--- /dev/null
+/*
+ * linux/net/iucv/af_iucv.c
+ *
+ * IUCV protocol stack for Linux on zSeries
+ *
+ * Copyright 2006 IBM Corporation
+ *
+ * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <net/sock.h>
+#include <asm/ebcdic.h>
+#include <asm/cpcmd.h>
+#include <linux/kmod.h>
+
+#include <net/iucv/iucv.h>
+#include <net/iucv/af_iucv.h>
+
+#define CONFIG_IUCV_SOCK_DEBUG 1
+
+#define IPRMDATA 0x80
+#define VERSION "1.0"
+
+static char iucv_userid[80];
+
+static struct proto_ops iucv_sock_ops;
+
+static struct proto iucv_proto = {
+ .name = "AF_IUCV",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct iucv_sock),
+};
+
+/* 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 ipuser[16]);
+static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]);
+static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
+
+static struct iucv_sock_list iucv_sk_list = {
+ .lock = RW_LOCK_UNLOCKED,
+ .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
+};
+
+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);
+}
+
+/* Timers */
+static void iucv_sock_timeout(unsigned long arg)
+{
+ struct sock *sk = (struct sock *)arg;
+
+ bh_lock_sock(sk);
+ sk->sk_err = ETIMEDOUT;
+ sk->sk_state_change(sk);
+ bh_unlock_sock(sk);
+
+ iucv_sock_kill(sk);
+ sock_put(sk);
+}
+
+static void iucv_sock_clear_timer(struct sock *sk)
+{
+ sk_stop_timer(sk, &sk->sk_timer);
+}
+
+static void iucv_sock_init_timer(struct sock *sk)
+{
+ init_timer(&sk->sk_timer);
+ sk->sk_timer.function = iucv_sock_timeout;
+ sk->sk_timer.data = (unsigned long)sk;
+}
+
+static struct sock *__iucv_get_sock_by_name(char *nm)
+{
+ struct sock *sk;
+ struct hlist_node *node;
+
+ sk_for_each(sk, node, &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_write_queue);
+}
+
+/* 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;
+ sock_set_flag(parent, SOCK_ZAPPED);
+}
+
+/* Kill socket */
+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);
+}
+
+/* Close an IUCV socket */
+static void iucv_sock_close(struct sock *sk)
+{
+ unsigned char user_data[16];
+ struct iucv_sock *iucv = iucv_sk(sk);
+ int err;
+
+ iucv_sock_clear_timer(sk);
+ lock_sock(sk);
+
+ switch(sk->sk_state) {
+ case IUCV_LISTEN:
+ iucv_sock_cleanup_listen(sk);
+ break;
+
+ case IUCV_CONNECTED:
+ case IUCV_DISCONN:
+ err = 0;
+ if (iucv->path) {
+ low_nmcpy(user_data, iucv->src_name);
+ high_nmcpy(user_data, iucv->dst_name);
+ ASCEBC(user_data, sizeof(user_data));
+ err = iucv_path_sever(iucv->path, user_data);
+ iucv_path_free(iucv->path);
+ iucv->path = NULL;
+ }
+
+ 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);
+
+ sock_set_flag(sk, SOCK_ZAPPED);
+ break;
+
+ default:
+ sock_set_flag(sk, SOCK_ZAPPED);
+ break;
+ };
+
+ release_sock(sk);
+ iucv_sock_kill(sk);
+}
+
+static void iucv_sock_init(struct sock *sk, struct sock *parent)
+{
+ if (parent)
+ sk->sk_type = parent->sk_type;
+}
+
+static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
+{
+ struct sock *sk;
+
+ sk = sk_alloc(PF_IUCV, prio, &iucv_proto, 1);
+ if (!sk)
+ return NULL;
+
+ sock_init_data(sock, sk);
+ INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
+ skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
+ iucv_sk(sk)->send_tag = 0;
+
+ 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_init_timer(sk);
+
+ iucv_sock_link(&iucv_sk_list, sk);
+ return sk;
+}
+
+/* Create an IUCV socket */
+static int iucv_sock_create(struct socket *sock, int protocol)
+{
+ struct sock *sk;
+
+ if (sock->type != SOCK_STREAM)
+ return -ESOCKTNOSUPPORT;
+
+ sock->state = SS_UNCONNECTED;
+ sock->ops = &iucv_sock_ops;
+
+ sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
+ 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)
+{
+ sock_hold(sk);
+ list_add_tail(&iucv_sk(sk)->accept_q, &iucv_sk(parent)->accept_q);
+ iucv_sk(sk)->parent = parent;
+ parent->sk_ack_backlog++;
+}
+
+void iucv_accept_unlink(struct sock *sk)
+{
+ list_del_init(&iucv_sk(sk)->accept_q);
+ iucv_sk(sk)->parent->sk_ack_backlog--;
+ 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) {
+ release_sock(sk);
+ iucv_accept_unlink(sk);
+ continue;
+ }
+
+ if (sk->sk_state == IUCV_CONNECTED ||
