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spi: spi_bfin cleanups, error handling
[pv_ops_mirror.git] / net / iucv / af_iucv.c
blobaef6645803559c0e0695574a731dad158fa8a091
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 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/list.h>
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/sched.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/poll.h>
21 #include <net/sock.h>
22 #include <asm/ebcdic.h>
23 #include <asm/cpcmd.h>
24 #include <linux/kmod.h>
25
26 #include <net/iucv/iucv.h>
27 #include <net/iucv/af_iucv.h>
28
29 #define CONFIG_IUCV_SOCK_DEBUG 1
30
31 #define IPRMDATA 0x80
32 #define VERSION "1.0"
33
34 static char iucv_userid[80];
35
36 static struct proto_ops iucv_sock_ops;
37
38 static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42 };
43
44 static void iucv_sock_kill(struct sock *sk);
45 static void iucv_sock_close(struct sock *sk);
46
47 /* Call Back functions */
48 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
49 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
50 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
51 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
52 u8 ipuser[16]);
53 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
54
55 static struct iucv_sock_list iucv_sk_list = {
56 .lock = RW_LOCK_UNLOCKED,
57 .autobind_name = ATOMIC_INIT(0)
58 };
59
60 static struct iucv_handler af_iucv_handler = {
61 .path_pending = iucv_callback_connreq,
62 .path_complete = iucv_callback_connack,
63 .path_severed = iucv_callback_connrej,
64 .message_pending = iucv_callback_rx,
65 .message_complete = iucv_callback_txdone
66 };
67
68 static inline void high_nmcpy(unsigned char *dst, char *src)
69 {
70 memcpy(dst, src, 8);
71 }
72
73 static inline void low_nmcpy(unsigned char *dst, char *src)
74 {
75 memcpy(&dst[8], src, 8);
76 }
77
78 /* Timers */
79 static void iucv_sock_timeout(unsigned long arg)
80 {
81 struct sock *sk = (struct sock *)arg;
82
83 bh_lock_sock(sk);
84 sk->sk_err = ETIMEDOUT;
85 sk->sk_state_change(sk);
86 bh_unlock_sock(sk);
87
88 iucv_sock_kill(sk);
89 sock_put(sk);
90 }
91
92 static void iucv_sock_clear_timer(struct sock *sk)
93 {
94 sk_stop_timer(sk, &sk->sk_timer);
95 }
96
97 static void iucv_sock_init_timer(struct sock *sk)
98 {
99 init_timer(&sk->sk_timer);
100 sk->sk_timer.function = iucv_sock_timeout;
101 sk->sk_timer.data = (unsigned long)sk;
102 }
103
104 static struct sock *__iucv_get_sock_by_name(char *nm)
105 {
106 struct sock *sk;
107 struct hlist_node *node;
108
109 sk_for_each(sk, node, &iucv_sk_list.head)
110 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
111 return sk;
112
113 return NULL;
114 }
115
116 static void iucv_sock_destruct(struct sock *sk)
117 {
118 skb_queue_purge(&sk->sk_receive_queue);
119 skb_queue_purge(&sk->sk_write_queue);
120 }
121
122 /* Cleanup Listen */
123 static void iucv_sock_cleanup_listen(struct sock *parent)
124 {
125 struct sock *sk;
126
127 /* Close non-accepted connections */
128 while ((sk = iucv_accept_dequeue(parent, NULL))) {
129 iucv_sock_close(sk);
130 iucv_sock_kill(sk);
131 }
132
133 parent->sk_state = IUCV_CLOSED;
134 sock_set_flag(parent, SOCK_ZAPPED);
135 }
136
137 /* Kill socket */
138 static void iucv_sock_kill(struct sock *sk)
139 {
140 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
141 return;
142
143 iucv_sock_unlink(&iucv_sk_list, sk);
144 sock_set_flag(sk, SOCK_DEAD);
145 sock_put(sk);
146 }
147
148 /* Close an IUCV socket */
149 static void iucv_sock_close(struct sock *sk)
150 {
151 unsigned char user_data[16];
152 struct iucv_sock *iucv = iucv_sk(sk);
153 int err;
154 unsigned long timeo;
155
156 iucv_sock_clear_timer(sk);
157 lock_sock(sk);
158
159 switch (sk->sk_state) {
160 case IUCV_LISTEN:
161 iucv_sock_cleanup_listen(sk);
162 break;
163
164 case IUCV_CONNECTED:
165 case IUCV_DISCONN:
166 err = 0;
167
