af_iucv.c 60 KB
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/*
 *  IUCV protocol stack for Linux on zSeries
 *
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 *  Copyright IBM Corp. 2006, 2009
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 *
 *  Author(s):	Jennifer Hunt <jenhunt@us.ibm.com>
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 *		Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
 *  PM functions:
 *		Ursula Braun <ursula.braun@de.ibm.com>
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 */

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#define KMSG_COMPONENT "af_iucv"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

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#include <linux/module.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/poll.h>
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#include <linux/security.h>
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#include <net/sock.h>
#include <asm/ebcdic.h>
#include <asm/cpcmd.h>
#include <linux/kmod.h>

#include <net/iucv/af_iucv.h>

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#define VERSION "1.2"
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static char iucv_userid[80];

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static const struct proto_ops iucv_sock_ops;
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static struct proto iucv_proto = {
	.name		= "AF_IUCV",
	.owner		= THIS_MODULE,
	.obj_size	= sizeof(struct iucv_sock),
};

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static struct iucv_interface *pr_iucv;

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/* special AF_IUCV IPRM messages */
static const u8 iprm_shutdown[8] =
	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};

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#define TRGCLS_SIZE	(sizeof(((struct iucv_message *)0)->class))

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#define __iucv_sock_wait(sk, condition, timeo, ret)			\
do {									\
	DEFINE_WAIT(__wait);						\
	long __timeo = timeo;						\
	ret = 0;							\
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	prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);	\
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	while (!(condition)) {						\
		if (!__timeo) {						\
			ret = -EAGAIN;					\
			break;						\
		}							\
		if (signal_pending(current)) {				\
			ret = sock_intr_errno(__timeo);			\
			break;						\
		}							\
		release_sock(sk);					\
		__timeo = schedule_timeout(__timeo);			\
		lock_sock(sk);						\
		ret = sock_error(sk);					\
		if (ret)						\
			break;						\
	}								\
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	finish_wait(sk_sleep(sk), &__wait);				\
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} while (0)

#define iucv_sock_wait(sk, condition, timeo)				\
({									\
	int __ret = 0;							\
	if (!(condition))						\
		__iucv_sock_wait(sk, condition, timeo, __ret);		\
	__ret;								\
})
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static void iucv_sock_kill(struct sock *sk);
static void iucv_sock_close(struct sock *sk);
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static void iucv_sever_path(struct sock *, int);
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static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
	struct packet_type *pt, struct net_device *orig_dev);
static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
		   struct sk_buff *skb, u8 flags);
static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);

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/* Call Back functions */
static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
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static void iucv_callback_connack(struct iucv_path *, u8 *);
static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
static void iucv_callback_connrej(struct iucv_path *, u8 *);
static void iucv_callback_shutdown(struct iucv_path *, u8 *);
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static struct iucv_sock_list iucv_sk_list = {
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	.lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
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	.autobind_name = ATOMIC_INIT(0)
};

static struct iucv_handler af_iucv_handler = {
	.path_pending	  = iucv_callback_connreq,
	.path_complete	  = iucv_callback_connack,
	.path_severed	  = iucv_callback_connrej,
	.message_pending  = iucv_callback_rx,
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	.message_complete = iucv_callback_txdone,
	.path_quiesced	  = iucv_callback_shutdown,
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};

static inline void high_nmcpy(unsigned char *dst, char *src)
{
       memcpy(dst, src, 8);
}

static inline void low_nmcpy(unsigned char *dst, char *src)
{
       memcpy(&dst[8], src, 8);
}

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static int afiucv_pm_prepare(struct device *dev)
{
#ifdef CONFIG_PM_DEBUG
	printk(KERN_WARNING "afiucv_pm_prepare\n");
#endif
	return 0;
}

static void afiucv_pm_complete(struct device *dev)
{
#ifdef CONFIG_PM_DEBUG
	printk(KERN_WARNING "afiucv_pm_complete\n");
#endif
}

/**
 * afiucv_pm_freeze() - Freeze PM callback
 * @dev:	AFIUCV dummy device
 *
 * Sever all established IUCV communication pathes
 */
static int afiucv_pm_freeze(struct device *dev)
{
	struct iucv_sock *iucv;
	struct sock *sk;

#ifdef CONFIG_PM_DEBUG
	printk(KERN_WARNING "afiucv_pm_freeze\n");
#endif
	read_lock(&iucv_sk_list.lock);
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	sk_for_each(sk, &iucv_sk_list.head) {
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		iucv = iucv_sk(sk);
		switch (sk->sk_state) {
		case IUCV_DISCONN:
		case IUCV_CLOSING:
		case IUCV_CONNECTED:
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			iucv_sever_path(sk, 0);
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			break;
		case IUCV_OPEN:
		case IUCV_BOUND:
		case IUCV_LISTEN:
		case IUCV_CLOSED:
		default:
			break;
		}
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		skb_queue_purge(&iucv->send_skb_q);
		skb_queue_purge(&iucv->backlog_skb_q);
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	}
	read_unlock(&iucv_sk_list.lock);
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	return 0;
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}

/**
 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
 * @dev:	AFIUCV dummy device
 *
 * socket clean up after freeze
 */
static int afiucv_pm_restore_thaw(struct device *dev)
{
	struct sock *sk;

#ifdef CONFIG_PM_DEBUG
	printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
#endif
	read_lock(&iucv_sk_list.lock);
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	sk_for_each(sk, &iucv_sk_list.head) {
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		switch (sk->sk_state) {
		case IUCV_CONNECTED:
			sk->sk_err = EPIPE;
			sk->sk_state = IUCV_DISCONN;
			sk->sk_state_change(sk);
			break;
		case IUCV_DISCONN:
		case IUCV_CLOSING:
		case IUCV_LISTEN:
		case IUCV_BOUND:
		case IUCV_OPEN:
		default:
			break;
		}
	}
	read_unlock(&iucv_sk_list.lock);
	return 0;
}

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static const struct dev_pm_ops afiucv_pm_ops = {
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	.prepare = afiucv_pm_prepare,
	.complete = afiucv_pm_complete,
	.freeze = afiucv_pm_freeze,
	.thaw = afiucv_pm_restore_thaw,
	.restore = afiucv_pm_restore_thaw,
};

static struct device_driver af_iucv_driver = {
	.owner = THIS_MODULE,
	.name = "afiucv",
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	.bus  = NULL,
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	.pm   = &afiucv_pm_ops,
};

/* dummy device used as trigger for PM functions */
static struct device *af_iucv_dev;

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/**
 * iucv_msg_length() - Returns the length of an iucv message.
 * @msg:	Pointer to struct iucv_message, MUST NOT be NULL
 *
 * The function returns the length of the specified iucv message @msg of data
 * stored in a buffer and of data stored in the parameter list (PRMDATA).
 *
 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 * data:
 *	PRMDATA[0..6]	socket data (max 7 bytes);
 *	PRMDATA[7]	socket data length value (len is 0xff - PRMDATA[7])
 *
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 * The socket data length is computed by subtracting the socket data length
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 * value from 0xFF.
 * If the socket data len is greater 7, then PRMDATA can be used for special
 * notifications (see iucv_sock_shutdown); and further,
 * if the socket data len is > 7, the function returns 8.
 *
 * Use this function to allocate socket buffers to store iucv message data.
 */
static inline size_t iucv_msg_length(struct iucv_message *msg)
{
	size_t datalen;

	if (msg->flags & IUCV_IPRMDATA) {
		datalen = 0xff - msg->rmmsg[7];
		return (datalen < 8) ? datalen : 8;
	}
	return msg->length;
}

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/**
 * iucv_sock_in_state() - check for specific states
 * @sk:		sock structure
 * @state:	first iucv sk state
 * @state:	second iucv sk state
 *
 * Returns true if the socket in either in the first or second state.
 */
static int iucv_sock_in_state(struct sock *sk, int state, int state2)
{
	return (sk->sk_state == state || sk->sk_state == state2);
}

/**
 * iucv_below_msglim() - function to check if messages can be sent
 * @sk:		sock structure
 *
 * Returns true if the send queue length is lower than the message limit.
 * Always returns true if the socket is not connected (no iucv path for
 * checking the message limit).
 */
static inline int iucv_below_msglim(struct sock *sk)
{
	struct iucv_sock *iucv = iucv_sk(sk);

	if (sk->sk_state != IUCV_CONNECTED)
		return 1;
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	if (iucv->transport == AF_IUCV_TRANS_IUCV)
		return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
	else
		return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
			(atomic_read(&iucv->pendings) <= 0));
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}

/**
 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
 */
static void iucv_sock_wake_msglim(struct sock *sk)
{
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	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
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	if (skwq_has_sleeper(wq))
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		wake_up_interruptible_all(&wq->wait);
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	sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
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	rcu_read_unlock();
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}

