2 * IUCV protocol stack for Linux on zSeries
4 * Copyright IBM Corp. 2006, 2009
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
9 * Ursula Braun <ursula.braun@de.ibm.com>
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
26 #include <asm/ebcdic.h>
27 #include <asm/cpcmd.h>
28 #include <linux/kmod.h>
30 #include <net/iucv/af_iucv.h>
34 static char iucv_userid[80];
36 static const struct proto_ops iucv_sock_ops;
38 static struct proto iucv_proto = {
41 .obj_size = sizeof(struct iucv_sock),
44 static struct iucv_interface *pr_iucv;
46 /* special AF_IUCV IPRM messages */
47 static const u8 iprm_shutdown[8] =
48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
52 /* macros to set/get socket control buffer at correct offset */
53 #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */
54 #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag))
55 #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
56 #define CB_TRGCLS_LEN (TRGCLS_SIZE)
58 #define __iucv_sock_wait(sk, condition, timeo, ret) \
60 DEFINE_WAIT(__wait); \
61 long __timeo = timeo; \
63 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
64 while (!(condition)) { \
69 if (signal_pending(current)) { \
70 ret = sock_intr_errno(__timeo); \
74 __timeo = schedule_timeout(__timeo); \
76 ret = sock_error(sk); \
80 finish_wait(sk_sleep(sk), &__wait); \
83 #define iucv_sock_wait(sk, condition, timeo) \
87 __iucv_sock_wait(sk, condition, timeo, __ret); \
91 static void iucv_sock_kill(struct sock *sk);
92 static void iucv_sock_close(struct sock *sk);
94 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
95 struct packet_type *pt, struct net_device *orig_dev);
96 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
97 struct sk_buff *skb, u8 flags);
98 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
100 /* Call Back functions */
101 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
102 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
103 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
104 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
106 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
107 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
109 static struct iucv_sock_list iucv_sk_list = {
110 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
111 .autobind_name = ATOMIC_INIT(0)
114 static struct iucv_handler af_iucv_handler = {
115 .path_pending = iucv_callback_connreq,
116 .path_complete = iucv_callback_connack,
117 .path_severed = iucv_callback_connrej,
118 .message_pending = iucv_callback_rx,
119 .message_complete = iucv_callback_txdone,
120 .path_quiesced = iucv_callback_shutdown,
123 static inline void high_nmcpy(unsigned char *dst, char *src)
128 static inline void low_nmcpy(unsigned char *dst, char *src)
130 memcpy(&dst[8], src, 8);
133 static void iucv_skb_queue_purge(struct sk_buff_head *list)
137 while ((skb = skb_dequeue(list)) != NULL) {
144 static int afiucv_pm_prepare(struct device *dev)
146 #ifdef CONFIG_PM_DEBUG
147 printk(KERN_WARNING "afiucv_pm_prepare\n");
152 static void afiucv_pm_complete(struct device *dev)
154 #ifdef CONFIG_PM_DEBUG
155 printk(KERN_WARNING "afiucv_pm_complete\n");
160 * afiucv_pm_freeze() - Freeze PM callback
161 * @dev: AFIUCV dummy device
163 * Sever all established IUCV communication pathes
165 static int afiucv_pm_freeze(struct device *dev)
167 struct iucv_sock *iucv;
169 struct hlist_node *node;
172 #ifdef CONFIG_PM_DEBUG
173 printk(KERN_WARNING "afiucv_pm_freeze\n");
175 read_lock(&iucv_sk_list.lock);
176 sk_for_each(sk, node, &iucv_sk_list.head) {
178 iucv_skb_queue_purge(&iucv->send_skb_q);
179 skb_queue_purge(&iucv->backlog_skb_q);
180 switch (sk->sk_state) {
185 err = pr_iucv->path_sever(iucv->path, NULL);
186 iucv_path_free(iucv->path);
198 read_unlock(&iucv_sk_list.lock);
203 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
204 * @dev: AFIUCV dummy device
206 * socket clean up after freeze
208 static int afiucv_pm_restore_thaw(struct device *dev)
211 struct hlist_node *node;
213 #ifdef CONFIG_PM_DEBUG
214 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
216 read_lock(&iucv_sk_list.lock);
217 sk_for_each(sk, node, &iucv_sk_list.head) {
218 switch (sk->sk_state) {
221 sk->sk_state = IUCV_DISCONN;
222 sk->sk_state_change(sk);
233 read_unlock(&iucv_sk_list.lock);
237 static const struct dev_pm_ops afiucv_pm_ops = {
238 .prepare = afiucv_pm_prepare,
239 .complete = afiucv_pm_complete,
240 .freeze = afiucv_pm_freeze,
241 .thaw = afiucv_pm_restore_thaw,
242 .restore = afiucv_pm_restore_thaw,
245 static struct device_driver af_iucv_driver = {
246 .owner = THIS_MODULE,
249 .pm = &afiucv_pm_ops,
252 /* dummy device used as trigger for PM functions */
253 static struct device *af_iucv_dev;
256 * iucv_msg_length() - Returns the length of an iucv message.
257 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
259 * The function returns the length of the specified iucv message @msg of data
260 * stored in a buffer and of data stored in the parameter list (PRMDATA).
262 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
264 * PRMDATA[0..6] socket data (max 7 bytes);
265 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
267 * The socket data length is computed by subtracting the socket data length
269 * If the socket data len is greater 7, then PRMDATA can be used for special
270 * notifications (see iucv_sock_shutdown); and further,
271 * if the socket data len is > 7, the function returns 8.
273 * Use this function to allocate socket buffers to store iucv message data.
275 static inline size_t iucv_msg_length(struct iucv_message *msg)
279 if (msg->flags & IUCV_IPRMDATA) {
280 datalen = 0xff - msg->rmmsg[7];
281 return (datalen < 8) ? datalen : 8;
287 * iucv_sock_in_state() - check for specific states
288 * @sk: sock structure
289 * @state: first iucv sk state
290 * @state: second iucv sk state
292 * Returns true if the socket in either in the first or second state.
294 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
296 return (sk->sk_state == state || sk->sk_state == state2);
300 * iucv_below_msglim() - function to check if messages can be sent
301 * @sk: sock structure
303 * Returns true if the send queue length is lower than the message limit.
304 * Always returns true if the socket is not connected (no iucv path for
305 * checking the message limit).
