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/signal.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 = skb_push(skb, sizeof(struct af_iucv_trans_hdr));
326 skb_reset_mac_header(skb);
327 skb_reset_network_header(skb);
328 skb_push(skb, ETH_HLEN);
329 skb_reset_mac_header(skb);
330 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332 phs_hdr->magic = ETH_P_AF_IUCV;
333 phs_hdr->version = 1;
334 phs_hdr->flags = flags;
335 if (flags == AF_IUCV_FLAG_SYN)
336 phs_hdr->window = iucv->msglimit;
337 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
338 confirm_recv = atomic_read(&iucv->msg_recv);
339 phs_hdr->window = confirm_recv;
341 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
344 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
345 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
346 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
347 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
348 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
349 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
350 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354 skb->dev = iucv->hs_dev;
357 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
359 if (skb->len > skb->dev->mtu) {
360 if (sock->sk_type == SOCK_SEQPACKET)
363 skb_trim(skb, skb->dev->mtu);
365 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
366 nskb = skb_clone(skb, GFP_ATOMIC);
369 skb_queue_tail(&iucv->send_skb_q, nskb);
370 err = dev_queue_xmit(skb);
371 if (net_xmit_eval(err)) {
372 skb_unlink(nskb, &iucv->send_skb_q);
375 atomic_sub(confirm_recv, &iucv->msg_recv);
376 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 return net_xmit_eval(err);
381 static struct sock *__iucv_get_sock_by_name(char *nm)
385 sk_for_each(sk, &iucv_sk_list.head)
386 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
392 static void iucv_sock_destruct(struct sock *sk)
394 skb_queue_purge(&sk->sk_receive_queue);
395 skb_queue_purge(&sk->sk_error_queue);
399 if (!sock_flag(sk, SOCK_DEAD)) {
400 pr_err("Attempt to release alive iucv socket %p\n", sk);
404 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
405 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
406 WARN_ON(sk->sk_wmem_queued);
407 WARN_ON(sk->sk_forward_alloc);
411 static void iucv_sock_cleanup_listen(struct sock *parent)
415 /* Close non-accepted connections */
416 while ((sk = iucv_accept_dequeue(parent, NULL))) {
421 parent->sk_state = IUCV_CLOSED;
424 /* Kill socket (only if zapped and orphaned) */
425 static void iucv_sock_kill(struct sock *sk)
427 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
430 iucv_sock_unlink(&iucv_sk_list, sk);
431 sock_set_flag(sk, SOCK_DEAD);
435 /* Terminate an IUCV path */
436 static void iucv_sever_path(struct sock *sk, int with_user_data)
438 unsigned char user_data[16];
439 struct iucv_sock *iucv = iucv_sk(sk);
440 struct iucv_path *path = iucv->path;
444 if (with_user_data) {
445 low_nmcpy(user_data, iucv->src_name);
446 high_nmcpy(user_data, iucv->dst_name);
447 ASCEBC(user_data, sizeof(user_data));
448 pr_iucv->path_sever(path, user_data);
450 pr_iucv->path_sever(path, NULL);
451 iucv_path_free(path);
455 /* Send controlling flags through an IUCV socket for HIPER transport */
456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 if (sk->sk_shutdown & SEND_SHUTDOWN) {
465 /* controlling flags should be sent anyway */
466 shutdown = sk->sk_shutdown;
467 sk->sk_shutdown &= RCV_SHUTDOWN;
469 skb = sock_alloc_send_skb(sk, blen, 1, &err);
471 skb_reserve(skb, blen);
472 err = afiucv_hs_send(NULL, sk, skb, flags);
475 sk->sk_shutdown = shutdown;
479 /* Close an IUCV socket */
480 static void iucv_sock_close(struct sock *sk)
482 struct iucv_sock *iucv = iucv_sk(sk);
488 switch (sk->sk_state) {
490 iucv_sock_cleanup_listen(sk);
494 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
495 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
496 sk->sk_state = IUCV_DISCONN;
497 sk->sk_state_change(sk);
499 case IUCV_DISCONN: /* fall through */
500 sk->sk_state = IUCV_CLOSING;
501 sk->sk_state_change(sk);
503 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
504 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
505 timeo = sk->sk_lingertime;
507 timeo = IUCV_DISCONN_TIMEOUT;
509 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
513 case IUCV_CLOSING: /* fall through */
514 sk->sk_state = IUCV_CLOSED;
515 sk->sk_state_change(sk);
517 sk->sk_err = ECONNRESET;
518 sk->sk_state_change(sk);
520 skb_queue_purge(&iucv->send_skb_q);
521 skb_queue_purge(&iucv->backlog_skb_q);
523 default: /* fall through */
524 iucv_sever_path(sk, 1);
528 dev_put(iucv->hs_dev);
530 sk->sk_bound_dev_if = 0;
533 /* mark socket for deletion by iucv_sock_kill() */
534 sock_set_flag(sk, SOCK_ZAPPED);
539 static void iucv_sock_init(struct sock *sk, struct sock *parent)
542 sk->sk_type = parent->sk_type;
543 security_sk_clone(parent, sk);
547 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
550 struct iucv_sock *iucv;
552 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
557 sock_init_data(sock, sk);
558 INIT_LIST_HEAD(&iucv->accept_q);
559 spin_lock_init(&iucv->accept_q_lock);
560 skb_queue_head_init(&iucv->send_skb_q);
561 INIT_LIST_HEAD(&iucv->message_q.list);
562 spin_lock_init(&iucv->message_q.lock);
563 skb_queue_head_init(&iucv->backlog_skb_q);
565 atomic_set(&iucv->pendings, 0);
568 atomic_set(&iucv->msg_sent, 0);
569 atomic_set(&iucv->msg_recv, 0);
571 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
572 memset(&iucv->src_user_id , 0, 32);
574 iucv->transport = AF_IUCV_TRANS_IUCV;
