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-rw-r--r--net/iucv/Kconfig17
-rw-r--r--net/iucv/Makefile6
-rw-r--r--net/iucv/af_iucv.c2551
-rw-r--r--net/iucv/iucv.c2107
4 files changed, 4681 insertions, 0 deletions
diff --git a/net/iucv/Kconfig b/net/iucv/Kconfig
new file mode 100644
index 000000000..497fbe732
--- /dev/null
+++ b/net/iucv/Kconfig
@@ -0,0 +1,17 @@
+config IUCV
+ depends on S390
+ def_tristate y if S390
+ prompt "IUCV support (S390 - z/VM only)"
+ help
+ Select this option if you want to use inter-user communication
+ under VM or VIF. If you run on z/VM, say "Y" to enable a fast
+ communication link between VM guests.
+
+config AFIUCV
+ depends on S390
+ def_tristate m if QETH_L3 || IUCV
+ prompt "AF_IUCV Socket support (S390 - z/VM and HiperSockets transport)"
+ help
+ Select this option if you want to use AF_IUCV socket applications
+ based on z/VM inter-user communication vehicle or based on
+ HiperSockets.
diff --git a/net/iucv/Makefile b/net/iucv/Makefile
new file mode 100644
index 000000000..7bfdc8532
--- /dev/null
+++ b/net/iucv/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for IUCV
+#
+
+obj-$(CONFIG_IUCV) += iucv.o
+obj-$(CONFIG_AFIUCV) += af_iucv.o
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
new file mode 100644
index 000000000..d59f2341b
--- /dev/null
+++ b/net/iucv/af_iucv.c
@@ -0,0 +1,2551 @@
+/*
+ * IUCV protocol stack for Linux on zSeries
+ *
+ * Copyright IBM Corp. 2006, 2009
+ *
+ * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
+ * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
+ * PM functions:
+ * Ursula Braun <ursula.braun@de.ibm.com>
+ */
+
+#define KMSG_COMPONENT "af_iucv"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/security.h>
+#include <net/sock.h>
+#include <asm/ebcdic.h>
+#include <asm/cpcmd.h>
+#include <linux/kmod.h>
+
+#include <net/iucv/af_iucv.h>
+
+#define VERSION "1.2"
+
+static char iucv_userid[80];
+
+static const struct proto_ops iucv_sock_ops;
+
+static struct proto iucv_proto = {
+ .name = "AF_IUCV",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct iucv_sock),
+};
+
+static struct iucv_interface *pr_iucv;
+
+/* special AF_IUCV IPRM messages */
+static const u8 iprm_shutdown[8] =
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
+
+#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
+
+#define __iucv_sock_wait(sk, condition, timeo, ret) \
+do { \
+ DEFINE_WAIT(__wait); \
+ long __timeo = timeo; \
+ ret = 0; \
+ prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
+ 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; \
+ } \
+ finish_wait(sk_sleep(sk), &__wait); \
+} while (0)
+
+#define iucv_sock_wait(sk, condition, timeo) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) \
+ __iucv_sock_wait(sk, condition, timeo, __ret); \
+ __ret; \
+})
+
+static void iucv_sock_kill(struct sock *sk);
+static void iucv_sock_close(struct sock *sk);
+static void iucv_sever_path(struct sock *, int);
+
+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);
+
+/* 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 *);
+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 *);
+
+static struct iucv_sock_list iucv_sk_list = {
+ .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
+ .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,
+ .message_complete = iucv_callback_txdone,
+ .path_quiesced = iucv_callback_shutdown,
+};
+
+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);
+}
+
+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);
+ 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 0;
+}
+
+/**
+ * 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);
+ 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;
+}
+
+static const struct dev_pm_ops afiucv_pm_ops = {
+ .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",
+ .bus = NULL,
+ .pm = &afiucv_pm_ops,
+};
+
+/* dummy device used as trigger for PM functions */
+static struct device *af_iucv_dev;
+
+/**
+ * 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])
+ *
+ * The socket data length is computed by subtracting the socket data length
+ * 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;
+}
+
+/**
+ * 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;
+ 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));
+}
+
+/**
+ * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
+ */
+static void iucv_sock_wake_msglim(struct sock *sk)
+{
+ struct socket_wq *wq;
+
+ rcu_read_lock();
+ wq = rcu_dereference(sk->sk_wq);
+ if (skwq_has_sleeper(wq))
+ wake_up_interruptible_all(&wq->wait);
+ sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+ rcu_read_unlock();
+}
+
+/**
+ * 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);
+ phs_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) {
+ err = -ENODEV;
+ goto err_free;
+ }
+
+ dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
+
+ if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
+ err = -ENETDOWN;
+ goto err_free;
+ }
+ if (skb->len > skb->dev->mtu) {
+ if (sock->sk_type == SOCK_SEQPACKET) {
+ err = -EMSGSIZE;
+ goto err_free;
+ }
+ skb_trim(skb, skb->dev->mtu);
+ }
+ skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
+
+ __skb_header_release(skb);
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (!nskb) {
+ err = -ENOMEM;
+ goto err_free;
+ }
+
+ 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);
+
+err_free:
+ kfree_skb(skb);
+ return err;
+}
+
+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;
+}
+
+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(refcount_read(&sk->sk_wmem_alloc));
+ WARN_ON(sk->sk_wmem_queued);
+ WARN_ON(sk->sk_forward_alloc);
+}
+
+/* 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;
+}
+
+/* Kill socket (only if zapped and orphaned) */
+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);
+}
+
+/* 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);
+ }
+}
+
+/* Send controlling flags through an IUCV socket for HIPER transport */
+static int iucv_send_ctrl(struct sock *sk, u8 flags)
+{
+ struct iucv_sock *iucv = iucv_sk(sk);
+ int err = 0;
+ int blen;
+ struct sk_buff *skb;
+ u8 shutdown = 0;
+
+ blen = sizeof(struct af_iucv_trans_hdr) +
+ LL_RESERVED_SPACE(iucv->hs_dev);
+ if (sk->sk_shutdown & SEND_SHUTDOWN) {
+ /* controlling flags should be sent anyway */
+ shutdown = sk->sk_shutdown;
+ sk->sk_shutdown &= RCV_SHUTDOWN;
+ }
+ skb = sock_alloc_send_skb(sk, blen, 1, &err);
+ if (skb) {
+ skb_reserve(skb, blen);
+ err = afiucv_hs_send(NULL, sk, skb, flags);
+ }
+ if (shutdown)
+ sk->sk_shutdown = shutdown;
+ return err;
+}
+
+/* Close an IUCV socket */
+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);
+}
+
+static void iucv_sock_init(struct sock *sk, struct sock *parent)
+{
+ if (parent) {
+ sk->sk_type = parent->sk_type;
+ security_sk_clone(parent, sk);
+ }
+}
+
+static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
+{
+ struct sock *sk;
+ struct iucv_sock *iucv;
+
+ sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
+ 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;
+}
+
+/* Create an IUCV socket */
+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, kern);
+ 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)
+{
+ unsigned long flags;
+ struct iucv_sock *par = iucv_sk(parent);
+
+ sock_hold(sk);
+ 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);
+ iucv_sk(sk)->parent = parent;
+ sk_acceptq_added(parent);
+}
+
+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);
+}
+
+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;
+}
+
+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);
+}
+
+/* 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;
+ int err = 0;
+ struct net_device *dev;
+ char uid[9];
+
+ /* Verify the input sockaddr */
+ if (addr_len < sizeof(struct sockaddr_iucv) ||
+ 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_user_id, sa->siucv_user_id, 8);
+ /* 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);
+ 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;
+}
+
+/* Automatically bind an unbound socket */
+static int iucv_sock_autobind(struct sock *sk)
+{
+ struct iucv_sock *iucv = iucv_sk(sk);
+ int err = 0;
+
+ if (unlikely(!pr_iucv))
+ return -EPROTO;
+
+ memcpy(iucv->src_user_id, iucv_userid, 8);
+
+ write_lock_bh(&iucv_sk_list.lock);
+ __iucv_auto_name(iucv);
+ write_unlock_bh(&iucv_sk_list.lock);
+
+ if (!iucv->msglimit)
+ iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
+
+ return err;
+}
+
+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;
+}
+
+/* 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;
+
+ if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_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;
+}
+
+/* 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;
+ 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;
+}
+
+/* Accept a pending connection */
+static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
+ int flags, bool kern)
+{
+ 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;
+}
+
+static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
+ int peer)
+{
+ struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
+ struct sock *sk = sock->sk;
+ struct iucv_sock *iucv = iucv_sk(sk);
+
+ addr->sa_family = AF_IUCV;
+
+ if (peer) {
+ memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
+ memcpy(siucv->siucv_name, iucv->dst_name, 8);
+ } else {
+ memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
+ memcpy(siucv->siucv_name, iucv->src_name, 8);
+ }
+ memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
+ memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
+ memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
+
+ return sizeof(struct sockaddr_iucv);
+}
+
+/**
+ * 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;
+ return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
+ (void *) prmdata, 8);
+}
+
+static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
+ size_t len)
+{
+ struct sock *sk = sock->sk;
+ struct iucv_sock *iucv = iucv_sk(sk);
+ size_t headroom = 0;
+ size_t linear;
+ struct sk_buff *skb;
+ struct iucv_message txmsg = {0};
+ 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_each_cmsghdr(cmsg, msg) {
+ 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;
+ }
+ }
+
+ /* 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) {
+ headroom = sizeof(struct af_iucv_trans_hdr) +
+ LL_RESERVED_SPACE(iucv->hs_dev);
+ linear = len;
+ } else {
+ 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;
+ }
+ }
+ skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
+ noblock, &err, 0);
+ if (!skb)
+ goto out;
+ 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)
+ 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++;
