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Merge tag 'linux-kselftest-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-artful-kernel.git] / net / iucv / af_iucv.c
1 /*
2 * IUCV protocol stack for Linux on zSeries
3 *
4 * Copyright IBM Corp. 2006, 2009
5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
25 #include <net/sock.h>
26 #include <asm/ebcdic.h>
27 #include <asm/cpcmd.h>
28 #include <linux/kmod.h>
29
30 #include <net/iucv/af_iucv.h>
31
32 #define VERSION "1.2"
33
34 static char iucv_userid[80];
35
36 static const struct proto_ops iucv_sock_ops;
37
38 static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42 };
43
44 static struct iucv_interface *pr_iucv;
45
46 /* special AF_IUCV IPRM messages */
47 static const u8 iprm_shutdown[8] =
48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
49
50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
51
52 #define __iucv_sock_wait(sk, condition, timeo, ret) \
53 do { \
54 DEFINE_WAIT(__wait); \
55 long __timeo = timeo; \
56 ret = 0; \
57 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
58 while (!(condition)) { \
59 if (!__timeo) { \
60 ret = -EAGAIN; \
61 break; \
62 } \
63 if (signal_pending(current)) { \
64 ret = sock_intr_errno(__timeo); \
65 break; \
66 } \
67 release_sock(sk); \
68 __timeo = schedule_timeout(__timeo); \
69 lock_sock(sk); \
70 ret = sock_error(sk); \
71 if (ret) \
72 break; \
73 } \
74 finish_wait(sk_sleep(sk), &__wait); \
75 } while (0)
76
77 #define iucv_sock_wait(sk, condition, timeo) \
78 ({ \
79 int __ret = 0; \
80 if (!(condition)) \
81 __iucv_sock_wait(sk, condition, timeo, __ret); \
82 __ret; \
83 })
84
85 static void iucv_sock_kill(struct sock *sk);
86 static void iucv_sock_close(struct sock *sk);
87 static void iucv_sever_path(struct sock *, int);
88
89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
90 struct packet_type *pt, struct net_device *orig_dev);
91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
92 struct sk_buff *skb, u8 flags);
93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
94
95 /* Call Back functions */
96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_connack(struct iucv_path *, u8 *);
99 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
100 static void iucv_callback_connrej(struct iucv_path *, u8 *);
101 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
102
103 static struct iucv_sock_list iucv_sk_list = {
104 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
105 .autobind_name = ATOMIC_INIT(0)
106 };
107
108 static struct iucv_handler af_iucv_handler = {
109 .path_pending = iucv_callback_connreq,
110 .path_complete = iucv_callback_connack,
111 .path_severed = iucv_callback_connrej,
112 .message_pending = iucv_callback_rx,
113 .message_complete = iucv_callback_txdone,
114 .path_quiesced = iucv_callback_shutdown,
115 };
116
117 static inline void high_nmcpy(unsigned char *dst, char *src)
118 {
119 memcpy(dst, src, 8);
120 }
121
122 static inline void low_nmcpy(unsigned char *dst, char *src)
123 {
124 memcpy(&dst[8], src, 8);
125 }
126
127 static int afiucv_pm_prepare(struct device *dev)
128 {
129 #ifdef CONFIG_PM_DEBUG
130 printk(KERN_WARNING "afiucv_pm_prepare\n");
131 #endif
132 return 0;
133 }
134
135 static void afiucv_pm_complete(struct device *dev)
136 {
137 #ifdef CONFIG_PM_DEBUG
138 printk(KERN_WARNING "afiucv_pm_complete\n");
139 #endif
140 }
141
142 /**
143 * afiucv_pm_freeze() - Freeze PM callback
144 * @dev: AFIUCV dummy device
145 *
146 * Sever all established IUCV communication pathes
147 */
148 static int afiucv_pm_freeze(struct device *dev)
149 {
150 struct iucv_sock *iucv;
151 struct sock *sk;
152 int err = 0;
153
154 #ifdef CONFIG_PM_DEBUG
155 printk(KERN_WARNING "afiucv_pm_freeze\n");
156 #endif
157 read_lock(&iucv_sk_list.lock);
158 sk_for_each(sk, &iucv_sk_list.head) {
159 iucv = iucv_sk(sk);
160 switch (sk->sk_state) {
161 case IUCV_DISCONN:
162 case IUCV_CLOSING:
163 case IUCV_CONNECTED:
164 iucv_sever_path(sk, 0);
165 break;
166 case IUCV_OPEN:
167 case IUCV_BOUND:
168 case IUCV_LISTEN:
169 case IUCV_CLOSED:
170 default:
171 break;
172 }
173 skb_queue_purge(&iucv->send_skb_q);
174 skb_queue_purge(&iucv->backlog_skb_q);
175 }
176 read_unlock(&iucv_sk_list.lock);
177 return err;
178 }
179
180 /**
181 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
182 * @dev: AFIUCV dummy device
183 *
184 * socket clean up after freeze
185 */
186 static int afiucv_pm_restore_thaw(struct device *dev)
187 {
188 struct sock *sk;
189
190 #ifdef CONFIG_PM_DEBUG
191 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
192 #endif
193 read_lock(&iucv_sk_list.lock);
194 sk_for_each(sk, &iucv_sk_list.head) {
195 switch (sk->sk_state) {
196 case IUCV_CONNECTED:
197 sk->sk_err = EPIPE;
198 sk->sk_state = IUCV_DISCONN;
199 sk->sk_state_change(sk);
200 break;
201 case IUCV_DISCONN:
202 case IUCV_CLOSING:
203 case IUCV_LISTEN:
204 case IUCV_BOUND:
205 case IUCV_OPEN:
206 default:
207 break;
208 }
209 }
210 read_unlock(&iucv_sk_list.lock);
211 return 0;
212 }
213
214 static const struct dev_pm_ops afiucv_pm_ops = {
215 .prepare = afiucv_pm_prepare,
216 .complete = afiucv_pm_complete,
217 .freeze = afiucv_pm_freeze,
218 .thaw = afiucv_pm_restore_thaw,
219 .restore = afiucv_pm_restore_thaw,
220 };
221
222 static struct device_driver af_iucv_driver = {
223 .owner = THIS_MODULE,
224 .name = "afiucv",
225 .bus = NULL,
226 .pm = &afiucv_pm_ops,
227 };
228
229 /* dummy device used as trigger for PM functions */
230 static struct device *af_iucv_dev;
231
232 /**
233 * iucv_msg_length() - Returns the length of an iucv message.