168 sk->sk_state = IUCV_CLOSING;
169 sk->sk_state_change(sk);
170
171 if (!skb_queue_empty(&iucv->send_skb_q)) {
172 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
173 timeo = sk->sk_lingertime;
174 else
175 timeo = IUCV_DISCONN_TIMEOUT;
176 err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
177 }
178
179 sk->sk_state = IUCV_CLOSED;
180 sk->sk_state_change(sk);
181
182 if (iucv->path) {
183 low_nmcpy(user_data, iucv->src_name);
184 high_nmcpy(user_data, iucv->dst_name);
185 ASCEBC(user_data, sizeof(user_data));
186 err = iucv_path_sever(iucv->path, user_data);
187 iucv_path_free(iucv->path);
188 iucv->path = NULL;
189 }
190
191 sk->sk_err = ECONNRESET;
192 sk->sk_state_change(sk);
193
194 skb_queue_purge(&iucv->send_skb_q);
195 skb_queue_purge(&iucv->backlog_skb_q);
196
197 sock_set_flag(sk, SOCK_ZAPPED);
198 break;
199
200 default:
201 sock_set_flag(sk, SOCK_ZAPPED);
202 break;
203 }
204
205 release_sock(sk);
206 iucv_sock_kill(sk);
207 }
208
209 static void iucv_sock_init(struct sock *sk, struct sock *parent)
210 {
211 if (parent)
212 sk->sk_type = parent->sk_type;
213 }
214
215 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
216 {
217 struct sock *sk;
218
219 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
220 if (!sk)
221 return NULL;
222
223 sock_init_data(sock, sk);
224 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
225 spin_lock_init(&iucv_sk(sk)->accept_q_lock);
226 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
227 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
228 spin_lock_init(&iucv_sk(sk)->message_q.lock);
229 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
230 iucv_sk(sk)->send_tag = 0;
231
232 sk->sk_destruct = iucv_sock_destruct;
233 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
234 sk->sk_allocation = GFP_DMA;
235
236 sock_reset_flag(sk, SOCK_ZAPPED);
237
238 sk->sk_protocol = proto;
239 sk->sk_state = IUCV_OPEN;
240
241 iucv_sock_init_timer(sk);
242
243 iucv_sock_link(&iucv_sk_list, sk);
244 return sk;
245 }
246
247 /* Create an IUCV socket */
248 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
249 {
250 struct sock *sk;
251
252 if (sock->type != SOCK_STREAM)
253 return -ESOCKTNOSUPPORT;
254
255 sock->state = SS_UNCONNECTED;
256 sock->ops = &iucv_sock_ops;
257
258 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
259 if (!sk)
260 return -ENOMEM;
261
262 iucv_sock_init(sk, NULL);
263
264 return 0;
265 }
266
267 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
268 {
269 write_lock_bh(&l->lock);
270 sk_add_node(sk, &l->head);
271 write_unlock_bh(&l->lock);
272 }
273
274 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
275 {
276 write_lock_bh(&l->lock);
277 sk_del_node_init(sk);
278 write_unlock_bh(&l->lock);
279 }
280
281 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
282 {
283 unsigned long flags;
284 struct iucv_sock *par = iucv_sk(parent);
285
286 sock_hold(sk);
287 spin_lock_irqsave(&par->accept_q_lock, flags);
288 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
289 spin_unlock_irqrestore(&par->accept_q_lock, flags);
290 iucv_sk(sk)->parent = parent;
291 parent->sk_ack_backlog++;
292 }
293
294 void iucv_accept_unlink(struct sock *sk)
295 {
296 unsigned long flags;
297 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
298
299 spin_lock_irqsave(&par->accept_q_lock, flags);
300 list_del_init(&iucv_sk(sk)->accept_q);
301 spin_unlock_irqrestore(&par->accept_q_lock, flags);
302 iucv_sk(sk)->parent->sk_ack_backlog--;
303 iucv_sk(sk)->parent = NULL;
304 sock_put(sk);
305 }
306
307 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
308 {
309 struct iucv_sock *isk, *n;
310 struct sock *sk;
311
312 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
313 sk = (struct sock *) isk;
314 lock_sock(sk);
315
316 if (sk->sk_state == IUCV_CLOSED) {
317 iucv_accept_unlink(sk);
318 release_sock(sk);
319 continue;
320 }
321