+ IUCV_SKB_CB(skb)->tag = txmsg.tag;
+
+ 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 out;
+ }
+ } 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);
+ }
+
+ /* 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);
+ }
+ 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_sock(sk);
+ return len;
+
+fail:
+ kfree_skb(skb);
+out:
+ release_sock(sk);
+ return err;
+}
+
+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;
+}
+
+/* iucv_process_message() - Receive a single outstanding IUCV message
+ *
+ * Locking: must be called with message_q.lock held
+ */
+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 */
+ IUCV_SKB_CB(skb)->class = msg->class;
+
+ /* 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 {
+ 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,
+ msg->flags & IUCV_IPRMDATA,
+ skb->data, len, NULL);
+ }
+ if (rc) {
+ kfree_skb(skb);
+ return;
+ }
+ WARN_ON_ONCE(skb->len != len);
+ }
+
+ IUCV_SKB_CB(skb)->offset = 0;
+ 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);
+}
+
+/* iucv_process_message_q() - Process outstanding IUCV messages
+ *
+ * Locking: must be called with message_q.lock held
+ */
+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_iucv_recv_skb(iucv_msg_length(&p->msg));
+ 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;
+ }
+}
+
+static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
+ size_t len, int flags)
+{
+ int noblock = flags & MSG_DONTWAIT;
+ struct sock *sk = sock->sk;
+ struct iucv_sock *iucv = iucv_sk(sk);
+ unsigned int copied, rlen;
+ struct sk_buff *skb, *rskb, *cskb;
+ int err = 0;
+ u32 offset;
+
+ if ((sk->sk_state == IUCV_DISCONN) &&
+ skb_queue_empty(&iucv->backlog_skb_q) &&
+ skb_queue_empty(&sk->sk_receive_queue) &&
+ list_empty(&iucv->message_q.list))
+ return 0;
+
+ if (flags & (MSG_OOB))
+ return -EOPNOTSUPP;
+
+ /* receive/dequeue next skb:
+ * the function understands MSG_PEEK and, thus, does not dequeue skb */
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb) {
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ return 0;
+ return err;
+ }
+
+ offset = IUCV_SKB_CB(skb)->offset;
+ rlen = skb->len - offset; /* real length of skb */
+ copied = min_t(unsigned int, rlen, len);
+ if (!rlen)
+ sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
+
+ cskb = skb;
+ if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
+ if (!(flags & MSG_PEEK))
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ return -EFAULT;
+ }
+
+ /* 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;
+ }
+
+ /* 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,
+ sizeof(IUCV_SKB_CB(skb)->class),
+ (void *)&IUCV_SKB_CB(skb)->class);
+ if (err) {
+ if (!(flags & MSG_PEEK))
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ return err;
+ }
+
+ /* Mark read part of skb as used */
+ if (!(flags & MSG_PEEK)) {
+
+ /* SOCK_STREAM: re-queue skb if it contains unreceived data */
+ if (sk->sk_type == SOCK_STREAM) {
+ if (copied < rlen) {
+ IUCV_SKB_CB(skb)->offset = offset + copied;
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ goto done;
+ }
+ }
+
+ kfree_skb(skb);
+ 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;
+ }
+ }
+
+ /* Queue backlog skbs */
+ spin_lock_bh(&iucv->message_q.lock);
+ rskb = skb_dequeue(&iucv->backlog_skb_q);
+ while (rskb) {
+ IUCV_SKB_CB(rskb)->offset = 0;
+ if (__sock_queue_rcv_skb(sk, rskb)) {
+ /* handle rcv queue full */
+ skb_queue_head(&iucv->backlog_skb_q,
+ rskb);
+ break;
+ }
+ rskb = skb_dequeue(&iucv->backlog_skb_q);
+ }
+ if (skb_queue_empty(&iucv->backlog_skb_q)) {
+ if (!list_empty(&iucv->message_q.list))
+ iucv_process_message_q(sk);
+ if (atomic_read(&iucv->msg_recv) >=
+ iucv->msglimit / 2) {
+ err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
+ if (err) {
+ sk->sk_state = IUCV_DISCONN;
+ sk->sk_state_change(sk);
+ }
+ }
+ }
+ spin_unlock_bh(&iucv->message_q.lock);
+ }
+
+done:
+ /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
+ if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
+ copied = rlen;
+
+ return copied;
+}
+
+static inline __poll_t 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 EPOLLIN | EPOLLRDNORM;
+ }
+
+ return 0;
+}
+
+__poll_t iucv_sock_poll(struct file *file, struct socket *sock,
+ poll_table *wait)
+{
+ struct sock *sk = sock->sk;
+ __poll_t mask = 0;
+
+ sock_poll_wait(file, sock, wait);
+
+ if (sk->sk_state == IUCV_LISTEN)
+ return iucv_accept_poll(sk);
+
+ if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
+ mask |= EPOLLERR |
+ (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ mask |= EPOLLRDHUP;
+
+ if (sk->sk_shutdown == SHUTDOWN_MASK)
+ mask |= EPOLLHUP;
+
+ if (!skb_queue_empty(&sk->sk_receive_queue) ||
+ (sk->sk_shutdown & RCV_SHUTDOWN))
+ mask |= EPOLLIN | EPOLLRDNORM;
+
+ if (sk->sk_state == IUCV_CLOSED)
+ mask |= EPOLLHUP;
+
+ if (sk->sk_state == IUCV_DISCONN)
+ mask |= EPOLLIN;
+
+ if (sock_writeable(sk) && iucv_below_msglim(sk))
+ mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
+ else
+ sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
+
+ 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);
+ 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) &&
+ sk->sk_state == IUCV_CONNECTED) {
+ 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) &&
+ iucv->path) {
+ 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;
+}
+
+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;
+}
+
+/* getsockopt and setsockopt */
+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;
+}
+
+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;
+}
+
+
+/* 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;
+ 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_protocol, GFP_ATOMIC, 0);
+ 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);
+ 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;
+ struct iucv_sock *iucv = iucv_sk(sk);
+ struct sk_buff *skb;
+ struct sock_msg_q *save_msg;
+ int len;
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN) {
+ pr_iucv->message_reject(path, msg);
+ return;
+ }
+
+ spin_lock(&iucv->message_q.lock);
+
+ if (!list_empty(&iucv->message_q.list) ||
+ !skb_queue_empty(&iucv->backlog_skb_q))
+ goto save_message;
+
+ len = atomic_read(&sk->sk_rmem_alloc);
+ len += SKB_TRUESIZE(iucv_msg_length(msg));
+ if (len > sk->sk_rcvbuf)
+ goto save_message;
+
+ skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
+ if (!skb)
+ goto save_message;
+
+ iucv_process_message(sk, skb, path, msg);
+ goto out_unlock;
+
+save_message:
+ save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
+ if (!save_msg)
+ goto out_unlock;
+ save_msg->path = path;
+ save_msg->msg = *msg;
+
+ list_add_tail(&save_msg->list, &iucv->message_q.list);
+
+out_unlock:
+ spin_unlock(&iucv->message_q.lock);
+}
+
+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 (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
+ 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);
+
+}
+
+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);
+}
+
+/* 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);
+}
+
+/***************** 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;
+ }
+
+ nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
+ 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);
+ iucv_sock_kill(nsk);
+ 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);
+ } 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 */
+ 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;
+}
+
+/**
+ * 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;
+ }
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN) {
+ kfree_skb(skb);
+ return NET_RX_SUCCESS;
+ }
+
+ /* write stuff from iucv_msg to skb cb */
+ skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
+ skb_reset_transport_header(skb);
+ skb_reset_network_header(skb);
+ IUCV_SKB_CB(skb)->offset = 0;
+ if (sk_filter(sk, skb)) {
+ atomic_inc(&sk->sk_drops); /* skb rejected by filter */
+ kfree_skb(skb);
+ return NET_RX_SUCCESS;
+ }
+
+ 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;
+}
+
+/**
+ * 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;
+ int err = NET_RX_SUCCESS;
+ char nullstring[8];
+
+ 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;
+ }
+ 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 */
+ IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
+ err = afiucv_hs_callback_rx(sk, skb);
+ break;
+ default:
+ kfree_skb(skb);
+ }
+
+ 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;
+ 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);
+ }
+ }
+
+}
+
+/*
+ * afiucv_netdev_event: handle netdev notifier chain events
+ */
+static int afiucv_netdev_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct net_device *event_dev = netdev_notifier_info_to_dev(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;
+}
+
+static struct notifier_block afiucv_netdev_notifier = {
+ .notifier_call = afiucv_netdev_event,
+};
+
+static const struct proto_ops iucv_sock_ops = {
+ .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,
+ .poll = iucv_sock_poll,
+ .ioctl = sock_no_ioctl,
+ .mmap = sock_no_mmap,
+ .socketpair = sock_no_socketpair,
+ .shutdown = iucv_sock_shutdown,
+ .setsockopt = iucv_sock_setsockopt,
+ .getsockopt = iucv_sock_getsockopt,
+};
+
+static const struct net_proto_family iucv_sock_family_ops = {
+ .family = AF_IUCV,
+ .owner = THIS_MODULE,
+ .create = iucv_sock_create,
+};
+
+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)
+{
+ 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_iucv_dev;
+ return 0;
+
+out_iucv_dev:
+ put_device(af_iucv_dev);
+out_driver:
+ driver_unregister(&af_iucv_driver);
+out_iucv:
+ pr_iucv->iucv_unregister(&af_iucv_handler, 0);
+out:
+ return err;
+}
+
+static void afiucv_iucv_exit(void)
+{
+ device_unregister(af_iucv_dev);
+ driver_unregister(&af_iucv_driver);
+ pr_iucv->iucv_unregister(&af_iucv_handler, 0);
+}
+
+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;
+ }
+
+ err = register_netdevice_notifier(&afiucv_netdev_notifier);
+ if (err)
+ goto out_notifier;
+
+ dev_add_pack(&iucv_packet_type);
+ return 0;
+
+out_notifier:
+ if (pr_iucv)
+ afiucv_iucv_exit();
+out_sock:
+ sock_unregister(PF_IUCV);
+out_proto:
+ proto_unregister(&iucv_proto);
+out:
+ if (pr_iucv)
+ symbol_put(iucv_if);
+ return err;
+}
+
+static void __exit afiucv_exit(void)
+{
+ if (pr_iucv) {
+ afiucv_iucv_exit();
+ symbol_put(iucv_if);
+ }
+
+ unregister_netdevice_notifier(&afiucv_netdev_notifier);
+ dev_remove_pack(&iucv_packet_type);
+ 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);
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
new file mode 100644
index 000000000..eb502c629
--- /dev/null
+++ b/net/iucv/iucv.c
@@ -0,0 +1,2107 @@
+/*
+ * IUCV base infrastructure.
