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af_iucv: New error return codes for connect()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / iucv / af_iucv.c
blob1077bc4e6e2a1f90076ff59a3943935477631d12
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 done:
525 release_sock(sk);
526 return err;
527 }
528
529 /* Move a socket into listening state. */
530 static int iucv_sock_listen(struct socket *sock, int backlog)
531 {
532 struct sock *sk = sock->sk;
533 int err;
534
535 lock_sock(sk);
536
537 err = -EINVAL;
538 if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
539 goto done;
540
541 sk->sk_max_ack_backlog = backlog;
542 sk->sk_ack_backlog = 0;
543 sk->sk_state = IUCV_LISTEN;
544 err = 0;
545
546 done:
547 release_sock(sk);
548 return err;
549 }
550
551 /* Accept a pending connection */
552 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
553 int flags)
554 {
555 DECLARE_WAITQUEUE(wait, current);
556 struct sock *sk = sock->sk, *nsk;
557 long timeo;
558 int err = 0;
559
560 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
561
562 if (sk->sk_state != IUCV_LISTEN) {
563 err = -EBADFD;
564 goto done;
565 }
566
567 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
568
569 /* Wait for an incoming connection */
570 add_wait_queue_exclusive(sk->sk_sleep, &wait);
571 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
572 set_current_state(TASK_INTERRUPTIBLE);
573 if (!timeo) {
574 err = -EAGAIN;
575 break;
576 }
577
578 release_sock(sk);
579 timeo = schedule_timeout(timeo);
580 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
581
582 if (sk->sk_state != IUCV_LISTEN) {
583 err = -EBADFD;
584 break;
585 }
586
587 if (signal_pending(current)) {
588 err = sock_intr_errno(timeo);
589 break;
590 }
591 }
592
593 set_current_state(TASK_RUNNING);
594 remove_wait_queue(sk->sk_sleep, &wait);
595
596 if (err)
597 goto done;
598
599 newsock->state = SS_CONNECTED;
600
601 done:
602 release_sock(sk);
603 return err;
604 }
605
606 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
607 int *len, int peer)
608 {
609 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
610 struct sock *sk = sock->sk;
611
612 addr->sa_family = AF_IUCV;
613 *len = sizeof(struct sockaddr_iucv);
614
615 if (peer) {
616 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
617 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
618 } else {
619 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
620 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
621 }
622 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
623 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
624 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
625
626 return 0;
627 }
628
629 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
630 struct msghdr *msg, size_t len)
631 {
632 struct sock *sk = sock->sk;
633 struct iucv_sock *iucv = iucv_sk(sk);
634 struct sk_buff *skb;
635 struct iucv_message txmsg;
636 char user_id[9];
637 char appl_id[9];
638 int err;
639
640 err = sock_error(sk);
641 if (err)
642 return err;
643
644 if (msg->msg_flags & MSG_OOB)
645 return -EOPNOTSUPP;
646
647 lock_sock(sk);
648
649 if (sk->sk_shutdown & SEND_SHUTDOWN) {
650 err = -EPIPE;
651 goto out;
652 }
653
654 if (sk->sk_state == IUCV_CONNECTED) {
655 if (!(skb = sock_alloc_send_skb(sk, len,
656 msg->msg_flags & MSG_DONTWAIT,
657 &err)))
658 goto out;
659
660 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
661 err = -EFAULT;
662 goto fail;
663 }
664
665 txmsg.class = 0;
666 memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len);
667 txmsg.tag = iucv->send_tag++;
668 memcpy(skb->cb, &txmsg.tag, 4);
669 skb_queue_tail(&iucv->send_skb_q, skb);
670 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
671 (void *) skb->data, skb->len);
672 if (err) {
673 if (err == 3) {
674 user_id[8] = 0;
675 memcpy(user_id, iucv->dst_user_id, 8);
676 appl_id[8] = 0;
677 memcpy(appl_id, iucv->dst_name, 8);