322 if (sk->sk_state == IUCV_CONNECTED ||
323 sk->sk_state == IUCV_SEVERED ||
324 !newsock) {
325 iucv_accept_unlink(sk);
326 if (newsock)
327 sock_graft(sk, newsock);
328
329 if (sk->sk_state == IUCV_SEVERED)
330 sk->sk_state = IUCV_DISCONN;
331
332 release_sock(sk);
333 return sk;
334 }
335
336 release_sock(sk);
337 }
338 return NULL;
339 }
340
341 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
342 unsigned long timeo)
343 {
344 DECLARE_WAITQUEUE(wait, current);
345 int err = 0;
346
347 add_wait_queue(sk->sk_sleep, &wait);
348 while (sk->sk_state != state && sk->sk_state != state2) {
349 set_current_state(TASK_INTERRUPTIBLE);
350
351 if (!timeo) {
352 err = -EAGAIN;
353 break;
354 }
355
356 if (signal_pending(current)) {
357 err = sock_intr_errno(timeo);
358 break;
359 }
360
361 release_sock(sk);
362 timeo = schedule_timeout(timeo);
363 lock_sock(sk);
364
365 err = sock_error(sk);
366 if (err)
367 break;
368 }
369 set_current_state(TASK_RUNNING);
370 remove_wait_queue(sk->sk_sleep, &wait);
371 return err;
372 }
373
374 /* Bind an unbound socket */
375 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
376 int addr_len)
377 {
378 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
379 struct sock *sk = sock->sk;
380 struct iucv_sock *iucv;
381 int err;
382
383 /* Verify the input sockaddr */
384 if (!addr || addr->sa_family != AF_IUCV)
385 return -EINVAL;
386
387 lock_sock(sk);
388 if (sk->sk_state != IUCV_OPEN) {
389 err = -EBADFD;
390 goto done;
391 }
392
393 write_lock_bh(&iucv_sk_list.lock);
394
395 iucv = iucv_sk(sk);
396 if (__iucv_get_sock_by_name(sa->siucv_name)) {
397 err = -EADDRINUSE;
398 goto done_unlock;
399 }
400 if (iucv->path) {
401 err = 0;
402 goto done_unlock;
403 }
404
405 /* Bind the socket */
406 memcpy(iucv->src_name, sa->siucv_name, 8);
407
408 /* Copy the user id */
409 memcpy(iucv->src_user_id, iucv_userid, 8);
410 sk->sk_state = IUCV_BOUND;
411 err = 0;
412
413 done_unlock:
414 /* Release the socket list lock */
415 write_unlock_bh(&iucv_sk_list.lock);
416 done:
417 release_sock(sk);
418 return err;
419 }
420
421 /* Automatically bind an unbound socket */
422 static int iucv_sock_autobind(struct sock *sk)
423 {
424 struct iucv_sock *iucv = iucv_sk(sk);
425 char query_buffer[80];
426 char name[12];
427 int err = 0;
428
429 /* Set the userid and name */
430 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
431 if (unlikely(err))
432 return -EPROTO;
433
434 memcpy(iucv->src_user_id, query_buffer, 8);
435
436 write_lock_bh(&iucv_sk_list.lock);
437
438 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
439 while (__iucv_get_sock_by_name(name)) {
440 sprintf(name, "%08x",
441 atomic_inc_return(&iucv_sk_list.autobind_name));
442 }
443
444 write_unlock_bh(&iucv_sk_list.lock);
445
446 memcpy(&iucv->src_name, name, 8);
447
448 return err;
449 }
450
451 /* Connect an unconnected socket */
452 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
453 int alen, int flags)
454 {
455 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
456 struct sock *sk = sock->sk;
457 struct iucv_sock *iucv;
458 unsigned char user_data[16];
459 int err;
460
461 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
462 return -EINVAL;
463
464 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
465 return -EBADFD;
466
467 if (sk->sk_type != SOCK_STREAM)
468 return -EINVAL;
469
470 iucv = iucv_sk(sk);
471
472 if (sk->sk_state == IUCV_OPEN) {
473 err = iucv_sock_autobind(sk);
474 if (unlikely(err))
475 return err;
476 }
477
478 lock_sock(sk);
479
480 /* Set the destination information */
481 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
482 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
483
484 high_nmcpy(user_data, sa->siucv_name);
485 low_nmcpy(user_data, iucv_sk(sk)->src_name);
486 ASCEBC(user_data, sizeof(user_data));
487
488 iucv = iucv_sk(sk);
489 /* Create path. */
490 iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