+ *
+ * Copyright IBM Corp. 2001, 2009
+ *
+ * Author(s):
+ * Original source:
+ * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
+ * Xenia Tkatschow (xenia@us.ibm.com)
+ * 2Gb awareness and general cleanup:
+ * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
+ * Rewritten for af_iucv:
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * PM functions:
+ * Ursula Braun (ursula.braun@de.ibm.com)
+ *
+ * Documentation used:
+ * The original source
+ * CP Programming Service, IBM document # SC24-5760
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define KMSG_COMPONENT "iucv"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/cpu.h>
+#include <linux/reboot.h>
+#include <net/iucv/iucv.h>
+#include <linux/atomic.h>
+#include <asm/ebcdic.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/smp.h>
+
+/*
+ * FLAGS:
+ * All flags are defined in the field IPFLAGS1 of each function
+ * and can be found in CP Programming Services.
+ * IPSRCCLS - Indicates you have specified a source class.
+ * IPTRGCLS - Indicates you have specified a target class.
+ * IPFGPID - Indicates you have specified a pathid.
+ * IPFGMID - Indicates you have specified a message ID.
+ * IPNORPY - Indicates a one-way message. No reply expected.
+ * IPALL - Indicates that all paths are affected.
+ */
+#define IUCV_IPSRCCLS 0x01
+#define IUCV_IPTRGCLS 0x01
+#define IUCV_IPFGPID 0x02
+#define IUCV_IPFGMID 0x04
+#define IUCV_IPNORPY 0x10
+#define IUCV_IPALL 0x80
+
+static int iucv_bus_match(struct device *dev, struct device_driver *drv)
+{
+ return 0;
+}
+
+enum iucv_pm_states {
+ IUCV_PM_INITIAL = 0,
+ IUCV_PM_FREEZING = 1,
+ IUCV_PM_THAWING = 2,
+ IUCV_PM_RESTORING = 3,
+};
+static enum iucv_pm_states iucv_pm_state;
+
+static int iucv_pm_prepare(struct device *);
+static void iucv_pm_complete(struct device *);
+static int iucv_pm_freeze(struct device *);
+static int iucv_pm_thaw(struct device *);
+static int iucv_pm_restore(struct device *);
+
+static const struct dev_pm_ops iucv_pm_ops = {
+ .prepare = iucv_pm_prepare,
+ .complete = iucv_pm_complete,
+ .freeze = iucv_pm_freeze,
+ .thaw = iucv_pm_thaw,
+ .restore = iucv_pm_restore,
+};
+
+struct bus_type iucv_bus = {
+ .name = "iucv",
+ .match = iucv_bus_match,
+ .pm = &iucv_pm_ops,
+};
+EXPORT_SYMBOL(iucv_bus);
+
+struct device *iucv_root;
+EXPORT_SYMBOL(iucv_root);
+
+static int iucv_available;
+
+/* General IUCV interrupt structure */
+struct iucv_irq_data {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 res2[8];
+};
+
+struct iucv_irq_list {
+ struct list_head list;
+ struct iucv_irq_data data;
+};
+
+static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
+static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
+static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
+
+/*
+ * Queue of interrupt buffers lock for delivery via the tasklet
+ * (fast but can't call smp_call_function).
+ */
+static LIST_HEAD(iucv_task_queue);
+
+/*
+ * The tasklet for fast delivery of iucv interrupts.
+ */
+static void iucv_tasklet_fn(unsigned long);
+static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
+
+/*
+ * Queue of interrupt buffers for delivery via a work queue
+ * (slower but can call smp_call_function).
+ */
+static LIST_HEAD(iucv_work_queue);
+
+/*
+ * The work element to deliver path pending interrupts.
+ */
+static void iucv_work_fn(struct work_struct *work);
+static DECLARE_WORK(iucv_work, iucv_work_fn);
+
+/*
+ * Spinlock protecting task and work queue.
+ */
+static DEFINE_SPINLOCK(iucv_queue_lock);
+
+enum iucv_command_codes {
+ IUCV_QUERY = 0,
+ IUCV_RETRIEVE_BUFFER = 2,
+ IUCV_SEND = 4,
+ IUCV_RECEIVE = 5,
+ IUCV_REPLY = 6,
+ IUCV_REJECT = 8,
+ IUCV_PURGE = 9,
+ IUCV_ACCEPT = 10,
+ IUCV_CONNECT = 11,
+ IUCV_DECLARE_BUFFER = 12,
+ IUCV_QUIESCE = 13,
+ IUCV_RESUME = 14,
+ IUCV_SEVER = 15,
+ IUCV_SETMASK = 16,
+ IUCV_SETCONTROLMASK = 17,
+};
+
+/*
+ * Error messages that are used with the iucv_sever function. They get
+ * converted to EBCDIC.
+ */
+static char iucv_error_no_listener[16] = "NO LISTENER";
+static char iucv_error_no_memory[16] = "NO MEMORY";
+static char iucv_error_pathid[16] = "INVALID PATHID";
+
+/*
+ * iucv_handler_list: List of registered handlers.
+ */
+static LIST_HEAD(iucv_handler_list);
+
+/*
+ * iucv_path_table: an array of iucv_path structures.
+ */
+static struct iucv_path **iucv_path_table;
+static unsigned long iucv_max_pathid;
+
+/*
+ * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
+ */
+static DEFINE_SPINLOCK(iucv_table_lock);
+
+/*
+ * iucv_active_cpu: contains the number of the cpu executing the tasklet
+ * or the work handler. Needed for iucv_path_sever called from tasklet.
+ */
+static int iucv_active_cpu = -1;
+
+/*
+ * Mutex and wait queue for iucv_register/iucv_unregister.
+ */
+static DEFINE_MUTEX(iucv_register_mutex);
+
+/*
+ * Counter for number of non-smp capable handlers.
+ */
+static int iucv_nonsmp_handler;
+
+/*
+ * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
+ * iucv_path_quiesce and iucv_path_sever.
+ */
+struct iucv_cmd_control {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u16 ipmsglim;
+ u16 res1;
+ u8 ipvmid[8];
+ u8 ipuser[16];
+ u8 iptarget[8];
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Data in parameter list iucv structure. Used by iucv_message_send,
+ * iucv_message_send2way and iucv_message_reply.
+ */
+struct iucv_cmd_dpl {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ u8 iprmmsg[8];
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 ipbfadr2;
+ u32 ipbfln2f;
+ u32 res;
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Data in buffer iucv structure. Used by iucv_message_receive,
+ * iucv_message_reject, iucv_message_send, iucv_message_send2way
+ * and iucv_declare_cpu.
