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 FIN through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 skb = sock_alloc_send_skb(sk, blen, 1, &err);
466 skb_reserve(skb, blen);
467 err = afiucv_hs_send(NULL, sk, skb, flags);
472 /* Close an IUCV socket */
473 static void iucv_sock_close(struct sock *sk)
475 struct iucv_sock *iucv = iucv_sk(sk);
481 switch (sk->sk_state) {
483 iucv_sock_cleanup_listen(sk);
487 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
489 sk->sk_state = IUCV_DISCONN;
490 sk->sk_state_change(sk);
492 case IUCV_DISCONN: /* fall through */
493 sk->sk_state = IUCV_CLOSING;
494 sk->sk_state_change(sk);
496 if (!err && !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);
510 sk->sk_err = ECONNRESET;
511 sk->sk_state_change(sk);
513 skb_queue_purge(&iucv->send_skb_q);
514 skb_queue_purge(&iucv->backlog_skb_q);
516 default: /* fall through */
517 iucv_sever_path(sk, 1);
521 dev_put(iucv->hs_dev);
523 sk->sk_bound_dev_if = 0;
526 /* mark socket for deletion by iucv_sock_kill() */
527 sock_set_flag(sk, SOCK_ZAPPED);
532 static void iucv_sock_init(struct sock *sk, struct sock *parent)
535 sk->sk_type = parent->sk_type;
536 security_sk_clone(parent, sk);
540 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
543 struct iucv_sock *iucv;
545 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
550 sock_init_data(sock, sk);
551 INIT_LIST_HEAD(&iucv->accept_q);
552 spin_lock_init(&iucv->accept_q_lock);
553 skb_queue_head_init(&iucv->send_skb_q);
554 INIT_LIST_HEAD(&iucv->message_q.list);
555 spin_lock_init(&iucv->message_q.lock);
556 skb_queue_head_init(&iucv->backlog_skb_q);
558 atomic_set(&iucv->pendings, 0);
561 atomic_set(&iucv->msg_sent, 0);
562 atomic_set(&iucv->msg_recv, 0);
564 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
565 memset(&iucv->src_user_id , 0, 32);
567 iucv->transport = AF_IUCV_TRANS_IUCV;
569 iucv->transport = AF_IUCV_TRANS_HIPER;
571 sk->sk_destruct = iucv_sock_destruct;
572 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
573 sk->sk_allocation = GFP_DMA;
575 sock_reset_flag(sk, SOCK_ZAPPED);
577 sk->sk_protocol = proto;
578 sk->sk_state = IUCV_OPEN;
580 iucv_sock_link(&iucv_sk_list, sk);
584 /* Create an IUCV socket */
585 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
590 if (protocol && protocol != PF_IUCV)
591 return -EPROTONOSUPPORT;
593 sock->state = SS_UNCONNECTED;
595 switch (sock->type) {
597 sock->ops = &iucv_sock_ops;
600 /* currently, proto ops can handle both sk types */
601 sock->ops = &iucv_sock_ops;
604 return -ESOCKTNOSUPPORT;
607 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
611 iucv_sock_init(sk, NULL);
616 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
618 write_lock_bh(&l->lock);
619 sk_add_node(sk, &l->head);
620 write_unlock_bh(&l->lock);
623 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
625 write_lock_bh(&l->lock);
626 sk_del_node_init(sk);
627 write_unlock_bh(&l->lock);
630 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
633 struct iucv_sock *par = iucv_sk(parent);
636 spin_lock_irqsave(&par->accept_q_lock, flags);
637 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
638 spin_unlock_irqrestore(&par->accept_q_lock, flags);
639 iucv_sk(sk)->parent = parent;
640 sk_acceptq_added(parent);
643 void iucv_accept_unlink(struct sock *sk)
646 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
648 spin_lock_irqsave(&par->accept_q_lock, flags);
649 list_del_init(&iucv_sk(sk)->accept_q);
650 spin_unlock_irqrestore(&par->accept_q_lock, flags);
651 sk_acceptq_removed(iucv_sk(sk)->parent);
652 iucv_sk(sk)->parent = NULL;
656 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
658 struct iucv_sock *isk, *n;
661 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
662 sk = (struct sock *) isk;
665 if (sk->sk_state == IUCV_CLOSED) {
666 iucv_accept_unlink(sk);
671 if (sk->sk_state == IUCV_CONNECTED ||
672 sk->sk_state == IUCV_DISCONN ||
674 iucv_accept_unlink(sk);
676 sock_graft(sk, newsock);
687 static void __iucv_auto_name(struct iucv_sock *iucv)
691 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
692 while (__iucv_get_sock_by_name(name)) {
693 sprintf(name, "%08x",
694 atomic_inc_return(&iucv_sk_list.autobind_name));
696 memcpy(iucv->src_name, name, 8);
699 /* Bind an unbound socket */
700 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
703 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
704 struct sock *sk = sock->sk;
705 struct iucv_sock *iucv;
707 struct net_device *dev;
710 /* Verify the input sockaddr */
711 if (!addr || addr->sa_family != AF_IUCV)
714 if (addr_len < sizeof(struct sockaddr_iucv))
718 if (sk->sk_state != IUCV_OPEN) {
723 write_lock_bh(&iucv_sk_list.lock);
726 if (__iucv_get_sock_by_name(sa->siucv_name)) {
733 /* Bind the socket */
735 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
736 goto vm_bind; /* VM IUCV transport */
738 /* try hiper transport */
739 memcpy(uid, sa->siucv_user_id, sizeof(uid));
742 for_each_netdev_rcu(&init_net, dev) {
743 if (!memcmp(dev->perm_addr, uid, 8)) {
744 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
745 /* Check for unitialized siucv_name */
746 if (strncmp(sa->siucv_name, " ", 8) == 0)
747 __iucv_auto_name(iucv);
