1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  IUCV protocol stack for Linux on zSeries
   4 *
   5 *  Copyright IBM Corp. 2006, 2009
   6 *
   7 *  Author(s):	Jennifer Hunt <jenhunt@us.ibm.com>
   8 *		Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
   9 *  PM functions:
  10 *		Ursula Braun <ursula.braun@de.ibm.com>
  11 */
  12
  13#define KMSG_COMPONENT "af_iucv"
  14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  15
  16#include <linux/filter.h>
  17#include <linux/module.h>
  18#include <linux/netdevice.h>
  19#include <linux/types.h>
  20#include <linux/limits.h>
  21#include <linux/list.h>
  22#include <linux/errno.h>
  23#include <linux/kernel.h>
  24#include <linux/sched/signal.h>
  25#include <linux/slab.h>
  26#include <linux/skbuff.h>
  27#include <linux/init.h>
  28#include <linux/poll.h>
  29#include <linux/security.h>
  30#include <net/sock.h>
  31#include <asm/ebcdic.h>
  32#include <asm/cpcmd.h>
  33#include <linux/kmod.h>
  34
  35#include <net/iucv/af_iucv.h>
  36
  37#define VERSION "1.2"
  38
  39static char iucv_userid[80];
  40
 
 
  41static struct proto iucv_proto = {
  42	.name		= "AF_IUCV",
  43	.owner		= THIS_MODULE,
  44	.obj_size	= sizeof(struct iucv_sock),
  45};
  46
  47static struct iucv_interface *pr_iucv;
  48static struct iucv_handler af_iucv_handler;
  49
  50/* special AF_IUCV IPRM messages */
  51static const u8 iprm_shutdown[8] =
  52	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  53
  54#define TRGCLS_SIZE	sizeof_field(struct iucv_message, class)
  55
  56#define __iucv_sock_wait(sk, condition, timeo, ret)			\
  57do {									\
  58	DEFINE_WAIT(__wait);						\
  59	long __timeo = timeo;						\
  60	ret = 0;							\
  61	prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);	\
  62	while (!(condition)) {						\
  63		if (!__timeo) {						\
  64			ret = -EAGAIN;					\
  65			break;						\
  66		}							\
  67		if (signal_pending(current)) {				\
  68			ret = sock_intr_errno(__timeo);			\
  69			break;						\
  70		}							\
  71		release_sock(sk);					\
  72		__timeo = schedule_timeout(__timeo);			\
  73		lock_sock(sk);						\
  74		ret = sock_error(sk);					\
  75		if (ret)						\
  76			break;						\
  77	}								\
  78	finish_wait(sk_sleep(sk), &__wait);				\
  79} while (0)
  80
  81#define iucv_sock_wait(sk, condition, timeo)				\
  82({									\
  83	int __ret = 0;							\
  84	if (!(condition))						\
  85		__iucv_sock_wait(sk, condition, timeo, __ret);		\
  86	__ret;								\
  87})
  88
  89static struct sock *iucv_accept_dequeue(struct sock *parent,
  90					struct socket *newsock);
  91static void iucv_sock_kill(struct sock *sk);
  92static void iucv_sock_close(struct sock *sk);
 
  93
  94static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify);
 
 
 
 
 
 
 
 
 
 
 
 
  95
  96static struct iucv_sock_list iucv_sk_list = {
  97	.lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
  98	.autobind_name = ATOMIC_INIT(0)
  99};
 100
 
 
 
 
 
 
 
 
 
 101static inline void high_nmcpy(unsigned char *dst, char *src)
 102{
 103       memcpy(dst, src, 8);
 104}
 105
 106static inline void low_nmcpy(unsigned char *dst, char *src)
 107{
 108       memcpy(&dst[8], src, 8);
 109}
 110
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 111/**
 112 * iucv_msg_length() - Returns the length of an iucv message.
 113 * @msg:	Pointer to struct iucv_message, MUST NOT be NULL
 114 *
 115 * The function returns the length of the specified iucv message @msg of data
 116 * stored in a buffer and of data stored in the parameter list (PRMDATA).
 117 *
 118 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 119 * data:
 120 *	PRMDATA[0..6]	socket data (max 7 bytes);
 121 *	PRMDATA[7]	socket data length value (len is 0xff - PRMDATA[7])
 122 *
 123 * The socket data length is computed by subtracting the socket data length
 124 * value from 0xFF.
 125 * If the socket data len is greater 7, then PRMDATA can be used for special
 126 * notifications (see iucv_sock_shutdown); and further,
 127 * if the socket data len is > 7, the function returns 8.
 128 *
 129 * Use this function to allocate socket buffers to store iucv message data.
 130 */
 131static inline size_t iucv_msg_length(struct iucv_message *msg)
 132{
 133	size_t datalen;
 134
 135	if (msg->flags & IUCV_IPRMDATA) {
 136		datalen = 0xff - msg->rmmsg[7];
 137		return (datalen < 8) ? datalen : 8;
 138	}
 139	return msg->length;
 140}
 141
 142/**
 143 * iucv_sock_in_state() - check for specific states
 144 * @sk:		sock structure
 145 * @state:	first iucv sk state
 146 * @state2:	second iucv sk state
 147 *
 148 * Returns true if the socket in either in the first or second state.
 149 */
 150static int iucv_sock_in_state(struct sock *sk, int state, int state2)
 151{
 152	return (sk->sk_state == state || sk->sk_state == state2);
 153}
 154
 155/**
 156 * iucv_below_msglim() - function to check if messages can be sent
 157 * @sk:		sock structure
 158 *
 159 * Returns true if the send queue length is lower than the message limit.
 160 * Always returns true if the socket is not connected (no iucv path for
 161 * checking the message limit).
 162 */
 163static inline int iucv_below_msglim(struct sock *sk)
 164{
 165	struct iucv_sock *iucv = iucv_sk(sk);
 166
 167	if (sk->sk_state != IUCV_CONNECTED)
 168		return 1;
 169	if (iucv->transport == AF_IUCV_TRANS_IUCV)
 170		return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim);
 171	else
 172		return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
 173			(atomic_read(&iucv->pendings) <= 0));
 174}
 175
 176/*
 177 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
 178 */
 179static void iucv_sock_wake_msglim(struct sock *sk)
 180{
 181	struct socket_wq *wq;
 182
 183	rcu_read_lock();
 184	wq = rcu_dereference(sk->sk_wq);
 185	if (skwq_has_sleeper(wq))
 186		wake_up_interruptible_all(&wq->wait);
 187	sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
 188	rcu_read_unlock();
 189}
 190
 191/*
 192 * afiucv_hs_send() - send a message through HiperSockets transport
 193 */
 194static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
 195		   struct sk_buff *skb, u8 flags)
 196{
 197	struct iucv_sock *iucv = iucv_sk(sock);
 198	struct af_iucv_trans_hdr *phs_hdr;
 
 199	int err, confirm_recv = 0;
 200
 201	phs_hdr = skb_push(skb, sizeof(*phs_hdr));
 202	memset(phs_hdr, 0, sizeof(*phs_hdr));
 203	skb_reset_network_header(skb);
 204
 205	phs_hdr->magic = ETH_P_AF_IUCV;
 206	phs_hdr->version = 1;
 207	phs_hdr->flags = flags;
 208	if (flags == AF_IUCV_FLAG_SYN)
 209		phs_hdr->window = iucv->msglimit;
 210	else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
 211		confirm_recv = atomic_read(&iucv->msg_recv);
 212		phs_hdr->window = confirm_recv;
 213		if (confirm_recv)
 214			phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
 215	}
 216	memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
 217	memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
 218	memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
 219	memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
 220	ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
 221	ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
 222	ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
 223	ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
 224	if (imsg)
 225		memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
 226
 227	skb->dev = iucv->hs_dev;
 228	if (!skb->dev) {
 229		err = -ENODEV;
 230		goto err_free;
 231	}
 232
 233	dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
 234
 235	if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
 236		err = -ENETDOWN;
 237		goto err_free;
 238	}
 239	if (skb->len > skb->dev->mtu) {
 240		if (sock->sk_type == SOCK_SEQPACKET) {
 241			err = -EMSGSIZE;
 242			goto err_free;
 243		}
 244		err = pskb_trim(skb, skb->dev->mtu);
 245		if (err)
 246			goto err_free;
 247	}
 248	skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
 249
 250	atomic_inc(&iucv->skbs_in_xmit);
 
 
 
 
 
 
 
 251	err = dev_queue_xmit(skb);
 252	if (net_xmit_eval(err)) {
 253		atomic_dec(&iucv->skbs_in_xmit);
 
 254	} else {
 255		atomic_sub(confirm_recv, &iucv->msg_recv);
 256		WARN_ON(atomic_read(&iucv->msg_recv) < 0);
 257	}
 258	return net_xmit_eval(err);
 259
 260err_free:
 261	kfree_skb(skb);
 262	return err;
 263}
 264
 265static struct sock *__iucv_get_sock_by_name(char *nm)
 266{
 267	struct sock *sk;
 268
 269	sk_for_each(sk, &iucv_sk_list.head)
 270		if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 271			return sk;
 272
 273	return NULL;
 274}
 275
 276static void iucv_sock_destruct(struct sock *sk)
 277{
 278	skb_queue_purge(&sk->sk_receive_queue);
 279	skb_queue_purge(&sk->sk_error_queue);
 280
 