491 IPRMDATA, GFP_KERNEL);
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 err = -ECONNREFUSED;
498 goto done;
499 }
500
501 if (sk->sk_state != IUCV_CONNECTED) {
502 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
503 sock_sndtimeo(sk, flags & O_NONBLOCK));
504 }
505
506 if (sk->sk_state == IUCV_DISCONN) {
507 release_sock(sk);
508 return -ECONNREFUSED;
509 }
510 done:
511 release_sock(sk);
512 return err;
513 }
514
515 /* Move a socket into listening state. */
516 static int iucv_sock_listen(struct socket *sock, int backlog)
517 {
518 struct sock *sk = sock->sk;
519 int err;
520
521 lock_sock(sk);
522
523 err = -EINVAL;
524 if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
525 goto done;
526
527 sk->sk_max_ack_backlog = backlog;
528 sk->sk_ack_backlog = 0;
529 sk->sk_state = IUCV_LISTEN;
530 err = 0;
531
532 done:
533 release_sock(sk);
534 return err;
535 }
536
537 /* Accept a pending connection */
538 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
539 int flags)
540 {
541 DECLARE_WAITQUEUE(wait, current);
542 struct sock *sk = sock->sk, *nsk;
543 long timeo;
544 int err = 0;
545
546 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
547
548 if (sk->sk_state != IUCV_LISTEN) {
549 err = -EBADFD;
550 goto done;
551 }
552
553 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
554
555 /* Wait for an incoming connection */
556 add_wait_queue_exclusive(sk->sk_sleep, &wait);
557 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
558 set_current_state(TASK_INTERRUPTIBLE);
559 if (!timeo) {
560 err = -EAGAIN;
561 break;
562 }
563
564 release_sock(sk);
565 timeo = schedule_timeout(timeo);
566 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
567
568 if (sk->sk_state != IUCV_LISTEN) {
569 err = -EBADFD;
570 break;
571 }
572
573 if (signal_pending(current)) {
574 err = sock_intr_errno(timeo);
575 break;
576 }
577 }
578
579 set_current_state(TASK_RUNNING);
580 remove_wait_queue(sk->sk_sleep, &wait);
581
582 if (err)
583 goto done;
584
585 newsock->state = SS_CONNECTED;
586
587 done:
588 release_sock(sk);
589 return err;
590 }
591
592 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
593 int *len, int peer)
594 {
595 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
596 struct sock *sk = sock->sk;
597
598 addr->sa_family = AF_IUCV;
599 *len = sizeof(struct sockaddr_iucv);
600
601 if (peer) {
602 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
603 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
604 } else {
605 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
606 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
607 }
608 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
609 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
610 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
611
612 return 0;
613 }
614
615 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
616 struct msghdr *msg, size_t len)
617 {
618 struct sock *sk = sock->sk;
619 struct iucv_sock *iucv = iucv_sk(sk);
620 struct sk_buff *skb;
621 struct iucv_message txmsg;
622 int err;
623
624 err = sock_error(sk);
625 if (err)
626 return err;
627
628 if (msg->msg_flags & MSG_OOB)
629 return -EOPNOTSUPP;
630
631 lock_sock(sk);
632
633 if (sk->sk_shutdown & SEND_SHUTDOWN) {
634 err = -EPIPE;
635 goto out;
636 }
637
638 if (sk->sk_state == IUCV_CONNECTED) {
639 if (!(skb = sock_alloc_send_skb(sk, len,
640 msg->msg_flags & MSG_DONTWAIT,
641 &err)))
642 goto out;
643
644 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
645 err = -EFAULT;
646 goto fail;
647 }
648
649 txmsg.class = 0;
650 txmsg.tag = iucv->send_tag++;
651 memcpy(skb->cb, &txmsg.tag, 4);
652 skb_queue_tail(&iucv->send_skb_q, skb);
653 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
654 (void *) skb->data, skb->len);
655 if (err) {
656 if (err == 3)
657 printk(KERN_ERR "AF_IUCV msg limit exceeded\n");