749 memcpy(iucv->src_name, sa->siucv_name, 8);
750 sk->sk_bound_dev_if = dev->ifindex;
753 sk->sk_state = IUCV_BOUND;
754 iucv->transport = AF_IUCV_TRANS_HIPER;
756 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
764 /* use local userid for backward compat */
765 memcpy(iucv->src_name, sa->siucv_name, 8);
766 memcpy(iucv->src_user_id, iucv_userid, 8);
767 sk->sk_state = IUCV_BOUND;
768 iucv->transport = AF_IUCV_TRANS_IUCV;
770 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
773 /* found no dev to bind */
776 /* Release the socket list lock */
777 write_unlock_bh(&iucv_sk_list.lock);
783 /* Automatically bind an unbound socket */
784 static int iucv_sock_autobind(struct sock *sk)
786 struct iucv_sock *iucv = iucv_sk(sk);
789 if (unlikely(!pr_iucv))
792 memcpy(iucv->src_user_id, iucv_userid, 8);
794 write_lock_bh(&iucv_sk_list.lock);
795 __iucv_auto_name(iucv);
796 write_unlock_bh(&iucv_sk_list.lock);
799 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
804 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
806 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
807 struct sock *sk = sock->sk;
808 struct iucv_sock *iucv = iucv_sk(sk);
809 unsigned char user_data[16];
812 high_nmcpy(user_data, sa->siucv_name);
813 low_nmcpy(user_data, iucv->src_name);
814 ASCEBC(user_data, sizeof(user_data));
817 iucv->path = iucv_path_alloc(iucv->msglimit,
818 IUCV_IPRMDATA, GFP_KERNEL);
823 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
824 sa->siucv_user_id, NULL, user_data,
827 iucv_path_free(iucv->path);
830 case 0x0b: /* Target communicator is not logged on */
833 case 0x0d: /* Max connections for this guest exceeded */
834 case 0x0e: /* Max connections for target guest exceeded */
837 case 0x0f: /* Missing IUCV authorization */
849 /* Connect an unconnected socket */
850 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
853 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
854 struct sock *sk = sock->sk;
855 struct iucv_sock *iucv = iucv_sk(sk);
858 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
861 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
864 if (sk->sk_state == IUCV_OPEN &&
865 iucv->transport == AF_IUCV_TRANS_HIPER)
866 return -EBADFD; /* explicit bind required */
868 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
871 if (sk->sk_state == IUCV_OPEN) {
872 err = iucv_sock_autobind(sk);
879 /* Set the destination information */
880 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
881 memcpy(iucv->dst_name, sa->siucv_name, 8);
883 if (iucv->transport == AF_IUCV_TRANS_HIPER)
884 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
886 err = afiucv_path_connect(sock, addr);
890 if (sk->sk_state != IUCV_CONNECTED)
891 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
893 sock_sndtimeo(sk, flags & O_NONBLOCK));
895 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
898 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
899 iucv_sever_path(sk, 0);
906 /* Move a socket into listening state. */
907 static int iucv_sock_listen(struct socket *sock, int backlog)
909 struct sock *sk = sock->sk;
915 if (sk->sk_state != IUCV_BOUND)
918 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
921 sk->sk_max_ack_backlog = backlog;
922 sk->sk_ack_backlog = 0;
923 sk->sk_state = IUCV_LISTEN;
931 /* Accept a pending connection */
932 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
935 DECLARE_WAITQUEUE(wait, current);
936 struct sock *sk = sock->sk, *nsk;
940 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
942 if (sk->sk_state != IUCV_LISTEN) {
947 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
949 /* Wait for an incoming connection */
950 add_wait_queue_exclusive(sk_sleep(sk), &wait);
951 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
952 set_current_state(TASK_INTERRUPTIBLE);
959 timeo = schedule_timeout(timeo);
960 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
962 if (sk->sk_state != IUCV_LISTEN) {
967 if (signal_pending(current)) {
968 err = sock_intr_errno(timeo);
973 set_current_state(TASK_RUNNING);
974 remove_wait_queue(sk_sleep(sk), &wait);
979 newsock->state = SS_CONNECTED;
986 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
989 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
990 struct sock *sk = sock->sk;
991 struct iucv_sock *iucv = iucv_sk(sk);
993 addr->sa_family = AF_IUCV;
994 *len = sizeof(struct sockaddr_iucv);
997 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
998 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1000 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1001 memcpy(siucv->siucv_name, iucv->src_name, 8);
1003 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1004 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1005 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1011 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1013 * @msg: Pointer to a struct iucv_message
1014 * @skb: The socket data to send, skb->len MUST BE <= 7
1016 * Send the socket data in the parameter list in the iucv message
1017 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1018 * list and the socket data len at index 7 (last byte).
1019 * See also iucv_msg_length().
1021 * Returns the error code from the iucv_message_send() call.