234 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
235 *
236 * The function returns the length of the specified iucv message @msg of data
237 * stored in a buffer and of data stored in the parameter list (PRMDATA).
238 *
239 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
240 * data:
241 * PRMDATA[0..6] socket data (max 7 bytes);
242 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
243 *
244 * The socket data length is computed by subtracting the socket data length
245 * value from 0xFF.
246 * If the socket data len is greater 7, then PRMDATA can be used for special
247 * notifications (see iucv_sock_shutdown); and further,
248 * if the socket data len is > 7, the function returns 8.
249 *
250 * Use this function to allocate socket buffers to store iucv message data.
251 */
252 static inline size_t iucv_msg_length(struct iucv_message *msg)
253 {
254 size_t datalen;
255
256 if (msg->flags & IUCV_IPRMDATA) {
257 datalen = 0xff - msg->rmmsg[7];
258 return (datalen < 8) ? datalen : 8;
259 }
260 return msg->length;
261 }
262
263 /**
264 * iucv_sock_in_state() - check for specific states
265 * @sk: sock structure
266 * @state: first iucv sk state
267 * @state: second iucv sk state
268 *
269 * Returns true if the socket in either in the first or second state.
270 */
271 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
272 {
273 return (sk->sk_state == state || sk->sk_state == state2);
274 }
275
276 /**
277 * iucv_below_msglim() - function to check if messages can be sent
278 * @sk: sock structure
279 *
280 * Returns true if the send queue length is lower than the message limit.
281 * Always returns true if the socket is not connected (no iucv path for
282 * checking the message limit).
283 */
284 static inline int iucv_below_msglim(struct sock *sk)
285 {
286 struct iucv_sock *iucv = iucv_sk(sk);
287
288 if (sk->sk_state != IUCV_CONNECTED)
289 return 1;
290 if (iucv->transport == AF_IUCV_TRANS_IUCV)
291 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
292 else
293 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
294 (atomic_read(&iucv->pendings) <= 0));
295 }
296
297 /**
298 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
299 */
300 static void iucv_sock_wake_msglim(struct sock *sk)
301 {
302 struct socket_wq *wq;
303
304 rcu_read_lock();
305 wq = rcu_dereference(sk->sk_wq);
306 if (wq_has_sleeper(wq))
307 wake_up_interruptible_all(&wq->wait);
308 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
309 rcu_read_unlock();
310 }
311
312 /**
313 * afiucv_hs_send() - send a message through HiperSockets transport
314 */
315 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
316 struct sk_buff *skb, u8 flags)
317 {
318 struct iucv_sock *iucv = iucv_sk(sock);
319 struct af_iucv_trans_hdr *phs_hdr;
320 struct sk_buff *nskb;
321 int err, confirm_recv = 0;
322
323 memset(skb->head, 0, ETH_HLEN);
324 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
325 sizeof(struct af_iucv_trans_hdr));
326 skb_reset_mac_header(skb);
327 skb_reset_network_header(skb);
328 skb_push(skb, ETH_HLEN);
329 skb_reset_mac_header(skb);
330 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
331
332 phs_hdr->magic = ETH_P_AF_IUCV;
333 phs_hdr->version = 1;
334 phs_hdr->flags = flags;
335 if (flags == AF_IUCV_FLAG_SYN)
336 phs_hdr->window = iucv->msglimit;
337 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
338 confirm_recv = atomic_read(&iucv->msg_recv);
339 phs_hdr->window = confirm_recv;
340 if (confirm_recv)
341 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
342 }
343 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
344 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
345 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
346 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
347 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
348 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
349 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
350 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
351 if (imsg)
352 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
353
354 skb->dev = iucv->hs_dev;
355 if (!skb->dev)
356 return -ENODEV;
357 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
358 return -ENETDOWN;
359 if (skb->len > skb->dev->mtu) {
360 if (sock->sk_type == SOCK_SEQPACKET)
361 return -EMSGSIZE;
362 else
363 skb_trim(skb, skb->dev->mtu);
364 }
365 skb->protocol = ETH_P_AF_IUCV;
366 nskb = skb_clone(skb, GFP_ATOMIC);
367 if (!nskb)
368 return -ENOMEM;
369 skb_queue_tail(&iucv->send_skb_q, nskb);
370 err = dev_queue_xmit(skb);
371 if (net_xmit_eval(err)) {
372 skb_unlink(nskb, &iucv->send_skb_q);
373 kfree_skb(nskb);
374 } else {
375 atomic_sub(confirm_recv, &iucv->msg_recv);
376 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
377 }
378 return net_xmit_eval(err);
379 }
380
381 static struct sock *__iucv_get_sock_by_name(char *nm)
382 {
383 struct sock *sk;
384
385 sk_for_each(sk, &iucv_sk_list.head)
386 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
387 return sk;
388
389 return NULL;
390 }
391
392 static void iucv_sock_destruct(struct sock *sk)
393 {
394 skb_queue_purge(&sk->sk_receive_queue);
395 skb_queue_purge(&sk->sk_error_queue);
396
397 sk_mem_reclaim(sk);
398
399 if (!sock_flag(sk, SOCK_DEAD)) {
