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selinux: adjust rules for ATTR_FORCE
[linux-2.6.git] / net / iucv / af_iucv.c
blob49c15b48408e5617a5405ba396f1f9b9e427dd5d
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 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 while (!(condition)) { \
63 prepare_to_wait(sk->sk_sleep, &__wait, TASK_INTERRUPTIBLE); \
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 sock_set_flag(parent, SOCK_ZAPPED);
365 }
366
367 /* Kill socket */
368 static void iucv_sock_kill(struct sock *sk)
369 {
370 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
371 return;
372
373 iucv_sock_unlink(&iucv_sk_list, sk);
374 sock_set_flag(sk, SOCK_DEAD);
375 sock_put(sk);
376 }
377
378 /* Close an IUCV socket */
379 static void iucv_sock_close(struct sock *sk)
380 {
381 unsigned char user_data[16];
382 struct iucv_sock *iucv = iucv_sk(sk);
383 int err;
384 unsigned long timeo;
385
386 iucv_sock_clear_timer(sk);
387 lock_sock(sk);
388
389 switch (sk->sk_state) {
390 case IUCV_LISTEN:
391 iucv_sock_cleanup_listen(sk);
392 break;
393
394 case IUCV_CONNECTED:
395 case IUCV_DISCONN:
396 err = 0;
397
398 sk->sk_state = IUCV_CLOSING;
399 sk->sk_state_change(sk);
400
401 if (!skb_queue_empty(&iucv->send_skb_q)) {
402 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
403 timeo = sk->sk_lingertime;
404 else
405 timeo = IUCV_DISCONN_TIMEOUT;
406 err = iucv_sock_wait(sk,
407 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
408 timeo);
409 }
410
411 case IUCV_CLOSING: /* fall through */
412 sk->sk_state = IUCV_CLOSED;
413 sk->sk_state_change(sk);
414
415 if (iucv->path) {
416 low_nmcpy(user_data, iucv->src_name);
417 high_nmcpy(user_data, iucv->dst_name);
418 ASCEBC(user_data, sizeof(user_data));
419 err = iucv_path_sever(iucv->path, user_data);
420 iucv_path_free(iucv->path);
421 iucv->path = NULL;
422 }
423
424 sk->sk_err = ECONNRESET;
425 sk->sk_state_change(sk);
426
427 skb_queue_purge(&iucv->send_skb_q);
428 skb_queue_purge(&iucv->backlog_skb_q);
429
430 sock_set_flag(sk, SOCK_ZAPPED);
431 break;
432
433 default:
434 sock_set_flag(sk, SOCK_ZAPPED);
435 break;
436 }
437
438 release_sock(sk);
439 iucv_sock_kill(sk);
440 }
441
442 static void iucv_sock_init(struct sock *sk, struct sock *parent)
443 {
444 if (parent)
445 sk->sk_type = parent->sk_type;
446 }
447
448 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
449 {
450 struct sock *sk;
451
452 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
453 if (!sk)
454 return NULL;
455
456 sock_init_data(sock, sk);
457 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
458 spin_lock_init(&iucv_sk(sk)->accept_q_lock);
459 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
460 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
461 spin_lock_init(&iucv_sk(sk)->message_q.lock);
462 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
463 iucv_sk(sk)->send_tag = 0;
464 iucv_sk(sk)->flags = 0;
465 iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT;
466 iucv_sk(sk)->path = NULL;
467 memset(&iucv_sk(sk)->src_user_id , 0, 32);
468
469 sk->sk_destruct = iucv_sock_destruct;
470 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
471 sk->sk_allocation = GFP_DMA;
472
473 sock_reset_flag(sk, SOCK_ZAPPED);
474
475 sk->sk_protocol = proto;
476 sk->sk_state = IUCV_OPEN;
477
478 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
479
480 iucv_sock_link(&iucv_sk_list, sk);
481 return sk;
482 }
483
484 /* Create an IUCV socket */
485 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
486 {
487 struct sock *sk;
488