658 skb_unlink(skb, &iucv->send_skb_q);
659 err = -EPIPE;
660 goto fail;
661 }
662
663 } else {
664 err = -ENOTCONN;
665 goto out;
666 }
667
668 release_sock(sk);
669 return len;
670
671 fail:
672 kfree_skb(skb);
673 out:
674 release_sock(sk);
675 return err;
676 }
677
678 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
679 {
680 int dataleft, size, copied = 0;
681 struct sk_buff *nskb;
682
683 dataleft = len;
684 while (dataleft) {
685 if (dataleft >= sk->sk_rcvbuf / 4)
686 size = sk->sk_rcvbuf / 4;
687 else
688 size = dataleft;
689
690 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
691 if (!nskb)
692 return -ENOMEM;
693
694 memcpy(nskb->data, skb->data + copied, size);
695 copied += size;
696 dataleft -= size;
697
698 skb_reset_transport_header(nskb);
699 skb_reset_network_header(nskb);
700 nskb->len = size;
701
702 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
703 }
704
705 return 0;
706 }
707
708 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
709 struct iucv_path *path,
710 struct iucv_message *msg)
711 {
712 int rc;
713
714 if (msg->flags & IPRMDATA) {
715 skb->data = NULL;
716 skb->len = 0;
717 } else {
718 rc = iucv_message_receive(path, msg, 0, skb->data,
719 msg->length, NULL);
720 if (rc) {
721 kfree_skb(skb);
722 return;
723 }
724 if (skb->truesize >= sk->sk_rcvbuf / 4) {
725 rc = iucv_fragment_skb(sk, skb, msg->length);
726 kfree_skb(skb);
727 skb = NULL;
728 if (rc) {
729 iucv_path_sever(path, NULL);
730 return;
731 }
732 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
733 } else {
734 skb_reset_transport_header(skb);
735 skb_reset_network_header(skb);
736 skb->len = msg->length;
737 }
738 }
739
740 if (sock_queue_rcv_skb(sk, skb))
741 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
742 }
743
744 static void iucv_process_message_q(struct sock *sk)
745 {
746 struct iucv_sock *iucv = iucv_sk(sk);
747 struct sk_buff *skb;
748 struct sock_msg_q *p, *n;
749
750 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
751 skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
752 if (!skb)
753 break;
754 iucv_process_message(sk, skb, p->path, &p->msg);
755 list_del(&p->list);
756 kfree(p);
757 if (!skb_queue_empty(&iucv->backlog_skb_q))
758 break;
759 }
760 }
761
762 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
763 struct msghdr *msg, size_t len, int flags)
764 {
765 int noblock = flags & MSG_DONTWAIT;
766 struct sock *sk = sock->sk;
767 struct iucv_sock *iucv = iucv_sk(sk);
768 int target, copied = 0;
769 struct sk_buff *skb, *rskb, *cskb;
770 int err = 0;
771
772 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
773 skb_queue_empty(&iucv->backlog_skb_q) &&
774 skb_queue_empty(&sk->sk_receive_queue) &&
775 list_empty(&iucv->message_q.list))
776 return 0;
777
778 if (flags & (MSG_OOB))
779 return -EOPNOTSUPP;
780
781 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
782
783 skb = skb_recv_datagram(sk, flags, noblock, &err);
784 if (!skb) {
785 if (sk->sk_shutdown & RCV_SHUTDOWN)
786 return 0;
787 return err;
788 }
789
790 copied = min_t(unsigned int, skb->len, len);
791
792 cskb = skb;
793 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
794 skb_queue_head(&sk->sk_receive_queue, skb);
795 if (copied == 0)
796 return -EFAULT;
797 goto done;
798 }
799
800 len -= copied;
801
802 /* Mark read part of skb as used */
803 if (!(flags & MSG_PEEK)) {
804 skb_pull(skb, copied);
805
806 if (skb->len) {
807 skb_queue_head(&sk->sk_receive_queue, skb);
808 goto done;
809 }
810
811 kfree_skb(skb);
812
813 /* Queue backlog skbs */
814 rskb = skb_dequeue(&iucv->backlog_skb_q);
815 while (rskb) {
816 if (sock_queue_rcv_skb(sk, rskb)) {
817 skb_queue_head(&iucv->backlog_skb_q,
818 rskb);
819 break;
820 } else {
821 rskb = skb_dequeue(&iucv->backlog_skb_q);
822 }
823 }
824 if (skb_queue_empty(&iucv->backlog_skb_q)) {
825 spin_lock_bh(&iucv->message_q.lock);
826 if (!list_empty(&iucv->message_q.list))