400 pr_err("Attempt to release alive iucv socket %p\n", sk);
401 return;
402 }
403
404 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
405 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
406 WARN_ON(sk->sk_wmem_queued);
407 WARN_ON(sk->sk_forward_alloc);
408 }
409
410 /* Cleanup Listen */
411 static void iucv_sock_cleanup_listen(struct sock *parent)
412 {
413 struct sock *sk;
414
415 /* Close non-accepted connections */
416 while ((sk = iucv_accept_dequeue(parent, NULL))) {
417 iucv_sock_close(sk);
418 iucv_sock_kill(sk);
419 }
420
421 parent->sk_state = IUCV_CLOSED;
422 }
423
424 /* Kill socket (only if zapped and orphaned) */
425 static void iucv_sock_kill(struct sock *sk)
426 {
427 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
428 return;
429
430 iucv_sock_unlink(&iucv_sk_list, sk);
431 sock_set_flag(sk, SOCK_DEAD);
432 sock_put(sk);
433 }
434
435 /* Terminate an IUCV path */
436 static void iucv_sever_path(struct sock *sk, int with_user_data)
437 {
438 unsigned char user_data[16];
439 struct iucv_sock *iucv = iucv_sk(sk);
440 struct iucv_path *path = iucv->path;
441
442 if (iucv->path) {
443 iucv->path = NULL;
444 if (with_user_data) {
445 low_nmcpy(user_data, iucv->src_name);
446 high_nmcpy(user_data, iucv->dst_name);
447 ASCEBC(user_data, sizeof(user_data));
448 pr_iucv->path_sever(path, user_data);
449 } else
450 pr_iucv->path_sever(path, NULL);
451 iucv_path_free(path);
452 }
453 }
454
455 /* Send FIN through an IUCV socket for HIPER transport */
456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
457 {
458 int err = 0;
459 int blen;
460 struct sk_buff *skb;
461
462 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
463 skb = sock_alloc_send_skb(sk, blen, 1, &err);
464 if (skb) {
465 skb_reserve(skb, blen);
466 err = afiucv_hs_send(NULL, sk, skb, flags);
467 }
468 return err;
469 }
470
471 /* Close an IUCV socket */
472 static void iucv_sock_close(struct sock *sk)
473 {
474 struct iucv_sock *iucv = iucv_sk(sk);
475 unsigned long timeo;
476 int err = 0;
477
478 lock_sock(sk);
479
480 switch (sk->sk_state) {
481 case IUCV_LISTEN:
482 iucv_sock_cleanup_listen(sk);
483 break;
484
485 case IUCV_CONNECTED:
486 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
487 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
488 sk->sk_state = IUCV_DISCONN;
489 sk->sk_state_change(sk);
490 }
491 case IUCV_DISCONN: /* fall through */
492 sk->sk_state = IUCV_CLOSING;
493 sk->sk_state_change(sk);
494
495 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
496 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
497 timeo = sk->sk_lingertime;
498 else
499 timeo = IUCV_DISCONN_TIMEOUT;
500 iucv_sock_wait(sk,
501 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
502 timeo);
503 }
504
505 case IUCV_CLOSING: /* fall through */
506 sk->sk_state = IUCV_CLOSED;
507 sk->sk_state_change(sk);
508
509 sk->sk_err = ECONNRESET;
510 sk->sk_state_change(sk);
511
512 skb_queue_purge(&iucv->send_skb_q);
513 skb_queue_purge(&iucv->backlog_skb_q);
514
515 default: /* fall through */
516 iucv_sever_path(sk, 1);
517 }
518
519 if (iucv->hs_dev) {
520 dev_put(iucv->hs_dev);
521 iucv->hs_dev = NULL;
522 sk->sk_bound_dev_if = 0;
523 }
524
525 /* mark socket for deletion by iucv_sock_kill() */
526 sock_set_flag(sk, SOCK_ZAPPED);
527
528 release_sock(sk);
529 }
530
531 static void iucv_sock_init(struct sock *sk, struct sock *parent)
532 {
533 if (parent)
534 sk->sk_type = parent->sk_type;
535 }
536
537 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
538 {
539 struct sock *sk;
540 struct iucv_sock *iucv;
541
542 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
543 if (!sk)
544 return NULL;
545 iucv = iucv_sk(sk);
546
547 sock_init_data(sock, sk);
548 INIT_LIST_HEAD(&iucv->accept_q);
549 spin_lock_init(&iucv->accept_q_lock);
550 skb_queue_head_init(&iucv->send_skb_q);
551 INIT_LIST_HEAD(&iucv->message_q.list);
552 spin_lock_init(&iucv->message_q.lock);
553 skb_queue_head_init(&iucv->backlog_skb_q);
554 iucv->send_tag = 0;
555 atomic_set(&iucv->pendings, 0);
556 iucv->flags = 0;
557 iucv->msglimit = 0;
558 atomic_set(&iucv->msg_sent, 0);
559 atomic_set(&iucv->msg_recv, 0);
560 iucv->path = NULL;
561 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
562 memset(&iucv->src_user_id , 0, 32);
563 if (pr_iucv)
564 iucv->transport = AF_IUCV_TRANS_IUCV;
565 else
566 iucv->transport = AF_IUCV_TRANS_HIPER;
567
568 sk->sk_destruct = iucv_sock_destruct;
569 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
570 sk->sk_allocation = GFP_DMA;
571
572 sock_reset_flag(sk, SOCK_ZAPPED);
573
574 sk->sk_protocol = proto;
575 sk->sk_state = IUCV_OPEN;
576
577 iucv_sock_link(&iucv_sk_list, sk);
578 return sk;
579 }
580
581 /* Create an IUCV socket */
582 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
583 int kern)
584 {
585 struct sock *sk;
586
587 if (protocol && protocol != PF_IUCV)
588 return -EPROTONOSUPPORT;
589
590 sock->state = SS_UNCONNECTED;
591
592 switch (sock->type) {
593 case SOCK_STREAM:
594 sock->ops = &iucv_sock_ops;
595 break;
596 case SOCK_SEQPACKET:
597 /* currently, proto ops can handle both sk types */
598 sock->ops = &iucv_sock_ops;
599 break;
600 default:
601 return -ESOCKTNOSUPPORT;
602 }
603
604 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