678 pr_err("Application %s on z/VM guest %s"
679 " exceeds message limit\n",
680 user_id, appl_id);
681 }
682 skb_unlink(skb, &iucv->send_skb_q);
683 err = -EPIPE;
684 goto fail;
685 }
686
687 } else {
688 err = -ENOTCONN;
689 goto out;
690 }
691
692 release_sock(sk);
693 return len;
694
695 fail:
696 kfree_skb(skb);
697 out:
698 release_sock(sk);
699 return err;
700 }
701
702 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
703 {
704 int dataleft, size, copied = 0;
705 struct sk_buff *nskb;
706
707 dataleft = len;
708 while (dataleft) {
709 if (dataleft >= sk->sk_rcvbuf / 4)
710 size = sk->sk_rcvbuf / 4;
711 else
712 size = dataleft;
713
714 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
715 if (!nskb)
716 return -ENOMEM;
717
718 memcpy(nskb->data, skb->data + copied, size);
719 copied += size;
720 dataleft -= size;
721
722 skb_reset_transport_header(nskb);
723 skb_reset_network_header(nskb);
724 nskb->len = size;
725
726 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
727 }
728
729 return 0;
730 }
731
732 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
733 struct iucv_path *path,
734 struct iucv_message *msg)
735 {
736 int rc;
737
738 if (msg->flags & IPRMDATA) {
739 skb->data = NULL;
740 skb->len = 0;
741 } else {
742 rc = iucv_message_receive(path, msg, 0, skb->data,
743 msg->length, NULL);
744 if (rc) {
745 kfree_skb(skb);
746 return;
747 }
748 if (skb->truesize >= sk->sk_rcvbuf / 4) {
749 rc = iucv_fragment_skb(sk, skb, msg->length);
750 kfree_skb(skb);
751 skb = NULL;
752 if (rc) {
753 iucv_path_sever(path, NULL);
754 return;
755 }
756 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
757 } else {
758 skb_reset_transport_header(skb);
759 skb_reset_network_header(skb);
760 skb->len = msg->length;
761 }
762 }
763
764 if (sock_queue_rcv_skb(sk, skb))
765 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
766 }
767
768 static void iucv_process_message_q(struct sock *sk)
769 {
770 struct iucv_sock *iucv = iucv_sk(sk);
771 struct sk_buff *skb;
772 struct sock_msg_q *p, *n;
773
774 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
775 skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
776 if (!skb)
777 break;
778 iucv_process_message(sk, skb, p->path, &p->msg);
779 list_del(&p->list);
780 kfree(p);
781 if (!skb_queue_empty(&iucv->backlog_skb_q))
782 break;
783 }
784 }
785
786 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
787 struct msghdr *msg, size_t len, int flags)
788 {
789 int noblock = flags & MSG_DONTWAIT;
790 struct sock *sk = sock->sk;
791 struct iucv_sock *iucv = iucv_sk(sk);
792 int target, copied = 0;
793 struct sk_buff *skb, *rskb, *cskb;
794 int err = 0;
795
796 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
797 skb_queue_empty(&iucv->backlog_skb_q) &&
798 skb_queue_empty(&sk->sk_receive_queue) &&
799 list_empty(&iucv->message_q.list))
800 return 0;
801
802 if (flags & (MSG_OOB))
803 return -EOPNOTSUPP;
804
805 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
806
807 skb = skb_recv_datagram(sk, flags, noblock, &err);
808 if (!skb) {
809 if (sk->sk_shutdown & RCV_SHUTDOWN)
810 return 0;
811 return err;
812 }
813
814 copied = min_t(unsigned int, skb->len, len);
815
816 cskb = skb;
817 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
818 skb_queue_head(&sk->sk_receive_queue, skb);
819 if (copied == 0)
820 return -EFAULT;
821 goto done;
822 }
823
824 len -= copied;
825
826 /* Mark read part of skb as used */
827 if (!(flags & MSG_PEEK)) {
828 skb_pull(skb, copied);
829
830 if (skb->len) {
831 skb_queue_head(&sk->sk_receive_queue, skb);
832 goto done;
833 }
834
835 kfree_skb(skb);
836
837 /* Queue backlog skbs */
838 rskb = skb_dequeue(&iucv->backlog_skb_q);
839 while (rskb) {
840 if (sock_queue_rcv_skb(sk, rskb)) {
841 skb_queue_head(&iucv->backlog_skb_q,
842 rskb);
843 break;
844 } else {
845 rskb = skb_dequeue(&iucv->backlog_skb_q);
846 }
847 }
848 if (skb_queue_empty(&iucv->backlog_skb_q)) {
849 spin_lock_bh(&iucv->message_q.lock);
