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Merge branch 'sched/urgent'
[linux-2.6/x86.git] / net / iucv / af_iucv.c
blobe2013e434d03a5758ae2c269b7beafa3987c1c8f
1 /*
2 * IUCV protocol stack for Linux on zSeries
3 *
4 * Copyright IBM Corp. 2006, 2009
5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
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 <net/sock.h>
26 #include <asm/ebcdic.h>
27 #include <asm/cpcmd.h>
28 #include <linux/kmod.h>
29
30 #include <net/iucv/iucv.h>
31 #include <net/iucv/af_iucv.h>
32
33 #define VERSION "1.1"
34
35 static char iucv_userid[80];
36
37 static const struct proto_ops iucv_sock_ops;
38
39 static struct proto iucv_proto = {
40 .name = "AF_IUCV",
41 .owner = THIS_MODULE,
42 .obj_size = sizeof(struct iucv_sock),
43 };
44
45 /* special AF_IUCV IPRM messages */
46 static const u8 iprm_shutdown[8] =
47 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
48
49 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
50
51 /* macros to set/get socket control buffer at correct offset */
52 #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */
53 #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag))
54 #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
55 #define CB_TRGCLS_LEN (TRGCLS_SIZE)
56
57 #define __iucv_sock_wait(sk, condition, timeo, ret) \
58 do { \
59 DEFINE_WAIT(__wait); \
60 long __timeo = timeo; \
61 ret = 0; \
62 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
63 while (!(condition)) { \
64 if (!__timeo) { \
65 ret = -EAGAIN; \
66 break; \
67 } \
68 if (signal_pending(current)) { \
69 ret = sock_intr_errno(__timeo); \
70 break; \
71 } \
72 release_sock(sk); \
73 __timeo = schedule_timeout(__timeo); \
74 lock_sock(sk); \
75 ret = sock_error(sk); \
76 if (ret) \
77 break; \
78 } \
79 finish_wait(sk_sleep(sk), &__wait); \
80 } while (0)
81
82 #define iucv_sock_wait(sk, condition, timeo) \
83 ({ \
84 int __ret = 0; \
85 if (!(condition)) \
86 __iucv_sock_wait(sk, condition, timeo, __ret); \
87 __ret; \
88 })
89
90 static void iucv_sock_kill(struct sock *sk);
91 static void iucv_sock_close(struct sock *sk);
92
93 /* Call Back functions */
94 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
95 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
96 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
97 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
98 u8 ipuser[16]);
99 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
100 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
101
102 static struct iucv_sock_list iucv_sk_list = {
103 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
104 .autobind_name = ATOMIC_INIT(0)
105 };
106
107 static struct iucv_handler af_iucv_handler = {
108 .path_pending = iucv_callback_connreq,
109 .path_complete = iucv_callback_connack,
110 .path_severed = iucv_callback_connrej,
111 .message_pending = iucv_callback_rx,
112 .message_complete = iucv_callback_txdone,
113 .path_quiesced = iucv_callback_shutdown,
114 };
115
116 static inline void high_nmcpy(unsigned char *dst, char *src)
117 {
118 memcpy(dst, src, 8);
119 }
120
121 static inline void low_nmcpy(unsigned char *dst, char *src)
122 {
123 memcpy(&dst[8], src, 8);
124 }
125
126 static int afiucv_pm_prepare(struct device *dev)
127 {
128 #ifdef CONFIG_PM_DEBUG
129 printk(KERN_WARNING "afiucv_pm_prepare\n");
130 #endif
131 return 0;
132 }
133
134 static void afiucv_pm_complete(struct device *dev)
135 {
136 #ifdef CONFIG_PM_DEBUG
137 printk(KERN_WARNING "afiucv_pm_complete\n");
138 #endif
139 }
140
141 /**
142 * afiucv_pm_freeze() - Freeze PM callback
143 * @dev: AFIUCV dummy device
144 *
145 * Sever all established IUCV communication pathes
146 */
147 static int afiucv_pm_freeze(struct device *dev)
148 {
149 struct iucv_sock *iucv;
150 struct sock *sk;
151 struct hlist_node *node;
152 int err = 0;
153
154 #ifdef CONFIG_PM_DEBUG
155 printk(KERN_WARNING "afiucv_pm_freeze\n");
156 #endif
157 read_lock(&iucv_sk_list.lock);
158 sk_for_each(sk, node, &iucv_sk_list.head) {
159 iucv = iucv_sk(sk);
160 skb_queue_purge(&iucv->send_skb_q);
161 skb_queue_purge(&iucv->backlog_skb_q);
162 switch (sk->sk_state) {
163 case IUCV_SEVERED:
164 case IUCV_DISCONN:
165 case IUCV_CLOSING:
166 case IUCV_CONNECTED:
167 if (iucv->path) {
168 err = iucv_path_sever(iucv->path, NULL);
169 iucv_path_free(iucv->path);
170 iucv->path = NULL;
171 }
172 break;
173 case IUCV_OPEN:
174 case IUCV_BOUND:
175 case IUCV_LISTEN:
176 case IUCV_CLOSED:
177 default:
178 break;
179 }
180 }
181 read_unlock(&iucv_sk_list.lock);
182 return err;
183 }
184
185 /**
186 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
187 * @dev: AFIUCV dummy device
188 *
189 * socket clean up after freeze
190 */
191 static int afiucv_pm_restore_thaw(struct device *dev)
192 {
193 struct sock *sk;
194 struct hlist_node *node;
195
196 #ifdef CONFIG_PM_DEBUG
197 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
198 #endif
199 read_lock(&iucv_sk_list.lock);
200 sk_for_each(sk, node, &iucv_sk_list.head) {
201 switch (sk->sk_state) {
202 case IUCV_CONNECTED:
203 sk->sk_err = EPIPE;
204 sk->sk_state = IUCV_DISCONN;
205 sk->sk_state_change(sk);
206 break;
207 case IUCV_DISCONN:
208 case IUCV_SEVERED:
209 case IUCV_CLOSING:
210 case IUCV_LISTEN:
211 case IUCV_BOUND:
212 case IUCV_OPEN:
213 default:
214 break;
215 }
216 }
217 read_unlock(&iucv_sk_list.lock);
218 return 0;
219 }
220
221 static const struct dev_pm_ops afiucv_pm_ops = {
222 .prepare = afiucv_pm_prepare,
223 .complete = afiucv_pm_complete,
224 .freeze = afiucv_pm_freeze,
225 .thaw = afiucv_pm_restore_thaw,
226 .restore = afiucv_pm_restore_thaw,
227 };
228
229 static struct device_driver af_iucv_driver = {
230 .owner = THIS_MODULE,
231 .name = "afiucv",
232 .bus = &iucv_bus,
233 .pm = &afiucv_pm_ops,
234 };
235
236 /* dummy device used as trigger for PM functions */
237 static struct device *af_iucv_dev;
238
239 /**
240 * iucv_msg_length() - Returns the length of an iucv message.