 
 281	if (!sock_flag(sk, SOCK_DEAD)) {
 282		pr_err("Attempt to release alive iucv socket %p\n", sk);
 283		return;
 284	}
 285
 286	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 287	WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 288	WARN_ON(sk->sk_wmem_queued);
 289	WARN_ON(sk->sk_forward_alloc);
 290}
 291
 292/* Cleanup Listen */
 293static void iucv_sock_cleanup_listen(struct sock *parent)
 294{
 295	struct sock *sk;
 296
 297	/* Close non-accepted connections */
 298	while ((sk = iucv_accept_dequeue(parent, NULL))) {
 299		iucv_sock_close(sk);
 300		iucv_sock_kill(sk);
 301	}
 302
 303	parent->sk_state = IUCV_CLOSED;
 304}
 305
 306static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 307{
 308	write_lock_bh(&l->lock);
 309	sk_add_node(sk, &l->head);
 310	write_unlock_bh(&l->lock);
 311}
 312
 313static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 314{
 315	write_lock_bh(&l->lock);
 316	sk_del_node_init(sk);
 317	write_unlock_bh(&l->lock);
 318}
 319
 320/* Kill socket (only if zapped and orphaned) */
 321static void iucv_sock_kill(struct sock *sk)
 322{
 323	if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 324		return;
 325
 326	iucv_sock_unlink(&iucv_sk_list, sk);
 327	sock_set_flag(sk, SOCK_DEAD);
 328	sock_put(sk);
 329}
 330
 331/* Terminate an IUCV path */
 332static void iucv_sever_path(struct sock *sk, int with_user_data)
 333{
 334	unsigned char user_data[16];
 335	struct iucv_sock *iucv = iucv_sk(sk);
 336	struct iucv_path *path = iucv->path;
 337
 338	/* Whoever resets the path pointer, must sever and free it. */
 339	if (xchg(&iucv->path, NULL)) {
 340		if (with_user_data) {
 341			low_nmcpy(user_data, iucv->src_name);
 342			high_nmcpy(user_data, iucv->dst_name);
 343			ASCEBC(user_data, sizeof(user_data));
 344			pr_iucv->path_sever(path, user_data);
 345		} else
 346			pr_iucv->path_sever(path, NULL);
 347		iucv_path_free(path);
 348	}
 349}
 350
 351/* Send controlling flags through an IUCV socket for HIPER transport */
 352static int iucv_send_ctrl(struct sock *sk, u8 flags)
 353{
 354	struct iucv_sock *iucv = iucv_sk(sk);
 355	int err = 0;
 356	int blen;
 357	struct sk_buff *skb;
 358	u8 shutdown = 0;
 359
 360	blen = sizeof(struct af_iucv_trans_hdr) +
 361	       LL_RESERVED_SPACE(iucv->hs_dev);
 362	if (sk->sk_shutdown & SEND_SHUTDOWN) {
 363		/* controlling flags should be sent anyway */
 364		shutdown = sk->sk_shutdown;
 365		sk->sk_shutdown &= RCV_SHUTDOWN;
 366	}
 367	skb = sock_alloc_send_skb(sk, blen, 1, &err);
 368	if (skb) {
 369		skb_reserve(skb, blen);
 370		err = afiucv_hs_send(NULL, sk, skb, flags);
 371	}
 372	if (shutdown)
 373		sk->sk_shutdown = shutdown;
 374	return err;
 375}
 376
 377/* Close an IUCV socket */
 378static void iucv_sock_close(struct sock *sk)
 379{
 380	struct iucv_sock *iucv = iucv_sk(sk);
 381	unsigned long timeo;
 382	int err = 0;
 383
 384	lock_sock(sk);
 385
 386	switch (sk->sk_state) {
 387	case IUCV_LISTEN:
 388		iucv_sock_cleanup_listen(sk);
 389		break;
 390
 391	case IUCV_CONNECTED:
 392		if (iucv->transport == AF_IUCV_TRANS_HIPER) {
 393			err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
 394			sk->sk_state = IUCV_DISCONN;
 395			sk->sk_state_change(sk);
 396		}
 397		fallthrough;
 398
 399	case IUCV_DISCONN:
 400		sk->sk_state = IUCV_CLOSING;
 401		sk->sk_state_change(sk);
 402
 403		if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) {
 404			if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 405				timeo = sk->sk_lingertime;
 406			else
 407				timeo = IUCV_DISCONN_TIMEOUT;
 408			iucv_sock_wait(sk,
 409					iucv_sock_in_state(sk, IUCV_CLOSED, 0),
 410					timeo);
 411		}
 412		fallthrough;
 413
 414	case IUCV_CLOSING:
 415		sk->sk_state = IUCV_CLOSED;
 416		sk->sk_state_change(sk);
 417
 418		sk->sk_err = ECONNRESET;
 419		sk->sk_state_change(sk);
 420
 421		skb_queue_purge(&iucv->send_skb_q);
 422		skb_queue_purge(&iucv->backlog_skb_q);
 423		fallthrough;
 424
 425	default:
 426		iucv_sever_path(sk, 1);
 427	}
 428
 429	if (iucv->hs_dev) {
 430		dev_put(iucv->hs_dev);
 431		iucv->hs_dev = NULL;
 432		sk->sk_bound_dev_if = 0;
 433	}
 434
 435	/* mark socket for deletion by iucv_sock_kill() */
 436	sock_set_flag(sk, SOCK_ZAPPED);
 437
 438	release_sock(sk);
 439}
 440
 441static void iucv_sock_init(struct sock *sk, struct sock *parent)
 442{
 443	if (parent) {
 444		sk->sk_type = parent->sk_type;
 445		security_sk_clone(parent, sk);
 446	}
 447}
 448
 449static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
 450{
 451	struct sock *sk;
 452	struct iucv_sock *iucv;
 453
 454	sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
 455	if (!sk)
 456		return NULL;
 457	iucv = iucv_sk(sk);
 458
 459	sock_init_data(sock, sk);
 460	INIT_LIST_HEAD(&iucv->accept_q);
 461	spin_lock_init(&iucv->accept_q_lock);
 462	skb_queue_head_init(&iucv->send_skb_q);
 463	INIT_LIST_HEAD(&iucv->message_q.list);
 464	spin_lock_init(&iucv->message_q.lock);
 465	skb_queue_head_init(&iucv->backlog_skb_q);
 466	iucv->send_tag = 0;
 467	atomic_set(&iucv->pendings, 0);
 468	iucv->flags = 0;
 469	iucv->msglimit = 0;
 470	atomic_set(&iucv->skbs_in_xmit, 0);
 471	atomic_set(&iucv->msg_sent, 0);
 472	atomic_set(&iucv->msg_recv, 0);
 473	iucv->path = NULL;
 474	iucv->sk_txnotify = afiucv_hs_callback_txnotify;
 475	memset(&iucv->init, 0, sizeof(iucv->init));
 476	if (pr_iucv)
 477		iucv->transport = AF_IUCV_TRANS_IUCV;
 478	else
 479		iucv->transport = AF_IUCV_TRANS_HIPER;
 480
 481	sk->sk_destruct = iucv_sock_destruct;
 482	sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 483
 484	sock_reset_flag(sk, SOCK_ZAPPED);
 485
 486	sk->sk_protocol = proto;
 487	sk->sk_state	= IUCV_OPEN;
 488
 489	iucv_sock_link(&iucv_sk_list, sk);
 490	return sk;
 491}
 492
 493static void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 494{
 495	unsigned long flags;
 496	struct iucv_sock *par = iucv_sk(parent);
 497
 498	sock_hold(sk);
 499	spin_lock_irqsave(&par->accept_q_lock, flags);
 500	list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 501	spin_unlock_irqrestore(&par->accept_q_lock, flags);
 502	iucv_sk(sk)->parent = parent;
 503	sk_acceptq_added(parent);
 504}
 505
 506static void iucv_accept_unlink(struct sock *sk)
 507{
 508	unsigned long flags;
 509	struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 510
 511	spin_lock_irqsave(&par->accept_q_lock, flags);
 512	list_del_init(&iucv_sk(sk)->accept_q);
 513	spin_unlock_irqrestore(&par->accept_q_lock, flags);
 514	sk_acceptq_removed(iucv_sk(sk)->parent);
 515	iucv_sk(sk)->parent = NULL;
 516	sock_put(sk);
 517}
 518
 519static struct sock *iucv_accept_dequeue(struct sock *parent,
 520					struct socket *newsock)
 521{
 522	struct iucv_sock *isk, *n;
 523	struct sock *sk;
 524
 525	list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 526		sk = (struct sock *) isk;
 527		lock_sock(sk);
 528
 529		if (sk->sk_state == IUCV_CLOSED) {
 530			iucv_accept_unlink(sk);
 531			release_sock(sk);
 532			continue;
 533		}
 534
 535		if (sk->sk_state == IUCV_CONNECTED ||
 536		    sk->sk_state == IUCV_DISCONN ||
 537		    !newsock) {
 538			iucv_accept_unlink(sk);
 539			if (newsock)
 540				sock_graft(sk, newsock);
 541
 542			release_sock(sk);
 543			return sk;
 544		}
 545
 546		release_sock(sk);
 547	}
 548	return NULL;
 549}
 550
 551static void __iucv_auto_name(struct iucv_sock *iucv)
 552{
 553	char name[12];
 554
 555	sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 556	while (__iucv_get_sock_by_name(name)) {
 557		sprintf(name, "%08x",
 558			atomic_inc_return(&iucv_sk_list.autobind_name));
 559	}
 560	memcpy(iucv->src_name, name, 8);
 561}
 562
 563/* Bind an unbound socket */
 564static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 565			  int addr_len)
 566{
 567	DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
 568	char uid[sizeof(sa->siucv_user_id)];
 569	struct sock *sk = sock->sk;
 570	struct iucv_sock *iucv;
 571	int err = 0;
 572	struct net_device *dev;
 
