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mxcmmc : Reset the SDHC hardware if software timeout occurs.
[linux-2.6/mini2440.git] / net / iucv / af_iucv.c
blobb51c9187c3476652b2e4f1f01c4e7c52dc637e07
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 case IUCV_CLOSING: /* fall through */
176 sk->sk_state = IUCV_CLOSED;
177 sk->sk_state_change(sk);
178
179 if (iucv->path) {
180 low_nmcpy(user_data, iucv->src_name);
181 high_nmcpy(user_data, iucv->dst_name);
182 ASCEBC(user_data, sizeof(user_data));
183 err = iucv_path_sever(iucv->path, user_data);
184 iucv_path_free(iucv->path);
185 iucv->path = NULL;
186 }
187
188 sk->sk_err = ECONNRESET;
189 sk->sk_state_change(sk);
190
191 skb_queue_purge(&iucv->send_skb_q);
192 skb_queue_purge(&iucv->backlog_skb_q);
193
194 sock_set_flag(sk, SOCK_ZAPPED);
195 break;
196
197 default:
198 sock_set_flag(sk, SOCK_ZAPPED);
199 break;
200 }
201
202 release_sock(sk);
203 iucv_sock_kill(sk);
204 }
205
206 static void iucv_sock_init(struct sock *sk, struct sock *parent)
207 {
208 if (parent)
209 sk->sk_type = parent->sk_type;
210 }
211
212 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
213 {
214 struct sock *sk;
215
216 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
217 if (!sk)
218 return NULL;
219
220 sock_init_data(sock, sk);
221 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
222 spin_lock_init(&iucv_sk(sk)->accept_q_lock);
223 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
224 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
225 spin_lock_init(&iucv_sk(sk)->message_q.lock);
226 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
227 iucv_sk(sk)->send_tag = 0;
228 iucv_sk(sk)->path = NULL;
229 memset(&iucv_sk(sk)->src_user_id , 0, 32);
230
231 sk->sk_destruct = iucv_sock_destruct;
232 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
233 sk->sk_allocation = GFP_DMA;
234
235 sock_reset_flag(sk, SOCK_ZAPPED);
236
237 sk->sk_protocol = proto;
238 sk->sk_state = IUCV_OPEN;
239
240 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
241
242 iucv_sock_link(&iucv_sk_list, sk);
243 return sk;
244 }
245
246 /* Create an IUCV socket */
247 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
248 {
249 struct sock *sk;
250
251 if (sock->type != SOCK_STREAM)
252 return -ESOCKTNOSUPPORT;
253
254 sock->state = SS_UNCONNECTED;
255 sock->ops = &iucv_sock_ops;
256
257 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
258 if (!sk)
259 return -ENOMEM;
260
261 iucv_sock_init(sk, NULL);
262
263 return 0;
264 }
265
266 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
267 {
268 write_lock_bh(&l->lock);
269 sk_add_node(sk, &l->head);
270 write_unlock_bh(&l->lock);
271 }
272
273 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
274 {
275 write_lock_bh(&l->lock);
276 sk_del_node_init(sk);
277 write_unlock_bh(&l->lock);
278 }
279
280 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
281 {
282 unsigned long flags;
283 struct iucv_sock *par = iucv_sk(parent);
284
285 sock_hold(sk);
286 spin_lock_irqsave(&par->accept_q_lock, flags);
287 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
288 spin_unlock_irqrestore(&par->accept_q_lock, flags);
289 iucv_sk(sk)->parent = parent;
290 parent->sk_ack_backlog++;
291 }
292
293 void iucv_accept_unlink(struct sock *sk)
294 {
295 unsigned long flags;
296 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
297
298 spin_lock_irqsave(&par->accept_q_lock, flags);
