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checkpatch: if should not continue a preceeding brace
[linux-2.6/mini2440.git] / net / iucv / af_iucv.c
blobeb8a2a0b6eb71fc10671097563e71c3b7ae97ed9
1 /*
2 * linux/net/iucv/af_iucv.c
3 *
4 * IUCV protocol stack for Linux on zSeries
5 *
6 * Copyright 2006 IBM Corporation
7 *
8 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
9 */
10
11 #define KMSG_COMPONENT "af_iucv"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/list.h>
17 #include <linux/errno.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/skbuff.h>
22 #include <linux/init.h>
23 #include <linux/poll.h>
24 #include <net/sock.h>
25 #include <asm/ebcdic.h>
26 #include <asm/cpcmd.h>
27 #include <linux/kmod.h>
28
29 #include <net/iucv/iucv.h>
30 #include <net/iucv/af_iucv.h>
31
32 #define CONFIG_IUCV_SOCK_DEBUG 1
33
34 #define IPRMDATA 0x80
35 #define VERSION "1.0"
36
37 static char iucv_userid[80];
38
39 static struct proto_ops iucv_sock_ops;
40
41 static struct proto iucv_proto = {
42 .name = "AF_IUCV",
43 .owner = THIS_MODULE,
44 .obj_size = sizeof(struct iucv_sock),
45 };
46
47 static void iucv_sock_kill(struct sock *sk);
48 static void iucv_sock_close(struct sock *sk);
49
50 /* Call Back functions */
51 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
52 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
53 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
54 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
55 u8 ipuser[16]);
56 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
57
58 static struct iucv_sock_list iucv_sk_list = {
59 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
60 .autobind_name = ATOMIC_INIT(0)
61 };
62
63 static struct iucv_handler af_iucv_handler = {
64 .path_pending = iucv_callback_connreq,
65 .path_complete = iucv_callback_connack,
66 .path_severed = iucv_callback_connrej,
67 .message_pending = iucv_callback_rx,
68 .message_complete = iucv_callback_txdone
69 };
70
71 static inline void high_nmcpy(unsigned char *dst, char *src)
72 {
73 memcpy(dst, src, 8);
74 }
75
76 static inline void low_nmcpy(unsigned char *dst, char *src)
77 {
78 memcpy(&dst[8], src, 8);
79 }
80
81 /* Timers */
82 static void iucv_sock_timeout(unsigned long arg)
83 {
84 struct sock *sk = (struct sock *)arg;
85
86 bh_lock_sock(sk);
87 sk->sk_err = ETIMEDOUT;
88 sk->sk_state_change(sk);
89 bh_unlock_sock(sk);
90
91 iucv_sock_kill(sk);
92 sock_put(sk);
93 }
94
95 static void iucv_sock_clear_timer(struct sock *sk)
96 {
97 sk_stop_timer(sk, &sk->sk_timer);
98 }
99
100 static struct sock *__iucv_get_sock_by_name(char *nm)
101 {
102 struct sock *sk;
103 struct hlist_node *node;
104
105 sk_for_each(sk, node, &iucv_sk_list.head)
106 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
107 return sk;
108
109 return NULL;
110 }
111
112 static void iucv_sock_destruct(struct sock *sk)
113 {
114 skb_queue_purge(&sk->sk_receive_queue);
115 skb_queue_purge(&sk->sk_write_queue);
116 }
117
118 /* Cleanup Listen */
119 static void iucv_sock_cleanup_listen(struct sock *parent)
120 {
121 struct sock *sk;
122
123 /* Close non-accepted connections */
124 while ((sk = iucv_accept_dequeue(parent, NULL))) {
125 iucv_sock_close(sk);
126 iucv_sock_kill(sk);
127 }
128
129 parent->sk_state = IUCV_CLOSED;
130 sock_set_flag(parent, SOCK_ZAPPED);
131 }
132
133 /* Kill socket */
134 static void iucv_sock_kill(struct sock *sk)
135 {
136 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
137 return;
138
139 iucv_sock_unlink(&iucv_sk_list, sk);
140 sock_set_flag(sk, SOCK_DEAD);
141 sock_put(sk);
142 }
143
144 /* Close an IUCV socket */
145 static void iucv_sock_close(struct sock *sk)
146 {
147 unsigned char user_data[16];
148 struct iucv_sock *iucv = iucv_sk(sk);
149 int err;
150 unsigned long timeo;
151
152 iucv_sock_clear_timer(sk);
153 lock_sock(sk);
154
155 switch (sk->sk_state) {
156 case IUCV_LISTEN:
157 iucv_sock_cleanup_listen(sk);
158 break;
159
160 case IUCV_CONNECTED:
161 case IUCV_DISCONN:
162 err = 0;
163
164 sk->sk_state = IUCV_CLOSING;
165 sk->sk_state_change(sk);
166