307 static inline int iucv_below_msglim(struct sock *sk)
309 struct iucv_sock *iucv = iucv_sk(sk);
311 if (sk->sk_state != IUCV_CONNECTED)
313 if (iucv->transport == AF_IUCV_TRANS_IUCV)
314 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
316 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
317 (atomic_read(&iucv->pendings) <= 0));
321 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
323 static void iucv_sock_wake_msglim(struct sock *sk)
325 struct socket_wq *wq;
328 wq = rcu_dereference(sk->sk_wq);
329 if (wq_has_sleeper(wq))
330 wake_up_interruptible_all(&wq->wait);
331 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
336 * afiucv_hs_send() - send a message through HiperSockets transport
338 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
339 struct sk_buff *skb, u8 flags)
341 struct net *net = sock_net(sock);
342 struct iucv_sock *iucv = iucv_sk(sock);
343 struct af_iucv_trans_hdr *phs_hdr;
344 struct sk_buff *nskb;
345 int err, confirm_recv = 0;
347 memset(skb->head, 0, ETH_HLEN);
348 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
349 sizeof(struct af_iucv_trans_hdr));
350 skb_reset_mac_header(skb);
351 skb_reset_network_header(skb);
352 skb_push(skb, ETH_HLEN);
353 skb_reset_mac_header(skb);
354 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
356 phs_hdr->magic = ETH_P_AF_IUCV;
357 phs_hdr->version = 1;
358 phs_hdr->flags = flags;
359 if (flags == AF_IUCV_FLAG_SYN)
360 phs_hdr->window = iucv->msglimit;
361 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
362 confirm_recv = atomic_read(&iucv->msg_recv);
363 phs_hdr->window = confirm_recv;
365 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
367 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
368 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
369 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
370 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
371 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
372 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
373 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
374 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
376 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
378 skb->dev = dev_get_by_index(net, sock->sk_bound_dev_if);
381 if (!(skb->dev->flags & IFF_UP))
383 if (skb->len > skb->dev->mtu) {
384 if (sock->sk_type == SOCK_SEQPACKET)
387 skb_trim(skb, skb->dev->mtu);
389 skb->protocol = ETH_P_AF_IUCV;
390 skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF;
391 nskb = skb_clone(skb, GFP_ATOMIC);
394 skb_queue_tail(&iucv->send_skb_q, nskb);
395 err = dev_queue_xmit(skb);
397 skb_unlink(nskb, &iucv->send_skb_q);
401 atomic_sub(confirm_recv, &iucv->msg_recv);
402 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
407 static struct sock *__iucv_get_sock_by_name(char *nm)
410 struct hlist_node *node;
412 sk_for_each(sk, node, &iucv_sk_list.head)
413 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
419 static void iucv_sock_destruct(struct sock *sk)
421 skb_queue_purge(&sk->sk_receive_queue);
422 skb_queue_purge(&sk->sk_write_queue);
426 static void iucv_sock_cleanup_listen(struct sock *parent)
430 /* Close non-accepted connections */
431 while ((sk = iucv_accept_dequeue(parent, NULL))) {
436 parent->sk_state = IUCV_CLOSED;
439 /* Kill socket (only if zapped and orphaned) */
440 static void iucv_sock_kill(struct sock *sk)
442 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
445 iucv_sock_unlink(&iucv_sk_list, sk);
446 sock_set_flag(sk, SOCK_DEAD);
450 /* Close an IUCV socket */
451 static void iucv_sock_close(struct sock *sk)
453 unsigned char user_data[16];
454 struct iucv_sock *iucv = iucv_sk(sk);
461 switch (sk->sk_state) {
463 iucv_sock_cleanup_listen(sk);
467 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
469 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
470 skb = sock_alloc_send_skb(sk, blen, 1, &err);
472 skb_reserve(skb, blen);
473 err = afiucv_hs_send(NULL, sk, skb,
476 sk->sk_state = IUCV_DISCONN;
477 sk->sk_state_change(sk);
479 case IUCV_DISCONN: /* fall through */
480 sk->sk_state = IUCV_CLOSING;
481 sk->sk_state_change(sk);
483 if (!skb_queue_empty(&iucv->send_skb_q)) {
484 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
485 timeo = sk->sk_lingertime;
487 timeo = IUCV_DISCONN_TIMEOUT;
489 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
493 case IUCV_CLOSING: /* fall through */
494 sk->sk_state = IUCV_CLOSED;
495 sk->sk_state_change(sk);
498 low_nmcpy(user_data, iucv->src_name);
499 high_nmcpy(user_data, iucv->dst_name);
500 ASCEBC(user_data, sizeof(user_data));
501 pr_iucv->path_sever(iucv->path, user_data);
502 iucv_path_free(iucv->path);
506 sk->sk_err = ECONNRESET;
507 sk->sk_state_change(sk);
509 iucv_skb_queue_purge(&iucv->send_skb_q);
510 skb_queue_purge(&iucv->backlog_skb_q);
514 /* nothing to do here */
518 /* mark socket for deletion by iucv_sock_kill() */
519 sock_set_flag(sk, SOCK_ZAPPED);
524 static void iucv_sock_init(struct sock *sk, struct sock *parent)
527 sk->sk_type = parent->sk_type;
530 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
533 struct iucv_sock *iucv;
535 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
540 sock_init_data(sock, sk);
541 INIT_LIST_HEAD(&iucv->accept_q);
542 spin_lock_init(&iucv->accept_q_lock);
543 skb_queue_head_init(&iucv->send_skb_q);
544 INIT_LIST_HEAD(&iucv->message_q.list);
545 spin_lock_init(&iucv->message_q.lock);
546 skb_queue_head_init(&iucv->backlog_skb_q);
548 atomic_set(&iucv->pendings, 0);
551 atomic_set(&iucv->msg_sent, 0);
552 atomic_set(&iucv->msg_recv, 0);
554 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
555 memset(&iucv->src_user_id , 0, 32);
557 iucv->transport = AF_IUCV_TRANS_IUCV;
559 iucv->transport = AF_IUCV_TRANS_HIPER;
561 sk->sk_destruct = iucv_sock_destruct;
562 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
563 sk->sk_allocation = GFP_DMA;
565 sock_reset_flag(sk, SOCK_ZAPPED);
567 sk->sk_protocol = proto;
568 sk->sk_state = IUCV_OPEN;
570 iucv_sock_link(&iucv_sk_list, sk);
574 /* Create an IUCV socket */
575 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
580 if (protocol && protocol != PF_IUCV)
581 return -EPROTONOSUPPORT;
583 sock->state = SS_UNCONNECTED;
585 switch (sock->type) {
587 sock->ops = &iucv_sock_ops;
590 /* currently, proto ops can handle both sk types */
591 sock->ops = &iucv_sock_ops;
594 return -ESOCKTNOSUPPORT;
597 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
601 iucv_sock_init(sk, NULL);
606 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
608 write_lock_bh(&l->lock);
609 sk_add_node(sk, &l->head);
610 write_unlock_bh(&l->lock);
613 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
615 write_lock_bh(&l->lock);
616 sk_del_node_init(sk);
617 write_unlock_bh(&l->lock);
620 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
623 struct iucv_sock *par = iucv_sk(parent);
626 spin_lock_irqsave(&par->accept_q_lock, flags);
627 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
628 spin_unlock_irqrestore(&par->accept_q_lock, flags);
629 iucv_sk(sk)->parent = parent;
630 sk_acceptq_added(parent);
