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