241 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
242 *
243 * The function returns the length of the specified iucv message @msg of data
244 * stored in a buffer and of data stored in the parameter list (PRMDATA).
245 *
246 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
247 * data:
248 * PRMDATA[0..6] socket data (max 7 bytes);
249 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
250 *
251 * The socket data length is computed by subtracting the socket data length
252 * value from 0xFF.
253 * If the socket data len is greater 7, then PRMDATA can be used for special
254 * notifications (see iucv_sock_shutdown); and further,
255 * if the socket data len is > 7, the function returns 8.
256 *
257 * Use this function to allocate socket buffers to store iucv message data.
258 */
259 static inline size_t iucv_msg_length(struct iucv_message *msg)
260 {
261 size_t datalen;
262
263 if (msg->flags & IUCV_IPRMDATA) {
264 datalen = 0xff - msg->rmmsg[7];
265 return (datalen < 8) ? datalen : 8;
266 }
267 return msg->length;
268 }
269
270 /**
271 * iucv_sock_in_state() - check for specific states
272 * @sk: sock structure
273 * @state: first iucv sk state
274 * @state: second iucv sk state
275 *
276 * Returns true if the socket in either in the first or second state.
277 */
278 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
279 {
280 return (sk->sk_state == state || sk->sk_state == state2);
281 }
282
283 /**
284 * iucv_below_msglim() - function to check if messages can be sent
285 * @sk: sock structure
286 *
287 * Returns true if the send queue length is lower than the message limit.
288 * Always returns true if the socket is not connected (no iucv path for
289 * checking the message limit).
290 */
291 static inline int iucv_below_msglim(struct sock *sk)
292 {
293 struct iucv_sock *iucv = iucv_sk(sk);
294
295 if (sk->sk_state != IUCV_CONNECTED)
296 return 1;
297 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
298 }
299
300 /**
301 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
302 */
303 static void iucv_sock_wake_msglim(struct sock *sk)
304 {
305 struct socket_wq *wq;
306
307 rcu_read_lock();
308 wq = rcu_dereference(sk->sk_wq);
309 if (wq_has_sleeper(wq))
310 wake_up_interruptible_all(&wq->wait);
311 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
312 rcu_read_unlock();
313 }
314
315 /* Timers */
316 static void iucv_sock_timeout(unsigned long arg)
317 {
318 struct sock *sk = (struct sock *)arg;
319
320 bh_lock_sock(sk);
321 sk->sk_err = ETIMEDOUT;
322 sk->sk_state_change(sk);
323 bh_unlock_sock(sk);
324
325 iucv_sock_kill(sk);
326 sock_put(sk);
327 }
328
329 static void iucv_sock_clear_timer(struct sock *sk)
330 {
331 sk_stop_timer(sk, &sk->sk_timer);
332 }
333
334 static struct sock *__iucv_get_sock_by_name(char *nm)
335 {
336 struct sock *sk;
337 struct hlist_node *node;
338
339 sk_for_each(sk, node, &iucv_sk_list.head)
340 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
341 return sk;
342
343 return NULL;
344 }
345
346 static void iucv_sock_destruct(struct sock *sk)
347 {
348 skb_queue_purge(&sk->sk_receive_queue);
349 skb_queue_purge(&sk->sk_write_queue);
350 }
351
352 /* Cleanup Listen */
353 static void iucv_sock_cleanup_listen(struct sock *parent)
354 {
355 struct sock *sk;
356
357 /* Close non-accepted connections */
358 while ((sk = iucv_accept_dequeue(parent, NULL))) {
359 iucv_sock_close(sk);
360 iucv_sock_kill(sk);
361 }
362
363 parent->sk_state = IUCV_CLOSED;
364 }
365
366 /* Kill socket (only if zapped and orphaned) */
367 static void iucv_sock_kill(struct sock *sk)
368 {
369 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
370 return;
371
372 iucv_sock_unlink(&iucv_sk_list, sk);
373 sock_set_flag(sk, SOCK_DEAD);
374 sock_put(sk);
375 }
376
377 /* Close an IUCV socket */
378 static void iucv_sock_close(struct sock *sk)
379 {
380 unsigned char user_data[16];
381 struct iucv_sock *iucv = iucv_sk(sk);
382 unsigned long timeo;
383
384 iucv_sock_clear_timer(sk);
385 lock_sock(sk);
386
387 switch (sk->sk_state) {
388 case IUCV_LISTEN:
389 iucv_sock_cleanup_listen(sk);
390 break;
391
392 case IUCV_CONNECTED:
393 case IUCV_DISCONN:
394 sk->sk_state = IUCV_CLOSING;
395 sk->sk_state_change(sk);
396
397 if (!skb_queue_empty(&iucv->send_skb_q)) {
398 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
399 timeo = sk->sk_lingertime;
400 else
401 timeo = IUCV_DISCONN_TIMEOUT;
402 iucv_sock_wait(sk,
403 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
404 timeo);
405 }
406
407 case IUCV_CLOSING: /* fall through */
408 sk->sk_state = IUCV_CLOSED;
409 sk->sk_state_change(sk);
410
411 if (iucv->path) {
412 low_nmcpy(user_data, iucv->src_name);
413 high_nmcpy(user_data, iucv->dst_name);
414 ASCEBC(user_data, sizeof(user_data));
415 iucv_path_sever(iucv->path, user_data);
416 iucv_path_free(iucv->path);
417 iucv->path = NULL;
418 }
419
420 sk->sk_err = ECONNRESET;
421 sk->sk_state_change(sk);
422
423 skb_queue_purge(&iucv->send_skb_q);
424 skb_queue_purge(&iucv->backlog_skb_q);
425 break;
426
427 default:
428 /* nothing to do here */
429 break;
430 }
431
432 /* mark socket for deletion by iucv_sock_kill() */
433 sock_set_flag(sk, SOCK_ZAPPED);
434
435 release_sock(sk);
436 }
437
438 static void iucv_sock_init(struct sock *sk, struct sock *parent)
439 {
440 if (parent)
441 sk->sk_type = parent->sk_type;
442 }
443
444 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
445 {
446 struct sock *sk;
447
448 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
449 if (!sk)
450 return NULL;
451
452 sock_init_data(sock, sk);
453 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
454 spin_lock_init(&iucv_sk(sk)->accept_q_lock);
455 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