489 if (protocol && protocol != PF_IUCV)
490 return -EPROTONOSUPPORT;
491
492 sock->state = SS_UNCONNECTED;
493
494 switch (sock->type) {
495 case SOCK_STREAM:
496 sock->ops = &iucv_sock_ops;
497 break;
498 case SOCK_SEQPACKET:
499 /* currently, proto ops can handle both sk types */
500 sock->ops = &iucv_sock_ops;
501 break;
502 default:
503 return -ESOCKTNOSUPPORT;
504 }
505
506 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
507 if (!sk)
508 return -ENOMEM;
509
510 iucv_sock_init(sk, NULL);
511
512 return 0;
513 }
514
515 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
516 {
517 write_lock_bh(&l->lock);
518 sk_add_node(sk, &l->head);
519 write_unlock_bh(&l->lock);
520 }
521
522 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
523 {
524 write_lock_bh(&l->lock);
525 sk_del_node_init(sk);
526 write_unlock_bh(&l->lock);
527 }
528
529 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
530 {
531 unsigned long flags;
532 struct iucv_sock *par = iucv_sk(parent);
533
534 sock_hold(sk);
535 spin_lock_irqsave(&par->accept_q_lock, flags);
536 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
537 spin_unlock_irqrestore(&par->accept_q_lock, flags);
538 iucv_sk(sk)->parent = parent;
539 parent->sk_ack_backlog++;
540 }
541
542 void iucv_accept_unlink(struct sock *sk)
543 {
544 unsigned long flags;
545 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
546
547 spin_lock_irqsave(&par->accept_q_lock, flags);
548 list_del_init(&iucv_sk(sk)->accept_q);
549 spin_unlock_irqrestore(&par->accept_q_lock, flags);
550 iucv_sk(sk)->parent->sk_ack_backlog--;
551 iucv_sk(sk)->parent = NULL;
552 sock_put(sk);
553 }
554
555 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
556 {
557 struct iucv_sock *isk, *n;
558 struct sock *sk;
559
560 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
561 sk = (struct sock *) isk;
562 lock_sock(sk);
563
564 if (sk->sk_state == IUCV_CLOSED) {
565 iucv_accept_unlink(sk);
566 release_sock(sk);
567 continue;
568 }
569
570 if (sk->sk_state == IUCV_CONNECTED ||
571 sk->sk_state == IUCV_SEVERED ||
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 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1039 {
1040 int dataleft, size, copied = 0;
1041 struct sk_buff *nskb;
1042
1043 dataleft = len;
1044 while (dataleft) {
1045 if (dataleft >= sk->sk_rcvbuf / 4)
1046 size = sk->sk_rcvbuf / 4;
1047 else
1048 size = dataleft;
1049
1050 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1051 if (!nskb)
1052 return -ENOMEM;
1053
1054 /* copy target class to control buffer of new skb */
1055 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1056
1057 /* copy data fragment */
1058 memcpy(nskb->data, skb->data + copied, size);
1059 copied += size;
1060 dataleft -= size;
1061
1062 skb_reset_transport_header(nskb);
1063 skb_reset_network_header(nskb);
1064 nskb->len = size;
1065
1066 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1067 }
1068
1069 return 0;
1070 }
1071
1072 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1073 struct iucv_path *path,
1074 struct iucv_message *msg)
1075 {
1076 int rc;
1077 unsigned int len;
1078
1079 len = iucv_msg_length(msg);
1080
1081 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1082 /* Note: the first 4 bytes are reserved for msg tag */
1083 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1084
1085 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1086 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1087 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1088 skb->data = NULL;
1089 skb->len = 0;
1090 }
1091 } else {