633 void iucv_accept_unlink(struct sock *sk)
636 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
638 spin_lock_irqsave(&par->accept_q_lock, flags);
639 list_del_init(&iucv_sk(sk)->accept_q);
640 spin_unlock_irqrestore(&par->accept_q_lock, flags);
641 sk_acceptq_removed(iucv_sk(sk)->parent);
642 iucv_sk(sk)->parent = NULL;
646 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
648 struct iucv_sock *isk, *n;
651 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
652 sk = (struct sock *) isk;
655 if (sk->sk_state == IUCV_CLOSED) {
656 iucv_accept_unlink(sk);
661 if (sk->sk_state == IUCV_CONNECTED ||
662 sk->sk_state == IUCV_DISCONN ||
664 iucv_accept_unlink(sk);
666 sock_graft(sk, newsock);
677 /* Bind an unbound socket */
678 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
681 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
682 struct sock *sk = sock->sk;
683 struct iucv_sock *iucv;
685 struct net_device *dev;
688 /* Verify the input sockaddr */
689 if (!addr || addr->sa_family != AF_IUCV)
693 if (sk->sk_state != IUCV_OPEN) {
698 write_lock_bh(&iucv_sk_list.lock);
701 if (__iucv_get_sock_by_name(sa->siucv_name)) {
708 /* Bind the socket */
711 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
712 goto vm_bind; /* VM IUCV transport */
714 /* try hiper transport */
715 memcpy(uid, sa->siucv_user_id, sizeof(uid));
718 for_each_netdev_rcu(&init_net, dev) {
719 if (!memcmp(dev->perm_addr, uid, 8)) {
720 memcpy(iucv->src_name, sa->siucv_name, 8);
721 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
722 sk->sk_bound_dev_if = dev->ifindex;
723 sk->sk_state = IUCV_BOUND;
724 iucv->transport = AF_IUCV_TRANS_HIPER;
726 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
734 /* use local userid for backward compat */
735 memcpy(iucv->src_name, sa->siucv_name, 8);
736 memcpy(iucv->src_user_id, iucv_userid, 8);
737 sk->sk_state = IUCV_BOUND;
738 iucv->transport = AF_IUCV_TRANS_IUCV;
740 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
743 /* found no dev to bind */
746 /* Release the socket list lock */
747 write_unlock_bh(&iucv_sk_list.lock);
753 /* Automatically bind an unbound socket */
754 static int iucv_sock_autobind(struct sock *sk)
756 struct iucv_sock *iucv = iucv_sk(sk);
760 if (unlikely(!pr_iucv))
763 memcpy(iucv->src_user_id, iucv_userid, 8);
765 write_lock_bh(&iucv_sk_list.lock);
767 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
768 while (__iucv_get_sock_by_name(name)) {
769 sprintf(name, "%08x",
770 atomic_inc_return(&iucv_sk_list.autobind_name));
773 write_unlock_bh(&iucv_sk_list.lock);
775 memcpy(&iucv->src_name, name, 8);
778 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
783 static int afiucv_hs_connect(struct socket *sock)
785 struct sock *sk = sock->sk;
787 int blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
791 skb = sock_alloc_send_skb(sk, blen, 1, &err);
797 skb_reserve(skb, blen);
798 err = afiucv_hs_send(NULL, sk, skb, AF_IUCV_FLAG_SYN);
803 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
805 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
806 struct sock *sk = sock->sk;
807 struct iucv_sock *iucv = iucv_sk(sk);
808 unsigned char user_data[16];
811 high_nmcpy(user_data, sa->siucv_name);
812 low_nmcpy(user_data, iucv->src_name);
813 ASCEBC(user_data, sizeof(user_data));
816 iucv->path = iucv_path_alloc(iucv->msglimit,
817 IUCV_IPRMDATA, GFP_KERNEL);
822 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
823 sa->siucv_user_id, NULL, user_data,
826 iucv_path_free(iucv->path);
829 case 0x0b: /* Target communicator is not logged on */
832 case 0x0d: /* Max connections for this guest exceeded */
833 case 0x0e: /* Max connections for target guest exceeded */
836 case 0x0f: /* Missing IUCV authorization */
848 /* Connect an unconnected socket */
849 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
852 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
853 struct sock *sk = sock->sk;
854 struct iucv_sock *iucv = iucv_sk(sk);
857 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
860 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
863 if (sk->sk_state == IUCV_OPEN &&
864 iucv->transport == AF_IUCV_TRANS_HIPER)
865 return -EBADFD; /* explicit bind required */
867 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
870 if (sk->sk_state == IUCV_OPEN) {
871 err = iucv_sock_autobind(sk);
878 /* Set the destination information */
879 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
880 memcpy(iucv->dst_name, sa->siucv_name, 8);
882 if (iucv->transport == AF_IUCV_TRANS_HIPER)
883 err = afiucv_hs_connect(sock);
885 err = afiucv_path_connect(sock, addr);
889 if (sk->sk_state != IUCV_CONNECTED)
890 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
892 sock_sndtimeo(sk, flags & O_NONBLOCK));
894 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
897 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) {
898 pr_iucv->path_sever(iucv->path, NULL);
899 iucv_path_free(iucv->path);
908 /* Move a socket into listening state. */
909 static int iucv_sock_listen(struct socket *sock, int backlog)
911 struct sock *sk = sock->sk;
917 if (sk->sk_state != IUCV_BOUND)
920 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
923 sk->sk_max_ack_backlog = backlog;
924 sk->sk_ack_backlog = 0;
925 sk->sk_state = IUCV_LISTEN;
933 /* Accept a pending connection */
934 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
937 DECLARE_WAITQUEUE(wait, current);
938 struct sock *sk = sock->sk, *nsk;
942 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
944 if (sk->sk_state != IUCV_LISTEN) {
949 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
951 /* Wait for an incoming connection */
952 add_wait_queue_exclusive(sk_sleep(sk), &wait);
953 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
954 set_current_state(TASK_INTERRUPTIBLE);
961 timeo = schedule_timeout(timeo);
962 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
964 if (sk->sk_state != IUCV_LISTEN) {
969 if (signal_pending(current)) {
970 err = sock_intr_errno(timeo);
975 set_current_state(TASK_RUNNING);
976 remove_wait_queue(sk_sleep(sk), &wait);
981 newsock->state = SS_CONNECTED;
988 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
991 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
992 struct sock *sk = sock->sk;
993 struct iucv_sock *iucv = iucv_sk(sk);
995 addr->sa_family = AF_IUCV;
996 *len = sizeof(struct sockaddr_iucv);
999 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1000 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1002 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1003 memcpy(siucv->siucv_name, iucv->src_name, 8);
1005 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1006 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1007 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1013 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1015 * @msg: Pointer to a struct iucv_message
1016 * @skb: The socket data to send, skb->len MUST BE <= 7
1018 * Send the socket data in the parameter list in the iucv message
1019 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1020 * list and the socket data len at index 7 (last byte).