 573
 574	/* Verify the input sockaddr */
 575	if (addr_len < sizeof(struct sockaddr_iucv) ||
 576	    addr->sa_family != AF_IUCV)
 577		return -EINVAL;
 578
 579	lock_sock(sk);
 580	if (sk->sk_state != IUCV_OPEN) {
 581		err = -EBADFD;
 582		goto done;
 583	}
 584
 585	write_lock_bh(&iucv_sk_list.lock);
 586
 587	iucv = iucv_sk(sk);
 588	if (__iucv_get_sock_by_name(sa->siucv_name)) {
 589		err = -EADDRINUSE;
 590		goto done_unlock;
 591	}
 592	if (iucv->path)
 593		goto done_unlock;
 594
 595	/* Bind the socket */
 596	if (pr_iucv)
 597		if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
 598			goto vm_bind; /* VM IUCV transport */
 599
 600	/* try hiper transport */
 601	memcpy(uid, sa->siucv_user_id, sizeof(uid));
 602	ASCEBC(uid, 8);
 603	rcu_read_lock();
 604	for_each_netdev_rcu(&init_net, dev) {
 605		if (!memcmp(dev->perm_addr, uid, 8)) {
 606			memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
 607			/* Check for uninitialized siucv_name */
 608			if (strncmp(sa->siucv_name, "        ", 8) == 0)
 609				__iucv_auto_name(iucv);
 610			else
 611				memcpy(iucv->src_name, sa->siucv_name, 8);
 612			sk->sk_bound_dev_if = dev->ifindex;
 613			iucv->hs_dev = dev;
 614			dev_hold(dev);
 615			sk->sk_state = IUCV_BOUND;
 616			iucv->transport = AF_IUCV_TRANS_HIPER;
 617			if (!iucv->msglimit)
 618				iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
 619			rcu_read_unlock();
 620			goto done_unlock;
 621		}
 622	}
 623	rcu_read_unlock();
 624vm_bind:
 625	if (pr_iucv) {
 626		/* use local userid for backward compat */
 627		memcpy(iucv->src_name, sa->siucv_name, 8);
 628		memcpy(iucv->src_user_id, iucv_userid, 8);
 629		sk->sk_state = IUCV_BOUND;
 630		iucv->transport = AF_IUCV_TRANS_IUCV;
 631		sk->sk_allocation |= GFP_DMA;
 632		if (!iucv->msglimit)
 633			iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 634		goto done_unlock;
 635	}
 636	/* found no dev to bind */
 637	err = -ENODEV;
 638done_unlock:
 639	/* Release the socket list lock */
 640	write_unlock_bh(&iucv_sk_list.lock);
 641done:
 642	release_sock(sk);
 643	return err;
 644}
 645
 646/* Automatically bind an unbound socket */
 647static int iucv_sock_autobind(struct sock *sk)
 648{
 649	struct iucv_sock *iucv = iucv_sk(sk);
 650	int err = 0;
 651
 652	if (unlikely(!pr_iucv))
 653		return -EPROTO;
 654
 655	memcpy(iucv->src_user_id, iucv_userid, 8);
 656	iucv->transport = AF_IUCV_TRANS_IUCV;
 657	sk->sk_allocation |= GFP_DMA;
 658
 659	write_lock_bh(&iucv_sk_list.lock);
 660	__iucv_auto_name(iucv);
 661	write_unlock_bh(&iucv_sk_list.lock);
 662
 663	if (!iucv->msglimit)
 664		iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 665
 666	return err;
 667}
 668
 669static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
 670{
 671	DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
 672	struct sock *sk = sock->sk;
 673	struct iucv_sock *iucv = iucv_sk(sk);
 674	unsigned char user_data[16];
 675	int err;
 676
 677	high_nmcpy(user_data, sa->siucv_name);
 678	low_nmcpy(user_data, iucv->src_name);
 679	ASCEBC(user_data, sizeof(user_data));
 680
 681	/* Create path. */
 682	iucv->path = iucv_path_alloc(iucv->msglimit,
 683				     IUCV_IPRMDATA, GFP_KERNEL);
 684	if (!iucv->path) {
 685		err = -ENOMEM;
 686		goto done;
 687	}
 688	err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
 689				    sa->siucv_user_id, NULL, user_data,
 690				    sk);
 691	if (err) {
 692		iucv_path_free(iucv->path);
 693		iucv->path = NULL;
 694		switch (err) {
 695		case 0x0b:	/* Target communicator is not logged on */
 696			err = -ENETUNREACH;
 697			break;
 698		case 0x0d:	/* Max connections for this guest exceeded */
 699		case 0x0e:	/* Max connections for target guest exceeded */
 700			err = -EAGAIN;
 701			break;
 702		case 0x0f:	/* Missing IUCV authorization */
 703			err = -EACCES;
 704			break;
 705		default:
 706			err = -ECONNREFUSED;
 707			break;
 708		}
 709	}
 710done:
 711	return err;
 712}
 713
 714/* Connect an unconnected socket */
 715static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 716			     int alen, int flags)
 717{
 718	DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
 719	struct sock *sk = sock->sk;
 720	struct iucv_sock *iucv = iucv_sk(sk);
 721	int err;
 722
 723	if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
 724		return -EINVAL;
 725
 726	if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 727		return -EBADFD;
 728
 729	if (sk->sk_state == IUCV_OPEN &&
 730	    iucv->transport == AF_IUCV_TRANS_HIPER)
 731		return -EBADFD; /* explicit bind required */
 732
 733	if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 734		return -EINVAL;
 735
 736	if (sk->sk_state == IUCV_OPEN) {
 737		err = iucv_sock_autobind(sk);
 738		if (unlikely(err))
 739			return err;
 740	}
 741
 742	lock_sock(sk);
 743
 744	/* Set the destination information */
 745	memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
 746	memcpy(iucv->dst_name, sa->siucv_name, 8);
 747
 748	if (iucv->transport == AF_IUCV_TRANS_HIPER)
 749		err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
 750	else
 751		err = afiucv_path_connect(sock, addr);
 752	if (err)
 753		goto done;
 754
 755	if (sk->sk_state != IUCV_CONNECTED)
 756		err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
 757							    IUCV_DISCONN),
 758				     sock_sndtimeo(sk, flags & O_NONBLOCK));
 759
 760	if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
 761		err = -ECONNREFUSED;
 762
 763	if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
 764		iucv_sever_path(sk, 0);
 765
 766done:
 767	release_sock(sk);
 768	return err;
 769}
 770
 771/* Move a socket into listening state. */
 772static int iucv_sock_listen(struct socket *sock, int backlog)
 773{
 774	struct sock *sk = sock->sk;
 775	int err;
 776
 777	lock_sock(sk);
 778
 779	err = -EINVAL;
 780	if (sk->sk_state != IUCV_BOUND)
 781		goto done;
 782
 783	if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 784		goto done;
 785
 786	sk->sk_max_ack_backlog = backlog;
 787	sk->sk_ack_backlog = 0;
 788	sk->sk_state = IUCV_LISTEN;
 789	err = 0;
 790
 791done:
 792	release_sock(sk);
 793	return err;
 794}
 795
 796/* Accept a pending connection */
 797static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 798			    struct proto_accept_arg *arg)
 799{
 800	DECLARE_WAITQUEUE(wait, current);
 801	struct sock *sk = sock->sk, *nsk;
 802	long timeo;
 803	int err = 0;
 804
 805	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 806
 807	if (sk->sk_state != IUCV_LISTEN) {
 808		err = -EBADFD;
 809		goto done;
 810	}
 811
 812	timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
 813
 814	/* Wait for an incoming connection */
 815	add_wait_queue_exclusive(sk_sleep(sk), &wait);
 816	while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 817		set_current_state(TASK_INTERRUPTIBLE);
 818		if (!timeo) {
 819			err = -EAGAIN;
 820			break;
 821		}
 822
 823		release_sock(sk);
 824		timeo = schedule_timeout(timeo);
 825		lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 826
 827		if (sk->sk_state != IUCV_LISTEN) {
 828			err = -EBADFD;
 829			break;
 830		}
 831
 832		if (signal_pending(current)) {
 833			err = sock_intr_errno(timeo);
 834			break;
 835		}
 836	}
 837
 838	set_current_state(TASK_RUNNING);
 839	remove_wait_queue(sk_sleep(sk), &wait);
 840
 841	if (err)
 842		goto done;
 843
 844	newsock->state = SS_CONNECTED;
 845
 846done:
 847	release_sock(sk);
 848	return err;
 849}
 850
 851static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 852			     int peer)
 853{
 854	DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr);
 855	struct sock *sk = sock->sk;
 856	struct iucv_sock *iucv = iucv_sk(sk);
 857
 858	addr->sa_family = AF_IUCV;
 859
 860	if (peer) {
 861		memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
 862		memcpy(siucv->siucv_name, iucv->dst_name, 8);
 863	} else {
 864		memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
 865		memcpy(siucv->siucv_name, iucv->src_name, 8);
 866	}
 867	memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 868	memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
 869	memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
 870
 871	return sizeof(struct sockaddr_iucv);
 872}
 873
 874/**
 875 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
 876 * @path:	IUCV path
 877 * @msg:	Pointer to a struct iucv_message
 878 * @skb:	The socket data to send, skb->len MUST BE <= 7
 879 *
 880 * Send the socket data in the parameter list in the iucv message
 881 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
 882 * list and the socket data len at index 7 (last byte).
 883 * See also iucv_msg_length().
 884 *
 885 * Returns the error code from the iucv_message_send() call.
 886 */
 887static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
 888			  struct sk_buff *skb)
 889{
 890	u8 prmdata[8];
 891
 892	memcpy(prmdata, (void *) skb->data, skb->len);
 893	prmdata[7] = 0xff - (u8) skb->len;
 894	return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
 895				 (void *) prmdata, 8);
 896}
 897
 898static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 899			     size_t len)
 900{
 901	struct sock *sk = sock->sk;
 902	struct iucv_sock *iucv = iucv_sk(sk);
 903	size_t headroom = 0;
 904	size_t linear;
 905	struct sk_buff *skb;
 906	struct iucv_message txmsg = {0};
 907	struct cmsghdr *cmsg;
 908	int cmsg_done;
 909	long timeo;
 910	char user_id[9];
 911	char appl_id[9];
 912	int err;
 913	int noblock = msg->msg_flags & MSG_DONTWAIT;
 914
 915	err = sock_error(sk);
 916	if (err)
 917		return err;
 918
 919	if (msg->msg_flags & MSG_OOB)
 920		return -EOPNOTSUPP;
 921
 922	/* SOCK_SEQPACKET: we do not support segmented records */
 923	if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
 924		return -EOPNOTSUPP;
 925
 926	lock_sock(sk);
 927
 928	if (sk->sk_shutdown & SEND_SHUTDOWN) {
 929		err = -EPIPE;
 930		goto out;
 931	}
 932
 933	/* Return if the socket is not in connected state */
 934	if (sk->sk_state != IUCV_CONNECTED) {
 935		err = -ENOTCONN;
 936		goto out;
 937	}
 938
 939	/* initialize defaults */
 940	cmsg_done   = 0;	/* check for duplicate headers */
 