167 if (!skb_queue_empty(&iucv->send_skb_q)) {
168 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
169 timeo = sk->sk_lingertime;
170 else
171 timeo = IUCV_DISCONN_TIMEOUT;
172 err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
173 }
174
175 sk->sk_state = IUCV_CLOSED;
176 sk->sk_state_change(sk);
177
178 if (iucv->path) {
179 low_nmcpy(user_data, iucv->src_name);
180 high_nmcpy(user_data, iucv->dst_name);
181 ASCEBC(user_data, sizeof(user_data));
182 err = iucv_path_sever(iucv->path, user_data);
183 iucv_path_free(iucv->path);
184 iucv->path = NULL;
185 }
186
187 sk->sk_err = ECONNRESET;
188 sk->sk_state_change(sk);
189
190 skb_queue_purge(&iucv->send_skb_q);
191 skb_queue_purge(&iucv->backlog_skb_q);
192
193 sock_set_flag(sk, SOCK_ZAPPED);
194 break;
195
196 default:
197 sock_set_flag(sk, SOCK_ZAPPED);
198 break;
199 }
200
201 release_sock(sk);
202 iucv_sock_kill(sk);
203 }
204
205 static void iucv_sock_init(struct sock *sk, struct sock *parent)
206 {
207 if (parent)
208 sk->sk_type = parent->sk_type;
209 }
210
211 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
212 {
213 struct sock *sk;
214
215 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
216 if (!sk)
217 return NULL;
218
219 sock_init_data(sock, sk);
220 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
221 spin_lock_init(&iucv_sk(sk)->accept_q_lock);
222 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
223 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
224 spin_lock_init(&iucv_sk(sk)->message_q.lock);
225 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
226 iucv_sk(sk)->send_tag = 0;
227
228 sk->sk_destruct = iucv_sock_destruct;
229 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
230 sk->sk_allocation = GFP_DMA;
231
232 sock_reset_flag(sk, SOCK_ZAPPED);
233
234 sk->sk_protocol = proto;
235 sk->sk_state = IUCV_OPEN;
236
237 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
238
239 iucv_sock_link(&iucv_sk_list, sk);
240 return sk;
241 }
242
243 /* Create an IUCV socket */
244 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
245 {
246 struct sock *sk;
247
248 if (sock->type != SOCK_STREAM)
249 return -ESOCKTNOSUPPORT;
250
251 sock->state = SS_UNCONNECTED;
252 sock->ops = &iucv_sock_ops;
253
254 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
255 if (!sk)
256 return -ENOMEM;
257
258 iucv_sock_init(sk, NULL);
259
260 return 0;
261 }
262
263 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
264 {
265 write_lock_bh(&l->lock);
266 sk_add_node(sk, &l->head);
267 write_unlock_bh(&l->lock);
268 }
269
270 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
271 {
272 write_lock_bh(&l->lock);
273 sk_del_node_init(sk);
274 write_unlock_bh(&l->lock);
275 }
276
277 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
278 {
279 unsigned long flags;
280 struct iucv_sock *par = iucv_sk(parent);
281
282 sock_hold(sk);
283 spin_lock_irqsave(&par->accept_q_lock, flags);
284 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
285 spin_unlock_irqrestore(&par->accept_q_lock, flags);
286 iucv_sk(sk)->parent = parent;
287 parent->sk_ack_backlog++;
288 }
289
290 void iucv_accept_unlink(struct sock *sk)
291 {
292 unsigned long flags;
293 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
294
295 spin_lock_irqsave(&par->accept_q_lock, flags);
296 list_del_init(&iucv_sk(sk)->accept_q);
297 spin_unlock_irqrestore(&par->accept_q_lock, flags);
298 iucv_sk(sk)->parent->sk_ack_backlog--;
299 iucv_sk(sk)->parent = NULL;
300 sock_put(sk);
301 }
302
303 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
304 {
305 struct iucv_sock *isk, *n;
306 struct sock *sk;
307
308 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
309 sk = (struct sock *) isk;
310 lock_sock(sk);
311
312 if (sk->sk_state == IUCV_CLOSED) {
313 iucv_accept_unlink(sk);
314 release_sock(sk);
315 continue;
316 }
317
318 if (sk->sk_state == IUCV_CONNECTED ||
319 sk->sk_state == IUCV_SEVERED ||
320 !newsock) {
321 iucv_accept_unlink(sk);
322 if (newsock)
323 sock_graft(sk, newsock);
324
325 if (sk->sk_state == IUCV_SEVERED)
326 sk->sk_state = IUCV_DISCONN;
327