1092 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
1093 skb->data, len, NULL);
1094 if (rc) {
1095 kfree_skb(skb);
1096 return;
1097 }
1098 /* we need to fragment iucv messages for SOCK_STREAM only;
1099 * for SOCK_SEQPACKET, it is only relevant if we support
1100 * record segmentation using MSG_EOR (see also recvmsg()) */
1101 if (sk->sk_type == SOCK_STREAM &&
1102 skb->truesize >= sk->sk_rcvbuf / 4) {
1103 rc = iucv_fragment_skb(sk, skb, len);
1104 kfree_skb(skb);
1105 skb = NULL;
1106 if (rc) {
1107 iucv_path_sever(path, NULL);
1108 return;
1109 }
1110 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1111 } else {
1112 skb_reset_transport_header(skb);
1113 skb_reset_network_header(skb);
1114 skb->len = len;
1115 }
1116 }
1117
1118 if (sock_queue_rcv_skb(sk, skb))
1119 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1120 }
1121
1122 static void iucv_process_message_q(struct sock *sk)
1123 {
1124 struct iucv_sock *iucv = iucv_sk(sk);
1125 struct sk_buff *skb;
1126 struct sock_msg_q *p, *n;
1127
1128 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1129 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1130 if (!skb)
1131 break;
1132 iucv_process_message(sk, skb, p->path, &p->msg);
1133 list_del(&p->list);
1134 kfree(p);
1135 if (!skb_queue_empty(&iucv->backlog_skb_q))
1136 break;
1137 }
1138 }
1139
1140 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1141 struct msghdr *msg, size_t len, int flags)
1142 {
1143 int noblock = flags & MSG_DONTWAIT;
1144 struct sock *sk = sock->sk;
1145 struct iucv_sock *iucv = iucv_sk(sk);
1146 unsigned int copied, rlen;
1147 struct sk_buff *skb, *rskb, *cskb;
1148 int err = 0;
1149
1150 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
1151 skb_queue_empty(&iucv->backlog_skb_q) &&
1152 skb_queue_empty(&sk->sk_receive_queue) &&
1153 list_empty(&iucv->message_q.list))
1154 return 0;
1155
1156 if (flags & (MSG_OOB))
1157 return -EOPNOTSUPP;
1158
1159 /* receive/dequeue next skb:
1160 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1161 skb = skb_recv_datagram(sk, flags, noblock, &err);
1162 if (!skb) {
1163 if (sk->sk_shutdown & RCV_SHUTDOWN)
1164 return 0;
1165 return err;
1166 }
1167
1168 rlen = skb->len; /* real length of skb */
1169 copied = min_t(unsigned int, rlen, len);
1170
1171 cskb = skb;
1172 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
1173 if (!(flags & MSG_PEEK))
1174 skb_queue_head(&sk->sk_receive_queue, skb);
1175 return -EFAULT;
1176 }
1177
1178 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1179 if (sk->sk_type == SOCK_SEQPACKET) {
1180 if (copied < rlen)
1181 msg->msg_flags |= MSG_TRUNC;
1182 /* each iucv message contains a complete record */
1183 msg->msg_flags |= MSG_EOR;
1184 }
1185
1186 /* create control message to store iucv msg target class:
1187 * get the trgcls from the control buffer of the skb due to
1188 * fragmentation of original iucv message. */
1189 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1190 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1191 if (err) {
1192 if (!(flags & MSG_PEEK))
1193 skb_queue_head(&sk->sk_receive_queue, skb);
1194 return err;
1195 }
1196
1197 /* Mark read part of skb as used */
1198 if (!(flags & MSG_PEEK)) {
1199
1200 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1201 if (sk->sk_type == SOCK_STREAM) {
1202 skb_pull(skb, copied);
1203 if (skb->len) {
1204 skb_queue_head(&sk->sk_receive_queue, skb);
1205 goto done;
1206 }
1207 }
1208
1209 kfree_skb(skb);
1210
1211 /* Queue backlog skbs */
1212 rskb = skb_dequeue(&iucv->backlog_skb_q);