299 list_del_init(&iucv_sk(sk)->accept_q);
300 spin_unlock_irqrestore(&par->accept_q_lock, flags);
301 iucv_sk(sk)->parent->sk_ack_backlog--;
302 iucv_sk(sk)->parent = NULL;
303 sock_put(sk);
304 }
305
306 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
307 {
308 struct iucv_sock *isk, *n;
309 struct sock *sk;
310
311 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
312 sk = (struct sock *) isk;
313 lock_sock(sk);
314
315 if (sk->sk_state == IUCV_CLOSED) {
316 iucv_accept_unlink(sk);
317 release_sock(sk);
318 continue;
319 }
320
321 if (sk->sk_state == IUCV_CONNECTED ||
322 sk->sk_state == IUCV_SEVERED ||
323 !newsock) {
324 iucv_accept_unlink(sk);
325 if (newsock)
326 sock_graft(sk, newsock);
327
328 if (sk->sk_state == IUCV_SEVERED)
329 sk->sk_state = IUCV_DISCONN;
330
331 release_sock(sk);
332 return sk;
333 }
334
335 release_sock(sk);
336 }
337 return NULL;
338 }
339
340 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
341 unsigned long timeo)
342 {
343 DECLARE_WAITQUEUE(wait, current);
344 int err = 0;
345
346 add_wait_queue(sk->sk_sleep, &wait);
347 while (sk->sk_state != state && sk->sk_state != state2) {
348 set_current_state(TASK_INTERRUPTIBLE);
349
350 if (!timeo) {
351 err = -EAGAIN;
352 break;
353 }
354
355 if (signal_pending(current)) {
356 err = sock_intr_errno(timeo);
357 break;
358 }
359
360 release_sock(sk);
361 timeo = schedule_timeout(timeo);
362 lock_sock(sk);
363
364 err = sock_error(sk);
365 if (err)
366 break;
367 }
368 set_current_state(TASK_RUNNING);
369 remove_wait_queue(sk->sk_sleep, &wait);
370 return err;
371 }
372
373 /* Bind an unbound socket */
374 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
375 int addr_len)
376 {
377 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
378 struct sock *sk = sock->sk;
379 struct iucv_sock *iucv;
380 int err;
381
382 /* Verify the input sockaddr */
383 if (!addr || addr->sa_family != AF_IUCV)
384 return -EINVAL;
385
386 lock_sock(sk);
387 if (sk->sk_state != IUCV_OPEN) {
388 err = -EBADFD;
389 goto done;
390 }
391
392 write_lock_bh(&iucv_sk_list.lock);
393
394 iucv = iucv_sk(sk);
395 if (__iucv_get_sock_by_name(sa->siucv_name)) {
396 err = -EADDRINUSE;
397 goto done_unlock;
398 }
399 if (iucv->path) {
400 err = 0;
401 goto done_unlock;
402 }
403
404 /* Bind the socket */
405 memcpy(iucv->src_name, sa->siucv_name, 8);
406
407 /* Copy the user id */
408 memcpy(iucv->src_user_id, iucv_userid, 8);
409 sk->sk_state = IUCV_BOUND;
410 err = 0;
411
412 done_unlock:
413 /* Release the socket list lock */
414 write_unlock_bh(&iucv_sk_list.lock);
415 done:
416 release_sock(sk);
417 return err;
418 }
419
420 /* Automatically bind an unbound socket */
421 static int iucv_sock_autobind(struct sock *sk)
422 {
423 struct iucv_sock *iucv = iucv_sk(sk);
424 char query_buffer[80];
425 char name[12];
426 int err = 0;
427
428 /* Set the userid and name */
429 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
430 if (unlikely(err))
431 return -EPROTO;
432
433 memcpy(iucv->src_user_id, query_buffer, 8);
434
435 write_lock_bh(&iucv_sk_list.lock);
436
437 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
438 while (__iucv_get_sock_by_name(name)) {
439 sprintf(name, "%08x",
440 atomic_inc_return(&iucv_sk_list.autobind_name));
441 }
442
443 write_unlock_bh(&iucv_sk_list.lock);
444
445 memcpy(&iucv->src_name, name, 8);
446
447 return err;
448 }
449
450 /* Connect an unconnected socket */
451 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