+ sk->sk_state == IUCV_SEVERED ||
+ !newsock) {
+ iucv_accept_unlink(sk);
+ if (newsock)
+ sock_graft(sk, newsock);
+
+ if (sk->sk_state == IUCV_SEVERED)
+ sk->sk_state = IUCV_DISCONN;
+
+ release_sock(sk);
+ return sk;
+ }
+
+ release_sock(sk);
+ }
+ return NULL;
+}
+
+int iucv_sock_wait_state(struct sock *sk, int state, int state2,
+ unsigned long timeo)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ int err = 0;
+
+ add_wait_queue(sk->sk_sleep, &wait);
+ while (sk->sk_state != state && sk->sk_state != state2) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ if (!timeo) {
+ err = -EAGAIN;
+ break;
+ }
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ break;
+ }
+
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock(sk);
+
+ err = sock_error(sk);
+ if (err)
+ break;
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(sk->sk_sleep, &wait);
+ return err;
+}
+
+/* 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;
+
+ /* Verify the input sockaddr */
+ if (!addr || addr->sa_family != AF_IUCV)
+ return -EINVAL;
+
+ lock_sock(sk);
+ if (sk->sk_state != IUCV_OPEN) {
+ err = -EBADFD;
+ goto done;
+ }
+
+ write_lock_bh(&iucv_sk_list.lock);
+
+ iucv = iucv_sk(sk);
+ if (__iucv_get_sock_by_name(sa->siucv_name)) {
+ err = -EADDRINUSE;
+ goto done_unlock;
+ }
+ if (iucv->path) {
+ err = 0;
+ goto done_unlock;
+ }
+
+ /* Bind the socket */
+ memcpy(iucv->src_name, sa->siucv_name, 8);
+
+ /* Copy the user id */
+ memcpy(iucv->src_user_id, iucv_userid, 8);
+ sk->sk_state = IUCV_BOUND;
+ err = 0;
+
+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);
+ char query_buffer[80];
+ char name[12];
+ int err = 0;
+
+ /* Set the userid and name */
+ cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
+ if (unlikely(err))
+ return -EPROTO;
+
+ memcpy(iucv->src_user_id, query_buffer, 8);
+
+ write_lock_bh(&iucv_sk_list.lock);
+
+ sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
+ while (__iucv_get_sock_by_name(name)) {
+ sprintf(name, "%08x",
+ atomic_inc_return(&iucv_sk_list.autobind_name));
+ }
+
+ write_unlock_bh(&iucv_sk_list.lock);
+
+ memcpy(&iucv->src_name, name, 8);
+
+ 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;
+ unsigned char user_data[16];
+ int err;
+
+ if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
+ return -EINVAL;
+
+ if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
+ return -EBADFD;
+
+ if (sk->sk_type != SOCK_STREAM)
+ return -EINVAL;
+
+ iucv = iucv_sk(sk);
+
+ 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_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
+ memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
+
+ high_nmcpy(user_data, sa->siucv_name);
+ low_nmcpy(user_data, iucv_sk(sk)->src_name);
+ ASCEBC(user_data, sizeof(user_data));
+
+ iucv = iucv_sk(sk);
+ /* Create path. */
+ iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
+ IPRMDATA, GFP_KERNEL);
+ err = 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;
+ err = -ECONNREFUSED;
+ goto done;
+ }
+
+ if (sk->sk_state != IUCV_CONNECTED) {
+ err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
+ sock_sndtimeo(sk, flags & O_NONBLOCK));
+ }
+
+ if (sk->sk_state == IUCV_DISCONN) {
+ release_sock(sk);
+ return -ECONNREFUSED;
+ }
+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 || sock->type != SOCK_STREAM)
+ 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)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ struct sock *sk = sock->sk, *nsk;
+ long timeo;
+ int err = 0;
+
+ lock_sock(sk);
+
+ 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->sk_sleep, &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(sk);
+
+ 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->sk_sleep, &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 *len, int peer)
+{
+ struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
+ struct sock *sk = sock->sk;
+
+ addr->sa_family = AF_IUCV;
+ *len = sizeof(struct sockaddr_iucv);
+
+ if (peer) {
+ memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
+ memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
+ } else {
+ memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