328 release_sock(sk);
329 return sk;
330 }
331
332 release_sock(sk);
333 }
334 return NULL;
335 }
336
337 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
338 unsigned long timeo)
339 {
340 DECLARE_WAITQUEUE(wait, current);
341 int err = 0;
342
343 add_wait_queue(sk->sk_sleep, &wait);
344 while (sk->sk_state != state && sk->sk_state != state2) {
345 set_current_state(TASK_INTERRUPTIBLE);
346
347 if (!timeo) {
348 err = -EAGAIN;
349 break;
350 }
351
352 if (signal_pending(current)) {
353 err = sock_intr_errno(timeo);
354 break;
355 }
356
357 release_sock(sk);
358 timeo = schedule_timeout(timeo);
359 lock_sock(sk);
360
361 err = sock_error(sk);
362 if (err)
363 break;
364 }
365 set_current_state(TASK_RUNNING);
366 remove_wait_queue(sk->sk_sleep, &wait);
367 return err;
368 }
369
370 /* Bind an unbound socket */
371 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
372 int addr_len)
373 {
374 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
375 struct sock *sk = sock->sk;
376 struct iucv_sock *iucv;
377 int err;
378
379 /* Verify the input sockaddr */
380 if (!addr || addr->sa_family != AF_IUCV)
381 return -EINVAL;
382
383 lock_sock(sk);
384 if (sk->sk_state != IUCV_OPEN) {
385 err = -EBADFD;
386 goto done;
387 }
388
389 write_lock_bh(&iucv_sk_list.lock);
390
391 iucv = iucv_sk(sk);
392 if (__iucv_get_sock_by_name(sa->siucv_name)) {
393 err = -EADDRINUSE;
394 goto done_unlock;
395 }
396 if (iucv->path) {
397 err = 0;
398 goto done_unlock;
399 }
400
401 /* Bind the socket */
402 memcpy(iucv->src_name, sa->siucv_name, 8);
403
404 /* Copy the user id */
405 memcpy(iucv->src_user_id, iucv_userid, 8);
406 sk->sk_state = IUCV_BOUND;
407 err = 0;
408
409 done_unlock:
410 /* Release the socket list lock */
411 write_unlock_bh(&iucv_sk_list.lock);
412 done:
413 release_sock(sk);
414 return err;
415 }
416
417 /* Automatically bind an unbound socket */
418 static int iucv_sock_autobind(struct sock *sk)
419 {
420 struct iucv_sock *iucv = iucv_sk(sk);
421 char query_buffer[80];
422 char name[12];
423 int err = 0;
424
425 /* Set the userid and name */
426 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
427 if (unlikely(err))
428 return -EPROTO;
429
430 memcpy(iucv->src_user_id, query_buffer, 8);
431
432 write_lock_bh(&iucv_sk_list.lock);
433
434 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
435 while (__iucv_get_sock_by_name(name)) {
436 sprintf(name, "%08x",
437 atomic_inc_return(&iucv_sk_list.autobind_name));
438 }
439
440 write_unlock_bh(&iucv_sk_list.lock);
441
442 memcpy(&iucv->src_name, name, 8);
443
444 return err;
445 }
446
447 /* Connect an unconnected socket */
448 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
449 int alen, int flags)
450 {
451 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
452 struct sock *sk = sock->sk;
453 struct iucv_sock *iucv;
454 unsigned char user_data[16];
455 int err;
456
457 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
458 return -EINVAL;
459
460 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
461 return -EBADFD;
462
463 if (sk->sk_type != SOCK_STREAM)
464 return -EINVAL;
465
466 iucv = iucv_sk(sk);
467
468 if (sk->sk_state == IUCV_OPEN) {
469 err = iucv_sock_autobind(sk);
470 if (unlikely(err))
471 return err;
472 }
473
474 lock_sock(sk);
475
476 /* Set the destination information */
477 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
478 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
479
480 high_nmcpy(user_data, sa->siucv_name);
481 low_nmcpy(user_data, iucv_sk(sk)->src_name);
482 ASCEBC(user_data, sizeof(user_data));
483
484 iucv = iucv_sk(sk);
485 /* Create path. */
486 iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
487 IPRMDATA, GFP_KERNEL);
488 if (!iucv->path) {
489 err = -ENOMEM;
490 goto done;
491 }
492 err = iucv_path_connect(iucv->path, &af_iucv_handler,
493 sa->siucv_user_id, NULL, user_data, sk);
494 if (err) {
495 iucv_path_free(iucv->path);
496 iucv->path = NULL;
497 switch (err) {
498 case 0x0b: /* Target communicator is not logged on */
499 err = -ENETUNREACH;
500 break;