456 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
457 spin_lock_init(&iucv_sk(sk)->message_q.lock);
458 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
459 iucv_sk(sk)->send_tag = 0;
460 iucv_sk(sk)->flags = 0;
461 iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT;
462 iucv_sk(sk)->path = NULL;
463 memset(&iucv_sk(sk)->src_user_id , 0, 32);
464
465 sk->sk_destruct = iucv_sock_destruct;
466 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
467 sk->sk_allocation = GFP_DMA;
468
469 sock_reset_flag(sk, SOCK_ZAPPED);
470
471 sk->sk_protocol = proto;
472 sk->sk_state = IUCV_OPEN;
473
474 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
475
476 iucv_sock_link(&iucv_sk_list, sk);
477 return sk;
478 }
479
480 /* Create an IUCV socket */
481 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
482 int kern)
483 {
484 struct sock *sk;
485
486 if (protocol && protocol != PF_IUCV)
487 return -EPROTONOSUPPORT;
488
489 sock->state = SS_UNCONNECTED;
490
491 switch (sock->type) {
492 case SOCK_STREAM:
493 sock->ops = &iucv_sock_ops;
494 break;
495 case SOCK_SEQPACKET:
496 /* currently, proto ops can handle both sk types */
497 sock->ops = &iucv_sock_ops;
498 break;
499 default:
500 return -ESOCKTNOSUPPORT;
501 }
502
503 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
504 if (!sk)
505 return -ENOMEM;
506
507 iucv_sock_init(sk, NULL);
508
509 return 0;
510 }
511
512 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
513 {
514 write_lock_bh(&l->lock);
515 sk_add_node(sk, &l->head);
516 write_unlock_bh(&l->lock);
517 }
518
519 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
520 {
521 write_lock_bh(&l->lock);
522 sk_del_node_init(sk);
523 write_unlock_bh(&l->lock);
524 }
525
526 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
527 {
528 unsigned long flags;
529 struct iucv_sock *par = iucv_sk(parent);
530
531 sock_hold(sk);
532 spin_lock_irqsave(&par->accept_q_lock, flags);
533 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
534 spin_unlock_irqrestore(&par->accept_q_lock, flags);
535 iucv_sk(sk)->parent = parent;
536 sk_acceptq_added(parent);
537 }
538
539 void iucv_accept_unlink(struct sock *sk)
540 {
541 unsigned long flags;
542 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
543
544 spin_lock_irqsave(&par->accept_q_lock, flags);
545 list_del_init(&iucv_sk(sk)->accept_q);
546 spin_unlock_irqrestore(&par->accept_q_lock, flags);
547 sk_acceptq_removed(iucv_sk(sk)->parent);
548 iucv_sk(sk)->parent = NULL;
549 sock_put(sk);
550 }
551
552 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
553 {
554 struct iucv_sock *isk, *n;
555 struct sock *sk;
556
557 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
558 sk = (struct sock *) isk;
559 lock_sock(sk);
560
561 if (sk->sk_state == IUCV_CLOSED) {
562 iucv_accept_unlink(sk);
563 release_sock(sk);
564 continue;
565 }
566
567 if (sk->sk_state == IUCV_CONNECTED ||
568 sk->sk_state == IUCV_SEVERED ||
569 sk->sk_state == IUCV_DISCONN || /* due to PM restore */
570 !newsock) {
571 iucv_accept_unlink(sk);
572 if (newsock)
573 sock_graft(sk, newsock);
574
575 if (sk->sk_state == IUCV_SEVERED)
576 sk->sk_state = IUCV_DISCONN;
577
578 release_sock(sk);
579 return sk;
580 }
581
582 release_sock(sk);
583 }
584 return NULL;
585 }
586
587 /* Bind an unbound socket */
588 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
589 int addr_len)
590 {
591 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
592 struct sock *sk = sock->sk;
593 struct iucv_sock *iucv;
594 int err;
595
596 /* Verify the input sockaddr */
597 if (!addr || addr->sa_family != AF_IUCV)
598 return -EINVAL;
599
600 lock_sock(sk);
601 if (sk->sk_state != IUCV_OPEN) {
602 err = -EBADFD;
603 goto done;
604 }
605
606 write_lock_bh(&iucv_sk_list.lock);
607
608 iucv = iucv_sk(sk);
609 if (__iucv_get_sock_by_name(sa->siucv_name)) {
610 err = -EADDRINUSE;
611 goto done_unlock;
612 }
613 if (iucv->path) {
614 err = 0;
615 goto done_unlock;
616 }
617
618 /* Bind the socket */
619 memcpy(iucv->src_name, sa->siucv_name, 8);
620
621 /* Copy the user id */
622 memcpy(iucv->src_user_id, iucv_userid, 8);
623 sk->sk_state = IUCV_BOUND;
624 err = 0;
625
626 done_unlock:
627 /* Release the socket list lock */
628 write_unlock_bh(&iucv_sk_list.lock);
629 done:
630 release_sock(sk);
631 return err;
632 }
633
634 /* Automatically bind an unbound socket */
635 static int iucv_sock_autobind(struct sock *sk)
636 {
637 struct iucv_sock *iucv = iucv_sk(sk);
638 char query_buffer[80];
639 char name[12];
640 int err = 0;
641
642 /* Set the userid and name */
643 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
644 if (unlikely(err))
645 return -EPROTO;
646
647 memcpy(iucv->src_user_id, query_buffer, 8);
648
649 write_lock_bh(&iucv_sk_list.lock);
650
651 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
652 while (__iucv_get_sock_by_name(name)) {
653 sprintf(name, "%08x",
654 atomic_inc_return(&iucv_sk_list.autobind_name));
655 }
656
657 write_unlock_bh(&iucv_sk_list.lock);
658
659 memcpy(&iucv->src_name, name, 8);
660
661 return err;
662 }
663
664 /* Connect an unconnected socket */
665 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
666 int alen, int flags)
667 {
668 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
669 struct sock *sk = sock->sk;
670 struct iucv_sock *iucv;
671 unsigned char user_data[16];
672 int err;
673
674 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
675 return -EINVAL;
676
677 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
678 return -EBADFD;
679
680 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
681 return -EINVAL;
682
683 if (sk->sk_state == IUCV_OPEN) {
684 err = iucv_sock_autobind(sk);