452 int alen, int flags)
453 {
454 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
455 struct sock *sk = sock->sk;
456 struct iucv_sock *iucv;
457 unsigned char user_data[16];
458 int err;
459
460 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
461 return -EINVAL;
462
463 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
464 return -EBADFD;
465
466 if (sk->sk_type != SOCK_STREAM)
467 return -EINVAL;
468
469 iucv = iucv_sk(sk);
470
471 if (sk->sk_state == IUCV_OPEN) {
472 err = iucv_sock_autobind(sk);
473 if (unlikely(err))
474 return err;
475 }
476
477 lock_sock(sk);
478
479 /* Set the destination information */
480 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
481 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
482
483 high_nmcpy(user_data, sa->siucv_name);
484 low_nmcpy(user_data, iucv_sk(sk)->src_name);
485 ASCEBC(user_data, sizeof(user_data));
486
487 iucv = iucv_sk(sk);
488 /* Create path. */
489 iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
490 IPRMDATA, GFP_KERNEL);
491 if (!iucv->path) {
492 err = -ENOMEM;
493 goto done;
494 }
495 err = iucv_path_connect(iucv->path, &af_iucv_handler,
496 sa->siucv_user_id, NULL, user_data, sk);
497 if (err) {
498 iucv_path_free(iucv->path);
499 iucv->path = NULL;
500 switch (err) {
501 case 0x0b: /* Target communicator is not logged on */
502 err = -ENETUNREACH;
503 break;
504 case 0x0d: /* Max connections for this guest exceeded */
505 case 0x0e: /* Max connections for target guest exceeded */
506 err = -EAGAIN;
507 break;
508 case 0x0f: /* Missing IUCV authorization */
509 err = -EACCES;
510 break;
511 default:
512 err = -ECONNREFUSED;
513 break;
514 }
515 goto done;
516 }
517
518 if (sk->sk_state != IUCV_CONNECTED) {
519 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
520 sock_sndtimeo(sk, flags & O_NONBLOCK));
521 }
522
523 if (sk->sk_state == IUCV_DISCONN) {
524 release_sock(sk);
525 return -ECONNREFUSED;
526 }
527
528 if (err) {
529 iucv_path_sever(iucv->path, NULL);
530 iucv_path_free(iucv->path);
531 iucv->path = NULL;
532 }
533
534 done:
535 release_sock(sk);
536 return err;
537 }
538
539 /* Move a socket into listening state. */
540 static int iucv_sock_listen(struct socket *sock, int backlog)
541 {
542 struct sock *sk = sock->sk;
543 int err;
544
545 lock_sock(sk);
546
547 err = -EINVAL;
548 if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
549 goto done;
550
551 sk->sk_max_ack_backlog = backlog;
552 sk->sk_ack_backlog = 0;
553 sk->sk_state = IUCV_LISTEN;
554 err = 0;
555
556 done:
557 release_sock(sk);
558 return err;
559 }
560
561 /* Accept a pending connection */
562 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
563 int flags)
564 {
565 DECLARE_WAITQUEUE(wait, current);
566 struct sock *sk = sock->sk, *nsk;
567 long timeo;
568 int err = 0;
569
570 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
571
572 if (sk->sk_state != IUCV_LISTEN) {
573 err = -EBADFD;
574 goto done;
575 }
576
577 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
578
579 /* Wait for an incoming connection */
580 add_wait_queue_exclusive(sk->sk_sleep, &wait);
581 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
582 set_current_state(TASK_INTERRUPTIBLE);
583 if (!timeo) {
584 err = -EAGAIN;
585 break;
586 }
587
588 release_sock(sk);
589 timeo = schedule_timeout(timeo);
590 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
591
592 if (sk->sk_state != IUCV_LISTEN) {
593 err = -EBADFD;