501 case 0x0d: /* Max connections for this guest exceeded */
502 case 0x0e: /* Max connections for target guest exceeded */
503 err = -EAGAIN;
504 break;
505 case 0x0f: /* Missing IUCV authorization */
506 err = -EACCES;
507 break;
508 default:
509 err = -ECONNREFUSED;
510 break;
511 }
512 goto done;
513 }
514
515 if (sk->sk_state != IUCV_CONNECTED) {
516 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
517 sock_sndtimeo(sk, flags & O_NONBLOCK));
518 }
519
520 if (sk->sk_state == IUCV_DISCONN) {
521 release_sock(sk);
522 return -ECONNREFUSED;
523 }
524
525 if (err) {
526 iucv_path_sever(iucv->path, NULL);
527 iucv_path_free(iucv->path);
528 iucv->path = NULL;
529 }
530
531 done:
532 release_sock(sk);
533 return err;
534 }
535
536 /* Move a socket into listening state. */
537 static int iucv_sock_listen(struct socket *sock, int backlog)
538 {
539 struct sock *sk = sock->sk;
540 int err;
541
542 lock_sock(sk);
543
544 err = -EINVAL;
545 if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
546 goto done;
547
548 sk->sk_max_ack_backlog = backlog;
549 sk->sk_ack_backlog = 0;
550 sk->sk_state = IUCV_LISTEN;
551 err = 0;
552
553 done:
554 release_sock(sk);
555 return err;
556 }
557
558 /* Accept a pending connection */
559 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
560 int flags)
561 {
562 DECLARE_WAITQUEUE(wait, current);
563 struct sock *sk = sock->sk, *nsk;
564 long timeo;
565 int err = 0;
566
567 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
568
569 if (sk->sk_state != IUCV_LISTEN) {
570 err = -EBADFD;
571 goto done;
572 }
573
574 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
575
576 /* Wait for an incoming connection */
577 add_wait_queue_exclusive(sk->sk_sleep, &wait);
578 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
579 set_current_state(TASK_INTERRUPTIBLE);
580 if (!timeo) {
581 err = -EAGAIN;
582 break;
583 }
584
585 release_sock(sk);
586 timeo = schedule_timeout(timeo);
587 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
588
589 if (sk->sk_state != IUCV_LISTEN) {
590 err = -EBADFD;
591 break;
592 }
593
594 if (signal_pending(current)) {
595 err = sock_intr_errno(timeo);
596 break;
597 }
598 }
599
600 set_current_state(TASK_RUNNING);
601 remove_wait_queue(sk->sk_sleep, &wait);
602
603 if (err)
604 goto done;
605
606 newsock->state = SS_CONNECTED;
607
608 done:
609 release_sock(sk);
610 return err;
611 }
612
613 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
614 int *len, int peer)
615 {
616 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
617 struct sock *sk = sock->sk;
618
619 addr->sa_family = AF_IUCV;
620 *len = sizeof(struct sockaddr_iucv);
621
622 if (peer) {
623 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
624 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
625 } else {
626 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
627 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
628 }
629 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
630 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
631 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
632
633 return 0;
634 }
635
636 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
637 struct msghdr *msg, size_t len)
638 {
639 struct sock *sk = sock->sk;
640 struct iucv_sock *iucv = iucv_sk(sk);
641 struct sk_buff *skb;
642 struct iucv_message txmsg;
643 char user_id[9];
644 char appl_id[9];
645 int err;
646
647 err = sock_error(sk);
648 if (err)
649 return err;
650
651 if (msg->msg_flags & MSG_OOB)
652 return -EOPNOTSUPP;
653
654 lock_sock(sk);
655
656 if (sk->sk_shutdown & SEND_SHUTDOWN) {
657 err = -EPIPE;
658 goto out;
659 }
660
661 if (sk->sk_state == IUCV_CONNECTED) {
662 if (!(skb = sock_alloc_send_skb(sk, len,
663 msg->msg_flags & MSG_DONTWAIT,
664 &err)))
665 goto out;
666
667 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
668 err = -EFAULT;
669 goto fail;
670 }
671
672 txmsg.class = 0;
673 memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len);
674 txmsg.tag = iucv->send_tag++;
675 memcpy(skb->cb, &txmsg.tag, 4);
676 skb_queue_tail(&iucv->send_skb_q, skb);