1021 * See also iucv_msg_length().
1023 * Returns the error code from the iucv_message_send() call.
1025 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1026 struct sk_buff *skb)
1030 memcpy(prmdata, (void *) skb->data, skb->len);
1031 prmdata[7] = 0xff - (u8) skb->len;
1032 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1033 (void *) prmdata, 8);
1036 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1037 struct msghdr *msg, size_t len)
1039 struct sock *sk = sock->sk;
1040 struct iucv_sock *iucv = iucv_sk(sk);
1041 struct sk_buff *skb;
1042 struct iucv_message txmsg;
1043 struct cmsghdr *cmsg;
1049 int noblock = msg->msg_flags & MSG_DONTWAIT;
1051 err = sock_error(sk);
1055 if (msg->msg_flags & MSG_OOB)
1058 /* SOCK_SEQPACKET: we do not support segmented records */
1059 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1064 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1069 /* Return if the socket is not in connected state */
1070 if (sk->sk_state != IUCV_CONNECTED) {
1075 /* initialize defaults */
1076 cmsg_done = 0; /* check for duplicate headers */
1079 /* iterate over control messages */
1080 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
1081 cmsg = CMSG_NXTHDR(msg, cmsg)) {
1083 if (!CMSG_OK(msg, cmsg)) {
1088 if (cmsg->cmsg_level != SOL_IUCV)
1091 if (cmsg->cmsg_type & cmsg_done) {
1095 cmsg_done |= cmsg->cmsg_type;
1097 switch (cmsg->cmsg_type) {
1098 case SCM_IUCV_TRGCLS:
1099 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1104 /* set iucv message target class */
1105 memcpy(&txmsg.class,
1106 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1117 /* allocate one skb for each iucv message:
1118 * this is fine for SOCK_SEQPACKET (unless we want to support
1119 * segmented records using the MSG_EOR flag), but
1120 * for SOCK_STREAM we might want to improve it in future */
1121 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1122 skb = sock_alloc_send_skb(sk,
1123 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1126 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1129 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1130 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1131 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1136 /* wait if outstanding messages for iucv path has reached */
1137 timeo = sock_sndtimeo(sk, noblock);
1138 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1142 /* return -ECONNRESET if the socket is no longer connected */
1143 if (sk->sk_state != IUCV_CONNECTED) {
1148 /* increment and save iucv message tag for msg_completion cbk */
1149 txmsg.tag = iucv->send_tag++;
1150 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
1151 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1152 atomic_inc(&iucv->msg_sent);
1153 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1155 atomic_dec(&iucv->msg_sent);
1160 skb_queue_tail(&iucv->send_skb_q, skb);
1162 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1164 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1166 /* on success: there is no message_complete callback
1167 * for an IPRMDATA msg; remove skb from send queue */
1169 skb_unlink(skb, &iucv->send_skb_q);
1173 /* this error should never happen since the
1174 * IUCV_IPRMDATA path flag is set... sever path */
1176 pr_iucv->path_sever(iucv->path, NULL);
1177 skb_unlink(skb, &iucv->send_skb_q);
1182 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1183 (void *) skb->data, skb->len);
1187 memcpy(user_id, iucv->dst_user_id, 8);
1189 memcpy(appl_id, iucv->dst_name, 8);
1190 pr_err("Application %s on z/VM guest %s"
1191 " exceeds message limit\n",
1196 skb_unlink(skb, &iucv->send_skb_q);
1213 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1215 * Locking: must be called with message_q.lock held
1217 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1219 int dataleft, size, copied = 0;
1220 struct sk_buff *nskb;
1224 if (dataleft >= sk->sk_rcvbuf / 4)
1225 size = sk->sk_rcvbuf / 4;
1229 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1233 /* copy target class to control buffer of new skb */
1234 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1236 /* copy data fragment */
1237 memcpy(nskb->data, skb->data + copied, size);
1241 skb_reset_transport_header(nskb);
1242 skb_reset_network_header(nskb);
1245 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1251 /* iucv_process_message() - Receive a single outstanding IUCV message
1253 * Locking: must be called with message_q.lock held
1255 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1256 struct iucv_path *path,
1257 struct iucv_message *msg)
1262 len = iucv_msg_length(msg);
1264 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1265 /* Note: the first 4 bytes are reserved for msg tag */
1266 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1268 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1269 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1270 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1275 rc = pr_iucv->message_receive(path, msg,
1276 msg->flags & IUCV_IPRMDATA,
1277 skb->data, len, NULL);
1282 /* we need to fragment iucv messages for SOCK_STREAM only;
1283 * for SOCK_SEQPACKET, it is only relevant if we support
1284 * record segmentation using MSG_EOR (see also recvmsg()) */
1285 if (sk->sk_type == SOCK_STREAM &&
1286 skb->truesize >= sk->sk_rcvbuf / 4) {
1287 rc = iucv_fragment_skb(sk, skb, len);
1291 pr_iucv->path_sever(path, NULL);
1294 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1296 skb_reset_transport_header(skb);
1297 skb_reset_network_header(skb);
1302 if (sock_queue_rcv_skb(sk, skb))
1303 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1306 /* iucv_process_message_q() - Process outstanding IUCV messages