850 if (!list_empty(&iucv->message_q.list))
851 iucv_process_message_q(sk);
852 spin_unlock_bh(&iucv->message_q.lock);
853 }
854
855 } else
856 skb_queue_head(&sk->sk_receive_queue, skb);
857
858 done:
859 return err ? : copied;
860 }
861
862 static inline unsigned int iucv_accept_poll(struct sock *parent)
863 {
864 struct iucv_sock *isk, *n;
865 struct sock *sk;
866
867 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
868 sk = (struct sock *) isk;
869
870 if (sk->sk_state == IUCV_CONNECTED)
871 return POLLIN | POLLRDNORM;
872 }
873
874 return 0;
875 }
876
877 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
878 poll_table *wait)
879 {
880 struct sock *sk = sock->sk;
881 unsigned int mask = 0;
882
883 poll_wait(file, sk->sk_sleep, wait);
884
885 if (sk->sk_state == IUCV_LISTEN)
886 return iucv_accept_poll(sk);
887
888 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
889 mask |= POLLERR;
890
891 if (sk->sk_shutdown & RCV_SHUTDOWN)
892 mask |= POLLRDHUP;
893
894 if (sk->sk_shutdown == SHUTDOWN_MASK)
895 mask |= POLLHUP;
896
897 if (!skb_queue_empty(&sk->sk_receive_queue) ||
898 (sk->sk_shutdown & RCV_SHUTDOWN))
899 mask |= POLLIN | POLLRDNORM;
900
901 if (sk->sk_state == IUCV_CLOSED)
902 mask |= POLLHUP;
903
904 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
905 mask |= POLLIN;
906
907 if (sock_writeable(sk))
908 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
909 else
910 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
911
912 return mask;
913 }
914
915 static int iucv_sock_shutdown(struct socket *sock, int how)
916 {
917 struct sock *sk = sock->sk;
918 struct iucv_sock *iucv = iucv_sk(sk);
919 struct iucv_message txmsg;
920 int err = 0;
921 u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
922
923 how++;
924
925 if ((how & ~SHUTDOWN_MASK) || !how)
926 return -EINVAL;
927
928 lock_sock(sk);
929 switch (sk->sk_state) {
930 case IUCV_CLOSED:
931 err = -ENOTCONN;
932 goto fail;
933
934 default:
935 sk->sk_shutdown |= how;
936 break;
937 }
938
939 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
940 txmsg.class = 0;
941 txmsg.tag = 0;
942 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
943 (void *) prmmsg, 8);
944 if (err) {
945 switch (err) {
946 case 1:
947 err = -ENOTCONN;
948 break;
949 case 2:
950 err = -ECONNRESET;
951 break;
952 default:
953 err = -ENOTCONN;
954 break;
955 }
956 }
957 }
958
959 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
960 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
961 if (err)
962 err = -ENOTCONN;
963
964 skb_queue_purge(&sk->sk_receive_queue);
965 }
966
967 /* Wake up anyone sleeping in poll */
968 sk->sk_state_change(sk);
969
970 fail:
971 release_sock(sk);
972 return err;
973 }
974
975 static int iucv_sock_release(struct socket *sock)
976 {
977 struct sock *sk = sock->sk;
978 int err = 0;
979
980 if (!sk)
981 return 0;
982
983 iucv_sock_close(sk);
984
985 /* Unregister with IUCV base support */
986 if (iucv_sk(sk)->path) {
987 iucv_path_sever(iucv_sk(sk)->path, NULL);
988 iucv_path_free(iucv_sk(sk)->path);
989 iucv_sk(sk)->path = NULL;
990 }
991
992 sock_orphan(sk);
993 iucv_sock_kill(sk);
994 return err;
995 }
996
997 /* Callback wrappers - called from iucv base support */
998 static int iucv_callback_connreq(struct iucv_path *path,
999 u8 ipvmid[8], u8 ipuser[16])
1000 {
1001 unsigned char user_data[16];
1002 unsigned char nuser_data[16];
1003 unsigned char src_name[8];
1004 struct hlist_node *node;
1005 struct sock *sk, *nsk;
1006 struct iucv_sock *iucv, *niucv;
1007 int err;
1008
1009 memcpy(src_name, ipuser, 8);
1010 EBCASC(src_name, 8);
1011 /* Find out if this path belongs to af_iucv. */
1012 read_lock(&iucv_sk_list.lock);
1013 iucv = NULL;
1014 sk = NULL;
1015 sk_for_each(sk, node, &iucv_sk_list.head)
1016 if (sk->sk_state == IUCV_LISTEN &&
1017 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1018 /*
1019 * Found a listening socket with
1020 * src_name == ipuser[0-7].
