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 int afiucv_pm_prepare(struct device *dev)
135 #ifdef CONFIG_PM_DEBUG
136 printk(KERN_WARNING "afiucv_pm_prepare\n");
141 static void afiucv_pm_complete(struct device *dev)
143 #ifdef CONFIG_PM_DEBUG
144 printk(KERN_WARNING "afiucv_pm_complete\n");
149 * afiucv_pm_freeze() - Freeze PM callback
150 * @dev: AFIUCV dummy device
152 * Sever all established IUCV communication pathes
154 static int afiucv_pm_freeze(struct device *dev)
156 struct iucv_sock *iucv;
158 struct hlist_node *node;
161 #ifdef CONFIG_PM_DEBUG
162 printk(KERN_WARNING "afiucv_pm_freeze\n");
164 read_lock(&iucv_sk_list.lock);
165 sk_for_each(sk, node, &iucv_sk_list.head) {
167 skb_queue_purge(&iucv->send_skb_q);
168 skb_queue_purge(&iucv->backlog_skb_q);
169 switch (sk->sk_state) {
175 err = pr_iucv->path_sever(iucv->path, NULL);
176 iucv_path_free(iucv->path);
188 read_unlock(&iucv_sk_list.lock);
193 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
194 * @dev: AFIUCV dummy device
196 * socket clean up after freeze
198 static int afiucv_pm_restore_thaw(struct device *dev)
201 struct hlist_node *node;
203 #ifdef CONFIG_PM_DEBUG
204 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
206 read_lock(&iucv_sk_list.lock);
207 sk_for_each(sk, node, &iucv_sk_list.head) {
208 switch (sk->sk_state) {
211 sk->sk_state = IUCV_DISCONN;
212 sk->sk_state_change(sk);
224 read_unlock(&iucv_sk_list.lock);
228 static const struct dev_pm_ops afiucv_pm_ops = {
229 .prepare = afiucv_pm_prepare,
230 .complete = afiucv_pm_complete,
231 .freeze = afiucv_pm_freeze,
232 .thaw = afiucv_pm_restore_thaw,
233 .restore = afiucv_pm_restore_thaw,
236 static struct device_driver af_iucv_driver = {
237 .owner = THIS_MODULE,
240 .pm = &afiucv_pm_ops,
243 /* dummy device used as trigger for PM functions */
244 static struct device *af_iucv_dev;
247 * iucv_msg_length() - Returns the length of an iucv message.
248 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
250 * The function returns the length of the specified iucv message @msg of data
251 * stored in a buffer and of data stored in the parameter list (PRMDATA).
253 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
255 * PRMDATA[0..6] socket data (max 7 bytes);
256 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
258 * The socket data length is computed by subtracting the socket data length
260 * If the socket data len is greater 7, then PRMDATA can be used for special
261 * notifications (see iucv_sock_shutdown); and further,
262 * if the socket data len is > 7, the function returns 8.
264 * Use this function to allocate socket buffers to store iucv message data.
266 static inline size_t iucv_msg_length(struct iucv_message *msg)
270 if (msg->flags & IUCV_IPRMDATA) {
271 datalen = 0xff - msg->rmmsg[7];
272 return (datalen < 8) ? datalen : 8;
278 * iucv_sock_in_state() - check for specific states
279 * @sk: sock structure
280 * @state: first iucv sk state
281 * @state: second iucv sk state
283 * Returns true if the socket in either in the first or second state.
285 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
287 return (sk->sk_state == state || sk->sk_state == state2);
291 * iucv_below_msglim() - function to check if messages can be sent
292 * @sk: sock structure
294 * Returns true if the send queue length is lower than the message limit.
295 * Always returns true if the socket is not connected (no iucv path for
296 * checking the message limit).
298 static inline int iucv_below_msglim(struct sock *sk)
300 struct iucv_sock *iucv = iucv_sk(sk);
302 if (sk->sk_state != IUCV_CONNECTED)
304 if (iucv->transport == AF_IUCV_TRANS_IUCV)
305 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
307 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
308 (atomic_read(&iucv->pendings) <= 0));
312 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
314 static void iucv_sock_wake_msglim(struct sock *sk)
316 struct socket_wq *wq;
319 wq = rcu_dereference(sk->sk_wq);
320 if (wq_has_sleeper(wq))
321 wake_up_interruptible_all(&wq->wait);
322 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
327 * afiucv_hs_send() - send a message through HiperSockets transport
329 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
330 struct sk_buff *skb, u8 flags)
332 struct net *net = sock_net(sock);
333 struct iucv_sock *iucv = iucv_sk(sock);
334 struct af_iucv_trans_hdr *phs_hdr;
335 struct sk_buff *nskb;
336 int err, confirm_recv = 0;
338 memset(skb->head, 0, ETH_HLEN);
339 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
340 sizeof(struct af_iucv_trans_hdr));
341 skb_reset_mac_header(skb);
342 skb_reset_network_header(skb);
343 skb_push(skb, ETH_HLEN);
344 skb_reset_mac_header(skb);
345 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
347 phs_hdr->magic = ETH_P_AF_IUCV;
348 phs_hdr->version = 1;
349 phs_hdr->flags = flags;
350 if (flags == AF_IUCV_FLAG_SYN)
351 phs_hdr->window = iucv->msglimit;
352 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
353 confirm_recv = atomic_read(&iucv->msg_recv);
354 phs_hdr->window = confirm_recv;
356 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
358 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
359 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
360 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
361 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
362 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
363 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
364 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
365 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
367 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
370 skb->dev = dev_get_by_index_rcu(net, sock->sk_bound_dev_if);
374 if (!(skb->dev->flags & IFF_UP))
376 if (skb->len > skb->dev->mtu) {
377 if (sock->sk_type == SOCK_SEQPACKET)
380 skb_trim(skb, skb->dev->mtu);
382 skb->protocol = ETH_P_AF_IUCV;
383 nskb = skb_clone(skb, GFP_ATOMIC);
386 skb_queue_tail(&iucv->send_skb_q, nskb);
387 err = dev_queue_xmit(skb);
389 skb_unlink(nskb, &iucv->send_skb_q);