 941
 942	/* iterate over control messages */
 943	for_each_cmsghdr(cmsg, msg) {
 944		if (!CMSG_OK(msg, cmsg)) {
 945			err = -EINVAL;
 946			goto out;
 947		}
 948
 949		if (cmsg->cmsg_level != SOL_IUCV)
 950			continue;
 951
 952		if (cmsg->cmsg_type & cmsg_done) {
 953			err = -EINVAL;
 954			goto out;
 955		}
 956		cmsg_done |= cmsg->cmsg_type;
 957
 958		switch (cmsg->cmsg_type) {
 959		case SCM_IUCV_TRGCLS:
 960			if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
 961				err = -EINVAL;
 962				goto out;
 963			}
 964
 965			/* set iucv message target class */
 966			memcpy(&txmsg.class,
 967				(void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
 968
 969			break;
 970
 971		default:
 972			err = -EINVAL;
 973			goto out;
 974		}
 975	}
 976
 977	/* allocate one skb for each iucv message:
 978	 * this is fine for SOCK_SEQPACKET (unless we want to support
 979	 * segmented records using the MSG_EOR flag), but
 980	 * for SOCK_STREAM we might want to improve it in future */
 981	if (iucv->transport == AF_IUCV_TRANS_HIPER) {
 982		headroom = sizeof(struct af_iucv_trans_hdr) +
 983			   LL_RESERVED_SPACE(iucv->hs_dev);
 984		linear = min(len, PAGE_SIZE - headroom);
 985	} else {
 986		if (len < PAGE_SIZE) {
 987			linear = len;
 988		} else {
 989			/* In nonlinear "classic" iucv skb,
 990			 * reserve space for iucv_array
 991			 */
 992			headroom = sizeof(struct iucv_array) *
 993				   (MAX_SKB_FRAGS + 1);
 994			linear = PAGE_SIZE - headroom;
 995		}
 996	}
 997	skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
 998				   noblock, &err, 0);
 999	if (!skb)
1000		goto out;
1001	if (headroom)
1002		skb_reserve(skb, headroom);
1003	skb_put(skb, linear);
1004	skb->len = len;
1005	skb->data_len = len - linear;
1006	err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1007	if (err)
1008		goto fail;
1009
1010	/* wait if outstanding messages for iucv path has reached */
1011	timeo = sock_sndtimeo(sk, noblock);
1012	err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1013	if (err)
1014		goto fail;
1015
1016	/* return -ECONNRESET if the socket is no longer connected */
1017	if (sk->sk_state != IUCV_CONNECTED) {
1018		err = -ECONNRESET;
1019		goto fail;
1020	}
1021
1022	/* increment and save iucv message tag for msg_completion cbk */
1023	txmsg.tag = iucv->send_tag++;
1024	IUCV_SKB_CB(skb)->tag = txmsg.tag;
1025
1026	if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1027		atomic_inc(&iucv->msg_sent);
1028		err = afiucv_hs_send(&txmsg, sk, skb, 0);
1029		if (err) {
1030			atomic_dec(&iucv->msg_sent);
1031			goto out;
1032		}
1033	} else { /* Classic VM IUCV transport */
1034		skb_queue_tail(&iucv->send_skb_q, skb);
1035		atomic_inc(&iucv->skbs_in_xmit);
1036
1037		if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1038		    skb->len <= 7) {
1039			err = iucv_send_iprm(iucv->path, &txmsg, skb);
1040
1041			/* on success: there is no message_complete callback */
1042			/* for an IPRMDATA msg; remove skb from send queue   */
1043			if (err == 0) {
1044				atomic_dec(&iucv->skbs_in_xmit);
1045				skb_unlink(skb, &iucv->send_skb_q);
1046				consume_skb(skb);
1047			}
1048
1049			/* this error should never happen since the	*/
1050			/* IUCV_IPRMDATA path flag is set... sever path */
1051			if (err == 0x15) {
1052				pr_iucv->path_sever(iucv->path, NULL);
1053				atomic_dec(&iucv->skbs_in_xmit);
1054				skb_unlink(skb, &iucv->send_skb_q);
1055				err = -EPIPE;
1056				goto fail;
1057			}
1058		} else if (skb_is_nonlinear(skb)) {
1059			struct iucv_array *iba = (struct iucv_array *)skb->head;
1060			int i;
1061
1062			/* skip iucv_array lying in the headroom */
1063			iba[0].address = virt_to_dma32(skb->data);
1064			iba[0].length = (u32)skb_headlen(skb);
1065			for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1066				skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1067
1068				iba[i + 1].address = virt_to_dma32(skb_frag_address(frag));
 
1069				iba[i + 1].length = (u32)skb_frag_size(frag);
1070			}
1071			err = pr_iucv->message_send(iucv->path, &txmsg,
1072						    IUCV_IPBUFLST, 0,
1073						    (void *)iba, skb->len);
1074		} else { /* non-IPRM Linear skb */
1075			err = pr_iucv->message_send(iucv->path, &txmsg,
1076					0, 0, (void *)skb->data, skb->len);
1077		}
1078		if (err) {
1079			if (err == 3) {
1080				user_id[8] = 0;
1081				memcpy(user_id, iucv->dst_user_id, 8);
1082				appl_id[8] = 0;
1083				memcpy(appl_id, iucv->dst_name, 8);
1084				pr_err(
1085		"Application %s on z/VM guest %s exceeds message limit\n",
1086					appl_id, user_id);
1087				err = -EAGAIN;
1088			} else {
1089				err = -EPIPE;
1090			}
1091
1092			atomic_dec(&iucv->skbs_in_xmit);
1093			skb_unlink(skb, &iucv->send_skb_q);
1094			goto fail;
1095		}
1096	}
1097
1098	release_sock(sk);
1099	return len;
1100
1101fail:
1102	kfree_skb(skb);
1103out:
1104	release_sock(sk);
1105	return err;
1106}
1107
1108static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1109{
1110	size_t headroom, linear;
1111	struct sk_buff *skb;
1112	int err;
1113
1114	if (len < PAGE_SIZE) {
1115		headroom = 0;
1116		linear = len;
1117	} else {
1118		headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1119		linear = PAGE_SIZE - headroom;
1120	}
1121	skb = alloc_skb_with_frags(headroom + linear, len - linear,
1122				   0, &err, GFP_ATOMIC | GFP_DMA);
1123	WARN_ONCE(!skb,
1124		  "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1125		  len, err);
1126	if (skb) {
1127		if (headroom)
1128			skb_reserve(skb, headroom);
1129		skb_put(skb, linear);
1130		skb->len = len;
1131		skb->data_len = len - linear;
1132	}
1133	return skb;
1134}
1135
1136/* iucv_process_message() - Receive a single outstanding IUCV message
1137 *
1138 * Locking: must be called with message_q.lock held
1139 */
1140static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1141				 struct iucv_path *path,
1142				 struct iucv_message *msg)
1143{
1144	int rc;
1145	unsigned int len;
1146
1147	len = iucv_msg_length(msg);
1148
1149	/* store msg target class in the second 4 bytes of skb ctrl buffer */
1150	/* Note: the first 4 bytes are reserved for msg tag */
1151	IUCV_SKB_CB(skb)->class = msg->class;
1152
1153	/* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1154	if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1155		if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1156			skb->data = NULL;
1157			skb->len = 0;
1158		}
1159	} else {
1160		if (skb_is_nonlinear(skb)) {
1161			struct iucv_array *iba = (struct iucv_array *)skb->head;
1162			int i;
1163
1164			iba[0].address = virt_to_dma32(skb->data);
1165			iba[0].length = (u32)skb_headlen(skb);
1166			for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1167				skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1168
1169				iba[i + 1].address = virt_to_dma32(skb_frag_address(frag));
 
1170				iba[i + 1].length = (u32)skb_frag_size(frag);
1171			}
1172			rc = pr_iucv->message_receive(path, msg,
1173					      IUCV_IPBUFLST,
1174					      (void *)iba, len, NULL);
1175		} else {
1176			rc = pr_iucv->message_receive(path, msg,
1177					      msg->flags & IUCV_IPRMDATA,
1178					      skb->data, len, NULL);
1179		}
1180		if (rc) {
1181			kfree_skb(skb);
1182			return;
1183		}
1184		WARN_ON_ONCE(skb->len != len);
1185	}
1186
1187	IUCV_SKB_CB(skb)->offset = 0;
1188	if (sk_filter(sk, skb)) {
1189		atomic_inc(&sk->sk_drops);	/* skb rejected by filter */
1190		kfree_skb(skb);
1191		return;
1192	}
1193	if (__sock_queue_rcv_skb(sk, skb))	/* handle rcv queue full */
1194		skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1195}
1196
1197/* iucv_process_message_q() - Process outstanding IUCV messages
1198 *
1199 * Locking: must be called with message_q.lock held
1200 */
1201static void iucv_process_message_q(struct sock *sk)
1202{
1203	struct iucv_sock *iucv = iucv_sk(sk);
1204	struct sk_buff *skb;
1205	struct sock_msg_q *p, *n;
1206
1207	list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1208		skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1209		if (!skb)
1210			break;
1211		iucv_process_message(sk, skb, p->path, &p->msg);
1212		list_del(&p->list);
1213		kfree(p);
1214		if (!skb_queue_empty(&iucv->backlog_skb_q))
1215			break;
1216	}
1217}
1218
1219static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1220			     size_t len, int flags)
1221{
 
1222	struct sock *sk = sock->sk;
1223	struct iucv_sock *iucv = iucv_sk(sk);
1224	unsigned int copied, rlen;
1225	struct sk_buff *skb, *rskb, *cskb;
1226	int err = 0;
1227	u32 offset;
1228
1229	if ((sk->sk_state == IUCV_DISCONN) &&
1230	    skb_queue_empty(&iucv->backlog_skb_q) &&
1231	    skb_queue_empty(&sk->sk_receive_queue) &&
1232	    list_empty(&iucv->message_q.list))
1233		return 0;
1234
1235	if (flags & (MSG_OOB))
1236		return -EOPNOTSUPP;
1237
1238	/* receive/dequeue next skb:
1239	 * the function understands MSG_PEEK and, thus, does not dequeue skb
1240	 * only refcount is increased.
1241	 */
1242	skb = skb_recv_datagram(sk, flags, &err);
1243	if (!skb) {
1244		if (sk->sk_shutdown & RCV_SHUTDOWN)
1245			return 0;
1246		return err;
1247	}
1248
1249	offset = IUCV_SKB_CB(skb)->offset;
1250	rlen   = skb->len - offset;		/* real length of skb */
1251	copied = min_t(unsigned int, rlen, len);
1252	if (!rlen)
1253		sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1254
1255	cskb = skb;
1256	if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1257		err = -EFAULT;
1258		goto err_out;
 
1259	}
1260
1261	/* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1262	if (sk->sk_type == SOCK_SEQPACKET) {
1263		if (copied < rlen)
1264			msg->msg_flags |= MSG_TRUNC;
1265		/* each iucv message contains a complete record */
1266		msg->msg_flags |= MSG_EOR;
1267	}
1268
1269	/* create control message to store iucv msg target class:
1270	 * get the trgcls from the control buffer of the skb due to
1271	 * fragmentation of original iucv message. */
1272	err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1273		       sizeof(IUCV_SKB_CB(skb)->class),
1274		       (void *)&IUCV_SKB_CB(skb)->class);
1275	if (err)
1276		goto err_out;
 
 
 