576 iucv->transport = AF_IUCV_TRANS_HIPER;
578 sk->sk_destruct = iucv_sock_destruct;
579 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
580 sk->sk_allocation = GFP_DMA;
582 sock_reset_flag(sk, SOCK_ZAPPED);
584 sk->sk_protocol = proto;
585 sk->sk_state = IUCV_OPEN;
587 iucv_sock_link(&iucv_sk_list, sk);
591 /* Create an IUCV socket */
592 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
597 if (protocol && protocol != PF_IUCV)
598 return -EPROTONOSUPPORT;
600 sock->state = SS_UNCONNECTED;
602 switch (sock->type) {
604 sock->ops = &iucv_sock_ops;
607 /* currently, proto ops can handle both sk types */
608 sock->ops = &iucv_sock_ops;
611 return -ESOCKTNOSUPPORT;
614 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
618 iucv_sock_init(sk, NULL);
623 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
625 write_lock_bh(&l->lock);
626 sk_add_node(sk, &l->head);
627 write_unlock_bh(&l->lock);
630 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
632 write_lock_bh(&l->lock);
633 sk_del_node_init(sk);
634 write_unlock_bh(&l->lock);
637 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
640 struct iucv_sock *par = iucv_sk(parent);
643 spin_lock_irqsave(&par->accept_q_lock, flags);
644 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
645 spin_unlock_irqrestore(&par->accept_q_lock, flags);
646 iucv_sk(sk)->parent = parent;
647 sk_acceptq_added(parent);
650 void iucv_accept_unlink(struct sock *sk)
653 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
655 spin_lock_irqsave(&par->accept_q_lock, flags);
656 list_del_init(&iucv_sk(sk)->accept_q);
657 spin_unlock_irqrestore(&par->accept_q_lock, flags);
658 sk_acceptq_removed(iucv_sk(sk)->parent);
659 iucv_sk(sk)->parent = NULL;
663 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
665 struct iucv_sock *isk, *n;
668 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
669 sk = (struct sock *) isk;
672 if (sk->sk_state == IUCV_CLOSED) {
673 iucv_accept_unlink(sk);
678 if (sk->sk_state == IUCV_CONNECTED ||
679 sk->sk_state == IUCV_DISCONN ||
681 iucv_accept_unlink(sk);
683 sock_graft(sk, newsock);
694 static void __iucv_auto_name(struct iucv_sock *iucv)
698 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
699 while (__iucv_get_sock_by_name(name)) {
700 sprintf(name, "%08x",
701 atomic_inc_return(&iucv_sk_list.autobind_name));
703 memcpy(iucv->src_name, name, 8);
706 /* Bind an unbound socket */
707 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
710 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
711 struct sock *sk = sock->sk;
712 struct iucv_sock *iucv;
714 struct net_device *dev;
717 /* Verify the input sockaddr */
718 if (addr_len < sizeof(struct sockaddr_iucv) ||
719 addr->sa_family != AF_IUCV)
723 if (sk->sk_state != IUCV_OPEN) {
728 write_lock_bh(&iucv_sk_list.lock);
731 if (__iucv_get_sock_by_name(sa->siucv_name)) {
738 /* Bind the socket */
740 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
741 goto vm_bind; /* VM IUCV transport */
743 /* try hiper transport */
744 memcpy(uid, sa->siucv_user_id, sizeof(uid));
747 for_each_netdev_rcu(&init_net, dev) {
748 if (!memcmp(dev->perm_addr, uid, 8)) {
749 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
750 /* Check for unitialized siucv_name */
751 if (strncmp(sa->siucv_name, " ", 8) == 0)
752 __iucv_auto_name(iucv);
754 memcpy(iucv->src_name, sa->siucv_name, 8);
755 sk->sk_bound_dev_if = dev->ifindex;
758 sk->sk_state = IUCV_BOUND;
759 iucv->transport = AF_IUCV_TRANS_HIPER;
761 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
769 /* use local userid for backward compat */
770 memcpy(iucv->src_name, sa->siucv_name, 8);
771 memcpy(iucv->src_user_id, iucv_userid, 8);
772 sk->sk_state = IUCV_BOUND;
773 iucv->transport = AF_IUCV_TRANS_IUCV;
775 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
778 /* found no dev to bind */
781 /* Release the socket list lock */
782 write_unlock_bh(&iucv_sk_list.lock);
788 /* Automatically bind an unbound socket */
789 static int iucv_sock_autobind(struct sock *sk)
791 struct iucv_sock *iucv = iucv_sk(sk);
794 if (unlikely(!pr_iucv))
797 memcpy(iucv->src_user_id, iucv_userid, 8);
799 write_lock_bh(&iucv_sk_list.lock);
800 __iucv_auto_name(iucv);
801 write_unlock_bh(&iucv_sk_list.lock);
804 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
809 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
811 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
812 struct sock *sk = sock->sk;
813 struct iucv_sock *iucv = iucv_sk(sk);
814 unsigned char user_data[16];
817 high_nmcpy(user_data, sa->siucv_name);
818 low_nmcpy(user_data, iucv->src_name);
819 ASCEBC(user_data, sizeof(user_data));
822 iucv->path = iucv_path_alloc(iucv->msglimit,
823 IUCV_IPRMDATA, GFP_KERNEL);
828 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
829 sa->siucv_user_id, NULL, user_data,
832 iucv_path_free(iucv->path);
835 case 0x0b: /* Target communicator is not logged on */
838 case 0x0d: /* Max connections for this guest exceeded */
839 case 0x0e: /* Max connections for target guest exceeded */
842 case 0x0f: /* Missing IUCV authorization */
854 /* Connect an unconnected socket */
855 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
858 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
859 struct sock *sk = sock->sk;
860 struct iucv_sock *iucv = iucv_sk(sk);
863 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
866 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
869 if (sk->sk_state == IUCV_OPEN &&
870 iucv->transport == AF_IUCV_TRANS_HIPER)
871 return -EBADFD; /* explicit bind required */