+ */
+struct iucv_cmd_db {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ u32 ipbfadr1;
+ u32 ipbfln1f;
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 ipbfadr2;
+ u32 ipbfln2f;
+ u32 res;
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Purge message iucv structure. Used by iucv_message_purge.
+ */
+struct iucv_cmd_purge {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u8 ipaudit[3];
+ u8 res1[5];
+ u32 res2;
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 res3[3];
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Set mask iucv structure. Used by iucv_enable_cpu.
+ */
+struct iucv_cmd_set_mask {
+ u8 ipmask;
+ u8 res1[2];
+ u8 iprcode;
+ u32 res2[9];
+} __attribute__ ((packed,aligned(8)));
+
+union iucv_param {
+ struct iucv_cmd_control ctrl;
+ struct iucv_cmd_dpl dpl;
+ struct iucv_cmd_db db;
+ struct iucv_cmd_purge purge;
+ struct iucv_cmd_set_mask set_mask;
+};
+
+/*
+ * Anchor for per-cpu IUCV command parameter block.
+ */
+static union iucv_param *iucv_param[NR_CPUS];
+static union iucv_param *iucv_param_irq[NR_CPUS];
+
+/**
+ * iucv_call_b2f0
+ * @code: identifier of IUCV call to CP.
+ * @parm: pointer to a struct iucv_parm block
+ *
+ * Calls CP to execute IUCV commands.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+static inline int __iucv_call_b2f0(int command, union iucv_param *parm)
+{
+ register unsigned long reg0 asm ("0");
+ register unsigned long reg1 asm ("1");
+ int ccode;
+
+ reg0 = command;
+ reg1 = (unsigned long)parm;
+ asm volatile(
+ " .long 0xb2f01000\n"
+ " ipm %0\n"
+ " srl %0,28\n"
+ : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
+ : "m" (*parm) : "cc");
+ return ccode;
+}
+
+static inline int iucv_call_b2f0(int command, union iucv_param *parm)
+{
+ int ccode;
+
+ ccode = __iucv_call_b2f0(command, parm);
+ return ccode == 1 ? parm->ctrl.iprcode : ccode;
+}
+
+/**
+ * iucv_query_maxconn
+ *
+ * Determines the maximum number of connections that may be established.
+ *
+ * Returns the maximum number of connections or -EPERM is IUCV is not
+ * available.
+ */
+static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
+{
+ register unsigned long reg0 asm ("0");
+ register unsigned long reg1 asm ("1");
+ int ccode;
+
+ reg0 = IUCV_QUERY;
+ reg1 = (unsigned long) param;
+ asm volatile (
+ " .long 0xb2f01000\n"
+ " ipm %0\n"
+ " srl %0,28\n"
+ : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
+ *max_pathid = reg1;
+ return ccode;
+}
+
+static int iucv_query_maxconn(void)
+{
+ unsigned long max_pathid;
+ void *param;
+ int ccode;
+
+ param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
+ if (!param)
+ return -ENOMEM;
+ ccode = __iucv_query_maxconn(param, &max_pathid);
+ if (ccode == 0)
+ iucv_max_pathid = max_pathid;
+ kfree(param);
+ return ccode ? -EPERM : 0;
+}
+
+/**
+ * iucv_allow_cpu
+ * @data: unused
+ *
+ * Allow iucv interrupts on this cpu.
+ */
+static void iucv_allow_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ /*
+ * Enable all iucv interrupts.
+ * ipmask contains bits for the different interrupts
+ * 0x80 - Flag to allow nonpriority message pending interrupts
+ * 0x40 - Flag to allow priority message pending interrupts
+ * 0x20 - Flag to allow nonpriority message completion interrupts
+ * 0x10 - Flag to allow priority message completion interrupts
+ * 0x08 - Flag to allow IUCV control interrupts
+ */
+ parm = iucv_param_irq[cpu];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0xf8;
+ iucv_call_b2f0(IUCV_SETMASK, parm);
+
+ /*
+ * Enable all iucv control interrupts.
+ * ipmask contains bits for the different interrupts
+ * 0x80 - Flag to allow pending connections interrupts
+ * 0x40 - Flag to allow connection complete interrupts
+ * 0x20 - Flag to allow connection severed interrupts
+ * 0x10 - Flag to allow connection quiesced interrupts
+ * 0x08 - Flag to allow connection resumed interrupts
+ */
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0xf8;
+ iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
+ /* Set indication that iucv interrupts are allowed for this cpu. */
+ cpumask_set_cpu(cpu, &iucv_irq_cpumask);
+}
+
+/**
+ * iucv_block_cpu
+ * @data: unused
+ *
+ * Block iucv interrupts on this cpu.
+ */
+static void iucv_block_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ /* Disable all iucv interrupts. */
+ parm = iucv_param_irq[cpu];
+ memset(parm, 0, sizeof(union iucv_param));
+ iucv_call_b2f0(IUCV_SETMASK, parm);
+
+ /* Clear indication that iucv interrupts are allowed for this cpu. */
+ cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
+}
+
+/**
+ * iucv_block_cpu_almost
+ * @data: unused
+ *
+ * Allow connection-severed interrupts only on this cpu.
+ */
+static void iucv_block_cpu_almost(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ /* Allow iucv control interrupts only */
+ parm = iucv_param_irq[cpu];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0x08;
+ iucv_call_b2f0(IUCV_SETMASK, parm);
+ /* Allow iucv-severed interrupt only */
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0x20;
+ iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
+
+ /* Clear indication that iucv interrupts are allowed for this cpu. */
+ cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
+}
+
+/**
+ * iucv_declare_cpu
+ * @data: unused
+ *
+ * Declare a interrupt buffer on this cpu.
+ */
+static void iucv_declare_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+ int rc;
+
+ if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
+ return;
+
+ /* Declare interrupt buffer. */
+ parm = iucv_param_irq[cpu];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
+ rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
+ if (rc) {
+ char *err = "Unknown";
+ switch (rc) {
+ case 0x03:
+ err = "Directory error";
+ break;
+ case 0x0a:
+ err = "Invalid length";
+ break;
+ case 0x13:
+ err = "Buffer already exists";
+ break;
+ case 0x3e:
+ err = "Buffer overlap";
+ break;
+ case 0x5c:
+ err = "Paging or storage error";
+ break;
+ }
+ pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
+ cpu, rc, err);
+ return;
+ }
+
+ /* Set indication that an iucv buffer exists for this cpu. */
+ cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
+
+ if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
+ /* Enable iucv interrupts on this cpu. */
+ iucv_allow_cpu(NULL);
+ else
+ /* Disable iucv interrupts on this cpu. */
+ iucv_block_cpu(NULL);
+}
+
+/**
+ * iucv_retrieve_cpu
+ * @data: unused
+ *
+ * Retrieve interrupt buffer on this cpu.
+ */
+static void iucv_retrieve_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
+ return;
+
+ /* Block iucv interrupts. */
+ iucv_block_cpu(NULL);
+
+ /* Retrieve interrupt buffer. */
+ parm = iucv_param_irq[cpu];
+ iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
+
+ /* Clear indication that an iucv buffer exists for this cpu. */
+ cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
+}
+
+/**
+ * iucv_setmask_smp
+ *
+ * Allow iucv interrupts on all cpus.
+ */
+static void iucv_setmask_mp(void)
+{
+ int cpu;
+
+ get_online_cpus();
+ for_each_online_cpu(cpu)
+ /* Enable all cpus with a declared buffer. */
+ if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
+ !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
+ smp_call_function_single(cpu, iucv_allow_cpu,
+ NULL, 1);
+ put_online_cpus();
+}
+
+/**
+ * iucv_setmask_up
+ *
+ * Allow iucv interrupts on a single cpu.
+ */
+static void iucv_setmask_up(void)
+{
+ cpumask_t cpumask;
+ int cpu;
+
+ /* Disable all cpu but the first in cpu_irq_cpumask. */
+ cpumask_copy(&cpumask, &iucv_irq_cpumask);
+ cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
+ for_each_cpu(cpu, &cpumask)
+ smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
+}
+
+/**
+ * iucv_enable
+ *
+ * This function makes iucv ready for use. It allocates the pathid
+ * table, declares an iucv interrupt buffer and enables the iucv
+ * interrupts. Called when the first user has registered an iucv
+ * handler.
+ */
+static int iucv_enable(void)
+{
+ size_t alloc_size;
+ int cpu, rc;
+
+ get_online_cpus();
+ rc = -ENOMEM;
+ alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
+ iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
+ if (!iucv_path_table)
+ goto out;
+ /* Declare per cpu buffers. */
+ rc = -EIO;
+ for_each_online_cpu(cpu)
+ smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
+ if (cpumask_empty(&iucv_buffer_cpumask))
+ /* No cpu could declare an iucv buffer. */
+ goto out;
+ put_online_cpus();
+ return 0;
+out:
+ kfree(iucv_path_table);
+ iucv_path_table = NULL;
+ put_online_cpus();
+ return rc;
+}
+
+/**
+ * iucv_disable
+ *
+ * This function shuts down iucv. It disables iucv interrupts, retrieves
+ * the iucv interrupt buffer and frees the pathid table. Called after the
+ * last user unregister its iucv handler.
