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wpan-phy: init channel/page fields
[deliverable/linux.git] / net / iucv / af_iucv.c
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->sk_sleep, &__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->sk_sleep, &__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 return;
140 }
141
142 /**
143 * afiucv_pm_freeze() - Freeze PM callback
144 * @dev: AFIUCV dummy device
145 *
146 * Sever all established IUCV communication pathes
147 */
148 static int afiucv_pm_freeze(struct device *dev)
149 {
150 struct iucv_sock *iucv;
151 struct sock *sk;
152 struct hlist_node *node;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, node, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 skb_queue_purge(&iucv->send_skb_q);
162 skb_queue_purge(&iucv->backlog_skb_q);
163 switch (sk->sk_state) {
164 case IUCV_SEVERED:
165 case IUCV_DISCONN:
166 case IUCV_CLOSING:
167 case IUCV_CONNECTED:
168 if (iucv->path) {
169 err = iucv_path_sever(iucv->path, NULL);
170 iucv_path_free(iucv->path);
171 iucv->path = NULL;
172 }
173 break;
174 case IUCV_OPEN:
175 case IUCV_BOUND:
176 case IUCV_LISTEN:
177 case IUCV_CLOSED:
178 default:
179 break;
180 }
181 }
182 read_unlock(&iucv_sk_list.lock);
183 return err;
184 }
185
186 /**
187 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
188 * @dev: AFIUCV dummy device
189 *
190 * socket clean up after freeze
191 */
192 static int afiucv_pm_restore_thaw(struct device *dev)
193 {
194 struct iucv_sock *iucv;
195 struct sock *sk;
196 struct hlist_node *node;
197
198 #ifdef CONFIG_PM_DEBUG
199 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
200 #endif
201 read_lock(&iucv_sk_list.lock);
202 sk_for_each(sk, node, &iucv_sk_list.head) {
203 iucv = iucv_sk(sk);
204 switch (sk->sk_state) {
205 case IUCV_CONNECTED:
206 sk->sk_err = EPIPE;
207 sk->sk_state = IUCV_DISCONN;
208 sk->sk_state_change(sk);
209 break;
210 case IUCV_DISCONN:
211 case IUCV_SEVERED:
212 case IUCV_CLOSING:
213 case IUCV_LISTEN:
214 case IUCV_BOUND:
215 case IUCV_OPEN:
216 default:
217 break;
218 }
219 }
220 read_unlock(&iucv_sk_list.lock);
221 return 0;
222 }
223
224 static struct dev_pm_ops afiucv_pm_ops = {
225 .prepare = afiucv_pm_prepare,
226 .complete = afiucv_pm_complete,
227 .freeze = afiucv_pm_freeze,
228 .thaw = afiucv_pm_restore_thaw,
229 .restore = afiucv_pm_restore_thaw,
230 };
231
232 static struct device_driver af_iucv_driver = {
233 .owner = THIS_MODULE,
234 .name = "afiucv",
235 .bus = &iucv_bus,
236 .pm = &afiucv_pm_ops,
237 };
238
239 /* dummy device used as trigger for PM functions */
240 static struct device *af_iucv_dev;
241
242 /**
243 * iucv_msg_length() - Returns the length of an iucv message.
244 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
245 *
246 * The function returns the length of the specified iucv message @msg of data
247 * stored in a buffer and of data stored in the parameter list (PRMDATA).
248 *
249 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
250 * data:
251 * PRMDATA[0..6] socket data (max 7 bytes);
252 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
253 *
254 * The socket data length is computed by substracting the socket data length
255 * value from 0xFF.
256 * If the socket data len is greater 7, then PRMDATA can be used for special
257 * notifications (see iucv_sock_shutdown); and further,
258 * if the socket data len is > 7, the function returns 8.
259 *
260 * Use this function to allocate socket buffers to store iucv message data.
261 */
262 static inline size_t iucv_msg_length(struct iucv_message *msg)
263 {
264 size_t datalen;
265
266 if (msg->flags & IUCV_IPRMDATA) {
267 datalen = 0xff - msg->rmmsg[7];
268 return (datalen < 8) ? datalen : 8;
269 }
270 return msg->length;
271 }
272
273 /**
274 * iucv_sock_in_state() - check for specific states
275 * @sk: sock structure
276 * @state: first iucv sk state
277 * @state: second iucv sk state
278 *
279 * Returns true if the socket in either in the first or second state.
280 */
281 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
282 {
283 return (sk->sk_state == state || sk->sk_state == state2);
284 }
285
286 /**
287 * iucv_below_msglim() - function to check if messages can be sent
288 * @sk: sock structure
289 *
290 * Returns true if the send queue length is lower than the message limit.
291 * Always returns true if the socket is not connected (no iucv path for
292 * checking the message limit).