605 if (!sk)
606 return -ENOMEM;
607
608 iucv_sock_init(sk, NULL);
609
610 return 0;
611 }
612
613 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
614 {
615 write_lock_bh(&l->lock);
616 sk_add_node(sk, &l->head);
617 write_unlock_bh(&l->lock);
618 }
619
620 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
621 {
622 write_lock_bh(&l->lock);
623 sk_del_node_init(sk);
624 write_unlock_bh(&l->lock);
625 }
626
627 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
628 {
629 unsigned long flags;
630 struct iucv_sock *par = iucv_sk(parent);
631
632 sock_hold(sk);
633 spin_lock_irqsave(&par->accept_q_lock, flags);
634 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
635 spin_unlock_irqrestore(&par->accept_q_lock, flags);
636 iucv_sk(sk)->parent = parent;
637 sk_acceptq_added(parent);
638 }
639
640 void iucv_accept_unlink(struct sock *sk)
641 {
642 unsigned long flags;
643 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
644
645 spin_lock_irqsave(&par->accept_q_lock, flags);
646 list_del_init(&iucv_sk(sk)->accept_q);
647 spin_unlock_irqrestore(&par->accept_q_lock, flags);
648 sk_acceptq_removed(iucv_sk(sk)->parent);
649 iucv_sk(sk)->parent = NULL;
650 sock_put(sk);
651 }
652
653 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
654 {
655 struct iucv_sock *isk, *n;
656 struct sock *sk;
657
658 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
659 sk = (struct sock *) isk;
660 lock_sock(sk);
661
662 if (sk->sk_state == IUCV_CLOSED) {
663 iucv_accept_unlink(sk);
664 release_sock(sk);
665 continue;
666 }
667
668 if (sk->sk_state == IUCV_CONNECTED ||
669 sk->sk_state == IUCV_DISCONN ||
670 !newsock) {
671 iucv_accept_unlink(sk);
672 if (newsock)
673 sock_graft(sk, newsock);
674
675 release_sock(sk);
676 return sk;
677 }
678
679 release_sock(sk);
680 }
681 return NULL;
682 }
683
684 static void __iucv_auto_name(struct iucv_sock *iucv)
685 {
686 char name[12];
687
688 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
689 while (__iucv_get_sock_by_name(name)) {
690 sprintf(name, "%08x",
691 atomic_inc_return(&iucv_sk_list.autobind_name));
692 }
693 memcpy(iucv->src_name, name, 8);
694 }
695
696 /* Bind an unbound socket */
697 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
698 int addr_len)
699 {
700 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
701 struct sock *sk = sock->sk;
702 struct iucv_sock *iucv;
703 int err = 0;
704 struct net_device *dev;
705 char uid[9];
706
707 /* Verify the input sockaddr */
708 if (!addr || addr->sa_family != AF_IUCV)
709 return -EINVAL;
710
711 lock_sock(sk);
712 if (sk->sk_state != IUCV_OPEN) {
713 err = -EBADFD;
714 goto done;
715 }
716
717 write_lock_bh(&iucv_sk_list.lock);
718
719 iucv = iucv_sk(sk);
720 if (__iucv_get_sock_by_name(sa->siucv_name)) {
721 err = -EADDRINUSE;
722 goto done_unlock;
723 }
724 if (iucv->path)
725 goto done_unlock;
726
727 /* Bind the socket */
728 if (pr_iucv)
729 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
730 goto vm_bind; /* VM IUCV transport */
731
732 /* try hiper transport */
733 memcpy(uid, sa->siucv_user_id, sizeof(uid));
734 ASCEBC(uid, 8);
735 rcu_read_lock();
736 for_each_netdev_rcu(&init_net, dev) {
737 if (!memcmp(dev->perm_addr, uid, 8)) {
738 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
739 /* Check for unitialized siucv_name */
740 if (strncmp(sa->siucv_name, " ", 8) == 0)
741 __iucv_auto_name(iucv);
742 else
743 memcpy(iucv->src_name, sa->siucv_name, 8);
744 sk->sk_bound_dev_if = dev->ifindex;
745 iucv->hs_dev = dev;
746 dev_hold(dev);
747 sk->sk_state = IUCV_BOUND;
748 iucv->transport = AF_IUCV_TRANS_HIPER;
749 if (!iucv->msglimit)
750 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
751 rcu_read_unlock();
752 goto done_unlock;
753 }
754 }
755 rcu_read_unlock();
756 vm_bind:
757 if (pr_iucv) {
758 /* use local userid for backward compat */
759 memcpy(iucv->src_name, sa->siucv_name, 8);
760 memcpy(iucv->src_user_id, iucv_userid, 8);
761 sk->sk_state = IUCV_BOUND;
762 iucv->transport = AF_IUCV_TRANS_IUCV;
763 if (!iucv->msglimit)
764 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
765 goto done_unlock;
766 }
767 /* found no dev to bind */
768 err = -ENODEV;
769 done_unlock:
770 /* Release the socket list lock */
771 write_unlock_bh(&iucv_sk_list.lock);
772 done:
773 release_sock(sk);
774 return err;
775 }
776
777 /* Automatically bind an unbound socket */
778 static int iucv_sock_autobind(struct sock *sk)
779 {
780 struct iucv_sock *iucv = iucv_sk(sk);
781 int err = 0;
782
783 if (unlikely(!pr_iucv))
784 return -EPROTO;
785
786 memcpy(iucv->src_user_id, iucv_userid, 8);
787
788 write_lock_bh(&iucv_sk_list.lock);
789 __iucv_auto_name(iucv);
790 write_unlock_bh(&iucv_sk_list.lock);
791
792 if (!iucv->msglimit)
793 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
794
795 return err;
796 }
797
798 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
799 {
800 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
801 struct sock *sk = sock->sk;
802 struct iucv_sock *iucv = iucv_sk(sk);
803 unsigned char user_data[16];
804 int err;
805
806 high_nmcpy(user_data, sa->siucv_name);
807 low_nmcpy(user_data, iucv->src_name);
808 ASCEBC(user_data, sizeof(user_data));
809
810 /* Create path. */