1277
1278	/* Mark read part of skb as used */
1279	if (!(flags & MSG_PEEK)) {
1280
1281		/* SOCK_STREAM: re-queue skb if it contains unreceived data */
1282		if (sk->sk_type == SOCK_STREAM) {
1283			if (copied < rlen) {
1284				IUCV_SKB_CB(skb)->offset = offset + copied;
1285				skb_queue_head(&sk->sk_receive_queue, skb);
1286				goto done;
1287			}
1288		}
1289
1290		consume_skb(skb);
1291		if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1292			atomic_inc(&iucv->msg_recv);
1293			if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1294				WARN_ON(1);
1295				iucv_sock_close(sk);
1296				return -EFAULT;
1297			}
1298		}
1299
1300		/* Queue backlog skbs */
1301		spin_lock_bh(&iucv->message_q.lock);
1302		rskb = skb_dequeue(&iucv->backlog_skb_q);
1303		while (rskb) {
1304			IUCV_SKB_CB(rskb)->offset = 0;
1305			if (__sock_queue_rcv_skb(sk, rskb)) {
1306				/* handle rcv queue full */
1307				skb_queue_head(&iucv->backlog_skb_q,
1308						rskb);
1309				break;
1310			}
1311			rskb = skb_dequeue(&iucv->backlog_skb_q);
1312		}
1313		if (skb_queue_empty(&iucv->backlog_skb_q)) {
1314			if (!list_empty(&iucv->message_q.list))
1315				iucv_process_message_q(sk);
1316			if (atomic_read(&iucv->msg_recv) >=
1317							iucv->msglimit / 2) {
1318				err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1319				if (err) {
1320					sk->sk_state = IUCV_DISCONN;
1321					sk->sk_state_change(sk);
1322				}
1323			}
1324		}
1325		spin_unlock_bh(&iucv->message_q.lock);
1326	}
1327
1328done:
1329	/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1330	if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1331		copied = rlen;
1332	if (flags & MSG_PEEK)
1333		skb_unref(skb);
1334
1335	return copied;
1336
1337err_out:
1338	if (!(flags & MSG_PEEK))
1339		skb_queue_head(&sk->sk_receive_queue, skb);
1340	else
1341		skb_unref(skb);
1342
1343	return err;
1344}
1345
1346static inline __poll_t iucv_accept_poll(struct sock *parent)
1347{
1348	struct iucv_sock *isk, *n;
1349	struct sock *sk;
1350
1351	list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1352		sk = (struct sock *) isk;
1353
1354		if (sk->sk_state == IUCV_CONNECTED)
1355			return EPOLLIN | EPOLLRDNORM;
1356	}
1357
1358	return 0;
1359}
1360
1361static __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1362			       poll_table *wait)
1363{
1364	struct sock *sk = sock->sk;
1365	__poll_t mask = 0;
1366
1367	sock_poll_wait(file, sock, wait);
1368
1369	if (sk->sk_state == IUCV_LISTEN)
1370		return iucv_accept_poll(sk);
1371
1372	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1373		mask |= EPOLLERR |
1374			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1375
1376	if (sk->sk_shutdown & RCV_SHUTDOWN)
1377		mask |= EPOLLRDHUP;
1378
1379	if (sk->sk_shutdown == SHUTDOWN_MASK)
1380		mask |= EPOLLHUP;
1381
1382	if (!skb_queue_empty(&sk->sk_receive_queue) ||
1383	    (sk->sk_shutdown & RCV_SHUTDOWN))
1384		mask |= EPOLLIN | EPOLLRDNORM;
1385
1386	if (sk->sk_state == IUCV_CLOSED)
1387		mask |= EPOLLHUP;
1388
1389	if (sk->sk_state == IUCV_DISCONN)
1390		mask |= EPOLLIN;
1391
1392	if (sock_writeable(sk) && iucv_below_msglim(sk))
1393		mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1394	else
1395		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1396
1397	return mask;
1398}
1399
1400static int iucv_sock_shutdown(struct socket *sock, int how)
1401{
1402	struct sock *sk = sock->sk;
1403	struct iucv_sock *iucv = iucv_sk(sk);
1404	struct iucv_message txmsg;
1405	int err = 0;
1406
1407	how++;
1408
1409	if ((how & ~SHUTDOWN_MASK) || !how)
1410		return -EINVAL;
1411
1412	lock_sock(sk);
1413	switch (sk->sk_state) {
1414	case IUCV_LISTEN:
1415	case IUCV_DISCONN:
1416	case IUCV_CLOSING:
1417	case IUCV_CLOSED:
1418		err = -ENOTCONN;
1419		goto fail;
1420	default:
1421		break;
1422	}
1423
1424	if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) &&
1425	    sk->sk_state == IUCV_CONNECTED) {
1426		if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1427			txmsg.class = 0;
1428			txmsg.tag = 0;
1429			err = pr_iucv->message_send(iucv->path, &txmsg,
1430				IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1431			if (err) {
1432				switch (err) {
1433				case 1:
1434					err = -ENOTCONN;
1435					break;
1436				case 2:
1437					err = -ECONNRESET;
1438					break;
1439				default:
1440					err = -ENOTCONN;
1441					break;
1442				}
1443			}
1444		} else
1445			iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1446	}
1447
1448	sk->sk_shutdown |= how;
1449	if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1450		if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1451		    iucv->path) {
1452			err = pr_iucv->path_quiesce(iucv->path, NULL);
1453			if (err)
1454				err = -ENOTCONN;
1455/*			skb_queue_purge(&sk->sk_receive_queue); */
1456		}
1457		skb_queue_purge(&sk->sk_receive_queue);
1458	}
1459
1460	/* Wake up anyone sleeping in poll */
1461	sk->sk_state_change(sk);
1462
1463fail:
1464	release_sock(sk);
1465	return err;
1466}
1467
1468static int iucv_sock_release(struct socket *sock)
1469{
1470	struct sock *sk = sock->sk;
1471	int err = 0;
1472
1473	if (!sk)
1474		return 0;
1475
1476	iucv_sock_close(sk);
1477
1478	sock_orphan(sk);
1479	iucv_sock_kill(sk);
1480	return err;
1481}
1482
1483/* getsockopt and setsockopt */
1484static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1485				sockptr_t optval, unsigned int optlen)
1486{
1487	struct sock *sk = sock->sk;
1488	struct iucv_sock *iucv = iucv_sk(sk);
1489	int val;
1490	int rc;
1491
1492	if (level != SOL_IUCV)
1493		return -ENOPROTOOPT;
1494
1495	if (optlen < sizeof(int))
1496		return -EINVAL;
1497
1498	if (copy_from_sockptr(&val, optval, sizeof(int)))
1499		return -EFAULT;
1500
1501	rc = 0;
1502
1503	lock_sock(sk);
1504	switch (optname) {
1505	case SO_IPRMDATA_MSG:
1506		if (val)
1507			iucv->flags |= IUCV_IPRMDATA;
1508		else
1509			iucv->flags &= ~IUCV_IPRMDATA;
1510		break;
1511	case SO_MSGLIMIT:
1512		switch (sk->sk_state) {
1513		case IUCV_OPEN:
1514		case IUCV_BOUND:
1515			if (val < 1 || val > U16_MAX)
1516				rc = -EINVAL;
1517			else
1518				iucv->msglimit = val;
1519			break;
1520		default:
1521			rc = -EINVAL;
1522			break;
1523		}
1524		break;
1525	default:
1526		rc = -ENOPROTOOPT;
1527		break;
1528	}
1529	release_sock(sk);
1530
1531	return rc;
1532}
1533
1534static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1535				char __user *optval, int __user *optlen)
1536{
1537	struct sock *sk = sock->sk;
1538	struct iucv_sock *iucv = iucv_sk(sk);
1539	unsigned int val;
1540	int len;
1541
1542	if (level != SOL_IUCV)
1543		return -ENOPROTOOPT;
1544
1545	if (get_user(len, optlen))
1546		return -EFAULT;
1547
1548	if (len < 0)
1549		return -EINVAL;
1550
1551	len = min_t(unsigned int, len, sizeof(int));
1552
1553	switch (optname) {
1554	case SO_IPRMDATA_MSG:
1555		val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1556		break;
1557	case SO_MSGLIMIT:
1558		lock_sock(sk);
1559		val = (iucv->path != NULL) ? iucv->path->msglim	/* connected */
1560					   : iucv->msglimit;	/* default */
1561		release_sock(sk);
1562		break;
1563	case SO_MSGSIZE:
1564		if (sk->sk_state == IUCV_OPEN)
1565			return -EBADFD;
1566		val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1567				sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1568				0x7fffffff;
1569		break;
1570	default:
1571		return -ENOPROTOOPT;
1572	}
1573
1574	if (put_user(len, optlen))
1575		return -EFAULT;
1576	if (copy_to_user(optval, &val, len))
1577		return -EFAULT;
1578
1579	return 0;
1580}
1581
1582
1583/* Callback wrappers - called from iucv base support */
1584static int iucv_callback_connreq(struct iucv_path *path,
1585				 u8 ipvmid[8], u8 ipuser[16])
1586{
1587	unsigned char user_data[16];
1588	unsigned char nuser_data[16];
1589	unsigned char src_name[8];
1590	struct sock *sk, *nsk;
1591	struct iucv_sock *iucv, *niucv;
1592	int err;
1593
1594	memcpy(src_name, ipuser, 8);
1595	EBCASC(src_name, 8);
1596	/* Find out if this path belongs to af_iucv. */
1597	read_lock(&iucv_sk_list.lock);
1598	iucv = NULL;
1599	sk = NULL;
1600	sk_for_each(sk, &iucv_sk_list.head)
1601		if (sk->sk_state == IUCV_LISTEN &&
1602		    !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1603			/*
1604			 * Found a listening socket with
1605			 * src_name == ipuser[0-7].
1606			 */
1607			iucv = iucv_sk(sk);
1608			break;
1609		}
1610	read_unlock(&iucv_sk_list.lock);
1611	if (!iucv)
1612		/* No socket found, not one of our paths. */
1613		return -EINVAL;
1614
1615	bh_lock_sock(sk);
1616
1617	/* Check if parent socket is listening */
1618	low_nmcpy(user_data, iucv->src_name);
1619	high_nmcpy(user_data, iucv->dst_name);
1620	ASCEBC(user_data, sizeof(user_data));
1621	if (sk->sk_state != IUCV_LISTEN) {
1622		err = pr_iucv->path_sever(path, user_data);
1623		iucv_path_free(path);
1624		goto fail;
1625	}
1626
1627	/* Check for backlog size */
1628	if (sk_acceptq_is_full(sk)) {
1629		err = pr_iucv->path_sever(path, user_data);
1630		iucv_path_free(path);
1631		goto fail;
1632	}
1633
1634	/* Create the new socket */
1635	nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1636	if (!nsk) {
1637		err = pr_iucv->path_sever(path, user_data);
1638		iucv_path_free(path);
1639		goto fail;
1640	}
1641
1642	niucv = iucv_sk(nsk);
1643	iucv_sock_init(nsk, sk);
1644	niucv->transport = AF_IUCV_TRANS_IUCV;
1645	nsk->sk_allocation |= GFP_DMA;
1646
1647	/* Set the new iucv_sock */
1648	memcpy(niucv->dst_name, ipuser + 8, 8);
1649	EBCASC(niucv->dst_name, 8);
1650	memcpy(niucv->dst_user_id, ipvmid, 8);
1651	memcpy(niucv->src_name, iucv->src_name, 8);
1652	memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1653	niucv->path = path;
1654
1655	/* Call iucv_accept */
1656	high_nmcpy(nuser_data, ipuser + 8);
1657	memcpy(nuser_data + 8, niucv->src_name, 8);
1658	ASCEBC(nuser_data + 8, 8);
1659
1660	/* set message limit for path based on msglimit of accepting socket */
1661	niucv->msglimit = iucv->msglimit;
1662	path->msglim = iucv->msglimit;
1663	err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1664	if (err) {
1665		iucv_sever_path(nsk, 1);
1666		iucv_sock_kill(nsk);
1667		goto fail;
1668	}
1669
1670	iucv_accept_enqueue(sk, nsk);
1671
1672	/* Wake up accept */
1673	nsk->sk_state = IUCV_CONNECTED;
1674	sk->sk_data_ready(sk);
1675	err = 0;
1676fail:
1677	bh_unlock_sock(sk);
1678	return 0;
1679}
1680
1681static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1682{
1683	struct sock *sk = path->private;
1684
1685	sk->sk_state = IUCV_CONNECTED;
1686	sk->sk_state_change(sk);
1687}
1688
1689static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1690{
1691	struct sock *sk = path->private;
1692	struct iucv_sock *iucv = iucv_sk(sk);
1693	struct sk_buff *skb;
1694	struct sock_msg_q *save_msg;
1695	int len;
1696
1697	if (sk->sk_shutdown & RCV_SHUTDOWN) {
1698		pr_iucv->message_reject(path, msg);
1699		return;
1700	}
1701
1702	spin_lock(&iucv->message_q.lock);
1703
1704	if (!list_empty(&iucv->message_q.list) ||
1705	    !skb_queue_empty(&iucv->backlog_skb_q))
1706		goto save_message;
1707
1708	len = atomic_read(&sk->sk_rmem_alloc);
1709	len += SKB_TRUESIZE(iucv_msg_length(msg));
1710	if (len > sk->sk_rcvbuf)
1711		goto save_message;
1712
1713	skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1714	if (!skb)
1715		goto save_message;
1716
1717	iucv_process_message(sk, skb, path, msg);
1718	goto out_unlock;
1719
1720save_message:
1721	save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1722	if (!save_msg)
1723		goto out_unlock;
1724	save_msg->path = path;
1725	save_msg->msg = *msg;
1726
1727	list_add_tail(&save_msg->list, &iucv->message_q.list);
1728
1729out_unlock:
1730	spin_unlock(&iucv->message_q.lock);
1731}
1732
1733static void iucv_callback_txdone(struct iucv_path *path,
1734				 struct iucv_message *msg)
1735{
1736	struct sock *sk = path->private;
1737	struct sk_buff *this = NULL;
1738	struct sk_buff_head *list;
1739	struct sk_buff *list_skb;
1740	struct iucv_sock *iucv;
1741	unsigned long flags;
1742
1743	iucv = iucv_sk(sk);
1744	list = &iucv->send_skb_q;
1745
1746	bh_lock_sock(sk);
1747
1748	spin_lock_irqsave(&list->lock, flags);
1749	skb_queue_walk(list, list_skb) {
1750		if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1751			this = list_skb;
1752			break;
1753		}
1754	}
1755	if (this) {
1756		atomic_dec(&iucv->skbs_in_xmit);
1757		__skb_unlink(this, list);
1758	}
1759
1760	spin_unlock_irqrestore(&list->lock, flags);
1761
1762	if (this) {
1763		consume_skb(this);
1764		/* wake up any process waiting for sending */
1765		iucv_sock_wake_msglim(sk);
1766	}
1767
1768	if (sk->sk_state == IUCV_CLOSING) {
1769		if (atomic_read(&iucv->skbs_in_xmit) == 0) {
1770			sk->sk_state = IUCV_CLOSED;
1771			sk->sk_state_change(sk);
1772		}
1773	}
1774	bh_unlock_sock(sk);
1775
1776}
1777
1778static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1779{
1780	struct sock *sk = path->private;
1781
1782	if (sk->sk_state == IUCV_CLOSED)
1783		return;
1784
1785	bh_lock_sock(sk);
1786	iucv_sever_path(sk, 1);
1787	sk->sk_state = IUCV_DISCONN;
1788
1789	sk->sk_state_change(sk);
1790	bh_unlock_sock(sk);
1791}
1792
1793/* called if the other communication side shuts down its RECV direction;
1794 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1795 */
1796static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1797{
1798	struct sock *sk = path->private;
1799
1800	bh_lock_sock(sk);
1801	if (sk->sk_state != IUCV_CLOSED) {
1802		sk->sk_shutdown |= SEND_SHUTDOWN;
1803		sk->sk_state_change(sk);
1804	}
1805	bh_unlock_sock(sk);
1806}
1807
1808static struct iucv_handler af_iucv_handler = {
1809	.path_pending		= iucv_callback_connreq,
1810	.path_complete		= iucv_callback_connack,
1811	.path_severed		= iucv_callback_connrej,
1812	.message_pending	= iucv_callback_rx,
1813	.message_complete	= iucv_callback_txdone,
1814	.path_quiesced		= iucv_callback_shutdown,
1815};
1816
1817/***************** HiperSockets transport callbacks ********************/
1818static void afiucv_swap_src_dest(struct sk_buff *skb)
1819{
1820	struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1821	char tmpID[8];
1822	char tmpName[8];
1823
1824	ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1825	ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1826	ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1827	ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1828	memcpy(tmpID, trans_hdr->srcUserID, 8);
1829	memcpy(tmpName, trans_hdr->srcAppName, 8);
1830	memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1831	memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1832	memcpy(trans_hdr->destUserID, tmpID, 8);
1833	memcpy(trans_hdr->destAppName, tmpName, 8);
1834	skb_push(skb, ETH_HLEN);
1835	memset(skb->data, 0, ETH_HLEN);
1836}
1837
1838/*
1839 * afiucv_hs_callback_syn - react on received SYN
1840 */
1841static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1842{
1843	struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1844	struct sock *nsk;
1845	struct iucv_sock *iucv, *niucv;
1846	int err;
1847
1848	iucv = iucv_sk(sk);
1849	if (!iucv) {
1850		/* no sock - connection refused */
1851		afiucv_swap_src_dest(skb);
1852		trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1853		err = dev_queue_xmit(skb);
1854		goto out;
1855	}
1856
1857	nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1858	bh_lock_sock(sk);
1859	if ((sk->sk_state != IUCV_LISTEN) ||
1860	    sk_acceptq_is_full(sk) ||
1861	    !nsk) {
1862		/* error on server socket - connection refused */
1863		afiucv_swap_src_dest(skb);
1864		trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1865		err = dev_queue_xmit(skb);
1866		iucv_sock_kill(nsk);
1867		bh_unlock_sock(sk);
1868		goto out;
1869	}
1870
1871	niucv = iucv_sk(nsk);
1872	iucv_sock_init(nsk, sk);
1873	niucv->transport = AF_IUCV_TRANS_HIPER;
1874	niucv->msglimit = iucv->msglimit;
1875	if (!trans_hdr->window)
1876		niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1877	else
1878		niucv->msglimit_peer = trans_hdr->window;
1879	memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1880	memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1881	memcpy(niucv->src_name, iucv->src_name, 8);
1882	memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1883	nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1884	niucv->hs_dev = iucv->hs_dev;
1885	dev_hold(niucv->hs_dev);
1886	afiucv_swap_src_dest(skb);
1887	trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1888	trans_hdr->window = niucv->msglimit;
1889	/* if receiver acks the xmit connection is established */
1890	err = dev_queue_xmit(skb);
1891	if (!err) {
1892		iucv_accept_enqueue(sk, nsk);
1893		nsk->sk_state = IUCV_CONNECTED;
1894		sk->sk_data_ready(sk);
1895	} else
1896		iucv_sock_kill(nsk);
1897	bh_unlock_sock(sk);
1898
1899out:
1900	return NET_RX_SUCCESS;
1901}
1902
1903/*
1904 * afiucv_hs_callback_synack() - react on received SYN-ACK
1905 */
1906static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1907{
1908	struct iucv_sock *iucv = iucv_sk(sk);
1909
1910	if (!iucv || sk->sk_state != IUCV_BOUND) {
1911		kfree_skb(skb);
1912		return NET_RX_SUCCESS;
1913	}
1914
1915	bh_lock_sock(sk);
1916	iucv->msglimit_peer = iucv_trans_hdr(skb)->window;
1917	sk->sk_state = IUCV_CONNECTED;
1918	sk->sk_state_change(sk);
1919	bh_unlock_sock(sk);
1920	consume_skb(skb);
 