293 */
294 static inline int iucv_below_msglim(struct sock *sk)
295 {
296 struct iucv_sock *iucv = iucv_sk(sk);
297
298 if (sk->sk_state != IUCV_CONNECTED)
299 return 1;
300 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
301 }
302
303 /**
304 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
305 */
306 static void iucv_sock_wake_msglim(struct sock *sk)
307 {
308 read_lock(&sk->sk_callback_lock);
309 if (sk_has_sleeper(sk))
310 wake_up_interruptible_all(sk->sk_sleep);
311 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
312 read_unlock(&sk->sk_callback_lock);
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 int err;
383 unsigned long timeo;
384
385 iucv_sock_clear_timer(sk);
386 lock_sock(sk);
387
388 switch (sk->sk_state) {
389 case IUCV_LISTEN:
390 iucv_sock_cleanup_listen(sk);
391 break;
392
393 case IUCV_CONNECTED:
394 case IUCV_DISCONN:
395 err = 0;
396
397 sk->sk_state = IUCV_CLOSING;
398 sk->sk_state_change(sk);
399
400 if (!skb_queue_empty(&iucv->send_skb_q)) {
401 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
402 timeo = sk->sk_lingertime;
403 else
404 timeo = IUCV_DISCONN_TIMEOUT;
405 err = iucv_sock_wait(sk,
406 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
407 timeo);
408 }
409
410 case IUCV_CLOSING: /* fall through */
411 sk->sk_state = IUCV_CLOSED;
412 sk->sk_state_change(sk);
413
414 if (iucv->path) {
415 low_nmcpy(user_data, iucv->src_name);
416 high_nmcpy(user_data, iucv->dst_name);
417 ASCEBC(user_data, sizeof(user_data));
418 err = iucv_path_sever(iucv->path, user_data);
419 iucv_path_free(iucv->path);
420 iucv->path = NULL;
421 }
422
423 sk->sk_err = ECONNRESET;
424 sk->sk_state_change(sk);
425
426 skb_queue_purge(&iucv->send_skb_q);
427 skb_queue_purge(&iucv->backlog_skb_q);
428 break;
429
430 default:
431 /* nothing to do here */
432 break;
433 }
434
435 /* mark socket for deletion by iucv_sock_kill() */
436 sock_set_flag(sk, SOCK_ZAPPED);
437
438 release_sock(sk);
439 }
440
441 static void iucv_sock_init(struct sock *sk, struct sock *parent)
442 {
443 if (parent)
444 sk->sk_type = parent->sk_type;
445 }
446
447 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
448 {
449 struct sock *sk;
450
451 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
452 if (!sk)
453 return NULL;
454
455 sock_init_data(sock, sk);
456 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
457 spin_lock_init(&iucv_sk(sk)->accept_q_lock);
458 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
459 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
460 spin_lock_init(&iucv_sk(sk)->message_q.lock);
461 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
462 iucv_sk(sk)->send_tag = 0;
463 iucv_sk(sk)->flags = 0;
464 iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT;
465 iucv_sk(sk)->path = NULL;
466 memset(&iucv_sk(sk)->src_user_id , 0, 32);
467
468 sk->sk_destruct = iucv_sock_destruct;
469 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
470 sk->sk_allocation = GFP_DMA;
471
472 sock_reset_flag(sk, SOCK_ZAPPED);
473
474 sk->sk_protocol = proto;
475 sk->sk_state = IUCV_OPEN;
476
477 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
478
479 iucv_sock_link(&iucv_sk_list, sk);
480 return sk;
481 }
482
483 /* Create an IUCV socket */
484 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
485 {
486 struct sock *sk;
487
488 if (protocol && protocol != PF_IUCV)
489 return -EPROTONOSUPPORT;
490
491 sock->state = SS_UNCONNECTED;
492
493 switch (sock->type) {
494 case SOCK_STREAM:
495 sock->ops = &iucv_sock_ops;
496 break;
497 case SOCK_SEQPACKET:
498 /* currently, proto ops can handle both sk types */
499 sock->ops = &iucv_sock_ops;
500 break;
501 default:
502 return -ESOCKTNOSUPPORT;
503 }
504
505 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
506 if (!sk)
507 return -ENOMEM;
508
509 iucv_sock_init(sk, NULL);
510
511 return 0;
512 }
513
514 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
515 {
516 write_lock_bh(&l->lock);
517 sk_add_node(sk, &l->head);
518 write_unlock_bh(&l->lock);
519 }
520
521 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
522 {
523 write_lock_bh(&l->lock);
524 sk_del_node_init(sk);
525 write_unlock_bh(&l->lock);
526 }
527
528 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
529 {
530 unsigned long flags;
531 struct iucv_sock *par = iucv_sk(parent);
532
533 sock_hold(sk);
534 spin_lock_irqsave(&par->accept_q_lock, flags);
535 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
536 spin_unlock_irqrestore(&par->accept_q_lock, flags);
537 iucv_sk(sk)->parent = parent;
538 sk_acceptq_added(parent);
539 }
540
541 void iucv_accept_unlink(struct sock *sk)
542 {
543 unsigned long flags;
544 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
545
546 spin_lock_irqsave(&par->accept_q_lock, flags);
547 list_del_init(&iucv_sk(sk)->accept_q);
548 spin_unlock_irqrestore(&par->accept_q_lock, flags);
549 sk_acceptq_removed(iucv_sk(sk)->parent);
550 iucv_sk(sk)->parent = NULL;
551 sock_put(sk);
552 }
553
554 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
555 {
556 struct iucv_sock *isk, *n;
557 struct sock *sk;
558
559 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
560 sk = (struct sock *) isk;
561 lock_sock(sk);
562
563 if (sk->sk_state == IUCV_CLOSED) {
564 iucv_accept_unlink(sk);
565 release_sock(sk);
566 continue;
567 }
568
569 if (sk->sk_state == IUCV_CONNECTED ||
570 sk->sk_state == IUCV_SEVERED ||
571 sk->sk_state == IUCV_DISCONN || /* due to PM restore */
572 !newsock) {
573 iucv_accept_unlink(sk);
574 if (newsock)
575 sock_graft(sk, newsock);
576
577 if (sk->sk_state == IUCV_SEVERED)
578 sk->sk_state = IUCV_DISCONN;
579
580 release_sock(sk);
581 return sk;
582 }
583
584 release_sock(sk);
585 }
586 return NULL;
587 }
588
589 /* Bind an unbound socket */
590 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
591 int addr_len)
592 {
593 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
594 struct sock *sk = sock->sk;
595 struct iucv_sock *iucv;
596 int err;
597
598 /* Verify the input sockaddr */
599 if (!addr || addr->sa_family != AF_IUCV)
600 return -EINVAL;
601
602 lock_sock(sk);
603 if (sk->sk_state != IUCV_OPEN) {
604 err = -EBADFD;
605 goto done;
606 }
607
608 write_lock_bh(&iucv_sk_list.lock);
609
610 iucv = iucv_sk(sk);