+ memcpy(siucv->siucv_name, iucv_sk(sk)->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 0;
+}
+
+static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len)
+{
+ struct sock *sk = sock->sk;
+ struct iucv_sock *iucv = iucv_sk(sk);
+ struct sk_buff *skb;
+ struct iucv_message txmsg;
+ int err;
+
+ err = sock_error(sk);
+ if (err)
+ return err;
+
+ if (msg->msg_flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ lock_sock(sk);
+
+ if (sk->sk_shutdown & SEND_SHUTDOWN) {
+ err = -EPIPE;
+ goto out;
+ }
+
+ if (sk->sk_state == IUCV_CONNECTED){
+ if(!(skb = sock_alloc_send_skb(sk, len,
+ msg->msg_flags & MSG_DONTWAIT,
+ &err)))
+ return err;
+
+ if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)){
+ err = -EFAULT;
+ goto fail;
+ }
+
+ txmsg.class = 0;
+ txmsg.tag = iucv->send_tag++;
+ memcpy(skb->cb, &txmsg.tag, 4);
+ skb_queue_tail(&iucv->send_skb_q, skb);
+ err = iucv_message_send(iucv->path, &txmsg, 0, 0,
+ (void *) skb->data, skb->len);
+ if (err) {
+ if (err == 3)
+ printk(KERN_ERR "AF_IUCV msg limit exceeded\n");
+ skb_unlink(skb, &iucv->send_skb_q);
+ err = -EPIPE;
+ goto fail;
+ }
+
+ } else {
+ err = -ENOTCONN;
+ goto out;
+ }
+
+ release_sock(sk);
+ return len;
+
+fail:
+ kfree_skb(skb);
+out:
+ release_sock(sk);
+ return err;
+}
+
+static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len, int flags)
+{
+ int noblock = flags & MSG_DONTWAIT;
+ struct sock *sk = sock->sk;
+ int target, copied = 0;
+ struct sk_buff *skb;
+ int err = 0;
+
+ if (flags & (MSG_OOB))
+ return -EOPNOTSUPP;
+
+ target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb) {
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ return 0;
+ return err;
+ }
+
+ copied = min_t(unsigned int, skb->len, len);
+
+ if (memcpy_toiovec(msg->msg_iov, skb->data, copied)) {
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ if (copied == 0)
+ return -EFAULT;
+ }
+
+ len -= copied;
+
+ /* Mark read part of skb as used */
+ if (!(flags & MSG_PEEK)) {
+ skb_pull(skb, copied);
+
+ if (skb->len) {
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ goto done;
+ }
+
+ kfree_skb(skb);
+ } else
+ skb_queue_head(&sk->sk_receive_queue, skb);
+
+done:
+ return err ? : copied;
+}
+
+static inline unsigned int iucv_accept_poll(struct sock *parent)
+{
+ struct iucv_sock *isk, *n;
+ struct sock *sk;
+
+ list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q){
+ sk = (struct sock *) isk;
+
+ if (sk->sk_state == IUCV_CONNECTED)
+ return POLLIN | POLLRDNORM;
+ }
+
+ return 0;
+}
+
+unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
+ poll_table *wait)
+{
+ struct sock *sk = sock->sk;
+ unsigned int mask = 0;
+
+ poll_wait(file, sk->sk_sleep, wait);
+
+ if (sk->sk_state == IUCV_LISTEN)
+ return iucv_accept_poll(sk);
+
+ if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
+ mask |= POLLERR;
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ mask |= POLLRDHUP;
+
+ if (sk->sk_shutdown == SHUTDOWN_MASK)
+ mask |= POLLHUP;
+
+ if (!skb_queue_empty(&sk->sk_receive_queue) ||
+ (sk->sk_shutdown & RCV_SHUTDOWN))
+ mask |= POLLIN | POLLRDNORM;
+
+ if (sk->sk_state == IUCV_CLOSED)
+ mask |= POLLHUP;
+
+ if (sock_writeable(sk))
+ mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
+ else
+ set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+
+ 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;
+ u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
+
+ how++;
+
+ if ((how & ~SHUTDOWN_MASK) || !how)
+ return -EINVAL;
+
+ lock_sock(sk);
+ switch(sk->sk_state) {
+ case IUCV_CLOSED:
+ err = -ENOTCONN;
+ goto fail;
+
+ default:
+ sk->sk_shutdown |= how;
+ break;
+ }
+
+ if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
+ txmsg.class = 0;
+ txmsg.tag = 0;
+ err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
+ (void *) prmmsg, 8);
+ if (err) {
+ switch(err) {
+ case 1:
+ err = -ENOTCONN;
+ break;
+ case 2:
+ err = -ECONNRESET;
+ break;
+ default:
+ err = -ENOTCONN;
+ break;
+ }
+ }
+ }
+
+ if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
+ err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
+ if (err)
+ err = -ENOTCONN;
+