1213 while (rskb) {
1214 if (sock_queue_rcv_skb(sk, rskb)) {
1215 skb_queue_head(&iucv->backlog_skb_q,
1216 rskb);
1217 break;
1218 } else {
1219 rskb = skb_dequeue(&iucv->backlog_skb_q);
1220 }
1221 }
1222 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1223 spin_lock_bh(&iucv->message_q.lock);
1224 if (!list_empty(&iucv->message_q.list))
1225 iucv_process_message_q(sk);
1226 spin_unlock_bh(&iucv->message_q.lock);
1227 }
1228 }
1229
1230 done:
1231 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1232 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1233 copied = rlen;
1234
1235 return copied;
1236 }
1237
1238 static inline unsigned int iucv_accept_poll(struct sock *parent)
1239 {
1240 struct iucv_sock *isk, *n;
1241 struct sock *sk;
1242
1243 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1244 sk = (struct sock *) isk;
1245
1246 if (sk->sk_state == IUCV_CONNECTED)
1247 return POLLIN | POLLRDNORM;
1248 }
1249
1250 return 0;
1251 }
1252
1253 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1254 poll_table *wait)
1255 {
1256 struct sock *sk = sock->sk;
1257 unsigned int mask = 0;
1258
1259 sock_poll_wait(file, sk->sk_sleep, wait);
1260
1261 if (sk->sk_state == IUCV_LISTEN)
1262 return iucv_accept_poll(sk);
1263
1264 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1265 mask |= POLLERR;
1266
1267 if (sk->sk_shutdown & RCV_SHUTDOWN)
1268 mask |= POLLRDHUP;
1269
1270 if (sk->sk_shutdown == SHUTDOWN_MASK)
1271 mask |= POLLHUP;
1272
1273 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1274 (sk->sk_shutdown & RCV_SHUTDOWN))
1275 mask |= POLLIN | POLLRDNORM;
1276
1277 if (sk->sk_state == IUCV_CLOSED)
1278 mask |= POLLHUP;
1279
1280 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
1281 mask |= POLLIN;
1282
1283 if (sock_writeable(sk))
1284 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1285 else
1286 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1287
1288 return mask;
1289 }
1290
1291 static int iucv_sock_shutdown(struct socket *sock, int how)
1292 {
1293 struct sock *sk = sock->sk;
1294 struct iucv_sock *iucv = iucv_sk(sk);
1295 struct iucv_message txmsg;
1296 int err = 0;
1297
1298 how++;
1299
1300 if ((how & ~SHUTDOWN_MASK) || !how)
1301 return -EINVAL;
1302
1303 lock_sock(sk);
1304 switch (sk->sk_state) {
1305 case IUCV_DISCONN:
1306 case IUCV_CLOSING:
1307 case IUCV_SEVERED:
1308 case IUCV_CLOSED:
1309 err = -ENOTCONN;
1310 goto fail;
1311
1312 default:
1313 sk->sk_shutdown |= how;
1314 break;
1315 }
1316
1317 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1318 txmsg.class = 0;
1319 txmsg.tag = 0;
1320 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
1321 (void *) iprm_shutdown, 8);
1322 if (err) {
1323 switch (err) {
1324 case 1:
1325 err = -ENOTCONN;
1326 break;
1327 case 2:
1328 err = -ECONNRESET;
1329 break;
1330 default:
1331 err = -ENOTCONN;
1332 break;
1333 }
1334 }
1335 }
1336
1337 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1338 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
1339 if (err)
1340 err = -ENOTCONN;
1341
1342 skb_queue_purge(&sk->sk_receive_queue);
1343 }
1344
1345 /* Wake up anyone sleeping in poll */
1346 sk->sk_state_change(sk);
1347
1348 fail:
1349 release_sock(sk);
1350 return err;
1351 }
1352
1353 static int iucv_sock_release(struct socket *sock)
1354 {
1355 struct sock *sk = sock->sk;
1356 int err = 0;
1357
1358 if (!sk)
1359 return 0;
1360
1361 iucv_sock_close(sk);
1362
1363 /* Unregister with IUCV base support */
1364 if (iucv_sk(sk)->path) {
1365 iucv_path_sever(iucv_sk(sk)->path, NULL);
1366 iucv_path_free(iucv_sk(sk)->path);
