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>
25 #include <linux/security.h>
27 #include <asm/ebcdic.h>
28 #include <asm/cpcmd.h>
29 #include <linux/kmod.h>
31 #include <net/iucv/af_iucv.h>
35 static char iucv_userid[80];
37 static const struct proto_ops iucv_sock_ops;
39 static struct proto iucv_proto = {
42 .obj_size = sizeof(struct iucv_sock),
45 static struct iucv_interface *pr_iucv;
47 /* special AF_IUCV IPRM messages */
48 static const u8 iprm_shutdown[8] =
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
51 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
53 #define __iucv_sock_wait(sk, condition, timeo, ret) \
55 DEFINE_WAIT(__wait); \
56 long __timeo = timeo; \
58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
59 while (!(condition)) { \
64 if (signal_pending(current)) { \
65 ret = sock_intr_errno(__timeo); \
69 __timeo = schedule_timeout(__timeo); \
71 ret = sock_error(sk); \
75 finish_wait(sk_sleep(sk), &__wait); \
78 #define iucv_sock_wait(sk, condition, timeo) \
82 __iucv_sock_wait(sk, condition, timeo, __ret); \
86 static void iucv_sock_kill(struct sock *sk);
87 static void iucv_sock_close(struct sock *sk);
88 static void iucv_sever_path(struct sock *, int);
90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
91 struct packet_type *pt, struct net_device *orig_dev);
92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
93 struct sk_buff *skb, u8 flags);
94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
96 /* Call Back functions */
97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
99 static void iucv_callback_connack(struct iucv_path *, u8 *);
100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
118 static inline void high_nmcpy(unsigned char *dst, char *src)
123 static inline void low_nmcpy(unsigned char *dst, char *src)
125 memcpy(&dst[8], src, 8);
128 static int afiucv_pm_prepare(struct device *dev)
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
136 static void afiucv_pm_complete(struct device *dev)
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
147 * Sever all established IUCV communication pathes
149 static int afiucv_pm_freeze(struct device *dev)
151 struct iucv_sock *iucv;
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
161 switch (sk->sk_state) {
165 iucv_sever_path(sk, 0);
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
177 read_unlock(&iucv_sk_list.lock);
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
185 * socket clean up after freeze
187 static int afiucv_pm_restore_thaw(struct device *dev)
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
211 read_unlock(&iucv_sk_list.lock);
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
227 .pm = &afiucv_pm_ops,
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
245 * The socket data length is computed by subtracting the socket data length
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
251 * Use this function to allocate socket buffers to store iucv message data.
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
270 * Returns true if the socket in either in the first or second state.
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
274 return (sk->sk_state == state || sk->sk_state == state2);
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
285 static inline int iucv_below_msglim(struct sock *sk)
287 struct iucv_sock *iucv = iucv_sk(sk);
289 if (sk->sk_state != IUCV_CONNECTED)
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
301 static void iucv_sock_wake_msglim(struct sock *sk)
303 struct socket_wq *wq;
306 wq = rcu_dereference(sk->sk_wq);
307 if (skwq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
314 * afiucv_hs_send() - send a message through HiperSockets transport
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
355 skb->dev = iucv->hs_dev;
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
364 skb_trim(skb, skb->dev->mtu);
366 skb->protocol = ETH_P_AF_IUCV;
367 nskb = skb_clone(skb, GFP_ATOMIC);
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
372 if (net_xmit_eval(err)) {
373 skb_unlink(nskb, &iucv->send_skb_q);
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
379 return net_xmit_eval(err);
382 static struct sock *__iucv_get_sock_by_name(char *nm)
386 sk_for_each(sk, &iucv_sk_list.head)
387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
393 static void iucv_sock_destruct(struct sock *sk)
395 skb_queue_purge(&sk->sk_receive_queue);
396 skb_queue_purge(&sk->sk_error_queue);
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
412 static void iucv_sock_cleanup_listen(struct sock *parent)
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
422 parent->sk_state = IUCV_CLOSED;
425 /* Kill socket (only if zapped and orphaned) */
426 static void iucv_sock_kill(struct sock *sk)
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
436 /* Terminate an IUCV path */
437 static void iucv_sever_path(struct sock *sk, int with_user_data)
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
456 /* Send controlling flags through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
464 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
465 if (sk->sk_shutdown & SEND_SHUTDOWN) {
466 /* controlling flags should be sent anyway */
467 shutdown = sk->sk_shutdown;
468 sk->sk_shutdown &= RCV_SHUTDOWN;
470 skb = sock_alloc_send_skb(sk, blen, 1, &err);
472 skb_reserve(skb, blen);
473 err = afiucv_hs_send(NULL, sk, skb, flags);
476 sk->sk_shutdown = shutdown;
480 /* Close an IUCV socket */
481 static void iucv_sock_close(struct sock *sk)
483 struct iucv_sock *iucv = iucv_sk(sk);
489 switch (sk->sk_state) {
491 iucv_sock_cleanup_listen(sk);
495 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
496 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
497 sk->sk_state = IUCV_DISCONN;
498 sk->sk_state_change(sk);
500 case IUCV_DISCONN: /* fall through */
501 sk->sk_state = IUCV_CLOSING;
502 sk->sk_state_change(sk);