811 iucv->path = iucv_path_alloc(iucv->msglimit,
812 IUCV_IPRMDATA, GFP_KERNEL);
813 if (!iucv->path) {
814 err = -ENOMEM;
815 goto done;
816 }
817 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
818 sa->siucv_user_id, NULL, user_data,
819 sk);
820 if (err) {
821 iucv_path_free(iucv->path);
822 iucv->path = NULL;
823 switch (err) {
824 case 0x0b: /* Target communicator is not logged on */
825 err = -ENETUNREACH;
826 break;
827 case 0x0d: /* Max connections for this guest exceeded */
828 case 0x0e: /* Max connections for target guest exceeded */
829 err = -EAGAIN;
830 break;
831 case 0x0f: /* Missing IUCV authorization */
832 err = -EACCES;
833 break;
834 default:
835 err = -ECONNREFUSED;
836 break;
837 }
838 }
839 done:
840 return err;
841 }
842
843 /* Connect an unconnected socket */
844 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
845 int alen, int flags)
846 {
847 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
848 struct sock *sk = sock->sk;
849 struct iucv_sock *iucv = iucv_sk(sk);
850 int err;
851
852 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
853 return -EINVAL;
854
855 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
856 return -EBADFD;
857
858 if (sk->sk_state == IUCV_OPEN &&
859 iucv->transport == AF_IUCV_TRANS_HIPER)
860 return -EBADFD; /* explicit bind required */
861
862 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
863 return -EINVAL;
864
865 if (sk->sk_state == IUCV_OPEN) {
866 err = iucv_sock_autobind(sk);
867 if (unlikely(err))
868 return err;
869 }
870
871 lock_sock(sk);
872
873 /* Set the destination information */
874 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
875 memcpy(iucv->dst_name, sa->siucv_name, 8);
876
877 if (iucv->transport == AF_IUCV_TRANS_HIPER)
878 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
879 else
880 err = afiucv_path_connect(sock, addr);
881 if (err)
882 goto done;
883
884 if (sk->sk_state != IUCV_CONNECTED)
885 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
886 IUCV_DISCONN),
887 sock_sndtimeo(sk, flags & O_NONBLOCK));
888
889 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
890 err = -ECONNREFUSED;
891
892 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
893 iucv_sever_path(sk, 0);
894
895 done:
896 release_sock(sk);
897 return err;
898 }
899
900 /* Move a socket into listening state. */
901 static int iucv_sock_listen(struct socket *sock, int backlog)
902 {
903 struct sock *sk = sock->sk;
904 int err;
905
906 lock_sock(sk);
907
908 err = -EINVAL;
909 if (sk->sk_state != IUCV_BOUND)
910 goto done;
911
912 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
913 goto done;
914
915 sk->sk_max_ack_backlog = backlog;
916 sk->sk_ack_backlog = 0;
917 sk->sk_state = IUCV_LISTEN;
918 err = 0;
919
920 done:
921 release_sock(sk);
922 return err;
923 }
924
925 /* Accept a pending connection */
926 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
927 int flags)
928 {
929 DECLARE_WAITQUEUE(wait, current);
930 struct sock *sk = sock->sk, *nsk;
931 long timeo;
932 int err = 0;
933
934 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
935
936 if (sk->sk_state != IUCV_LISTEN) {
937 err = -EBADFD;
938 goto done;
939 }
940
941 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
942
943 /* Wait for an incoming connection */
944 add_wait_queue_exclusive(sk_sleep(sk), &wait);
945 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
946 set_current_state(TASK_INTERRUPTIBLE);
947 if (!timeo) {
948 err = -EAGAIN;
949 break;
950 }
951
952 release_sock(sk);
953 timeo = schedule_timeout(timeo);
954 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
955
956 if (sk->sk_state != IUCV_LISTEN) {
957 err = -EBADFD;
958 break;
959 }
960
961 if (signal_pending(current)) {
962 err = sock_intr_errno(timeo);
963 break;
964 }
965 }
966
967 set_current_state(TASK_RUNNING);
968 remove_wait_queue(sk_sleep(sk), &wait);
969
970 if (err)
971 goto done;
972
973 newsock->state = SS_CONNECTED;
974
975 done:
976 release_sock(sk);
977 return err;
978 }
979
980 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
981 int *len, int peer)
982 {
983 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
984 struct sock *sk = sock->sk;
985 struct iucv_sock *iucv = iucv_sk(sk);
986
987 addr->sa_family = AF_IUCV;
988 *len = sizeof(struct sockaddr_iucv);
989
990 if (peer) {
991 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
992 memcpy(siucv->siucv_name, iucv->dst_name, 8);
993 } else {
994 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
995 memcpy(siucv->siucv_name, iucv->src_name, 8);
996 }
997 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
998 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
999 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1000
1001 return 0;
1002 }
1003
1004 /**
1005 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1006 * @path: IUCV path
1007 * @msg: Pointer to a struct iucv_message
1008 * @skb: The socket data to send, skb->len MUST BE <= 7
1009 *
1010 * Send the socket data in the parameter list in the iucv message
1011 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1012 * list and the socket data len at index 7 (last byte).
1013 * See also iucv_msg_length().
1014 *
1015 * Returns the error code from the iucv_message_send() call.