1367 iucv_sk(sk)->path = NULL;
1368 }
1369
1370 sock_orphan(sk);
1371 iucv_sock_kill(sk);
1372 return err;
1373 }
1374
1375 /* getsockopt and setsockopt */
1376 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1377 char __user *optval, int optlen)
1378 {
1379 struct sock *sk = sock->sk;
1380 struct iucv_sock *iucv = iucv_sk(sk);
1381 int val;
1382 int rc;
1383
1384 if (level != SOL_IUCV)
1385 return -ENOPROTOOPT;
1386
1387 if (optlen < sizeof(int))
1388 return -EINVAL;
1389
1390 if (get_user(val, (int __user *) optval))
1391 return -EFAULT;
1392
1393 rc = 0;
1394
1395 lock_sock(sk);
1396 switch (optname) {
1397 case SO_IPRMDATA_MSG:
1398 if (val)
1399 iucv->flags |= IUCV_IPRMDATA;
1400 else
1401 iucv->flags &= ~IUCV_IPRMDATA;
1402 break;
1403 case SO_MSGLIMIT:
1404 switch (sk->sk_state) {
1405 case IUCV_OPEN:
1406 case IUCV_BOUND:
1407 if (val < 1 || val > (u16)(~0))
1408 rc = -EINVAL;
1409 else
1410 iucv->msglimit = val;
1411 break;
1412 default:
1413 rc = -EINVAL;
1414 break;
1415 }
1416 break;
1417 default:
1418 rc = -ENOPROTOOPT;
1419 break;
1420 }
1421 release_sock(sk);
1422
1423 return rc;
1424 }
1425
1426 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1427 char __user *optval, int __user *optlen)
1428 {
1429 struct sock *sk = sock->sk;
1430 struct iucv_sock *iucv = iucv_sk(sk);
1431 int val, len;
1432
1433 if (level != SOL_IUCV)
1434 return -ENOPROTOOPT;
1435
1436 if (get_user(len, optlen))
1437 return -EFAULT;
1438
1439 if (len < 0)
1440 return -EINVAL;
1441
1442 len = min_t(unsigned int, len, sizeof(int));
1443
1444 switch (optname) {
1445 case SO_IPRMDATA_MSG:
1446 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1447 break;
1448 case SO_MSGLIMIT:
1449 lock_sock(sk);
1450 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1451 : iucv->msglimit; /* default */
1452 release_sock(sk);
1453 break;
1454 default:
1455 return -ENOPROTOOPT;
1456 }
1457
1458 if (put_user(len, optlen))
1459 return -EFAULT;
1460 if (copy_to_user(optval, &val, len))
1461 return -EFAULT;
1462
1463 return 0;
1464 }
1465
1466
1467 /* Callback wrappers - called from iucv base support */
1468 static int iucv_callback_connreq(struct iucv_path *path,
1469 u8 ipvmid[8], u8 ipuser[16])
1470 {
1471 unsigned char user_data[16];
1472 unsigned char nuser_data[16];
1473 unsigned char src_name[8];
1474 struct hlist_node *node;
1475 struct sock *sk, *nsk;
1476 struct iucv_sock *iucv, *niucv;
1477 int err;
1478
1479 memcpy(src_name, ipuser, 8);
1480 EBCASC(src_name, 8);
1481 /* Find out if this path belongs to af_iucv. */
1482 read_lock(&iucv_sk_list.lock);
1483 iucv = NULL;
1484 sk = NULL;
1485 sk_for_each(sk, node, &iucv_sk_list.head)
1486 if (sk->sk_state == IUCV_LISTEN &&
1487 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1488 /*
1489 * Found a listening socket with
1490 * src_name == ipuser[0-7].
1491 */
1492 iucv = iucv_sk(sk);
1493 break;
1494 }
1495 read_unlock(&iucv_sk_list.lock);
1496 if (!iucv)
1497 /* No socket found, not one of our paths. */
1498 return -EINVAL;
1499
1500 bh_lock_sock(sk);
1501
1502 /* Check if parent socket is listening */
1503 low_nmcpy(user_data, iucv->src_name);
1504 high_nmcpy(user_data, iucv->dst_name);
1505 ASCEBC(user_data, sizeof(user_data));
1506 if (sk->sk_state != IUCV_LISTEN) {
1507 err = iucv_path_sever(path, user_data);
1508 iucv_path_free(path);
1509 goto fail;
1510 }
1511
1512 /* Check for backlog size */
1513 if (sk_acceptq_is_full(sk)) {
1514 err = iucv_path_sever(path, user_data);
1515 iucv_path_free(path);
1516 goto fail;
1517 }
1518
1519 /* Create the new socket */