594 break;
595 }
596
597 if (signal_pending(current)) {
598 err = sock_intr_errno(timeo);
599 break;
600 }
601 }
602
603 set_current_state(TASK_RUNNING);
604 remove_wait_queue(sk->sk_sleep, &wait);
605
606 if (err)
607 goto done;
608
609 newsock->state = SS_CONNECTED;
610
611 done:
612 release_sock(sk);
613 return err;
614 }
615
616 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
617 int *len, int peer)
618 {
619 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
620 struct sock *sk = sock->sk;
621
622 addr->sa_family = AF_IUCV;
623 *len = sizeof(struct sockaddr_iucv);
624
625 if (peer) {
626 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
627 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
628 } else {
629 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
630 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
631 }
632 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
633 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
634 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
635
636 return 0;
637 }
638
639 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
640 struct msghdr *msg, size_t len)
641 {
642 struct sock *sk = sock->sk;
643 struct iucv_sock *iucv = iucv_sk(sk);
644 struct sk_buff *skb;
645 struct iucv_message txmsg;
646 char user_id[9];
647 char appl_id[9];
648 int err;
649
650 err = sock_error(sk);
651 if (err)
652 return err;
653
654 if (msg->msg_flags & MSG_OOB)
655 return -EOPNOTSUPP;
656
657 lock_sock(sk);
658
659 if (sk->sk_shutdown & SEND_SHUTDOWN) {
660 err = -EPIPE;
661 goto out;
662 }
663
664 if (sk->sk_state == IUCV_CONNECTED) {
665 if (!(skb = sock_alloc_send_skb(sk, len,
666 msg->msg_flags & MSG_DONTWAIT,
667 &err)))
668 goto out;
669
670 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
671 err = -EFAULT;
672 goto fail;
673 }
674
675 txmsg.class = 0;
676 memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len);
677 txmsg.tag = iucv->send_tag++;
678 memcpy(skb->cb, &txmsg.tag, 4);
679 skb_queue_tail(&iucv->send_skb_q, skb);
680 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
681 (void *) skb->data, skb->len);
682 if (err) {
683 if (err == 3) {
684 user_id[8] = 0;
685 memcpy(user_id, iucv->dst_user_id, 8);
686 appl_id[8] = 0;
687 memcpy(appl_id, iucv->dst_name, 8);
688 pr_err("Application %s on z/VM guest %s"
689 " exceeds message limit\n",
690 user_id, appl_id);
691 }
692 skb_unlink(skb, &iucv->send_skb_q);
693 err = -EPIPE;
694 goto fail;
695 }
696
697 } else {
698 err = -ENOTCONN;
699 goto out;
700 }
701
702 release_sock(sk);
703 return len;
704
705 fail:
706 kfree_skb(skb);
707 out:
708 release_sock(sk);
709 return err;
710 }
711
712 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
713 {
714 int dataleft, size, copied = 0;
715 struct sk_buff *nskb;
716
717 dataleft = len;
718 while (dataleft) {
719 if (dataleft >= sk->sk_rcvbuf / 4)
720 size = sk->sk_rcvbuf / 4;
721 else
722 size = dataleft;
723
724 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
725 if (!nskb)
726 return -ENOMEM;
727
728 memcpy(nskb->data, skb->data + copied, size);
729 copied += size;
730 dataleft -= size;
731
732 skb_reset_transport_header(nskb);
733 skb_reset_network_header(nskb);
734 nskb->len = size;
735
736 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
737 }
738
739 return 0;
740 }
741
742 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
743 struct iucv_path *path,
744 struct iucv_message *msg)
745 {
746 int rc;
747
748 if (msg->flags & IPRMDATA) {
749 skb->data = NULL;
750 skb->len = 0;
751 } else {
752 rc = iucv_message_receive(path, msg, 0, skb->data,
753 msg->length, NULL);
754 if (rc) {
755 kfree_skb(skb);
756 return;
757 }
758 if (skb->truesize >= sk->sk_rcvbuf / 4) {
759 rc = iucv_fragment_skb(sk, skb, msg->length);
760 kfree_skb(skb);
761 skb = NULL;
762 if (rc) {
763 iucv_path_sever(path, NULL);
764 return;
765 }
766 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
767 } else {
768 skb_reset_transport_header(skb);
769 skb_reset_network_header(skb);
770 skb->len = msg->length;
771 }
772 }
773
774 if (sock_queue_rcv_skb(sk, skb))
775 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
776 }
777
778 static void iucv_process_message_q(struct sock *sk)
779 {
780 struct iucv_sock *iucv = iucv_sk(sk);
781 struct sk_buff *skb;
782 struct sock_msg_q *p, *n;
783
784 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
785 skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
786 if (!skb)
787 break;
788 iucv_process_message(sk, skb, p->path, &p->msg);
789 list_del(&p->list);
790 kfree(p);
791 if (!skb_queue_empty(&iucv->backlog_skb_q))
792 break;
793 }
794 }
795
796 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
797 struct msghdr *msg, size_t len, int flags)
798 {
799 int noblock = flags & MSG_DONTWAIT;
800 struct sock *sk = sock->sk;
801 struct iucv_sock *iucv = iucv_sk(sk);
802 int target, copied = 0;
803 struct sk_buff *skb, *rskb, *cskb;
804 int err = 0;
805
806 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
807 skb_queue_empty(&iucv->backlog_skb_q) &&
808 skb_queue_empty(&sk->sk_receive_queue) &&
809 list_empty(&iucv->message_q.list))
810 return 0;
811
812 if (flags & (MSG_OOB))
813 return -EOPNOTSUPP;
814
815 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
816
817 /* receive/dequeue next skb:
818 * the function understands MSG_PEEK and, thus, does not dequeue skb */
819 skb = skb_recv_datagram(sk, flags, noblock, &err);
820 if (!skb) {
821 if (sk->sk_shutdown & RCV_SHUTDOWN)
822 return 0;
823 return err;
824 }
825
826 copied = min_t(unsigned int, skb->len, len);
827
828 cskb = skb;
829 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
830 skb_queue_head(&sk->sk_receive_queue, skb);
831 if (copied == 0)
832 return -EFAULT;
833 goto done;
834 }
835
836 len -= copied;
837
838 /* Mark read part of skb as used */
839 if (!(flags & MSG_PEEK)) {
840 skb_pull(skb, copied);
841
842 if (skb->len) {
843 skb_queue_head(&sk->sk_receive_queue, skb);
844 goto done;
845 }
846
847 kfree_skb(skb);
848
849 /* Queue backlog skbs */
850 rskb = skb_dequeue(&iucv->backlog_skb_q);
851 while (rskb) {
852 if (sock_queue_rcv_skb(sk, rskb)) {
853 skb_queue_head(&iucv->backlog_skb_q,
854 rskb);
855 break;
856 } else {
857 rskb = skb_dequeue(&iucv->backlog_skb_q);
858 }
859 }
860 if (skb_queue_empty(&iucv->backlog_skb_q)) {
861 spin_lock_bh(&iucv->message_q.lock);
862 if (!list_empty(&iucv->message_q.list))
863 iucv_process_message_q(sk);
864 spin_unlock_bh(&iucv->message_q.lock);
865 }
866 }
867
868 done:
869 return err ? : copied;
870 }
871
872 static inline unsigned int iucv_accept_poll(struct sock *parent)
873 {
874 struct iucv_sock *isk, *n;
875 struct sock *sk;
876
877 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
878 sk = (struct sock *) isk;
879
880 if (sk->sk_state == IUCV_CONNECTED)
881 return POLLIN | POLLRDNORM;
882 }
883
884 return 0;
885 }
886