1921	return NET_RX_SUCCESS;
1922}
1923
1924/*
1925 * afiucv_hs_callback_synfin() - react on received SYN_FIN
1926 */
1927static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
1928{
1929	struct iucv_sock *iucv = iucv_sk(sk);
1930
1931	if (!iucv || sk->sk_state != IUCV_BOUND) {
1932		kfree_skb(skb);
1933		return NET_RX_SUCCESS;
1934	}
1935
1936	bh_lock_sock(sk);
1937	sk->sk_state = IUCV_DISCONN;
1938	sk->sk_state_change(sk);
1939	bh_unlock_sock(sk);
1940	consume_skb(skb);
 
1941	return NET_RX_SUCCESS;
1942}
1943
1944/*
1945 * afiucv_hs_callback_fin() - react on received FIN
1946 */
1947static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
1948{
1949	struct iucv_sock *iucv = iucv_sk(sk);
1950
1951	/* other end of connection closed */
1952	if (!iucv) {
1953		kfree_skb(skb);
1954		return NET_RX_SUCCESS;
1955	}
1956
1957	bh_lock_sock(sk);
1958	if (sk->sk_state == IUCV_CONNECTED) {
1959		sk->sk_state = IUCV_DISCONN;
1960		sk->sk_state_change(sk);
1961	}
1962	bh_unlock_sock(sk);
1963	consume_skb(skb);
 
1964	return NET_RX_SUCCESS;
1965}
1966
1967/*
1968 * afiucv_hs_callback_win() - react on received WIN
1969 */
1970static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
1971{
1972	struct iucv_sock *iucv = iucv_sk(sk);
1973
1974	if (!iucv)
1975		return NET_RX_SUCCESS;
1976
1977	if (sk->sk_state != IUCV_CONNECTED)
1978		return NET_RX_SUCCESS;
1979
1980	atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent);
1981	iucv_sock_wake_msglim(sk);
1982	return NET_RX_SUCCESS;
1983}
1984
1985/*
1986 * afiucv_hs_callback_rx() - react on received data
1987 */
1988static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
1989{
1990	struct iucv_sock *iucv = iucv_sk(sk);
1991
1992	if (!iucv) {
1993		kfree_skb(skb);
1994		return NET_RX_SUCCESS;
1995	}
1996
1997	if (sk->sk_state != IUCV_CONNECTED) {
1998		kfree_skb(skb);
1999		return NET_RX_SUCCESS;
2000	}
2001
2002	if (sk->sk_shutdown & RCV_SHUTDOWN) {
2003		kfree_skb(skb);
2004		return NET_RX_SUCCESS;
2005	}
2006
2007	/* write stuff from iucv_msg to skb cb */
2008	skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2009	skb_reset_transport_header(skb);
2010	skb_reset_network_header(skb);
2011	IUCV_SKB_CB(skb)->offset = 0;
2012	if (sk_filter(sk, skb)) {
2013		atomic_inc(&sk->sk_drops);	/* skb rejected by filter */
2014		kfree_skb(skb);
2015		return NET_RX_SUCCESS;
2016	}
2017
2018	spin_lock(&iucv->message_q.lock);
2019	if (skb_queue_empty(&iucv->backlog_skb_q)) {
2020		if (__sock_queue_rcv_skb(sk, skb))
2021			/* handle rcv queue full */
2022			skb_queue_tail(&iucv->backlog_skb_q, skb);
2023	} else
2024		skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2025	spin_unlock(&iucv->message_q.lock);
2026	return NET_RX_SUCCESS;
2027}
2028
2029/*
2030 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2031 *                   transport
2032 *                   called from netif RX softirq
2033 */
2034static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2035	struct packet_type *pt, struct net_device *orig_dev)
2036{
2037	struct sock *sk;
2038	struct iucv_sock *iucv;
2039	struct af_iucv_trans_hdr *trans_hdr;
2040	int err = NET_RX_SUCCESS;
2041	char nullstring[8];
2042
2043	if (!pskb_may_pull(skb, sizeof(*trans_hdr))) {
 