1023 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1024 struct sk_buff *skb)
1028 memcpy(prmdata, (void *) skb->data, skb->len);
1029 prmdata[7] = 0xff - (u8) skb->len;
1030 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1031 (void *) prmdata, 8);
1034 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1037 struct sock *sk = sock->sk;
1038 struct iucv_sock *iucv = iucv_sk(sk);
1039 size_t headroom = 0;
1041 struct sk_buff *skb;
1042 struct iucv_message txmsg = {0};
1043 struct cmsghdr *cmsg;
1049 int noblock = msg->msg_flags & MSG_DONTWAIT;
1051 err = sock_error(sk);
1055 if (msg->msg_flags & MSG_OOB)
1058 /* SOCK_SEQPACKET: we do not support segmented records */
1059 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1064 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1069 /* Return if the socket is not in connected state */
1070 if (sk->sk_state != IUCV_CONNECTED) {
1075 /* initialize defaults */
1076 cmsg_done = 0; /* check for duplicate headers */
1079 /* iterate over control messages */
1080 for_each_cmsghdr(cmsg, msg) {
1081 if (!CMSG_OK(msg, cmsg)) {
1086 if (cmsg->cmsg_level != SOL_IUCV)
1089 if (cmsg->cmsg_type & cmsg_done) {
1093 cmsg_done |= cmsg->cmsg_type;
1095 switch (cmsg->cmsg_type) {
1096 case SCM_IUCV_TRGCLS:
1097 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1102 /* set iucv message target class */
1103 memcpy(&txmsg.class,
1104 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1114 /* allocate one skb for each iucv message:
1115 * this is fine for SOCK_SEQPACKET (unless we want to support
1116 * segmented records using the MSG_EOR flag), but
1117 * for SOCK_STREAM we might want to improve it in future */
1118 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1119 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1122 if (len < PAGE_SIZE) {
1125 /* In nonlinear "classic" iucv skb,
1126 * reserve space for iucv_array
1128 headroom = sizeof(struct iucv_array) *
1129 (MAX_SKB_FRAGS + 1);
1130 linear = PAGE_SIZE - headroom;
1133 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1138 skb_reserve(skb, headroom);
1139 skb_put(skb, linear);
1141 skb->data_len = len - linear;
1142 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1146 /* wait if outstanding messages for iucv path has reached */
1147 timeo = sock_sndtimeo(sk, noblock);
1148 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1152 /* return -ECONNRESET if the socket is no longer connected */
1153 if (sk->sk_state != IUCV_CONNECTED) {
1158 /* increment and save iucv message tag for msg_completion cbk */
1159 txmsg.tag = iucv->send_tag++;
1160 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1162 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1163 atomic_inc(&iucv->msg_sent);
1164 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1166 atomic_dec(&iucv->msg_sent);
1169 } else { /* Classic VM IUCV transport */
1170 skb_queue_tail(&iucv->send_skb_q, skb);
1172 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1174 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1176 /* on success: there is no message_complete callback */
1177 /* for an IPRMDATA msg; remove skb from send queue */
1179 skb_unlink(skb, &iucv->send_skb_q);
1183 /* this error should never happen since the */
1184 /* IUCV_IPRMDATA path flag is set... sever path */
1186 pr_iucv->path_sever(iucv->path, NULL);
1187 skb_unlink(skb, &iucv->send_skb_q);
1191 } else if (skb_is_nonlinear(skb)) {
1192 struct iucv_array *iba = (struct iucv_array *)skb->head;
1195 /* skip iucv_array lying in the headroom */
1196 iba[0].address = (u32)(addr_t)skb->data;
1197 iba[0].length = (u32)skb_headlen(skb);
1198 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1199 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1201 iba[i + 1].address =
1202 (u32)(addr_t)skb_frag_address(frag);
1203 iba[i + 1].length = (u32)skb_frag_size(frag);
1205 err = pr_iucv->message_send(iucv->path, &txmsg,
1207 (void *)iba, skb->len);
1208 } else { /* non-IPRM Linear skb */
1209 err = pr_iucv->message_send(iucv->path, &txmsg,
1210 0, 0, (void *)skb->data, skb->len);
1215 memcpy(user_id, iucv->dst_user_id, 8);
1217 memcpy(appl_id, iucv->dst_name, 8);
1219 "Application %s on z/VM guest %s exceeds message limit\n",
1225 skb_unlink(skb, &iucv->send_skb_q);
1240 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1242 size_t headroom, linear;
1243 struct sk_buff *skb;
1246 if (len < PAGE_SIZE) {
1250 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1251 linear = PAGE_SIZE - headroom;
1253 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1254 0, &err, GFP_ATOMIC | GFP_DMA);
1256 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1260 skb_reserve(skb, headroom);
1261 skb_put(skb, linear);
1263 skb->data_len = len - linear;
1268 /* iucv_process_message() - Receive a single outstanding IUCV message
1270 * Locking: must be called with message_q.lock held
1272 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1273 struct iucv_path *path,
1274 struct iucv_message *msg)
1279 len = iucv_msg_length(msg);
1281 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1282 /* Note: the first 4 bytes are reserved for msg tag */