504 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
505 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
506 timeo = sk->sk_lingertime;
508 timeo = IUCV_DISCONN_TIMEOUT;
510 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
514 case IUCV_CLOSING: /* fall through */
515 sk->sk_state = IUCV_CLOSED;
516 sk->sk_state_change(sk);
518 sk->sk_err = ECONNRESET;
519 sk->sk_state_change(sk);
521 skb_queue_purge(&iucv->send_skb_q);
522 skb_queue_purge(&iucv->backlog_skb_q);
524 default: /* fall through */
525 iucv_sever_path(sk, 1);
529 dev_put(iucv->hs_dev);
531 sk->sk_bound_dev_if = 0;
534 /* mark socket for deletion by iucv_sock_kill() */
535 sock_set_flag(sk, SOCK_ZAPPED);
540 static void iucv_sock_init(struct sock *sk, struct sock *parent)
543 sk->sk_type = parent->sk_type;
544 security_sk_clone(parent, sk);
548 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
551 struct iucv_sock *iucv;
553 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
558 sock_init_data(sock, sk);
559 INIT_LIST_HEAD(&iucv->accept_q);
560 spin_lock_init(&iucv->accept_q_lock);
561 skb_queue_head_init(&iucv->send_skb_q);
562 INIT_LIST_HEAD(&iucv->message_q.list);
563 spin_lock_init(&iucv->message_q.lock);
564 skb_queue_head_init(&iucv->backlog_skb_q);
566 atomic_set(&iucv->pendings, 0);
569 atomic_set(&iucv->msg_sent, 0);
570 atomic_set(&iucv->msg_recv, 0);
572 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
573 memset(&iucv->src_user_id , 0, 32);
575 iucv->transport = AF_IUCV_TRANS_IUCV;
577 iucv->transport = AF_IUCV_TRANS_HIPER;
579 sk->sk_destruct = iucv_sock_destruct;
580 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
581 sk->sk_allocation = GFP_DMA;
583 sock_reset_flag(sk, SOCK_ZAPPED);
585 sk->sk_protocol = proto;
586 sk->sk_state = IUCV_OPEN;
588 iucv_sock_link(&iucv_sk_list, sk);
592 /* Create an IUCV socket */
593 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
598 if (protocol && protocol != PF_IUCV)
599 return -EPROTONOSUPPORT;
601 sock->state = SS_UNCONNECTED;
603 switch (sock->type) {
605 sock->ops = &iucv_sock_ops;
608 /* currently, proto ops can handle both sk types */
609 sock->ops = &iucv_sock_ops;
612 return -ESOCKTNOSUPPORT;
615 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
619 iucv_sock_init(sk, NULL);
624 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
626 write_lock_bh(&l->lock);
627 sk_add_node(sk, &l->head);
628 write_unlock_bh(&l->lock);
631 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
633 write_lock_bh(&l->lock);
634 sk_del_node_init(sk);
635 write_unlock_bh(&l->lock);
638 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
641 struct iucv_sock *par = iucv_sk(parent);
644 spin_lock_irqsave(&par->accept_q_lock, flags);
645 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
646 spin_unlock_irqrestore(&par->accept_q_lock, flags);
647 iucv_sk(sk)->parent = parent;
648 sk_acceptq_added(parent);
651 void iucv_accept_unlink(struct sock *sk)
654 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
656 spin_lock_irqsave(&par->accept_q_lock, flags);
657 list_del_init(&iucv_sk(sk)->accept_q);
658 spin_unlock_irqrestore(&par->accept_q_lock, flags);
659 sk_acceptq_removed(iucv_sk(sk)->parent);
660 iucv_sk(sk)->parent = NULL;
664 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
666 struct iucv_sock *isk, *n;
669 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
670 sk = (struct sock *) isk;
673 if (sk->sk_state == IUCV_CLOSED) {
674 iucv_accept_unlink(sk);
679 if (sk->sk_state == IUCV_CONNECTED ||
680 sk->sk_state == IUCV_DISCONN ||
682 iucv_accept_unlink(sk);
684 sock_graft(sk, newsock);
695 static void __iucv_auto_name(struct iucv_sock *iucv)
699 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
700 while (__iucv_get_sock_by_name(name)) {
701 sprintf(name, "%08x",
702 atomic_inc_return(&iucv_sk_list.autobind_name));
704 memcpy(iucv->src_name, name, 8);
707 /* Bind an unbound socket */
708 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
711 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
712 struct sock *sk = sock->sk;
713 struct iucv_sock *iucv;
715 struct net_device *dev;
718 /* Verify the input sockaddr */
719 if (!addr || addr->sa_family != AF_IUCV)
722 if (addr_len < sizeof(struct sockaddr_iucv))
726 if (sk->sk_state != IUCV_OPEN) {
731 write_lock_bh(&iucv_sk_list.lock);
734 if (__iucv_get_sock_by_name(sa->siucv_name)) {
741 /* Bind the socket */
743 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
744 goto vm_bind; /* VM IUCV transport */
746 /* try hiper transport */
747 memcpy(uid, sa->siucv_user_id, sizeof(uid));
750 for_each_netdev_rcu(&init_net, dev) {
751 if (!memcmp(dev->perm_addr, uid, 8)) {
752 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
753 /* Check for unitialized siucv_name */
754 if (strncmp(sa->siucv_name, " ", 8) == 0)
755 __iucv_auto_name(iucv);
757 memcpy(iucv->src_name, sa->siucv_name, 8);
758 sk->sk_bound_dev_if = dev->ifindex;
761 sk->sk_state = IUCV_BOUND;
762 iucv->transport = AF_IUCV_TRANS_HIPER;
764 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
772 /* use local userid for backward compat */
773 memcpy(iucv->src_name, sa->siucv_name, 8);
774 memcpy(iucv->src_user_id, iucv_userid, 8);
775 sk->sk_state = IUCV_BOUND;
776 iucv->transport = AF_IUCV_TRANS_IUCV;
778 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
781 /* found no dev to bind */
784 /* Release the socket list lock */
785 write_unlock_bh(&iucv_sk_list.lock);
791 /* Automatically bind an unbound socket */
792 static int iucv_sock_autobind(struct sock *sk)
794 struct iucv_sock *iucv = iucv_sk(sk);
797 if (unlikely(!pr_iucv))
800 memcpy(iucv->src_user_id, iucv_userid, 8);
802 write_lock_bh(&iucv_sk_list.lock);
803 __iucv_auto_name(iucv);
804 write_unlock_bh(&iucv_sk_list.lock);
807 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
812 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
814 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
815 struct sock *sk = sock->sk;