392 atomic_sub(confirm_recv, &iucv->msg_recv);
393 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
399 static void iucv_sock_timeout(unsigned long arg)
401 struct sock *sk = (struct sock *)arg;
404 sk->sk_err = ETIMEDOUT;
405 sk->sk_state_change(sk);
412 static void iucv_sock_clear_timer(struct sock *sk)
414 sk_stop_timer(sk, &sk->sk_timer);
417 static struct sock *__iucv_get_sock_by_name(char *nm)
420 struct hlist_node *node;
422 sk_for_each(sk, node, &iucv_sk_list.head)
423 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
429 static void iucv_sock_destruct(struct sock *sk)
431 skb_queue_purge(&sk->sk_receive_queue);
432 skb_queue_purge(&sk->sk_write_queue);
436 static void iucv_sock_cleanup_listen(struct sock *parent)
440 /* Close non-accepted connections */
441 while ((sk = iucv_accept_dequeue(parent, NULL))) {
446 parent->sk_state = IUCV_CLOSED;
449 /* Kill socket (only if zapped and orphaned) */
450 static void iucv_sock_kill(struct sock *sk)
452 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
455 iucv_sock_unlink(&iucv_sk_list, sk);
456 sock_set_flag(sk, SOCK_DEAD);
460 /* Close an IUCV socket */
461 static void iucv_sock_close(struct sock *sk)
463 unsigned char user_data[16];
464 struct iucv_sock *iucv = iucv_sk(sk);
469 iucv_sock_clear_timer(sk);
472 switch (sk->sk_state) {
474 iucv_sock_cleanup_listen(sk);
478 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
480 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
481 skb = sock_alloc_send_skb(sk, blen, 1, &err);
484 sizeof(struct af_iucv_trans_hdr) +
486 err = afiucv_hs_send(NULL, sk, skb,
489 sk->sk_state = IUCV_DISCONN;
490 sk->sk_state_change(sk);
493 sk->sk_state = IUCV_CLOSING;
494 sk->sk_state_change(sk);
496 if (!skb_queue_empty(&iucv->send_skb_q)) {
497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
498 timeo = sk->sk_lingertime;
500 timeo = IUCV_DISCONN_TIMEOUT;
502 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
506 case IUCV_CLOSING: /* fall through */
507 sk->sk_state = IUCV_CLOSED;
508 sk->sk_state_change(sk);
511 low_nmcpy(user_data, iucv->src_name);
512 high_nmcpy(user_data, iucv->dst_name);
513 ASCEBC(user_data, sizeof(user_data));
514 pr_iucv->path_sever(iucv->path, user_data);
515 iucv_path_free(iucv->path);
519 sk->sk_err = ECONNRESET;
520 sk->sk_state_change(sk);
522 skb_queue_purge(&iucv->send_skb_q);
523 skb_queue_purge(&iucv->backlog_skb_q);
527 /* nothing to do here */
531 /* mark socket for deletion by iucv_sock_kill() */
532 sock_set_flag(sk, SOCK_ZAPPED);
537 static void iucv_sock_init(struct sock *sk, struct sock *parent)
540 sk->sk_type = parent->sk_type;
543 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
546 struct iucv_sock *iucv;
548 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
553 sock_init_data(sock, sk);
554 INIT_LIST_HEAD(&iucv->accept_q);
555 spin_lock_init(&iucv->accept_q_lock);
556 skb_queue_head_init(&iucv->send_skb_q);
557 INIT_LIST_HEAD(&iucv->message_q.list);
558 spin_lock_init(&iucv->message_q.lock);
559 skb_queue_head_init(&iucv->backlog_skb_q);
561 atomic_set(&iucv->pendings, 0);
564 atomic_set(&iucv->msg_sent, 0);
565 atomic_set(&iucv->msg_recv, 0);
567 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
568 memset(&iucv->src_user_id , 0, 32);
570 iucv->transport = AF_IUCV_TRANS_IUCV;
572 iucv->transport = AF_IUCV_TRANS_HIPER;
574 sk->sk_destruct = iucv_sock_destruct;
575 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
576 sk->sk_allocation = GFP_DMA;
578 sock_reset_flag(sk, SOCK_ZAPPED);
580 sk->sk_protocol = proto;
581 sk->sk_state = IUCV_OPEN;
583 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
585 iucv_sock_link(&iucv_sk_list, sk);
589 /* Create an IUCV socket */
590 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
595 if (protocol && protocol != PF_IUCV)
596 return -EPROTONOSUPPORT;
598 sock->state = SS_UNCONNECTED;
600 switch (sock->type) {
602 sock->ops = &iucv_sock_ops;
605 /* currently, proto ops can handle both sk types */
606 sock->ops = &iucv_sock_ops;
609 return -ESOCKTNOSUPPORT;
612 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
616 iucv_sock_init(sk, NULL);
621 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
623 write_lock_bh(&l->lock);
624 sk_add_node(sk, &l->head);
625 write_unlock_bh(&l->lock);
628 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
630 write_lock_bh(&l->lock);
631 sk_del_node_init(sk);
632 write_unlock_bh(&l->lock);
635 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
638 struct iucv_sock *par = iucv_sk(parent);
641 spin_lock_irqsave(&par->accept_q_lock, flags);
642 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
643 spin_unlock_irqrestore(&par->accept_q_lock, flags);
644 iucv_sk(sk)->parent = parent;
645 sk_acceptq_added(parent);
648 void iucv_accept_unlink(struct sock *sk)
651 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
653 spin_lock_irqsave(&par->accept_q_lock, flags);
654 list_del_init(&iucv_sk(sk)->accept_q);
655 spin_unlock_irqrestore(&par->accept_q_lock, flags);
656 sk_acceptq_removed(iucv_sk(sk)->parent);
657 iucv_sk(sk)->parent = NULL;
661 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
663 struct iucv_sock *isk, *n;
666 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
667 sk = (struct sock *) isk;
670 if (sk->sk_state == IUCV_CLOSED) {
671 iucv_accept_unlink(sk);
676 if (sk->sk_state == IUCV_CONNECTED ||
677 sk->sk_state == IUCV_SEVERED ||
678 sk->sk_state == IUCV_DISCONN || /* due to PM restore */
680 iucv_accept_unlink(sk);
682 sock_graft(sk, newsock);
684 if (sk->sk_state == IUCV_SEVERED)
685 sk->sk_state = IUCV_DISCONN;
696 /* Bind an unbound socket */
697 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
700 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
701 struct sock *sk = sock->sk;
702 struct iucv_sock *iucv;
704 struct net_device *dev;
707 /* Verify the input sockaddr */
708 if (!addr || addr->sa_family != AF_IUCV)
712 if (sk->sk_state != IUCV_OPEN) {
717 write_lock_bh(&iucv_sk_list.lock);
720 if (__iucv_get_sock_by_name(sa->siucv_name)) {
727 /* Bind the socket */