873 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
876 if (sk->sk_state == IUCV_OPEN) {
877 err = iucv_sock_autobind(sk);
884 /* Set the destination information */
885 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
886 memcpy(iucv->dst_name, sa->siucv_name, 8);
888 if (iucv->transport == AF_IUCV_TRANS_HIPER)
889 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
891 err = afiucv_path_connect(sock, addr);
895 if (sk->sk_state != IUCV_CONNECTED)
896 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
898 sock_sndtimeo(sk, flags & O_NONBLOCK));
900 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
903 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
904 iucv_sever_path(sk, 0);
911 /* Move a socket into listening state. */
912 static int iucv_sock_listen(struct socket *sock, int backlog)
914 struct sock *sk = sock->sk;
920 if (sk->sk_state != IUCV_BOUND)
923 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
926 sk->sk_max_ack_backlog = backlog;
927 sk->sk_ack_backlog = 0;
928 sk->sk_state = IUCV_LISTEN;
936 /* Accept a pending connection */
937 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
938 int flags, bool kern)
940 DECLARE_WAITQUEUE(wait, current);
941 struct sock *sk = sock->sk, *nsk;
945 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
947 if (sk->sk_state != IUCV_LISTEN) {
952 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
954 /* Wait for an incoming connection */
955 add_wait_queue_exclusive(sk_sleep(sk), &wait);
956 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
957 set_current_state(TASK_INTERRUPTIBLE);
964 timeo = schedule_timeout(timeo);
965 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
967 if (sk->sk_state != IUCV_LISTEN) {
972 if (signal_pending(current)) {
973 err = sock_intr_errno(timeo);
978 set_current_state(TASK_RUNNING);
979 remove_wait_queue(sk_sleep(sk), &wait);
984 newsock->state = SS_CONNECTED;
991 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
994 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
995 struct sock *sk = sock->sk;
996 struct iucv_sock *iucv = iucv_sk(sk);
998 addr->sa_family = AF_IUCV;
1001 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1002 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1004 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1005 memcpy(siucv->siucv_name, iucv->src_name, 8);
1007 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1008 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1009 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1011 return sizeof(struct sockaddr_iucv);
1015 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1017 * @msg: Pointer to a struct iucv_message
1018 * @skb: The socket data to send, skb->len MUST BE <= 7
1020 * Send the socket data in the parameter list in the iucv message
1021 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1022 * list and the socket data len at index 7 (last byte).
1023 * See also iucv_msg_length().
1025 * Returns the error code from the iucv_message_send() call.
1027 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1028 struct sk_buff *skb)
1032 memcpy(prmdata, (void *) skb->data, skb->len);
1033 prmdata[7] = 0xff - (u8) skb->len;
1034 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1035 (void *) prmdata, 8);
1038 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1041 struct sock *sk = sock->sk;
1042 struct iucv_sock *iucv = iucv_sk(sk);
1043 size_t headroom = 0;
1045 struct sk_buff *skb;
1046 struct iucv_message txmsg = {0};
1047 struct cmsghdr *cmsg;
1053 int noblock = msg->msg_flags & MSG_DONTWAIT;
1055 err = sock_error(sk);
1059 if (msg->msg_flags & MSG_OOB)
1062 /* SOCK_SEQPACKET: we do not support segmented records */
1063 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1068 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1073 /* Return if the socket is not in connected state */
1074 if (sk->sk_state != IUCV_CONNECTED) {
1079 /* initialize defaults */
1080 cmsg_done = 0; /* check for duplicate headers */
1083 /* iterate over control messages */
1084 for_each_cmsghdr(cmsg, msg) {
1085 if (!CMSG_OK(msg, cmsg)) {
1090 if (cmsg->cmsg_level != SOL_IUCV)
1093 if (cmsg->cmsg_type & cmsg_done) {
1097 cmsg_done |= cmsg->cmsg_type;
1099 switch (cmsg->cmsg_type) {
1100 case SCM_IUCV_TRGCLS:
1101 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1106 /* set iucv message target class */
1107 memcpy(&txmsg.class,
1108 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1118 /* allocate one skb for each iucv message:
1119 * this is fine for SOCK_SEQPACKET (unless we want to support
1120 * segmented records using the MSG_EOR flag), but
1121 * for SOCK_STREAM we might want to improve it in future */
1122 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1123 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1126 if (len < PAGE_SIZE) {
1129 /* In nonlinear "classic" iucv skb,
1130 * reserve space for iucv_array
1132 headroom = sizeof(struct iucv_array) *
1133 (MAX_SKB_FRAGS + 1);
1134 linear = PAGE_SIZE - headroom;
1137 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1142 skb_reserve(skb, headroom);
1143 skb_put(skb, linear);
1145 skb->data_len = len - linear;
1146 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1150 /* wait if outstanding messages for iucv path has reached */
1151 timeo = sock_sndtimeo(sk, noblock);
1152 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1156 /* return -ECONNRESET if the socket is no longer connected */
1157 if (sk->sk_state != IUCV_CONNECTED) {