677 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
678 (void *) skb->data, skb->len);
679 if (err) {
680 if (err == 3) {
681 user_id[8] = 0;
682 memcpy(user_id, iucv->dst_user_id, 8);
683 appl_id[8] = 0;
684 memcpy(appl_id, iucv->dst_name, 8);
685 pr_err("Application %s on z/VM guest %s"
686 " exceeds message limit\n",
687 user_id, appl_id);
688 }
689 skb_unlink(skb, &iucv->send_skb_q);
690 err = -EPIPE;
691 goto fail;
692 }
693
694 } else {
695 err = -ENOTCONN;
696 goto out;
697 }
698
699 release_sock(sk);
700 return len;
701
702 fail:
703 kfree_skb(skb);
704 out:
705 release_sock(sk);
706 return err;
707 }
708
709 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
710 {
711 int dataleft, size, copied = 0;
712 struct sk_buff *nskb;
713
714 dataleft = len;
715 while (dataleft) {
716 if (dataleft >= sk->sk_rcvbuf / 4)
717 size = sk->sk_rcvbuf / 4;
718 else
719 size = dataleft;
720
721 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
722 if (!nskb)
723 return -ENOMEM;
724
725 memcpy(nskb->data, skb->data + copied, size);
726 copied += size;
727 dataleft -= size;
728
729 skb_reset_transport_header(nskb);
730 skb_reset_network_header(nskb);
731 nskb->len = size;
732
733 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
734 }
735
736 return 0;
737 }
738
739 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
740 struct iucv_path *path,
741 struct iucv_message *msg)
742 {
743 int rc;
744
745 if (msg->flags & IPRMDATA) {
746 skb->data = NULL;
747 skb->len = 0;
748 } else {
749 rc = iucv_message_receive(path, msg, 0, skb->data,
750 msg->length, NULL);
751 if (rc) {
752 kfree_skb(skb);
753 return;
754 }
755 if (skb->truesize >= sk->sk_rcvbuf / 4) {
756 rc = iucv_fragment_skb(sk, skb, msg->length);
757 kfree_skb(skb);
758 skb = NULL;
759 if (rc) {
760 iucv_path_sever(path, NULL);
761 return;
762 }
763 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
764 } else {
765 skb_reset_transport_header(skb);
766 skb_reset_network_header(skb);
767 skb->len = msg->length;
768 }
769 }
770
771 if (sock_queue_rcv_skb(sk, skb))
772 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
773 }
774
775 static void iucv_process_message_q(struct sock *sk)
776 {
777 struct iucv_sock *iucv = iucv_sk(sk);
778 struct sk_buff *skb;
779 struct sock_msg_q *p, *n;
780
781 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
782 skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
783 if (!skb)
784 break;
785 iucv_process_message(sk, skb, p->path, &p->msg);
786 list_del(&p->list);
787 kfree(p);
788 if (!skb_queue_empty(&iucv->backlog_skb_q))
789 break;
790 }
791 }
792
793 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
794 struct msghdr *msg, size_t len, int flags)
795 {
796 int noblock = flags & MSG_DONTWAIT;
797 struct sock *sk = sock->sk;
798 struct iucv_sock *iucv = iucv_sk(sk);
799 int target, copied = 0;
800 struct sk_buff *skb, *rskb, *cskb;
801 int err = 0;
802
803 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
804 skb_queue_empty(&iucv->backlog_skb_q) &&
805 skb_queue_empty(&sk->sk_receive_queue) &&
806 list_empty(&iucv->message_q.list))
807 return 0;
808
809 if (flags & (MSG_OOB))
810 return -EOPNOTSUPP;
811
812 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
813
814 skb = skb_recv_datagram(sk, flags, noblock, &err);
815 if (!skb) {
816 if (sk->sk_shutdown & RCV_SHUTDOWN)
817 return 0;
818 return err;
819 }
820
821 copied = min_t(unsigned int, skb->len, len);
822
823 cskb = skb;
824 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
825 skb_queue_head(&sk->sk_receive_queue, skb);
826 if (copied == 0)
827 return -EFAULT;
828 goto done;
829 }
830
831 len -= copied;
832
833 /* Mark read part of skb as used */
834 if (!(flags & MSG_PEEK)) {
835 skb_pull(skb, copied);
836
837 if (skb->len) {
838 skb_queue_head(&sk->sk_receive_queue, skb);
839 goto done;
840 }
841
842 kfree_skb(skb);
843
844 /* Queue backlog skbs */
845 rskb = skb_dequeue(&iucv->backlog_skb_q);
846 while (rskb) {
847 if (sock_queue_rcv_skb(sk, rskb)) {
848 skb_queue_head(&iucv->backlog_skb_q,
849 rskb);
850 break;
851 } else {