1308 * Locking: must be called with message_q.lock held
1310 static void iucv_process_message_q(struct sock *sk)
1312 struct iucv_sock *iucv = iucv_sk(sk);
1313 struct sk_buff *skb;
1314 struct sock_msg_q *p, *n;
1316 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1317 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1320 iucv_process_message(sk, skb, p->path, &p->msg);
1323 if (!skb_queue_empty(&iucv->backlog_skb_q))
1328 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1329 struct msghdr *msg, size_t len, int flags)
1331 int noblock = flags & MSG_DONTWAIT;
1332 struct sock *sk = sock->sk;
1333 struct iucv_sock *iucv = iucv_sk(sk);
1334 unsigned int copied, rlen;
1335 struct sk_buff *skb, *rskb, *cskb, *sskb;
1339 if ((sk->sk_state == IUCV_DISCONN) &&
1340 skb_queue_empty(&iucv->backlog_skb_q) &&
1341 skb_queue_empty(&sk->sk_receive_queue) &&
1342 list_empty(&iucv->message_q.list))
1345 if (flags & (MSG_OOB))
1348 /* receive/dequeue next skb:
1349 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1350 skb = skb_recv_datagram(sk, flags, noblock, &err);
1352 if (sk->sk_shutdown & RCV_SHUTDOWN)
1357 rlen = skb->len; /* real length of skb */
1358 copied = min_t(unsigned int, rlen, len);
1361 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
1362 if (!(flags & MSG_PEEK))
1363 skb_queue_head(&sk->sk_receive_queue, skb);
1367 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1368 if (sk->sk_type == SOCK_SEQPACKET) {
1370 msg->msg_flags |= MSG_TRUNC;
1371 /* each iucv message contains a complete record */
1372 msg->msg_flags |= MSG_EOR;
1375 /* create control message to store iucv msg target class:
1376 * get the trgcls from the control buffer of the skb due to
1377 * fragmentation of original iucv message. */
1378 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1379 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1381 if (!(flags & MSG_PEEK))
1382 skb_queue_head(&sk->sk_receive_queue, skb);
1386 /* Mark read part of skb as used */
1387 if (!(flags & MSG_PEEK)) {
1389 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1390 if (sk->sk_type == SOCK_STREAM) {
1391 skb_pull(skb, copied);
1393 skb_queue_head(&sk->sk_receive_queue, skb);
1399 atomic_inc(&iucv->msg_recv);
1401 /* Queue backlog skbs */
1402 spin_lock_bh(&iucv->message_q.lock);
1403 rskb = skb_dequeue(&iucv->backlog_skb_q);
1405 if (sock_queue_rcv_skb(sk, rskb)) {
1406 skb_queue_head(&iucv->backlog_skb_q,
1410 rskb = skb_dequeue(&iucv->backlog_skb_q);
1413 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1414 if (!list_empty(&iucv->message_q.list))
1415 iucv_process_message_q(sk);
1416 if (atomic_read(&iucv->msg_recv) >=
1417 iucv->msglimit / 2) {
1418 /* send WIN to peer */
1419 blen = sizeof(struct af_iucv_trans_hdr) +
1421 sskb = sock_alloc_send_skb(sk, blen, 1, &err);
1423 skb_reserve(sskb, blen);
1424 err = afiucv_hs_send(NULL, sk, sskb,
1428 sk->sk_state = IUCV_DISCONN;
1429 sk->sk_state_change(sk);
1433 spin_unlock_bh(&iucv->message_q.lock);
1437 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1438 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1444 static inline unsigned int iucv_accept_poll(struct sock *parent)
1446 struct iucv_sock *isk, *n;
1449 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1450 sk = (struct sock *) isk;
1452 if (sk->sk_state == IUCV_CONNECTED)
1453 return POLLIN | POLLRDNORM;
1459 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1462 struct sock *sk = sock->sk;
1463 unsigned int mask = 0;
1465 sock_poll_wait(file, sk_sleep(sk), wait);
1467 if (sk->sk_state == IUCV_LISTEN)
1468 return iucv_accept_poll(sk);
1470 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1473 if (sk->sk_shutdown & RCV_SHUTDOWN)
1476 if (sk->sk_shutdown == SHUTDOWN_MASK)
1479 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1480 (sk->sk_shutdown & RCV_SHUTDOWN))
1481 mask |= POLLIN | POLLRDNORM;
1483 if (sk->sk_state == IUCV_CLOSED)
1486 if (sk->sk_state == IUCV_DISCONN)
1489 if (sock_writeable(sk))
1490 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1492 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1497 static int iucv_sock_shutdown(struct socket *sock, int how)
1499 struct sock *sk = sock->sk;
1500 struct iucv_sock *iucv = iucv_sk(sk);
1501 struct iucv_message txmsg;
1506 if ((how & ~SHUTDOWN_MASK) || !how)
1510 switch (sk->sk_state) {
1518 sk->sk_shutdown |= how;
1522 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1525 err = pr_iucv->message_send(iucv->path, &txmsg, IUCV_IPRMDATA,
1526 0, (void *) iprm_shutdown, 8);
1542 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1543 err = pr_iucv->path_quiesce(iucv->path, NULL);
1547 skb_queue_purge(&sk->sk_receive_queue);
1550 /* Wake up anyone sleeping in poll */
1551 sk->sk_state_change(sk);
1558 static int iucv_sock_release(struct socket *sock)
1560 struct sock *sk = sock->sk;
1566 iucv_sock_close(sk);
1568 /* Unregister with IUCV base support */
1569 if (iucv_sk(sk)->path) {
1570 pr_iucv->path_sever(iucv_sk(sk)->path, NULL);
1571 iucv_path_free(iucv_sk(sk)->path);
1572 iucv_sk(sk)->path = NULL;
1580 /* getsockopt and setsockopt */
1581 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1582 char __user *optval, unsigned int optlen)
1584 struct sock *sk = sock->sk;
1585 struct iucv_sock *iucv = iucv_sk(sk);
1589 if (level != SOL_IUCV)
1590 return -ENOPROTOOPT;
1592 if (optlen < sizeof(int))
1595 if (get_user(val, (int __user *) optval))
1602 case SO_IPRMDATA_MSG:
1604 iucv->flags |= IUCV_IPRMDATA;
1606 iucv->flags &= ~IUCV_IPRMDATA;
1609 switch (sk->sk_state) {
1612 if (val < 1 || val > (u16)(~0))
1615 iucv->msglimit = val;
1631 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1632 char __user *optval, int __user *optlen)