685 if (unlikely(err))
686 return err;
687 }
688
689 lock_sock(sk);
690
691 /* Set the destination information */
692 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
693 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
694
695 high_nmcpy(user_data, sa->siucv_name);
696 low_nmcpy(user_data, iucv_sk(sk)->src_name);
697 ASCEBC(user_data, sizeof(user_data));
698
699 iucv = iucv_sk(sk);
700 /* Create path. */
701 iucv->path = iucv_path_alloc(iucv->msglimit,
702 IUCV_IPRMDATA, GFP_KERNEL);
703 if (!iucv->path) {
704 err = -ENOMEM;
705 goto done;
706 }
707 err = iucv_path_connect(iucv->path, &af_iucv_handler,
708 sa->siucv_user_id, NULL, user_data, sk);
709 if (err) {
710 iucv_path_free(iucv->path);
711 iucv->path = NULL;
712 switch (err) {
713 case 0x0b: /* Target communicator is not logged on */
714 err = -ENETUNREACH;
715 break;
716 case 0x0d: /* Max connections for this guest exceeded */
717 case 0x0e: /* Max connections for target guest exceeded */
718 err = -EAGAIN;
719 break;
720 case 0x0f: /* Missing IUCV authorization */
721 err = -EACCES;
722 break;
723 default:
724 err = -ECONNREFUSED;
725 break;
726 }
727 goto done;
728 }
729
730 if (sk->sk_state != IUCV_CONNECTED) {
731 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
732 IUCV_DISCONN),
733 sock_sndtimeo(sk, flags & O_NONBLOCK));
734 }
735
736 if (sk->sk_state == IUCV_DISCONN) {
737 err = -ECONNREFUSED;
738 }
739
740 if (err) {
741 iucv_path_sever(iucv->path, NULL);
742 iucv_path_free(iucv->path);
743 iucv->path = NULL;
744 }
745
746 done:
747 release_sock(sk);
748 return err;
749 }
750
751 /* Move a socket into listening state. */
752 static int iucv_sock_listen(struct socket *sock, int backlog)
753 {
754 struct sock *sk = sock->sk;
755 int err;
756
757 lock_sock(sk);
758
759 err = -EINVAL;
760 if (sk->sk_state != IUCV_BOUND)
761 goto done;
762
763 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
764 goto done;
765
766 sk->sk_max_ack_backlog = backlog;
767 sk->sk_ack_backlog = 0;
768 sk->sk_state = IUCV_LISTEN;
769 err = 0;
770
771 done:
772 release_sock(sk);
773 return err;
774 }
775
776 /* Accept a pending connection */
777 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
778 int flags)
779 {
780 DECLARE_WAITQUEUE(wait, current);
781 struct sock *sk = sock->sk, *nsk;
782 long timeo;
783 int err = 0;
784
785 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
786
787 if (sk->sk_state != IUCV_LISTEN) {
788 err = -EBADFD;
789 goto done;
790 }
791
792 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
793
794 /* Wait for an incoming connection */
795 add_wait_queue_exclusive(sk_sleep(sk), &wait);
796 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
797 set_current_state(TASK_INTERRUPTIBLE);
798 if (!timeo) {
799 err = -EAGAIN;
800 break;
801 }
802
803 release_sock(sk);
804 timeo = schedule_timeout(timeo);
805 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
806
807 if (sk->sk_state != IUCV_LISTEN) {
808 err = -EBADFD;
809 break;
810 }
811
812 if (signal_pending(current)) {
813 err = sock_intr_errno(timeo);
814 break;
815 }
816 }
817
818 set_current_state(TASK_RUNNING);
819 remove_wait_queue(sk_sleep(sk), &wait);
820
821 if (err)
822 goto done;
823
824 newsock->state = SS_CONNECTED;
825
826 done:
827 release_sock(sk);
828 return err;
829 }
830
831 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
832 int *len, int peer)
833 {
834 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
835 struct sock *sk = sock->sk;
836
837 addr->sa_family = AF_IUCV;
838 *len = sizeof(struct sockaddr_iucv);
839
840 if (peer) {
841 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
842 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
843 } else {
844 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
845 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
846 }
847 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
848 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
849 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
850
851 return 0;
852 }
853
854 /**
855 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
856 * @path: IUCV path
857 * @msg: Pointer to a struct iucv_message
858 * @skb: The socket data to send, skb->len MUST BE <= 7
859 *
860 * Send the socket data in the parameter list in the iucv message
861 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
862 * list and the socket data len at index 7 (last byte).
863 * See also iucv_msg_length().
864 *
865 * Returns the error code from the iucv_message_send() call.
866 */
867 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
868 struct sk_buff *skb)
869 {
870 u8 prmdata[8];
871
872 memcpy(prmdata, (void *) skb->data, skb->len);
873 prmdata[7] = 0xff - (u8) skb->len;
874 return iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
875 (void *) prmdata, 8);
876 }
877
878 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
879 struct msghdr *msg, size_t len)
880 {
881 struct sock *sk = sock->sk;
882 struct iucv_sock *iucv = iucv_sk(sk);
883 struct sk_buff *skb;
884 struct iucv_message txmsg;
885 struct cmsghdr *cmsg;
886 int cmsg_done;
887 long timeo;
888 char user_id[9];
889 char appl_id[9];
890 int err;
891 int noblock = msg->msg_flags & MSG_DONTWAIT;
892
893 err = sock_error(sk);
894 if (err)
895 return err;
896
897 if (msg->msg_flags & MSG_OOB)
898 return -EOPNOTSUPP;
899
900 /* SOCK_SEQPACKET: we do not support segmented records */
901 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
902 return -EOPNOTSUPP;
903
904 lock_sock(sk);
905
906 if (sk->sk_shutdown & SEND_SHUTDOWN) {
907 err = -EPIPE;
908 goto out;
909 }
910
911 /* Return if the socket is not in connected state */
912 if (sk->sk_state != IUCV_CONNECTED) {
913 err = -ENOTCONN;