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/**
 * afiucv_hs_send() - send a message through HiperSockets transport
 */
static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
		   struct sk_buff *skb, u8 flags)
{
	struct iucv_sock *iucv = iucv_sk(sock);
	struct af_iucv_trans_hdr *phs_hdr;
	struct sk_buff *nskb;
	int err, confirm_recv = 0;

	memset(skb->head, 0, ETH_HLEN);
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	phs_hdr = skb_push(skb, sizeof(struct af_iucv_trans_hdr));
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	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	skb_push(skb, ETH_HLEN);
	skb_reset_mac_header(skb);
	memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));

	phs_hdr->magic = ETH_P_AF_IUCV;
	phs_hdr->version = 1;
	phs_hdr->flags = flags;
	if (flags == AF_IUCV_FLAG_SYN)
		phs_hdr->window = iucv->msglimit;
	else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
		confirm_recv = atomic_read(&iucv->msg_recv);
		phs_hdr->window = confirm_recv;
		if (confirm_recv)
			phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
	}
	memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
	memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
	memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
	memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
	ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
	ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
	ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
	ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
	if (imsg)
		memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));

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	skb->dev = iucv->hs_dev;
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	if (!skb->dev) {
		err = -ENODEV;
		goto err_free;
	}
	if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
		err = -ENETDOWN;
		goto err_free;
	}
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	if (skb->len > skb->dev->mtu) {
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		if (sock->sk_type == SOCK_SEQPACKET) {
			err = -EMSGSIZE;
			goto err_free;
		}
		skb_trim(skb, skb->dev->mtu);
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	}
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	skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
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	nskb = skb_clone(skb, GFP_ATOMIC);
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	if (!nskb) {
		err = -ENOMEM;
		goto err_free;
	}

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	skb_queue_tail(&iucv->send_skb_q, nskb);
	err = dev_queue_xmit(skb);
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	if (net_xmit_eval(err)) {
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		skb_unlink(nskb, &iucv->send_skb_q);
		kfree_skb(nskb);
	} else {
		atomic_sub(confirm_recv, &iucv->msg_recv);
		WARN_ON(atomic_read(&iucv->msg_recv) < 0);
	}
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	return net_xmit_eval(err);
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err_free:
	kfree_skb(skb);
	return err;
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}

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static struct sock *__iucv_get_sock_by_name(char *nm)
{
	struct sock *sk;

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	sk_for_each(sk, &iucv_sk_list.head)
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		if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
			return sk;

	return NULL;
}

static void iucv_sock_destruct(struct sock *sk)
{
	skb_queue_purge(&sk->sk_receive_queue);
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	skb_queue_purge(&sk->sk_error_queue);

	sk_mem_reclaim(sk);

	if (!sock_flag(sk, SOCK_DEAD)) {
		pr_err("Attempt to release alive iucv socket %p\n", sk);
		return;
	}

	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
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	WARN_ON(refcount_read(&sk->sk_wmem_alloc));
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	WARN_ON(sk->sk_wmem_queued);
	WARN_ON(sk->sk_forward_alloc);
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}

/* Cleanup Listen */
static void iucv_sock_cleanup_listen(struct sock *parent)
{
	struct sock *sk;

	/* Close non-accepted connections */
	while ((sk = iucv_accept_dequeue(parent, NULL))) {
		iucv_sock_close(sk);
		iucv_sock_kill(sk);
	}

	parent->sk_state = IUCV_CLOSED;
}

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/* Kill socket (only if zapped and orphaned) */
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static void iucv_sock_kill(struct sock *sk)
{
	if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
		return;

	iucv_sock_unlink(&iucv_sk_list, sk);
	sock_set_flag(sk, SOCK_DEAD);
	sock_put(sk);
}

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/* Terminate an IUCV path */
static void iucv_sever_path(struct sock *sk, int with_user_data)
{
	unsigned char user_data[16];
	struct iucv_sock *iucv = iucv_sk(sk);
	struct iucv_path *path = iucv->path;

	if (iucv->path) {
		iucv->path = NULL;
		if (with_user_data) {
			low_nmcpy(user_data, iucv->src_name);
			high_nmcpy(user_data, iucv->dst_name);
			ASCEBC(user_data, sizeof(user_data));
			pr_iucv->path_sever(path, user_data);
		} else
			pr_iucv->path_sever(path, NULL);
		iucv_path_free(path);
	}
}

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/* Send controlling flags through an IUCV socket for HIPER transport */
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static int iucv_send_ctrl(struct sock *sk, u8 flags)
{
	int err = 0;
	int blen;
	struct sk_buff *skb;
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	u8 shutdown = 0;
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	blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
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	if (sk->sk_shutdown & SEND_SHUTDOWN) {
		/* controlling flags should be sent anyway */
		shutdown = sk->sk_shutdown;
		sk->sk_shutdown &= RCV_SHUTDOWN;
	}
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	skb = sock_alloc_send_skb(sk, blen, 1, &err);
	if (skb) {
		skb_reserve(skb, blen);
		err = afiucv_hs_send(NULL, sk, skb, flags);
	}
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	if (shutdown)
		sk->sk_shutdown = shutdown;
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	return err;
}

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/* Close an IUCV socket */
static void iucv_sock_close(struct sock *sk)
{
	struct iucv_sock *iucv = iucv_sk(sk);
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	unsigned long timeo;
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	int err = 0;
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	lock_sock(sk);

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	switch (sk->sk_state) {
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	case IUCV_LISTEN:
		iucv_sock_cleanup_listen(sk);
		break;

	case IUCV_CONNECTED:
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		if (iucv->transport == AF_IUCV_TRANS_HIPER) {
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			err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
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			sk->sk_state = IUCV_DISCONN;
			sk->sk_state_change(sk);
		}
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	case IUCV_DISCONN:   /* fall through */
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		sk->sk_state = IUCV_CLOSING;
		sk->sk_state_change(sk);

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		if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
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			if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
				timeo = sk->sk_lingertime;
			else
				timeo = IUCV_DISCONN_TIMEOUT;
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			iucv_sock_wait(sk,
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					iucv_sock_in_state(sk, IUCV_CLOSED, 0),
					timeo);
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		}

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	case IUCV_CLOSING:   /* fall through */
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		sk->sk_state = IUCV_CLOSED;
		sk->sk_state_change(sk);

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		sk->sk_err = ECONNRESET;
		sk->sk_state_change(sk);

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		skb_queue_purge(&iucv->send_skb_q);
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		skb_queue_purge(&iucv->backlog_skb_q);
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	default:   /* fall through */
		iucv_sever_path(sk, 1);
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	}
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	if (iucv->hs_dev) {
		dev_put(iucv->hs_dev);
		iucv->hs_dev = NULL;
		sk->sk_bound_dev_if = 0;
	}

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	/* mark socket for deletion by iucv_sock_kill() */
	sock_set_flag(sk, SOCK_ZAPPED);

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	release_sock(sk);
}

static void iucv_sock_init(struct sock *sk, struct sock *parent)
{
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	if (parent) {
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		sk->sk_type = parent->sk_type;
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		security_sk_clone(parent, sk);
	}
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}

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static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
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{
	struct sock *sk;
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	struct iucv_sock *iucv;
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	sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
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	if (!sk)
		return NULL;
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	iucv = iucv_sk(sk);
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	sock_init_data(sock, sk);
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	INIT_LIST_HEAD(&iucv->accept_q);
	spin_lock_init(&iucv->accept_q_lock);
	skb_queue_head_init(&iucv->send_skb_q);
	INIT_LIST_HEAD(&iucv->message_q.list);
	spin_lock_init(&iucv->message_q.lock);
	skb_queue_head_init(&iucv->backlog_skb_q);
	iucv->send_tag = 0;
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	atomic_set(&iucv->pendings, 0);
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	iucv->flags = 0;
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	iucv->msglimit = 0;
	atomic_set(&iucv->msg_sent, 0);
	atomic_set(&iucv->msg_recv, 0);
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	iucv->path = NULL;
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	iucv->sk_txnotify = afiucv_hs_callback_txnotify;
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	memset(&iucv->src_user_id , 0, 32);
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	if (pr_iucv)
		iucv->transport = AF_IUCV_TRANS_IUCV;
	else
		iucv->transport = AF_IUCV_TRANS_HIPER;
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	sk->sk_destruct = iucv_sock_destruct;
	sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
	sk->sk_allocation = GFP_DMA;

	sock_reset_flag(sk, SOCK_ZAPPED);

	sk->sk_protocol = proto;
	sk->sk_state	= IUCV_OPEN;

	iucv_sock_link(&iucv_sk_list, sk);
	return sk;
}

/* Create an IUCV socket */
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static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
			    int kern)
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{
	struct sock *sk;