1634 struct sock *sk = sock->sk;
1635 struct iucv_sock *iucv = iucv_sk(sk);
1638 if (level != SOL_IUCV)
1639 return -ENOPROTOOPT;
1641 if (get_user(len, optlen))
1647 len = min_t(unsigned int, len, sizeof(int));
1650 case SO_IPRMDATA_MSG:
1651 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1655 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1656 : iucv->msglimit; /* default */
1660 return -ENOPROTOOPT;
1663 if (put_user(len, optlen))
1665 if (copy_to_user(optval, &val, len))
1672 /* Callback wrappers - called from iucv base support */
1673 static int iucv_callback_connreq(struct iucv_path *path,
1674 u8 ipvmid[8], u8 ipuser[16])
1676 unsigned char user_data[16];
1677 unsigned char nuser_data[16];
1678 unsigned char src_name[8];
1679 struct hlist_node *node;
1680 struct sock *sk, *nsk;
1681 struct iucv_sock *iucv, *niucv;
1684 memcpy(src_name, ipuser, 8);
1685 EBCASC(src_name, 8);
1686 /* Find out if this path belongs to af_iucv. */
1687 read_lock(&iucv_sk_list.lock);
1690 sk_for_each(sk, node, &iucv_sk_list.head)
1691 if (sk->sk_state == IUCV_LISTEN &&
1692 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1694 * Found a listening socket with
1695 * src_name == ipuser[0-7].
1700 read_unlock(&iucv_sk_list.lock);
1702 /* No socket found, not one of our paths. */
1707 /* Check if parent socket is listening */
1708 low_nmcpy(user_data, iucv->src_name);
1709 high_nmcpy(user_data, iucv->dst_name);
1710 ASCEBC(user_data, sizeof(user_data));
1711 if (sk->sk_state != IUCV_LISTEN) {
1712 err = pr_iucv->path_sever(path, user_data);
1713 iucv_path_free(path);
1717 /* Check for backlog size */
1718 if (sk_acceptq_is_full(sk)) {
1719 err = pr_iucv->path_sever(path, user_data);
1720 iucv_path_free(path);
1724 /* Create the new socket */
1725 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1727 err = pr_iucv->path_sever(path, user_data);
1728 iucv_path_free(path);
1732 niucv = iucv_sk(nsk);
1733 iucv_sock_init(nsk, sk);
1735 /* Set the new iucv_sock */
1736 memcpy(niucv->dst_name, ipuser + 8, 8);
1737 EBCASC(niucv->dst_name, 8);
1738 memcpy(niucv->dst_user_id, ipvmid, 8);
1739 memcpy(niucv->src_name, iucv->src_name, 8);
1740 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1743 /* Call iucv_accept */
1744 high_nmcpy(nuser_data, ipuser + 8);
1745 memcpy(nuser_data + 8, niucv->src_name, 8);
1746 ASCEBC(nuser_data + 8, 8);
1748 /* set message limit for path based on msglimit of accepting socket */
1749 niucv->msglimit = iucv->msglimit;
1750 path->msglim = iucv->msglimit;
1751 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1753 err = pr_iucv->path_sever(path, user_data);
1754 iucv_path_free(path);
1755 iucv_sock_kill(nsk);
1759 iucv_accept_enqueue(sk, nsk);
1761 /* Wake up accept */
1762 nsk->sk_state = IUCV_CONNECTED;
1763 sk->sk_data_ready(sk, 1);
1770 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1772 struct sock *sk = path->private;
1774 sk->sk_state = IUCV_CONNECTED;
1775 sk->sk_state_change(sk);
1778 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1780 struct sock *sk = path->private;
1781 struct iucv_sock *iucv = iucv_sk(sk);
1782 struct sk_buff *skb;
1783 struct sock_msg_q *save_msg;
1786 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1787 pr_iucv->message_reject(path, msg);
1791 spin_lock(&iucv->message_q.lock);
1793 if (!list_empty(&iucv->message_q.list) ||
1794 !skb_queue_empty(&iucv->backlog_skb_q))
1797 len = atomic_read(&sk->sk_rmem_alloc);
1798 len += SKB_TRUESIZE(iucv_msg_length(msg));
1799 if (len > sk->sk_rcvbuf)
1802 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1806 iucv_process_message(sk, skb, path, msg);
1810 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1813 save_msg->path = path;
1814 save_msg->msg = *msg;
1816 list_add_tail(&save_msg->list, &iucv->message_q.list);
1819 spin_unlock(&iucv->message_q.lock);
1822 static void iucv_callback_txdone(struct iucv_path *path,
1823 struct iucv_message *msg)
1825 struct sock *sk = path->private;
1826 struct sk_buff *this = NULL;
1827 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1828 struct sk_buff *list_skb = list->next;
1829 unsigned long flags;
1831 if (!skb_queue_empty(list)) {
1832 spin_lock_irqsave(&list->lock, flags);
1834 while (list_skb != (struct sk_buff *)list) {
1835 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1839 list_skb = list_skb->next;
1842 __skb_unlink(this, list);
1844 spin_unlock_irqrestore(&list->lock, flags);
1848 /* wake up any process waiting for sending */
1849 iucv_sock_wake_msglim(sk);
1854 if (sk->sk_state == IUCV_CLOSING) {
1855 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1856 sk->sk_state = IUCV_CLOSED;
1857 sk->sk_state_change(sk);
1863 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1865 struct sock *sk = path->private;
1867 sk->sk_state = IUCV_DISCONN;
1869 sk->sk_state_change(sk);
1872 /* called if the other communication side shuts down its RECV direction;
1873 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1875 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1877 struct sock *sk = path->private;
1880 if (sk->sk_state != IUCV_CLOSED) {
1881 sk->sk_shutdown |= SEND_SHUTDOWN;
1882 sk->sk_state_change(sk);
1887 /***************** HiperSockets transport callbacks ********************/
1888 static void afiucv_swap_src_dest(struct sk_buff *skb)
1890 struct af_iucv_trans_hdr *trans_hdr =
1891 (struct af_iucv_trans_hdr *)skb->data;
1895 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1896 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1897 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1898 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1899 memcpy(tmpID, trans_hdr->srcUserID, 8);
1900 memcpy(tmpName, trans_hdr->srcAppName, 8);