730 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
731 goto vm_bind; /* VM IUCV transport */
733 /* try hiper transport */
734 memcpy(uid, sa->siucv_user_id, sizeof(uid));
737 for_each_netdev_rcu(&init_net, dev) {
738 if (!memcmp(dev->perm_addr, uid, 8)) {
739 memcpy(iucv->src_name, sa->siucv_name, 8);
740 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
741 sock->sk->sk_bound_dev_if = dev->ifindex;
742 sk->sk_state = IUCV_BOUND;
743 iucv->transport = AF_IUCV_TRANS_HIPER;
745 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
753 /* use local userid for backward compat */
754 memcpy(iucv->src_name, sa->siucv_name, 8);
755 memcpy(iucv->src_user_id, iucv_userid, 8);
756 sk->sk_state = IUCV_BOUND;
757 iucv->transport = AF_IUCV_TRANS_IUCV;
759 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
762 /* found no dev to bind */
765 /* Release the socket list lock */
766 write_unlock_bh(&iucv_sk_list.lock);
772 /* Automatically bind an unbound socket */
773 static int iucv_sock_autobind(struct sock *sk)
775 struct iucv_sock *iucv = iucv_sk(sk);
776 char query_buffer[80];
780 /* Set the userid and name */
781 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
785 memcpy(iucv->src_user_id, query_buffer, 8);
787 write_lock_bh(&iucv_sk_list.lock);
789 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
790 while (__iucv_get_sock_by_name(name)) {
791 sprintf(name, "%08x",
792 atomic_inc_return(&iucv_sk_list.autobind_name));
795 write_unlock_bh(&iucv_sk_list.lock);
797 memcpy(&iucv->src_name, name, 8);
800 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
805 static int afiucv_hs_connect(struct socket *sock)
807 struct sock *sk = sock->sk;
809 int blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
813 skb = sock_alloc_send_skb(sk, blen, 1, &err);
819 skb_reserve(skb, blen);
820 err = afiucv_hs_send(NULL, sk, skb, AF_IUCV_FLAG_SYN);
825 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
827 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
828 struct sock *sk = sock->sk;
829 struct iucv_sock *iucv = iucv_sk(sk);
830 unsigned char user_data[16];
833 high_nmcpy(user_data, sa->siucv_name);
834 low_nmcpy(user_data, iucv->src_name);
835 ASCEBC(user_data, sizeof(user_data));
838 iucv->path = iucv_path_alloc(iucv->msglimit,
839 IUCV_IPRMDATA, GFP_KERNEL);
844 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
845 sa->siucv_user_id, NULL, user_data,
848 iucv_path_free(iucv->path);
851 case 0x0b: /* Target communicator is not logged on */
854 case 0x0d: /* Max connections for this guest exceeded */
855 case 0x0e: /* Max connections for target guest exceeded */
858 case 0x0f: /* Missing IUCV authorization */
870 /* Connect an unconnected socket */
871 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
874 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
875 struct sock *sk = sock->sk;
876 struct iucv_sock *iucv = iucv_sk(sk);
879 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
882 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
885 if (sk->sk_state == IUCV_OPEN &&
886 iucv->transport == AF_IUCV_TRANS_HIPER)
887 return -EBADFD; /* explicit bind required */
889 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
892 if (sk->sk_state == IUCV_OPEN) {
893 err = iucv_sock_autobind(sk);
900 /* Set the destination information */
901 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
902 memcpy(iucv->dst_name, sa->siucv_name, 8);
904 if (iucv->transport == AF_IUCV_TRANS_HIPER)
905 err = afiucv_hs_connect(sock);
907 err = afiucv_path_connect(sock, addr);
911 if (sk->sk_state != IUCV_CONNECTED)
912 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
914 sock_sndtimeo(sk, flags & O_NONBLOCK));
916 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
919 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) {
920 pr_iucv->path_sever(iucv->path, NULL);
921 iucv_path_free(iucv->path);
930 /* Move a socket into listening state. */
931 static int iucv_sock_listen(struct socket *sock, int backlog)
933 struct sock *sk = sock->sk;
939 if (sk->sk_state != IUCV_BOUND)
942 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
945 sk->sk_max_ack_backlog = backlog;
946 sk->sk_ack_backlog = 0;
947 sk->sk_state = IUCV_LISTEN;
955 /* Accept a pending connection */
956 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
959 DECLARE_WAITQUEUE(wait, current);
960 struct sock *sk = sock->sk, *nsk;
964 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
966 if (sk->sk_state != IUCV_LISTEN) {
971 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
973 /* Wait for an incoming connection */
974 add_wait_queue_exclusive(sk_sleep(sk), &wait);
975 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
976 set_current_state(TASK_INTERRUPTIBLE);
983 timeo = schedule_timeout(timeo);
984 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
986 if (sk->sk_state != IUCV_LISTEN) {
991 if (signal_pending(current)) {
992 err = sock_intr_errno(timeo);
997 set_current_state(TASK_RUNNING);
998 remove_wait_queue(sk_sleep(sk), &wait);
1003 newsock->state = SS_CONNECTED;
1010 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
1013 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
1014 struct sock *sk = sock->sk;
1015 struct iucv_sock *iucv = iucv_sk(sk);
1017 addr->sa_family = AF_IUCV;
1018 *len = sizeof(struct sockaddr_iucv);
1021 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1022 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1024 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1025 memcpy(siucv->siucv_name, iucv->src_name, 8);
1027 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1028 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1029 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1035 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1037 * @msg: Pointer to a struct iucv_message
1038 * @skb: The socket data to send, skb->len MUST BE <= 7
1040 * Send the socket data in the parameter list in the iucv message
1041 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1042 * list and the socket data len at index 7 (last byte).
1043 * See also iucv_msg_length().
1045 * Returns the error code from the iucv_message_send() call.
1047 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1048 struct sk_buff *skb)
1052 memcpy(prmdata, (void *) skb->data, skb->len);
1053 prmdata[7] = 0xff - (u8) skb->len;
1054 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1055 (void *) prmdata, 8);
1058 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1059 struct msghdr *msg, size_t len)
1061 struct sock *sk = sock->sk;
1062 struct iucv_sock *iucv = iucv_sk(sk);
1063 struct sk_buff *skb;
1064 struct iucv_message txmsg;
1065 struct cmsghdr *cmsg;
1071 int noblock = msg->msg_flags & MSG_DONTWAIT;
1073 err = sock_error(sk);
1077 if (msg->msg_flags & MSG_OOB)
1080 /* SOCK_SEQPACKET: we do not support segmented records */
1081 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1086 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1091 /* Return if the socket is not in connected state */
1092 if (sk->sk_state != IUCV_CONNECTED) {
1097 /* initialize defaults */
1098 cmsg_done = 0; /* check for duplicate headers */
1101 /* iterate over control messages */
1102 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
1103 cmsg = CMSG_NXTHDR(msg, cmsg)) {
1105 if (!CMSG_OK(msg, cmsg)) {
1110 if (cmsg->cmsg_level != SOL_IUCV)
1113 if (cmsg->cmsg_type & cmsg_done) {
1117 cmsg_done |= cmsg->cmsg_type;
1119 switch (cmsg->cmsg_type) {
1120 case SCM_IUCV_TRGCLS:
1121 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1126 /* set iucv message target class */
1127 memcpy(&txmsg.class,
1128 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1139 /* allocate one skb for each iucv message:
1140 * this is fine for SOCK_SEQPACKET (unless we want to support
1141 * segmented records using the MSG_EOR flag), but
1142 * for SOCK_STREAM we might want to improve it in future */
1143 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1144 skb = sock_alloc_send_skb(sk,
1145 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1148 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1151 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1152 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1153 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1158 /* wait if outstanding messages for iucv path has reached */
1159 timeo = sock_sndtimeo(sk, noblock);
1160 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1164 /* return -ECONNRESET if the socket is no longer connected */
1165 if (sk->sk_state != IUCV_CONNECTED) {
1170 /* increment and save iucv message tag for msg_completion cbk */
1171 txmsg.tag = iucv->send_tag++;
1172 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
1173 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1174 atomic_inc(&iucv->msg_sent);
1175 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1177 atomic_dec(&iucv->msg_sent);
1182 skb_queue_tail(&iucv->send_skb_q, skb);
1184 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1186 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1188 /* on success: there is no message_complete callback
1189 * for an IPRMDATA msg; remove skb from send queue */
1191 skb_unlink(skb, &iucv->send_skb_q);
1195 /* this error should never happen since the
1196 * IUCV_IPRMDATA path flag is set... sever path */
1198 pr_iucv->path_sever(iucv->path, NULL);
1199 skb_unlink(skb, &iucv->send_skb_q);
1204 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1205 (void *) skb->data, skb->len);
1209 memcpy(user_id, iucv->dst_user_id, 8);
1211 memcpy(appl_id, iucv->dst_name, 8);
1212 pr_err("Application %s on z/VM guest %s"
1213 " exceeds message limit\n",
1218 skb_unlink(skb, &iucv->send_skb_q);
1233 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1235 * Locking: must be called with message_q.lock held
1237 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1239 int dataleft, size, copied = 0;
1240 struct sk_buff *nskb;
1244 if (dataleft >= sk->sk_rcvbuf / 4)
1245 size = sk->sk_rcvbuf / 4;
1249 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1253 /* copy target class to control buffer of new skb */
1254 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1256 /* copy data fragment */
1257 memcpy(nskb->data, skb->data + copied, size);
1261 skb_reset_transport_header(nskb);
1262 skb_reset_network_header(nskb);
1265 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1271 /* iucv_process_message() - Receive a single outstanding IUCV message
1273 * Locking: must be called with message_q.lock held
1275 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1276 struct iucv_path *path,
1277 struct iucv_message *msg)
1282 len = iucv_msg_length(msg);
1284 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1285 /* Note: the first 4 bytes are reserved for msg tag */
1286 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1288 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1289 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1290 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1295 rc = pr_iucv->message_receive(path, msg,
1296 msg->flags & IUCV_IPRMDATA,
1297 skb->data, len, NULL);
1302 /* we need to fragment iucv messages for SOCK_STREAM only;
1303 * for SOCK_SEQPACKET, it is only relevant if we support
1304 * record segmentation using MSG_EOR (see also recvmsg()) */
1305 if (sk->sk_type == SOCK_STREAM &&
1306 skb->truesize >= sk->sk_rcvbuf / 4) {
1307 rc = iucv_fragment_skb(sk, skb, len);
1311 pr_iucv->path_sever(path, NULL);
1314 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1316 skb_reset_transport_header(skb);
1317 skb_reset_network_header(skb);
1322 if (sock_queue_rcv_skb(sk, skb))
1323 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1326 /* iucv_process_message_q() - Process outstanding IUCV messages
1328 * Locking: must be called with message_q.lock held
1330 static void iucv_process_message_q(struct sock *sk)
1332 struct iucv_sock *iucv = iucv_sk(sk);
1333 struct sk_buff *skb;
1334 struct sock_msg_q *p, *n;
1336 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1337 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1340 iucv_process_message(sk, skb, p->path, &p->msg);
1343 if (!skb_queue_empty(&iucv->backlog_skb_q))
1348 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1349 struct msghdr *msg, size_t len, int flags)
1351 int noblock = flags & MSG_DONTWAIT;
1352 struct sock *sk = sock->sk;
1353 struct iucv_sock *iucv = iucv_sk(sk);
1354 unsigned int copied, rlen;
1355 struct sk_buff *skb, *rskb, *cskb, *sskb;
1359 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
1360 skb_queue_empty(&iucv->backlog_skb_q) &&
1361 skb_queue_empty(&sk->sk_receive_queue) &&
1362 list_empty(&iucv->message_q.list))
1365 if (flags & (MSG_OOB))
1368 /* receive/dequeue next skb:
1369 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1370 skb = skb_recv_datagram(sk, flags, noblock, &err);
1372 if (sk->sk_shutdown & RCV_SHUTDOWN)
1377 rlen = skb->len; /* real length of skb */
1378 copied = min_t(unsigned int, rlen, len);
1381 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
1382 if (!(flags & MSG_PEEK))
1383 skb_queue_head(&sk->sk_receive_queue, skb);
1387 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1388 if (sk->sk_type == SOCK_SEQPACKET) {
1390 msg->msg_flags |= MSG_TRUNC;
1391 /* each iucv message contains a complete record */
1392 msg->msg_flags |= MSG_EOR;
1395 /* create control message to store iucv msg target class:
1396 * get the trgcls from the control buffer of the skb due to
1397 * fragmentation of original iucv message. */
1398 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1399 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1401 if (!(flags & MSG_PEEK))
1402 skb_queue_head(&sk->sk_receive_queue, skb);
1406 /* Mark read part of skb as used */
1407 if (!(flags & MSG_PEEK)) {
1409 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1410 if (sk->sk_type == SOCK_STREAM) {
1411 skb_pull(skb, copied);
1413 skb_queue_head(&sk->sk_receive_queue, skb);
1419 atomic_inc(&iucv->msg_recv);
1421 /* Queue backlog skbs */
1422 spin_lock_bh(&iucv->message_q.lock);
1423 rskb = skb_dequeue(&iucv->backlog_skb_q);
1425 if (sock_queue_rcv_skb(sk, rskb)) {
1426 skb_queue_head(&iucv->backlog_skb_q,
1430 rskb = skb_dequeue(&iucv->backlog_skb_q);
1433 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1434 if (!list_empty(&iucv->message_q.list))
1435 iucv_process_message_q(sk);
1436 if (atomic_read(&iucv->msg_recv) >=
1437 iucv->msglimit / 2) {
1438 /* send WIN to peer */
1439 blen = sizeof(struct af_iucv_trans_hdr) +
1441 sskb = sock_alloc_send_skb(sk, blen, 1, &err);
1444 sizeof(struct af_iucv_trans_hdr)
1446 err = afiucv_hs_send(NULL, sk, sskb,
1450 sk->sk_state = IUCV_DISCONN;
1451 sk->sk_state_change(sk);
1455 spin_unlock_bh(&iucv->message_q.lock);
1459 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1460 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1466 static inline unsigned int iucv_accept_poll(struct sock *parent)
1468 struct iucv_sock *isk, *n;
1471 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1472 sk = (struct sock *) isk;
1474 if (sk->sk_state == IUCV_CONNECTED)
1475 return POLLIN | POLLRDNORM;
1481 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1484 struct sock *sk = sock->sk;
1485 unsigned int mask = 0;
1487 sock_poll_wait(file, sk_sleep(sk), wait);
1489 if (sk->sk_state == IUCV_LISTEN)
1490 return iucv_accept_poll(sk);
1492 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1495 if (sk->sk_shutdown & RCV_SHUTDOWN)
1498 if (sk->sk_shutdown == SHUTDOWN_MASK)
1501 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1502 (sk->sk_shutdown & RCV_SHUTDOWN))
1503 mask |= POLLIN | POLLRDNORM;
1505 if (sk->sk_state == IUCV_CLOSED)
1508 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
1511 if (sock_writeable(sk))
1512 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1514 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1519 static int iucv_sock_shutdown(struct socket *sock, int how)
1521 struct sock *sk = sock->sk;
1522 struct iucv_sock *iucv = iucv_sk(sk);
1523 struct iucv_message txmsg;
1528 if ((how & ~SHUTDOWN_MASK) || !how)
1532 switch (sk->sk_state) {
1541 sk->sk_shutdown |= how;
1545 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1548 err = pr_iucv->message_send(iucv->path, &txmsg, IUCV_IPRMDATA,
1549 0, (void *) iprm_shutdown, 8);
1565 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1566 err = pr_iucv->path_quiesce(iucv->path, NULL);
1570 skb_queue_purge(&sk->sk_receive_queue);
1573 /* Wake up anyone sleeping in poll */
1574 sk->sk_state_change(sk);
1581 static int iucv_sock_release(struct socket *sock)
1583 struct sock *sk = sock->sk;
1589 iucv_sock_close(sk);
1591 /* Unregister with IUCV base support */
1592 if (iucv_sk(sk)->path) {
1593 pr_iucv->path_sever(iucv_sk(sk)->path, NULL);
1594 iucv_path_free(iucv_sk(sk)->path);
1595 iucv_sk(sk)->path = NULL;
1603 /* getsockopt and setsockopt */
1604 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1605 char __user *optval, unsigned int optlen)
1607 struct sock *sk = sock->sk;
1608 struct iucv_sock *iucv = iucv_sk(sk);
1612 if (level != SOL_IUCV)
1613 return -ENOPROTOOPT;
1615 if (optlen < sizeof(int))
1618 if (get_user(val, (int __user *) optval))
1625 case SO_IPRMDATA_MSG:
1627 iucv->flags |= IUCV_IPRMDATA;
1629 iucv->flags &= ~IUCV_IPRMDATA;
1632 switch (sk->sk_state) {
1635 if (val < 1 || val > (u16)(~0))
1638 iucv->msglimit = val;
1654 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1655 char __user *optval, int __user *optlen)
1657 struct sock *sk = sock->sk;
1658 struct iucv_sock *iucv = iucv_sk(sk);
1661 if (level != SOL_IUCV)
1662 return -ENOPROTOOPT;
1664 if (get_user(len, optlen))
1670 len = min_t(unsigned int, len, sizeof(int));
1673 case SO_IPRMDATA_MSG:
1674 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1678 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1679 : iucv->msglimit; /* default */
1683 return -ENOPROTOOPT;
1686 if (put_user(len, optlen))
1688 if (copy_to_user(optval, &val, len))
1695 /* Callback wrappers - called from iucv base support */
1696 static int iucv_callback_connreq(struct iucv_path *path,
1697 u8 ipvmid[8], u8 ipuser[16])
1699 unsigned char user_data[16];
1700 unsigned char nuser_data[16];
1701 unsigned char src_name[8];
1702 struct hlist_node *node;
1703 struct sock *sk, *nsk;
1704 struct iucv_sock *iucv, *niucv;
1707 memcpy(src_name, ipuser, 8);
1708 EBCASC(src_name, 8);
1709 /* Find out if this path belongs to af_iucv. */
1710 read_lock(&iucv_sk_list.lock);
1713 sk_for_each(sk, node, &iucv_sk_list.head)
1714 if (sk->sk_state == IUCV_LISTEN &&
1715 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1717 * Found a listening socket with
1718 * src_name == ipuser[0-7].
