kfree_skb(skb);
2068
2069	release_sock(sk);
2070
2071	return sent ? sent : err;
2072
2073out_err:
2074	err = sk_stream_error(sk, flags, err);
2075	release_sock(sk);
2076	return err;
2077}
2078
2079static int dn_device_event(struct notifier_block *this, unsigned long event,
2080			   void *ptr)
2081{
2082	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2083
2084	if (!net_eq(dev_net(dev), &init_net))
2085		return NOTIFY_DONE;
2086
2087	switch (event) {
2088	case NETDEV_UP:
2089		dn_dev_up(dev);
2090		break;
2091	case NETDEV_DOWN:
2092		dn_dev_down(dev);
2093		break;
2094	default:
2095		break;
2096	}
2097
2098	return NOTIFY_DONE;
2099}
2100
2101static struct notifier_block dn_dev_notifier = {
2102	.notifier_call = dn_device_event,
2103};
2104
2105static struct packet_type dn_dix_packet_type __read_mostly = {
2106	.type =		cpu_to_be16(ETH_P_DNA_RT),
2107	.func =		dn_route_rcv,
2108};
2109
2110#ifdef CONFIG_PROC_FS
2111struct dn_iter_state {
2112	int bucket;
2113};
2114
2115static struct sock *dn_socket_get_first(struct seq_file *seq)
2116{
2117	struct dn_iter_state *state = seq->private;
2118	struct sock *n = NULL;
2119
2120	for(state->bucket = 0;
2121	    state->bucket < DN_SK_HASH_SIZE;
2122	    ++state->bucket) {
2123		n = sk_head(&dn_sk_hash[state->bucket]);
2124		if (n)
2125			break;
2126	}
2127
2128	return n;
2129}
2130
2131static struct sock *dn_socket_get_next(struct seq_file *seq,
2132				       struct sock *n)
2133{
2134	struct dn_iter_state *state = seq->private;
2135
2136	n = sk_next(n);
2137	while (!n) {
2138		if (++state->bucket >= DN_SK_HASH_SIZE)
2139			break;
2140		n = sk_head(&dn_sk_hash[state->bucket]);
2141	}
 
 
 
2142	return n;
2143}
2144
2145static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2146{
2147	struct sock *sk = dn_socket_get_first(seq);
2148
2149	if (sk) {
2150		while(*pos && (sk = dn_socket_get_next(seq, sk)))
2151			--*pos;
2152	}
2153	return *pos ? NULL : sk;
2154}
2155
2156static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2157{
2158	void *rc;
2159	read_lock_bh(&dn_hash_lock);
2160	rc = socket_get_idx(seq, &pos);
2161	if (!rc) {
2162		read_unlock_bh(&dn_hash_lock);
2163	}
2164	return rc;
2165}
2166
2167static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2168{
2169	return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2170}
2171
2172static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2173{
2174	void *rc;
2175
2176	if (v == SEQ_START_TOKEN) {
2177		rc = dn_socket_get_idx(seq, 0);
2178		goto out;
2179	}
2180
2181	rc = dn_socket_get_next(seq, v);
2182	if (rc)
2183		goto out;
2184	read_unlock_bh(&dn_hash_lock);
2185out:
2186	++*pos;
2187	return rc;
2188}
2189
2190static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2191{
2192	if (v && v != SEQ_START_TOKEN)
2193		read_unlock_bh(&dn_hash_lock);
2194}
2195
2196#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2197
2198static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2199{
2200	int i;
2201
2202	switch (le16_to_cpu(dn->sdn_objnamel)) {
2203	case 0:
2204		sprintf(buf, "%d", dn->sdn_objnum);
2205		break;
2206	default:
2207		for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2208			buf[i] = dn->sdn_objname[i];
2209			if (IS_NOT_PRINTABLE(buf[i]))
2210				buf[i] = '.';
2211		}
2212		buf[i] = 0;
2213	}
2214}
2215
2216static char *dn_state2asc(unsigned char state)
2217{
2218	switch (state) {
2219	case DN_O:
2220		return "OPEN";
2221	case DN_CR:
2222		return "  CR";
2223	case DN_DR:
2224		return "  DR";
2225	case DN_DRC:
2226		return " DRC";
2227	case DN_CC:
2228		return "  CC";
2229	case DN_CI:
2230		return "  CI";
2231	case DN_NR:
2232		return "  NR";
2233	case DN_NC:
2234		return "  NC";
2235	case DN_CD:
2236		return "  CD";
2237	case DN_RJ:
2238		return "  RJ";
2239	case DN_RUN:
2240		return " RUN";
2241	case DN_DI:
2242		return "  DI";
2243	case DN_DIC:
2244		return " DIC";
2245	case DN_DN:
2246		return "  DN";
2247	case DN_CL:
2248		return "  CL";
2249	case DN_CN:
2250		return "  CN";
2251	}
2252
2253	return "????";
2254}