1162 /* increment and save iucv message tag for msg_completion cbk */
1163 txmsg.tag = iucv->send_tag++;
1164 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1166 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1167 atomic_inc(&iucv->msg_sent);
1168 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1170 atomic_dec(&iucv->msg_sent);
1173 } else { /* Classic VM IUCV transport */
1174 skb_queue_tail(&iucv->send_skb_q, skb);
1176 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1178 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1180 /* on success: there is no message_complete callback */
1181 /* for an IPRMDATA msg; remove skb from send queue */
1183 skb_unlink(skb, &iucv->send_skb_q);
1187 /* this error should never happen since the */
1188 /* IUCV_IPRMDATA path flag is set... sever path */
1190 pr_iucv->path_sever(iucv->path, NULL);
1191 skb_unlink(skb, &iucv->send_skb_q);
1195 } else if (skb_is_nonlinear(skb)) {
1196 struct iucv_array *iba = (struct iucv_array *)skb->head;
1199 /* skip iucv_array lying in the headroom */
1200 iba[0].address = (u32)(addr_t)skb->data;
1201 iba[0].length = (u32)skb_headlen(skb);
1202 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1203 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1205 iba[i + 1].address =
1206 (u32)(addr_t)skb_frag_address(frag);
1207 iba[i + 1].length = (u32)skb_frag_size(frag);
1209 err = pr_iucv->message_send(iucv->path, &txmsg,
1211 (void *)iba, skb->len);
1212 } else { /* non-IPRM Linear skb */
1213 err = pr_iucv->message_send(iucv->path, &txmsg,
1214 0, 0, (void *)skb->data, skb->len);
1219 memcpy(user_id, iucv->dst_user_id, 8);
1221 memcpy(appl_id, iucv->dst_name, 8);
1223 "Application %s on z/VM guest %s exceeds message limit\n",
1229 skb_unlink(skb, &iucv->send_skb_q);
1244 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1246 size_t headroom, linear;
1247 struct sk_buff *skb;
1250 if (len < PAGE_SIZE) {
1254 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1255 linear = PAGE_SIZE - headroom;
1257 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1258 0, &err, GFP_ATOMIC | GFP_DMA);
1260 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1264 skb_reserve(skb, headroom);
1265 skb_put(skb, linear);
1267 skb->data_len = len - linear;
1272 /* iucv_process_message() - Receive a single outstanding IUCV message
1274 * Locking: must be called with message_q.lock held
1276 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1277 struct iucv_path *path,
1278 struct iucv_message *msg)
1283 len = iucv_msg_length(msg);
1285 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1286 /* Note: the first 4 bytes are reserved for msg tag */
1287 IUCV_SKB_CB(skb)->class = msg->class;
1289 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1290 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1291 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1296 if (skb_is_nonlinear(skb)) {
1297 struct iucv_array *iba = (struct iucv_array *)skb->head;
1300 iba[0].address = (u32)(addr_t)skb->data;
1301 iba[0].length = (u32)skb_headlen(skb);
1302 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1303 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1305 iba[i + 1].address =
1306 (u32)(addr_t)skb_frag_address(frag);
1307 iba[i + 1].length = (u32)skb_frag_size(frag);
1309 rc = pr_iucv->message_receive(path, msg,
1311 (void *)iba, len, NULL);
1313 rc = pr_iucv->message_receive(path, msg,
1314 msg->flags & IUCV_IPRMDATA,
1315 skb->data, len, NULL);
1321 WARN_ON_ONCE(skb->len != len);
1324 IUCV_SKB_CB(skb)->offset = 0;
1325 if (sk_filter(sk, skb)) {
1326 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1330 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1331 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1334 /* iucv_process_message_q() - Process outstanding IUCV messages
1336 * Locking: must be called with message_q.lock held
1338 static void iucv_process_message_q(struct sock *sk)
1340 struct iucv_sock *iucv = iucv_sk(sk);
1341 struct sk_buff *skb;
1342 struct sock_msg_q *p, *n;
1344 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1345 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1348 iucv_process_message(sk, skb, p->path, &p->msg);
1351 if (!skb_queue_empty(&iucv->backlog_skb_q))
1356 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1357 size_t len, int flags)
1359 int noblock = flags & MSG_DONTWAIT;
1360 struct sock *sk = sock->sk;
1361 struct iucv_sock *iucv = iucv_sk(sk);
1362 unsigned int copied, rlen;
1363 struct sk_buff *skb, *rskb, *cskb;
1367 if ((sk->sk_state == IUCV_DISCONN) &&
1368 skb_queue_empty(&iucv->backlog_skb_q) &&
1369 skb_queue_empty(&sk->sk_receive_queue) &&
1370 list_empty(&iucv->message_q.list))
1373 if (flags & (MSG_OOB))
1376 /* receive/dequeue next skb:
1377 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1378 skb = skb_recv_datagram(sk, flags, noblock, &err);
1380 if (sk->sk_shutdown & RCV_SHUTDOWN)
1385 offset = IUCV_SKB_CB(skb)->offset;
1386 rlen = skb->len - offset; /* real length of skb */
1387 copied = min_t(unsigned int, rlen, len);
1389 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1392 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1393 if (!(flags & MSG_PEEK))
1394 skb_queue_head(&sk->sk_receive_queue, skb);
1398 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1399 if (sk->sk_type == SOCK_SEQPACKET) {
1401 msg->msg_flags |= MSG_TRUNC;
1402 /* each iucv message contains a complete record */
1403 msg->msg_flags |= MSG_EOR;
1406 /* create control message to store iucv msg target class:
1407 * get the trgcls from the control buffer of the skb due to