1520 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1521 if (!nsk) {
1522 err = iucv_path_sever(path, user_data);
1523 iucv_path_free(path);
1524 goto fail;
1525 }
1526
1527 niucv = iucv_sk(nsk);
1528 iucv_sock_init(nsk, sk);
1529
1530 /* Set the new iucv_sock */
1531 memcpy(niucv->dst_name, ipuser + 8, 8);
1532 EBCASC(niucv->dst_name, 8);
1533 memcpy(niucv->dst_user_id, ipvmid, 8);
1534 memcpy(niucv->src_name, iucv->src_name, 8);
1535 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1536 niucv->path = path;
1537
1538 /* Call iucv_accept */
1539 high_nmcpy(nuser_data, ipuser + 8);
1540 memcpy(nuser_data + 8, niucv->src_name, 8);
1541 ASCEBC(nuser_data + 8, 8);
1542
1543 /* set message limit for path based on msglimit of accepting socket */
1544 niucv->msglimit = iucv->msglimit;
1545 path->msglim = iucv->msglimit;
1546 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1547 if (err) {
1548 err = iucv_path_sever(path, user_data);
1549 iucv_path_free(path);
1550 iucv_sock_kill(nsk);
1551 goto fail;
1552 }
1553
1554 iucv_accept_enqueue(sk, nsk);
1555
1556 /* Wake up accept */
1557 nsk->sk_state = IUCV_CONNECTED;
1558 sk->sk_data_ready(sk, 1);
1559 err = 0;
1560 fail:
1561 bh_unlock_sock(sk);
1562 return 0;
1563 }
1564
1565 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1566 {
1567 struct sock *sk = path->private;
1568
1569 sk->sk_state = IUCV_CONNECTED;
1570 sk->sk_state_change(sk);
1571 }
1572
1573 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1574 {
1575 struct sock *sk = path->private;
1576 struct iucv_sock *iucv = iucv_sk(sk);
1577 struct sk_buff *skb;
1578 struct sock_msg_q *save_msg;
1579 int len;
1580
1581 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1582 iucv_message_reject(path, msg);
1583 return;
1584 }
1585
1586 spin_lock(&iucv->message_q.lock);
1587
1588 if (!list_empty(&iucv->message_q.list) ||
1589 !skb_queue_empty(&iucv->backlog_skb_q))
1590 goto save_message;
1591
1592 len = atomic_read(&sk->sk_rmem_alloc);
1593 len += iucv_msg_length(msg) + sizeof(struct sk_buff);
1594 if (len > sk->sk_rcvbuf)
1595 goto save_message;
1596
1597 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1598 if (!skb)
1599 goto save_message;
1600
1601 iucv_process_message(sk, skb, path, msg);
1602 goto out_unlock;
1603
1604 save_message:
1605 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1606 if (!save_msg)
1607 return;
1608 save_msg->path = path;
1609 save_msg->msg = *msg;
1610
1611 list_add_tail(&save_msg->list, &iucv->message_q.list);
1612
1613 out_unlock:
1614 spin_unlock(&iucv->message_q.lock);
1615 }
1616
1617 static void iucv_callback_txdone(struct iucv_path *path,
1618 struct iucv_message *msg)
1619 {
1620 struct sock *sk = path->private;
1621 struct sk_buff *this = NULL;
1622 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1623 struct sk_buff *list_skb = list->next;
1624 unsigned long flags;
1625
1626 if (!skb_queue_empty(list)) {
1627 spin_lock_irqsave(&list->lock, flags);
1628
1629 while (list_skb != (struct sk_buff *)list) {
1630 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1631 this = list_skb;
1632 break;
1633 }
1634 list_skb = list_skb->next;
1635 }
1636 if (this)
1637 __skb_unlink(this, list);
1638
1639 spin_unlock_irqrestore(&list->lock, flags);
1640
1641 if (this) {
1642 kfree_skb(this);
1643 /* wake up any process waiting for sending */
1644 iucv_sock_wake_msglim(sk);
1645 }
1646 }
1647 BUG_ON(!this);
1648
1649 if (sk->sk_state == IUCV_CLOSING) {
1650 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1651 sk->sk_state = IUCV_CLOSED;