827 iucv_process_message_q(sk);
828 spin_unlock_bh(&iucv->message_q.lock);
829 }
830
831 } else
832 skb_queue_head(&sk->sk_receive_queue, skb);
833
834 done:
835 return err ? : copied;
836 }
837
838 static inline unsigned int iucv_accept_poll(struct sock *parent)
839 {
840 struct iucv_sock *isk, *n;
841 struct sock *sk;
842
843 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
844 sk = (struct sock *) isk;
845
846 if (sk->sk_state == IUCV_CONNECTED)
847 return POLLIN | POLLRDNORM;
848 }
849
850 return 0;
851 }
852
853 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
854 poll_table *wait)
855 {
856 struct sock *sk = sock->sk;
857 unsigned int mask = 0;
858
859 poll_wait(file, sk->sk_sleep, wait);
860
861 if (sk->sk_state == IUCV_LISTEN)
862 return iucv_accept_poll(sk);
863
864 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
865 mask |= POLLERR;
866
867 if (sk->sk_shutdown & RCV_SHUTDOWN)
868 mask |= POLLRDHUP;
869
870 if (sk->sk_shutdown == SHUTDOWN_MASK)
871 mask |= POLLHUP;
872
873 if (!skb_queue_empty(&sk->sk_receive_queue) ||
874 (sk->sk_shutdown & RCV_SHUTDOWN))
875 mask |= POLLIN | POLLRDNORM;
876
877 if (sk->sk_state == IUCV_CLOSED)
878 mask |= POLLHUP;
879
880 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
881 mask |= POLLIN;
882
883 if (sock_writeable(sk))
884 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
885 else
886 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
887
888 return mask;
889 }
890
891 static int iucv_sock_shutdown(struct socket *sock, int how)
892 {
893 struct sock *sk = sock->sk;
894 struct iucv_sock *iucv = iucv_sk(sk);
895 struct iucv_message txmsg;
896 int err = 0;
897 u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
898
899 how++;
900
901 if ((how & ~SHUTDOWN_MASK) || !how)
902 return -EINVAL;
903
904 lock_sock(sk);
905 switch (sk->sk_state) {
906 case IUCV_CLOSED:
907 err = -ENOTCONN;
908 goto fail;
909
910 default:
911 sk->sk_shutdown |= how;
912 break;
913 }
914
915 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
916 txmsg.class = 0;
917 txmsg.tag = 0;
918 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
919 (void *) prmmsg, 8);
920 if (err) {
921 switch (err) {
922 case 1:
923 err = -ENOTCONN;
924 break;
925 case 2:
926 err = -ECONNRESET;
927 break;
928 default:
929 err = -ENOTCONN;
930 break;
931 }
932 }
933 }
934
935 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
936 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
937 if (err)
938 err = -ENOTCONN;
939
940 skb_queue_purge(&sk->sk_receive_queue);
941 }
942
943 /* Wake up anyone sleeping in poll */
944 sk->sk_state_change(sk);
945
946 fail:
947 release_sock(sk);
948 return err;
949 }
950
951 static int iucv_sock_release(struct socket *sock)
952 {
953 struct sock *sk = sock->sk;
954 int err = 0;
955
956 if (!sk)
957 return 0;
958
959 iucv_sock_close(sk);
960
961 /* Unregister with IUCV base support */
962 if (iucv_sk(sk)->path) {
963 iucv_path_sever(iucv_sk(sk)->path, NULL);
964 iucv_path_free(iucv_sk(sk)->path);
965 iucv_sk(sk)->path = NULL;
966 }
967
968 sock_orphan(sk);
969 iucv_sock_kill(sk);
970 return err;
971 }
972
973 /* Callback wrappers - called from iucv base support */
974 static int iucv_callback_connreq(struct iucv_path *path,
975 u8 ipvmid[8], u8 ipuser[16])
976 {
977 unsigned char user_data[16];
978 unsigned char nuser_data[16];
979 unsigned char src_name[8];
980 struct hlist_node *node;
981 struct sock *sk, *nsk;
982 struct iucv_sock *iucv, *niucv;
983 int err;
984
985 memcpy(src_name, ipuser, 8);
986 EBCASC(src_name, 8);
987 /* Find out if this path belongs to af_iucv. */
988 read_lock(&iucv_sk_list.lock);
989 iucv = NULL;
990 sk = NULL;
991 sk_for_each(sk, node, &iucv_sk_list.head)
992 if (sk->sk_state == IUCV_LISTEN &&
993 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
994 /*
995 * Found a listening socket with
996 * src_name == ipuser[0-7].