816 struct iucv_sock *iucv = iucv_sk(sk);
817 unsigned char user_data[16];
820 high_nmcpy(user_data, sa->siucv_name);
821 low_nmcpy(user_data, iucv->src_name);
822 ASCEBC(user_data, sizeof(user_data));
825 iucv->path = iucv_path_alloc(iucv->msglimit,
826 IUCV_IPRMDATA, GFP_KERNEL);
831 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
832 sa->siucv_user_id, NULL, user_data,
835 iucv_path_free(iucv->path);
838 case 0x0b: /* Target communicator is not logged on */
841 case 0x0d: /* Max connections for this guest exceeded */
842 case 0x0e: /* Max connections for target guest exceeded */
845 case 0x0f: /* Missing IUCV authorization */
857 /* Connect an unconnected socket */
858 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
861 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
862 struct sock *sk = sock->sk;
863 struct iucv_sock *iucv = iucv_sk(sk);
866 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
869 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
872 if (sk->sk_state == IUCV_OPEN &&
873 iucv->transport == AF_IUCV_TRANS_HIPER)
874 return -EBADFD; /* explicit bind required */
876 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
879 if (sk->sk_state == IUCV_OPEN) {
880 err = iucv_sock_autobind(sk);
887 /* Set the destination information */
888 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
889 memcpy(iucv->dst_name, sa->siucv_name, 8);
891 if (iucv->transport == AF_IUCV_TRANS_HIPER)
892 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
894 err = afiucv_path_connect(sock, addr);
898 if (sk->sk_state != IUCV_CONNECTED)
899 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
901 sock_sndtimeo(sk, flags & O_NONBLOCK));
903 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
906 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
907 iucv_sever_path(sk, 0);
914 /* Move a socket into listening state. */
915 static int iucv_sock_listen(struct socket *sock, int backlog)
917 struct sock *sk = sock->sk;
923 if (sk->sk_state != IUCV_BOUND)
926 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
929 sk->sk_max_ack_backlog = backlog;
930 sk->sk_ack_backlog = 0;
931 sk->sk_state = IUCV_LISTEN;
939 /* Accept a pending connection */
940 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
943 DECLARE_WAITQUEUE(wait, current);
944 struct sock *sk = sock->sk, *nsk;
948 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
950 if (sk->sk_state != IUCV_LISTEN) {
955 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
957 /* Wait for an incoming connection */
958 add_wait_queue_exclusive(sk_sleep(sk), &wait);
959 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
960 set_current_state(TASK_INTERRUPTIBLE);
967 timeo = schedule_timeout(timeo);
968 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
970 if (sk->sk_state != IUCV_LISTEN) {
975 if (signal_pending(current)) {
976 err = sock_intr_errno(timeo);
981 set_current_state(TASK_RUNNING);
982 remove_wait_queue(sk_sleep(sk), &wait);
987 newsock->state = SS_CONNECTED;
994 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
997 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
998 struct sock *sk = sock->sk;
999 struct iucv_sock *iucv = iucv_sk(sk);
1001 addr->sa_family = AF_IUCV;
1002 *len = sizeof(struct sockaddr_iucv);
1005 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1006 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1008 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1009 memcpy(siucv->siucv_name, iucv->src_name, 8);
1011 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1012 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1013 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1019 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1021 * @msg: Pointer to a struct iucv_message
1022 * @skb: The socket data to send, skb->len MUST BE <= 7
1024 * Send the socket data in the parameter list in the iucv message
1025 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1026 * list and the socket data len at index 7 (last byte).
1027 * See also iucv_msg_length().
1029 * Returns the error code from the iucv_message_send() call.
1031 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1032 struct sk_buff *skb)
1036 memcpy(prmdata, (void *) skb->data, skb->len);
1037 prmdata[7] = 0xff - (u8) skb->len;
1038 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1039 (void *) prmdata, 8);
1042 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1045 struct sock *sk = sock->sk;
1046 struct iucv_sock *iucv = iucv_sk(sk);
1047 size_t headroom = 0;
1049 struct sk_buff *skb;
1050 struct iucv_message txmsg = {0};
1051 struct cmsghdr *cmsg;
1057 int noblock = msg->msg_flags & MSG_DONTWAIT;
1059 err = sock_error(sk);
1063 if (msg->msg_flags & MSG_OOB)
1066 /* SOCK_SEQPACKET: we do not support segmented records */
1067 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1072 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1077 /* Return if the socket is not in connected state */
1078 if (sk->sk_state != IUCV_CONNECTED) {
1083 /* initialize defaults */
1084 cmsg_done = 0; /* check for duplicate headers */
1087 /* iterate over control messages */
1088 for_each_cmsghdr(cmsg, msg) {
1089 if (!CMSG_OK(msg, cmsg)) {
1094 if (cmsg->cmsg_level != SOL_IUCV)
1097 if (cmsg->cmsg_type & cmsg_done) {
1101 cmsg_done |= cmsg->cmsg_type;
1103 switch (cmsg->cmsg_type) {
1104 case SCM_IUCV_TRGCLS:
1105 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1110 /* set iucv message target class */
1111 memcpy(&txmsg.class,
1112 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1122 /* allocate one skb for each iucv message:
1123 * this is fine for SOCK_SEQPACKET (unless we want to support
1124 * segmented records using the MSG_EOR flag), but
1125 * for SOCK_STREAM we might want to improve it in future */
1126 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1127 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1130 if (len < PAGE_SIZE) {