914 goto out;
915 }
916
917 /* initialize defaults */
918 cmsg_done = 0; /* check for duplicate headers */
919 txmsg.class = 0;
920
921 /* iterate over control messages */
922 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
923 cmsg = CMSG_NXTHDR(msg, cmsg)) {
924
925 if (!CMSG_OK(msg, cmsg)) {
926 err = -EINVAL;
927 goto out;
928 }
929
930 if (cmsg->cmsg_level != SOL_IUCV)
931 continue;
932
933 if (cmsg->cmsg_type & cmsg_done) {
934 err = -EINVAL;
935 goto out;
936 }
937 cmsg_done |= cmsg->cmsg_type;
938
939 switch (cmsg->cmsg_type) {
940 case SCM_IUCV_TRGCLS:
941 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
942 err = -EINVAL;
943 goto out;
944 }
945
946 /* set iucv message target class */
947 memcpy(&txmsg.class,
948 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
949
950 break;
951
952 default:
953 err = -EINVAL;
954 goto out;
955 break;
956 }
957 }
958
959 /* allocate one skb for each iucv message:
960 * this is fine for SOCK_SEQPACKET (unless we want to support
961 * segmented records using the MSG_EOR flag), but
962 * for SOCK_STREAM we might want to improve it in future */
963 skb = sock_alloc_send_skb(sk, len, noblock, &err);
964 if (!skb)
965 goto out;
966 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
967 err = -EFAULT;
968 goto fail;
969 }
970
971 /* wait if outstanding messages for iucv path has reached */
972 timeo = sock_sndtimeo(sk, noblock);
973 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
974 if (err)
975 goto fail;
976
977 /* return -ECONNRESET if the socket is no longer connected */
978 if (sk->sk_state != IUCV_CONNECTED) {
979 err = -ECONNRESET;
980 goto fail;
981 }
982
983 /* increment and save iucv message tag for msg_completion cbk */
984 txmsg.tag = iucv->send_tag++;
985 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
986 skb_queue_tail(&iucv->send_skb_q, skb);
987
988 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
989 && skb->len <= 7) {
990 err = iucv_send_iprm(iucv->path, &txmsg, skb);
991
992 /* on success: there is no message_complete callback
993 * for an IPRMDATA msg; remove skb from send queue */
994 if (err == 0) {
995 skb_unlink(skb, &iucv->send_skb_q);
996 kfree_skb(skb);
997 }
998
999 /* this error should never happen since the
1000 * IUCV_IPRMDATA path flag is set... sever path */
1001 if (err == 0x15) {
1002 iucv_path_sever(iucv->path, NULL);
1003 skb_unlink(skb, &iucv->send_skb_q);
1004 err = -EPIPE;
1005 goto fail;
1006 }
1007 } else
1008 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
1009 (void *) skb->data, skb->len);
1010 if (err) {
1011 if (err == 3) {
1012 user_id[8] = 0;
1013 memcpy(user_id, iucv->dst_user_id, 8);
1014 appl_id[8] = 0;
1015 memcpy(appl_id, iucv->dst_name, 8);
1016 pr_err("Application %s on z/VM guest %s"
1017 " exceeds message limit\n",
1018 appl_id, user_id);
1019 err = -EAGAIN;
1020 } else
1021 err = -EPIPE;
1022 skb_unlink(skb, &iucv->send_skb_q);
1023 goto fail;
1024 }
1025
1026 release_sock(sk);
1027 return len;
1028
1029 fail:
1030 kfree_skb(skb);
1031 out:
1032 release_sock(sk);
1033 return err;
1034 }
1035
1036 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1037 *
1038 * Locking: must be called with message_q.lock held
1039 */
1040 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1041 {
1042 int dataleft, size, copied = 0;
1043 struct sk_buff *nskb;
1044
1045 dataleft = len;
1046 while (dataleft) {
1047 if (dataleft >= sk->sk_rcvbuf / 4)
1048 size = sk->sk_rcvbuf / 4;
1049 else
1050 size = dataleft;
1051
1052 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1053 if (!nskb)
1054 return -ENOMEM;
1055
1056 /* copy target class to control buffer of new skb */
1057 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1058
1059 /* copy data fragment */
1060 memcpy(nskb->data, skb->data + copied, size);
1061 copied += size;
1062 dataleft -= size;
1063
1064 skb_reset_transport_header(nskb);
1065 skb_reset_network_header(nskb);
1066 nskb->len = size;
1067
1068 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1069 }
1070
1071 return 0;
1072 }
1073
1074 /* iucv_process_message() - Receive a single outstanding IUCV message
1075 *
1076 * Locking: must be called with message_q.lock held
1077 */
1078 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1079 struct iucv_path *path,
1080 struct iucv_message *msg)
1081 {
1082 int rc;
1083 unsigned int len;
1084
1085 len = iucv_msg_length(msg);
1086
1087 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1088 /* Note: the first 4 bytes are reserved for msg tag */
1089 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1090
1091 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1092 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1093 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1094 skb->data = NULL;
1095 skb->len = 0;
1096 }
1097 } else {
1098 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
1099 skb->data, len, NULL);
1100 if (rc) {
1101 kfree_skb(skb);
1102 return;
1103 }
1104 /* we need to fragment iucv messages for SOCK_STREAM only;
1105 * for SOCK_SEQPACKET, it is only relevant if we support
1106 * record segmentation using MSG_EOR (see also recvmsg()) */
1107 if (sk->sk_type == SOCK_STREAM &&
1108 skb->truesize >= sk->sk_rcvbuf / 4) {
1109 rc = iucv_fragment_skb(sk, skb, len);
1110 kfree_skb(skb);
1111 skb = NULL;
1112 if (rc) {
1113 iucv_path_sever(path, NULL);
1114 return;
1115 }
1116 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1117 } else {
1118 skb_reset_transport_header(skb);
1119 skb_reset_network_header(skb);
1120 skb->len = len;
1121 }
1122 }
1123
1124 if (sock_queue_rcv_skb(sk, skb))
1125 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1126 }
1127