611 if (__iucv_get_sock_by_name(sa->siucv_name)) {
612 err = -EADDRINUSE;
613 goto done_unlock;
614 }
615 if (iucv->path) {
616 err = 0;
617 goto done_unlock;
618 }
619
620 /* Bind the socket */
621 memcpy(iucv->src_name, sa->siucv_name, 8);
622
623 /* Copy the user id */
624 memcpy(iucv->src_user_id, iucv_userid, 8);
625 sk->sk_state = IUCV_BOUND;
626 err = 0;
627
628 done_unlock:
629 /* Release the socket list lock */
630 write_unlock_bh(&iucv_sk_list.lock);
631 done:
632 release_sock(sk);
633 return err;
634 }
635
636 /* Automatically bind an unbound socket */
637 static int iucv_sock_autobind(struct sock *sk)
638 {
639 struct iucv_sock *iucv = iucv_sk(sk);
640 char query_buffer[80];
641 char name[12];
642 int err = 0;
643
644 /* Set the userid and name */
645 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
646 if (unlikely(err))
647 return -EPROTO;
648
649 memcpy(iucv->src_user_id, query_buffer, 8);
650
651 write_lock_bh(&iucv_sk_list.lock);
652
653 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
654 while (__iucv_get_sock_by_name(name)) {
655 sprintf(name, "%08x",
656 atomic_inc_return(&iucv_sk_list.autobind_name));
657 }
658
659 write_unlock_bh(&iucv_sk_list.lock);
660
661 memcpy(&iucv->src_name, name, 8);
662
663 return err;
664 }
665
666 /* Connect an unconnected socket */
667 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
668 int alen, int flags)
669 {
670 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
671 struct sock *sk = sock->sk;
672 struct iucv_sock *iucv;
673 unsigned char user_data[16];
674 int err;
675
676 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
677 return -EINVAL;
678
679 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
680 return -EBADFD;
681
682 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
683 return -EINVAL;
684
685 if (sk->sk_state == IUCV_OPEN) {
686 err = iucv_sock_autobind(sk);
687 if (unlikely(err))
688 return err;
689 }
690
691 lock_sock(sk);
692
693 /* Set the destination information */
694 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
695 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
696
697 high_nmcpy(user_data, sa->siucv_name);
698 low_nmcpy(user_data, iucv_sk(sk)->src_name);
699 ASCEBC(user_data, sizeof(user_data));
700
701 iucv = iucv_sk(sk);
702 /* Create path. */
703 iucv->path = iucv_path_alloc(iucv->msglimit,
704 IUCV_IPRMDATA, GFP_KERNEL);
705 if (!iucv->path) {
706 err = -ENOMEM;
707 goto done;
708 }
709 err = iucv_path_connect(iucv->path, &af_iucv_handler,
710 sa->siucv_user_id, NULL, user_data, sk);
711 if (err) {
712 iucv_path_free(iucv->path);
713 iucv->path = NULL;
714 switch (err) {
715 case 0x0b: /* Target communicator is not logged on */
716 err = -ENETUNREACH;
717 break;
718 case 0x0d: /* Max connections for this guest exceeded */
719 case 0x0e: /* Max connections for target guest exceeded */
720 err = -EAGAIN;
721 break;
722 case 0x0f: /* Missing IUCV authorization */
723 err = -EACCES;
724 break;
725 default:
726 err = -ECONNREFUSED;
727 break;
728 }
729 goto done;
730 }
731
732 if (sk->sk_state != IUCV_CONNECTED) {
733 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
734 IUCV_DISCONN),
735 sock_sndtimeo(sk, flags & O_NONBLOCK));
736 }
737
738 if (sk->sk_state == IUCV_DISCONN) {
739 err = -ECONNREFUSED;
740 }
741
742 if (err) {
743 iucv_path_sever(iucv->path, NULL);
744 iucv_path_free(iucv->path);
745 iucv->path = NULL;
746 }
747
748 done:
749 release_sock(sk);
750 return err;
751 }
752
753 /* Move a socket into listening state. */
754 static int iucv_sock_listen(struct socket *sock, int backlog)
755 {
756 struct sock *sk = sock->sk;
757 int err;
758
759 lock_sock(sk);
760
761 err = -EINVAL;
762 if (sk->sk_state != IUCV_BOUND)
763 goto done;
764
765 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
766 goto done;
767
768 sk->sk_max_ack_backlog = backlog;
769 sk->sk_ack_backlog = 0;
770 sk->sk_state = IUCV_LISTEN;
771 err = 0;
772
773 done:
774 release_sock(sk);
775 return err;
776 }
777
778 /* Accept a pending connection */
779 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
780 int flags)
781 {
782 DECLARE_WAITQUEUE(wait, current);
783 struct sock *sk = sock->sk, *nsk;
784 long timeo;
785 int err = 0;
786
787 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
788
789 if (sk->sk_state != IUCV_LISTEN) {
790 err = -EBADFD;
791 goto done;
792 }
793
794 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
795
796 /* Wait for an incoming connection */
797 add_wait_queue_exclusive(sk->sk_sleep, &wait);
798 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
799 set_current_state(TASK_INTERRUPTIBLE);
800 if (!timeo) {
801 err = -EAGAIN;
802 break;
803 }
804
805 release_sock(sk);
806 timeo = schedule_timeout(timeo);
807 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
808
809 if (sk->sk_state != IUCV_LISTEN) {
810 err = -EBADFD;
811 break;
812 }
813
814 if (signal_pending(current)) {
815 err = sock_intr_errno(timeo);
816 break;
817 }
818 }
819
820 set_current_state(TASK_RUNNING);
821 remove_wait_queue(sk->sk_sleep, &wait);
822
823 if (err)
824 goto done;
825
826 newsock->state = SS_CONNECTED;
827
828 done:
829 release_sock(sk);
830 return err;
831 }
832
833 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
834 int *len, int peer)
835 {
836 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
837 struct sock *sk = sock->sk;
838
839 addr->sa_family = AF_IUCV;
840 *len = sizeof(struct sockaddr_iucv);
841
842 if (peer) {
843 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
844 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
845 } else {
846 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
847 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
848 }
849 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
850 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
851 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
852
853 return 0;
854 }
855
856 /**
857 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
858 * @path: IUCV path
859 * @msg: Pointer to a struct iucv_message
860 * @skb: The socket data to send, skb->len MUST BE <= 7
861 *
862 * Send the socket data in the parameter list in the iucv message
863 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
864 * list and the socket data len at index 7 (last byte).