1652 sk->sk_state_change(sk);
1653 }
1654 }
1655
1656 }
1657
1658 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1659 {
1660 struct sock *sk = path->private;
1661
1662 if (!list_empty(&iucv_sk(sk)->accept_q))
1663 sk->sk_state = IUCV_SEVERED;
1664 else
1665 sk->sk_state = IUCV_DISCONN;
1666
1667 sk->sk_state_change(sk);
1668 }
1669
1670 /* called if the other communication side shuts down its RECV direction;
1671 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1672 */
1673 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1674 {
1675 struct sock *sk = path->private;
1676
1677 bh_lock_sock(sk);
1678 if (sk->sk_state != IUCV_CLOSED) {
1679 sk->sk_shutdown |= SEND_SHUTDOWN;
1680 sk->sk_state_change(sk);
1681 }
1682 bh_unlock_sock(sk);
1683 }
1684
1685 static struct proto_ops iucv_sock_ops = {
1686 .family = PF_IUCV,
1687 .owner = THIS_MODULE,
1688 .release = iucv_sock_release,
1689 .bind = iucv_sock_bind,
1690 .connect = iucv_sock_connect,
1691 .listen = iucv_sock_listen,
1692 .accept = iucv_sock_accept,
1693 .getname = iucv_sock_getname,
1694 .sendmsg = iucv_sock_sendmsg,
1695 .recvmsg = iucv_sock_recvmsg,
1696 .poll = iucv_sock_poll,
1697 .ioctl = sock_no_ioctl,
1698 .mmap = sock_no_mmap,
1699 .socketpair = sock_no_socketpair,
1700 .shutdown = iucv_sock_shutdown,
1701 .setsockopt = iucv_sock_setsockopt,
1702 .getsockopt = iucv_sock_getsockopt,
1703 };
1704
1705 static struct net_proto_family iucv_sock_family_ops = {
1706 .family = AF_IUCV,
1707 .owner = THIS_MODULE,
1708 .create = iucv_sock_create,
1709 };
1710
1711 static int __init afiucv_init(void)
1712 {
1713 int err;
1714
1715 if (!MACHINE_IS_VM) {
1716 pr_err("The af_iucv module cannot be loaded"
1717 " without z/VM\n");
1718 err = -EPROTONOSUPPORT;
1719 goto out;
1720 }
1721 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1722 if (unlikely(err)) {
1723 WARN_ON(err);
1724 err = -EPROTONOSUPPORT;
1725 goto out;
1726 }
1727
1728 err = iucv_register(&af_iucv_handler, 0);
1729 if (err)
1730 goto out;
1731 err = proto_register(&iucv_proto, 0);
1732 if (err)
1733 goto out_iucv;
1734 err = sock_register(&iucv_sock_family_ops);
1735 if (err)
1736 goto out_proto;
1737 /* establish dummy device */
1738 err = driver_register(&af_iucv_driver);
1739 if (err)
1740 goto out_sock;
1741 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
1742 if (!af_iucv_dev) {
1743 err = -ENOMEM;
1744 goto out_driver;
1745 }
1746 dev_set_name(af_iucv_dev, "af_iucv");
1747 af_iucv_dev->bus = &iucv_bus;
1748 af_iucv_dev->parent = iucv_root;
1749 af_iucv_dev->release = (void (*)(struct device *))kfree;
1750 af_iucv_dev->driver = &af_iucv_driver;
1751 err = device_register(af_iucv_dev);
1752 if (err)
1753 goto out_driver;
1754
1755 return 0;
1756
1757 out_driver:
1758 driver_unregister(&af_iucv_driver);
1759 out_sock:
1760 sock_unregister(PF_IUCV);
1761 out_proto:
1762 proto_unregister(&iucv_proto);
1763 out_iucv:
1764 iucv_unregister(&af_iucv_handler, 0);
1765 out:
1766 return err;
1767 }
1768
1769 static void __exit afiucv_exit(void)
1770 {
1771 device_unregister(af_iucv_dev);
1772 driver_unregister(&af_iucv_driver);
1773 sock_unregister(PF_IUCV);
1774 proto_unregister(&iucv_proto);
1775 iucv_unregister(&af_iucv_handler, 0);
1776 }
1777
1778 module_init(afiucv_init);
1779 module_exit(afiucv_exit);
1780
1781 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1782 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1783 MODULE_VERSION(VERSION);
1784 MODULE_LICENSE("GPL");
1785 MODULE_ALIAS_NETPROTO(PF_IUCV);
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