1723 read_unlock(&iucv_sk_list.lock);
1725 /* No socket found, not one of our paths. */
1730 /* Check if parent socket is listening */
1731 low_nmcpy(user_data, iucv->src_name);
1732 high_nmcpy(user_data, iucv->dst_name);
1733 ASCEBC(user_data, sizeof(user_data));
1734 if (sk->sk_state != IUCV_LISTEN) {
1735 err = pr_iucv->path_sever(path, user_data);
1736 iucv_path_free(path);
1740 /* Check for backlog size */
1741 if (sk_acceptq_is_full(sk)) {
1742 err = pr_iucv->path_sever(path, user_data);
1743 iucv_path_free(path);
1747 /* Create the new socket */
1748 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1750 err = pr_iucv->path_sever(path, user_data);
1751 iucv_path_free(path);
1755 niucv = iucv_sk(nsk);
1756 iucv_sock_init(nsk, sk);
1758 /* Set the new iucv_sock */
1759 memcpy(niucv->dst_name, ipuser + 8, 8);
1760 EBCASC(niucv->dst_name, 8);
1761 memcpy(niucv->dst_user_id, ipvmid, 8);
1762 memcpy(niucv->src_name, iucv->src_name, 8);
1763 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1766 /* Call iucv_accept */
1767 high_nmcpy(nuser_data, ipuser + 8);
1768 memcpy(nuser_data + 8, niucv->src_name, 8);
1769 ASCEBC(nuser_data + 8, 8);
1771 /* set message limit for path based on msglimit of accepting socket */
1772 niucv->msglimit = iucv->msglimit;
1773 path->msglim = iucv->msglimit;
1774 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1776 err = pr_iucv->path_sever(path, user_data);
1777 iucv_path_free(path);
1778 iucv_sock_kill(nsk);
1782 iucv_accept_enqueue(sk, nsk);
1784 /* Wake up accept */
1785 nsk->sk_state = IUCV_CONNECTED;
1786 sk->sk_data_ready(sk, 1);
1793 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1795 struct sock *sk = path->private;
1797 sk->sk_state = IUCV_CONNECTED;
1798 sk->sk_state_change(sk);
1801 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1803 struct sock *sk = path->private;
1804 struct iucv_sock *iucv = iucv_sk(sk);
1805 struct sk_buff *skb;
1806 struct sock_msg_q *save_msg;
1809 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1810 pr_iucv->message_reject(path, msg);
1814 spin_lock(&iucv->message_q.lock);
1816 if (!list_empty(&iucv->message_q.list) ||
1817 !skb_queue_empty(&iucv->backlog_skb_q))
1820 len = atomic_read(&sk->sk_rmem_alloc);
1821 len += SKB_TRUESIZE(iucv_msg_length(msg));
1822 if (len > sk->sk_rcvbuf)
1825 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1829 iucv_process_message(sk, skb, path, msg);
1833 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1836 save_msg->path = path;
1837 save_msg->msg = *msg;
1839 list_add_tail(&save_msg->list, &iucv->message_q.list);
1842 spin_unlock(&iucv->message_q.lock);
1845 static void iucv_callback_txdone(struct iucv_path *path,
1846 struct iucv_message *msg)
1848 struct sock *sk = path->private;
1849 struct sk_buff *this = NULL;
1850 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1851 struct sk_buff *list_skb = list->next;
1852 unsigned long flags;
1854 if (!skb_queue_empty(list)) {
1855 spin_lock_irqsave(&list->lock, flags);
1857 while (list_skb != (struct sk_buff *)list) {
1858 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1862 list_skb = list_skb->next;
1865 __skb_unlink(this, list);
1867 spin_unlock_irqrestore(&list->lock, flags);
1871 /* wake up any process waiting for sending */
1872 iucv_sock_wake_msglim(sk);
1877 if (sk->sk_state == IUCV_CLOSING) {
1878 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1879 sk->sk_state = IUCV_CLOSED;
1880 sk->sk_state_change(sk);
1886 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1888 struct sock *sk = path->private;
1890 if (!list_empty(&iucv_sk(sk)->accept_q))
1891 sk->sk_state = IUCV_SEVERED;
1893 sk->sk_state = IUCV_DISCONN;
1895 sk->sk_state_change(sk);
1898 /* called if the other communication side shuts down its RECV direction;
1899 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1901 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1903 struct sock *sk = path->private;
1906 if (sk->sk_state != IUCV_CLOSED) {
1907 sk->sk_shutdown |= SEND_SHUTDOWN;
1908 sk->sk_state_change(sk);
1913 /***************** HiperSockets transport callbacks ********************/
1914 static void afiucv_swap_src_dest(struct sk_buff *skb)
1916 struct af_iucv_trans_hdr *trans_hdr =
1917 (struct af_iucv_trans_hdr *)skb->data;
1921 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1922 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1923 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1924 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1925 memcpy(tmpID, trans_hdr->srcUserID, 8);
1926 memcpy(tmpName, trans_hdr->srcAppName, 8);
1927 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1928 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1929 memcpy(trans_hdr->destUserID, tmpID, 8);
1930 memcpy(trans_hdr->destAppName, tmpName, 8);
1931 skb_push(skb, ETH_HLEN);
1932 memset(skb->data, 0, ETH_HLEN);
1936 * afiucv_hs_callback_syn - react on received SYN
1938 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1941 struct iucv_sock *iucv, *niucv;
1942 struct af_iucv_trans_hdr *trans_hdr;
1946 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1948 /* no sock - connection refused */
1949 afiucv_swap_src_dest(skb);
1950 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1951 err = dev_queue_xmit(skb);
1955 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1957 if ((sk->sk_state != IUCV_LISTEN) ||
1958 sk_acceptq_is_full(sk) ||
1960 /* error on server socket - connection refused */
1963 afiucv_swap_src_dest(skb);
1964 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1965 err = dev_queue_xmit(skb);
1970 niucv = iucv_sk(nsk);
1971 iucv_sock_init(nsk, sk);
1972 niucv->transport = AF_IUCV_TRANS_HIPER;
1973 niucv->msglimit = iucv->msglimit;
1974 if (!trans_hdr->window)
1975 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1977 niucv->msglimit_peer = trans_hdr->window;
1978 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1979 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1980 memcpy(niucv->src_name, iucv->src_name, 8);
1981 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1982 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1983 afiucv_swap_src_dest(skb);
1984 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1985 trans_hdr->window = niucv->msglimit;
1986 /* if receiver acks the xmit connection is established */
1987 err = dev_queue_xmit(skb);
1989 iucv_accept_enqueue(sk, nsk);
1990 nsk->sk_state = IUCV_CONNECTED;
1991 sk->sk_data_ready(sk, 1);
1993 iucv_sock_kill(nsk);
1997 return NET_RX_SUCCESS;
2001 * afiucv_hs_callback_synack() - react on received SYN-ACK
2003 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2005 struct iucv_sock *iucv = iucv_sk(sk);
2006 struct af_iucv_trans_hdr *trans_hdr =
2007 (struct af_iucv_trans_hdr *)skb->data;
2011 if (sk->sk_state != IUCV_BOUND)
2014 iucv->msglimit_peer = trans_hdr->window;
2015 sk->sk_state = IUCV_CONNECTED;
2016 sk->sk_state_change(sk);
2020 return NET_RX_SUCCESS;
2024 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2026 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2028 struct iucv_sock *iucv = iucv_sk(sk);
2032 if (sk->sk_state != IUCV_BOUND)
2035 sk->sk_state = IUCV_DISCONN;
2036 sk->sk_state_change(sk);
2040 return NET_RX_SUCCESS;
2044 * afiucv_hs_callback_fin() - react on received FIN
2046 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2048 struct iucv_sock *iucv = iucv_sk(sk);
2050 /* other end of connection closed */
2053 if (!list_empty(&iucv->accept_q))
2054 sk->sk_state = IUCV_SEVERED;
2056 sk->sk_state = IUCV_DISCONN;
2057 sk->sk_state_change(sk);
2061 return NET_RX_SUCCESS;
2065 * afiucv_hs_callback_win() - react on received WIN
2067 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2069 struct iucv_sock *iucv = iucv_sk(sk);
2070 struct af_iucv_trans_hdr *trans_hdr =
2071 (struct af_iucv_trans_hdr *)skb->data;
2074 return NET_RX_SUCCESS;
2076 if (sk->sk_state != IUCV_CONNECTED)
2077 return NET_RX_SUCCESS;
2079 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2080 iucv_sock_wake_msglim(sk);
2081 return NET_RX_SUCCESS;
2085 * afiucv_hs_callback_rx() - react on received data
2087 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2089 struct iucv_sock *iucv = iucv_sk(sk);
2093 return NET_RX_SUCCESS;
2096 if (sk->sk_state != IUCV_CONNECTED) {
2098 return NET_RX_SUCCESS;
2101 /* write stuff from iucv_msg to skb cb */
2102 if (skb->len <= sizeof(struct af_iucv_trans_hdr)) {
2104 return NET_RX_SUCCESS;
2106 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2107 skb_reset_transport_header(skb);
2108 skb_reset_network_header(skb);
2109 spin_lock(&iucv->message_q.lock);
2110 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2111 if (sock_queue_rcv_skb(sk, skb)) {
2112 /* handle rcv queue full */
2113 skb_queue_tail(&iucv->backlog_skb_q, skb);
2116 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2117 spin_unlock(&iucv->message_q.lock);
2118 return NET_RX_SUCCESS;
2122 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2124 * called from netif RX softirq
2126 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2127 struct packet_type *pt, struct net_device *orig_dev)
2129 struct hlist_node *node;
2131 struct iucv_sock *iucv;
2132 struct af_iucv_trans_hdr *trans_hdr;
2136 skb_pull(skb, ETH_HLEN);
2137 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2138 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2139 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2140 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2141 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2142 memset(nullstring, 0, sizeof(nullstring));
2145 read_lock(&iucv_sk_list.lock);
2146 sk_for_each(sk, node, &iucv_sk_list.head) {
2147 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2148 if ((!memcmp(&iucv_sk(sk)->src_name,
2149 trans_hdr->destAppName, 8)) &&
2150 (!memcmp(&iucv_sk(sk)->src_user_id,
2151 trans_hdr->destUserID, 8)) &&
2152 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2153 (!memcmp(&iucv_sk(sk)->dst_user_id,
2159 if ((!memcmp(&iucv_sk(sk)->src_name,
2160 trans_hdr->destAppName, 8)) &&
2161 (!memcmp(&iucv_sk(sk)->src_user_id,
2162 trans_hdr->destUserID, 8)) &&
2163 (!memcmp(&iucv_sk(sk)->dst_name,
2164 trans_hdr->srcAppName, 8)) &&
2165 (!memcmp(&iucv_sk(sk)->dst_user_id,
2166 trans_hdr->srcUserID, 8))) {
2172 read_unlock(&iucv_sk_list.lock);
2177 how should we send with no sock
2178 1) send without sock no send rc checking?