997 */
998 iucv = iucv_sk(sk);
999 break;
1000 }
1001 read_unlock(&iucv_sk_list.lock);
1002 if (!iucv)
1003 /* No socket found, not one of our paths. */
1004 return -EINVAL;
1005
1006 bh_lock_sock(sk);
1007
1008 /* Check if parent socket is listening */
1009 low_nmcpy(user_data, iucv->src_name);
1010 high_nmcpy(user_data, iucv->dst_name);
1011 ASCEBC(user_data, sizeof(user_data));
1012 if (sk->sk_state != IUCV_LISTEN) {
1013 err = iucv_path_sever(path, user_data);
1014 goto fail;
1015 }
1016
1017 /* Check for backlog size */
1018 if (sk_acceptq_is_full(sk)) {
1019 err = iucv_path_sever(path, user_data);
1020 goto fail;
1021 }
1022
1023 /* Create the new socket */
1024 nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
1025 if (!nsk) {
1026 err = iucv_path_sever(path, user_data);
1027 goto fail;
1028 }
1029
1030 niucv = iucv_sk(nsk);
1031 iucv_sock_init(nsk, sk);
1032
1033 /* Set the new iucv_sock */
1034 memcpy(niucv->dst_name, ipuser + 8, 8);
1035 EBCASC(niucv->dst_name, 8);
1036 memcpy(niucv->dst_user_id, ipvmid, 8);
1037 memcpy(niucv->src_name, iucv->src_name, 8);
1038 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1039 niucv->path = path;
1040
1041 /* Call iucv_accept */
1042 high_nmcpy(nuser_data, ipuser + 8);
1043 memcpy(nuser_data + 8, niucv->src_name, 8);
1044 ASCEBC(nuser_data + 8, 8);
1045
1046 path->msglim = IUCV_QUEUELEN_DEFAULT;
1047 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1048 if (err) {
1049 err = iucv_path_sever(path, user_data);
1050 goto fail;
1051 }
1052
1053 iucv_accept_enqueue(sk, nsk);
1054
1055 /* Wake up accept */
1056 nsk->sk_state = IUCV_CONNECTED;
1057 sk->sk_data_ready(sk, 1);
1058 err = 0;
1059 fail:
1060 bh_unlock_sock(sk);
1061 return 0;
1062 }
1063
1064 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1065 {
1066 struct sock *sk = path->private;
1067
1068 sk->sk_state = IUCV_CONNECTED;
1069 sk->sk_state_change(sk);
1070 }
1071
1072 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1073 {
1074 struct sock *sk = path->private;
1075 struct iucv_sock *iucv = iucv_sk(sk);
1076 struct sk_buff *skb;
1077 struct sock_msg_q *save_msg;
1078 int len;
1079
1080 if (sk->sk_shutdown & RCV_SHUTDOWN)
1081 return;
1082
1083 if (!list_empty(&iucv->message_q.list) ||
1084 !skb_queue_empty(&iucv->backlog_skb_q))
1085 goto save_message;
1086
1087 len = atomic_read(&sk->sk_rmem_alloc);
1088 len += msg->length + sizeof(struct sk_buff);
1089 if (len > sk->sk_rcvbuf)
1090 goto save_message;
1091
1092 skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
1093 if (!skb)
1094 goto save_message;
1095
1096 spin_lock(&iucv->message_q.lock);
1097 iucv_process_message(sk, skb, path, msg);
1098 spin_unlock(&iucv->message_q.lock);
1099
1100 return;
1101
1102 save_message:
1103 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1104 save_msg->path = path;
1105 save_msg->msg = *msg;
1106
1107 spin_lock(&iucv->message_q.lock);
1108 list_add_tail(&save_msg->list, &iucv->message_q.list);
1109 spin_unlock(&iucv->message_q.lock);
1110 }
1111
1112 static void iucv_callback_txdone(struct iucv_path *path,
1113 struct iucv_message *msg)
1114 {
1115 struct sock *sk = path->private;