+ 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);
+
+ /* Unregister with IUCV base support */
+ if (iucv_sk(sk)->path) {
+ iucv_path_sever(iucv_sk(sk)->path, NULL);
+ iucv_path_free(iucv_sk(sk)->path);
+ iucv_sk(sk)->path = NULL;
+ }
+
+ if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime){
+ lock_sock(sk);
+ err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0,
+ sk->sk_lingertime);
+ release_sock(sk);
+ }
+
+ sock_orphan(sk);
+ iucv_sock_kill(sk);
+ return err;
+}
+
+/* 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 hlist_node *node;
+ 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_for_each(sk, node, &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 = iucv_path_sever(path, user_data);
+ goto fail;
+ }
+
+ /* Check for backlog size */
+ if (sk_acceptq_is_full(sk)) {
+ err = iucv_path_sever(path, user_data);
+ goto fail;
+ }
+
+ /* Create the new socket */
+ nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
+ if (!nsk){
+ err = iucv_path_sever(path, user_data);
+ 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);
+
+ path->msglim = IUCV_QUEUELEN_DEFAULT;
+ err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
+ if (err){
+ err = iucv_path_sever(path, user_data);
+ goto fail;
+ }
+
+ iucv_accept_enqueue(sk, nsk);
+
+ /* Wake up accept */
+ nsk->sk_state = IUCV_CONNECTED;
+ sk->sk_data_ready(sk, 1);
+ err = 0;
+fail:
+ bh_unlock_sock(sk);
+ return 0;
+}
+
+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 sk_buff *skb;
+ int rc;
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ return;
+
+ skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
+ if (!skb) {
+ iucv_message_reject(path, msg);
+ return;
+ }
+
+ if (msg->flags & IPRMDATA) {
+ skb->data = NULL;
+ skb->len = 0;
+ } else {
+ rc = iucv_message_receive(path, msg, 0, skb->data,
+ msg->length, NULL);
+ if (rc) {
+ kfree_skb(skb);
+ return;
+ }
+
+ skb->h.raw = skb->data;
+ skb->nh.raw = skb->data;
+ skb->len = msg->length;
+ }
+
+ if (sock_queue_rcv_skb(sk, skb))
+ kfree_skb(skb);
+}
+
+static void iucv_callback_txdone(struct iucv_path *path,
+ struct iucv_message *msg)
+{
+ struct sock *sk = path->private;
+ struct sk_buff *this;
+ struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
+ struct sk_buff *list_skb = list->next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&list->lock, flags);
+
+ do {
+ this = list_skb;
+ list_skb = list_skb->next;
+ } while (memcmp(&msg->tag, this->cb, 4));
+
+ spin_unlock_irqrestore(&list->lock, flags);
+
+ skb_unlink(this, &iucv_sk(sk)->send_skb_q);
+ kfree_skb(this);
+}
+
+static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
+{
+ struct sock *sk = path->private;
+
+ if (!list_empty(&iucv_sk(sk)->accept_q))
+ sk->sk_state = IUCV_SEVERED;
+ else
+ sk->sk_state = IUCV_DISCONN;
+
+ sk->sk_state_change(sk);
+}
+
+static 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 = sock_no_setsockopt,
+ .getsockopt = sock_no_getsockopt
+};
+
+static struct net_proto_family iucv_sock_family_ops = {
+ .family = AF_IUCV,
+ .owner = THIS_MODULE,
+ .create = iucv_sock_create,
+};
+
+static int afiucv_init(void)
+{
+ int err;
+
+ if (!MACHINE_IS_VM) {
+ printk(KERN_ERR "AF_IUCV connection needs VM as base\n");
+ err = -EPROTONOSUPPORT;
+ goto out;
+ }
+ cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
+ if (unlikely(err)) {
+ printk(KERN_ERR "AF_IUCV needs the VM userid\n");
+ err = -EPROTONOSUPPORT;
+ goto out;
+ }
+
+ err = iucv_register(&af_iucv_handler, 0);
+ if (err)
+ goto out;
+ err = proto_register(&iucv_proto, 0);
+ if (err)
+ goto out_iucv;
+ err = sock_register(&iucv_sock_family_ops);
+ if (err)
+ goto out_proto;
+ printk(KERN_INFO "AF_IUCV lowlevel driver initialized\n");
+ return 0;
+
+out_proto:
+ proto_unregister(&iucv_proto);
+out_iucv:
+ iucv_unregister(&af_iucv_handler, 0);
+out:
+ return err;
+}
+
+static void __exit afiucv_exit(void)
+{
+ sock_unregister(PF_IUCV);
+ proto_unregister(&iucv_proto);
+ iucv_unregister(&af_iucv_handler, 0);
+
+ printk(KERN_INFO "AF_IUCV lowlevel driver unloaded\n");
+}
+
+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);
projects / linux-drm-fsl-dcu.git / commitdiff