+ */
+static void iucv_disable(void)
+{
+ get_online_cpus();
+ on_each_cpu(iucv_retrieve_cpu, NULL, 1);
+ kfree(iucv_path_table);
+ iucv_path_table = NULL;
+ put_online_cpus();
+}
+
+static int iucv_cpu_dead(unsigned int cpu)
+{
+ kfree(iucv_param_irq[cpu]);
+ iucv_param_irq[cpu] = NULL;
+ kfree(iucv_param[cpu]);
+ iucv_param[cpu] = NULL;
+ kfree(iucv_irq_data[cpu]);
+ iucv_irq_data[cpu] = NULL;
+ return 0;
+}
+
+static int iucv_cpu_prepare(unsigned int cpu)
+{
+ /* Note: GFP_DMA used to get memory below 2G */
+ iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
+ GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+ if (!iucv_irq_data[cpu])
+ goto out_free;
+
+ /* Allocate parameter blocks. */
+ iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
+ GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+ if (!iucv_param[cpu])
+ goto out_free;
+
+ iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
+ GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+ if (!iucv_param_irq[cpu])
+ goto out_free;
+
+ return 0;
+
+out_free:
+ iucv_cpu_dead(cpu);
+ return -ENOMEM;
+}
+
+static int iucv_cpu_online(unsigned int cpu)
+{
+ if (!iucv_path_table)
+ return 0;
+ iucv_declare_cpu(NULL);
+ return 0;
+}
+
+static int iucv_cpu_down_prep(unsigned int cpu)
+{
+ cpumask_t cpumask;
+
+ if (!iucv_path_table)
+ return 0;
+
+ cpumask_copy(&cpumask, &iucv_buffer_cpumask);
+ cpumask_clear_cpu(cpu, &cpumask);
+ if (cpumask_empty(&cpumask))
+ /* Can't offline last IUCV enabled cpu. */
+ return -EINVAL;
+
+ iucv_retrieve_cpu(NULL);
+ if (!cpumask_empty(&iucv_irq_cpumask))
+ return 0;
+ smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
+ iucv_allow_cpu, NULL, 1);
+ return 0;
+}
+
+/**
+ * iucv_sever_pathid
+ * @pathid: path identification number.
+ * @userdata: 16-bytes of user data.
+ *
+ * Sever an iucv path to free up the pathid. Used internally.
+ */
+static int iucv_sever_pathid(u16 pathid, u8 *userdata)
+{
+ union iucv_param *parm;
+
+ parm = iucv_param_irq[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = pathid;
+ return iucv_call_b2f0(IUCV_SEVER, parm);
+}
+
+/**
+ * __iucv_cleanup_queue
+ * @dummy: unused dummy argument
+ *
+ * Nop function called via smp_call_function to force work items from
+ * pending external iucv interrupts to the work queue.
+ */
+static void __iucv_cleanup_queue(void *dummy)
+{
+}
+
+/**
+ * iucv_cleanup_queue
+ *
+ * Function called after a path has been severed to find all remaining
+ * work items for the now stale pathid. The caller needs to hold the
+ * iucv_table_lock.
+ */
+static void iucv_cleanup_queue(void)
+{
+ struct iucv_irq_list *p, *n;
+
+ /*
+ * When a path is severed, the pathid can be reused immediately
+ * on a iucv connect or a connection pending interrupt. Remove
+ * all entries from the task queue that refer to a stale pathid
+ * (iucv_path_table[ix] == NULL). Only then do the iucv connect
+ * or deliver the connection pending interrupt. To get all the
+ * pending interrupts force them to the work queue by calling
+ * an empty function on all cpus.
+ */
+ smp_call_function(__iucv_cleanup_queue, NULL, 1);
+ spin_lock_irq(&iucv_queue_lock);
+ list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
+ /* Remove stale work items from the task queue. */
+ if (iucv_path_table[p->data.ippathid] == NULL) {
+ list_del(&p->list);
+ kfree(p);
+ }
+ }
+ spin_unlock_irq(&iucv_queue_lock);
+}
+
+/**
+ * iucv_register:
+ * @handler: address of iucv handler structure
+ * @smp: != 0 indicates that the handler can deal with out of order messages
+ *
+ * Registers a driver with IUCV.
+ *
+ * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
+ * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
+ */
+int iucv_register(struct iucv_handler *handler, int smp)
+{
+ int rc;
+
+ if (!iucv_available)
+ return -ENOSYS;
+ mutex_lock(&iucv_register_mutex);
+ if (!smp)
+ iucv_nonsmp_handler++;
+ if (list_empty(&iucv_handler_list)) {
+ rc = iucv_enable();
+ if (rc)
+ goto out_mutex;
+ } else if (!smp && iucv_nonsmp_handler == 1)
+ iucv_setmask_up();
+ INIT_LIST_HEAD(&handler->paths);
+
+ spin_lock_bh(&iucv_table_lock);
+ list_add_tail(&handler->list, &iucv_handler_list);
+ spin_unlock_bh(&iucv_table_lock);
+ rc = 0;
+out_mutex:
+ mutex_unlock(&iucv_register_mutex);
+ return rc;
+}
+EXPORT_SYMBOL(iucv_register);
+
+/**
+ * iucv_unregister
+ * @handler: address of iucv handler structure
+ * @smp: != 0 indicates that the handler can deal with out of order messages
+ *
+ * Unregister driver from IUCV.
+ */
+void iucv_unregister(struct iucv_handler *handler, int smp)
+{
+ struct iucv_path *p, *n;
+
+ mutex_lock(&iucv_register_mutex);
+ spin_lock_bh(&iucv_table_lock);
+ /* Remove handler from the iucv_handler_list. */
+ list_del_init(&handler->list);
+ /* Sever all pathids still referring to the handler. */
+ list_for_each_entry_safe(p, n, &handler->paths, list) {
+ iucv_sever_pathid(p->pathid, NULL);
+ iucv_path_table[p->pathid] = NULL;
+ list_del(&p->list);
+ iucv_path_free(p);
+ }
+ spin_unlock_bh(&iucv_table_lock);
+ if (!smp)
+ iucv_nonsmp_handler--;
+ if (list_empty(&iucv_handler_list))
+ iucv_disable();
+ else if (!smp && iucv_nonsmp_handler == 0)
+ iucv_setmask_mp();
+ mutex_unlock(&iucv_register_mutex);
+}
+EXPORT_SYMBOL(iucv_unregister);
+
+static int iucv_reboot_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ int i;
+
+ if (cpumask_empty(&iucv_irq_cpumask))
+ return NOTIFY_DONE;
+
+ get_online_cpus();
+ on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
+ preempt_disable();
+ for (i = 0; i < iucv_max_pathid; i++) {
+ if (iucv_path_table[i])
+ iucv_sever_pathid(i, NULL);
+ }
+ preempt_enable();
+ put_online_cpus();
+ iucv_disable();
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block iucv_reboot_notifier = {
+ .notifier_call = iucv_reboot_event,
+};
+
+/**
+ * iucv_path_accept
+ * @path: address of iucv path structure
+ * @handler: address of iucv handler structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ * @private: private data passed to interrupt handlers for this path
+ *
+ * This function is issued after the user received a connection pending
+ * external interrupt and now wishes to complete the IUCV communication path.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
+ u8 *userdata, void *private)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ /* Prepare parameter block. */
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->ctrl.ippathid = path->pathid;
+ parm->ctrl.ipmsglim = path->msglim;
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ipflags1 = path->flags;
+
+ rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
+ if (!rc) {
+ path->private = private;
+ path->msglim = parm->ctrl.ipmsglim;
+ path->flags = parm->ctrl.ipflags1;
+ }
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_path_accept);
+
+/**
+ * iucv_path_connect
+ * @path: address of iucv path structure
+ * @handler: address of iucv handler structure
+ * @userid: 8-byte user identification
+ * @system: 8-byte target system identification
+ * @userdata: 16 bytes of data reflected to the communication partner
+ * @private: private data passed to interrupt handlers for this path
+ *
+ * This function establishes an IUCV path. Although the connect may complete
+ * successfully, you are not able to use the path until you receive an IUCV
+ * Connection Complete external interrupt.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
+ u8 *userid, u8 *system, u8 *userdata,
+ void *private)
+{
+ union iucv_param *parm;
+ int rc;
+
+ spin_lock_bh(&iucv_table_lock);
+ iucv_cleanup_queue();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->ctrl.ipmsglim = path->msglim;
+ parm->ctrl.ipflags1 = path->flags;
+ if (userid) {
+ memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
+ ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
+ EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
+ }
+ if (system) {
+ memcpy(parm->ctrl.iptarget, system,
+ sizeof(parm->ctrl.iptarget));
+ ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
+ EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
+ }
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+
+ rc = iucv_call_b2f0(IUCV_CONNECT, parm);
+ if (!rc) {
+ if (parm->ctrl.ippathid < iucv_max_pathid) {
+ path->pathid = parm->ctrl.ippathid;
+ path->msglim = parm->ctrl.ipmsglim;
+ path->flags = parm->ctrl.ipflags1;
+ path->handler = handler;
+ path->private = private;
+ list_add_tail(&path->list, &handler->paths);
+ iucv_path_table[path->pathid] = path;
+ } else {
+ iucv_sever_pathid(parm->ctrl.ippathid,
+ iucv_error_pathid);
+ rc = -EIO;
+ }
+ }
+out:
+ spin_unlock_bh(&iucv_table_lock);
+ return rc;
+}
+EXPORT_SYMBOL(iucv_path_connect);
+
+/**
+ * iucv_path_quiesce:
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function temporarily suspends incoming messages on an IUCV path.