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	if (protocol && protocol != PF_IUCV)
		return -EPROTONOSUPPORT;
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	sock->state = SS_UNCONNECTED;
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	switch (sock->type) {
	case SOCK_STREAM:
		sock->ops = &iucv_sock_ops;
		break;
	case SOCK_SEQPACKET:
		/* currently, proto ops can handle both sk types */
		sock->ops = &iucv_sock_ops;
		break;
	default:
		return -ESOCKTNOSUPPORT;
	}
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625
	sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
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	if (!sk)
		return -ENOMEM;

	iucv_sock_init(sk, NULL);

	return 0;
}

void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
{
	write_lock_bh(&l->lock);
	sk_add_node(sk, &l->head);
	write_unlock_bh(&l->lock);
}

void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
{
	write_lock_bh(&l->lock);
	sk_del_node_init(sk);
	write_unlock_bh(&l->lock);
}

void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
{
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	unsigned long flags;
	struct iucv_sock *par = iucv_sk(parent);

653
	sock_hold(sk);
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	spin_lock_irqsave(&par->accept_q_lock, flags);
	list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
	spin_unlock_irqrestore(&par->accept_q_lock, flags);
657
	iucv_sk(sk)->parent = parent;
658
	sk_acceptq_added(parent);
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}

void iucv_accept_unlink(struct sock *sk)
{
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	unsigned long flags;
	struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);

	spin_lock_irqsave(&par->accept_q_lock, flags);
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	list_del_init(&iucv_sk(sk)->accept_q);
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	spin_unlock_irqrestore(&par->accept_q_lock, flags);
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	sk_acceptq_removed(iucv_sk(sk)->parent);
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	iucv_sk(sk)->parent = NULL;
	sock_put(sk);
}

struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
{
	struct iucv_sock *isk, *n;
	struct sock *sk;

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	list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
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		sk = (struct sock *) isk;
		lock_sock(sk);

		if (sk->sk_state == IUCV_CLOSED) {
			iucv_accept_unlink(sk);
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			release_sock(sk);
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			continue;
		}

		if (sk->sk_state == IUCV_CONNECTED ||
690
		    sk->sk_state == IUCV_DISCONN ||
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		    !newsock) {
			iucv_accept_unlink(sk);
			if (newsock)
				sock_graft(sk, newsock);

			release_sock(sk);
			return sk;
		}

		release_sock(sk);
	}
	return NULL;
}

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static void __iucv_auto_name(struct iucv_sock *iucv)
{
	char name[12];

	sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
	while (__iucv_get_sock_by_name(name)) {
		sprintf(name, "%08x",
			atomic_inc_return(&iucv_sk_list.autobind_name));
	}
	memcpy(iucv->src_name, name, 8);
}

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/* Bind an unbound socket */
static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
			  int addr_len)
{
	struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
	struct sock *sk = sock->sk;
	struct iucv_sock *iucv;
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	int err = 0;
	struct net_device *dev;
	char uid[9];
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	/* Verify the input sockaddr */
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	if (addr_len < sizeof(struct sockaddr_iucv) ||
	    addr->sa_family != AF_IUCV)
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		return -EINVAL;

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	lock_sock(sk);
	if (sk->sk_state != IUCV_OPEN) {
		err = -EBADFD;
		goto done;
	}

	write_lock_bh(&iucv_sk_list.lock);

	iucv = iucv_sk(sk);
	if (__iucv_get_sock_by_name(sa->siucv_name)) {
		err = -EADDRINUSE;
		goto done_unlock;
	}
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	if (iucv->path)
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		goto done_unlock;

	/* Bind the socket */
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	if (pr_iucv)
		if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
			goto vm_bind; /* VM IUCV transport */
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	/* try hiper transport */
	memcpy(uid, sa->siucv_user_id, sizeof(uid));
	ASCEBC(uid, 8);
	rcu_read_lock();
	for_each_netdev_rcu(&init_net, dev) {
		if (!memcmp(dev->perm_addr, uid, 8)) {
			memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
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			/* Check for unitialized siucv_name */
			if (strncmp(sa->siucv_name, "        ", 8) == 0)
				__iucv_auto_name(iucv);
			else
				memcpy(iucv->src_name, sa->siucv_name, 8);
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			sk->sk_bound_dev_if = dev->ifindex;
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			iucv->hs_dev = dev;
			dev_hold(dev);
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			sk->sk_state = IUCV_BOUND;
			iucv->transport = AF_IUCV_TRANS_HIPER;
			if (!iucv->msglimit)
				iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
			rcu_read_unlock();
			goto done_unlock;
		}
	}
	rcu_read_unlock();
vm_bind:
	if (pr_iucv) {
		/* use local userid for backward compat */
		memcpy(iucv->src_name, sa->siucv_name, 8);
		memcpy(iucv->src_user_id, iucv_userid, 8);
		sk->sk_state = IUCV_BOUND;
		iucv->transport = AF_IUCV_TRANS_IUCV;
		if (!iucv->msglimit)
			iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
		goto done_unlock;
	}
	/* found no dev to bind */
	err = -ENODEV;
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done_unlock:
	/* Release the socket list lock */
	write_unlock_bh(&iucv_sk_list.lock);
done:
	release_sock(sk);
	return err;
}

/* Automatically bind an unbound socket */
static int iucv_sock_autobind(struct sock *sk)
{
	struct iucv_sock *iucv = iucv_sk(sk);
	int err = 0;

805
	if (unlikely(!pr_iucv))
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		return -EPROTO;

808
	memcpy(iucv->src_user_id, iucv_userid, 8);
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	write_lock_bh(&iucv_sk_list.lock);
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	__iucv_auto_name(iucv);
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	write_unlock_bh(&iucv_sk_list.lock);

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	if (!iucv->msglimit)
		iucv->msglimit = IUCV_QUEUELEN_DEFAULT;

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	return err;
}

820
static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
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{
	struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
	struct sock *sk = sock->sk;
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	struct iucv_sock *iucv = iucv_sk(sk);
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	unsigned char user_data[16];
	int err;

	high_nmcpy(user_data, sa->siucv_name);
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	low_nmcpy(user_data, iucv->src_name);
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	ASCEBC(user_data, sizeof(user_data));

	/* Create path. */
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	iucv->path = iucv_path_alloc(iucv->msglimit,
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				     IUCV_IPRMDATA, GFP_KERNEL);
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	if (!iucv->path) {
		err = -ENOMEM;
		goto done;
	}
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	err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
				    sa->siucv_user_id, NULL, user_data,
				    sk);
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	if (err) {
		iucv_path_free(iucv->path);
		iucv->path = NULL;
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		switch (err) {
		case 0x0b:	/* Target communicator is not logged on */
			err = -ENETUNREACH;
			break;
		case 0x0d:	/* Max connections for this guest exceeded */
		case 0x0e:	/* Max connections for target guest exceeded */
			err = -EAGAIN;
			break;
		case 0x0f:	/* Missing IUCV authorization */
			err = -EACCES;
			break;
		default:
			err = -ECONNREFUSED;
			break;
		}
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	}
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done:
	return err;
}
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/* Connect an unconnected socket */
static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
			     int alen, int flags)
{
	struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
	struct sock *sk = sock->sk;
	struct iucv_sock *iucv = iucv_sk(sk);
	int err;

874
	if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
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		return -EINVAL;

	if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
		return -EBADFD;

	if (sk->sk_state == IUCV_OPEN &&
	    iucv->transport == AF_IUCV_TRANS_HIPER)
		return -EBADFD; /* explicit bind required */

	if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
		return -EINVAL;

	if (sk->sk_state == IUCV_OPEN) {
		err = iucv_sock_autobind(sk);
		if (unlikely(err))
			return err;
	}

	lock_sock(sk);

	/* Set the destination information */
	memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
	memcpy(iucv->dst_name, sa->siucv_name, 8);

	if (iucv->transport == AF_IUCV_TRANS_HIPER)
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Ursula Braun committed
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		err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
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	else
		err = afiucv_path_connect(sock, addr);
	if (err)
		goto done;

	if (sk->sk_state != IUCV_CONNECTED)
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		err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
							    IUCV_DISCONN),
				     sock_sndtimeo(sk, flags & O_NONBLOCK));
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911
	if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
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		err = -ECONNREFUSED;
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	if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
		iucv_sever_path(sk, 0);
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done:
	release_sock(sk);
	return err;
}

/* Move a socket into listening state. */
static int iucv_sock_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
	int err;

	lock_sock(sk);

	err = -EINVAL;
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	if (sk->sk_state != IUCV_BOUND)
		goto done;

	if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
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		goto done;

	sk->sk_max_ack_backlog = backlog;
	sk->sk_ack_backlog = 0;
	sk->sk_state = IUCV_LISTEN;
	err = 0;

done:
	release_sock(sk);
	return err;
}

/* Accept a pending connection */
static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
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			    int flags, bool kern)
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{
	DECLARE_WAITQUEUE(wait, current);
	struct sock *sk = sock->sk, *nsk;
	long timeo;
	int err = 0;

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	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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	if (sk->sk_state != IUCV_LISTEN) {
		err = -EBADFD;
		goto done;
	}

	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);

	/* Wait for an incoming connection */
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Eric Dumazet committed
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	add_wait_queue_exclusive(sk_sleep(sk), &wait);
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	while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
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		set_current_state(TASK_INTERRUPTIBLE);
		if (!timeo) {
			err = -EAGAIN;
			break;
		}

		release_sock(sk);
		timeo = schedule_timeout(timeo);
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		lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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		if (sk->sk_state != IUCV_LISTEN) {
			err = -EBADFD;
			break;
		}

		if (signal_pending(current)) {
			err = sock_intr_errno(timeo);
			break;
		}
	}

	set_current_state(TASK_RUNNING);
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Eric Dumazet committed
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	remove_wait_queue(sk_sleep(sk), &wait);
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	if (err)
		goto done;

	newsock->state = SS_CONNECTED;

done:
	release_sock(sk);
	return err;
}

static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
1003
			     int peer)
1004 1005 1006
{
	struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
	struct sock *sk = sock->sk;
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	struct iucv_sock *iucv = iucv_sk(sk);
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	addr->sa_family = AF_IUCV;

	if (peer) {
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		memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
		memcpy(siucv->siucv_name, iucv->dst_name, 8);
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	} else {
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		memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
		memcpy(siucv->siucv_name, iucv->src_name, 8);
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	}
	memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
	memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
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	memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
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1022
	return sizeof(struct sockaddr_iucv);
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}

1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
/**
 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
 * @path:	IUCV path
 * @msg:	Pointer to a struct iucv_message
 * @skb:	The socket data to send, skb->len MUST BE <= 7
 *
 * Send the socket data in the parameter list in the iucv message
 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
 * list and the socket data len at index 7 (last byte).
 * See also iucv_msg_length().
 *
 * Returns the error code from the iucv_message_send() call.
 */
static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
			  struct sk_buff *skb)
{
	u8 prmdata[8];

	memcpy(prmdata, (void *) skb->data, skb->len);
	prmdata[7] = 0xff - (u8) skb->len;
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	return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
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				 (void *) prmdata, 8);
}

1049 1050
static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
			     size_t len)
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{
	struct sock *sk = sock->sk;
	struct iucv_sock *iucv = iucv_sk(sk);
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	size_t headroom = 0;
	size_t linear;
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	struct sk_buff *skb;
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	struct iucv_message txmsg = {0};
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	struct cmsghdr *cmsg;
	int cmsg_done;
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	long timeo;
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	char user_id[9];
	char appl_id[9];
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	int err;
1064
	int noblock = msg->msg_flags & MSG_DONTWAIT;
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	err = sock_error(sk);
	if (err)
		return err;

	if (msg->msg_flags & MSG_OOB)
		return -EOPNOTSUPP;

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	/* SOCK_SEQPACKET: we do not support segmented records */
	if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
		return -EOPNOTSUPP;

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	lock_sock(sk);

	if (sk->sk_shutdown & SEND_SHUTDOWN) {
		err = -EPIPE;
		goto out;
	}

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	/* Return if the socket is not in connected state */
	if (sk->sk_state != IUCV_CONNECTED) {
		err = -ENOTCONN;
		goto out;
	}
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	/* initialize defaults */
	cmsg_done   = 0;	/* check for duplicate headers */
	txmsg.class = 0;
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1094
	/* iterate over control messages */
1095
	for_each_cmsghdr(cmsg, msg) {
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		if (!CMSG_OK(msg, cmsg)) {
			err = -EINVAL;
			goto out;
		}
1100

1101 1102
		if (cmsg->cmsg_level != SOL_IUCV)
			continue;
1103

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		if (cmsg->cmsg_type & cmsg_done) {
			err = -EINVAL;
			goto out;
		}
		cmsg_done |= cmsg->cmsg_type;
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		switch (cmsg->cmsg_type) {
		case SCM_IUCV_TRGCLS:
			if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
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				err = -EINVAL;
				goto out;
			}

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			/* set iucv message target class */
			memcpy(&txmsg.class,
				(void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
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1121
			break;
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		default:
			err = -EINVAL;
			goto out;
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		}
1127
	}
1128

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	/* allocate one skb for each iucv message:
	 * this is fine for SOCK_SEQPACKET (unless we want to support
	 * segmented records using the MSG_EOR flag), but
	 * for SOCK_STREAM we might want to improve it in future */
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	if (iucv->transport == AF_IUCV_TRANS_HIPER) {
		headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
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		linear = len;
	} else {
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		if (len < PAGE_SIZE) {
			linear = len;
		} else {
			/* In nonlinear "classic" iucv skb,
			 * reserve space for iucv_array
			 */
			headroom = sizeof(struct iucv_array) *
				   (MAX_SKB_FRAGS + 1);
			linear = PAGE_SIZE - headroom;
		}
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	}
	skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
				   noblock, &err, 0);
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	if (!skb)
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		goto out;
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	if (headroom)
		skb_reserve(skb, headroom);
	skb_put(skb, linear);
	skb->len = len;
	skb->data_len = len - linear;
	err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
	if (err)
1159
		goto fail;
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1161 1162 1163 1164 1165
	/* wait if outstanding messages for iucv path has reached */
	timeo = sock_sndtimeo(sk, noblock);
	err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
	if (err)
		goto fail;
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1167 1168 1169 1170 1171
	/* return -ECONNRESET if the socket is no longer connected */
	if (sk->sk_state != IUCV_CONNECTED) {
		err = -ECONNRESET;
		goto fail;
	}
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1173 1174
	/* increment and save iucv message tag for msg_completion cbk */
	txmsg.tag = iucv->send_tag++;
1175
	IUCV_SKB_CB(skb)->tag = txmsg.tag;
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	if (iucv->transport == AF_IUCV_TRANS_HIPER) {
		atomic_inc(&iucv->msg_sent);
		err = afiucv_hs_send(&txmsg, sk, skb, 0);
		if (err) {
			atomic_dec(&iucv->msg_sent);
1182
			goto out;
1183
		}
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	} else { /* Classic VM IUCV transport */
		skb_queue_tail(&iucv->send_skb_q, skb);

		if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
		    skb->len <= 7) {
			err = iucv_send_iprm(iucv->path, &txmsg, skb);

			/* on success: there is no message_complete callback */
			/* for an IPRMDATA msg; remove skb from send queue   */
			if (err == 0) {
				skb_unlink(skb, &iucv->send_skb_q);
				kfree_skb(skb);
			}
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			/* this error should never happen since the	*/
			/* IUCV_IPRMDATA path flag is set... sever path */
			if (err == 0x15) {
				pr_iucv->path_sever(iucv->path, NULL);
				skb_unlink(skb, &iucv->send_skb_q);
				err = -EPIPE;
				goto fail;
			}
		} else if (skb_is_nonlinear(skb)) {
			struct iucv_array *iba = (struct iucv_array *)skb->head;
			int i;

			/* skip iucv_array lying in the headroom */
			iba[0].address = (u32)(addr_t)skb->data;
			iba[0].length = (u32)skb_headlen(skb);
			for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
				skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

				iba[i + 1].address =
					(u32)(addr_t)skb_frag_address(frag);
				iba[i + 1].length = (u32)skb_frag_size(frag);
			}
			err = pr_iucv->message_send(iucv->path, &txmsg,
						    IUCV_IPBUFLST, 0,
						    (void *)iba, skb->len);
		} else { /* non-IPRM Linear skb */
			err = pr_iucv->message_send(iucv->path, &txmsg,
					0, 0, (void *)skb->data, skb->len);
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		}
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		if (err) {
			if (err == 3) {
				user_id[8] = 0;
				memcpy(user_id, iucv->dst_user_id, 8);
				appl_id[8] = 0;
				memcpy(appl_id, iucv->dst_name, 8);
				pr_err(
		"Application %s on z/VM guest %s exceeds message limit\n",
					appl_id, user_id);
				err = -EAGAIN;
			} else {
				err = -EPIPE;
			}
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			skb_unlink(skb, &iucv->send_skb_q);
			goto fail;
		}
	}

	release_sock(sk);
	return len;

fail:
	kfree_skb(skb);
out:
	release_sock(sk);
	return err;
}

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static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
{
	size_t headroom, linear;
	struct sk_buff *skb;
	int err;

	if (len < PAGE_SIZE) {
		headroom = 0;
		linear = len;
	} else {
		headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
		linear = PAGE_SIZE - headroom;
	}
	skb = alloc_skb_with_frags(headroom + linear, len - linear,
				   0, &err, GFP_ATOMIC | GFP_DMA);
	WARN_ONCE(!skb,
		  "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
		  len, err);
	if (skb) {
		if (headroom)
			skb_reserve(skb, headroom);
		skb_put(skb, linear);
		skb->len = len;
		skb->data_len = len - linear;
	}
	return skb;
}

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/* iucv_process_message() - Receive a single outstanding IUCV message
 *
 * Locking: must be called with message_q.lock held
 */
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static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
				 struct iucv_path *path,
				 struct iucv_message *msg)
{
	int rc;
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	unsigned int len;

	len = iucv_msg_length(msg);
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	/* store msg target class in the second 4 bytes of skb ctrl buffer */
	/* Note: the first 4 bytes are reserved for msg tag */
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	IUCV_SKB_CB(skb)->class = msg->class;
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	/* check for special IPRM messages (e.g. iucv_sock_shutdown) */
	if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
		if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
			skb->data = NULL;
			skb->len = 0;
		}
1306
	} else {
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		if (skb_is_nonlinear(skb)) {
			struct iucv_array *iba = (struct iucv_array *)skb->head;
			int i;

			iba[0].address = (u32)(addr_t)skb->data;
			iba[0].length = (u32)skb_headlen(skb);
			for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
				skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

				iba[i + 1].address =
					(u32)(addr_t)skb_frag_address(frag);
				iba[i + 1].length = (u32)skb_frag_size(frag);
			}
			rc = pr_iucv->message_receive(path, msg,
					      IUCV_IPBUFLST,
					      (void *)iba, len, NULL);
		} else {
			rc = pr_iucv->message_receive(path, msg,
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					      msg->flags & IUCV_IPRMDATA,
					      skb->data, len, NULL);
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		}
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		if (rc) {
			kfree_skb(skb);
			return;
		}
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		WARN_ON_ONCE(skb->len != len);
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	}

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	IUCV_SKB_CB(skb)->offset = 0;
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	if (sk_filter(sk, skb)) {
		atomic_inc(&sk->sk_drops);	/* skb rejected by filter */
		kfree_skb(skb);
		return;
	}
	if (__sock_queue_rcv_skb(sk, skb))	/* handle rcv queue full */
		skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
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}

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/* iucv_process_message_q() - Process outstanding IUCV messages
 *
 * Locking: must be called with message_q.lock held
 */
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static void iucv_process_message_q(struct sock *sk)
{
	struct iucv_sock *iucv = iucv_sk(sk);
	struct sk_buff *skb;
	struct sock_msg_q *p, *n;

	list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
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		skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
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		if (!skb)
			break;
		iucv_process_message(sk, skb, p->path, &p->msg);
		list_del(&p->list);
		kfree(p);
		if (!skb_queue_empty(&iucv->backlog_skb_q))
			break;
	}
}

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static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
			     size_t len, int flags)
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{
	int noblock = flags & MSG_DONTWAIT;
	struct sock *sk = sock->sk;
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	struct iucv_sock *iucv = iucv_sk(sk);
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	unsigned int copied, rlen;
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	struct sk_buff *skb, *rskb, *cskb;
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	int err = 0;
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	u32 offset;
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	if ((sk->sk_state == IUCV_DISCONN) &&
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	    skb_queue_empty(&iucv->backlog_skb_q) &&
	    skb_queue_empty(&sk->sk_receive_queue) &&
	    list_empty(&iucv->message_q.list))
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		return 0;

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	if (flags & (MSG_OOB))
		return -EOPNOTSUPP;

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	/* receive/dequeue next skb:
	 * the function understands MSG_PEEK and, thus, does not dequeue skb */
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	skb = skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb) {
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			return 0;
		return err;
	}

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	offset = IUCV_SKB_CB(skb)->offset;
	rlen   = skb->len - offset;		/* real length of skb */
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	copied = min_t(unsigned int, rlen, len);
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	if (!rlen)
		sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
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1402
	cskb = skb;
1403
	if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
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		if (!(flags & MSG_PEEK))
			skb_queue_head(&sk->sk_receive_queue, skb);
		return -EFAULT;
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	}

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	/* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
	if (sk->sk_type == SOCK_SEQPACKET) {
		if (copied < rlen)
			msg->msg_flags |= MSG_TRUNC;
		/* each iucv message contains a complete record */
		msg->msg_flags |= MSG_EOR;
	}
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	/* create control message to store iucv msg target class:
	 * get the trgcls from the control buffer of the skb due to
	 * fragmentation of original iucv message. */
	err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
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		       sizeof(IUCV_SKB_CB(skb)->class),
		       (void *)&IUCV_SKB_CB(skb)->class);
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	if (err) {
		if (!(flags & MSG_PEEK))
			skb_queue_head(&sk->sk_receive_queue, skb);
		return err;
	}

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	/* Mark read part of skb as used */
	if (!(flags & MSG_PEEK)) {

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		/* SOCK_STREAM: re-queue skb if it contains unreceived data */
		if (sk->sk_type == SOCK_STREAM) {
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			if (copied < rlen) {
				IUCV_SKB_CB(skb)->offset = offset + copied;
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				skb_queue_head(&sk->sk_receive_queue, skb);
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				goto done;
			}
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		}

		kfree_skb(skb);
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		if (iucv->transport == AF_IUCV_TRANS_HIPER) {
			atomic_inc(&iucv->msg_recv);
			if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
				WARN_ON(1);
				iucv_sock_close(sk);
				return -EFAULT;
			}
		}
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		/* Queue backlog skbs */
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		spin_lock_bh(&iucv->message_q.lock);
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		rskb = skb_dequeue(&iucv->backlog_skb_q);
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		while (rskb) {
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			IUCV_SKB_CB(rskb)->offset = 0;
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			if (__sock_queue_rcv_skb(sk, rskb)) {
				/* handle rcv queue full */
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				skb_queue_head(&iucv->backlog_skb_q,
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						rskb);
				break;
			}
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			rskb = skb_dequeue(&iucv->backlog_skb_q);
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		}
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		if (skb_queue_empty(&iucv->backlog_skb_q)) {
			if (!list_empty(&iucv->message_q.list))
				iucv_process_message_q(sk);
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			if (atomic_read(&iucv->msg_recv) >=
							iucv->msglimit / 2) {
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				err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
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				if (err) {
					sk->sk_state = IUCV_DISCONN;
					sk->sk_state_change(sk);
				}
			}
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		}
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		spin_unlock_bh(&iucv->message_q.lock);
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	}
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done:
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	/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
	if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
		copied = rlen;

	return copied;
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}

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static inline __poll_t iucv_accept_poll(struct sock *parent)
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{
	struct iucv_sock *isk, *n;
	struct sock *sk;

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	list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
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		sk = (struct sock *) isk;

		if (sk->sk_state == IUCV_CONNECTED)
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			return EPOLLIN | EPOLLRDNORM;
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	}

	return 0;
}

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__poll_t iucv_sock_poll(struct file *file, struct socket *sock,
			    poll_table *wait)
1504 1505
{
	struct sock *sk = sock->sk;
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	__poll_t mask = 0;
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1508
	sock_poll_wait(file, wait);
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	if (sk->sk_state == IUCV_LISTEN)
		return iucv_accept_poll(sk);

	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
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		mask |= EPOLLERR |
			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
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	if (sk->sk_shutdown & RCV_SHUTDOWN)
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		mask |= EPOLLRDHUP;
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	if (sk->sk_shutdown == SHUTDOWN_MASK)
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		mask |= EPOLLHUP;
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	if (!skb_queue_empty(&sk->sk_receive_queue) ||
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	    (sk->sk_shutdown & RCV_SHUTDOWN))
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		mask |= EPOLLIN | EPOLLRDNORM;
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	if (sk->sk_state == IUCV_CLOSED)
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		mask |= EPOLLHUP;
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1530
	if (sk->sk_state == IUCV_DISCONN)
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		mask |= EPOLLIN;
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1533
	if (sock_writeable(sk) && iucv_below_msglim(sk))
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		mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1535
	else
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		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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	return mask;
}

static int iucv_sock_shutdown(struct socket *sock, int how)
{
	struct sock *sk = sock->sk;
	struct iucv_sock *iucv = iucv_sk(sk);
	struct iucv_message txmsg;
	int err = 0;

	how++;

	if ((how & ~SHUTDOWN_MASK) || !how)
		return -EINVAL;

	lock_sock(sk);
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	switch (sk->sk_state) {
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	case IUCV_LISTEN:
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	case IUCV_DISCONN:
	case IUCV_CLOSING:
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	case IUCV_CLOSED:
		err = -ENOTCONN;
		goto fail;
	default:
		break;
	}

	if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
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		if (iucv->transport == AF_IUCV_TRANS_IUCV) {
			txmsg.class = 0;
			txmsg.tag = 0;
			err = pr_iucv->message_send(iucv->path, &txmsg,
				IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
			if (err) {
				switch (err) {
				case 1:
					err = -ENOTCONN;
					break;
				case 2:
					err = -ECONNRESET;
					break;
				default:
					err = -ENOTCONN;
					break;
				}
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			}
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		} else
			iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
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	}

1588
	sk->sk_shutdown |= how;
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	if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
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		if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
		    iucv->path) {
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			err = pr_iucv->path_quiesce(iucv->path, NULL);
			if (err)
				err = -ENOTCONN;
/*			skb_queue_purge(&sk->sk_receive_queue); */
		}
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		skb_queue_purge(&sk->sk_receive_queue);
	}

	/* Wake up anyone sleeping in poll */
	sk->sk_state_change(sk);

fail:
	release_sock(sk);
	return err;
}

static int iucv_sock_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	int err = 0;

	if (!sk)
		return 0;

	iucv_sock_close(sk);

	sock_orphan(sk);
	iucv_sock_kill(sk);
	return err;
}

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/* getsockopt and setsockopt */
static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1625
				char __user *optval, unsigned int optlen)
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{
	struct sock *sk = sock->sk;
	struct iucv_sock *iucv = iucv_sk(sk);
	int val;
	int rc;

	if (level != SOL_IUCV)
		return -ENOPROTOOPT;

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

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

	rc = 0;

	lock_sock(sk);
	switch (optname) {
	case SO_IPRMDATA_MSG:
		if (val)
			iucv->flags |= IUCV_IPRMDATA;
		else
			iucv->flags &= ~IUCV_IPRMDATA;
		break;
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	case SO_MSGLIMIT:
		switch (sk->sk_state) {
		case IUCV_OPEN:
		case IUCV_BOUND:
			if (val < 1 || val > (u16)(~0))
				rc = -EINVAL;
			else
				iucv->msglimit = val;
			break;
		default:
			rc = -EINVAL;
			break;
		}
		break;
1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
	default:
		rc = -ENOPROTOOPT;
		break;
	}
	release_sock(sk);

	return rc;
}

static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
				char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	struct iucv_sock *iucv = iucv_sk(sk);
1679 1680
	unsigned int val;
	int len;
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696

	if (level != SOL_IUCV)
		return -ENOPROTOOPT;

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

	if (len < 0)
		return -EINVAL;

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

	switch (optname) {
	case SO_IPRMDATA_MSG:
		val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
		break;
1697 1698 1699 1700 1701 1702
	case SO_MSGLIMIT:
		lock_sock(sk);
		val = (iucv->path != NULL) ? iucv->path->msglim	/* connected */
					   : iucv->msglimit;	/* default */
		release_sock(sk);
		break;
1703 1704 1705 1706 1707 1708 1709
	case SO_MSGSIZE:
		if (sk->sk_state == IUCV_OPEN)
			return -EBADFD;
		val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
				sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
				0x7fffffff;
		break;
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	default:
		return -ENOPROTOOPT;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}


1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
/* Callback wrappers - called from iucv base support */
static int iucv_callback_connreq(struct iucv_path *path,
				 u8 ipvmid[8], u8 ipuser[16])
{
	unsigned char user_data[16];
	unsigned char nuser_data[16];
	unsigned char src_name[8];
	struct sock *sk, *nsk;
	struct iucv_sock *iucv, *niucv;
	int err;

	memcpy(src_name, ipuser, 8);
	EBCASC(src_name, 8);
	/* Find out if this path belongs to af_iucv. */
	read_lock(&iucv_sk_list.lock);
	iucv = NULL;
1739
	sk = NULL;
1740
	sk_for_each(sk, &iucv_sk_list.head)
1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
		if (sk->sk_state == IUCV_LISTEN &&
		    !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
			/*
			 * Found a listening socket with
			 * src_name == ipuser[0-7].
			 */
			iucv = iucv_sk(sk);
			break;
		}
	read_unlock(&iucv_sk_list.lock);
	if (!iucv)
		/* No socket found, not one of our paths. */
		return -EINVAL;

	bh_lock_sock(sk);

	/* Check if parent socket is listening */
	low_nmcpy(user_data, iucv->src_name);
	high_nmcpy(user_data, iucv->dst_name);
	ASCEBC(user_data, sizeof(user_data));
	if (sk->sk_state != IUCV_LISTEN) {
1762
		err = pr_iucv->path_sever(path, user_data);
1763
		iucv_path_free(path);
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		goto fail;
	}

	/* Check for backlog size */
	if (sk_acceptq_is_full(sk)) {
1769
		err = pr_iucv->path_sever(path, user_data);
1770
		iucv_path_free(path);
1771 1772 1773 1774
		goto fail;
	}

	/* Create the new socket */
1775
	nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1776
	if (!nsk) {
1777
		err = pr_iucv->path_sever(path, user_data);
1778
		iucv_path_free(path);
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
		goto fail;
	}

	niucv = iucv_sk(nsk);
	iucv_sock_init(nsk, sk);

	/* Set the new iucv_sock */
	memcpy(niucv->dst_name, ipuser + 8, 8);
	EBCASC(niucv->dst_name, 8);
	memcpy(niucv->dst_user_id, ipvmid, 8);
	memcpy(niucv->src_name, iucv->src_name, 8);
	memcpy(niucv->src_user_id, iucv->src_user_id, 8);
	niucv->path = path;

	/* Call iucv_accept */
	high_nmcpy(nuser_data, ipuser + 8);
	memcpy(nuser_data + 8, niucv->src_name, 8);
	ASCEBC(nuser_data + 8, 8);

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	/* set message limit for path based on msglimit of accepting socket */
	niucv->msglimit = iucv->msglimit;
	path->msglim = iucv->msglimit;
1801
	err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1802
	if (err) {
1803
		iucv_sever_path(nsk, 1);
1804
		iucv_sock_kill(nsk);
1805 1806 1807 1808 1809 1810 1811
		goto fail;
	}

	iucv_accept_enqueue(sk, nsk);

	/* Wake up accept */
	nsk->sk_state = IUCV_CONNECTED;
1812
	sk->sk_data_ready(sk);
1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829
	err = 0;
fail:
	bh_unlock_sock(sk);
	return 0;
}

static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
{
	struct sock *sk = path->private;

	sk->sk_state = IUCV_CONNECTED;
	sk->sk_state_change(sk);
}

static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
{
	struct sock *sk = path->private;
1830
	struct iucv_sock *iucv = iucv_sk(sk);
1831 1832 1833
	struct sk_buff *skb;
	struct sock_msg_q *save_msg;
	int len;
1834

1835
	if (sk->sk_shutdown & RCV_SHUTDOWN) {
1836
		pr_iucv->message_reject(path, msg);
1837
		return;
1838
	}
1839

1840
	spin_lock(&iucv->message_q.lock);
1841

1842 1843 1844 1845 1846
	if (!list_empty(&iucv->message_q.list) ||
	    !skb_queue_empty(&iucv->backlog_skb_q))
		goto save_message;

	len = atomic_read(&sk->sk_rmem_alloc);
1847
	len += SKB_TRUESIZE(iucv_msg_length(msg));
1848 1849 1850
	if (len > sk->sk_rcvbuf)
		goto save_message;

1851
	skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1852 1853
	if (!skb)
		goto save_message;
1854

1855
	iucv_process_message(sk, skb, path, msg);
1856
	goto out_unlock;
1857

1858 1859
save_message:
	save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1860
	if (!save_msg)
1861
		goto out_unlock;
1862 1863
	save_msg->path = path;
	save_msg->msg = *msg;
1864

1865
	list_add_tail(&save_msg->list, &iucv->message_q.list);
1866 1867

out_unlock:
1868
	spin_unlock(&iucv->message_q.lock);
1869 1870 1871 1872 1873 1874
}

static void iucv_callback_txdone(struct iucv_path *path,
				 struct iucv_message *msg)
{
	struct sock *sk = path->private;
1875
	struct sk_buff *this = NULL;
1876 1877 1878 1879
	struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
	struct sk_buff *list_skb = list->next;
	unsigned long flags;

1880
	bh_lock_sock(sk);
1881
	if (!skb_queue_empty(list)) {
1882 1883
		spin_lock_irqsave(&list->lock, flags);

1884
		while (list_skb != (struct sk_buff *)list) {
1885
			if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1886 1887 1888
				this = list_skb;
				break;
			}
1889
			list_skb = list_skb->next;
1890 1891 1892
		}
		if (this)
			__skb_unlink(this, list);
1893 1894

		spin_unlock_irqrestore(&list->lock, flags);
1895

1896 1897 1898 1899 1900
		if (this) {
			kfree_skb(this);
			/* wake up any process waiting for sending */
			iucv_sock_wake_msglim(sk);
		}
1901
	}
1902

1903
	if (sk->sk_state == IUCV_CLOSING) {
1904 1905 1906 1907 1908
		if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
			sk->sk_state = IUCV_CLOSED;
			sk->sk_state_change(sk);
		}
	}
1909
	bh_unlock_sock(sk);
1910 1911 1912 1913 1914 1915 1916

}

static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
{
	struct sock *sk = path->private;

1917 1918 1919 1920 1921
	if (sk->sk_state == IUCV_CLOSED)
		return;

	bh_lock_sock(sk);
	iucv_sever_path(sk, 1);
1922
	sk->sk_state = IUCV_DISCONN;
1923 1924

	sk->sk_state_change(sk);
1925
	bh_unlock_sock(sk);
1926 1927
}

1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
/* called if the other communication side shuts down its RECV direction;
 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
 */
static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
{
	struct sock *sk = path->private;

	bh_lock_sock(sk);
	if (sk->sk_state != IUCV_CLOSED) {
		sk->sk_shutdown |= SEND_SHUTDOWN;
		sk->sk_state_change(sk);
	}
	bh_unlock_sock(sk);
}

1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984
/***************** HiperSockets transport callbacks ********************/
static void afiucv_swap_src_dest(struct sk_buff *skb)
{
	struct af_iucv_trans_hdr *trans_hdr =
				(struct af_iucv_trans_hdr *)skb->data;
	char tmpID[8];
	char tmpName[8];

	ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
	ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
	ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
	ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
	memcpy(tmpID, trans_hdr->srcUserID, 8);
	memcpy(tmpName, trans_hdr->srcAppName, 8);
	memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
	memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
	memcpy(trans_hdr->destUserID, tmpID, 8);
	memcpy(trans_hdr->destAppName, tmpName, 8);
	skb_push(skb, ETH_HLEN);
	memset(skb->data, 0, ETH_HLEN);
}

/**
 * afiucv_hs_callback_syn - react on received SYN
 **/
static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
{
	struct sock *nsk;
	struct iucv_sock *iucv, *niucv;
	struct af_iucv_trans_hdr *trans_hdr;
	int err;

	iucv = iucv_sk(sk);
	trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
	if (!iucv) {
		/* no sock - connection refused */
		afiucv_swap_src_dest(skb);
		trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
		err = dev_queue_xmit(skb);
		goto out;
	}

1985
	nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1986 1987 1988 1989 1990 1991 1992 1993
	bh_lock_sock(sk);
	if ((sk->sk_state != IUCV_LISTEN) ||
	    sk_acceptq_is_full(sk) ||
	    !nsk) {
		/* error on server socket - connection refused */
		afiucv_swap_src_dest(skb);
		trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
		err = dev_queue_xmit(skb);
1994
		iucv_sock_kill(nsk);
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
		bh_unlock_sock(sk);
		goto out;
	}

	niucv = iucv_sk(nsk);
	iucv_sock_init(nsk, sk);
	niucv->transport = AF_IUCV_TRANS_HIPER;
	niucv->msglimit = iucv->msglimit;
	if (!trans_hdr->window)
		niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
	else
		niucv->msglimit_peer = trans_hdr->window;
	memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
	memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
	memcpy(niucv->src_name, iucv->src_name, 8);
	memcpy(niucv->src_user_id, iucv->src_user_id, 8);
	nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2012 2013
	niucv->hs_dev = iucv->hs_dev;
	dev_hold(niucv->hs_dev);
2014 2015 2016 2017 2018 2019 2020 2021
	afiucv_swap_src_dest(skb);
	trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
	trans_hdr->window = niucv->msglimit;
	/* if receiver acks the xmit connection is established */
	err = dev_queue_xmit(skb);
	if (!err) {
		iucv_accept_enqueue(sk, nsk);
		nsk->sk_state = IUCV_CONNECTED;
2022
		sk->sk_data_ready(sk);
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	} else
		iucv_sock_kill(nsk);
	bh_unlock_sock(sk);

out:
	return NET_RX_SUCCESS;
}

/**
 * afiucv_hs_callback_synack() - react on received SYN-ACK
 **/
static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
{
	struct iucv_sock *iucv = iucv_sk(sk);
	struct af_iucv_trans_hdr *trans_hdr =
					(struct af_iucv_trans_hdr *)skb->data;

	if (!iucv)
		goto out;
	if (sk->sk_state != IUCV_BOUND)
		goto out;
	bh_lock_sock(sk);
	iucv->msglimit_peer = trans_hdr->window;
	sk->sk_state = IUCV_CONNECTED;
	sk->sk_state_change(sk);
	bh_unlock_sock(sk);
out:
	kfree_skb(skb);
	return NET_RX_SUCCESS;
}

/**
 * afiucv_hs_callback_synfin() - react on received SYN_FIN
 **/
static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
{
	struct iucv_sock *iucv = iucv_sk(sk);

	if (!iucv)
		goto out;
	if (sk->sk_state != IUCV_BOUND)
		goto out;
	bh_lock_sock(sk);
	sk->sk_state = IUCV_DISCONN;
	sk->sk_state_change(sk);
	bh_unlock_sock(sk);
out:
	kfree_skb(skb);
	return NET_RX_SUCCESS;
}

/**
 * afiucv_hs_callback_fin() - react on received FIN
 **/
static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
{
	struct iucv_sock *iucv = iucv_sk(sk);

	/* other end of connection closed */
2082 2083 2084 2085
	if (!iucv)
		goto out;
	bh_lock_sock(sk);
	if (sk->sk_state == IUCV_CONNECTED) {
2086
		sk->sk_state = IUCV_DISCONN;
2087 2088
		sk->sk_state_change(sk);
	}
2089 2090
	bh_unlock_sock(sk);
out:
2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131
	kfree_skb(skb);
	return NET_RX_SUCCESS;
}

/**
 * afiucv_hs_callback_win() - react on received WIN
 **/
static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
{
	struct iucv_sock *iucv = iucv_sk(sk);
	struct af_iucv_trans_hdr *trans_hdr =
					(struct af_iucv_trans_hdr *)skb->data;

	if (!iucv)
		return NET_RX_SUCCESS;

	if (sk->sk_state != IUCV_CONNECTED)
		return NET_RX_SUCCESS;

	atomic_sub(trans_hdr->window, &iucv->msg_sent);
	iucv_sock_wake_msglim(sk);
	return NET_RX_SUCCESS;
}

/**
 * afiucv_hs_callback_rx() - react on received data
 **/
static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
{
	struct iucv_sock *iucv = iucv_sk(sk);

	if (!iucv) {
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

	if (sk->sk_state != IUCV_CONNECTED) {
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

2132 2133 2134 2135 2136
	if (sk->sk_shutdown & RCV_SHUTDOWN) {
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

2137
	/* write stuff from iucv_msg to skb cb */
2138 2139 2140
	skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
	skb_reset_transport_header(skb);
	skb_reset_network_header(skb);
2141
	IUCV_SKB_CB(skb)->offset = 0;
2142 2143 2144 2145 2146 2147
	if (sk_filter(sk, skb)) {
		atomic_inc(&sk->sk_drops);	/* skb rejected by filter */
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

2148 2149
	spin_lock(&iucv->message_q.lock);
	if (skb_queue_empty(&iucv->backlog_skb_q)) {
2150
		if (__sock_queue_rcv_skb(sk, skb))
2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169
			/* handle rcv queue full */
			skb_queue_tail(&iucv->backlog_skb_q, skb);
	} else
		skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
	spin_unlock(&iucv->message_q.lock);
	return NET_RX_SUCCESS;
}

/**
 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
 *                   transport
 *                   called from netif RX softirq
 **/
static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
	struct packet_type *pt, struct net_device *orig_dev)
{
	struct sock *sk;
	struct iucv_sock *iucv;
	struct af_iucv_trans_hdr *trans_hdr;
2170
	int err = NET_RX_SUCCESS;
2171 2172
	char nullstring[8];

2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186
	if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
		WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
			  (int)skb->len,
			  (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}
	if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
		if (skb_linearize(skb)) {
			WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
				  (int)skb->len);
			kfree_skb(skb);
			return NET_RX_SUCCESS;
		}
2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
	skb_pull(skb, ETH_HLEN);
	trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
	EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
	EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
	EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
	EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
	memset(nullstring, 0, sizeof(nullstring));
	iucv = NULL;
	sk = NULL;
	read_lock(&iucv_sk_list.lock);
2197
	sk_for_each(sk, &iucv_sk_list.head) {
2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254
		if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
			if ((!memcmp(&iucv_sk(sk)->src_name,
				     trans_hdr->destAppName, 8)) &&
			    (!memcmp(&iucv_sk(sk)->src_user_id,
				     trans_hdr->destUserID, 8)) &&
			    (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
			    (!memcmp(&iucv_sk(sk)->dst_user_id,
				     nullstring, 8))) {
				iucv = iucv_sk(sk);
				break;
			}
		} else {
			if ((!memcmp(&iucv_sk(sk)->src_name,
				     trans_hdr->destAppName, 8)) &&
			    (!memcmp(&iucv_sk(sk)->src_user_id,
				     trans_hdr->destUserID, 8)) &&
			    (!memcmp(&iucv_sk(sk)->dst_name,
				     trans_hdr->srcAppName, 8)) &&
			    (!memcmp(&iucv_sk(sk)->dst_user_id,
				     trans_hdr->srcUserID, 8))) {
				iucv = iucv_sk(sk);
				break;
			}
		}
	}
	read_unlock(&iucv_sk_list.lock);
	if (!iucv)
		sk = NULL;

	/* no sock
	how should we send with no sock
	1) send without sock no send rc checking?
	2) introduce default sock to handle this cases

	 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
	 data -> send FIN
	 SYN|ACK, SYN|FIN, FIN -> no action? */

	switch (trans_hdr->flags) {
	case AF_IUCV_FLAG_SYN:
		/* connect request */
		err = afiucv_hs_callback_syn(sk, skb);
		break;
	case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
		/* connect request confirmed */
		err = afiucv_hs_callback_synack(sk, skb);
		break;
	case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
		/* connect request refused */
		err = afiucv_hs_callback_synfin(sk, skb);
		break;
	case (AF_IUCV_FLAG_FIN):
		/* close request */
		err = afiucv_hs_callback_fin(sk, skb);
		break;
	case (AF_IUCV_FLAG_WIN):
		err = afiucv_hs_callback_win(sk, skb);
2255 2256 2257 2258
		if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
			kfree_skb(skb);
			break;
		}
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		/* fall through and receive non-zero length data */
	case (AF_IUCV_FLAG_SHT):
		/* shutdown request */
		/* fall through and receive zero length data */
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	case 0:
		/* plain data frame */
2265
		IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2266 2267 2268
		err = afiucv_hs_callback_rx(sk, skb);
		break;
	default:
2269
		kfree_skb(skb);
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	}

	return err;
}

/**
 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
 *                                 transport
 **/
static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
					enum iucv_tx_notify n)
{
	struct sock *isk = skb->sk;
	struct sock *sk = NULL;
	struct iucv_sock *iucv = NULL;
	struct sk_buff_head *list;
	struct sk_buff *list_skb;
2287
	struct sk_buff *nskb;
2288 2289
	unsigned long flags;

2290
	read_lock_irqsave(&iucv_sk_list.lock, flags);
2291
	sk_for_each(sk, &iucv_sk_list.head)
2292 2293 2294 2295
		if (sk == isk) {
			iucv = iucv_sk(sk);
			break;
		}
2296
	read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2297

2298
	if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2299 2300 2301
		return;

	list = &iucv->send_skb_q;
2302
	spin_lock_irqsave(&list->lock, flags);
2303 2304
	if (skb_queue_empty(list))
		goto out_unlock;
2305 2306
	list_skb = list->next;
	nskb = list_skb->next;
2307 2308 2309 2310
	while (list_skb != (struct sk_buff *)list) {
		if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
			switch (n) {
			case TX_NOTIFY_OK:
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				__skb_unlink(list_skb, list);
				kfree_skb(list_skb);
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				iucv_sock_wake_msglim(sk);
				break;
			case TX_NOTIFY_PENDING:
				atomic_inc(&iucv->pendings);
				break;
			case TX_NOTIFY_DELAYED_OK:
2319
				__skb_unlink(list_skb, list);
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				atomic_dec(&iucv->pendings);
				if (atomic_read(&iucv->pendings) <= 0)
					iucv_sock_wake_msglim(sk);
2323
				kfree_skb(list_skb);
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				break;
			case TX_NOTIFY_UNREACHABLE:
			case TX_NOTIFY_DELAYED_UNREACHABLE:
			case TX_NOTIFY_TPQFULL: /* not yet used */
			case TX_NOTIFY_GENERALERROR:
			case TX_NOTIFY_DELAYED_GENERALERROR:
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				__skb_unlink(list_skb, list);
				kfree_skb(list_skb);
				if (sk->sk_state == IUCV_CONNECTED) {
					sk->sk_state = IUCV_DISCONN;
					sk->sk_state_change(sk);
				}
2336 2337 2338 2339
				break;
			}
			break;
		}
2340 2341
		list_skb = nskb;
		nskb = nskb->next;
2342
	}
2343
out_unlock:
2344 2345
	spin_unlock_irqrestore(&list->lock, flags);

2346 2347 2348 2349 2350 2351 2352
	if (sk->sk_state == IUCV_CLOSING) {
		if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
			sk->sk_state = IUCV_CLOSED;
			sk->sk_state_change(sk);
		}
	}

2353
}
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/*
 * afiucv_netdev_event: handle netdev notifier chain events
 */
static int afiucv_netdev_event(struct notifier_block *this,
			       unsigned long event, void *ptr)
{
2361
	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
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	struct sock *sk;
	struct iucv_sock *iucv;

	switch (event) {
	case NETDEV_REBOOT:
	case NETDEV_GOING_DOWN:
2368
		sk_for_each(sk, &iucv_sk_list.head) {
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			iucv = iucv_sk(sk);
			if ((iucv->hs_dev == event_dev) &&
			    (sk->sk_state == IUCV_CONNECTED)) {
				if (event == NETDEV_GOING_DOWN)
					iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
				sk->sk_state = IUCV_DISCONN;
				sk->sk_state_change(sk);
			}
		}
		break;
	case NETDEV_DOWN:
	case NETDEV_UNREGISTER:
	default:
		break;
	}
	return NOTIFY_DONE;
}

static struct notifier_block afiucv_netdev_notifier = {
	.notifier_call = afiucv_netdev_event,
};

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static const struct proto_ops iucv_sock_ops = {
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	.family		= PF_IUCV,
	.owner		= THIS_MODULE,
	.release	= iucv_sock_release,
	.bind		= iucv_sock_bind,
	.connect	= iucv_sock_connect,
	.listen		= iucv_sock_listen,
	.accept		= iucv_sock_accept,
	.getname	= iucv_sock_getname,
	.sendmsg	= iucv_sock_sendmsg,
	.recvmsg	= iucv_sock_recvmsg,
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	.poll		= iucv_sock_poll,
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	.ioctl		= sock_no_ioctl,
	.mmap		= sock_no_mmap,
	.socketpair	= sock_no_socketpair,
	.shutdown	= iucv_sock_shutdown,
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	.setsockopt	= iucv_sock_setsockopt,
	.getsockopt	= iucv_sock_getsockopt,
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};

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static const struct net_proto_family iucv_sock_family_ops = {
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	.family	= AF_IUCV,
	.owner	= THIS_MODULE,
	.create	= iucv_sock_create,
};

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static struct packet_type iucv_packet_type = {
	.type = cpu_to_be16(ETH_P_AF_IUCV),
	.func = afiucv_hs_rcv,
};

static int afiucv_iucv_init(void)
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{
	int err;

	err = pr_iucv->iucv_register(&af_iucv_handler, 0);
	if (err)
		goto out;
	/* establish dummy device */
	af_iucv_driver.bus = pr_iucv->bus;
	err = driver_register(&af_iucv_driver);
	if (err)
		goto out_iucv;
	af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
	if (!af_iucv_dev) {
		err = -ENOMEM;
		goto out_driver;
	}
	dev_set_name(af_iucv_dev, "af_iucv");
	af_iucv_dev->bus = pr_iucv->bus;
	af_iucv_dev->parent = pr_iucv->root;
	af_iucv_dev->release = (void (*)(struct device *))kfree;
	af_iucv_dev->driver = &af_iucv_driver;
	err = device_register(af_iucv_dev);
	if (err)
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		goto out_iucv_dev;
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	return 0;

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out_iucv_dev:
	put_device(af_iucv_dev);
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out_driver:
	driver_unregister(&af_iucv_driver);
out_iucv:
	pr_iucv->iucv_unregister(&af_iucv_handler, 0);
out:
	return err;
}

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static int __init afiucv_init(void)
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{
	int err;

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	if (MACHINE_IS_VM) {
		cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
		if (unlikely(err)) {
			WARN_ON(err);
			err = -EPROTONOSUPPORT;
			goto out;
		}
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		pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
		if (!pr_iucv) {
			printk(KERN_WARNING "iucv_if lookup failed\n");
			memset(&iucv_userid, 0, sizeof(iucv_userid));
		}
	} else {
		memset(&iucv_userid, 0, sizeof(iucv_userid));
		pr_iucv = NULL;
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	}

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	err = proto_register(&iucv_proto, 0);
	if (err)
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		goto out;
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	err = sock_register(&iucv_sock_family_ops);
	if (err)
		goto out_proto;
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	if (pr_iucv) {
		err = afiucv_iucv_init();
		if (err)
			goto out_sock;
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	} else
		register_netdevice_notifier(&afiucv_netdev_notifier);
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	dev_add_pack(&iucv_packet_type);
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	return 0;

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out_sock:
	sock_unregister(PF_IUCV);
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out_proto:
	proto_unregister(&iucv_proto);
out:
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	if (pr_iucv)
		symbol_put(iucv_if);
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	return err;
}

static void __exit afiucv_exit(void)
{
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	if (pr_iucv) {
		device_unregister(af_iucv_dev);
		driver_unregister(&af_iucv_driver);
		pr_iucv->iucv_unregister(&af_iucv_handler, 0);
		symbol_put(iucv_if);
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	} else
		unregister_netdevice_notifier(&afiucv_netdev_notifier);
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	dev_remove_pack(&iucv_packet_type);
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	sock_unregister(PF_IUCV);
	proto_unregister(&iucv_proto);
}

module_init(afiucv_init);
module_exit(afiucv_exit);

MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_IUCV);