2044		kfree_skb(skb);
2045		return NET_RX_SUCCESS;
2046	}
2047
2048	trans_hdr = iucv_trans_hdr(skb);
2049	EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2050	EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2051	EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2052	EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2053	memset(nullstring, 0, sizeof(nullstring));
2054	iucv = NULL;
2055	sk = NULL;
2056	read_lock(&iucv_sk_list.lock);
2057	sk_for_each(sk, &iucv_sk_list.head) {
2058		if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2059			if ((!memcmp(&iucv_sk(sk)->src_name,
2060				     trans_hdr->destAppName, 8)) &&
2061			    (!memcmp(&iucv_sk(sk)->src_user_id,
2062				     trans_hdr->destUserID, 8)) &&
2063			    (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2064			    (!memcmp(&iucv_sk(sk)->dst_user_id,
2065				     nullstring, 8))) {
2066				iucv = iucv_sk(sk);
2067				break;
2068			}
2069		} else {
2070			if ((!memcmp(&iucv_sk(sk)->src_name,
2071				     trans_hdr->destAppName, 8)) &&
2072			    (!memcmp(&iucv_sk(sk)->src_user_id,
2073				     trans_hdr->destUserID, 8)) &&
2074			    (!memcmp(&iucv_sk(sk)->dst_name,
2075				     trans_hdr->srcAppName, 8)) &&
2076			    (!memcmp(&iucv_sk(sk)->dst_user_id,
2077				     trans_hdr->srcUserID, 8))) {
2078				iucv = iucv_sk(sk);
2079				break;
2080			}
2081		}
2082	}
2083	read_unlock(&iucv_sk_list.lock);
2084	if (!iucv)
2085		sk = NULL;
2086
2087	/* no sock
2088	how should we send with no sock
2089	1) send without sock no send rc checking?
2090	2) introduce default sock to handle this cases
2091
2092	 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2093	 data -> send FIN
2094	 SYN|ACK, SYN|FIN, FIN -> no action? */
2095
2096	switch (trans_hdr->flags) {
2097	case AF_IUCV_FLAG_SYN:
2098		/* connect request */
2099		err = afiucv_hs_callback_syn(sk, skb);
2100		break;
2101	case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2102		/* connect request confirmed */
2103		err = afiucv_hs_callback_synack(sk, skb);
2104		break;
2105	case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2106		/* connect request refused */
2107		err = afiucv_hs_callback_synfin(sk, skb);
2108		break;
2109	case (AF_IUCV_FLAG_FIN):
2110		/* close request */
2111		err = afiucv_hs_callback_fin(sk, skb);
2112		break;
2113	case (AF_IUCV_FLAG_WIN):
2114		err = afiucv_hs_callback_win(sk, skb);
2115		if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2116			consume_skb(skb);
2117			break;
2118		}
2119		fallthrough;	/* and receive non-zero length data */
2120	case (AF_IUCV_FLAG_SHT):
2121		/* shutdown request */
2122		fallthrough;	/* and receive zero length data */
2123	case 0:
2124		/* plain data frame */
2125		IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2126		err = afiucv_hs_callback_rx(sk, skb);
2127		break;
2128	default:
2129		kfree_skb(skb);
2130	}
2131
2132	return err;
2133}
2134
2135/*
2136 * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets
2137 *                                 transport
2138 */
2139static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n)
2140{
2141	struct iucv_sock *iucv = iucv_sk(sk);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2142
2143	if (sock_flag(sk, SOCK_ZAPPED))
2144		return;
2145
2146	switch (n) {
2147	case TX_NOTIFY_OK:
2148		atomic_dec(&iucv->skbs_in_xmit);
2149		iucv_sock_wake_msglim(sk);
2150		break;
2151	case TX_NOTIFY_PENDING:
2152		atomic_inc(&iucv->pendings);
2153		break;
2154	case TX_NOTIFY_DELAYED_OK:
2155		atomic_dec(&iucv->skbs_in_xmit);
2156		if (atomic_dec_return(&iucv->pendings) <= 0)
2157			iucv_sock_wake_msglim(sk);
2158		break;
2159	default:
2160		atomic_dec(&iucv->skbs_in_xmit);
2161		if (sk->sk_state == IUCV_CONNECTED) {
2162			sk->sk_state = IUCV_DISCONN;
2163			sk->sk_state_change(sk);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2164		}
2165	}
 
2166
2167	if (sk->sk_state == IUCV_CLOSING) {
2168		if (atomic_read(&iucv->skbs_in_xmit) == 0) {
2169			sk->sk_state = IUCV_CLOSED;
2170			sk->sk_state_change(sk);
2171		}
2172	}
 
2173}
2174
2175/*
2176 * afiucv_netdev_event: handle netdev notifier chain events
2177 */
2178static int afiucv_netdev_event(struct notifier_block *this,
2179			       unsigned long event, void *ptr)
2180{
2181	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2182	struct sock *sk;
2183	struct iucv_sock *iucv;
2184
2185	switch (event) {
2186	case NETDEV_REBOOT:
2187	case NETDEV_GOING_DOWN:
2188		sk_for_each(sk, &iucv_sk_list.head) {
2189			iucv = iucv_sk(sk);
2190			if ((iucv->hs_dev == event_dev) &&
2191			    (sk->sk_state == IUCV_CONNECTED)) {
2192				if (event == NETDEV_GOING_DOWN)
2193					iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2194				sk->sk_state = IUCV_DISCONN;
2195				sk->sk_state_change(sk);
2196			}
2197		}
2198		break;
2199	case NETDEV_DOWN:
2200	case NETDEV_UNREGISTER:
2201	default:
2202		break;
2203	}
2204	return NOTIFY_DONE;
2205}
2206
2207static struct notifier_block afiucv_netdev_notifier = {
2208	.notifier_call = afiucv_netdev_event,
2209};
2210
2211static const struct proto_ops iucv_sock_ops = {
2212	.family		= PF_IUCV,
2213	.owner		= THIS_MODULE,
2214	.release	= iucv_sock_release,
2215	.bind		= iucv_sock_bind,
2216	.connect	= iucv_sock_connect,
2217	.listen		= iucv_sock_listen,
2218	.accept		= iucv_sock_accept,
2219	.getname	= iucv_sock_getname,
2220	.sendmsg	= iucv_sock_sendmsg,
2221	.recvmsg	= iucv_sock_recvmsg,
2222	.poll		= iucv_sock_poll,
2223	.ioctl		= sock_no_ioctl,
2224	.mmap		= sock_no_mmap,
2225	.socketpair	= sock_no_socketpair,
2226	.shutdown	= iucv_sock_shutdown,
2227	.setsockopt	= iucv_sock_setsockopt,
2228	.getsockopt	= iucv_sock_getsockopt,
2229};
2230
2231static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
2232			    int kern)
2233{
2234	struct sock *sk;
2235
2236	if (protocol && protocol != PF_IUCV)
2237		return -EPROTONOSUPPORT;
2238
2239	sock->state = SS_UNCONNECTED;
2240
2241	switch (sock->type) {
2242	case SOCK_STREAM:
2243	case SOCK_SEQPACKET:
2244		/* currently, proto ops can handle both sk types */
2245		sock->ops = &iucv_sock_ops;
2246		break;
2247	default:
2248		return -ESOCKTNOSUPPORT;
2249	}
2250
2251	sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
2252	if (!sk)
2253		return -ENOMEM;
2254
2255	iucv_sock_init(sk, NULL);
2256
2257	return 0;
2258}
2259
2260static const struct net_proto_family iucv_sock_family_ops = {
2261	.family	= AF_IUCV,
2262	.owner	= THIS_MODULE,
2263	.create	= iucv_sock_create,
2264};
2265
2266static struct packet_type iucv_packet_type = {
2267	.type = cpu_to_be16(ETH_P_AF_IUCV),
2268	.func = afiucv_hs_rcv,
2269};
2270
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2271static int __init afiucv_init(void)
2272{
2273	int err;
2274
2275	if (MACHINE_IS_VM && IS_ENABLED(CONFIG_IUCV)) {
2276		cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2277		if (unlikely(err)) {
2278			WARN_ON(err);
2279			err = -EPROTONOSUPPORT;
2280			goto out;
2281		}
2282
2283		pr_iucv = &iucv_if;
 
 
 
 
2284	} else {
2285		memset(&iucv_userid, 0, sizeof(iucv_userid));
2286		pr_iucv = NULL;
2287	}
2288
2289	err = proto_register(&iucv_proto, 0);
2290	if (err)
2291		goto out;
2292	err = sock_register(&iucv_sock_family_ops);
2293	if (err)
2294		goto out_proto;
2295
2296	if (pr_iucv) {
2297		err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2298		if (err)
2299			goto out_sock;
2300	}
2301
2302	err = register_netdevice_notifier(&afiucv_netdev_notifier);
2303	if (err)
2304		goto out_notifier;
2305
2306	dev_add_pack(&iucv_packet_type);
2307	return 0;
2308
2309out_notifier:
2310	if (pr_iucv)
2311		pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2312out_sock:
2313	sock_unregister(PF_IUCV);
2314out_proto:
2315	proto_unregister(&iucv_proto);
2316out:
 
 
2317	return err;
2318}
2319
2320static void __exit afiucv_exit(void)
2321{
2322	if (pr_iucv)
2323		pr_iucv->iucv_unregister(&af_iucv_handler, 0);
 
 
2324
2325	unregister_netdevice_notifier(&afiucv_netdev_notifier);
2326	dev_remove_pack(&iucv_packet_type);
2327	sock_unregister(PF_IUCV);
2328	proto_unregister(&iucv_proto);
2329}
2330
2331module_init(afiucv_init);
2332module_exit(afiucv_exit);
2333
2334MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2335MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2336MODULE_VERSION(VERSION);
2337MODULE_LICENSE("GPL");
2338MODULE_ALIAS_NETPROTO(PF_IUCV);