887 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
888 poll_table *wait)
889 {
890 struct sock *sk = sock->sk;
891 unsigned int mask = 0;
892
893 poll_wait(file, sk->sk_sleep, wait);
894
895 if (sk->sk_state == IUCV_LISTEN)
896 return iucv_accept_poll(sk);
897
898 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
899 mask |= POLLERR;
900
901 if (sk->sk_shutdown & RCV_SHUTDOWN)
902 mask |= POLLRDHUP;
903
904 if (sk->sk_shutdown == SHUTDOWN_MASK)
905 mask |= POLLHUP;
906
907 if (!skb_queue_empty(&sk->sk_receive_queue) ||
908 (sk->sk_shutdown & RCV_SHUTDOWN))
909 mask |= POLLIN | POLLRDNORM;
910
911 if (sk->sk_state == IUCV_CLOSED)
912 mask |= POLLHUP;
913
914 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
915 mask |= POLLIN;
916
917 if (sock_writeable(sk))
918 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
919 else
920 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
921
922 return mask;
923 }
924
925 static int iucv_sock_shutdown(struct socket *sock, int how)
926 {
927 struct sock *sk = sock->sk;
928 struct iucv_sock *iucv = iucv_sk(sk);
929 struct iucv_message txmsg;
930 int err = 0;
931 u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
932
933 how++;
934
935 if ((how & ~SHUTDOWN_MASK) || !how)
936 return -EINVAL;
937
938 lock_sock(sk);
939 switch (sk->sk_state) {
940 case IUCV_DISCONN:
941 case IUCV_CLOSING:
942 case IUCV_SEVERED:
943 case IUCV_CLOSED:
944 err = -ENOTCONN;
945 goto fail;
946
947 default:
948 sk->sk_shutdown |= how;
949 break;
950 }
951
952 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
953 txmsg.class = 0;
954 txmsg.tag = 0;
955 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
956 (void *) prmmsg, 8);
957 if (err) {
958 switch (err) {
959 case 1:
960 err = -ENOTCONN;
961 break;
962 case 2:
963 err = -ECONNRESET;
964 break;
965 default:
966 err = -ENOTCONN;
967 break;
968 }
969 }
970 }
971
972 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
973 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
974 if (err)
975 err = -ENOTCONN;
976
977 skb_queue_purge(&sk->sk_receive_queue);
978 }
979
980 /* Wake up anyone sleeping in poll */
981 sk->sk_state_change(sk);
982
983 fail:
984 release_sock(sk);
985 return err;
986 }
987
988 static int iucv_sock_release(struct socket *sock)
989 {
990 struct sock *sk = sock->sk;
991 int err = 0;
992
993 if (!sk)
994 return 0;
995
996 iucv_sock_close(sk);
997
998 /* Unregister with IUCV base support */
999 if (iucv_sk(sk)->path) {
1000 iucv_path_sever(iucv_sk(sk)->path, NULL);
1001 iucv_path_free(iucv_sk(sk)->path);
1002 iucv_sk(sk)->path = NULL;
1003 }
1004
1005 sock_orphan(sk);
1006 iucv_sock_kill(sk);
1007 return err;
1008 }
1009
1010 /* Callback wrappers - called from iucv base support */
1011 static int iucv_callback_connreq(struct iucv_path *path,
1012 u8 ipvmid[8], u8 ipuser[16])
1013 {
1014 unsigned char user_data[16];
1015 unsigned char nuser_data[16];
1016 unsigned char src_name[8];
1017 struct hlist_node *node;
1018 struct sock *sk, *nsk;
1019 struct iucv_sock *iucv, *niucv;
1020 int err;
1021
1022 memcpy(src_name, ipuser, 8);
1023 EBCASC(src_name, 8);
1024 /* Find out if this path belongs to af_iucv. */
1025 read_lock(&iucv_sk_list.lock);
1026 iucv = NULL;
1027 sk = NULL;
1028 sk_for_each(sk, node, &iucv_sk_list.head)
1029 if (sk->sk_state == IUCV_LISTEN &&
1030 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1031 /*
1032 * Found a listening socket with
1033 * src_name == ipuser[0-7].