+ * You can later reactivate the path by invoking the iucv_resume function.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_quiesce(struct iucv_path *path, u8 *userdata)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = path->pathid;
+ rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_path_quiesce);
+
+/**
+ * iucv_path_resume:
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function resumes incoming messages on an IUCV path that has
+ * been stopped with iucv_path_quiesce.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_resume(struct iucv_path *path, u8 *userdata)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = path->pathid;
+ rc = iucv_call_b2f0(IUCV_RESUME, parm);
+out:
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_path_sever
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function terminates an IUCV path.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_sever(struct iucv_path *path, u8 *userdata)
+{
+ int rc;
+
+ preempt_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ if (iucv_active_cpu != smp_processor_id())
+ spin_lock_bh(&iucv_table_lock);
+ rc = iucv_sever_pathid(path->pathid, userdata);
+ iucv_path_table[path->pathid] = NULL;
+ list_del_init(&path->list);
+ if (iucv_active_cpu != smp_processor_id())
+ spin_unlock_bh(&iucv_table_lock);
+out:
+ preempt_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_path_sever);
+
+/**
+ * iucv_message_purge
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @srccls: source class of message
+ *
+ * Cancels a message you have sent.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
+ u32 srccls)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->purge.ippathid = path->pathid;
+ parm->purge.ipmsgid = msg->id;
+ parm->purge.ipsrccls = srccls;
+ parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
+ rc = iucv_call_b2f0(IUCV_PURGE, parm);
+ if (!rc) {
+ msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
+ msg->tag = parm->purge.ipmsgtag;
+ }
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_purge);
+
+/**
+ * iucv_message_receive_iprmdata
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is received (IUCV_IPBUFLST)
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of data buffer
+ * @residual:
+ *
+ * Internal function used by iucv_message_receive and __iucv_message_receive
+ * to receive RMDATA data stored in struct iucv_message.
+ */
+static int iucv_message_receive_iprmdata(struct iucv_path *path,
+ struct iucv_message *msg,
+ u8 flags, void *buffer,
+ size_t size, size_t *residual)
+{
+ struct iucv_array *array;
+ u8 *rmmsg;
+ size_t copy;
+
+ /*
+ * Message is 8 bytes long and has been stored to the
+ * message descriptor itself.
+ */
+ if (residual)
+ *residual = abs(size - 8);
+ rmmsg = msg->rmmsg;
+ if (flags & IUCV_IPBUFLST) {
+ /* Copy to struct iucv_array. */
+ size = (size < 8) ? size : 8;
+ for (array = buffer; size > 0; array++) {
+ copy = min_t(size_t, size, array->length);
+ memcpy((u8 *)(addr_t) array->address,
+ rmmsg, copy);
+ rmmsg += copy;
+ size -= copy;
+ }
+ } else {
+ /* Copy to direct buffer. */
+ memcpy(buffer, rmmsg, min_t(size_t, size, 8));
+ }
+ return 0;
+}
+
+/**
+ * __iucv_message_receive
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is received (IUCV_IPBUFLST)
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of data buffer
+ * @residual:
+ *
+ * This function receives messages that are being sent to you over
+ * established paths. This function will deal with RMDATA messages
+ * embedded in struct iucv_message as well.
+ *
+ * Locking: no locking
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, void *buffer, size_t size, size_t *residual)
+{
+ union iucv_param *parm;
+ int rc;
+
+ if (msg->flags & IUCV_IPRMDATA)
+ return iucv_message_receive_iprmdata(path, msg, flags,
+ buffer, size, residual);
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ipmsgid = msg->id;
+ parm->db.ippathid = path->pathid;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipflags1 = (flags | IUCV_IPFGPID |
+ IUCV_IPFGMID | IUCV_IPTRGCLS);
+ rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
+ if (!rc || rc == 5) {
+ msg->flags = parm->db.ipflags1;
+ if (residual)
+ *residual = parm->db.ipbfln1f;
+ }
+out:
+ return rc;
+}
+EXPORT_SYMBOL(__iucv_message_receive);
+
+/**
+ * iucv_message_receive
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is received (IUCV_IPBUFLST)
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of data buffer
+ * @residual:
+ *
+ * This function receives messages that are being sent to you over
+ * established paths. This function will deal with RMDATA messages
+ * embedded in struct iucv_message as well.
+ *
+ * Locking: local_bh_enable/local_bh_disable
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, void *buffer, size_t size, size_t *residual)
+{
+ int rc;
+
+ if (msg->flags & IUCV_IPRMDATA)
+ return iucv_message_receive_iprmdata(path, msg, flags,
+ buffer, size, residual);
+ local_bh_disable();
+ rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_receive);
+
+/**
+ * iucv_message_reject
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ *
+ * The reject function refuses a specified message. Between the time you
+ * are notified of a message and the time that you complete the message,
+ * the message may be rejected.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ippathid = path->pathid;
+ parm->db.ipmsgid = msg->id;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
+ rc = iucv_call_b2f0(IUCV_REJECT, parm);
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_reject);
+
+/**
+ * iucv_message_reply
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @reply: address of reply data buffer or address of struct iucv_array
+ * @size: length of reply data buffer
+ *
+ * This function responds to the two-way messages that you receive. You
+ * must identify completely the message to which you wish to reply. ie,
+ * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
+ * the parameter list.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, void *reply, size_t size)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = flags;
+ parm->dpl.ipmsgid = msg->id;
+ parm->dpl.iptrgcls = msg->class;
+ memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
+ } else {
+ parm->db.ipbfadr1 = (u32)(addr_t) reply;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = flags;
+ parm->db.ipmsgid = msg->id;
+ parm->db.iptrgcls = msg->class;
+ }
+ rc = iucv_call_b2f0(IUCV_REPLY, parm);
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_reply);
+
+/**
+ * __iucv_message_send
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @srccls: source class of message
+ * @buffer: address of send buffer or address of struct iucv_array
+ * @size: length of send buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer and this is a one-way message and the
+ * receiver will not reply to the message.
+ *
+ * Locking: no locking
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, u32 srccls, void *buffer, size_t size)
+{
+ union iucv_param *parm;
+ int rc;
+
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ /* Message of 8 bytes can be placed into the parameter list. */
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
+ parm->dpl.iptrgcls = msg->class;
+ parm->dpl.ipsrccls = srccls;
+ parm->dpl.ipmsgtag = msg->tag;
+ memcpy(parm->dpl.iprmmsg, buffer, 8);
+ } else {
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = flags | IUCV_IPNORPY;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipsrccls = srccls;
+ parm->db.ipmsgtag = msg->tag;
+ }
+ rc = iucv_call_b2f0(IUCV_SEND, parm);
+ if (!rc)
+ msg->id = parm->db.ipmsgid;
+out:
+ return rc;
+}
+EXPORT_SYMBOL(__iucv_message_send);
+
+/**
+ * iucv_message_send
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @srccls: source class of message
+ * @buffer: address of send buffer or address of struct iucv_array
+ * @size: length of send buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer and this is a one-way message and the
+ * receiver will not reply to the message.