1016 */
1017 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1018 struct sk_buff *skb)
1019 {
1020 u8 prmdata[8];
1021
1022 memcpy(prmdata, (void *) skb->data, skb->len);
1023 prmdata[7] = 0xff - (u8) skb->len;
1024 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1025 (void *) prmdata, 8);
1026 }
1027
1028 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1029 size_t len)
1030 {
1031 struct sock *sk = sock->sk;
1032 struct iucv_sock *iucv = iucv_sk(sk);
1033 struct sk_buff *skb;
1034 struct iucv_message txmsg;
1035 struct cmsghdr *cmsg;
1036 int cmsg_done;
1037 long timeo;
1038 char user_id[9];
1039 char appl_id[9];
1040 int err;
1041 int noblock = msg->msg_flags & MSG_DONTWAIT;
1042
1043 err = sock_error(sk);
1044 if (err)
1045 return err;
1046
1047 if (msg->msg_flags & MSG_OOB)
1048 return -EOPNOTSUPP;
1049
1050 /* SOCK_SEQPACKET: we do not support segmented records */
1051 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1052 return -EOPNOTSUPP;
1053
1054 lock_sock(sk);
1055
1056 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1057 err = -EPIPE;
1058 goto out;
1059 }
1060
1061 /* Return if the socket is not in connected state */
1062 if (sk->sk_state != IUCV_CONNECTED) {
1063 err = -ENOTCONN;
1064 goto out;
1065 }
1066
1067 /* initialize defaults */
1068 cmsg_done = 0; /* check for duplicate headers */
1069 txmsg.class = 0;
1070
1071 /* iterate over control messages */
1072 for_each_cmsghdr(cmsg, msg) {
1073 if (!CMSG_OK(msg, cmsg)) {
1074 err = -EINVAL;
1075 goto out;
1076 }
1077
1078 if (cmsg->cmsg_level != SOL_IUCV)
1079 continue;
1080
1081 if (cmsg->cmsg_type & cmsg_done) {
1082 err = -EINVAL;
1083 goto out;
1084 }
1085 cmsg_done |= cmsg->cmsg_type;
1086
1087 switch (cmsg->cmsg_type) {
1088 case SCM_IUCV_TRGCLS:
1089 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1090 err = -EINVAL;
1091 goto out;
1092 }
1093
1094 /* set iucv message target class */
1095 memcpy(&txmsg.class,
1096 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1097
1098 break;
1099
1100 default:
1101 err = -EINVAL;
1102 goto out;
1103 }
1104 }
1105
1106 /* allocate one skb for each iucv message:
1107 * this is fine for SOCK_SEQPACKET (unless we want to support
1108 * segmented records using the MSG_EOR flag), but
1109 * for SOCK_STREAM we might want to improve it in future */
1110 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1111 skb = sock_alloc_send_skb(sk,
1112 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1113 noblock, &err);
1114 else
1115 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1116 if (!skb)
1117 goto out;
1118 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1119 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1120 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1121 err = -EFAULT;
1122 goto fail;
1123 }
1124
1125 /* wait if outstanding messages for iucv path has reached */
1126 timeo = sock_sndtimeo(sk, noblock);
1127 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1128 if (err)
1129 goto fail;
1130
1131 /* return -ECONNRESET if the socket is no longer connected */
1132 if (sk->sk_state != IUCV_CONNECTED) {
1133 err = -ECONNRESET;
1134 goto fail;
1135 }
1136
1137 /* increment and save iucv message tag for msg_completion cbk */
1138 txmsg.tag = iucv->send_tag++;
1139 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1140
1141 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1142 atomic_inc(&iucv->msg_sent);
1143 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1144 if (err) {
1145 atomic_dec(&iucv->msg_sent);
1146 goto fail;
1147 }
1148 goto release;
1149 }
1150 skb_queue_tail(&iucv->send_skb_q, skb);
1151
1152 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1153 && skb->len <= 7) {
1154 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1155
1156 /* on success: there is no message_complete callback
1157 * for an IPRMDATA msg; remove skb from send queue */
1158 if (err == 0) {
1159 skb_unlink(skb, &iucv->send_skb_q);
1160 kfree_skb(skb);
1161 }
1162
1163 /* this error should never happen since the
1164 * IUCV_IPRMDATA path flag is set... sever path */
1165 if (err == 0x15) {
1166 pr_iucv->path_sever(iucv->path, NULL);
1167 skb_unlink(skb, &iucv->send_skb_q);
1168 err = -EPIPE;
1169 goto fail;
1170 }
1171 } else
1172 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1173 (void *) skb->data, skb->len);
1174 if (err) {
1175 if (err == 3) {
1176 user_id[8] = 0;
1177 memcpy(user_id, iucv->dst_user_id, 8);
1178 appl_id[8] = 0;
1179 memcpy(appl_id, iucv->dst_name, 8);
1180 pr_err("Application %s on z/VM guest %s"
1181 " exceeds message limit\n",
1182 appl_id, user_id);
1183 err = -EAGAIN;
1184 } else
1185 err = -EPIPE;
1186 skb_unlink(skb, &iucv->send_skb_q);
1187 goto fail;
1188 }
1189
1190 release:
1191 release_sock(sk);
1192 return len;
1193
1194 fail:
1195 kfree_skb(skb);
1196 out:
1197 release_sock(sk);
1198 return err;
1199 }
1200
1201 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1202 *
1203 * Locking: must be called with message_q.lock held
1204 */
1205 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1206 {
1207 int dataleft, size, copied = 0;
1208 struct sk_buff *nskb;
1209
1210 dataleft = len;
1211 while (dataleft) {
1212 if (dataleft >= sk->sk_rcvbuf / 4)
1213 size = sk->sk_rcvbuf / 4;
1214 else
1215 size = dataleft;
1216
1217 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1218 if (!nskb)
1219 return -ENOMEM;
1220
1221 /* copy target class to control buffer of new skb */
1222 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1223
1224 /* copy data fragment */
1225 memcpy(nskb->data, skb->data + copied, size);
1226 copied += size;
1227 dataleft -= size;
1228
1229 skb_reset_transport_header(nskb);
1230 skb_reset_network_header(nskb);
1231 nskb->len = size;
1232
1233 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1234 }
1235
1236 return 0;
1237 }
1238
1239 /* iucv_process_message() - Receive a single outstanding IUCV message
1240 *
1241 * Locking: must be called with message_q.lock held
1242 */
1243 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1244 struct iucv_path *path,
1245 struct iucv_message *msg)
1246 {
1247 int rc;
1248 unsigned int len;
1249
1250 len = iucv_msg_length(msg);
1251
1252 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1253 /* Note: the first 4 bytes are reserved for msg tag */
1254 IUCV_SKB_CB(skb)->class = msg->class;
1255
1256 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1257 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1258 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1259 skb->data = NULL;
1260 skb->len = 0;
1261 }
1262 } else {
1263 rc = pr_iucv->message_receive(path, msg,
1264 msg->flags & IUCV_IPRMDATA,
1265 skb->data, len, NULL);
1266 if (rc) {
1267 kfree_skb(skb);
1268 return;
1269 }
1270 /* we need to fragment iucv messages for SOCK_STREAM only;
1271 * for SOCK_SEQPACKET, it is only relevant if we support
1272 * record segmentation using MSG_EOR (see also recvmsg()) */
1273 if (sk->sk_type == SOCK_STREAM &&
1274 skb->truesize >= sk->sk_rcvbuf / 4) {
1275 rc = iucv_fragment_skb(sk, skb, len);
1276 kfree_skb(skb);
1277 skb = NULL;
1278 if (rc) {
1279 pr_iucv->path_sever(path, NULL);
1280 return;
1281 }
1282 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1283 } else {
1284 skb_reset_transport_header(skb);
1285 skb_reset_network_header(skb);
1286 skb->len = len;
1287 }
1288 }
1289
1290 IUCV_SKB_CB(skb)->offset = 0;
1291 if (sock_queue_rcv_skb(sk, skb))
1292 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1293 }
1294
1295 /* iucv_process_message_q() - Process outstanding IUCV messages
1296 *
1297 * Locking: must be called with message_q.lock held
1298 */
1299 static void iucv_process_message_q(struct sock *sk)
1300 {
1301 struct iucv_sock *iucv = iucv_sk(sk);
1302 struct sk_buff *skb;
1303 struct sock_msg_q *p, *n;
1304
1305 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1306 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1307 if (!skb)
1308 break;
1309 iucv_process_message(sk, skb, p->path, &p->msg);
1310 list_del(&p->list);
1311 kfree(p);
1312 if (!skb_queue_empty(&iucv->backlog_skb_q))
1313 break;
1314 }
1315 }
1316
1317 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1318 size_t len, int flags)
1319 {
1320 int noblock = flags & MSG_DONTWAIT;
1321 struct sock *sk = sock->sk;
1322 struct iucv_sock *iucv = iucv_sk(sk);
1323 unsigned int copied, rlen;
1324 struct sk_buff *skb, *rskb, *cskb;
1325 int err = 0;
1326 u32 offset;
1327
1328 if ((sk->sk_state == IUCV_DISCONN) &&
1329 skb_queue_empty(&iucv->backlog_skb_q) &&
1330 skb_queue_empty(&sk->sk_receive_queue) &&
1331 list_empty(&iucv->message_q.list))
1332 return 0;
1333
1334 if (flags & (MSG_OOB))
1335 return -EOPNOTSUPP;
1336
1337 /* receive/dequeue next skb:
1338 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1339 skb = skb_recv_datagram(sk, flags, noblock, &err);
1340 if (!skb) {
1341 if (sk->sk_shutdown & RCV_SHUTDOWN)
1342 return 0;
1343 return err;
1344 }
1345
1346 offset = IUCV_SKB_CB(skb)->offset;
1347 rlen = skb->len - offset; /* real length of skb */
1348 copied = min_t(unsigned int, rlen, len);
1349 if (!rlen)
1350 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1351
1352 cskb = skb;
1353 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1354 if (!(flags & MSG_PEEK))
1355 skb_queue_head(&sk->sk_receive_queue, skb);
1356 return -EFAULT;
1357 }
1358
1359 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1360 if (sk->sk_type == SOCK_SEQPACKET) {
1361 if (copied < rlen)
1362 msg->msg_flags |= MSG_TRUNC;
1363 /* each iucv message contains a complete record */
1364 msg->msg_flags |= MSG_EOR;
1365 }
1366
1367 /* create control message to store iucv msg target class:
1368 * get the trgcls from the control buffer of the skb due to
1369 * fragmentation of original iucv message. */
1370 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1371 sizeof(IUCV_SKB_CB(skb)->class),
1372 (void *)&IUCV_SKB_CB(skb)->class);
1373 if (err) {
1374 if (!(flags & MSG_PEEK))
1375 skb_queue_head(&sk->sk_receive_queue, skb);
1376 return err;
1377 }
1378
1379 /* Mark read part of skb as used */
1380 if (!(flags & MSG_PEEK)) {
1381
1382 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1383 if (sk->sk_type == SOCK_STREAM) {
1384 if (copied < rlen) {
1385 IUCV_SKB_CB(skb)->offset = offset + copied;