1283 IUCV_SKB_CB(skb)->class = msg->class;
1285 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1286 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1287 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1292 if (skb_is_nonlinear(skb)) {
1293 struct iucv_array *iba = (struct iucv_array *)skb->head;
1296 iba[0].address = (u32)(addr_t)skb->data;
1297 iba[0].length = (u32)skb_headlen(skb);
1298 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1299 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1301 iba[i + 1].address =
1302 (u32)(addr_t)skb_frag_address(frag);
1303 iba[i + 1].length = (u32)skb_frag_size(frag);
1305 rc = pr_iucv->message_receive(path, msg,
1307 (void *)iba, len, NULL);
1309 rc = pr_iucv->message_receive(path, msg,
1310 msg->flags & IUCV_IPRMDATA,
1311 skb->data, len, NULL);
1317 WARN_ON_ONCE(skb->len != len);
1320 IUCV_SKB_CB(skb)->offset = 0;
1321 if (sock_queue_rcv_skb(sk, skb))
1322 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1325 /* iucv_process_message_q() - Process outstanding IUCV messages
1327 * Locking: must be called with message_q.lock held
1329 static void iucv_process_message_q(struct sock *sk)
1331 struct iucv_sock *iucv = iucv_sk(sk);
1332 struct sk_buff *skb;
1333 struct sock_msg_q *p, *n;
1335 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1336 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1339 iucv_process_message(sk, skb, p->path, &p->msg);
1342 if (!skb_queue_empty(&iucv->backlog_skb_q))
1347 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1348 size_t len, int flags)
1350 int noblock = flags & MSG_DONTWAIT;
1351 struct sock *sk = sock->sk;
1352 struct iucv_sock *iucv = iucv_sk(sk);
1353 unsigned int copied, rlen;
1354 struct sk_buff *skb, *rskb, *cskb;
1358 if ((sk->sk_state == IUCV_DISCONN) &&
1359 skb_queue_empty(&iucv->backlog_skb_q) &&
1360 skb_queue_empty(&sk->sk_receive_queue) &&
1361 list_empty(&iucv->message_q.list))
1364 if (flags & (MSG_OOB))
1367 /* receive/dequeue next skb:
1368 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1369 skb = skb_recv_datagram(sk, flags, noblock, &err);
1371 if (sk->sk_shutdown & RCV_SHUTDOWN)
1376 offset = IUCV_SKB_CB(skb)->offset;
1377 rlen = skb->len - offset; /* real length of skb */
1378 copied = min_t(unsigned int, rlen, len);
1380 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1383 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1384 if (!(flags & MSG_PEEK))
1385 skb_queue_head(&sk->sk_receive_queue, skb);
1389 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1390 if (sk->sk_type == SOCK_SEQPACKET) {
1392 msg->msg_flags |= MSG_TRUNC;
1393 /* each iucv message contains a complete record */
1394 msg->msg_flags |= MSG_EOR;
1397 /* create control message to store iucv msg target class:
1398 * get the trgcls from the control buffer of the skb due to
1399 * fragmentation of original iucv message. */
1400 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1401 sizeof(IUCV_SKB_CB(skb)->class),
1402 (void *)&IUCV_SKB_CB(skb)->class);
1404 if (!(flags & MSG_PEEK))
1405 skb_queue_head(&sk->sk_receive_queue, skb);
1409 /* Mark read part of skb as used */
1410 if (!(flags & MSG_PEEK)) {
1412 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1413 if (sk->sk_type == SOCK_STREAM) {
1414 if (copied < rlen) {
1415 IUCV_SKB_CB(skb)->offset = offset + copied;
1416 skb_queue_head(&sk->sk_receive_queue, skb);
1422 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1423 atomic_inc(&iucv->msg_recv);
1424 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1426 iucv_sock_close(sk);
1431 /* Queue backlog skbs */
1432 spin_lock_bh(&iucv->message_q.lock);
1433 rskb = skb_dequeue(&iucv->backlog_skb_q);
1435 IUCV_SKB_CB(rskb)->offset = 0;
1436 if (sock_queue_rcv_skb(sk, rskb)) {
1437 skb_queue_head(&iucv->backlog_skb_q,
1441 rskb = skb_dequeue(&iucv->backlog_skb_q);
1444 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1445 if (!list_empty(&iucv->message_q.list))
1446 iucv_process_message_q(sk);
1447 if (atomic_read(&iucv->msg_recv) >=
1448 iucv->msglimit / 2) {
1449 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1451 sk->sk_state = IUCV_DISCONN;
1452 sk->sk_state_change(sk);
1456 spin_unlock_bh(&iucv->message_q.lock);
1460 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1461 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1467 static inline unsigned int iucv_accept_poll(struct sock *parent)
1469 struct iucv_sock *isk, *n;
1472 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1473 sk = (struct sock *) isk;
1475 if (sk->sk_state == IUCV_CONNECTED)
1476 return POLLIN | POLLRDNORM;
1482 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1485 struct sock *sk = sock->sk;
1486 unsigned int mask = 0;
1488 sock_poll_wait(file, sk_sleep(sk), wait);
1490 if (sk->sk_state == IUCV_LISTEN)
1491 return iucv_accept_poll(sk);
1493 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1495 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1497 if (sk->sk_shutdown & RCV_SHUTDOWN)
1500 if (sk->sk_shutdown == SHUTDOWN_MASK)
