#include <net/iucv/iucv.h>
#include <net/iucv/af_iucv.h>
-#define CONFIG_IUCV_SOCK_DEBUG 1
-
-#define IPRMDATA 0x80
-#define VERSION "1.0"
+#define VERSION "1.1"
static char iucv_userid[80];
.obj_size = sizeof(struct iucv_sock),
};
+/* special AF_IUCV IPRM messages */
+static const u8 iprm_shutdown[8] =
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
+
static void iucv_sock_kill(struct sock *sk);
static void iucv_sock_close(struct sock *sk);
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 void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
static struct iucv_sock_list iucv_sk_list = {
.lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
.path_complete = iucv_callback_connack,
.path_severed = iucv_callback_connrej,
.message_pending = iucv_callback_rx,
- .message_complete = iucv_callback_txdone
+ .message_complete = iucv_callback_txdone,
+ .path_quiesced = iucv_callback_shutdown,
};
static inline void high_nmcpy(unsigned char *dst, char *src)
memcpy(&dst[8], src, 8);
}
+/**
+ * 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 substracting 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;
+}
+
/* Timers */
static void iucv_sock_timeout(unsigned long arg)
{
spin_lock_init(&iucv_sk(sk)->message_q.lock);
skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
iucv_sk(sk)->send_tag = 0;
+ iucv_sk(sk)->flags = 0;
sk->sk_destruct = iucv_sock_destruct;
sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
iucv = iucv_sk(sk);
/* Create path. */
iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
- IPRMDATA, GFP_KERNEL);
+ IUCV_IPRMDATA, GFP_KERNEL);
if (!iucv->path) {
err = -ENOMEM;
goto done;
}
if (sk->sk_state == IUCV_DISCONN) {
- release_sock(sk);
- return -ECONNREFUSED;
+ err = -ECONNREFUSED;
}
if (err) {
return 0;
}
+/**
+ * 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 iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
+ (void *) prmdata, 8);
+}
+
static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
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 (((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) {
+ iucv_path_sever(iucv->path, NULL);
+ skb_unlink(skb, &iucv->send_skb_q);
+ err = -EPIPE;
+ goto fail;
+ }
+ } else
+ err = iucv_message_send(iucv->path, &txmsg, 0, 0,
+ (void *) skb->data, skb->len);
if (err) {
if (err == 3) {
user_id[8] = 0;
struct iucv_message *msg)
{
int rc;
+ unsigned int len;
+
+ len = iucv_msg_length(msg);
- if (msg->flags & IPRMDATA) {
- skb->data = NULL;
- skb->len = 0;
+ /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
+ if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
+ if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
+ skb->data = NULL;
+ skb->len = 0;
+ }
} else {
- rc = iucv_message_receive(path, msg, 0, skb->data,
- msg->length, NULL);
+ rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
+ skb->data, len, NULL);
if (rc) {
kfree_skb(skb);
return;
}
if (skb->truesize >= sk->sk_rcvbuf / 4) {
- rc = iucv_fragment_skb(sk, skb, msg->length);
+ rc = iucv_fragment_skb(sk, skb, len);
kfree_skb(skb);
skb = NULL;
if (rc) {
} else {
skb_reset_transport_header(skb);
skb_reset_network_header(skb);
- skb->len = msg->length;
+ skb->len = len;
}
}
struct sock_msg_q *p, *n;
list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
- skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
+ skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
if (!skb)
break;
iucv_process_message(sk, skb, p->path, &p->msg);
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++;
txmsg.class = 0;
txmsg.tag = 0;
err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
- (void *) prmmsg, 8);
+ (void *) iprm_shutdown, 8);
if (err) {
switch (err) {
case 1:
return err;
}
+/* getsockopt and setsockopt */
+static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, 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;
+ 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);
+ int val, 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;
+ 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])
goto save_message;
len = atomic_read(&sk->sk_rmem_alloc);
- len += msg->length + sizeof(struct sk_buff);
+ len += iucv_msg_length(msg) + sizeof(struct sk_buff);
if (len > sk->sk_rcvbuf)
goto save_message;
- skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
+ skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
if (!skb)
goto save_message;
spin_unlock_irqrestore(&list->lock, flags);
- if (this)
- kfree_skb(this);
+ kfree_skb(this);
}
BUG_ON(!this);
sk->sk_state_change(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);
+}
+
static struct proto_ops iucv_sock_ops = {
.family = PF_IUCV,
.owner = THIS_MODULE,
.mmap = sock_no_mmap,
.socketpair = sock_no_socketpair,
.shutdown = iucv_sock_shutdown,
- .setsockopt = sock_no_setsockopt,
- .getsockopt = sock_no_getsockopt
+ .setsockopt = iucv_sock_setsockopt,
+ .getsockopt = iucv_sock_getsockopt,
};
static struct net_proto_family iucv_sock_family_ops = {
projects / cascardo / linux.git / blobdiff