1021 */
1022 iucv = iucv_sk(sk);
1023 break;
1024 }
1025 read_unlock(&iucv_sk_list.lock);
1026 if (!iucv)
1027 /* No socket found, not one of our paths. */
1028 return -EINVAL;
1029
1030 bh_lock_sock(sk);
1031
1032 /* Check if parent socket is listening */
1033 low_nmcpy(user_data, iucv->src_name);
1034 high_nmcpy(user_data, iucv->dst_name);
1035 ASCEBC(user_data, sizeof(user_data));
1036 if (sk->sk_state != IUCV_LISTEN) {
1037 err = iucv_path_sever(path, user_data);
1038 goto fail;
1039 }
1040
1041 /* Check for backlog size */
1042 if (sk_acceptq_is_full(sk)) {
1043 err = iucv_path_sever(path, user_data);
1044 goto fail;
1045 }
1046
1047 /* Create the new socket */
1048 nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
1049 if (!nsk) {
1050 err = iucv_path_sever(path, user_data);
1051 goto fail;
1052 }
1053
1054 niucv = iucv_sk(nsk);
1055 iucv_sock_init(nsk, sk);
1056
1057 /* Set the new iucv_sock */
1058 memcpy(niucv->dst_name, ipuser + 8, 8);
1059 EBCASC(niucv->dst_name, 8);
1060 memcpy(niucv->dst_user_id, ipvmid, 8);
1061 memcpy(niucv->src_name, iucv->src_name, 8);
1062 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1063 niucv->path = path;
1064
1065 /* Call iucv_accept */
1066 high_nmcpy(nuser_data, ipuser + 8);
1067 memcpy(nuser_data + 8, niucv->src_name, 8);
1068 ASCEBC(nuser_data + 8, 8);
1069
1070 path->msglim = IUCV_QUEUELEN_DEFAULT;
1071 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1072 if (err) {
1073 err = iucv_path_sever(path, user_data);
1074 goto fail;
1075 }
1076
1077 iucv_accept_enqueue(sk, nsk);
1078
1079 /* Wake up accept */
1080 nsk->sk_state = IUCV_CONNECTED;
1081 sk->sk_data_ready(sk, 1);
1082 err = 0;
1083 fail:
1084 bh_unlock_sock(sk);
1085 return 0;
1086 }
1087
1088 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1089 {
1090 struct sock *sk = path->private;
1091
1092 sk->sk_state = IUCV_CONNECTED;
1093 sk->sk_state_change(sk);
1094 }
1095
1096 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1097 {
1098 struct sock *sk = path->private;
1099 struct iucv_sock *iucv = iucv_sk(sk);
1100 struct sk_buff *skb;
1101 struct sock_msg_q *save_msg;
1102 int len;
1103
1104 if (sk->sk_shutdown & RCV_SHUTDOWN)
1105 return;
1106
1107 if (!list_empty(&iucv->message_q.list) ||
1108 !skb_queue_empty(&iucv->backlog_skb_q))
1109 goto save_message;
1110
1111 len = atomic_read(&sk->sk_rmem_alloc);
1112 len += msg->length + sizeof(struct sk_buff);
1113 if (len > sk->sk_rcvbuf)
1114 goto save_message;
1115
1116 skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
1117 if (!skb)
1118 goto save_message;
1119
1120 spin_lock(&iucv->message_q.lock);
1121 iucv_process_message(sk, skb, path, msg);
1122 spin_unlock(&iucv->message_q.lock);
1123
1124 return;
1125
1126 save_message:
1127 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1128 if (!save_msg)
1129 return;
1130 save_msg->path = path;
1131 save_msg->msg = *msg;
1132
1133 spin_lock(&iucv->message_q.lock);
1134 list_add_tail(&save_msg->list, &iucv->message_q.list);
1135 spin_unlock(&iucv->message_q.lock);
1136 }
1137
1138 static void iucv_callback_txdone(struct iucv_path *path,
1139 struct iucv_message *msg)
1140 {