852 rskb = skb_dequeue(&iucv->backlog_skb_q);
853 }
854 }
855 if (skb_queue_empty(&iucv->backlog_skb_q)) {
856 spin_lock_bh(&iucv->message_q.lock);
857 if (!list_empty(&iucv->message_q.list))
858 iucv_process_message_q(sk);
859 spin_unlock_bh(&iucv->message_q.lock);
860 }
861
862 } else
863 skb_queue_head(&sk->sk_receive_queue, skb);
864
865 done:
866 return err ? : copied;
867 }
868
869 static inline unsigned int iucv_accept_poll(struct sock *parent)
870 {
871 struct iucv_sock *isk, *n;
872 struct sock *sk;
873
874 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
875 sk = (struct sock *) isk;
876
877 if (sk->sk_state == IUCV_CONNECTED)
878 return POLLIN | POLLRDNORM;
879 }
880
881 return 0;
882 }
883
884 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
885 poll_table *wait)
886 {
887 struct sock *sk = sock->sk;
888 unsigned int mask = 0;
889
890 poll_wait(file, sk->sk_sleep, wait);
891
892 if (sk->sk_state == IUCV_LISTEN)
893 return iucv_accept_poll(sk);
894
895 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
896 mask |= POLLERR;
897
898 if (sk->sk_shutdown & RCV_SHUTDOWN)
899 mask |= POLLRDHUP;
900
901 if (sk->sk_shutdown == SHUTDOWN_MASK)
902 mask |= POLLHUP;
903
904 if (!skb_queue_empty(&sk->sk_receive_queue) ||
905 (sk->sk_shutdown & RCV_SHUTDOWN))
906 mask |= POLLIN | POLLRDNORM;
907
908 if (sk->sk_state == IUCV_CLOSED)
909 mask |= POLLHUP;
910
911 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
912 mask |= POLLIN;
913
914 if (sock_writeable(sk))
915 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
916 else
917 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
918
919 return mask;
920 }
921
922 static int iucv_sock_shutdown(struct socket *sock, int how)
923 {
924 struct sock *sk = sock->sk;
925 struct iucv_sock *iucv = iucv_sk(sk);
926 struct iucv_message txmsg;
927 int err = 0;
928 u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
929
930 how++;
931
932 if ((how & ~SHUTDOWN_MASK) || !how)
933 return -EINVAL;
934
935 lock_sock(sk);
936 switch (sk->sk_state) {
937 case IUCV_CLOSED:
938 err = -ENOTCONN;
939 goto fail;
940
941 default:
942 sk->sk_shutdown |= how;
943 break;
944 }
945
946 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
947 txmsg.class = 0;
948 txmsg.tag = 0;
949 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
950 (void *) prmmsg, 8);
951 if (err) {
952 switch (err) {
953 case 1:
954 err = -ENOTCONN;
955 break;
956 case 2:
957 err = -ECONNRESET;
958 break;
959 default:
960 err = -ENOTCONN;
961 break;
962 }
963 }
964 }
965
966 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
967 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
968 if (err)
969 err = -ENOTCONN;
970
971 skb_queue_purge(&sk->sk_receive_queue);
972 }
973
974 /* Wake up anyone sleeping in poll */
975 sk->sk_state_change(sk);
976
977 fail:
978 release_sock(sk);
979 return err;
980 }
981
982 static int iucv_sock_release(struct socket *sock)
983 {
984 struct sock *sk = sock->sk;
985 int err = 0;
986
987 if (!sk)
988 return 0;
989
990 iucv_sock_close(sk);
991
992 /* Unregister with IUCV base support */
993 if (iucv_sk(sk)->path) {
994 iucv_path_sever(iucv_sk(sk)->path, NULL);
995 iucv_path_free(iucv_sk(sk)->path);
996 iucv_sk(sk)->path = NULL;
997 }
998
999 sock_orphan(sk);
1000 iucv_sock_kill(sk);
1001 return err;
1002 }
1003
1004 /* Callback wrappers - called from iucv base support */
1005 static int iucv_callback_connreq(struct iucv_path *path,
1006 u8 ipvmid[8], u8 ipuser[16])
1007 {
1008 unsigned char user_data[16];
1009 unsigned char nuser_data[16];
1010 unsigned char src_name[8];
1011 struct hlist_node *node;
1012 struct sock *sk, *nsk;
1013 struct iucv_sock *iucv, *niucv;
1014 int err;
1015
1016 memcpy(src_name, ipuser, 8);
1017 EBCASC(src_name, 8);
1018 /* Find out if this path belongs to af_iucv. */
1019 read_lock(&iucv_sk_list.lock);
1020 iucv = NULL;
1021 sk = NULL;
1022 sk_for_each(sk, node, &iucv_sk_list.head)
1023 if (sk->sk_state == IUCV_LISTEN &&
1024 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1025 /*
1026 * Found a listening socket with
1027 * src_name == ipuser[0-7].