1901 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1902 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1903 memcpy(trans_hdr->destUserID, tmpID, 8);
1904 memcpy(trans_hdr->destAppName, tmpName, 8);
1905 skb_push(skb, ETH_HLEN);
1906 memset(skb->data, 0, ETH_HLEN);
1910 * afiucv_hs_callback_syn - react on received SYN
1912 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1915 struct iucv_sock *iucv, *niucv;
1916 struct af_iucv_trans_hdr *trans_hdr;
1920 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1922 /* no sock - connection refused */
1923 afiucv_swap_src_dest(skb);
1924 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1925 err = dev_queue_xmit(skb);
1929 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1931 if ((sk->sk_state != IUCV_LISTEN) ||
1932 sk_acceptq_is_full(sk) ||
1934 /* error on server socket - connection refused */
1937 afiucv_swap_src_dest(skb);
1938 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1939 err = dev_queue_xmit(skb);
1944 niucv = iucv_sk(nsk);
1945 iucv_sock_init(nsk, sk);
1946 niucv->transport = AF_IUCV_TRANS_HIPER;
1947 niucv->msglimit = iucv->msglimit;
1948 if (!trans_hdr->window)
1949 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1951 niucv->msglimit_peer = trans_hdr->window;
1952 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1953 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1954 memcpy(niucv->src_name, iucv->src_name, 8);
1955 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1956 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1957 afiucv_swap_src_dest(skb);
1958 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1959 trans_hdr->window = niucv->msglimit;
1960 /* if receiver acks the xmit connection is established */
1961 err = dev_queue_xmit(skb);
1963 iucv_accept_enqueue(sk, nsk);
1964 nsk->sk_state = IUCV_CONNECTED;
1965 sk->sk_data_ready(sk, 1);
1967 iucv_sock_kill(nsk);
1971 return NET_RX_SUCCESS;
1975 * afiucv_hs_callback_synack() - react on received SYN-ACK
1977 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1979 struct iucv_sock *iucv = iucv_sk(sk);
1980 struct af_iucv_trans_hdr *trans_hdr =
1981 (struct af_iucv_trans_hdr *)skb->data;
1985 if (sk->sk_state != IUCV_BOUND)
1988 iucv->msglimit_peer = trans_hdr->window;
1989 sk->sk_state = IUCV_CONNECTED;
1990 sk->sk_state_change(sk);
1994 return NET_RX_SUCCESS;
1998 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2000 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2002 struct iucv_sock *iucv = iucv_sk(sk);
2006 if (sk->sk_state != IUCV_BOUND)
2009 sk->sk_state = IUCV_DISCONN;
2010 sk->sk_state_change(sk);
2014 return NET_RX_SUCCESS;
2018 * afiucv_hs_callback_fin() - react on received FIN
2020 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2022 struct iucv_sock *iucv = iucv_sk(sk);
2024 /* other end of connection closed */
2027 sk->sk_state = IUCV_DISCONN;
2028 sk->sk_state_change(sk);
2032 return NET_RX_SUCCESS;
2036 * afiucv_hs_callback_win() - react on received WIN
2038 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2040 struct iucv_sock *iucv = iucv_sk(sk);
2041 struct af_iucv_trans_hdr *trans_hdr =
2042 (struct af_iucv_trans_hdr *)skb->data;
2045 return NET_RX_SUCCESS;
2047 if (sk->sk_state != IUCV_CONNECTED)
2048 return NET_RX_SUCCESS;
2050 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2051 iucv_sock_wake_msglim(sk);
2052 return NET_RX_SUCCESS;
2056 * afiucv_hs_callback_rx() - react on received data
2058 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2060 struct iucv_sock *iucv = iucv_sk(sk);
2064 return NET_RX_SUCCESS;
2067 if (sk->sk_state != IUCV_CONNECTED) {
2069 return NET_RX_SUCCESS;
2072 /* write stuff from iucv_msg to skb cb */
2073 if (skb->len <= sizeof(struct af_iucv_trans_hdr)) {
2075 return NET_RX_SUCCESS;
2077 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2078 skb_reset_transport_header(skb);
2079 skb_reset_network_header(skb);
2080 spin_lock(&iucv->message_q.lock);
2081 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2082 if (sock_queue_rcv_skb(sk, skb)) {
2083 /* handle rcv queue full */
2084 skb_queue_tail(&iucv->backlog_skb_q, skb);
2087 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2088 spin_unlock(&iucv->message_q.lock);
2089 return NET_RX_SUCCESS;
2093 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2095 * called from netif RX softirq
2097 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2098 struct packet_type *pt, struct net_device *orig_dev)
2100 struct hlist_node *node;
2102 struct iucv_sock *iucv;
2103 struct af_iucv_trans_hdr *trans_hdr;
2107 skb_pull(skb, ETH_HLEN);
2108 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2109 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2110 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2111 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2112 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2113 memset(nullstring, 0, sizeof(nullstring));
2116 read_lock(&iucv_sk_list.lock);
2117 sk_for_each(sk, node, &iucv_sk_list.head) {
2118 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2119 if ((!memcmp(&iucv_sk(sk)->src_name,
2120 trans_hdr->destAppName, 8)) &&
2121 (!memcmp(&iucv_sk(sk)->src_user_id,
2122 trans_hdr->destUserID, 8)) &&
2123 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2124 (!memcmp(&iucv_sk(sk)->dst_user_id,
2130 if ((!memcmp(&iucv_sk(sk)->src_name,
2131 trans_hdr->destAppName, 8)) &&
2132 (!memcmp(&iucv_sk(sk)->src_user_id,
2133 trans_hdr->destUserID, 8)) &&
2134 (!memcmp(&iucv_sk(sk)->dst_name,
2135 trans_hdr->srcAppName, 8)) &&
2136 (!memcmp(&iucv_sk(sk)->dst_user_id,
2137 trans_hdr->srcUserID, 8))) {
2143 read_unlock(&iucv_sk_list.lock);
2148 how should we send with no sock
2149 1) send without sock no send rc checking?