1034 */
1035 iucv = iucv_sk(sk);
1036 break;
1037 }
1038 read_unlock(&iucv_sk_list.lock);
1039 if (!iucv)
1040 /* No socket found, not one of our paths. */
1041 return -EINVAL;
1042
1043 bh_lock_sock(sk);
1044
1045 /* Check if parent socket is listening */
1046 low_nmcpy(user_data, iucv->src_name);
1047 high_nmcpy(user_data, iucv->dst_name);
1048 ASCEBC(user_data, sizeof(user_data));
1049 if (sk->sk_state != IUCV_LISTEN) {
1050 err = iucv_path_sever(path, user_data);
1051 iucv_path_free(path);
1052 goto fail;
1053 }
1054
1055 /* Check for backlog size */
1056 if (sk_acceptq_is_full(sk)) {
1057 err = iucv_path_sever(path, user_data);
1058 iucv_path_free(path);
1059 goto fail;
1060 }
1061
1062 /* Create the new socket */
1063 nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
1064 if (!nsk) {
1065 err = iucv_path_sever(path, user_data);
1066 iucv_path_free(path);
1067 goto fail;
1068 }
1069
1070 niucv = iucv_sk(nsk);
1071 iucv_sock_init(nsk, sk);
1072
1073 /* Set the new iucv_sock */
1074 memcpy(niucv->dst_name, ipuser + 8, 8);
1075 EBCASC(niucv->dst_name, 8);
1076 memcpy(niucv->dst_user_id, ipvmid, 8);
1077 memcpy(niucv->src_name, iucv->src_name, 8);
1078 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1079 niucv->path = path;
1080
1081 /* Call iucv_accept */
1082 high_nmcpy(nuser_data, ipuser + 8);
1083 memcpy(nuser_data + 8, niucv->src_name, 8);
1084 ASCEBC(nuser_data + 8, 8);
1085
1086 path->msglim = IUCV_QUEUELEN_DEFAULT;
1087 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1088 if (err) {
1089 err = iucv_path_sever(path, user_data);
1090 iucv_path_free(path);
1091 iucv_sock_kill(nsk);
1092 goto fail;
1093 }
1094
1095 iucv_accept_enqueue(sk, nsk);
1096
1097 /* Wake up accept */
1098 nsk->sk_state = IUCV_CONNECTED;
1099 sk->sk_data_ready(sk, 1);
1100 err = 0;
1101 fail:
1102 bh_unlock_sock(sk);
1103 return 0;
1104 }
1105
1106 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1107 {
1108 struct sock *sk = path->private;
1109
1110 sk->sk_state = IUCV_CONNECTED;
1111 sk->sk_state_change(sk);
1112 }
1113
1114 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1115 {
1116 struct sock *sk = path->private;
1117 struct iucv_sock *iucv = iucv_sk(sk);
1118 struct sk_buff *skb;
1119 struct sock_msg_q *save_msg;
1120 int len;
1121
1122 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1123 iucv_message_reject(path, msg);
1124 return;
1125 }
1126
1127 spin_lock(&iucv->message_q.lock);
1128
1129 if (!list_empty(&iucv->message_q.list) ||
1130 !skb_queue_empty(&iucv->backlog_skb_q))
1131 goto save_message;
1132
1133 len = atomic_read(&sk->sk_rmem_alloc);
1134 len += msg->length + sizeof(struct sk_buff);
1135 if (len > sk->sk_rcvbuf)
1136 goto save_message;
1137
1138 skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
1139 if (!skb)
1140 goto save_message;
1141
1142 iucv_process_message(sk, skb, path, msg);
1143 goto out_unlock;
1144
1145 return;
1146
1147 save_message:
1148 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1149 if (!save_msg)
1150 return;
1151 save_msg->path = path;
1152 save_msg->msg = *msg;
1153
1154 list_add_tail(&save_msg->list, &iucv->message_q.list);
1155
1156 out_unlock:
1157 spin_unlock(&iucv->message_q.lock);
1158 }
1159