1503 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1504 (sk->sk_shutdown & RCV_SHUTDOWN))
1505 mask |= POLLIN | POLLRDNORM;
1507 if (sk->sk_state == IUCV_CLOSED)
1510 if (sk->sk_state == IUCV_DISCONN)
1513 if (sock_writeable(sk) && iucv_below_msglim(sk))
1514 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1516 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1521 static int iucv_sock_shutdown(struct socket *sock, int how)
1523 struct sock *sk = sock->sk;
1524 struct iucv_sock *iucv = iucv_sk(sk);
1525 struct iucv_message txmsg;
1530 if ((how & ~SHUTDOWN_MASK) || !how)
1534 switch (sk->sk_state) {
1545 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) &&
1546 sk->sk_state == IUCV_CONNECTED) {
1547 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1550 err = pr_iucv->message_send(iucv->path, &txmsg,
1551 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1566 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1569 sk->sk_shutdown |= how;
1570 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1571 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1573 err = pr_iucv->path_quiesce(iucv->path, NULL);
1576 /* skb_queue_purge(&sk->sk_receive_queue); */
1578 skb_queue_purge(&sk->sk_receive_queue);
1581 /* Wake up anyone sleeping in poll */
1582 sk->sk_state_change(sk);
1589 static int iucv_sock_release(struct socket *sock)
1591 struct sock *sk = sock->sk;
1597 iucv_sock_close(sk);
1604 /* getsockopt and setsockopt */
1605 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1606 char __user *optval, unsigned int optlen)
1608 struct sock *sk = sock->sk;
1609 struct iucv_sock *iucv = iucv_sk(sk);
1613 if (level != SOL_IUCV)
1614 return -ENOPROTOOPT;
1616 if (optlen < sizeof(int))
1619 if (get_user(val, (int __user *) optval))
1626 case SO_IPRMDATA_MSG:
1628 iucv->flags |= IUCV_IPRMDATA;
1630 iucv->flags &= ~IUCV_IPRMDATA;
1633 switch (sk->sk_state) {
1636 if (val < 1 || val > (u16)(~0))
1639 iucv->msglimit = val;
1655 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1656 char __user *optval, int __user *optlen)
1658 struct sock *sk = sock->sk;
1659 struct iucv_sock *iucv = iucv_sk(sk);
1663 if (level != SOL_IUCV)
1664 return -ENOPROTOOPT;
1666 if (get_user(len, optlen))
1672 len = min_t(unsigned int, len, sizeof(int));
1675 case SO_IPRMDATA_MSG:
1676 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1680 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1681 : iucv->msglimit; /* default */
1685 if (sk->sk_state == IUCV_OPEN)
1687 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1688 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1692 return -ENOPROTOOPT;
1695 if (put_user(len, optlen))
1697 if (copy_to_user(optval, &val, len))
1704 /* Callback wrappers - called from iucv base support */
1705 static int iucv_callback_connreq(struct iucv_path *path,
1706 u8 ipvmid[8], u8 ipuser[16])
1708 unsigned char user_data[16];
1709 unsigned char nuser_data[16];
1710 unsigned char src_name[8];
1711 struct sock *sk, *nsk;
1712 struct iucv_sock *iucv, *niucv;
1715 memcpy(src_name, ipuser, 8);
1716 EBCASC(src_name, 8);
1717 /* Find out if this path belongs to af_iucv. */
1718 read_lock(&iucv_sk_list.lock);
1721 sk_for_each(sk, &iucv_sk_list.head)
1722 if (sk->sk_state == IUCV_LISTEN &&
1723 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1725 * Found a listening socket with
1726 * src_name == ipuser[0-7].
1731 read_unlock(&iucv_sk_list.lock);
1733 /* No socket found, not one of our paths. */
1738 /* Check if parent socket is listening */
1739 low_nmcpy(user_data, iucv->src_name);
1740 high_nmcpy(user_data, iucv->dst_name);
1741 ASCEBC(user_data, sizeof(user_data));
1742 if (sk->sk_state != IUCV_LISTEN) {
1743 err = pr_iucv->path_sever(path, user_data);
1744 iucv_path_free(path);
1748 /* Check for backlog size */
1749 if (sk_acceptq_is_full(sk)) {
1750 err = pr_iucv->path_sever(path, user_data);
1751 iucv_path_free(path);
1755 /* Create the new socket */
1756 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1758 err = pr_iucv->path_sever(path, user_data);
1759 iucv_path_free(path);
1763 niucv = iucv_sk(nsk);
1764 iucv_sock_init(nsk, sk);
1766 /* Set the new iucv_sock */
1767 memcpy(niucv->dst_name, ipuser + 8, 8);
1768 EBCASC(niucv->dst_name, 8);
1769 memcpy(niucv->dst_user_id, ipvmid, 8);
1770 memcpy(niucv->src_name, iucv->src_name, 8);
1771 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1774 /* Call iucv_accept */
1775 high_nmcpy(nuser_data, ipuser + 8);
1776 memcpy(nuser_data + 8, niucv->src_name, 8);
1777 ASCEBC(nuser_data + 8, 8);
1779 /* set message limit for path based on msglimit of accepting socket */
1780 niucv->msglimit = iucv->msglimit;
1781 path->msglim = iucv->msglimit;
1782 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1784 iucv_sever_path(nsk, 1);
1785 iucv_sock_kill(nsk);
1789 iucv_accept_enqueue(sk, nsk);
1791 /* Wake up accept */
1792 nsk->sk_state = IUCV_CONNECTED;
1793 sk->sk_data_ready(sk);
1800 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1802 struct sock *sk = path->private;
1804 sk->sk_state = IUCV_CONNECTED;
1805 sk->sk_state_change(sk);
1808 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1810 struct sock *sk = path->private;