865 * See also iucv_msg_length().
866 *
867 * Returns the error code from the iucv_message_send() call.
868 */
869 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
870 struct sk_buff *skb)
871 {
872 u8 prmdata[8];
873
874 memcpy(prmdata, (void *) skb->data, skb->len);
875 prmdata[7] = 0xff - (u8) skb->len;
876 return iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
877 (void *) prmdata, 8);
878 }
879
880 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
881 struct msghdr *msg, size_t len)
882 {
883 struct sock *sk = sock->sk;
884 struct iucv_sock *iucv = iucv_sk(sk);
885 struct sk_buff *skb;
886 struct iucv_message txmsg;
887 struct cmsghdr *cmsg;
888 int cmsg_done;
889 long timeo;
890 char user_id[9];
891 char appl_id[9];
892 int err;
893 int noblock = msg->msg_flags & MSG_DONTWAIT;
894
895 err = sock_error(sk);
896 if (err)
897 return err;
898
899 if (msg->msg_flags & MSG_OOB)
900 return -EOPNOTSUPP;
901
902 /* SOCK_SEQPACKET: we do not support segmented records */
903 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
904 return -EOPNOTSUPP;
905
906 lock_sock(sk);
907
908 if (sk->sk_shutdown & SEND_SHUTDOWN) {
909 err = -EPIPE;
910 goto out;
911 }
912
913 /* Return if the socket is not in connected state */
914 if (sk->sk_state != IUCV_CONNECTED) {
915 err = -ENOTCONN;
916 goto out;
917 }
918
919 /* initialize defaults */
920 cmsg_done = 0; /* check for duplicate headers */
921 txmsg.class = 0;
922
923 /* iterate over control messages */
924 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
925 cmsg = CMSG_NXTHDR(msg, cmsg)) {
926
927 if (!CMSG_OK(msg, cmsg)) {
928 err = -EINVAL;
929 goto out;
930 }
931
932 if (cmsg->cmsg_level != SOL_IUCV)
933 continue;
934
935 if (cmsg->cmsg_type & cmsg_done) {
936 err = -EINVAL;
937 goto out;
938 }
939 cmsg_done |= cmsg->cmsg_type;
940
941 switch (cmsg->cmsg_type) {
942 case SCM_IUCV_TRGCLS:
943 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
944 err = -EINVAL;
945 goto out;
946 }
947
948 /* set iucv message target class */
949 memcpy(&txmsg.class,
950 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
951
952 break;
953
954 default:
955 err = -EINVAL;
956 goto out;
957 break;
958 }
959 }
960
961 /* allocate one skb for each iucv message:
962 * this is fine for SOCK_SEQPACKET (unless we want to support
963 * segmented records using the MSG_EOR flag), but
964 * for SOCK_STREAM we might want to improve it in future */
965 skb = sock_alloc_send_skb(sk, len, noblock, &err);
966 if (!skb)
967 goto out;
968 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
969 err = -EFAULT;
970 goto fail;
971 }
972
973 /* wait if outstanding messages for iucv path has reached */
974 timeo = sock_sndtimeo(sk, noblock);
975 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
976 if (err)
977 goto fail;
978
979 /* return -ECONNRESET if the socket is no longer connected */
980 if (sk->sk_state != IUCV_CONNECTED) {
981 err = -ECONNRESET;
982 goto fail;
983 }
984
985 /* increment and save iucv message tag for msg_completion cbk */
986 txmsg.tag = iucv->send_tag++;
987 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
988 skb_queue_tail(&iucv->send_skb_q, skb);
989
990 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
991 && skb->len <= 7) {
992 err = iucv_send_iprm(iucv->path, &txmsg, skb);
993
994 /* on success: there is no message_complete callback
995 * for an IPRMDATA msg; remove skb from send queue */
996 if (err == 0) {
997 skb_unlink(skb, &iucv->send_skb_q);
998 kfree_skb(skb);
999 }
1000
1001 /* this error should never happen since the
1002 * IUCV_IPRMDATA path flag is set... sever path */
1003 if (err == 0x15) {
1004 iucv_path_sever(iucv->path, NULL);
1005 skb_unlink(skb, &iucv->send_skb_q);
1006 err = -EPIPE;
1007 goto fail;
1008 }
1009 } else
1010 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
1011 (void *) skb->data, skb->len);
1012 if (err) {
1013 if (err == 3) {
1014 user_id[8] = 0;
1015 memcpy(user_id, iucv->dst_user_id, 8);
1016 appl_id[8] = 0;
1017 memcpy(appl_id, iucv->dst_name, 8);
1018 pr_err("Application %s on z/VM guest %s"
1019 " exceeds message limit\n",
1020 appl_id, user_id);
1021 err = -EAGAIN;
1022 } else
1023 err = -EPIPE;
1024 skb_unlink(skb, &iucv->send_skb_q);
1025 goto fail;
1026 }
1027
1028 release_sock(sk);
1029 return len;
1030
1031 fail:
1032 kfree_skb(skb);
1033 out:
1034 release_sock(sk);
1035 return err;
1036 }
1037
1038 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1039 *
1040 * Locking: must be called with message_q.lock held
1041 */
1042 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1043 {
1044 int dataleft, size, copied = 0;
1045 struct sk_buff *nskb;
1046
1047 dataleft = len;
1048 while (dataleft) {
1049 if (dataleft >= sk->sk_rcvbuf / 4)
1050 size = sk->sk_rcvbuf / 4;
1051 else
1052 size = dataleft;
1053