1128 /* iucv_process_message_q() - Process outstanding IUCV messages
1129 *
1130 * Locking: must be called with message_q.lock held
1131 */
1132 static void iucv_process_message_q(struct sock *sk)
1133 {
1134 struct iucv_sock *iucv = iucv_sk(sk);
1135 struct sk_buff *skb;
1136 struct sock_msg_q *p, *n;
1137
1138 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1139 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1140 if (!skb)
1141 break;
1142 iucv_process_message(sk, skb, p->path, &p->msg);
1143 list_del(&p->list);
1144 kfree(p);
1145 if (!skb_queue_empty(&iucv->backlog_skb_q))
1146 break;
1147 }
1148 }
1149
1150 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1151 struct msghdr *msg, size_t len, int flags)
1152 {
1153 int noblock = flags & MSG_DONTWAIT;
1154 struct sock *sk = sock->sk;
1155 struct iucv_sock *iucv = iucv_sk(sk);
1156 unsigned int copied, rlen;
1157 struct sk_buff *skb, *rskb, *cskb;
1158 int err = 0;
1159
1160 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
1161 skb_queue_empty(&iucv->backlog_skb_q) &&
1162 skb_queue_empty(&sk->sk_receive_queue) &&
1163 list_empty(&iucv->message_q.list))
1164 return 0;
1165
1166 if (flags & (MSG_OOB))
1167 return -EOPNOTSUPP;
1168
1169 /* receive/dequeue next skb:
1170 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1171 skb = skb_recv_datagram(sk, flags, noblock, &err);
1172 if (!skb) {
1173 if (sk->sk_shutdown & RCV_SHUTDOWN)
1174 return 0;
1175 return err;
1176 }
1177
1178 rlen = skb->len; /* real length of skb */
1179 copied = min_t(unsigned int, rlen, len);
1180
1181 cskb = skb;
1182 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
1183 if (!(flags & MSG_PEEK))
1184 skb_queue_head(&sk->sk_receive_queue, skb);
1185 return -EFAULT;
1186 }
1187
1188 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1189 if (sk->sk_type == SOCK_SEQPACKET) {
1190 if (copied < rlen)
1191 msg->msg_flags |= MSG_TRUNC;
1192 /* each iucv message contains a complete record */
1193 msg->msg_flags |= MSG_EOR;
1194 }
1195
1196 /* create control message to store iucv msg target class:
1197 * get the trgcls from the control buffer of the skb due to
1198 * fragmentation of original iucv message. */
1199 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1200 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1201 if (err) {
1202 if (!(flags & MSG_PEEK))
1203 skb_queue_head(&sk->sk_receive_queue, skb);
1204 return err;
1205 }
1206
1207 /* Mark read part of skb as used */
1208 if (!(flags & MSG_PEEK)) {
1209
1210 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1211 if (sk->sk_type == SOCK_STREAM) {
1212 skb_pull(skb, copied);
1213 if (skb->len) {
1214 skb_queue_head(&sk->sk_receive_queue, skb);
1215 goto done;
1216 }
1217 }
1218
1219 kfree_skb(skb);
1220
1221 /* Queue backlog skbs */
1222 spin_lock_bh(&iucv->message_q.lock);
1223 rskb = skb_dequeue(&iucv->backlog_skb_q);
1224 while (rskb) {
1225 if (sock_queue_rcv_skb(sk, rskb)) {
1226 skb_queue_head(&iucv->backlog_skb_q,
1227 rskb);
1228 break;
1229 } else {
1230 rskb = skb_dequeue(&iucv->backlog_skb_q);
1231 }
1232 }
1233 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1234 if (!list_empty(&iucv->message_q.list))
1235 iucv_process_message_q(sk);
1236 }
1237 spin_unlock_bh(&iucv->message_q.lock);
1238 }
1239
1240 done:
1241 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1242 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1243 copied = rlen;
1244
1245 return copied;
1246 }
1247
1248 static inline unsigned int iucv_accept_poll(struct sock *parent)
1249 {
1250 struct iucv_sock *isk, *n;
1251 struct sock *sk;
1252
1253 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1254 sk = (struct sock *) isk;
1255
1256 if (sk->sk_state == IUCV_CONNECTED)
1257 return POLLIN | POLLRDNORM;
1258 }
1259
1260 return 0;
1261 }
1262
1263 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1264 poll_table *wait)
1265 {
1266 struct sock *sk = sock->sk;
1267 unsigned int mask = 0;
1268
1269 sock_poll_wait(file, sk_sleep(sk), wait);
1270
1271 if (sk->sk_state == IUCV_LISTEN)
1272 return iucv_accept_poll(sk);
1273
1274 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1275 mask |= POLLERR;
1276
1277 if (sk->sk_shutdown & RCV_SHUTDOWN)
1278 mask |= POLLRDHUP;
1279
1280 if (sk->sk_shutdown == SHUTDOWN_MASK)
1281 mask |= POLLHUP;
1282
1283 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1284 (sk->sk_shutdown & RCV_SHUTDOWN))
1285 mask |= POLLIN | POLLRDNORM;
1286
1287 if (sk->sk_state == IUCV_CLOSED)
1288 mask |= POLLHUP;
1289
1290 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
1291 mask |= POLLIN;
1292
1293 if (sock_writeable(sk))
1294 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1295 else
1296 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1297
1298 return mask;
1299 }
1300
1301 static int iucv_sock_shutdown(struct socket *sock, int how)
1302 {
1303 struct sock *sk = sock->sk;
1304 struct iucv_sock *iucv = iucv_sk(sk);
1305 struct iucv_message txmsg;
1306 int err = 0;
1307
1308 how++;
1309
1310 if ((how & ~SHUTDOWN_MASK) || !how)
1311 return -EINVAL;
1312
1313 lock_sock(sk);
1314 switch (sk->sk_state) {
1315 case IUCV_DISCONN:
1316 case IUCV_CLOSING:
1317 case IUCV_SEVERED:
1318 case IUCV_CLOSED:
1319 err = -ENOTCONN;
1320 goto fail;
1321
1322 default:
1323 sk->sk_shutdown |= how;
1324 break;
1325 }
1326
1327 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1328 txmsg.class = 0;
1329 txmsg.tag = 0;
1330 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
1331 (void *) iprm_shutdown, 8);
1332 if (err) {
1333 switch (err) {
1334 case 1:
1335 err = -ENOTCONN;
1336 break;
1337 case 2:
1338 err = -ECONNRESET;
1339 break;
1340 default:
1341 err = -ENOTCONN;
1342 break;
1343 }
1344 }