1116 struct sk_buff *this;
1117 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1118 struct sk_buff *list_skb = list->next;
1119 unsigned long flags;
1120
1121 if (list_skb) {
1122 spin_lock_irqsave(&list->lock, flags);
1123
1124 do {
1125 this = list_skb;
1126 list_skb = list_skb->next;
1127 } while (memcmp(&msg->tag, this->cb, 4) && list_skb);
1128
1129 spin_unlock_irqrestore(&list->lock, flags);
1130
1131 skb_unlink(this, &iucv_sk(sk)->send_skb_q);
1132 kfree_skb(this);
1133 }
1134
1135 if (sk->sk_state == IUCV_CLOSING) {
1136 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1137 sk->sk_state = IUCV_CLOSED;
1138 sk->sk_state_change(sk);
1139 }
1140 }
1141
1142 }
1143
1144 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1145 {
1146 struct sock *sk = path->private;
1147
1148 if (!list_empty(&iucv_sk(sk)->accept_q))
1149 sk->sk_state = IUCV_SEVERED;
1150 else
1151 sk->sk_state = IUCV_DISCONN;
1152
1153 sk->sk_state_change(sk);
1154 }
1155
1156 static struct proto_ops iucv_sock_ops = {
1157 .family = PF_IUCV,
1158 .owner = THIS_MODULE,
1159 .release = iucv_sock_release,
1160 .bind = iucv_sock_bind,
1161 .connect = iucv_sock_connect,
1162 .listen = iucv_sock_listen,
1163 .accept = iucv_sock_accept,
1164 .getname = iucv_sock_getname,
1165 .sendmsg = iucv_sock_sendmsg,
1166 .recvmsg = iucv_sock_recvmsg,
1167 .poll = iucv_sock_poll,
1168 .ioctl = sock_no_ioctl,
1169 .mmap = sock_no_mmap,
1170 .socketpair = sock_no_socketpair,
1171 .shutdown = iucv_sock_shutdown,
1172 .setsockopt = sock_no_setsockopt,
1173 .getsockopt = sock_no_getsockopt
1174 };
1175
1176 static struct net_proto_family iucv_sock_family_ops = {
1177 .family = AF_IUCV,
1178 .owner = THIS_MODULE,
1179 .create = iucv_sock_create,
1180 };
1181
1182 static int __init afiucv_init(void)
1183 {
1184 int err;
1185
1186 if (!MACHINE_IS_VM) {
1187 printk(KERN_ERR "AF_IUCV connection needs VM as base\n");
1188 err = -EPROTONOSUPPORT;
1189 goto out;
1190 }
1191 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1192 if (unlikely(err)) {
1193 printk(KERN_ERR "AF_IUCV needs the VM userid\n");
1194 err = -EPROTONOSUPPORT;
1195 goto out;
1196 }
1197
1198 err = iucv_register(&af_iucv_handler, 0);
1199 if (err)
1200 goto out;
1201 err = proto_register(&iucv_proto, 0);
1202 if (err)
1203 goto out_iucv;
1204 err = sock_register(&iucv_sock_family_ops);
1205 if (err)
1206 goto out_proto;
1207 printk(KERN_INFO "AF_IUCV lowlevel driver initialized\n");
1208 return 0;
1209
1210 out_proto:
1211 proto_unregister(&iucv_proto);
1212 out_iucv:
1213 iucv_unregister(&af_iucv_handler, 0);
1214 out:
1215 return err;
1216 }
1217
1218 static void __exit afiucv_exit(void)
1219 {
1220 sock_unregister(PF_IUCV);
1221 proto_unregister(&iucv_proto);
1222 iucv_unregister(&af_iucv_handler, 0);
1223
1224 printk(KERN_INFO "AF_IUCV lowlevel driver unloaded\n");
1225 }
1226
1227 module_init(afiucv_init);
1228 module_exit(afiucv_exit);
1229
1230 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1231 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1232 MODULE_VERSION(VERSION);
1233 MODULE_LICENSE("GPL");
1234 MODULE_ALIAS_NETPROTO(PF_IUCV);
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