[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/net/iucv/af_iucv.c b/src/kernel/linux/v4.19/net/iucv/af_iucv.c
new file mode 100644
index 0000000..f024914
--- /dev/null
+++ b/src/kernel/linux/v4.19/net/iucv/af_iucv.c
@@ -0,0 +1,2528 @@
+/*
+ * 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/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;
+ }
+ 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);
+ 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)
+{
+ int err = 0;
+ int blen;
+ struct sk_buff *skb;
+ u8 shutdown = 0;
+
+ blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
+ 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) + ETH_HLEN;
+ 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) {
+ 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_type, 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_type, 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 int __init afiucv_init(void)
+{
+ int err;
+
+ if (MACHINE_IS_VM) {
+ cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
+ if (unlikely(err)) {
+ WARN_ON(err);
+ err = -EPROTONOSUPPORT;
+ goto out;
+ }
+
+ pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
+ if (!pr_iucv) {
+ printk(KERN_WARNING "iucv_if lookup failed\n");
+ memset(&iucv_userid, 0, sizeof(iucv_userid));
+ }
+ } else {
+ memset(&iucv_userid, 0, sizeof(iucv_userid));
+ pr_iucv = NULL;
+ }
+
+ err = proto_register(&iucv_proto, 0);
+ if (err)
+ goto out;
+ err = sock_register(&iucv_sock_family_ops);
+ if (err)
+ goto out_proto;
+
+ if (pr_iucv) {
+ err = afiucv_iucv_init();
+ if (err)
+ goto out_sock;
+ } else
+ register_netdevice_notifier(&afiucv_netdev_notifier);
+ dev_add_pack(&iucv_packet_type);
+ return 0;
+
+out_sock:
+ sock_unregister(PF_IUCV);
+out_proto:
+ proto_unregister(&iucv_proto);
+out:
+ if (pr_iucv)
+ symbol_put(iucv_if);
+ return err;
+}
+
+static void __exit afiucv_exit(void)
+{
+ if (pr_iucv) {
+ device_unregister(af_iucv_dev);
+ driver_unregister(&af_iucv_driver);
+ pr_iucv->iucv_unregister(&af_iucv_handler, 0);
+ symbol_put(iucv_if);
+ } else
+ unregister_netdevice_notifier(&afiucv_netdev_notifier);
+ dev_remove_pack(&iucv_packet_type);
+ sock_unregister(PF_IUCV);
+ proto_unregister(&iucv_proto);
+}
+
+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);