1054 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1055 if (!nskb)
1056 return -ENOMEM;
1057
1058 /* copy target class to control buffer of new skb */
1059 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1060
1061 /* copy data fragment */
1062 memcpy(nskb->data, skb->data + copied, size);
1063 copied += size;
1064 dataleft -= size;
1065
1066 skb_reset_transport_header(nskb);
1067 skb_reset_network_header(nskb);
1068 nskb->len = size;
1069
1070 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1071 }
1072
1073 return 0;
1074 }
1075
1076 /* iucv_process_message() - Receive a single outstanding IUCV message
1077 *
1078 * Locking: must be called with message_q.lock held
1079 */
1080 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1081 struct iucv_path *path,
1082 struct iucv_message *msg)
1083 {
1084 int rc;
1085 unsigned int len;
1086
1087 len = iucv_msg_length(msg);
1088
1089 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1090 /* Note: the first 4 bytes are reserved for msg tag */
1091 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1092
1093 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1094 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1095 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1096 skb->data = NULL;
1097 skb->len = 0;
1098 }
1099 } else {
1100 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
1101 skb->data, len, NULL);
1102 if (rc) {
1103 kfree_skb(skb);
1104 return;
1105 }
1106 /* we need to fragment iucv messages for SOCK_STREAM only;
1107 * for SOCK_SEQPACKET, it is only relevant if we support
1108 * record segmentation using MSG_EOR (see also recvmsg()) */
1109 if (sk->sk_type == SOCK_STREAM &&
1110 skb->truesize >= sk->sk_rcvbuf / 4) {
1111 rc = iucv_fragment_skb(sk, skb, len);
1112 kfree_skb(skb);
1113 skb = NULL;
1114 if (rc) {
1115 iucv_path_sever(path, NULL);
1116 return;
1117 }
1118 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1119 } else {
1120 skb_reset_transport_header(skb);
1121 skb_reset_network_header(skb);
1122 skb->len = len;
1123 }
1124 }
1125
1126 if (sock_queue_rcv_skb(sk, skb))
1127 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1128 }
1129
1130 /* iucv_process_message_q() - Process outstanding IUCV messages
1131 *
1132 * Locking: must be called with message_q.lock held
1133 */
1134 static void iucv_process_message_q(struct sock *sk)
1135 {
1136 struct iucv_sock *iucv = iucv_sk(sk);
1137 struct sk_buff *skb;
1138 struct sock_msg_q *p, *n;
1139
1140 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1141 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1142 if (!skb)
1143 break;
1144 iucv_process_message(sk, skb, p->path, &p->msg);
1145 list_del(&p->list);
1146 kfree(p);
1147 if (!skb_queue_empty(&iucv->backlog_skb_q))
1148 break;
1149 }
1150 }
1151
1152 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1153 struct msghdr *msg, size_t len, int flags)
1154 {
1155 int noblock = flags & MSG_DONTWAIT;
1156 struct sock *sk = sock->sk;
1157 struct iucv_sock *iucv = iucv_sk(sk);
1158 unsigned int copied, rlen;
1159 struct sk_buff *skb, *rskb, *cskb;
1160 int err = 0;
1161
1162 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
1163 skb_queue_empty(&iucv->backlog_skb_q) &&
1164 skb_queue_empty(&sk->sk_receive_queue) &&
1165 list_empty(&iucv->message_q.list))
1166 return 0;
1167
1168 if (flags & (MSG_OOB))
1169 return -EOPNOTSUPP;
1170
1171 /* receive/dequeue next skb:
1172 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1173 skb = skb_recv_datagram(sk, flags, noblock, &err);
1174 if (!skb) {
1175 if (sk->sk_shutdown & RCV_SHUTDOWN)
1176 return 0;
1177 return err;
1178 }
1179
1180 rlen = skb->len; /* real length of skb */
1181 copied = min_t(unsigned int, rlen, len);
1182
1183 cskb = skb;
1184 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
1185 if (!(flags & MSG_PEEK))
1186 skb_queue_head(&sk->sk_receive_queue, skb);
1187 return -EFAULT;
1188 }
1189
1190 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1191 if (sk->sk_type == SOCK_SEQPACKET) {
1192 if (copied < rlen)
1193 msg->msg_flags |= MSG_TRUNC;
1194 /* each iucv message contains a complete record */
1195 msg->msg_flags |= MSG_EOR;
1196 }
1197
1198 /* create control message to store iucv msg target class:
1199 * get the trgcls from the control buffer of the skb due to
1200 * fragmentation of original iucv message. */
1201 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1202 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1203 if (err) {
1204 if (!(flags & MSG_PEEK))
1205 skb_queue_head(&sk->sk_receive_queue, skb);
1206 return err;
1207 }
1208
1209 /* Mark read part of skb as used */
1210 if (!(flags & MSG_PEEK)) {
1211
1212 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1213 if (sk->sk_type == SOCK_STREAM) {
1214 skb_pull(skb, copied);
1215 if (skb->len) {