1345 }
1346
1347 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1348 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
1349 if (err)
1350 err = -ENOTCONN;
1351
1352 skb_queue_purge(&sk->sk_receive_queue);
1353 }
1354
1355 /* Wake up anyone sleeping in poll */
1356 sk->sk_state_change(sk);
1357
1358 fail:
1359 release_sock(sk);
1360 return err;
1361 }
1362
1363 static int iucv_sock_release(struct socket *sock)
1364 {
1365 struct sock *sk = sock->sk;
1366 int err = 0;
1367
1368 if (!sk)
1369 return 0;
1370
1371 iucv_sock_close(sk);
1372
1373 /* Unregister with IUCV base support */
1374 if (iucv_sk(sk)->path) {
1375 iucv_path_sever(iucv_sk(sk)->path, NULL);
1376 iucv_path_free(iucv_sk(sk)->path);
1377 iucv_sk(sk)->path = NULL;
1378 }
1379
1380 sock_orphan(sk);
1381 iucv_sock_kill(sk);
1382 return err;
1383 }
1384
1385 /* getsockopt and setsockopt */
1386 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1387 char __user *optval, unsigned int optlen)
1388 {
1389 struct sock *sk = sock->sk;
1390 struct iucv_sock *iucv = iucv_sk(sk);
1391 int val;
1392 int rc;
1393
1394 if (level != SOL_IUCV)
1395 return -ENOPROTOOPT;
1396
1397 if (optlen < sizeof(int))
1398 return -EINVAL;
1399
1400 if (get_user(val, (int __user *) optval))
1401 return -EFAULT;
1402
1403 rc = 0;
1404
1405 lock_sock(sk);
1406 switch (optname) {
1407 case SO_IPRMDATA_MSG:
1408 if (val)
1409 iucv->flags |= IUCV_IPRMDATA;
1410 else
1411 iucv->flags &= ~IUCV_IPRMDATA;
1412 break;
1413 case SO_MSGLIMIT:
1414 switch (sk->sk_state) {
1415 case IUCV_OPEN:
1416 case IUCV_BOUND:
1417 if (val < 1 || val > (u16)(~0))
1418 rc = -EINVAL;
1419 else
1420 iucv->msglimit = val;
1421 break;
1422 default:
1423 rc = -EINVAL;
1424 break;
1425 }
1426 break;
1427 default:
1428 rc = -ENOPROTOOPT;
1429 break;
1430 }
1431 release_sock(sk);
1432
1433 return rc;
1434 }
1435
1436 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1437 char __user *optval, int __user *optlen)
1438 {
1439 struct sock *sk = sock->sk;
1440 struct iucv_sock *iucv = iucv_sk(sk);
1441 int val, len;
1442
1443 if (level != SOL_IUCV)
1444 return -ENOPROTOOPT;
1445
1446 if (get_user(len, optlen))
1447 return -EFAULT;
1448
1449 if (len < 0)
1450 return -EINVAL;
1451
1452 len = min_t(unsigned int, len, sizeof(int));
1453
1454 switch (optname) {
1455 case SO_IPRMDATA_MSG:
1456 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1457 break;
1458 case SO_MSGLIMIT:
1459 lock_sock(sk);
1460 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1461 : iucv->msglimit; /* default */
1462 release_sock(sk);
1463 break;
1464 default:
1465 return -ENOPROTOOPT;
1466 }
1467
1468 if (put_user(len, optlen))
1469 return -EFAULT;
1470 if (copy_to_user(optval, &val, len))
1471 return -EFAULT;
1472
1473 return 0;
1474 }
1475
1476
1477 /* Callback wrappers - called from iucv base support */
1478 static int iucv_callback_connreq(struct iucv_path *path,
1479 u8 ipvmid[8], u8 ipuser[16])
1480 {
1481 unsigned char user_data[16];
1482 unsigned char nuser_data[16];
1483 unsigned char src_name[8];
1484 struct hlist_node *node;
1485 struct sock *sk, *nsk;
1486 struct iucv_sock *iucv, *niucv;
1487 int err;
1488
1489 memcpy(src_name, ipuser, 8);
1490 EBCASC(src_name, 8);
1491 /* Find out if this path belongs to af_iucv. */
1492 read_lock(&iucv_sk_list.lock);
1493 iucv = NULL;
1494 sk = NULL;
1495 sk_for_each(sk, node, &iucv_sk_list.head)
1496 if (sk->sk_state == IUCV_LISTEN &&
1497 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1498 /*
1499 * Found a listening socket with
1500 * src_name == ipuser[0-7].
1501 */
1502 iucv = iucv_sk(sk);
1503 break;
1504 }
1505 read_unlock(&iucv_sk_list.lock);
1506 if (!iucv)
1507 /* No socket found, not one of our paths. */
1508 return -EINVAL;
1509
1510 bh_lock_sock(sk);
1511
1512 /* Check if parent socket is listening */
1513 low_nmcpy(user_data, iucv->src_name);
1514 high_nmcpy(user_data, iucv->dst_name);
1515 ASCEBC(user_data, sizeof(user_data));
1516 if (sk->sk_state != IUCV_LISTEN) {
1517 err = iucv_path_sever(path, user_data);
1518 iucv_path_free(path);
1519 goto fail;
1520 }
1521
1522 /* Check for backlog size */
1523 if (sk_acceptq_is_full(sk)) {
1524 err = iucv_path_sever(path, user_data);
1525 iucv_path_free(path);
1526 goto fail;
1527 }
1528
1529 /* Create the new socket */
1530 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1531 if (!nsk) {
1532 err = iucv_path_sever(path, user_data);
1533 iucv_path_free(path);
1534 goto fail;
1535 }
1536
1537 niucv = iucv_sk(nsk);
1538 iucv_sock_init(nsk, sk);
1539
1540 /* Set the new iucv_sock */
1541 memcpy(niucv->dst_name, ipuser + 8, 8);
1542 EBCASC(niucv->dst_name, 8);
1543 memcpy(niucv->dst_user_id, ipvmid, 8);
1544 memcpy(niucv->src_name, iucv->src_name, 8);
1545 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1546 niucv->path = path;
1547
1548 /* Call iucv_accept */
1549 high_nmcpy(nuser_data, ipuser + 8);
1550 memcpy(nuser_data + 8, niucv->src_name, 8);
1551 ASCEBC(nuser_data + 8, 8);
1552
1553 /* set message limit for path based on msglimit of accepting socket */
1554 niucv->msglimit = iucv->msglimit;
1555 path->msglim = iucv->msglimit;
1556 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1557 if (err) {
1558 err = iucv_path_sever(path, user_data);
1559 iucv_path_free(path);
1560 iucv_sock_kill(nsk);
1561 goto fail;
1562 }
1563
1564 iucv_accept_enqueue(sk, nsk);
1565
1566 /* Wake up accept */
1567 nsk->sk_state = IUCV_CONNECTED;
1568 sk->sk_data_ready(sk, 1);
1569 err = 0;
1570 fail:
1571 bh_unlock_sock(sk);
1572 return 0;
1573 }
1574
1575 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1576 {
1577 struct sock *sk = path->private;
1578
1579 sk->sk_state = IUCV_CONNECTED;
1580 sk->sk_state_change(sk);