2179 2) introduce default sock to handle this cases
2181 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2183 SYN|ACK, SYN|FIN, FIN -> no action? */
2185 switch (trans_hdr->flags) {
2186 case AF_IUCV_FLAG_SYN:
2187 /* connect request */
2188 err = afiucv_hs_callback_syn(sk, skb);
2190 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2191 /* connect request confirmed */
2192 err = afiucv_hs_callback_synack(sk, skb);
2194 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2195 /* connect request refused */
2196 err = afiucv_hs_callback_synfin(sk, skb);
2198 case (AF_IUCV_FLAG_FIN):
2200 err = afiucv_hs_callback_fin(sk, skb);
2202 case (AF_IUCV_FLAG_WIN):
2203 err = afiucv_hs_callback_win(sk, skb);
2204 if (skb->len > sizeof(struct af_iucv_trans_hdr))
2205 err = afiucv_hs_callback_rx(sk, skb);
2210 /* plain data frame */
2211 err = afiucv_hs_callback_rx(sk, skb);
2221 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2224 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2225 enum iucv_tx_notify n)
2227 struct sock *isk = skb->sk;
2228 struct sock *sk = NULL;
2229 struct iucv_sock *iucv = NULL;
2230 struct sk_buff_head *list;
2231 struct sk_buff *list_skb;
2232 struct sk_buff *this = NULL;
2233 unsigned long flags;
2234 struct hlist_node *node;
2236 read_lock(&iucv_sk_list.lock);
2237 sk_for_each(sk, node, &iucv_sk_list.head)
2242 read_unlock(&iucv_sk_list.lock);
2248 list = &iucv->send_skb_q;
2249 list_skb = list->next;
2250 if (skb_queue_empty(list))
2253 spin_lock_irqsave(&list->lock, flags);
2254 while (list_skb != (struct sk_buff *)list) {
2255 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2259 __skb_unlink(this, list);
2260 iucv_sock_wake_msglim(sk);
2263 case TX_NOTIFY_PENDING:
2264 atomic_inc(&iucv->pendings);
2266 case TX_NOTIFY_DELAYED_OK:
2267 __skb_unlink(this, list);
2268 atomic_dec(&iucv->pendings);
2269 if (atomic_read(&iucv->pendings) <= 0)
2270 iucv_sock_wake_msglim(sk);
2273 case TX_NOTIFY_UNREACHABLE:
2274 case TX_NOTIFY_DELAYED_UNREACHABLE:
2275 case TX_NOTIFY_TPQFULL: /* not yet used */
2276 case TX_NOTIFY_GENERALERROR:
2277 case TX_NOTIFY_DELAYED_GENERALERROR:
2278 __skb_unlink(this, list);
2280 if (!list_empty(&iucv->accept_q))
2281 sk->sk_state = IUCV_SEVERED;
2283 sk->sk_state = IUCV_DISCONN;
2284 sk->sk_state_change(sk);
2289 list_skb = list_skb->next;
2291 spin_unlock_irqrestore(&list->lock, flags);
2296 static const struct proto_ops iucv_sock_ops = {
2298 .owner = THIS_MODULE,
2299 .release = iucv_sock_release,
2300 .bind = iucv_sock_bind,
2301 .connect = iucv_sock_connect,
2302 .listen = iucv_sock_listen,
2303 .accept = iucv_sock_accept,
2304 .getname = iucv_sock_getname,
2305 .sendmsg = iucv_sock_sendmsg,
2306 .recvmsg = iucv_sock_recvmsg,
2307 .poll = iucv_sock_poll,
2308 .ioctl = sock_no_ioctl,
2309 .mmap = sock_no_mmap,
2310 .socketpair = sock_no_socketpair,
2311 .shutdown = iucv_sock_shutdown,
2312 .setsockopt = iucv_sock_setsockopt,
2313 .getsockopt = iucv_sock_getsockopt,
2316 static const struct net_proto_family iucv_sock_family_ops = {
2318 .owner = THIS_MODULE,
2319 .create = iucv_sock_create,
2322 static struct packet_type iucv_packet_type = {
2323 .type = cpu_to_be16(ETH_P_AF_IUCV),
2324 .func = afiucv_hs_rcv,
2327 static int afiucv_iucv_init(void)
2331 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2334 /* establish dummy device */
2335 af_iucv_driver.bus = pr_iucv->bus;
2336 err = driver_register(&af_iucv_driver);
2339 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2344 dev_set_name(af_iucv_dev, "af_iucv");
2345 af_iucv_dev->bus = pr_iucv->bus;
2346 af_iucv_dev->parent = pr_iucv->root;
2347 af_iucv_dev->release = (void (*)(struct device *))kfree;
2348 af_iucv_dev->driver = &af_iucv_driver;
2349 err = device_register(af_iucv_dev);
2355 driver_unregister(&af_iucv_driver);
2357 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2362 static int __init afiucv_init(void)
2366 if (MACHINE_IS_VM) {
2367 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2368 if (unlikely(err)) {
2370 err = -EPROTONOSUPPORT;
2374 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2376 printk(KERN_WARNING "iucv_if lookup failed\n");
2377 memset(&iucv_userid, 0, sizeof(iucv_userid));
2380 memset(&iucv_userid, 0, sizeof(iucv_userid));
2384 err = proto_register(&iucv_proto, 0);
2387 err = sock_register(&iucv_sock_family_ops);
2392 err = afiucv_iucv_init();
2396 dev_add_pack(&iucv_packet_type);
2400 sock_unregister(PF_IUCV);
2402 proto_unregister(&iucv_proto);
2405 symbol_put(iucv_if);
2409 static void __exit afiucv_exit(void)
2412 device_unregister(af_iucv_dev);
2413 driver_unregister(&af_iucv_driver);
2414 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2415 symbol_put(iucv_if);
2417 dev_remove_pack(&iucv_packet_type);
2418 sock_unregister(PF_IUCV);
2419 proto_unregister(&iucv_proto);
2422 module_init(afiucv_init);
2423 module_exit(afiucv_exit);
2425 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2426 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2427 MODULE_VERSION(VERSION);
2428 MODULE_LICENSE("GPL");
2429 MODULE_ALIAS_NETPROTO(PF_IUCV);