1811 struct iucv_sock *iucv = iucv_sk(sk);
1812 struct sk_buff *skb;
1813 struct sock_msg_q *save_msg;
1816 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1817 pr_iucv->message_reject(path, msg);
1821 spin_lock(&iucv->message_q.lock);
1823 if (!list_empty(&iucv->message_q.list) ||
1824 !skb_queue_empty(&iucv->backlog_skb_q))
1827 len = atomic_read(&sk->sk_rmem_alloc);
1828 len += SKB_TRUESIZE(iucv_msg_length(msg));
1829 if (len > sk->sk_rcvbuf)
1832 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1836 iucv_process_message(sk, skb, path, msg);
1840 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1843 save_msg->path = path;
1844 save_msg->msg = *msg;
1846 list_add_tail(&save_msg->list, &iucv->message_q.list);
1849 spin_unlock(&iucv->message_q.lock);
1852 static void iucv_callback_txdone(struct iucv_path *path,
1853 struct iucv_message *msg)
1855 struct sock *sk = path->private;
1856 struct sk_buff *this = NULL;
1857 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1858 struct sk_buff *list_skb = list->next;
1859 unsigned long flags;
1862 if (!skb_queue_empty(list)) {
1863 spin_lock_irqsave(&list->lock, flags);
1865 while (list_skb != (struct sk_buff *)list) {
1866 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1870 list_skb = list_skb->next;
1873 __skb_unlink(this, list);
1875 spin_unlock_irqrestore(&list->lock, flags);
1879 /* wake up any process waiting for sending */
1880 iucv_sock_wake_msglim(sk);
1884 if (sk->sk_state == IUCV_CLOSING) {
1885 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1886 sk->sk_state = IUCV_CLOSED;
1887 sk->sk_state_change(sk);
1894 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1896 struct sock *sk = path->private;
1898 if (sk->sk_state == IUCV_CLOSED)
1902 iucv_sever_path(sk, 1);
1903 sk->sk_state = IUCV_DISCONN;
1905 sk->sk_state_change(sk);
1909 /* called if the other communication side shuts down its RECV direction;
1910 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1912 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1914 struct sock *sk = path->private;
1917 if (sk->sk_state != IUCV_CLOSED) {
1918 sk->sk_shutdown |= SEND_SHUTDOWN;
1919 sk->sk_state_change(sk);
1924 /***************** HiperSockets transport callbacks ********************/
1925 static void afiucv_swap_src_dest(struct sk_buff *skb)
1927 struct af_iucv_trans_hdr *trans_hdr =
1928 (struct af_iucv_trans_hdr *)skb->data;
1932 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1933 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1934 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1935 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1936 memcpy(tmpID, trans_hdr->srcUserID, 8);
1937 memcpy(tmpName, trans_hdr->srcAppName, 8);
1938 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1939 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1940 memcpy(trans_hdr->destUserID, tmpID, 8);
1941 memcpy(trans_hdr->destAppName, tmpName, 8);
1942 skb_push(skb, ETH_HLEN);
1943 memset(skb->data, 0, ETH_HLEN);
1947 * afiucv_hs_callback_syn - react on received SYN
1949 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1952 struct iucv_sock *iucv, *niucv;
1953 struct af_iucv_trans_hdr *trans_hdr;
1957 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1959 /* no sock - connection refused */
1960 afiucv_swap_src_dest(skb);
1961 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1962 err = dev_queue_xmit(skb);
1966 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1968 if ((sk->sk_state != IUCV_LISTEN) ||
1969 sk_acceptq_is_full(sk) ||
1971 /* error on server socket - 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);
1975 iucv_sock_kill(nsk);
1980 niucv = iucv_sk(nsk);
1981 iucv_sock_init(nsk, sk);
1982 niucv->transport = AF_IUCV_TRANS_HIPER;
1983 niucv->msglimit = iucv->msglimit;
1984 if (!trans_hdr->window)
1985 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1987 niucv->msglimit_peer = trans_hdr->window;
1988 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1989 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1990 memcpy(niucv->src_name, iucv->src_name, 8);
1991 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1992 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1993 niucv->hs_dev = iucv->hs_dev;
1994 dev_hold(niucv->hs_dev);
1995 afiucv_swap_src_dest(skb);
1996 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1997 trans_hdr->window = niucv->msglimit;
1998 /* if receiver acks the xmit connection is established */
1999 err = dev_queue_xmit(skb);
2001 iucv_accept_enqueue(sk, nsk);
2002 nsk->sk_state = IUCV_CONNECTED;
2003 sk->sk_data_ready(sk);
2005 iucv_sock_kill(nsk);
2009 return NET_RX_SUCCESS;
2013 * afiucv_hs_callback_synack() - react on received SYN-ACK
2015 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2017 struct iucv_sock *iucv = iucv_sk(sk);
2018 struct af_iucv_trans_hdr *trans_hdr =
2019 (struct af_iucv_trans_hdr *)skb->data;
2023 if (sk->sk_state != IUCV_BOUND)
2026 iucv->msglimit_peer = trans_hdr->window;
2027 sk->sk_state = IUCV_CONNECTED;
2028 sk->sk_state_change(sk);
2032 return NET_RX_SUCCESS;