1581 }
1582
1583 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1584 {
1585 struct sock *sk = path->private;
1586 struct iucv_sock *iucv = iucv_sk(sk);
1587 struct sk_buff *skb;
1588 struct sock_msg_q *save_msg;
1589 int len;
1590
1591 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1592 iucv_message_reject(path, msg);
1593 return;
1594 }
1595
1596 spin_lock(&iucv->message_q.lock);
1597
1598 if (!list_empty(&iucv->message_q.list) ||
1599 !skb_queue_empty(&iucv->backlog_skb_q))
1600 goto save_message;
1601
1602 len = atomic_read(&sk->sk_rmem_alloc);
1603 len += iucv_msg_length(msg) + sizeof(struct sk_buff);
1604 if (len > sk->sk_rcvbuf)
1605 goto save_message;
1606
1607 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1608 if (!skb)
1609 goto save_message;
1610
1611 iucv_process_message(sk, skb, path, msg);
1612 goto out_unlock;
1613
1614 save_message:
1615 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1616 if (!save_msg)
1617 goto out_unlock;
1618 save_msg->path = path;
1619 save_msg->msg = *msg;
1620
1621 list_add_tail(&save_msg->list, &iucv->message_q.list);
1622
1623 out_unlock:
1624 spin_unlock(&iucv->message_q.lock);
1625 }
1626
1627 static void iucv_callback_txdone(struct iucv_path *path,
1628 struct iucv_message *msg)
1629 {
1630 struct sock *sk = path->private;
1631 struct sk_buff *this = NULL;
1632 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1633 struct sk_buff *list_skb = list->next;
1634 unsigned long flags;
1635
1636 if (!skb_queue_empty(list)) {
1637 spin_lock_irqsave(&list->lock, flags);
1638
1639 while (list_skb != (struct sk_buff *)list) {
1640 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1641 this = list_skb;
1642 break;
1643 }
1644 list_skb = list_skb->next;
1645 }
1646 if (this)
1647 __skb_unlink(this, list);
1648
1649 spin_unlock_irqrestore(&list->lock, flags);
1650
1651 if (this) {
1652 kfree_skb(this);
1653 /* wake up any process waiting for sending */
1654 iucv_sock_wake_msglim(sk);
1655 }
1656 }
1657 BUG_ON(!this);
1658
1659 if (sk->sk_state == IUCV_CLOSING) {
1660 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1661 sk->sk_state = IUCV_CLOSED;
1662 sk->sk_state_change(sk);
1663 }
1664 }
1665
1666 }
1667
1668 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1669 {
1670 struct sock *sk = path->private;
1671
1672 if (!list_empty(&iucv_sk(sk)->accept_q))
1673 sk->sk_state = IUCV_SEVERED;
1674 else
1675 sk->sk_state = IUCV_DISCONN;
1676
1677 sk->sk_state_change(sk);
1678 }
1679
1680 /* called if the other communication side shuts down its RECV direction;
1681 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1682 */
1683 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1684 {
1685 struct sock *sk = path->private;
1686
1687 bh_lock_sock(sk);
1688 if (sk->sk_state != IUCV_CLOSED) {
1689 sk->sk_shutdown |= SEND_SHUTDOWN;
1690 sk->sk_state_change(sk);
1691 }
1692 bh_unlock_sock(sk);
1693 }
1694
1695 static const struct proto_ops iucv_sock_ops = {
1696 .family = PF_IUCV,
1697 .owner = THIS_MODULE,
1698 .release = iucv_sock_release,
1699 .bind = iucv_sock_bind,
1700 .connect = iucv_sock_connect,
1701 .listen = iucv_sock_listen,
1702 .accept = iucv_sock_accept,
1703 .getname = iucv_sock_getname,
1704 .sendmsg = iucv_sock_sendmsg,
1705 .recvmsg = iucv_sock_recvmsg,
1706 .poll = iucv_sock_poll,
1707 .ioctl = sock_no_ioctl,
1708 .mmap = sock_no_mmap,
1709 .socketpair = sock_no_socketpair,
1710 .shutdown = iucv_sock_shutdown,
1711 .setsockopt = iucv_sock_setsockopt,
1712 .getsockopt = iucv_sock_getsockopt,
1713 };
1714
1715 static const struct net_proto_family iucv_sock_family_ops = {
1716 .family = AF_IUCV,
1717 .owner = THIS_MODULE,
1718 .create = iucv_sock_create,
1719 };
1720
1721 static int __init afiucv_init(void)
1722 {
1723 int err;
1724
1725 if (!MACHINE_IS_VM) {
1726 pr_err("The af_iucv module cannot be loaded"
1727 " without z/VM\n");
1728 err = -EPROTONOSUPPORT;
1729 goto out;
1730 }
1731 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1732 if (unlikely(err)) {
1733 WARN_ON(err);
1734 err = -EPROTONOSUPPORT;
1735 goto out;
1736 }
1737
1738 err = iucv_register(&af_iucv_handler, 0);
1739 if (err)
1740 goto out;
1741 err = proto_register(&iucv_proto, 0);
1742 if (err)
1743 goto out_iucv;
1744 err = sock_register(&iucv_sock_family_ops);
1745 if (err)
1746 goto out_proto;
1747 /* establish dummy device */
1748 err = driver_register(&af_iucv_driver);
1749 if (err)
1750 goto out_sock;
1751 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
1752 if (!af_iucv_dev) {
1753 err = -ENOMEM;
1754 goto out_driver;
1755 }
1756 dev_set_name(af_iucv_dev, "af_iucv");
1757 af_iucv_dev->bus = &iucv_bus;
1758 af_iucv_dev->parent = iucv_root;
1759 af_iucv_dev->release = (void (*)(struct device *))kfree;
1760 af_iucv_dev->driver = &af_iucv_driver;
1761 err = device_register(af_iucv_dev);
1762 if (err)
1763 goto out_driver;
1764
1765 return 0;
1766
1767 out_driver:
1768 driver_unregister(&af_iucv_driver);
1769 out_sock:
1770 sock_unregister(PF_IUCV);
1771 out_proto:
1772 proto_unregister(&iucv_proto);
1773 out_iucv:
1774 iucv_unregister(&af_iucv_handler, 0);
1775 out:
1776 return err;
1777 }
1778
1779 static void __exit afiucv_exit(void)
1780 {
1781 device_unregister(af_iucv_dev);
1782 driver_unregister(&af_iucv_driver);
1783 sock_unregister(PF_IUCV);
1784 proto_unregister(&iucv_proto);
1785 iucv_unregister(&af_iucv_handler, 0);
1786 }
1787
1788 module_init(afiucv_init);
1789 module_exit(afiucv_exit);
1790
1791 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1792 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1793 MODULE_VERSION(VERSION);
1794 MODULE_LICENSE("GPL");
1795 MODULE_ALIAS_NETPROTO(PF_IUCV);
x86 "subsystem" repository