1216 skb_queue_head(&sk->sk_receive_queue, skb);
1217 goto done;
1218 }
1219 }
1220
1221 kfree_skb(skb);
1222
1223 /* Queue backlog skbs */
1224 spin_lock_bh(&iucv->message_q.lock);
1225 rskb = skb_dequeue(&iucv->backlog_skb_q);
1226 while (rskb) {
1227 if (sock_queue_rcv_skb(sk, rskb)) {
1228 skb_queue_head(&iucv->backlog_skb_q,
1229 rskb);
1230 break;
1231 } else {
1232 rskb = skb_dequeue(&iucv->backlog_skb_q);
1233 }
1234 }
1235 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1236 if (!list_empty(&iucv->message_q.list))
1237 iucv_process_message_q(sk);
1238 }
1239 spin_unlock_bh(&iucv->message_q.lock);
1240 }
1241
1242 done:
1243 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1244 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1245 copied = rlen;
1246
1247 return copied;
1248 }
1249
1250 static inline unsigned int iucv_accept_poll(struct sock *parent)
1251 {
1252 struct iucv_sock *isk, *n;
1253 struct sock *sk;
1254
1255 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1256 sk = (struct sock *) isk;
1257
1258 if (sk->sk_state == IUCV_CONNECTED)
1259 return POLLIN | POLLRDNORM;
1260 }
1261
1262 return 0;
1263 }
1264
1265 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1266 poll_table *wait)
1267 {
1268 struct sock *sk = sock->sk;
1269 unsigned int mask = 0;
1270
1271 sock_poll_wait(file, sk->sk_sleep, wait);
1272
1273 if (sk->sk_state == IUCV_LISTEN)
1274 return iucv_accept_poll(sk);
1275
1276 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1277 mask |= POLLERR;
1278
1279 if (sk->sk_shutdown & RCV_SHUTDOWN)
1280 mask |= POLLRDHUP;
1281
1282 if (sk->sk_shutdown == SHUTDOWN_MASK)
1283 mask |= POLLHUP;
1284
1285 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1286 (sk->sk_shutdown & RCV_SHUTDOWN))
1287 mask |= POLLIN | POLLRDNORM;
1288
1289 if (sk->sk_state == IUCV_CLOSED)
1290 mask |= POLLHUP;
1291
1292 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
1293 mask |= POLLIN;
1294
1295 if (sock_writeable(sk))
1296 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1297 else
1298 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1299
1300 return mask;
1301 }
1302
1303 static int iucv_sock_shutdown(struct socket *sock, int how)
1304 {
1305 struct sock *sk = sock->sk;
1306 struct iucv_sock *iucv = iucv_sk(sk);
1307 struct iucv_message txmsg;
1308 int err = 0;
1309
1310 how++;
1311
1312 if ((how & ~SHUTDOWN_MASK) || !how)
1313 return -EINVAL;
1314
1315 lock_sock(sk);
1316 switch (sk->sk_state) {
1317 case IUCV_DISCONN:
1318 case IUCV_CLOSING:
1319 case IUCV_SEVERED:
1320 case IUCV_CLOSED:
1321 err = -ENOTCONN;
1322 goto fail;
1323
1324 default:
1325 sk->sk_shutdown |= how;
1326 break;
1327 }
1328
1329 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1330 txmsg.class = 0;
1331 txmsg.tag = 0;
1332 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
1333 (void *) iprm_shutdown, 8);
1334 if (err) {
1335 switch (err) {
1336 case 1:
1337 err = -ENOTCONN;
1338 break;
1339 case 2:
1340 err = -ECONNRESET;
1341 break;
1342 default:
1343 err = -ENOTCONN;
1344 break;
1345 }
1346 }
1347 }
1348
1349 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1350 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
1351 if (err)
1352 err = -ENOTCONN;
1353
1354 skb_queue_purge(&sk->sk_receive_queue);
1355 }
1356
1357 /* Wake up anyone sleeping in poll */
1358 sk->sk_state_change(sk);
1359
1360 fail:
1361 release_sock(sk);
1362 return err;
1363 }
1364
1365 static int iucv_sock_release(struct socket *sock)
1366 {
1367 struct sock *sk = sock->sk;
1368 int err = 0;
1369
1370 if (!sk)
1371 return 0;
1372
1373 iucv_sock_close(sk);
1374
1375 /* Unregister with IUCV base support */
1376 if (iucv_sk(sk)->path) {
1377 iucv_path_sever(iucv_sk(sk)->path, NULL);
1378 iucv_path_free(iucv_sk(sk)->path);
1379 iucv_sk(sk)->path = NULL;
1380 }
1381
1382 sock_orphan(sk);
1383 iucv_sock_kill(sk);
1384 return err;
1385 }
1386
1387 /* getsockopt and setsockopt */
1388 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1389 char __user *optval, unsigned int optlen)
1390 {
1391 struct sock *sk = sock->sk;
1392 struct iucv_sock *iucv = iucv_sk(sk);
1393 int val;
1394 int rc;
1395
1396 if (level != SOL_IUCV)
1397 return -ENOPROTOOPT;
1398
1399 if (optlen < sizeof(int))
1400 return -EINVAL;
1401
1402 if (get_user(val, (int __user *) optval))
1403 return -EFAULT;
1404
1405 rc = 0;
1406
1407 lock_sock(sk);
1408 switch (optname) {
1409 case SO_IPRMDATA_MSG:
1410 if (val)
1411 iucv->flags |= IUCV_IPRMDATA;
1412 else
1413 iucv->flags &= ~IUCV_IPRMDATA;
1414 break;
1415 case SO_MSGLIMIT:
1416 switch (sk->sk_state) {
1417 case IUCV_OPEN:
1418 case IUCV_BOUND:
1419 if (val < 1 || val > (u16)(~0))
1420 rc = -EINVAL;
1421 else
1422 iucv->msglimit = val;
1423 break;
1424 default:
1425 rc = -EINVAL;
1426 break;
1427 }
1428 break;
1429 default:
1430 rc = -ENOPROTOOPT;
1431 break;