1408 * fragmentation of original iucv message. */
1409 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1410 sizeof(IUCV_SKB_CB(skb)->class),
1411 (void *)&IUCV_SKB_CB(skb)->class);
1413 if (!(flags & MSG_PEEK))
1414 skb_queue_head(&sk->sk_receive_queue, skb);
1418 /* Mark read part of skb as used */
1419 if (!(flags & MSG_PEEK)) {
1421 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1422 if (sk->sk_type == SOCK_STREAM) {
1423 if (copied < rlen) {
1424 IUCV_SKB_CB(skb)->offset = offset + copied;
1425 skb_queue_head(&sk->sk_receive_queue, skb);
1431 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1432 atomic_inc(&iucv->msg_recv);
1433 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1435 iucv_sock_close(sk);
1440 /* Queue backlog skbs */
1441 spin_lock_bh(&iucv->message_q.lock);
1442 rskb = skb_dequeue(&iucv->backlog_skb_q);
1444 IUCV_SKB_CB(rskb)->offset = 0;
1445 if (__sock_queue_rcv_skb(sk, rskb)) {
1446 /* handle rcv queue full */
1447 skb_queue_head(&iucv->backlog_skb_q,
1451 rskb = skb_dequeue(&iucv->backlog_skb_q);
1453 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1454 if (!list_empty(&iucv->message_q.list))
1455 iucv_process_message_q(sk);
1456 if (atomic_read(&iucv->msg_recv) >=
1457 iucv->msglimit / 2) {
1458 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1460 sk->sk_state = IUCV_DISCONN;
1461 sk->sk_state_change(sk);
1465 spin_unlock_bh(&iucv->message_q.lock);
1469 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1470 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1476 static inline __poll_t iucv_accept_poll(struct sock *parent)
1478 struct iucv_sock *isk, *n;
1481 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1482 sk = (struct sock *) isk;
1484 if (sk->sk_state == IUCV_CONNECTED)
1485 return EPOLLIN | EPOLLRDNORM;
1491 static __poll_t iucv_sock_poll_mask(struct socket *sock, __poll_t events)
1493 struct sock *sk = sock->sk;
1496 if (sk->sk_state == IUCV_LISTEN)
1497 return iucv_accept_poll(sk);
1499 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1501 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1503 if (sk->sk_shutdown & RCV_SHUTDOWN)
1506 if (sk->sk_shutdown == SHUTDOWN_MASK)
1509 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1510 (sk->sk_shutdown & RCV_SHUTDOWN))
1511 mask |= EPOLLIN | EPOLLRDNORM;
1513 if (sk->sk_state == IUCV_CLOSED)
1516 if (sk->sk_state == IUCV_DISCONN)
1519 if (sock_writeable(sk) && iucv_below_msglim(sk))
1520 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1522 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1527 static int iucv_sock_shutdown(struct socket *sock, int how)
1529 struct sock *sk = sock->sk;
1530 struct iucv_sock *iucv = iucv_sk(sk);
1531 struct iucv_message txmsg;
1536 if ((how & ~SHUTDOWN_MASK) || !how)
1540 switch (sk->sk_state) {
1551 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1552 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1555 err = pr_iucv->message_send(iucv->path, &txmsg,
1556 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1571 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1574 sk->sk_shutdown |= how;
1575 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1576 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1578 err = pr_iucv->path_quiesce(iucv->path, NULL);
1581 /* skb_queue_purge(&sk->sk_receive_queue); */
1583 skb_queue_purge(&sk->sk_receive_queue);
1586 /* Wake up anyone sleeping in poll */
1587 sk->sk_state_change(sk);
1594 static int iucv_sock_release(struct socket *sock)
1596 struct sock *sk = sock->sk;
1602 iucv_sock_close(sk);
1609 /* getsockopt and setsockopt */
1610 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1611 char __user *optval, unsigned int optlen)
1613 struct sock *sk = sock->sk;
1614 struct iucv_sock *iucv = iucv_sk(sk);
1618 if (level != SOL_IUCV)
1619 return -ENOPROTOOPT;
1621 if (optlen < sizeof(int))
1624 if (get_user(val, (int __user *) optval))
1631 case SO_IPRMDATA_MSG:
1633 iucv->flags |= IUCV_IPRMDATA;
1635 iucv->flags &= ~IUCV_IPRMDATA;
1638 switch (sk->sk_state) {
1641 if (val < 1 || val > (u16)(~0))
1644 iucv->msglimit = val;
1660 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1661 char __user *optval, int __user *optlen)
1663 struct sock *sk = sock->sk;
1664 struct iucv_sock *iucv = iucv_sk(sk);
1668 if (level != SOL_IUCV)
1669 return -ENOPROTOOPT;
1671 if (get_user(len, optlen))
1677 len = min_t(unsigned int, len, sizeof(int));
1680 case SO_IPRMDATA_MSG:
1681 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1685 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1686 : iucv->msglimit; /* default */
1690 if (sk->sk_state == IUCV_OPEN)
1692 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1693 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1697 return -ENOPROTOOPT;
1700 if (put_user(len, optlen))
1702 if (copy_to_user(optval, &val, len))
1709 /* Callback wrappers - called from iucv base support */
1710 static int iucv_callback_connreq(struct iucv_path *path,
1711 u8 ipvmid[8], u8 ipuser[16])
1713 unsigned char user_data[16];
1714 unsigned char nuser_data[16];
1715 unsigned char src_name[8];
1716 struct sock *sk, *nsk;
1717 struct iucv_sock *iucv, *niucv;
1720 memcpy(src_name, ipuser, 8);
1721 EBCASC(src_name, 8);
1722 /* Find out if this path belongs to af_iucv. */
1723 read_lock(&iucv_sk_list.lock);
1726 sk_for_each(sk, &iucv_sk_list.head)
1727 if (sk->sk_state == IUCV_LISTEN &&
1728 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1730 * Found a listening socket with
1731 * src_name == ipuser[0-7].