1133 /* In nonlinear "classic" iucv skb,
1134 * reserve space for iucv_array
1136 headroom = sizeof(struct iucv_array) *
1137 (MAX_SKB_FRAGS + 1);
1138 linear = PAGE_SIZE - headroom;
1141 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1146 skb_reserve(skb, headroom);
1147 skb_put(skb, linear);
1149 skb->data_len = len - linear;
1150 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1154 /* wait if outstanding messages for iucv path has reached */
1155 timeo = sock_sndtimeo(sk, noblock);
1156 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1160 /* return -ECONNRESET if the socket is no longer connected */
1161 if (sk->sk_state != IUCV_CONNECTED) {
1166 /* increment and save iucv message tag for msg_completion cbk */
1167 txmsg.tag = iucv->send_tag++;
1168 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1170 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1171 atomic_inc(&iucv->msg_sent);
1172 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1174 atomic_dec(&iucv->msg_sent);
1177 } else { /* Classic VM IUCV transport */
1178 skb_queue_tail(&iucv->send_skb_q, skb);
1180 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1182 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1184 /* on success: there is no message_complete callback */
1185 /* for an IPRMDATA msg; remove skb from send queue */
1187 skb_unlink(skb, &iucv->send_skb_q);
1191 /* this error should never happen since the */
1192 /* IUCV_IPRMDATA path flag is set... sever path */
1194 pr_iucv->path_sever(iucv->path, NULL);
1195 skb_unlink(skb, &iucv->send_skb_q);
1199 } else if (skb_is_nonlinear(skb)) {
1200 struct iucv_array *iba = (struct iucv_array *)skb->head;
1203 /* skip iucv_array lying in the headroom */
1204 iba[0].address = (u32)(addr_t)skb->data;
1205 iba[0].length = (u32)skb_headlen(skb);
1206 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1207 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1209 iba[i + 1].address =
1210 (u32)(addr_t)skb_frag_address(frag);
1211 iba[i + 1].length = (u32)skb_frag_size(frag);
1213 err = pr_iucv->message_send(iucv->path, &txmsg,
1215 (void *)iba, skb->len);
1216 } else { /* non-IPRM Linear skb */
1217 err = pr_iucv->message_send(iucv->path, &txmsg,
1218 0, 0, (void *)skb->data, skb->len);
1223 memcpy(user_id, iucv->dst_user_id, 8);
1225 memcpy(appl_id, iucv->dst_name, 8);
1227 "Application %s on z/VM guest %s exceeds message limit\n",
1233 skb_unlink(skb, &iucv->send_skb_q);
1248 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1250 size_t headroom, linear;
1251 struct sk_buff *skb;
1254 if (len < PAGE_SIZE) {
1258 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1259 linear = PAGE_SIZE - headroom;
1261 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1262 0, &err, GFP_ATOMIC | GFP_DMA);
1264 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1268 skb_reserve(skb, headroom);
1269 skb_put(skb, linear);
1271 skb->data_len = len - linear;
1276 /* iucv_process_message() - Receive a single outstanding IUCV message
1278 * Locking: must be called with message_q.lock held
1280 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1281 struct iucv_path *path,
1282 struct iucv_message *msg)
1287 len = iucv_msg_length(msg);
1289 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1290 /* Note: the first 4 bytes are reserved for msg tag */
1291 IUCV_SKB_CB(skb)->class = msg->class;
1293 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1294 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1295 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1300 if (skb_is_nonlinear(skb)) {
1301 struct iucv_array *iba = (struct iucv_array *)skb->head;
1304 iba[0].address = (u32)(addr_t)skb->data;
1305 iba[0].length = (u32)skb_headlen(skb);
1306 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1307 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1309 iba[i + 1].address =
1310 (u32)(addr_t)skb_frag_address(frag);
1311 iba[i + 1].length = (u32)skb_frag_size(frag);
1313 rc = pr_iucv->message_receive(path, msg,
1315 (void *)iba, len, NULL);
1317 rc = pr_iucv->message_receive(path, msg,
1318 msg->flags & IUCV_IPRMDATA,
1319 skb->data, len, NULL);
1325 WARN_ON_ONCE(skb->len != len);
1328 IUCV_SKB_CB(skb)->offset = 0;
1329 if (sk_filter(sk, skb)) {
1330 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1334 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1335 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1338 /* iucv_process_message_q() - Process outstanding IUCV messages
1340 * Locking: must be called with message_q.lock held
1342 static void iucv_process_message_q(struct sock *sk)
1344 struct iucv_sock *iucv = iucv_sk(sk);
1345 struct sk_buff *skb;
1346 struct sock_msg_q *p, *n;
1348 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1349 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1352 iucv_process_message(sk, skb, p->path, &p->msg);
1355 if (!skb_queue_empty(&iucv->backlog_skb_q))
1360 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1361 size_t len, int flags)
1363 int noblock = flags & MSG_DONTWAIT;
1364 struct sock *sk = sock->sk;
1365 struct iucv_sock *iucv = iucv_sk(sk);
1366 unsigned int copied, rlen;
1367 struct sk_buff *skb, *rskb, *cskb;
1371 if ((sk->sk_state == IUCV_DISCONN) &&
1372 skb_queue_empty(&iucv->backlog_skb_q) &&
1373 skb_queue_empty(&sk->sk_receive_queue) &&
1374 list_empty(&iucv->message_q.list))
1377 if (flags & (MSG_OOB))
1380 /* receive/dequeue next skb:
1381 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1382 skb = skb_recv_datagram(sk, flags, noblock, &err);
1384 if (sk->sk_shutdown & RCV_SHUTDOWN)
1389 offset = IUCV_SKB_CB(skb)->offset;
1390 rlen = skb->len - offset; /* real length of skb */
1391 copied = min_t(unsigned int, rlen, len);
1393 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1396 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1397 if (!(flags & MSG_PEEK))
1398 skb_queue_head(&sk->sk_receive_queue, skb);