1141 struct sock *sk = path->private;
1142 struct sk_buff *this = NULL;
1143 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1144 struct sk_buff *list_skb = list->next;
1145 unsigned long flags;
1146
1147 if (!skb_queue_empty(list)) {
1148 spin_lock_irqsave(&list->lock, flags);
1149
1150 while (list_skb != (struct sk_buff *)list) {
1151 if (!memcmp(&msg->tag, list_skb->cb, 4)) {
1152 this = list_skb;
1153 break;
1154 }
1155 list_skb = list_skb->next;
1156 }
1157 if (this)
1158 __skb_unlink(this, list);
1159
1160 spin_unlock_irqrestore(&list->lock, flags);
1161
1162 if (this)
1163 kfree_skb(this);
1164 }
1165 BUG_ON(!this);
1166
1167 if (sk->sk_state == IUCV_CLOSING) {
1168 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1169 sk->sk_state = IUCV_CLOSED;
1170 sk->sk_state_change(sk);
1171 }
1172 }
1173
1174 }
1175
1176 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1177 {
1178 struct sock *sk = path->private;
1179
1180 if (!list_empty(&iucv_sk(sk)->accept_q))
1181 sk->sk_state = IUCV_SEVERED;
1182 else
1183 sk->sk_state = IUCV_DISCONN;
1184
1185 sk->sk_state_change(sk);
1186 }
1187
1188 static struct proto_ops iucv_sock_ops = {
1189 .family = PF_IUCV,
1190 .owner = THIS_MODULE,
1191 .release = iucv_sock_release,
1192 .bind = iucv_sock_bind,
1193 .connect = iucv_sock_connect,
1194 .listen = iucv_sock_listen,
1195 .accept = iucv_sock_accept,
1196 .getname = iucv_sock_getname,
1197 .sendmsg = iucv_sock_sendmsg,
1198 .recvmsg = iucv_sock_recvmsg,
1199 .poll = iucv_sock_poll,
1200 .ioctl = sock_no_ioctl,
1201 .mmap = sock_no_mmap,
1202 .socketpair = sock_no_socketpair,
1203 .shutdown = iucv_sock_shutdown,
1204 .setsockopt = sock_no_setsockopt,
1205 .getsockopt = sock_no_getsockopt
1206 };
1207
1208 static struct net_proto_family iucv_sock_family_ops = {
1209 .family = AF_IUCV,
1210 .owner = THIS_MODULE,
1211 .create = iucv_sock_create,
1212 };
1213
1214 static int __init afiucv_init(void)
1215 {
1216 int err;
1217
1218 if (!MACHINE_IS_VM) {
1219 pr_err("The af_iucv module cannot be loaded"
1220 " without z/VM\n");
1221 err = -EPROTONOSUPPORT;
1222 goto out;
1223 }
1224 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1225 if (unlikely(err)) {
1226 WARN_ON(err);
1227 err = -EPROTONOSUPPORT;
1228 goto out;
1229 }
1230
1231 err = iucv_register(&af_iucv_handler, 0);
1232 if (err)
1233 goto out;
1234 err = proto_register(&iucv_proto, 0);
1235 if (err)
1236 goto out_iucv;
1237 err = sock_register(&iucv_sock_family_ops);
1238 if (err)
1239 goto out_proto;
1240 return 0;
1241
1242 out_proto:
1243 proto_unregister(&iucv_proto);
1244 out_iucv:
1245 iucv_unregister(&af_iucv_handler, 0);
1246 out:
1247 return err;
1248 }
1249
1250 static void __exit afiucv_exit(void)
1251 {
1252 sock_unregister(PF_IUCV);
1253 proto_unregister(&iucv_proto);
1254 iucv_unregister(&af_iucv_handler, 0);
1255 }
1256
1257 module_init(afiucv_init);
1258 module_exit(afiucv_exit);
1259
1260 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1261 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1262 MODULE_VERSION(VERSION);
1263 MODULE_LICENSE("GPL");
1264 MODULE_ALIAS_NETPROTO(PF_IUCV);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree