Commit message: iucv: Fix missing msg_namelen update in iucv_sock_recvmsg()

The current code does not fill the msg_name member in case it is set.
It also does not set the msg_namelen member to 0 and therefore makes
net/socket.c leak the local, uninitialized sockaddr_storage variable
to userland -- 128 bytes of kernel stack memory.

Fix that by simply setting msg_namelen to 0 as obviously nobody cared
about iucv_sock_recvmsg() not filling the msg_name in case it was set.

Cc: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
CVE: CVE-2013-3229
CWE: CWE-200
Vulnerability description: The iucv_sock_recvmsg function in net/iucv/af_iucv.c in the Linux kernel before 3.9-rc7 does not initialize a certain length variable, which allows local users to obtain sensitive information from kernel stack memory via a crafted recvmsg or recvfrom system call.

Project: linux
File: af_iucv.c

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

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

	return NULL;
}

Project: linux
File: af_iucv.c

static void __exit afiucv_exit(void)
{
	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);
	} else
		unregister_netdevice_notifier(&afiucv_netdev_notifier);
	dev_remove_pack(&iucv_packet_type);
	sock_unregister(PF_IUCV);
	proto_unregister(&iucv_proto);
}

Project: linux
File: af_iucv.c

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

Project: linux
File: af_iucv.c

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;
	}

	if (sk->sk_shutdown & RCV_SHUTDOWN) {
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

		/* write stuff from iucv_msg to skb cb */
	if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}
	skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
	skb_reset_transport_header(skb);
	skb_reset_network_header(skb);
	spin_lock(&iucv->message_q.lock);
	if (skb_queue_empty(&iucv->backlog_skb_q)) {
		if (sock_queue_rcv_skb(sk, skb)) {
			/* 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;
}

Project: linux
File: af_iucv.c

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;
	}

	nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
	bh_lock_sock(sk);
	if ((sk->sk_state != IUCV_LISTEN) ||
	    sk_acceptq_is_full(sk) ||
	    !nsk) {
		/* error on server socket - connection refused */
		if (nsk)
			sk_free(nsk);
		afiucv_swap_src_dest(skb);
		trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
		err = dev_queue_xmit(skb);
		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;
	niucv->hs_dev = iucv->hs_dev;
	dev_hold(niucv->hs_dev);
	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;
		sk->sk_data_ready(sk, 1);
	} else
		iucv_sock_kill(nsk);
	bh_unlock_sock(sk);

out:
	return NET_RX_SUCCESS;
}

Project: linux
File: af_iucv.c

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;
}

Project: linux
File: af_iucv.c

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;
}

Project: linux
File: af_iucv.c

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;
	struct sk_buff *nskb;
	unsigned long flags;

	read_lock_irqsave(&iucv_sk_list.lock, flags);
	sk_for_each(sk, &iucv_sk_list.head)
		if (sk == isk) {
			iucv = iucv_sk(sk);
			break;
		}
	read_unlock_irqrestore(&iucv_sk_list.lock, flags);

	if (!iucv || sock_flag(sk, SOCK_ZAPPED))
		return;

	list = &iucv->send_skb_q;
	spin_lock_irqsave(&list->lock, flags);
	if (skb_queue_empty(list))
		goto out_unlock;
	list_skb = list->next;
	nskb = list_skb->next;
	while (list_skb != (struct sk_buff *)list) {
		if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
			switch (n) {
			case TX_NOTIFY_OK:
				__skb_unlink(list_skb, list);
				kfree_skb(list_skb);
				iucv_sock_wake_msglim(sk);
				break;
			case TX_NOTIFY_PENDING:
				atomic_inc(&iucv->pendings);
				break;
			case TX_NOTIFY_DELAYED_OK:
				__skb_unlink(list_skb, list);
				atomic_dec(&iucv->pendings);
				if (atomic_read(&iucv->pendings) <= 0)
					iucv_sock_wake_msglim(sk);
				kfree_skb(list_skb);
				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:
				__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);
				}
				break;
			}
			break;
		}
		list_skb = nskb;
		nskb = nskb->next;
	}
out_unlock:
	spin_unlock_irqrestore(&list->lock, flags);

	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);
		}
	}

}

Project: linux
File: af_iucv.c

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;
}

Project: linux
File: af_iucv.c

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;
	char nullstring[8];
	int err = 0;

	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);
	sk_for_each(sk, &iucv_sk_list.head) {
		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);
		if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
			kfree_skb(skb);
			break;
		}
		/* fall through and receive non-zero length data */
	case (AF_IUCV_FLAG_SHT):
		/* shutdown request */
		/* fall through and receive zero length data */
	case 0:
		/* plain data frame */
		memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class,
		       CB_TRGCLS_LEN);
		err = afiucv_hs_callback_rx(sk, skb);
		break;
	default:
		;
	}

	return err;
}

Project: linux
File: af_iucv.c

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);
	phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
					sizeof(struct af_iucv_trans_hdr));
	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));

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

Project: linux
File: af_iucv.c

static int __init afiucv_init(void)
{
	int err;

	if (MACHINE_IS_VM) {
		cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
		if (unlikely(err)) {
			WARN_ON(err);
			err = -EPROTONOSUPPORT;
			goto out;
		}

		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;
	}

	err = proto_register(&iucv_proto, 0);
	if (err)
		goto out;
	err = sock_register(&iucv_sock_family_ops);
	if (err)
		goto out_proto;

	if (pr_iucv) {
		err = afiucv_iucv_init();
		if (err)
			goto out_sock;
	} else
		register_netdevice_notifier(&afiucv_netdev_notifier);
	dev_add_pack(&iucv_packet_type);
	return 0;

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

Project: linux
File: af_iucv.c

static int afiucv_iucv_init(void)
{
	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)
		goto out_driver;
	return 0;

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

Project: linux
File: af_iucv.c

static int afiucv_netdev_event(struct notifier_block *this,
			       unsigned long event, void *ptr)
{
	struct net_device *event_dev = (struct net_device *)ptr;
	struct sock *sk;
	struct iucv_sock *iucv;

	switch (event) {
	case NETDEV_REBOOT:
	case NETDEV_GOING_DOWN:
		sk_for_each(sk, &iucv_sk_list.head) {
			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;
}

Project: linux
File: af_iucv.c

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

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

	/* Create path. */
	iucv->path = iucv_path_alloc(iucv->msglimit,
				     IUCV_IPRMDATA, GFP_KERNEL);
	if (!iucv->path) {
		err = -ENOMEM;
		goto done;
	}
	err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
				    sa->siucv_user_id, NULL, user_data,
				    sk);
	if (err) {
		iucv_path_free(iucv->path);
		iucv->path = NULL;
		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;
		}
	}
done:
	return err;
}

Project: linux
File: af_iucv.c

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

Project: linux
File: af_iucv.c

static int afiucv_pm_freeze(struct device *dev)
{
	struct iucv_sock *iucv;
	struct sock *sk;
	int err = 0;

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

Project: linux
File: af_iucv.c

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);
	sk_for_each(sk, &iucv_sk_list.head) {
		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;
}

Project: linux
File: af_iucv.c

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);
}

Project: linux
File: af_iucv.c

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

Project: linux
File: af_iucv.c

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

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

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

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

			release_sock(sk);
			return sk;
		}

		release_sock(sk);
	}
	return NULL;
}

Project: linux
File: af_iucv.c

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

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

		if (sk->sk_state == IUCV_CONNECTED)
			return POLLIN | POLLRDNORM;
	}

	return 0;
}

Project: linux
File: af_iucv.c

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

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

Project: linux
File: af_iucv.c

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);
}

Project: linux
File: af_iucv.c

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

	if (sk->sk_state == IUCV_CLOSED)
		return;

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

	sk->sk_state_change(sk);
	bh_unlock_sock(sk);
}

Project: linux
File: af_iucv.c

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;
	sk = NULL;
	sk_for_each(sk, &iucv_sk_list.head)
		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) {
		err = pr_iucv->path_sever(path, user_data);
		iucv_path_free(path);
		goto fail;
	}

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

	/* Create the new socket */
	nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
	if (!nsk) {
		err = pr_iucv->path_sever(path, user_data);
		iucv_path_free(path);
		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);

	/* set message limit for path based on msglimit of accepting socket */
	niucv->msglimit = iucv->msglimit;
	path->msglim = iucv->msglimit;
	err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
	if (err) {
		iucv_sever_path(nsk, 1);
		iucv_sock_kill(nsk);
		goto fail;
	}

	iucv_accept_enqueue(sk, nsk);

	/* Wake up accept */
	nsk->sk_state = IUCV_CONNECTED;
	sk->sk_data_ready(sk, 1);
	err = 0;
fail:
	bh_unlock_sock(sk);
	return 0;
}

Project: linux
File: af_iucv.c

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);
}

Project: linux
File: af_iucv.c

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

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

		while (list_skb != (struct sk_buff *)list) {
			if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
				this = list_skb;
				break;
			}
			list_skb = list_skb->next;
		}
		if (this)
			__skb_unlink(this, list);

		spin_unlock_irqrestore(&list->lock, flags);

		if (this) {
			kfree_skb(this);
			/* wake up any process waiting for sending */
			iucv_sock_wake_msglim(sk);
		}
	}

	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);
		}
	}
	bh_unlock_sock(sk);

}

Project: linux
File: af_iucv.c

static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
{
	int dataleft, size, copied = 0;
	struct sk_buff *nskb;

	dataleft = len;
	while (dataleft) {
		if (dataleft >= sk->sk_rcvbuf / 4)
			size = sk->sk_rcvbuf / 4;
		else
			size = dataleft;

		nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
		if (!nskb)
			return -ENOMEM;

		/* copy target class to control buffer of new skb */
		memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);

		/* copy data fragment */
		memcpy(nskb->data, skb->data + copied, size);
		copied += size;
		dataleft -= size;

		skb_reset_transport_header(nskb);
		skb_reset_network_header(nskb);
		nskb->len = size;

		skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
	}

	return 0;
}

Project: linux
File: af_iucv.c

static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
				 struct iucv_path *path,
				 struct iucv_message *msg)
{
	int rc;
	unsigned int len;

	len = iucv_msg_length(msg);

	/* store msg target class in the second 4 bytes of skb ctrl buffer */
	/* Note: the first 4 bytes are reserved for msg tag */
	memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);

	/* 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;
		}
	} else {
		rc = pr_iucv->message_receive(path, msg,
					      msg->flags & IUCV_IPRMDATA,
					      skb->data, len, NULL);
		if (rc) {
			kfree_skb(skb);
			return;
		}
		/* we need to fragment iucv messages for SOCK_STREAM only;
		 * for SOCK_SEQPACKET, it is only relevant if we support
		 * record segmentation using MSG_EOR (see also recvmsg()) */
		if (sk->sk_type == SOCK_STREAM &&
		    skb->truesize >= sk->sk_rcvbuf / 4) {
			rc = iucv_fragment_skb(sk, skb, len);
			kfree_skb(skb);
			skb = NULL;
			if (rc) {
				pr_iucv->path_sever(path, NULL);
				return;
			}
			skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
		} else {
			skb_reset_transport_header(skb);
			skb_reset_network_header(skb);
			skb->len = len;
		}
	}

	if (sock_queue_rcv_skb(sk, skb))
		skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
}

Project: linux
File: af_iucv.c

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) {
		skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
		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;
	}
}

Project: linux
File: af_iucv.c

static int iucv_send_ctrl(struct sock *sk, u8 flags)
{
	int err = 0;
	int blen;
	struct sk_buff *skb;

	blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
	skb = sock_alloc_send_skb(sk, blen, 1, &err);
	if (skb) {
		skb_reserve(skb, blen);
		err = afiucv_hs_send(NULL, sk, skb, flags);
	}
	return err;
}

Project: linux
File: af_iucv.c

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;
	return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
				 (void *) prmdata, 8);
}

Project: linux
File: af_iucv.c

static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
			    int flags)
{
	DECLARE_WAITQUEUE(wait, current);
	struct sock *sk = sock->sk, *nsk;
	long timeo;
	int err = 0;

	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);

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

	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);

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

		release_sock(sk);
		timeo = schedule_timeout(timeo);
		lock_sock_nested(sk, SINGLE_DEPTH_NESTING);

		if (sk->sk_state != IUCV_LISTEN) {
			err = -EBADFD;
			break;
		}

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

	set_current_state(TASK_RUNNING);
	remove_wait_queue(sk_sleep(sk), &wait);

	if (err)
		goto done;

	newsock->state = SS_CONNECTED;

done:
	release_sock(sk);
	return err;
}

Project: linux
File: af_iucv.c

static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
{
	struct sock *sk;
	struct iucv_sock *iucv;

	sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
	if (!sk)
		return NULL;
	iucv = iucv_sk(sk);

	sock_init_data(sock, sk);
	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;
	atomic_set(&iucv->pendings, 0);
	iucv->flags = 0;
	iucv->msglimit = 0;
	atomic_set(&iucv->msg_sent, 0);
	atomic_set(&iucv->msg_recv, 0);
	iucv->path = NULL;
	iucv->sk_txnotify = afiucv_hs_callback_txnotify;
	memset(&iucv->src_user_id , 0, 32);
	if (pr_iucv)
		iucv->transport = AF_IUCV_TRANS_IUCV;
	else
		iucv->transport = AF_IUCV_TRANS_HIPER;

	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;
}

Project: linux
File: af_iucv.c

static int iucv_sock_autobind(struct sock *sk)
{
	struct iucv_sock *iucv = iucv_sk(sk);
	char name[12];
	int err = 0;

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

	memcpy(iucv->src_user_id, iucv_userid, 8);

	write_lock_bh(&iucv_sk_list.lock);

	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));
	}

	write_unlock_bh(&iucv_sk_list.lock);

	memcpy(&iucv->src_name, name, 8);

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

	return err;
}

Project: linux
File: af_iucv.c

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;
	int err = 0;
	struct net_device *dev;
	char uid[9];

	/* Verify the input sockaddr */
	if (!addr || addr->sa_family != AF_IUCV)
		return -EINVAL;

	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;
	}
	if (iucv->path)
		goto done_unlock;

	/* Bind the socket */
	if (pr_iucv)
		if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
			goto vm_bind; /* VM IUCV transport */

	/* 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_name, sa->siucv_name, 8);
			memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
			sk->sk_bound_dev_if = dev->ifindex;
			iucv->hs_dev = dev;
			dev_hold(dev);
			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;
done_unlock:
	/* Release the socket list lock */
	write_unlock_bh(&iucv_sk_list.lock);
done:
	release_sock(sk);
	return err;
}

Project: linux
File: af_iucv.c

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;
}

Project: linux
File: af_iucv.c

static void iucv_sock_close(struct sock *sk)
{
	struct iucv_sock *iucv = iucv_sk(sk);
	unsigned long timeo;
	int err = 0;

	lock_sock(sk);

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

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

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

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

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

		skb_queue_purge(&iucv->send_skb_q);
		skb_queue_purge(&iucv->backlog_skb_q);

	default:   /* fall through */
		iucv_sever_path(sk, 1);
	}

	if (iucv->hs_dev) {
		dev_put(iucv->hs_dev);
		iucv->hs_dev = NULL;
		sk->sk_bound_dev_if = 0;
	}

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

	release_sock(sk);
}

Project: linux
File: af_iucv.c

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;

	if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
		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)
		err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
	else
		err = afiucv_path_connect(sock, addr);
	if (err)
		goto done;

	if (sk->sk_state != IUCV_CONNECTED)
		err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
							    IUCV_DISCONN),
				     sock_sndtimeo(sk, flags & O_NONBLOCK));

	if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
		err = -ECONNREFUSED;

	if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
		iucv_sever_path(sk, 0);

done:
	release_sock(sk);
	return err;
}

Project: linux
File: af_iucv.c

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

	if (protocol && protocol != PF_IUCV)
		return -EPROTONOSUPPORT;

	sock->state = SS_UNCONNECTED;

	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;
	}

	sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
	if (!sk)
		return -ENOMEM;

	iucv_sock_init(sk, NULL);

	return 0;
}

Project: linux
File: af_iucv.c

static void iucv_sock_destruct(struct sock *sk)
{
	skb_queue_purge(&sk->sk_receive_queue);
	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));
	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
	WARN_ON(sk->sk_wmem_queued);
	WARN_ON(sk->sk_forward_alloc);
}

Project: linux
File: af_iucv.c

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);
	unsigned int val;
	int len;

	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;
	case SO_MSGLIMIT:
		lock_sock(sk);
		val = (iucv->path != NULL) ? iucv->path->msglim	/* connected */
					   : iucv->msglimit;	/* default */
		release_sock(sk);
		break;
	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;
	default:
		return -ENOPROTOOPT;
	}

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

	return 0;
}

Project: linux
File: af_iucv.c

static int iucv_sock_in_state(struct sock *sk, int state, int state2)
{
	return (sk->sk_state == state || sk->sk_state == state2);
}

Project: linux
File: af_iucv.c

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

Project: linux
File: af_iucv.c

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);
}

Project: linux
File: af_iucv.c

static int iucv_sock_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
	int err;

	lock_sock(sk);

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

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

Project: linux
File: af_iucv.c

unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
			    poll_table *wait)
{
	struct sock *sk = sock->sk;
	unsigned int mask = 0;

	sock_poll_wait(file, sk_sleep(sk), wait);

	if (sk->sk_state == IUCV_LISTEN)
		return iucv_accept_poll(sk);

	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
		mask |= POLLERR;

	if (sk->sk_shutdown & RCV_SHUTDOWN)
		mask |= POLLRDHUP;

	if (sk->sk_shutdown == SHUTDOWN_MASK)
		mask |= POLLHUP;

	if (!skb_queue_empty(&sk->sk_receive_queue) ||
	    (sk->sk_shutdown & RCV_SHUTDOWN))
		mask |= POLLIN | POLLRDNORM;

	if (sk->sk_state == IUCV_CLOSED)
		mask |= POLLHUP;

	if (sk->sk_state == IUCV_DISCONN)
		mask |= POLLIN;

	if (sock_writeable(sk) && iucv_below_msglim(sk))
		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
	else
		set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);

	return mask;
}

Project: linux
File: af_iucv.c

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;
}

Project: linux
File: af_iucv.c

static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
			     struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct iucv_sock *iucv = iucv_sk(sk);
	struct sk_buff *skb;
	struct iucv_message txmsg;
	struct cmsghdr *cmsg;
	int cmsg_done;
	long timeo;
	char user_id[9];
	char appl_id[9];
	int err;
	int noblock = msg->msg_flags & MSG_DONTWAIT;

	err = sock_error(sk);
	if (err)
		return err;

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

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

	lock_sock(sk);

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

	/* Return if the socket is not in connected state */
	if (sk->sk_state != IUCV_CONNECTED) {
		err = -ENOTCONN;
		goto out;
	}

	/* initialize defaults */
	cmsg_done   = 0;	/* check for duplicate headers */
	txmsg.class = 0;

	/* iterate over control messages */
	for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
		cmsg = CMSG_NXTHDR(msg, cmsg)) {

		if (!CMSG_OK(msg, cmsg)) {
			err = -EINVAL;
			goto out;
		}

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

		if (cmsg->cmsg_type & cmsg_done) {
			err = -EINVAL;
			goto out;
		}
		cmsg_done |= cmsg->cmsg_type;

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

			/* set iucv message target class */
			memcpy(&txmsg.class,
				(void *) CMSG_DATA(cmsg), TRGCLS_SIZE);

			break;

		default:
			err = -EINVAL;
			goto out;
			break;
		}
	}

	/* 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 */
	if (iucv->transport == AF_IUCV_TRANS_HIPER)
		skb = sock_alloc_send_skb(sk,
			len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
			noblock, &err);
	else
		skb = sock_alloc_send_skb(sk, len, noblock, &err);
	if (!skb) {
		err = -ENOMEM;
		goto out;
	}
	if (iucv->transport == AF_IUCV_TRANS_HIPER)
		skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
	if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
		err = -EFAULT;
		goto fail;
	}

	/* 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;

	/* return -ECONNRESET if the socket is no longer connected */
	if (sk->sk_state != IUCV_CONNECTED) {
		err = -ECONNRESET;
		goto fail;
	}

	/* increment and save iucv message tag for msg_completion cbk */
	txmsg.tag = iucv->send_tag++;
	memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);

	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);
			goto fail;
		}
		goto release;
	}
	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);
		}

		/* 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
		err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
					(void *) skb->data, skb->len);
	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;
		skb_unlink(skb, &iucv->send_skb_q);
		goto fail;
	}

release:
	release_sock(sk);
	return len;

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

Project: linux
File: af_iucv.c

static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
				char __user *optval, unsigned int optlen)
{
	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;
	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;
	default:
		rc = -ENOPROTOOPT;
		break;
	}
	release_sock(sk);

	return rc;
}

Project: linux
File: af_iucv.c

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

	if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
		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;
				}
			}
		} else
			iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
	}

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

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

fail:
	release_sock(sk);
	return err;
}

Project: linux
File: af_iucv.c

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);
}

Project: linux
File: af_iucv.c

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