+ *
+ * Locking: local_bh_enable/local_bh_disable
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, u32 srccls, void *buffer, size_t size)
+{
+ int rc;
+
+ local_bh_disable();
+ rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_send);
+
+/**
+ * iucv_message_send2way
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent and the reply is received
+ * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
+ * @srccls: source class of message
+ * @buffer: address of send buffer or address of struct iucv_array
+ * @size: length of send buffer
+ * @ansbuf: address of answer buffer or address of struct iucv_array
+ * @asize: size of reply buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer. The receiver of the send is expected to
+ * reply to the message and a buffer is provided into which IUCV moves
+ * the reply to this message.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, u32 srccls, void *buffer, size_t size,
+ void *answer, size_t asize, size_t *residual)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ if (cpumask_empty(&iucv_buffer_cpumask)) {
+ rc = -EIO;
+ goto out;
+ }
+ parm = iucv_param[smp_processor_id()];
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = path->flags; /* priority message */
+ parm->dpl.iptrgcls = msg->class;
+ parm->dpl.ipsrccls = srccls;
+ parm->dpl.ipmsgtag = msg->tag;
+ parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
+ parm->dpl.ipbfln2f = (u32) asize;
+ memcpy(parm->dpl.iprmmsg, buffer, 8);
+ } else {
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = path->flags; /* priority message */
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipsrccls = srccls;
+ parm->db.ipmsgtag = msg->tag;
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ipbfadr2 = (u32)(addr_t) answer;
+ parm->db.ipbfln2f = (u32) asize;
+ }
+ rc = iucv_call_b2f0(IUCV_SEND, parm);
+ if (!rc)
+ msg->id = parm->db.ipmsgid;
+out:
+ local_bh_enable();
+ return rc;
+}
+EXPORT_SYMBOL(iucv_message_send2way);
+
+/**
+ * iucv_path_pending
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection pending work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_pending {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u16 ipmsglim;
+ u16 res1;
+ u8 ipvmid[8];
+ u8 ipuser[16];
+ u32 res3;
+ u8 ippollfg;
+ u8 res4[3];
+} __packed;
+
+static void iucv_path_pending(struct iucv_irq_data *data)
+{
+ struct iucv_path_pending *ipp = (void *) data;
+ struct iucv_handler *handler;
+ struct iucv_path *path;
+ char *error;
+
+ BUG_ON(iucv_path_table[ipp->ippathid]);
+ /* New pathid, handler found. Create a new path struct. */
+ error = iucv_error_no_memory;
+ path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
+ if (!path)
+ goto out_sever;
+ path->pathid = ipp->ippathid;
+ iucv_path_table[path->pathid] = path;
+ EBCASC(ipp->ipvmid, 8);
+
+ /* Call registered handler until one is found that wants the path. */
+ list_for_each_entry(handler, &iucv_handler_list, list) {
+ if (!handler->path_pending)
+ continue;
+ /*
+ * Add path to handler to allow a call to iucv_path_sever
+ * inside the path_pending function. If the handler returns
+ * an error remove the path from the handler again.
+ */
+ list_add(&path->list, &handler->paths);
+ path->handler = handler;
+ if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
+ return;
+ list_del(&path->list);
+ path->handler = NULL;
+ }
+ /* No handler wanted the path. */
+ iucv_path_table[path->pathid] = NULL;
+ iucv_path_free(path);
+ error = iucv_error_no_listener;
+out_sever:
+ iucv_sever_pathid(ipp->ippathid, error);
+}
+
+/**
+ * iucv_path_complete
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection complete work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_complete {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u16 ipmsglim;
+ u16 res1;
+ u8 res2[8];
+ u8 ipuser[16];
+ u32 res3;
+ u8 ippollfg;
+ u8 res4[3];
+} __packed;
+
+static void iucv_path_complete(struct iucv_irq_data *data)
+{
+ struct iucv_path_complete *ipc = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipc->ippathid];
+
+ if (path)
+ path->flags = ipc->ipflags1;
+ if (path && path->handler && path->handler->path_complete)
+ path->handler->path_complete(path, ipc->ipuser);
+}
+
+/**
+ * iucv_path_severed
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection severed work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_severed {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __packed;
+
+static void iucv_path_severed(struct iucv_irq_data *data)
+{
+ struct iucv_path_severed *ips = (void *) data;
+ struct iucv_path *path = iucv_path_table[ips->ippathid];
+
+ if (!path || !path->handler) /* Already severed */
+ return;
+ if (path->handler->path_severed)
+ path->handler->path_severed(path, ips->ipuser);
+ else {
+ iucv_sever_pathid(path->pathid, NULL);
+ iucv_path_table[path->pathid] = NULL;
+ list_del(&path->list);
+ iucv_path_free(path);
+ }
+}
+
+/**
+ * iucv_path_quiesced
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection quiesced work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_quiesced {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __packed;
+
+static void iucv_path_quiesced(struct iucv_irq_data *data)
+{
+ struct iucv_path_quiesced *ipq = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipq->ippathid];
+
+ if (path && path->handler && path->handler->path_quiesced)
+ path->handler->path_quiesced(path, ipq->ipuser);
+}
+
+/**
+ * iucv_path_resumed
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection resumed work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_resumed {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __packed;
+
+static void iucv_path_resumed(struct iucv_irq_data *data)
+{
+ struct iucv_path_resumed *ipr = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipr->ippathid];
+
+ if (path && path->handler && path->handler->path_resumed)
+ path->handler->path_resumed(path, ipr->ipuser);
+}
+
+/**
+ * iucv_message_complete
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process message complete work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_message_complete {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 ipmsgid;
+ u32 ipaudit;
+ u8 iprmmsg[8];
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 res;
+ u32 ipbfln2f;
+ u8 ippollfg;
+ u8 res2[3];
+} __packed;
+
+static void iucv_message_complete(struct iucv_irq_data *data)
+{
+ struct iucv_message_complete *imc = (void *) data;
+ struct iucv_path *path = iucv_path_table[imc->ippathid];
+ struct iucv_message msg;
+
+ if (path && path->handler && path->handler->message_complete) {
+ msg.flags = imc->ipflags1;
+ msg.id = imc->ipmsgid;
+ msg.audit = imc->ipaudit;
+ memcpy(msg.rmmsg, imc->iprmmsg, 8);
+ msg.class = imc->ipsrccls;
+ msg.tag = imc->ipmsgtag;
+ msg.length = imc->ipbfln2f;
+ path->handler->message_complete(path, &msg);
+ }
+}
+
+/**
+ * iucv_message_pending
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process message pending work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_message_pending {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ union {
+ u32 iprmmsg1_u32;
+ u8 iprmmsg1[4];
+ } ln1msg1;
+ union {
+ u32 ipbfln1f;
+ u8 iprmmsg2[4];
+ } ln1msg2;
+ u32 res1[3];
+ u32 ipbfln2f;
+ u8 ippollfg;
+ u8 res2[3];
+} __packed;
+
+static void iucv_message_pending(struct iucv_irq_data *data)
+{
+ struct iucv_message_pending *imp = (void *) data;
+ struct iucv_path *path = iucv_path_table[imp->ippathid];
+ struct iucv_message msg;
+
+ if (path && path->handler && path->handler->message_pending) {
+ msg.flags = imp->ipflags1;
+ msg.id = imp->ipmsgid;
+ msg.class = imp->iptrgcls;
+ if (imp->ipflags1 & IUCV_IPRMDATA) {
+ memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
+ msg.length = 8;
+ } else
+ msg.length = imp->ln1msg2.ipbfln1f;
+ msg.reply_size = imp->ipbfln2f;
+ path->handler->message_pending(path, &msg);
+ }
+}
+
+/**
+ * iucv_tasklet_fn:
+ *
+ * This tasklet loops over the queue of irq buffers created by
+ * iucv_external_interrupt, calls the appropriate action handler
+ * and then frees the buffer.
+ */
+static void iucv_tasklet_fn(unsigned long ignored)
+{
+ typedef void iucv_irq_fn(struct iucv_irq_data *);
+ static iucv_irq_fn *irq_fn[] = {
+ [0x02] = iucv_path_complete,
+ [0x03] = iucv_path_severed,
+ [0x04] = iucv_path_quiesced,
+ [0x05] = iucv_path_resumed,
+ [0x06] = iucv_message_complete,
+ [0x07] = iucv_message_complete,
+ [0x08] = iucv_message_pending,
+ [0x09] = iucv_message_pending,
+ };
+ LIST_HEAD(task_queue);
+ struct iucv_irq_list *p, *n;
+
+ /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
+ if (!spin_trylock(&iucv_table_lock)) {
+ tasklet_schedule(&iucv_tasklet);
+ return;
+ }
+ iucv_active_cpu = smp_processor_id();
+
+ spin_lock_irq(&iucv_queue_lock);
+ list_splice_init(&iucv_task_queue, &task_queue);
+ spin_unlock_irq(&iucv_queue_lock);
+
+ list_for_each_entry_safe(p, n, &task_queue, list) {
+ list_del_init(&p->list);
+ irq_fn[p->data.iptype](&p->data);
+ kfree(p);
+ }
+
+ iucv_active_cpu = -1;
+ spin_unlock(&iucv_table_lock);
+}
+
+/**
+ * iucv_work_fn:
+ *
+ * This work function loops over the queue of path pending irq blocks
+ * created by iucv_external_interrupt, calls the appropriate action
+ * handler and then frees the buffer.
+ */
+static void iucv_work_fn(struct work_struct *work)
+{
+ LIST_HEAD(work_queue);
+ struct iucv_irq_list *p, *n;
+
+ /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
+ spin_lock_bh(&iucv_table_lock);
+ iucv_active_cpu = smp_processor_id();
+
+ spin_lock_irq(&iucv_queue_lock);
+ list_splice_init(&iucv_work_queue, &work_queue);
+ spin_unlock_irq(&iucv_queue_lock);
+
+ iucv_cleanup_queue();
+ list_for_each_entry_safe(p, n, &work_queue, list) {
+ list_del_init(&p->list);
+ iucv_path_pending(&p->data);
+ kfree(p);
+ }
+
+ iucv_active_cpu = -1;
+ spin_unlock_bh(&iucv_table_lock);
+}
+
+/**
+ * iucv_external_interrupt
+ * @code: irq code
+ *
+ * Handles external interrupts coming in from CP.
+ * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
+ */
+static void iucv_external_interrupt(struct ext_code ext_code,
+ unsigned int param32, unsigned long param64)
+{
+ struct iucv_irq_data *p;
+ struct iucv_irq_list *work;
+
+ inc_irq_stat(IRQEXT_IUC);
+ p = iucv_irq_data[smp_processor_id()];
+ if (p->ippathid >= iucv_max_pathid) {
+ WARN_ON(p->ippathid >= iucv_max_pathid);
+ iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
+ return;
+ }
+ BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
+ work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
+ if (!work) {
+ pr_warn("iucv_external_interrupt: out of memory\n");
+ return;
+ }
+ memcpy(&work->data, p, sizeof(work->data));
+ spin_lock(&iucv_queue_lock);
+ if (p->iptype == 0x01) {
+ /* Path pending interrupt. */
+ list_add_tail(&work->list, &iucv_work_queue);
+ schedule_work(&iucv_work);
+ } else {
+ /* The other interrupts. */
+ list_add_tail(&work->list, &iucv_task_queue);
+ tasklet_schedule(&iucv_tasklet);
+ }
+ spin_unlock(&iucv_queue_lock);
+}
+
+static int iucv_pm_prepare(struct device *dev)
+{
+ int rc = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_INFO "iucv_pm_prepare\n");
+#endif
+ if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
+ rc = dev->driver->pm->prepare(dev);
+ return rc;
+}
+
+static void iucv_pm_complete(struct device *dev)
+{
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_INFO "iucv_pm_complete\n");
+#endif
+ if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
+ dev->driver->pm->complete(dev);
+}
+
+/**
+ * iucv_path_table_empty() - determine if iucv path table is empty
+ *
+ * Returns 0 if there are still iucv pathes defined
+ * 1 if there are no iucv pathes defined
+ */
+static int iucv_path_table_empty(void)
+{
+ int i;
+
+ for (i = 0; i < iucv_max_pathid; i++) {
+ if (iucv_path_table[i])
+ return 0;
+ }
+ return 1;
+}
+
+/**
+ * iucv_pm_freeze() - Freeze PM callback
+ * @dev: iucv-based device
+ *
+ * disable iucv interrupts
+ * invoke callback function of the iucv-based driver
+ * shut down iucv, if no iucv-pathes are established anymore
+ */
+static int iucv_pm_freeze(struct device *dev)
+{
+ int cpu;
+ struct iucv_irq_list *p, *n;
+ int rc = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "iucv_pm_freeze\n");
+#endif
+ if (iucv_pm_state != IUCV_PM_FREEZING) {
+ for_each_cpu(cpu, &iucv_irq_cpumask)
+ smp_call_function_single(cpu, iucv_block_cpu_almost,
+ NULL, 1);
+ cancel_work_sync(&iucv_work);
+ list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
+ list_del_init(&p->list);
+ iucv_sever_pathid(p->data.ippathid,
+ iucv_error_no_listener);
+ kfree(p);
+ }
+ }
+ iucv_pm_state = IUCV_PM_FREEZING;
+ if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
+ rc = dev->driver->pm->freeze(dev);
+ if (iucv_path_table_empty())
+ iucv_disable();
+ return rc;
+}
+
+/**
+ * iucv_pm_thaw() - Thaw PM callback
+ * @dev: iucv-based device
+ *
+ * make iucv ready for use again: allocate path table, declare interrupt buffers
+ * and enable iucv interrupts
+ * invoke callback function of the iucv-based driver
+ */
+static int iucv_pm_thaw(struct device *dev)
+{
+ int rc = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "iucv_pm_thaw\n");
+#endif
+ iucv_pm_state = IUCV_PM_THAWING;
+ if (!iucv_path_table) {
+ rc = iucv_enable();
+ if (rc)
+ goto out;
+ }
+ if (cpumask_empty(&iucv_irq_cpumask)) {
+ if (iucv_nonsmp_handler)
+ /* enable interrupts on one cpu */
+ iucv_allow_cpu(NULL);
+ else
+ /* enable interrupts on all cpus */
+ iucv_setmask_mp();
+ }
+ if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
+ rc = dev->driver->pm->thaw(dev);
+out:
+ return rc;
+}
+
+/**
+ * iucv_pm_restore() - Restore PM callback
+ * @dev: iucv-based device
+ *
+ * make iucv ready for use again: allocate path table, declare interrupt buffers
+ * and enable iucv interrupts
+ * invoke callback function of the iucv-based driver
+ */
+static int iucv_pm_restore(struct device *dev)
+{
+ int rc = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
+#endif
+ if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
+ pr_warn("Suspending Linux did not completely close all IUCV connections\n");
+ iucv_pm_state = IUCV_PM_RESTORING;
+ if (cpumask_empty(&iucv_irq_cpumask)) {
+ rc = iucv_query_maxconn();
+ rc = iucv_enable();
+ if (rc)
+ goto out;
+ }
+ if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
+ rc = dev->driver->pm->restore(dev);
+out:
+ return rc;
+}
+
+struct iucv_interface iucv_if = {
+ .message_receive = iucv_message_receive,
+ .__message_receive = __iucv_message_receive,
+ .message_reply = iucv_message_reply,
+ .message_reject = iucv_message_reject,
+ .message_send = iucv_message_send,
+ .__message_send = __iucv_message_send,
+ .message_send2way = iucv_message_send2way,
+ .message_purge = iucv_message_purge,
+ .path_accept = iucv_path_accept,
+ .path_connect = iucv_path_connect,
+ .path_quiesce = iucv_path_quiesce,
+ .path_resume = iucv_path_resume,
+ .path_sever = iucv_path_sever,
+ .iucv_register = iucv_register,
+ .iucv_unregister = iucv_unregister,
+ .bus = NULL,
+ .root = NULL,
+};
+EXPORT_SYMBOL(iucv_if);
+
+static enum cpuhp_state iucv_online;
+/**
+ * iucv_init
+ *
+ * Allocates and initializes various data structures.
+ */
+static int __init iucv_init(void)
+{
+ int rc;
+
+ if (!MACHINE_IS_VM) {
+ rc = -EPROTONOSUPPORT;
+ goto out;
+ }
+ ctl_set_bit(0, 1);
+ rc = iucv_query_maxconn();
+ if (rc)
+ goto out_ctl;
+ rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
+ if (rc)
+ goto out_ctl;
+ iucv_root = root_device_register("iucv");
+ if (IS_ERR(iucv_root)) {
+ rc = PTR_ERR(iucv_root);
+ goto out_int;
+ }
+
+ rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
+ iucv_cpu_prepare, iucv_cpu_dead);
+ if (rc)
+ goto out_dev;
+ rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
+ iucv_cpu_online, iucv_cpu_down_prep);
+ if (rc < 0)
+ goto out_prep;
+ iucv_online = rc;
+
+ rc = register_reboot_notifier(&iucv_reboot_notifier);
+ if (rc)
+ goto out_remove_hp;
+ ASCEBC(iucv_error_no_listener, 16);
+ ASCEBC(iucv_error_no_memory, 16);
+ ASCEBC(iucv_error_pathid, 16);
+ iucv_available = 1;
+ rc = bus_register(&iucv_bus);
+ if (rc)
+ goto out_reboot;
+ iucv_if.root = iucv_root;
+ iucv_if.bus = &iucv_bus;
+ return 0;
+
+out_reboot:
+ unregister_reboot_notifier(&iucv_reboot_notifier);
+out_remove_hp:
+ cpuhp_remove_state(iucv_online);
+out_prep:
+ cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
+out_dev:
+ root_device_unregister(iucv_root);
+out_int:
+ unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
+out_ctl:
+ ctl_clear_bit(0, 1);
+out:
+ return rc;
+}
+
+/**
+ * iucv_exit
+ *
+ * Frees everything allocated from iucv_init.
+ */
+static void __exit iucv_exit(void)
+{
+ struct iucv_irq_list *p, *n;
+
+ spin_lock_irq(&iucv_queue_lock);
+ list_for_each_entry_safe(p, n, &iucv_task_queue, list)
+ kfree(p);
+ list_for_each_entry_safe(p, n, &iucv_work_queue, list)
+ kfree(p);
+ spin_unlock_irq(&iucv_queue_lock);
+ unregister_reboot_notifier(&iucv_reboot_notifier);
+
+ cpuhp_remove_state_nocalls(iucv_online);
+ cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
+ root_device_unregister(iucv_root);
+ bus_unregister(&iucv_bus);
+ unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
+}
+
+subsys_initcall(iucv_init);
+module_exit(iucv_exit);
+
+MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
+MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 06:52:57 +0000