1028 */
1029 iucv = iucv_sk(sk);
1030 break;
1031 }
1032 read_unlock(&iucv_sk_list.lock);
1033 if (!iucv)
1034 /* No socket found, not one of our paths. */
1035 return -EINVAL;
1036
1037 bh_lock_sock(sk);
1038
1039 /* Check if parent socket is listening */
1040 low_nmcpy(user_data, iucv->src_name);
1041 high_nmcpy(user_data, iucv->dst_name);
1042 ASCEBC(user_data, sizeof(user_data));
1043 if (sk->sk_state != IUCV_LISTEN) {
1044 err = iucv_path_sever(path, user_data);
1045 iucv_path_free(path);
1046 goto fail;
1047 }
1048
1049 /* Check for backlog size */
1050 if (sk_acceptq_is_full(sk)) {
1051 err = iucv_path_sever(path, user_data);
1052 iucv_path_free(path);
1053 goto fail;
1054 }
1055
1056 /* Create the new socket */
1057 nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
1058 if (!nsk) {
1059 err = iucv_path_sever(path, user_data);
1060 iucv_path_free(path);
1061 goto fail;
1062 }
1063
1064 niucv = iucv_sk(nsk);
1065 iucv_sock_init(nsk, sk);
1066
1067 /* Set the new iucv_sock */
1068 memcpy(niucv->dst_name, ipuser + 8, 8);
1069 EBCASC(niucv->dst_name, 8);
1070 memcpy(niucv->dst_user_id, ipvmid, 8);
1071 memcpy(niucv->src_name, iucv->src_name, 8);
1072 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1073 niucv->path = path;
1074
1075 /* Call iucv_accept */
1076 high_nmcpy(nuser_data, ipuser + 8);
1077 memcpy(nuser_data + 8, niucv->src_name, 8);
1078 ASCEBC(nuser_data + 8, 8);
1079
1080 path->msglim = IUCV_QUEUELEN_DEFAULT;
1081 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1082 if (err) {
1083 err = iucv_path_sever(path, user_data);
1084 iucv_path_free(path);
1085 iucv_sock_kill(nsk);
1086 goto fail;
1087 }
1088
1089 iucv_accept_enqueue(sk, nsk);
1090
1091 /* Wake up accept */
1092 nsk->sk_state = IUCV_CONNECTED;
1093 sk->sk_data_ready(sk, 1);
1094 err = 0;
1095 fail:
1096 bh_unlock_sock(sk);
1097 return 0;
1098 }
1099
1100 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1101 {
1102 struct sock *sk = path->private;
1103
1104 sk->sk_state = IUCV_CONNECTED;
1105 sk->sk_state_change(sk);
1106 }
1107
1108 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1109 {
1110 struct sock *sk = path->private;
1111 struct iucv_sock *iucv = iucv_sk(sk);
1112 struct sk_buff *skb;
1113 struct sock_msg_q *save_msg;
1114 int len;
1115
1116 if (sk->sk_shutdown & RCV_SHUTDOWN)
1117 return;
1118
1119 if (!list_empty(&iucv->message_q.list) ||
1120 !skb_queue_empty(&iucv->backlog_skb_q))
1121 goto save_message;
1122
1123 len = atomic_read(&sk->sk_rmem_alloc);
1124 len += msg->length + sizeof(struct sk_buff);
1125 if (len > sk->sk_rcvbuf)
1126 goto save_message;
1127
1128 skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
1129 if (!skb)
1130 goto save_message;
1131
1132 spin_lock(&iucv->message_q.lock);
1133 iucv_process_message(sk, skb, path, msg);
1134 spin_unlock(&iucv->message_q.lock);
1135
1136 return;
1137
1138 save_message:
1139 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1140 if (!save_msg)
1141 return;
1142 save_msg->path = path;
1143 save_msg->msg = *msg;
1144
1145 spin_lock(&iucv->message_q.lock);
1146 list_add_tail(&save_msg->list, &iucv->message_q.list);
1147 spin_unlock(&iucv->message_q.lock);
1148 }
1149
1150 static void iucv_callback_txdone(struct iucv_path *path,