2036 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2038 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2040 struct iucv_sock *iucv = iucv_sk(sk);
2044 if (sk->sk_state != IUCV_BOUND)
2047 sk->sk_state = IUCV_DISCONN;
2048 sk->sk_state_change(sk);
2052 return NET_RX_SUCCESS;
2056 * afiucv_hs_callback_fin() - react on received FIN
2058 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2060 struct iucv_sock *iucv = iucv_sk(sk);
2062 /* other end of connection closed */
2066 if (sk->sk_state == IUCV_CONNECTED) {
2067 sk->sk_state = IUCV_DISCONN;
2068 sk->sk_state_change(sk);
2073 return NET_RX_SUCCESS;
2077 * afiucv_hs_callback_win() - react on received WIN
2079 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2081 struct iucv_sock *iucv = iucv_sk(sk);
2082 struct af_iucv_trans_hdr *trans_hdr =
2083 (struct af_iucv_trans_hdr *)skb->data;
2086 return NET_RX_SUCCESS;
2088 if (sk->sk_state != IUCV_CONNECTED)
2089 return NET_RX_SUCCESS;
2091 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2092 iucv_sock_wake_msglim(sk);
2093 return NET_RX_SUCCESS;
2097 * afiucv_hs_callback_rx() - react on received data
2099 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2101 struct iucv_sock *iucv = iucv_sk(sk);
2105 return NET_RX_SUCCESS;
2108 if (sk->sk_state != IUCV_CONNECTED) {
2110 return NET_RX_SUCCESS;
2113 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2115 return NET_RX_SUCCESS;
2118 /* write stuff from iucv_msg to skb cb */
2119 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2120 skb_reset_transport_header(skb);
2121 skb_reset_network_header(skb);
2122 IUCV_SKB_CB(skb)->offset = 0;
2123 spin_lock(&iucv->message_q.lock);
2124 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2125 if (sock_queue_rcv_skb(sk, skb)) {
2126 /* handle rcv queue full */
2127 skb_queue_tail(&iucv->backlog_skb_q, skb);
2130 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2131 spin_unlock(&iucv->message_q.lock);
2132 return NET_RX_SUCCESS;
2136 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2138 * called from netif RX softirq
2140 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2141 struct packet_type *pt, struct net_device *orig_dev)
2144 struct iucv_sock *iucv;
2145 struct af_iucv_trans_hdr *trans_hdr;
2149 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2150 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2152 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2154 return NET_RX_SUCCESS;
2156 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2157 if (skb_linearize(skb)) {
2158 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2161 return NET_RX_SUCCESS;
2163 skb_pull(skb, ETH_HLEN);
2164 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2165 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2166 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2167 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2168 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2169 memset(nullstring, 0, sizeof(nullstring));
2172 read_lock(&iucv_sk_list.lock);
2173 sk_for_each(sk, &iucv_sk_list.head) {
2174 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2175 if ((!memcmp(&iucv_sk(sk)->src_name,
2176 trans_hdr->destAppName, 8)) &&
2177 (!memcmp(&iucv_sk(sk)->src_user_id,
2178 trans_hdr->destUserID, 8)) &&
2179 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2180 (!memcmp(&iucv_sk(sk)->dst_user_id,
2186 if ((!memcmp(&iucv_sk(sk)->src_name,
2187 trans_hdr->destAppName, 8)) &&
2188 (!memcmp(&iucv_sk(sk)->src_user_id,
2189 trans_hdr->destUserID, 8)) &&
2190 (!memcmp(&iucv_sk(sk)->dst_name,
2191 trans_hdr->srcAppName, 8)) &&
2192 (!memcmp(&iucv_sk(sk)->dst_user_id,
2193 trans_hdr->srcUserID, 8))) {
2199 read_unlock(&iucv_sk_list.lock);
2204 how should we send with no sock
2205 1) send without sock no send rc checking?
2206 2) introduce default sock to handle this cases
2208 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2210 SYN|ACK, SYN|FIN, FIN -> no action? */
2212 switch (trans_hdr->flags) {
2213 case AF_IUCV_FLAG_SYN:
2214 /* connect request */
2215 err = afiucv_hs_callback_syn(sk, skb);
2217 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2218 /* connect request confirmed */
2219 err = afiucv_hs_callback_synack(sk, skb);
2221 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2222 /* connect request refused */
2223 err = afiucv_hs_callback_synfin(sk, skb);
2225 case (AF_IUCV_FLAG_FIN):
2227 err = afiucv_hs_callback_fin(sk, skb);
2229 case (AF_IUCV_FLAG_WIN):
2230 err = afiucv_hs_callback_win(sk, skb);
2231 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2235 /* fall through and receive non-zero length data */
2236 case (AF_IUCV_FLAG_SHT):
2237 /* shutdown request */
2238 /* fall through and receive zero length data */
2240 /* plain data frame */
2241 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2242 err = afiucv_hs_callback_rx(sk, skb);
2252 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2255 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2256 enum iucv_tx_notify n)
2258 struct sock *isk = skb->sk;
2259 struct sock *sk = NULL;
2260 struct iucv_sock *iucv = NULL;