1736 read_unlock(&iucv_sk_list.lock);
1738 /* No socket found, not one of our paths. */
1743 /* Check if parent socket is listening */
1744 low_nmcpy(user_data, iucv->src_name);
1745 high_nmcpy(user_data, iucv->dst_name);
1746 ASCEBC(user_data, sizeof(user_data));
1747 if (sk->sk_state != IUCV_LISTEN) {
1748 err = pr_iucv->path_sever(path, user_data);
1749 iucv_path_free(path);
1753 /* Check for backlog size */
1754 if (sk_acceptq_is_full(sk)) {
1755 err = pr_iucv->path_sever(path, user_data);
1756 iucv_path_free(path);
1760 /* Create the new socket */
1761 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1763 err = pr_iucv->path_sever(path, user_data);
1764 iucv_path_free(path);
1768 niucv = iucv_sk(nsk);
1769 iucv_sock_init(nsk, sk);
1771 /* Set the new iucv_sock */
1772 memcpy(niucv->dst_name, ipuser + 8, 8);
1773 EBCASC(niucv->dst_name, 8);
1774 memcpy(niucv->dst_user_id, ipvmid, 8);
1775 memcpy(niucv->src_name, iucv->src_name, 8);
1776 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1779 /* Call iucv_accept */
1780 high_nmcpy(nuser_data, ipuser + 8);
1781 memcpy(nuser_data + 8, niucv->src_name, 8);
1782 ASCEBC(nuser_data + 8, 8);
1784 /* set message limit for path based on msglimit of accepting socket */
1785 niucv->msglimit = iucv->msglimit;
1786 path->msglim = iucv->msglimit;
1787 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1789 iucv_sever_path(nsk, 1);
1790 iucv_sock_kill(nsk);
1794 iucv_accept_enqueue(sk, nsk);
1796 /* Wake up accept */
1797 nsk->sk_state = IUCV_CONNECTED;
1798 sk->sk_data_ready(sk);
1805 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1807 struct sock *sk = path->private;
1809 sk->sk_state = IUCV_CONNECTED;
1810 sk->sk_state_change(sk);
1813 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1815 struct sock *sk = path->private;
1816 struct iucv_sock *iucv = iucv_sk(sk);
1817 struct sk_buff *skb;
1818 struct sock_msg_q *save_msg;
1821 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1822 pr_iucv->message_reject(path, msg);
1826 spin_lock(&iucv->message_q.lock);
1828 if (!list_empty(&iucv->message_q.list) ||
1829 !skb_queue_empty(&iucv->backlog_skb_q))
1832 len = atomic_read(&sk->sk_rmem_alloc);
1833 len += SKB_TRUESIZE(iucv_msg_length(msg));
1834 if (len > sk->sk_rcvbuf)
1837 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1841 iucv_process_message(sk, skb, path, msg);
1845 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1848 save_msg->path = path;
1849 save_msg->msg = *msg;
1851 list_add_tail(&save_msg->list, &iucv->message_q.list);
1854 spin_unlock(&iucv->message_q.lock);
1857 static void iucv_callback_txdone(struct iucv_path *path,
1858 struct iucv_message *msg)
1860 struct sock *sk = path->private;
1861 struct sk_buff *this = NULL;
1862 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1863 struct sk_buff *list_skb = list->next;
1864 unsigned long flags;
1867 if (!skb_queue_empty(list)) {
1868 spin_lock_irqsave(&list->lock, flags);
1870 while (list_skb != (struct sk_buff *)list) {
1871 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1875 list_skb = list_skb->next;
1878 __skb_unlink(this, list);
1880 spin_unlock_irqrestore(&list->lock, flags);
1884 /* wake up any process waiting for sending */
1885 iucv_sock_wake_msglim(sk);
1889 if (sk->sk_state == IUCV_CLOSING) {
1890 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1891 sk->sk_state = IUCV_CLOSED;
1892 sk->sk_state_change(sk);
1899 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1901 struct sock *sk = path->private;
1903 if (sk->sk_state == IUCV_CLOSED)
1907 iucv_sever_path(sk, 1);
1908 sk->sk_state = IUCV_DISCONN;
1910 sk->sk_state_change(sk);
1914 /* called if the other communication side shuts down its RECV direction;
1915 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1917 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1919 struct sock *sk = path->private;
1922 if (sk->sk_state != IUCV_CLOSED) {
1923 sk->sk_shutdown |= SEND_SHUTDOWN;
1924 sk->sk_state_change(sk);
1929 /***************** HiperSockets transport callbacks ********************/
1930 static void afiucv_swap_src_dest(struct sk_buff *skb)
1932 struct af_iucv_trans_hdr *trans_hdr =
1933 (struct af_iucv_trans_hdr *)skb->data;
1937 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1938 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1939 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1940 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1941 memcpy(tmpID, trans_hdr->srcUserID, 8);
1942 memcpy(tmpName, trans_hdr->srcAppName, 8);
1943 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1944 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1945 memcpy(trans_hdr->destUserID, tmpID, 8);
1946 memcpy(trans_hdr->destAppName, tmpName, 8);
1947 skb_push(skb, ETH_HLEN);
1948 memset(skb->data, 0, ETH_HLEN);
1952 * afiucv_hs_callback_syn - react on received SYN
1954 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1957 struct iucv_sock *iucv, *niucv;
1958 struct af_iucv_trans_hdr *trans_hdr;
1962 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1964 /* no sock - connection refused */
1965 afiucv_swap_src_dest(skb);
1966 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1967 err = dev_queue_xmit(skb);
1971 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1973 if ((sk->sk_state != IUCV_LISTEN) ||
1974 sk_acceptq_is_full(sk) ||
1976 /* error on server socket - connection refused */
1977 afiucv_swap_src_dest(skb);