1402 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1403 if (sk->sk_type == SOCK_SEQPACKET) {
1405 msg->msg_flags |= MSG_TRUNC;
1406 /* each iucv message contains a complete record */
1407 msg->msg_flags |= MSG_EOR;
1410 /* create control message to store iucv msg target class:
1411 * get the trgcls from the control buffer of the skb due to
1412 * fragmentation of original iucv message. */
1413 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1414 sizeof(IUCV_SKB_CB(skb)->class),
1415 (void *)&IUCV_SKB_CB(skb)->class);
1417 if (!(flags & MSG_PEEK))
1418 skb_queue_head(&sk->sk_receive_queue, skb);
1422 /* Mark read part of skb as used */
1423 if (!(flags & MSG_PEEK)) {
1425 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1426 if (sk->sk_type == SOCK_STREAM) {
1427 if (copied < rlen) {
1428 IUCV_SKB_CB(skb)->offset = offset + copied;
1429 skb_queue_head(&sk->sk_receive_queue, skb);
1435 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1436 atomic_inc(&iucv->msg_recv);
1437 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1439 iucv_sock_close(sk);
1444 /* Queue backlog skbs */
1445 spin_lock_bh(&iucv->message_q.lock);
1446 rskb = skb_dequeue(&iucv->backlog_skb_q);
1448 IUCV_SKB_CB(rskb)->offset = 0;
1449 if (__sock_queue_rcv_skb(sk, rskb)) {
1450 /* handle rcv queue full */
1451 skb_queue_head(&iucv->backlog_skb_q,
1455 rskb = skb_dequeue(&iucv->backlog_skb_q);
1457 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1458 if (!list_empty(&iucv->message_q.list))
1459 iucv_process_message_q(sk);
1460 if (atomic_read(&iucv->msg_recv) >=
1461 iucv->msglimit / 2) {
1462 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1464 sk->sk_state = IUCV_DISCONN;
1465 sk->sk_state_change(sk);
1469 spin_unlock_bh(&iucv->message_q.lock);
1473 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1474 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1480 static inline unsigned int iucv_accept_poll(struct sock *parent)
1482 struct iucv_sock *isk, *n;
1485 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1486 sk = (struct sock *) isk;
1488 if (sk->sk_state == IUCV_CONNECTED)
1489 return POLLIN | POLLRDNORM;
1495 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1498 struct sock *sk = sock->sk;
1499 unsigned int mask = 0;
1501 sock_poll_wait(file, sk_sleep(sk), wait);
1503 if (sk->sk_state == IUCV_LISTEN)
1504 return iucv_accept_poll(sk);
1506 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1508 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1510 if (sk->sk_shutdown & RCV_SHUTDOWN)
1513 if (sk->sk_shutdown == SHUTDOWN_MASK)
1516 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1517 (sk->sk_shutdown & RCV_SHUTDOWN))
1518 mask |= POLLIN | POLLRDNORM;
1520 if (sk->sk_state == IUCV_CLOSED)
1523 if (sk->sk_state == IUCV_DISCONN)
1526 if (sock_writeable(sk) && iucv_below_msglim(sk))
1527 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1529 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1534 static int iucv_sock_shutdown(struct socket *sock, int how)
1536 struct sock *sk = sock->sk;
1537 struct iucv_sock *iucv = iucv_sk(sk);
1538 struct iucv_message txmsg;
1543 if ((how & ~SHUTDOWN_MASK) || !how)
1547 switch (sk->sk_state) {
1558 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1559 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1562 err = pr_iucv->message_send(iucv->path, &txmsg,
1563 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1578 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1581 sk->sk_shutdown |= how;
1582 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1583 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1585 err = pr_iucv->path_quiesce(iucv->path, NULL);
1588 /* skb_queue_purge(&sk->sk_receive_queue); */
1590 skb_queue_purge(&sk->sk_receive_queue);
1593 /* Wake up anyone sleeping in poll */
1594 sk->sk_state_change(sk);
1601 static int iucv_sock_release(struct socket *sock)
1603 struct sock *sk = sock->sk;
1609 iucv_sock_close(sk);
1616 /* getsockopt and setsockopt */
1617 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1618 char __user *optval, unsigned int optlen)
1620 struct sock *sk = sock->sk;
1621 struct iucv_sock *iucv = iucv_sk(sk);
1625 if (level != SOL_IUCV)
1626 return -ENOPROTOOPT;
1628 if (optlen < sizeof(int))
1631 if (get_user(val, (int __user *) optval))
1638 case SO_IPRMDATA_MSG:
1640 iucv->flags |= IUCV_IPRMDATA;
1642 iucv->flags &= ~IUCV_IPRMDATA;
1645 switch (sk->sk_state) {
1648 if (val < 1 || val > (u16)(~0))
1651 iucv->msglimit = val;
1667 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1668 char __user *optval, int __user *optlen)
1670 struct sock *sk = sock->sk;
1671 struct iucv_sock *iucv = iucv_sk(sk);
1675 if (level != SOL_IUCV)
1676 return -ENOPROTOOPT;
1678 if (get_user(len, optlen))
1684 len = min_t(unsigned int, len, sizeof(int));
1687 case SO_IPRMDATA_MSG:
1688 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1692 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1693 : iucv->msglimit; /* default */
1697 if (sk->sk_state == IUCV_OPEN)
1699 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1700 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1704 return -ENOPROTOOPT;
1707 if (put_user(len, optlen))
1709 if (copy_to_user(optval, &val, len))
1716 /* Callback wrappers - called from iucv base support */
1717 static int iucv_callback_connreq(struct iucv_path *path,
1718 u8 ipvmid[8], u8 ipuser[16])
1720 unsigned char user_data[16];
1721 unsigned char nuser_data[16];
1722 unsigned char src_name[8];
1723 struct sock *sk, *nsk;
1724 struct iucv_sock *iucv, *niucv;
1727 memcpy(src_name, ipuser, 8);
1728 EBCASC(src_name, 8);
1729 /* Find out if this path belongs to af_iucv. */
1730 read_lock(&iucv_sk_list.lock);
1733 sk_for_each(sk, &iucv_sk_list.head)
1734 if (sk->sk_state == IUCV_LISTEN &&
1735 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1737 * Found a listening socket with
1738 * src_name == ipuser[0-7].
1743 read_unlock(&iucv_sk_list.lock);
1745 /* No socket found, not one of our paths. */
1750 /* Check if parent socket is listening */
1751 low_nmcpy(user_data, iucv->src_name);
1752 high_nmcpy(user_data, iucv->dst_name);
1753 ASCEBC(user_data, sizeof(user_data));
1754 if (sk->sk_state != IUCV_LISTEN) {
1755 err = pr_iucv->path_sever(path, user_data);
1756 iucv_path_free(path);
1760 /* Check for backlog size */
1761 if (sk_acceptq_is_full(sk)) {
1762 err = pr_iucv->path_sever(path, user_data);
1763 iucv_path_free(path);
1767 /* Create the new socket */
1768 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1770 err = pr_iucv->path_sever(path, user_data);
1771 iucv_path_free(path);
1775 niucv = iucv_sk(nsk);
1776 iucv_sock_init(nsk, sk);
1778 /* Set the new iucv_sock */
1779 memcpy(niucv->dst_name, ipuser + 8, 8);
1780 EBCASC(niucv->dst_name, 8);
1781 memcpy(niucv->dst_user_id, ipvmid, 8);
1782 memcpy(niucv->src_name, iucv->src_name, 8);
1783 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1786 /* Call iucv_accept */
1787 high_nmcpy(nuser_data, ipuser + 8);
1788 memcpy(nuser_data + 8, niucv->src_name, 8);
1789 ASCEBC(nuser_data + 8, 8);
1791 /* set message limit for path based on msglimit of accepting socket */
1792 niucv->msglimit = iucv->msglimit;
1793 path->msglim = iucv->msglimit;
1794 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1796 iucv_sever_path(nsk, 1);
1797 iucv_sock_kill(nsk);
1801 iucv_accept_enqueue(sk, nsk);
1803 /* Wake up accept */
1804 nsk->sk_state = IUCV_CONNECTED;
1805 sk->sk_data_ready(sk);
1812 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1814 struct sock *sk = path->private;
1816 sk->sk_state = IUCV_CONNECTED;
1817 sk->sk_state_change(sk);
1820 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1822 struct sock *sk = path->private;
1823 struct iucv_sock *iucv = iucv_sk(sk);
1824 struct sk_buff *skb;
1825 struct sock_msg_q *save_msg;
1828 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1829 pr_iucv->message_reject(path, msg);
1833 spin_lock(&iucv->message_q.lock);
1835 if (!list_empty(&iucv->message_q.list) ||
1836 !skb_queue_empty(&iucv->backlog_skb_q))
1839 len = atomic_read(&sk->sk_rmem_alloc);
1840 len += SKB_TRUESIZE(iucv_msg_length(msg));
1841 if (len > sk->sk_rcvbuf)
1844 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1848 iucv_process_message(sk, skb, path, msg);
1852 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1855 save_msg->path = path;
1856 save_msg->msg = *msg;
1858 list_add_tail(&save_msg->list, &iucv->message_q.list);
1861 spin_unlock(&iucv->message_q.lock);
1864 static void iucv_callback_txdone(struct iucv_path *path,
1865 struct iucv_message *msg)
1867 struct sock *sk = path->private;
1868 struct sk_buff *this = NULL;
1869 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1870 struct sk_buff *list_skb = list->next;
1871 unsigned long flags;
1874 if (!skb_queue_empty(list)) {
1875 spin_lock_irqsave(&list->lock, flags);
1877 while (list_skb != (struct sk_buff *)list) {
1878 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1882 list_skb = list_skb->next;
1885 __skb_unlink(this, list);
1887 spin_unlock_irqrestore(&list->lock, flags);
1891 /* wake up any process waiting for sending */
1892 iucv_sock_wake_msglim(sk);
1896 if (sk->sk_state == IUCV_CLOSING) {
1897 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1898 sk->sk_state = IUCV_CLOSED;
1899 sk->sk_state_change(sk);
1906 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1908 struct sock *sk = path->private;
1910 if (sk->sk_state == IUCV_CLOSED)
1914 iucv_sever_path(sk, 1);
1915 sk->sk_state = IUCV_DISCONN;
1917 sk->sk_state_change(sk);
1921 /* called if the other communication side shuts down its RECV direction;
1922 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1924 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1926 struct sock *sk = path->private;
1929 if (sk->sk_state != IUCV_CLOSED) {
1930 sk->sk_shutdown |= SEND_SHUTDOWN;
1931 sk->sk_state_change(sk);
1936 /***************** HiperSockets transport callbacks ********************/
1937 static void afiucv_swap_src_dest(struct sk_buff *skb)
1939 struct af_iucv_trans_hdr *trans_hdr =
1940 (struct af_iucv_trans_hdr *)skb->data;
1944 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1945 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1946 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1947 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1948 memcpy(tmpID, trans_hdr->srcUserID, 8);
1949 memcpy(tmpName, trans_hdr->srcAppName, 8);
1950 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1951 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1952 memcpy(trans_hdr->destUserID, tmpID, 8);
1953 memcpy(trans_hdr->destAppName, tmpName, 8);
1954 skb_push(skb, ETH_HLEN);
1955 memset(skb->data, 0, ETH_HLEN);
1959 * afiucv_hs_callback_syn - react on received SYN
1961 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1964 struct iucv_sock *iucv, *niucv;
1965 struct af_iucv_trans_hdr *trans_hdr;
1969 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1971 /* no sock - connection refused */
1972 afiucv_swap_src_dest(skb);
1973 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1974 err = dev_queue_xmit(skb);
1978 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1980 if ((sk->sk_state != IUCV_LISTEN) ||
1981 sk_acceptq_is_full(sk) ||
1983 /* error on server socket - connection refused */
1984 afiucv_swap_src_dest(skb);
1985 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1986 err = dev_queue_xmit(skb);
1987 iucv_sock_kill(nsk);
1992 niucv = iucv_sk(nsk);
1993 iucv_sock_init(nsk, sk);
1994 niucv->transport = AF_IUCV_TRANS_HIPER;
1995 niucv->msglimit = iucv->msglimit;
1996 if (!trans_hdr->window)
1997 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1999 niucv->msglimit_peer = trans_hdr->window;
2000 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
2001 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2002 memcpy(niucv->src_name, iucv->src_name, 8);
2003 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2004 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2005 niucv->hs_dev = iucv->hs_dev;
2006 dev_hold(niucv->hs_dev);
2007 afiucv_swap_src_dest(skb);
2008 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2009 trans_hdr->window = niucv->msglimit;
2010 /* if receiver acks the xmit connection is established */
2011 err = dev_queue_xmit(skb);
2013 iucv_accept_enqueue(sk, nsk);
2014 nsk->sk_state = IUCV_CONNECTED;
2015 sk->sk_data_ready(sk);
2017 iucv_sock_kill(nsk);
2021 return NET_RX_SUCCESS;
2025 * afiucv_hs_callback_synack() - react on received SYN-ACK
2027 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2029 struct iucv_sock *iucv = iucv_sk(sk);
2030 struct af_iucv_trans_hdr *trans_hdr =
2031 (struct af_iucv_trans_hdr *)skb->data;
2035 if (sk->sk_state != IUCV_BOUND)
2038 iucv->msglimit_peer = trans_hdr->window;
2039 sk->sk_state = IUCV_CONNECTED;
2040 sk->sk_state_change(sk);
2044 return NET_RX_SUCCESS;
2048 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2050 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2052 struct iucv_sock *iucv = iucv_sk(sk);
2056 if (sk->sk_state != IUCV_BOUND)
2059 sk->sk_state = IUCV_DISCONN;
2060 sk->sk_state_change(sk);
2064 return NET_RX_SUCCESS;
2068 * afiucv_hs_callback_fin() - react on received FIN
2070 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2072 struct iucv_sock *iucv = iucv_sk(sk);
2074 /* other end of connection closed */
2078 if (sk->sk_state == IUCV_CONNECTED) {
2079 sk->sk_state = IUCV_DISCONN;
2080 sk->sk_state_change(sk);
2085 return NET_RX_SUCCESS;
2089 * afiucv_hs_callback_win() - react on received WIN
2091 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2093 struct iucv_sock *iucv = iucv_sk(sk);
2094 struct af_iucv_trans_hdr *trans_hdr =
2095 (struct af_iucv_trans_hdr *)skb->data;
2098 return NET_RX_SUCCESS;
2100 if (sk->sk_state != IUCV_CONNECTED)
2101 return NET_RX_SUCCESS;
2103 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2104 iucv_sock_wake_msglim(sk);
2105 return NET_RX_SUCCESS;
2109 * afiucv_hs_callback_rx() - react on received data
2111 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2113 struct iucv_sock *iucv = iucv_sk(sk);
2117 return NET_RX_SUCCESS;
2120 if (sk->sk_state != IUCV_CONNECTED) {
2122 return NET_RX_SUCCESS;
2125 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2127 return NET_RX_SUCCESS;
2130 /* write stuff from iucv_msg to skb cb */
2131 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2132 skb_reset_transport_header(skb);
2133 skb_reset_network_header(skb);
2134 IUCV_SKB_CB(skb)->offset = 0;
2135 if (sk_filter(sk, skb)) {
2136 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2138 return NET_RX_SUCCESS;
2141 spin_lock(&iucv->message_q.lock);
2142 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2143 if (__sock_queue_rcv_skb(sk, skb))
2144 /* handle rcv queue full */
2145 skb_queue_tail(&iucv->backlog_skb_q, skb);
2147 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2148 spin_unlock(&iucv->message_q.lock);
2149 return NET_RX_SUCCESS;
2153 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2155 * called from netif RX softirq
2157 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2158 struct packet_type *pt, struct net_device *orig_dev)
2161 struct iucv_sock *iucv;
2162 struct af_iucv_trans_hdr *trans_hdr;
2166 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2167 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2169 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2171 return NET_RX_SUCCESS;
2173 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2174 if (skb_linearize(skb)) {
2175 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2178 return NET_RX_SUCCESS;
2180 skb_pull(skb, ETH_HLEN);
2181 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2182 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2183 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2184 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2185 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2186 memset(nullstring, 0, sizeof(nullstring));
2189 read_lock(&iucv_sk_list.lock);
2190 sk_for_each(sk, &iucv_sk_list.head) {
2191 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2192 if ((!memcmp(&iucv_sk(sk)->src_name,
2193 trans_hdr->destAppName, 8)) &&
2194 (!memcmp(&iucv_sk(sk)->src_user_id,
2195 trans_hdr->destUserID, 8)) &&
2196 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2197 (!memcmp(&iucv_sk(sk)->dst_user_id,
2203 if ((!memcmp(&iucv_sk(sk)->src_name,
2204 trans_hdr->destAppName, 8)) &&
2205 (!memcmp(&iucv_sk(sk)->src_user_id,
2206 trans_hdr->destUserID, 8)) &&
2207 (!memcmp(&iucv_sk(sk)->dst_name,
2208 trans_hdr->srcAppName, 8)) &&
2209 (!memcmp(&iucv_sk(sk)->dst_user_id,
2210 trans_hdr->srcUserID, 8))) {
2216 read_unlock(&iucv_sk_list.lock);
2221 how should we send with no sock
2222 1) send without sock no send rc checking?
2223 2) introduce default sock to handle this cases
2225 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2227 SYN|ACK, SYN|FIN, FIN -> no action? */
2229 switch (trans_hdr->flags) {
2230 case AF_IUCV_FLAG_SYN:
2231 /* connect request */
2232 err = afiucv_hs_callback_syn(sk, skb);
2234 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2235 /* connect request confirmed */
2236 err = afiucv_hs_callback_synack(sk, skb);
2238 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2239 /* connect request refused */
2240 err = afiucv_hs_callback_synfin(sk, skb);
2242 case (AF_IUCV_FLAG_FIN):
2244 err = afiucv_hs_callback_fin(sk, skb);
2246 case (AF_IUCV_FLAG_WIN):
2247 err = afiucv_hs_callback_win(sk, skb);
2248 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2252 /* fall through and receive non-zero length data */
2253 case (AF_IUCV_FLAG_SHT):
2254 /* shutdown request */
2255 /* fall through and receive zero length data */
2257 /* plain data frame */
2258 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2259 err = afiucv_hs_callback_rx(sk, skb);
2269 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2272 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2273 enum iucv_tx_notify n)
2275 struct sock *isk = skb->sk;
2276 struct sock *sk = NULL;
2277 struct iucv_sock *iucv = NULL;
2278 struct sk_buff_head *list;
2279 struct sk_buff *list_skb;
2280 struct sk_buff *nskb;
2281 unsigned long flags;
2283 read_lock_irqsave(&iucv_sk_list.lock, flags);
2284 sk_for_each(sk, &iucv_sk_list.head)
2289 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2291 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2294 list = &iucv->send_skb_q;
2295 spin_lock_irqsave(&list->lock, flags);
2296 if (skb_queue_empty(list))
2298 list_skb = list->next;
2299 nskb = list_skb->next;
2300 while (list_skb != (struct sk_buff *)list) {
2301 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2304 __skb_unlink(list_skb, list);
2305 kfree_skb(list_skb);
2306 iucv_sock_wake_msglim(sk);
2308 case TX_NOTIFY_PENDING:
2309 atomic_inc(&iucv->pendings);
2311 case TX_NOTIFY_DELAYED_OK:
2312 __skb_unlink(list_skb, list);
2313 atomic_dec(&iucv->pendings);
2314 if (atomic_read(&iucv->pendings) <= 0)
2315 iucv_sock_wake_msglim(sk);
2316 kfree_skb(list_skb);
2318 case TX_NOTIFY_UNREACHABLE:
2319 case TX_NOTIFY_DELAYED_UNREACHABLE:
2320 case TX_NOTIFY_TPQFULL: /* not yet used */
2321 case TX_NOTIFY_GENERALERROR:
2322 case TX_NOTIFY_DELAYED_GENERALERROR:
2323 __skb_unlink(list_skb, list);
2324 kfree_skb(list_skb);
2325 if (sk->sk_state == IUCV_CONNECTED) {
2326 sk->sk_state = IUCV_DISCONN;
2327 sk->sk_state_change(sk);
2337 spin_unlock_irqrestore(&list->lock, flags);
2339 if (sk->sk_state == IUCV_CLOSING) {
2340 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2341 sk->sk_state = IUCV_CLOSED;
2342 sk->sk_state_change(sk);
2349 * afiucv_netdev_event: handle netdev notifier chain events
2351 static int afiucv_netdev_event(struct notifier_block *this,
2352 unsigned long event, void *ptr)
2354 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2356 struct iucv_sock *iucv;
2360 case NETDEV_GOING_DOWN:
2361 sk_for_each(sk, &iucv_sk_list.head) {
2363 if ((iucv->hs_dev == event_dev) &&
2364 (sk->sk_state == IUCV_CONNECTED)) {
2365 if (event == NETDEV_GOING_DOWN)
2366 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2367 sk->sk_state = IUCV_DISCONN;
2368 sk->sk_state_change(sk);
2373 case NETDEV_UNREGISTER:
2380 static struct notifier_block afiucv_netdev_notifier = {
2381 .notifier_call = afiucv_netdev_event,
2384 static const struct proto_ops iucv_sock_ops = {
2386 .owner = THIS_MODULE,
2387 .release = iucv_sock_release,
2388 .bind = iucv_sock_bind,
2389 .connect = iucv_sock_connect,
2390 .listen = iucv_sock_listen,
2391 .accept = iucv_sock_accept,
2392 .getname = iucv_sock_getname,
2393 .sendmsg = iucv_sock_sendmsg,
2394 .recvmsg = iucv_sock_recvmsg,
2395 .poll = iucv_sock_poll,
2396 .ioctl = sock_no_ioctl,
2397 .mmap = sock_no_mmap,
2398 .socketpair = sock_no_socketpair,
2399 .shutdown = iucv_sock_shutdown,
2400 .setsockopt = iucv_sock_setsockopt,
2401 .getsockopt = iucv_sock_getsockopt,
2404 static const struct net_proto_family iucv_sock_family_ops = {
2406 .owner = THIS_MODULE,
2407 .create = iucv_sock_create,
2410 static struct packet_type iucv_packet_type = {
2411 .type = cpu_to_be16(ETH_P_AF_IUCV),
2412 .func = afiucv_hs_rcv,
2415 static int afiucv_iucv_init(void)
2419 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2422 /* establish dummy device */
2423 af_iucv_driver.bus = pr_iucv->bus;
2424 err = driver_register(&af_iucv_driver);
2427 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2432 dev_set_name(af_iucv_dev, "af_iucv");
2433 af_iucv_dev->bus = pr_iucv->bus;
2434 af_iucv_dev->parent = pr_iucv->root;
2435 af_iucv_dev->release = (void (*)(struct device *))kfree;
2436 af_iucv_dev->driver = &af_iucv_driver;
2437 err = device_register(af_iucv_dev);
2443 driver_unregister(&af_iucv_driver);
2445 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2450 static int __init afiucv_init(void)
2454 if (MACHINE_IS_VM) {
2455 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2456 if (unlikely(err)) {
2458 err = -EPROTONOSUPPORT;
2462 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2464 printk(KERN_WARNING "iucv_if lookup failed\n");
2465 memset(&iucv_userid, 0, sizeof(iucv_userid));
2468 memset(&iucv_userid, 0, sizeof(iucv_userid));
2472 err = proto_register(&iucv_proto, 0);
2475 err = sock_register(&iucv_sock_family_ops);
2480 err = afiucv_iucv_init();
2484 register_netdevice_notifier(&afiucv_netdev_notifier);
2485 dev_add_pack(&iucv_packet_type);
2489 sock_unregister(PF_IUCV);
2491 proto_unregister(&iucv_proto);
2494 symbol_put(iucv_if);
2498 static void __exit afiucv_exit(void)
2501 device_unregister(af_iucv_dev);
2502 driver_unregister(&af_iucv_driver);
2503 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2504 symbol_put(iucv_if);
2506 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2507 dev_remove_pack(&iucv_packet_type);
2508 sock_unregister(PF_IUCV);
2509 proto_unregister(&iucv_proto);
2512 module_init(afiucv_init);
2513 module_exit(afiucv_exit);
2515 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2516 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2517 MODULE_VERSION(VERSION);
2518 MODULE_LICENSE("GPL");
2519 MODULE_ALIAS_NETPROTO(PF_IUCV);