2261 struct sk_buff_head *list;
2262 struct sk_buff *list_skb;
2263 struct sk_buff *nskb;
2264 unsigned long flags;
2266 read_lock_irqsave(&iucv_sk_list.lock, flags);
2267 sk_for_each(sk, &iucv_sk_list.head)
2272 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2274 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2277 list = &iucv->send_skb_q;
2278 spin_lock_irqsave(&list->lock, flags);
2279 if (skb_queue_empty(list))
2281 list_skb = list->next;
2282 nskb = list_skb->next;
2283 while (list_skb != (struct sk_buff *)list) {
2284 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2287 __skb_unlink(list_skb, list);
2288 kfree_skb(list_skb);
2289 iucv_sock_wake_msglim(sk);
2291 case TX_NOTIFY_PENDING:
2292 atomic_inc(&iucv->pendings);
2294 case TX_NOTIFY_DELAYED_OK:
2295 __skb_unlink(list_skb, list);
2296 atomic_dec(&iucv->pendings);
2297 if (atomic_read(&iucv->pendings) <= 0)
2298 iucv_sock_wake_msglim(sk);
2299 kfree_skb(list_skb);
2301 case TX_NOTIFY_UNREACHABLE:
2302 case TX_NOTIFY_DELAYED_UNREACHABLE:
2303 case TX_NOTIFY_TPQFULL: /* not yet used */
2304 case TX_NOTIFY_GENERALERROR:
2305 case TX_NOTIFY_DELAYED_GENERALERROR:
2306 __skb_unlink(list_skb, list);
2307 kfree_skb(list_skb);
2308 if (sk->sk_state == IUCV_CONNECTED) {
2309 sk->sk_state = IUCV_DISCONN;
2310 sk->sk_state_change(sk);
2320 spin_unlock_irqrestore(&list->lock, flags);
2322 if (sk->sk_state == IUCV_CLOSING) {
2323 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2324 sk->sk_state = IUCV_CLOSED;
2325 sk->sk_state_change(sk);
2332 * afiucv_netdev_event: handle netdev notifier chain events
2334 static int afiucv_netdev_event(struct notifier_block *this,
2335 unsigned long event, void *ptr)
2337 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2339 struct iucv_sock *iucv;
2343 case NETDEV_GOING_DOWN:
2344 sk_for_each(sk, &iucv_sk_list.head) {
2346 if ((iucv->hs_dev == event_dev) &&
2347 (sk->sk_state == IUCV_CONNECTED)) {
2348 if (event == NETDEV_GOING_DOWN)
2349 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2350 sk->sk_state = IUCV_DISCONN;
2351 sk->sk_state_change(sk);
2356 case NETDEV_UNREGISTER:
2363 static struct notifier_block afiucv_netdev_notifier = {
2364 .notifier_call = afiucv_netdev_event,
2367 static const struct proto_ops iucv_sock_ops = {
2369 .owner = THIS_MODULE,
2370 .release = iucv_sock_release,
2371 .bind = iucv_sock_bind,
2372 .connect = iucv_sock_connect,
2373 .listen = iucv_sock_listen,
2374 .accept = iucv_sock_accept,
2375 .getname = iucv_sock_getname,
2376 .sendmsg = iucv_sock_sendmsg,
2377 .recvmsg = iucv_sock_recvmsg,
2378 .poll = iucv_sock_poll,
2379 .ioctl = sock_no_ioctl,
2380 .mmap = sock_no_mmap,
2381 .socketpair = sock_no_socketpair,
2382 .shutdown = iucv_sock_shutdown,
2383 .setsockopt = iucv_sock_setsockopt,
2384 .getsockopt = iucv_sock_getsockopt,
2387 static const struct net_proto_family iucv_sock_family_ops = {
2389 .owner = THIS_MODULE,
2390 .create = iucv_sock_create,
2393 static struct packet_type iucv_packet_type = {
2394 .type = cpu_to_be16(ETH_P_AF_IUCV),
2395 .func = afiucv_hs_rcv,
2398 static int afiucv_iucv_init(void)
2402 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2405 /* establish dummy device */
2406 af_iucv_driver.bus = pr_iucv->bus;
2407 err = driver_register(&af_iucv_driver);
2410 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2415 dev_set_name(af_iucv_dev, "af_iucv");
2416 af_iucv_dev->bus = pr_iucv->bus;
2417 af_iucv_dev->parent = pr_iucv->root;
2418 af_iucv_dev->release = (void (*)(struct device *))kfree;
2419 af_iucv_dev->driver = &af_iucv_driver;
2420 err = device_register(af_iucv_dev);
2426 put_device(af_iucv_dev);
2428 driver_unregister(&af_iucv_driver);
2430 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2435 static void afiucv_iucv_exit(void)
2437 device_unregister(af_iucv_dev);
2438 driver_unregister(&af_iucv_driver);
2439 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2442 static int __init afiucv_init(void)
2446 if (MACHINE_IS_VM) {
2447 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2448 if (unlikely(err)) {
2450 err = -EPROTONOSUPPORT;
2454 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2456 printk(KERN_WARNING "iucv_if lookup failed\n");
2457 memset(&iucv_userid, 0, sizeof(iucv_userid));
2460 memset(&iucv_userid, 0, sizeof(iucv_userid));
2464 err = proto_register(&iucv_proto, 0);
2467 err = sock_register(&iucv_sock_family_ops);
2472 err = afiucv_iucv_init();
2477 err = register_netdevice_notifier(&afiucv_netdev_notifier);
2481 dev_add_pack(&iucv_packet_type);
2488 sock_unregister(PF_IUCV);
2490 proto_unregister(&iucv_proto);
2493 symbol_put(iucv_if);
2497 static void __exit afiucv_exit(void)
2501 symbol_put(iucv_if);
2504 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2505 dev_remove_pack(&iucv_packet_type);
2506 sock_unregister(PF_IUCV);
2507 proto_unregister(&iucv_proto);
2510 module_init(afiucv_init);
2511 module_exit(afiucv_exit);
2513 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2514 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2515 MODULE_VERSION(VERSION);
2516 MODULE_LICENSE("GPL");
2517 MODULE_ALIAS_NETPROTO(PF_IUCV);