2150 2) introduce default sock to handle this cases
2152 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2154 SYN|ACK, SYN|FIN, FIN -> no action? */
2156 switch (trans_hdr->flags) {
2157 case AF_IUCV_FLAG_SYN:
2158 /* connect request */
2159 err = afiucv_hs_callback_syn(sk, skb);
2161 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2162 /* connect request confirmed */
2163 err = afiucv_hs_callback_synack(sk, skb);
2165 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2166 /* connect request refused */
2167 err = afiucv_hs_callback_synfin(sk, skb);
2169 case (AF_IUCV_FLAG_FIN):
2171 err = afiucv_hs_callback_fin(sk, skb);
2173 case (AF_IUCV_FLAG_WIN):
2174 err = afiucv_hs_callback_win(sk, skb);
2175 if (skb->len > sizeof(struct af_iucv_trans_hdr))
2176 err = afiucv_hs_callback_rx(sk, skb);
2181 /* plain data frame */
2182 memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class,
2184 err = afiucv_hs_callback_rx(sk, skb);
2194 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2197 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2198 enum iucv_tx_notify n)
2200 struct sock *isk = skb->sk;
2201 struct sock *sk = NULL;
2202 struct iucv_sock *iucv = NULL;
2203 struct sk_buff_head *list;
2204 struct sk_buff *list_skb;
2205 struct sk_buff *this = NULL;
2206 unsigned long flags;
2207 struct hlist_node *node;
2209 read_lock(&iucv_sk_list.lock);
2210 sk_for_each(sk, node, &iucv_sk_list.head)
2215 read_unlock(&iucv_sk_list.lock);
2221 list = &iucv->send_skb_q;
2222 list_skb = list->next;
2223 if (skb_queue_empty(list))
2226 spin_lock_irqsave(&list->lock, flags);
2227 while (list_skb != (struct sk_buff *)list) {
2228 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2232 __skb_unlink(this, list);
2233 iucv_sock_wake_msglim(sk);
2237 case TX_NOTIFY_PENDING:
2238 atomic_inc(&iucv->pendings);
2240 case TX_NOTIFY_DELAYED_OK:
2241 __skb_unlink(this, list);
2242 atomic_dec(&iucv->pendings);
2243 if (atomic_read(&iucv->pendings) <= 0)
2244 iucv_sock_wake_msglim(sk);
2248 case TX_NOTIFY_UNREACHABLE:
2249 case TX_NOTIFY_DELAYED_UNREACHABLE:
2250 case TX_NOTIFY_TPQFULL: /* not yet used */
2251 case TX_NOTIFY_GENERALERROR:
2252 case TX_NOTIFY_DELAYED_GENERALERROR:
2253 __skb_unlink(this, list);
2256 sk->sk_state = IUCV_DISCONN;
2257 sk->sk_state_change(sk);
2262 list_skb = list_skb->next;
2264 spin_unlock_irqrestore(&list->lock, flags);
2266 if (sk->sk_state == IUCV_CLOSING) {
2267 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2268 sk->sk_state = IUCV_CLOSED;
2269 sk->sk_state_change(sk);
2276 static const struct proto_ops iucv_sock_ops = {
2278 .owner = THIS_MODULE,
2279 .release = iucv_sock_release,
2280 .bind = iucv_sock_bind,
2281 .connect = iucv_sock_connect,
2282 .listen = iucv_sock_listen,
2283 .accept = iucv_sock_accept,
2284 .getname = iucv_sock_getname,
2285 .sendmsg = iucv_sock_sendmsg,
2286 .recvmsg = iucv_sock_recvmsg,
2287 .poll = iucv_sock_poll,
2288 .ioctl = sock_no_ioctl,
2289 .mmap = sock_no_mmap,
2290 .socketpair = sock_no_socketpair,
2291 .shutdown = iucv_sock_shutdown,
2292 .setsockopt = iucv_sock_setsockopt,
2293 .getsockopt = iucv_sock_getsockopt,
2296 static const struct net_proto_family iucv_sock_family_ops = {
2298 .owner = THIS_MODULE,
2299 .create = iucv_sock_create,
2302 static struct packet_type iucv_packet_type = {
2303 .type = cpu_to_be16(ETH_P_AF_IUCV),
2304 .func = afiucv_hs_rcv,
2307 static int afiucv_iucv_init(void)
2311 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2314 /* establish dummy device */
2315 af_iucv_driver.bus = pr_iucv->bus;
2316 err = driver_register(&af_iucv_driver);
2319 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2324 dev_set_name(af_iucv_dev, "af_iucv");
2325 af_iucv_dev->bus = pr_iucv->bus;
2326 af_iucv_dev->parent = pr_iucv->root;
2327 af_iucv_dev->release = (void (*)(struct device *))kfree;
2328 af_iucv_dev->driver = &af_iucv_driver;
2329 err = device_register(af_iucv_dev);
2335 driver_unregister(&af_iucv_driver);
2337 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2342 static int __init afiucv_init(void)
2346 if (MACHINE_IS_VM) {
2347 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2348 if (unlikely(err)) {
2350 err = -EPROTONOSUPPORT;
2354 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2356 printk(KERN_WARNING "iucv_if lookup failed\n");
2357 memset(&iucv_userid, 0, sizeof(iucv_userid));
2360 memset(&iucv_userid, 0, sizeof(iucv_userid));
2364 err = proto_register(&iucv_proto, 0);
2367 err = sock_register(&iucv_sock_family_ops);
2372 err = afiucv_iucv_init();
2376 dev_add_pack(&iucv_packet_type);
2380 sock_unregister(PF_IUCV);
2382 proto_unregister(&iucv_proto);
2385 symbol_put(iucv_if);
2389 static void __exit afiucv_exit(void)
2392 device_unregister(af_iucv_dev);
2393 driver_unregister(&af_iucv_driver);
2394 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2395 symbol_put(iucv_if);
2397 dev_remove_pack(&iucv_packet_type);
2398 sock_unregister(PF_IUCV);
2399 proto_unregister(&iucv_proto);
2402 module_init(afiucv_init);
2403 module_exit(afiucv_exit);
2405 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2406 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2407 MODULE_VERSION(VERSION);
2408 MODULE_LICENSE("GPL");
2409 MODULE_ALIAS_NETPROTO(PF_IUCV);