1432 }
1433 release_sock(sk);
1434
1435 return rc;
1436 }
1437
1438 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1439 char __user *optval, int __user *optlen)
1440 {
1441 struct sock *sk = sock->sk;
1442 struct iucv_sock *iucv = iucv_sk(sk);
1443 int val, len;
1444
1445 if (level != SOL_IUCV)
1446 return -ENOPROTOOPT;
1447
1448 if (get_user(len, optlen))
1449 return -EFAULT;
1450
1451 if (len < 0)
1452 return -EINVAL;
1453
1454 len = min_t(unsigned int, len, sizeof(int));
1455
1456 switch (optname) {
1457 case SO_IPRMDATA_MSG:
1458 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1459 break;
1460 case SO_MSGLIMIT:
1461 lock_sock(sk);
1462 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1463 : iucv->msglimit; /* default */
1464 release_sock(sk);
1465 break;
1466 default:
1467 return -ENOPROTOOPT;
1468 }
1469
1470 if (put_user(len, optlen))
1471 return -EFAULT;
1472 if (copy_to_user(optval, &val, len))
1473 return -EFAULT;
1474
1475 return 0;
1476 }
1477
1478
1479 /* Callback wrappers - called from iucv base support */
1480 static int iucv_callback_connreq(struct iucv_path *path,
1481 u8 ipvmid[8], u8 ipuser[16])
1482 {
1483 unsigned char user_data[16];
1484 unsigned char nuser_data[16];
1485 unsigned char src_name[8];
1486 struct hlist_node *node;
1487 struct sock *sk, *nsk;
1488 struct iucv_sock *iucv, *niucv;
1489 int err;
1490
1491 memcpy(src_name, ipuser, 8);
1492 EBCASC(src_name, 8);
1493 /* Find out if this path belongs to af_iucv. */
1494 read_lock(&iucv_sk_list.lock);
1495 iucv = NULL;
1496 sk = NULL;
1497 sk_for_each(sk, node, &iucv_sk_list.head)
1498 if (sk->sk_state == IUCV_LISTEN &&
1499 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1500 /*
1501 * Found a listening socket with
1502 * src_name == ipuser[0-7].
1503 */
1504 iucv = iucv_sk(sk);
1505 break;
1506 }
1507 read_unlock(&iucv_sk_list.lock);
1508 if (!iucv)
1509 /* No socket found, not one of our paths. */
1510 return -EINVAL;
1511
1512 bh_lock_sock(sk);
1513
1514 /* Check if parent socket is listening */
1515 low_nmcpy(user_data, iucv->src_name);
1516 high_nmcpy(user_data, iucv->dst_name);
1517 ASCEBC(user_data, sizeof(user_data));
1518 if (sk->sk_state != IUCV_LISTEN) {
1519 err = iucv_path_sever(path, user_data);
1520 iucv_path_free(path);
1521 goto fail;
1522 }
1523
1524 /* Check for backlog size */
1525 if (sk_acceptq_is_full(sk)) {
1526 err = iucv_path_sever(path, user_data);
1527 iucv_path_free(path);
1528 goto fail;
1529 }
1530
1531 /* Create the new socket */
1532 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1533 if (!nsk) {
1534 err = iucv_path_sever(path, user_data);
1535 iucv_path_free(path);
1536 goto fail;
1537 }
1538
1539 niucv = iucv_sk(nsk);
1540 iucv_sock_init(nsk, sk);
1541
1542 /* Set the new iucv_sock */
1543 memcpy(niucv->dst_name, ipuser + 8, 8);
1544 EBCASC(niucv->dst_name, 8);
1545 memcpy(niucv->dst_user_id, ipvmid, 8);
1546 memcpy(niucv->src_name, iucv->src_name, 8);
1547 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1548 niucv->path = path;
1549
1550 /* Call iucv_accept */
1551 high_nmcpy(nuser_data, ipuser + 8);
1552 memcpy(nuser_data + 8, niucv->src_name, 8);
1553 ASCEBC(nuser_data + 8, 8);
1554
1555 /* set message limit for path based on msglimit of accepting socket */
1556 niucv->msglimit = iucv->msglimit;
1557 path->msglim = iucv->msglimit;
1558 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1559 if (err) {
1560 err = iucv_path_sever(path, user_data);
1561 iucv_path_free(path);
1562 iucv_sock_kill(nsk);
1563 goto fail;
1564 }
1565
1566 iucv_accept_enqueue(sk, nsk);
1567
1568 /* Wake up accept */
1569 nsk->sk_state = IUCV_CONNECTED;
1570 sk->sk_data_ready(sk, 1);
1571 err = 0;
1572 fail:
1573 bh_unlock_sock(sk);
1574 return 0;
1575 }
1576
1577 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1578 {
1579 struct sock *sk = path->private;
1580
1581 sk->sk_state = IUCV_CONNECTED;
1582 sk->sk_state_change(sk);
1583 }
1584
1585 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1586 {
1587 struct sock *sk = path->private;
1588 struct iucv_sock *iucv = iucv_sk(sk);
1589 struct sk_buff *skb;
1590 struct sock_msg_q *save_msg;
1591 int len;
1592
1593 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1594 iucv_message_reject(path, msg);
1595 return;
1596 }
1597
1598 spin_lock(&iucv->message_q.lock);
1599
1600 if (!list_empty(&iucv->message_q.list) ||
1601 !skb_queue_empty(&iucv->backlog_skb_q))
1602 goto save_message;
1603
1604 len = atomic_read(&sk->sk_rmem_alloc);
1605 len += iucv_msg_length(msg) + sizeof(struct sk_buff);
1606 if (len > sk->sk_rcvbuf)
1607 goto save_message;
1608
1609 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1610 if (!skb)
1611 goto save_message;
1612
1613 iucv_process_message(sk, skb, path, msg);
1614 goto out_unlock;
1615
1616 save_message:
1617 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1618 if (!save_msg)
1619 return;
1620 save_msg->path = path;
1621 save_msg->msg = *msg;
1622
1623 list_add_tail(&save_msg->list, &iucv->message_q.list);
1624
1625 out_unlock:
1626 spin_unlock(&iucv->message_q.lock);
1627 }
1628
1629 static void iucv_callback_txdone(struct iucv_path *path,
1630 struct iucv_message *msg)
1631 {
1632 struct sock *sk = path->private;
1633 struct sk_buff *this = NULL;
1634 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1635 struct sk_buff *list_skb = list->next;
1636 unsigned long flags;
1637
1638 if (!skb_queue_empty(list)) {
1639 spin_lock_irqsave(&list->lock, flags);
1640
1641 while (list_skb != (struct sk_buff *)list) {
1642 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1643 this = list_skb;
1644 break;
1645 }
1646 list_skb = list_skb->next;
1647 }
1648 if (this)
1649 __skb_unlink(this, list);
1650
1651 spin_unlock_irqrestore(&list->lock, flags);
1652
1653 if (this) {
1654 kfree_skb(this);
1655 /* wake up any process waiting for sending */
1656 iucv_sock_wake_msglim(sk);
1657 }
1658 }
1659 BUG_ON(!this);
1660
1661 if (sk->sk_state == IUCV_CLOSING) {
1662 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1663 sk->sk_state = IUCV_CLOSED;
1664 sk->sk_state_change(sk);
1665 }
1666 }
1667
1668 }
1669
1670 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1671 {
1672 struct sock *sk = path->private;
1673
1674 if (!list_empty(&iucv_sk(sk)->accept_q))
1675 sk->sk_state = IUCV_SEVERED;
1676 else
1677 sk->sk_state = IUCV_DISCONN;
1678
1679 sk->sk_state_change(sk);
1680 }
1681
1682 /* called if the other communication side shuts down its RECV direction;
1683 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1684 */
1685 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1686 {
1687 struct sock *sk = path->private;
1688
1689 bh_lock_sock(sk);
1690 if (sk->sk_state != IUCV_CLOSED) {
1691 sk->sk_shutdown |= SEND_SHUTDOWN;
1692 sk->sk_state_change(sk);
1693 }
1694 bh_unlock_sock(sk);
1695 }
1696
1697 static const struct proto_ops iucv_sock_ops = {
1698 .family = PF_IUCV,
1699 .owner = THIS_MODULE,
1700 .release = iucv_sock_release,
1701 .bind = iucv_sock_bind,
1702 .connect = iucv_sock_connect,
1703 .listen = iucv_sock_listen,
1704 .accept = iucv_sock_accept,
1705 .getname = iucv_sock_getname,
1706 .sendmsg = iucv_sock_sendmsg,
1707 .recvmsg = iucv_sock_recvmsg,
1708 .poll = iucv_sock_poll,
1709 .ioctl = sock_no_ioctl,
1710 .mmap = sock_no_mmap,
1711 .socketpair = sock_no_socketpair,
1712 .shutdown = iucv_sock_shutdown,
1713 .setsockopt = iucv_sock_setsockopt,
1714 .getsockopt = iucv_sock_getsockopt,
1715 };
1716
1717 static const struct net_proto_family iucv_sock_family_ops = {
1718 .family = AF_IUCV,
1719 .owner = THIS_MODULE,
1720 .create = iucv_sock_create,
1721 };
1722
1723 static int __init afiucv_init(void)
1724 {
1725 int err;
1726
1727 if (!MACHINE_IS_VM) {
1728 pr_err("The af_iucv module cannot be loaded"
1729 " without z/VM\n");
1730 err = -EPROTONOSUPPORT;
1731 goto out;
1732 }
1733 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1734 if (unlikely(err)) {
1735 WARN_ON(err);
1736 err = -EPROTONOSUPPORT;
1737 goto out;
1738 }
1739
1740 err = iucv_register(&af_iucv_handler, 0);
1741 if (err)
1742 goto out;
1743 err = proto_register(&iucv_proto, 0);
1744 if (err)
1745 goto out_iucv;
1746 err = sock_register(&iucv_sock_family_ops);
1747 if (err)
1748 goto out_proto;
1749 /* establish dummy device */
1750 err = driver_register(&af_iucv_driver);
1751 if (err)
1752 goto out_sock;
1753 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
1754 if (!af_iucv_dev) {
1755 err = -ENOMEM;
1756 goto out_driver;
1757 }
1758 dev_set_name(af_iucv_dev, "af_iucv");
1759 af_iucv_dev->bus = &iucv_bus;
1760 af_iucv_dev->parent = iucv_root;
1761 af_iucv_dev->release = (void (*)(struct device *))kfree;
1762 af_iucv_dev->driver = &af_iucv_driver;
1763 err = device_register(af_iucv_dev);
1764 if (err)
1765 goto out_driver;
1766
1767 return 0;
1768
1769 out_driver:
1770 driver_unregister(&af_iucv_driver);
1771 out_sock:
1772 sock_unregister(PF_IUCV);
1773 out_proto:
1774 proto_unregister(&iucv_proto);
1775 out_iucv:
1776 iucv_unregister(&af_iucv_handler, 0);
1777 out:
1778 return err;
1779 }
1780
1781 static void __exit afiucv_exit(void)
1782 {
1783 device_unregister(af_iucv_dev);
1784 driver_unregister(&af_iucv_driver);
1785 sock_unregister(PF_IUCV);
1786 proto_unregister(&iucv_proto);
1787 iucv_unregister(&af_iucv_handler, 0);
1788 }
1789
1790 module_init(afiucv_init);
1791 module_exit(afiucv_exit);
1792
1793 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1794 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1795 MODULE_VERSION(VERSION);
1796 MODULE_LICENSE("GPL");
1797 MODULE_ALIAS_NETPROTO(PF_IUCV);
Linux kernel - Deliverables
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