1978 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1979 err = dev_queue_xmit(skb);
1980 iucv_sock_kill(nsk);
1985 niucv = iucv_sk(nsk);
1986 iucv_sock_init(nsk, sk);
1987 niucv->transport = AF_IUCV_TRANS_HIPER;
1988 niucv->msglimit = iucv->msglimit;
1989 if (!trans_hdr->window)
1990 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1992 niucv->msglimit_peer = trans_hdr->window;
1993 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1994 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1995 memcpy(niucv->src_name, iucv->src_name, 8);
1996 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1997 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1998 niucv->hs_dev = iucv->hs_dev;
1999 dev_hold(niucv->hs_dev);
2000 afiucv_swap_src_dest(skb);
2001 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2002 trans_hdr->window = niucv->msglimit;
2003 /* if receiver acks the xmit connection is established */
2004 err = dev_queue_xmit(skb);
2006 iucv_accept_enqueue(sk, nsk);
2007 nsk->sk_state = IUCV_CONNECTED;
2008 sk->sk_data_ready(sk);
2010 iucv_sock_kill(nsk);
2014 return NET_RX_SUCCESS;
2018 * afiucv_hs_callback_synack() - react on received SYN-ACK
2020 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2022 struct iucv_sock *iucv = iucv_sk(sk);
2023 struct af_iucv_trans_hdr *trans_hdr =
2024 (struct af_iucv_trans_hdr *)skb->data;
2028 if (sk->sk_state != IUCV_BOUND)
2031 iucv->msglimit_peer = trans_hdr->window;
2032 sk->sk_state = IUCV_CONNECTED;
2033 sk->sk_state_change(sk);
2037 return NET_RX_SUCCESS;
2041 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2043 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2045 struct iucv_sock *iucv = iucv_sk(sk);
2049 if (sk->sk_state != IUCV_BOUND)
2052 sk->sk_state = IUCV_DISCONN;
2053 sk->sk_state_change(sk);
2057 return NET_RX_SUCCESS;
2061 * afiucv_hs_callback_fin() - react on received FIN
2063 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2065 struct iucv_sock *iucv = iucv_sk(sk);
2067 /* other end of connection closed */
2071 if (sk->sk_state == IUCV_CONNECTED) {
2072 sk->sk_state = IUCV_DISCONN;
2073 sk->sk_state_change(sk);
2078 return NET_RX_SUCCESS;
2082 * afiucv_hs_callback_win() - react on received WIN
2084 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2086 struct iucv_sock *iucv = iucv_sk(sk);
2087 struct af_iucv_trans_hdr *trans_hdr =
2088 (struct af_iucv_trans_hdr *)skb->data;
2091 return NET_RX_SUCCESS;
2093 if (sk->sk_state != IUCV_CONNECTED)
2094 return NET_RX_SUCCESS;
2096 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2097 iucv_sock_wake_msglim(sk);
2098 return NET_RX_SUCCESS;
2102 * afiucv_hs_callback_rx() - react on received data
2104 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2106 struct iucv_sock *iucv = iucv_sk(sk);
2110 return NET_RX_SUCCESS;
2113 if (sk->sk_state != IUCV_CONNECTED) {
2115 return NET_RX_SUCCESS;
2118 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2120 return NET_RX_SUCCESS;
2123 /* write stuff from iucv_msg to skb cb */
2124 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2125 skb_reset_transport_header(skb);
2126 skb_reset_network_header(skb);
2127 IUCV_SKB_CB(skb)->offset = 0;
2128 if (sk_filter(sk, skb)) {
2129 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2131 return NET_RX_SUCCESS;
2134 spin_lock(&iucv->message_q.lock);
2135 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2136 if (__sock_queue_rcv_skb(sk, skb))
2137 /* handle rcv queue full */
2138 skb_queue_tail(&iucv->backlog_skb_q, skb);
2140 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2141 spin_unlock(&iucv->message_q.lock);
2142 return NET_RX_SUCCESS;
2146 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2148 * called from netif RX softirq
2150 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2151 struct packet_type *pt, struct net_device *orig_dev)
2154 struct iucv_sock *iucv;
2155 struct af_iucv_trans_hdr *trans_hdr;
2159 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2160 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2162 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2164 return NET_RX_SUCCESS;
2166 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2167 if (skb_linearize(skb)) {
2168 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2171 return NET_RX_SUCCESS;
2173 skb_pull(skb, ETH_HLEN);
2174 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2175 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2176 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2177 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2178 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2179 memset(nullstring, 0, sizeof(nullstring));
2182 read_lock(&iucv_sk_list.lock);
2183 sk_for_each(sk, &iucv_sk_list.head) {
2184 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2185 if ((!memcmp(&iucv_sk(sk)->src_name,
2186 trans_hdr->destAppName, 8)) &&
2187 (!memcmp(&iucv_sk(sk)->src_user_id,
2188 trans_hdr->destUserID, 8)) &&
2189 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2190 (!memcmp(&iucv_sk(sk)->dst_user_id,
2196 if ((!memcmp(&iucv_sk(sk)->src_name,
2197 trans_hdr->destAppName, 8)) &&
2198 (!memcmp(&iucv_sk(sk)->src_user_id,
2199 trans_hdr->destUserID, 8)) &&
2200 (!memcmp(&iucv_sk(sk)->dst_name,
2201 trans_hdr->srcAppName, 8)) &&
2202 (!memcmp(&iucv_sk(sk)->dst_user_id,
2203 trans_hdr->srcUserID, 8))) {
2209 read_unlock(&iucv_sk_list.lock);
2214 how should we send with no sock
2215 1) send without sock no send rc checking?