1160 static void iucv_callback_txdone(struct iucv_path *path,
1161 struct iucv_message *msg)
1162 {
1163 struct sock *sk = path->private;
1164 struct sk_buff *this = NULL;
1165 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1166 struct sk_buff *list_skb = list->next;
1167 unsigned long flags;
1168
1169 if (!skb_queue_empty(list)) {
1170 spin_lock_irqsave(&list->lock, flags);
1171
1172 while (list_skb != (struct sk_buff *)list) {
1173 if (!memcmp(&msg->tag, list_skb->cb, 4)) {
1174 this = list_skb;
1175 break;
1176 }
1177 list_skb = list_skb->next;
1178 }
1179 if (this)
1180 __skb_unlink(this, list);
1181
1182 spin_unlock_irqrestore(&list->lock, flags);
1183
1184 kfree_skb(this);
1185 }
1186 BUG_ON(!this);
1187
1188 if (sk->sk_state == IUCV_CLOSING) {
1189 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1190 sk->sk_state = IUCV_CLOSED;
1191 sk->sk_state_change(sk);
1192 }
1193 }
1194
1195 }
1196
1197 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1198 {
1199 struct sock *sk = path->private;
1200
1201 if (!list_empty(&iucv_sk(sk)->accept_q))
1202 sk->sk_state = IUCV_SEVERED;
1203 else
1204 sk->sk_state = IUCV_DISCONN;
1205
1206 sk->sk_state_change(sk);
1207 }
1208
1209 static struct proto_ops iucv_sock_ops = {
1210 .family = PF_IUCV,
1211 .owner = THIS_MODULE,
1212 .release = iucv_sock_release,
1213 .bind = iucv_sock_bind,
1214 .connect = iucv_sock_connect,
1215 .listen = iucv_sock_listen,
1216 .accept = iucv_sock_accept,
1217 .getname = iucv_sock_getname,
1218 .sendmsg = iucv_sock_sendmsg,
1219 .recvmsg = iucv_sock_recvmsg,
1220 .poll = iucv_sock_poll,
1221 .ioctl = sock_no_ioctl,
1222 .mmap = sock_no_mmap,
1223 .socketpair = sock_no_socketpair,
1224 .shutdown = iucv_sock_shutdown,
1225 .setsockopt = sock_no_setsockopt,
1226 .getsockopt = sock_no_getsockopt
1227 };
1228
1229 static struct net_proto_family iucv_sock_family_ops = {
1230 .family = AF_IUCV,
1231 .owner = THIS_MODULE,
1232 .create = iucv_sock_create,
1233 };
1234
1235 static int __init afiucv_init(void)
1236 {
1237 int err;
1238
1239 if (!MACHINE_IS_VM) {
1240 pr_err("The af_iucv module cannot be loaded"
1241 " without z/VM\n");
1242 err = -EPROTONOSUPPORT;
1243 goto out;
1244 }
1245 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1246 if (unlikely(err)) {
1247 WARN_ON(err);
1248 err = -EPROTONOSUPPORT;
1249 goto out;
1250 }
1251
1252 err = iucv_register(&af_iucv_handler, 0);
1253 if (err)
1254 goto out;
1255 err = proto_register(&iucv_proto, 0);
1256 if (err)
1257 goto out_iucv;
1258 err = sock_register(&iucv_sock_family_ops);
1259 if (err)
1260 goto out_proto;
1261 return 0;
1262
1263 out_proto:
1264 proto_unregister(&iucv_proto);
1265 out_iucv:
1266 iucv_unregister(&af_iucv_handler, 0);
1267 out:
1268 return err;
1269 }
1270
1271 static void __exit afiucv_exit(void)
1272 {
1273 sock_unregister(PF_IUCV);
1274 proto_unregister(&iucv_proto);
1275 iucv_unregister(&af_iucv_handler, 0);
1276 }
1277
1278 module_init(afiucv_init);
1279 module_exit(afiucv_exit);
1280
1281 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1282 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1283 MODULE_VERSION(VERSION);
1284 MODULE_LICENSE("GPL");
1285 MODULE_ALIAS_NETPROTO(PF_IUCV);
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