2255
2256static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2257{
2258	struct dn_scp *scp = DN_SK(sk);
2259	char buf1[DN_ASCBUF_LEN];
2260	char buf2[DN_ASCBUF_LEN];
2261	char local_object[DN_MAXOBJL+3];
2262	char remote_object[DN_MAXOBJL+3];
2263
2264	dn_printable_object(&scp->addr, local_object);
2265	dn_printable_object(&scp->peer, remote_object);
2266
2267	seq_printf(seq,
2268		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2269		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2270		   dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2271		   scp->addrloc,
2272		   scp->numdat,
2273		   scp->numoth,
2274		   scp->ackxmt_dat,
2275		   scp->ackxmt_oth,
2276		   scp->flowloc_sw,
2277		   local_object,
2278		   dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2279		   scp->addrrem,
2280		   scp->numdat_rcv,
2281		   scp->numoth_rcv,
2282		   scp->ackrcv_dat,
2283		   scp->ackrcv_oth,
2284		   scp->flowrem_sw,
2285		   remote_object,
2286		   dn_state2asc(scp->state),
2287		   ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2288}
2289
2290static int dn_socket_seq_show(struct seq_file *seq, void *v)
2291{
2292	if (v == SEQ_START_TOKEN) {
2293		seq_puts(seq, "Local                                              Remote\n");
2294	} else {
2295		dn_socket_format_entry(seq, v);
2296	}
2297	return 0;
2298}
2299
2300static const struct seq_operations dn_socket_seq_ops = {
2301	.start	= dn_socket_seq_start,
2302	.next	= dn_socket_seq_next,
2303	.stop	= dn_socket_seq_stop,
2304	.show	= dn_socket_seq_show,
2305};
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2306#endif
2307
2308static const struct net_proto_family	dn_family_ops = {
2309	.family =	AF_DECnet,
2310	.create =	dn_create,
2311	.owner	=	THIS_MODULE,
2312};
2313
2314static const struct proto_ops dn_proto_ops = {
2315	.family =	AF_DECnet,
2316	.owner =	THIS_MODULE,
2317	.release =	dn_release,
2318	.bind =		dn_bind,
2319	.connect =	dn_connect,
2320	.socketpair =	sock_no_socketpair,
2321	.accept =	dn_accept,
2322	.getname =	dn_getname,
2323	.poll =		dn_poll,
2324	.ioctl =	dn_ioctl,
2325	.listen =	dn_listen,
2326	.shutdown =	dn_shutdown,
2327	.setsockopt =	dn_setsockopt,
2328	.getsockopt =	dn_getsockopt,
2329	.sendmsg =	dn_sendmsg,
2330	.recvmsg =	dn_recvmsg,
2331	.mmap =		sock_no_mmap,
2332	.sendpage =	sock_no_sendpage,
2333};
2334
2335MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2336MODULE_AUTHOR("Linux DECnet Project Team");
2337MODULE_LICENSE("GPL");
2338MODULE_ALIAS_NETPROTO(PF_DECnet);
2339
2340static const char banner[] __initconst = KERN_INFO
2341"NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2342
2343static int __init decnet_init(void)
2344{
2345	int rc;
2346
2347	printk(banner);
2348
2349	rc = proto_register(&dn_proto, 1);
2350	if (rc != 0)
2351		goto out;
2352
2353	dn_neigh_init();
2354	dn_dev_init();
2355	dn_route_init();
2356	dn_fib_init();
2357
2358	sock_register(&dn_family_ops);
2359	dev_add_pack(&dn_dix_packet_type);
2360	register_netdevice_notifier(&dn_dev_notifier);
2361
2362	proc_create_seq_private("decnet", 0444, init_net.proc_net,
2363			&dn_socket_seq_ops, sizeof(struct dn_iter_state),
2364			NULL);
2365	dn_register_sysctl();
2366out:
2367	return rc;
2368
2369}
2370module_init(decnet_init);
2371
2372/*
2373 * Prevent DECnet module unloading until its fixed properly.
2374 * Requires an audit of the code to check for memory leaks and
2375 * initialisation problems etc.
2376 */
2377#if 0
2378static void __exit decnet_exit(void)
2379{
2380	sock_unregister(AF_DECnet);
2381	rtnl_unregister_all(PF_DECnet);
2382	dev_remove_pack(&dn_dix_packet_type);
2383
2384	dn_unregister_sysctl();
2385
2386	unregister_netdevice_notifier(&dn_dev_notifier);
2387
2388	dn_route_cleanup();
2389	dn_dev_cleanup();
2390	dn_neigh_cleanup();
2391	dn_fib_cleanup();
2392
2393	remove_proc_entry("decnet", init_net.proc_net);
2394
2395	proto_unregister(&dn_proto);
2396
2397	rcu_barrier(); /* Wait for completion of call_rcu()'s */
2398}
2399module_exit(decnet_exit);
2400#endif