1151 struct iucv_message *msg)
1152 {
1153 struct sock *sk = path->private;
1154 struct sk_buff *this = NULL;
1155 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1156 struct sk_buff *list_skb = list->next;
1157 unsigned long flags;
1158
1159 if (!skb_queue_empty(list)) {
1160 spin_lock_irqsave(&list->lock, flags);
1161
1162 while (list_skb != (struct sk_buff *)list) {
1163 if (!memcmp(&msg->tag, list_skb->cb, 4)) {
1164 this = list_skb;
1165 break;
1166 }
1167 list_skb = list_skb->next;
1168 }
1169 if (this)
1170 __skb_unlink(this, list);
1171
1172 spin_unlock_irqrestore(&list->lock, flags);
1173
1174 if (this)
1175 kfree_skb(this);
1176 }
1177 BUG_ON(!this);
1178
1179 if (sk->sk_state == IUCV_CLOSING) {
1180 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1181 sk->sk_state = IUCV_CLOSED;
1182 sk->sk_state_change(sk);
1183 }
1184 }
1185
1186 }
1187
1188 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1189 {
1190 struct sock *sk = path->private;
1191
1192 if (!list_empty(&iucv_sk(sk)->accept_q))
1193 sk->sk_state = IUCV_SEVERED;
1194 else
1195 sk->sk_state = IUCV_DISCONN;
1196
1197 sk->sk_state_change(sk);
1198 }
1199
1200 static struct proto_ops iucv_sock_ops = {
1201 .family = PF_IUCV,
1202 .owner = THIS_MODULE,
1203 .release = iucv_sock_release,
1204 .bind = iucv_sock_bind,
1205 .connect = iucv_sock_connect,
1206 .listen = iucv_sock_listen,
1207 .accept = iucv_sock_accept,
1208 .getname = iucv_sock_getname,
1209 .sendmsg = iucv_sock_sendmsg,
1210 .recvmsg = iucv_sock_recvmsg,
1211 .poll = iucv_sock_poll,
1212 .ioctl = sock_no_ioctl,
1213 .mmap = sock_no_mmap,
1214 .socketpair = sock_no_socketpair,
1215 .shutdown = iucv_sock_shutdown,
1216 .setsockopt = sock_no_setsockopt,
1217 .getsockopt = sock_no_getsockopt
1218 };
1219
1220 static struct net_proto_family iucv_sock_family_ops = {
1221 .family = AF_IUCV,
1222 .owner = THIS_MODULE,
1223 .create = iucv_sock_create,
1224 };
1225
1226 static int __init afiucv_init(void)
1227 {
1228 int err;
1229
1230 if (!MACHINE_IS_VM) {
1231 pr_err("The af_iucv module cannot be loaded"
1232 " without z/VM\n");
1233 err = -EPROTONOSUPPORT;
1234 goto out;
1235 }
1236 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1237 if (unlikely(err)) {
1238 WARN_ON(err);
1239 err = -EPROTONOSUPPORT;
1240 goto out;
1241 }
1242
1243 err = iucv_register(&af_iucv_handler, 0);
1244 if (err)
1245 goto out;
1246 err = proto_register(&iucv_proto, 0);
1247 if (err)
1248 goto out_iucv;
1249 err = sock_register(&iucv_sock_family_ops);
1250 if (err)
1251 goto out_proto;
1252 return 0;
1253
1254 out_proto:
1255 proto_unregister(&iucv_proto);
1256 out_iucv:
1257 iucv_unregister(&af_iucv_handler, 0);
1258 out:
1259 return err;
1260 }
1261
1262 static void __exit afiucv_exit(void)
1263 {
1264 sock_unregister(PF_IUCV);
1265 proto_unregister(&iucv_proto);
1266 iucv_unregister(&af_iucv_handler, 0);
1267 }
1268
1269 module_init(afiucv_init);
1270 module_exit(afiucv_exit);
1271
1272 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1273 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1274 MODULE_VERSION(VERSION);
1275 MODULE_LICENSE("GPL");
1276 MODULE_ALIAS_NETPROTO(PF_IUCV);
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