2216 2) introduce default sock to handle this cases
2218 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2220 SYN|ACK, SYN|FIN, FIN -> no action? */
2222 switch (trans_hdr->flags) {
2223 case AF_IUCV_FLAG_SYN:
2224 /* connect request */
2225 err = afiucv_hs_callback_syn(sk, skb);
2227 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2228 /* connect request confirmed */
2229 err = afiucv_hs_callback_synack(sk, skb);
2231 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2232 /* connect request refused */
2233 err = afiucv_hs_callback_synfin(sk, skb);
2235 case (AF_IUCV_FLAG_FIN):
2237 err = afiucv_hs_callback_fin(sk, skb);
2239 case (AF_IUCV_FLAG_WIN):
2240 err = afiucv_hs_callback_win(sk, skb);
2241 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2245 /* fall through and receive non-zero length data */
2246 case (AF_IUCV_FLAG_SHT):
2247 /* shutdown request */
2248 /* fall through and receive zero length data */
2250 /* plain data frame */
2251 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2252 err = afiucv_hs_callback_rx(sk, skb);
2262 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2265 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2266 enum iucv_tx_notify n)
2268 struct sock *isk = skb->sk;
2269 struct sock *sk = NULL;
2270 struct iucv_sock *iucv = NULL;
2271 struct sk_buff_head *list;
2272 struct sk_buff *list_skb;
2273 struct sk_buff *nskb;
2274 unsigned long flags;
2276 read_lock_irqsave(&iucv_sk_list.lock, flags);
2277 sk_for_each(sk, &iucv_sk_list.head)
2282 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2284 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2287 list = &iucv->send_skb_q;
2288 spin_lock_irqsave(&list->lock, flags);
2289 if (skb_queue_empty(list))
2291 list_skb = list->next;
2292 nskb = list_skb->next;
2293 while (list_skb != (struct sk_buff *)list) {
2294 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2297 __skb_unlink(list_skb, list);
2298 kfree_skb(list_skb);
2299 iucv_sock_wake_msglim(sk);
2301 case TX_NOTIFY_PENDING:
2302 atomic_inc(&iucv->pendings);
2304 case TX_NOTIFY_DELAYED_OK:
2305 __skb_unlink(list_skb, list);
2306 atomic_dec(&iucv->pendings);
2307 if (atomic_read(&iucv->pendings) <= 0)
2308 iucv_sock_wake_msglim(sk);
2309 kfree_skb(list_skb);
2311 case TX_NOTIFY_UNREACHABLE:
2312 case TX_NOTIFY_DELAYED_UNREACHABLE:
2313 case TX_NOTIFY_TPQFULL: /* not yet used */
2314 case TX_NOTIFY_GENERALERROR:
2315 case TX_NOTIFY_DELAYED_GENERALERROR:
2316 __skb_unlink(list_skb, list);
2317 kfree_skb(list_skb);
2318 if (sk->sk_state == IUCV_CONNECTED) {
2319 sk->sk_state = IUCV_DISCONN;
2320 sk->sk_state_change(sk);
2330 spin_unlock_irqrestore(&list->lock, flags);
2332 if (sk->sk_state == IUCV_CLOSING) {
2333 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2334 sk->sk_state = IUCV_CLOSED;
2335 sk->sk_state_change(sk);
2342 * afiucv_netdev_event: handle netdev notifier chain events
2344 static int afiucv_netdev_event(struct notifier_block *this,
2345 unsigned long event, void *ptr)
2347 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2349 struct iucv_sock *iucv;
2353 case NETDEV_GOING_DOWN:
2354 sk_for_each(sk, &iucv_sk_list.head) {
2356 if ((iucv->hs_dev == event_dev) &&
2357 (sk->sk_state == IUCV_CONNECTED)) {
2358 if (event == NETDEV_GOING_DOWN)
2359 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2360 sk->sk_state = IUCV_DISCONN;
2361 sk->sk_state_change(sk);
2366 case NETDEV_UNREGISTER:
2373 static struct notifier_block afiucv_netdev_notifier = {
2374 .notifier_call = afiucv_netdev_event,
2377 static const struct proto_ops iucv_sock_ops = {
2379 .owner = THIS_MODULE,
2380 .release = iucv_sock_release,
2381 .bind = iucv_sock_bind,
2382 .connect = iucv_sock_connect,
2383 .listen = iucv_sock_listen,
2384 .accept = iucv_sock_accept,
2385 .getname = iucv_sock_getname,
2386 .sendmsg = iucv_sock_sendmsg,
2387 .recvmsg = iucv_sock_recvmsg,
2388 .poll_mask = iucv_sock_poll_mask,
2389 .ioctl = sock_no_ioctl,
2390 .mmap = sock_no_mmap,
2391 .socketpair = sock_no_socketpair,
2392 .shutdown = iucv_sock_shutdown,
2393 .setsockopt = iucv_sock_setsockopt,
2394 .getsockopt = iucv_sock_getsockopt,
2397 static const struct net_proto_family iucv_sock_family_ops = {
2399 .owner = THIS_MODULE,
2400 .create = iucv_sock_create,
2403 static struct packet_type iucv_packet_type = {
2404 .type = cpu_to_be16(ETH_P_AF_IUCV),
2405 .func = afiucv_hs_rcv,
2408 static int afiucv_iucv_init(void)
2412 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2415 /* establish dummy device */
2416 af_iucv_driver.bus = pr_iucv->bus;
2417 err = driver_register(&af_iucv_driver);
2420 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2425 dev_set_name(af_iucv_dev, "af_iucv");
2426 af_iucv_dev->bus = pr_iucv->bus;
2427 af_iucv_dev->parent = pr_iucv->root;
2428 af_iucv_dev->release = (void (*)(struct device *))kfree;
2429 af_iucv_dev->driver = &af_iucv_driver;
2430 err = device_register(af_iucv_dev);
2436 put_device(af_iucv_dev);
2438 driver_unregister(&af_iucv_driver);
2440 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2445 static int __init afiucv_init(void)
2449 if (MACHINE_IS_VM) {
2450 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2451 if (unlikely(err)) {
2453 err = -EPROTONOSUPPORT;
2457 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2459 printk(KERN_WARNING "iucv_if lookup failed\n");
2460 memset(&iucv_userid, 0, sizeof(iucv_userid));
2463 memset(&iucv_userid, 0, sizeof(iucv_userid));
2467 err = proto_register(&iucv_proto, 0);
2470 err = sock_register(&iucv_sock_family_ops);
2475 err = afiucv_iucv_init();
2479 register_netdevice_notifier(&afiucv_netdev_notifier);
2480 dev_add_pack(&iucv_packet_type);
2484 sock_unregister(PF_IUCV);
2486 proto_unregister(&iucv_proto);
2489 symbol_put(iucv_if);
2493 static void __exit afiucv_exit(void)
2496 device_unregister(af_iucv_dev);
2497 driver_unregister(&af_iucv_driver);
2498 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2499 symbol_put(iucv_if);
2501 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2502 dev_remove_pack(&iucv_packet_type);
2503 sock_unregister(PF_IUCV);
2504 proto_unregister(&iucv_proto);
2507 module_init(afiucv_init);
2508 module_exit(afiucv_exit);
2510 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2511 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2512 MODULE_VERSION(VERSION);
2513 MODULE_LICENSE("GPL");
2514 MODULE_ALIAS_NETPROTO(PF_IUCV);