1386 skb_queue_head(&sk->sk_receive_queue, skb);
1387 goto done;
1388 }
1389 }
1390
1391 kfree_skb(skb);
1392 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1393 atomic_inc(&iucv->msg_recv);
1394 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1395 WARN_ON(1);
1396 iucv_sock_close(sk);
1397 return -EFAULT;
1398 }
1399 }
1400
1401 /* Queue backlog skbs */
1402 spin_lock_bh(&iucv->message_q.lock);
1403 rskb = skb_dequeue(&iucv->backlog_skb_q);
1404 while (rskb) {
1405 IUCV_SKB_CB(rskb)->offset = 0;
1406 if (sock_queue_rcv_skb(sk, rskb)) {
1407 skb_queue_head(&iucv->backlog_skb_q,
1408 rskb);
1409 break;
1410 } else {
1411 rskb = skb_dequeue(&iucv->backlog_skb_q);
1412 }
1413 }
1414 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1415 if (!list_empty(&iucv->message_q.list))
1416 iucv_process_message_q(sk);
1417 if (atomic_read(&iucv->msg_recv) >=
1418 iucv->msglimit / 2) {
1419 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1420 if (err) {
1421 sk->sk_state = IUCV_DISCONN;
1422 sk->sk_state_change(sk);
1423 }
1424 }
1425 }
1426 spin_unlock_bh(&iucv->message_q.lock);
1427 }
1428
1429 done:
1430 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1431 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1432 copied = rlen;
1433
1434 return copied;
1435 }
1436
1437 static inline unsigned int iucv_accept_poll(struct sock *parent)
1438 {
1439 struct iucv_sock *isk, *n;
1440 struct sock *sk;
1441
1442 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1443 sk = (struct sock *) isk;
1444
1445 if (sk->sk_state == IUCV_CONNECTED)
1446 return POLLIN | POLLRDNORM;
1447 }
1448
1449 return 0;
1450 }
1451
1452 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1453 poll_table *wait)
1454 {
1455 struct sock *sk = sock->sk;
1456 unsigned int mask = 0;
1457
1458 sock_poll_wait(file, sk_sleep(sk), wait);
1459
1460 if (sk->sk_state == IUCV_LISTEN)
1461 return iucv_accept_poll(sk);
1462
1463 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1464 mask |= POLLERR |
1465 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1466
1467 if (sk->sk_shutdown & RCV_SHUTDOWN)
1468 mask |= POLLRDHUP;
1469
1470 if (sk->sk_shutdown == SHUTDOWN_MASK)
1471 mask |= POLLHUP;
1472
1473 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1474 (sk->sk_shutdown & RCV_SHUTDOWN))
1475 mask |= POLLIN | POLLRDNORM;
1476
1477 if (sk->sk_state == IUCV_CLOSED)
1478 mask |= POLLHUP;
1479
1480 if (sk->sk_state == IUCV_DISCONN)
1481 mask |= POLLIN;
1482
1483 if (sock_writeable(sk) && iucv_below_msglim(sk))
1484 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1485 else
1486 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1487
1488 return mask;
1489 }
1490
1491 static int iucv_sock_shutdown(struct socket *sock, int how)
1492 {
1493 struct sock *sk = sock->sk;
1494 struct iucv_sock *iucv = iucv_sk(sk);
1495 struct iucv_message txmsg;
1496 int err = 0;
1497
1498 how++;
1499
1500 if ((how & ~SHUTDOWN_MASK) || !how)
1501 return -EINVAL;
1502
1503 lock_sock(sk);
1504 switch (sk->sk_state) {
1505 case IUCV_LISTEN:
1506 case IUCV_DISCONN:
1507 case IUCV_CLOSING:
1508 case IUCV_CLOSED:
1509 err = -ENOTCONN;
1510 goto fail;
1511 default:
1512 break;
1513 }
1514
1515 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1516 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1517 txmsg.class = 0;
1518 txmsg.tag = 0;
1519 err = pr_iucv->message_send(iucv->path, &txmsg,
1520 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1521 if (err) {
1522 switch (err) {
1523 case 1:
1524 err = -ENOTCONN;
1525 break;
1526 case 2:
1527 err = -ECONNRESET;
1528 break;
1529 default:
1530 err = -ENOTCONN;
1531 break;
1532 }
1533 }
1534 } else
1535 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1536 }
1537
1538 sk->sk_shutdown |= how;
1539 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1540 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1541 iucv->path) {
1542 err = pr_iucv->path_quiesce(iucv->path, NULL);
1543 if (err)
1544 err = -ENOTCONN;
1545 /* skb_queue_purge(&sk->sk_receive_queue); */
1546 }
1547 skb_queue_purge(&sk->sk_receive_queue);
1548 }
1549
1550 /* Wake up anyone sleeping in poll */
1551 sk->sk_state_change(sk);
1552
1553 fail:
1554 release_sock(sk);
1555 return err;
1556 }
1557
1558 static int iucv_sock_release(struct socket *sock)
1559 {
1560 struct sock *sk = sock->sk;
1561 int err = 0;
1562
1563 if (!sk)
1564 return 0;
1565
1566 iucv_sock_close(sk);
1567
1568 sock_orphan(sk);
1569 iucv_sock_kill(sk);
1570 return err;
1571 }
1572
1573 /* getsockopt and setsockopt */
1574 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1575 char __user *optval, unsigned int optlen)
1576 {
1577 struct sock *sk = sock->sk;
1578 struct iucv_sock *iucv = iucv_sk(sk);
1579 int val;
1580 int rc;
1581
1582 if (level != SOL_IUCV)
1583 return -ENOPROTOOPT;
1584
1585 if (optlen < sizeof(int))
1586 return -EINVAL;
1587
1588 if (get_user(val, (int __user *) optval))
1589 return -EFAULT;
1590
1591 rc = 0;
1592
1593 lock_sock(sk);
1594 switch (optname) {
1595 case SO_IPRMDATA_MSG:
1596 if (val)
1597 iucv->flags |= IUCV_IPRMDATA;
1598 else
1599 iucv->flags &= ~IUCV_IPRMDATA;
1600 break;
1601 case SO_MSGLIMIT:
1602 switch (sk->sk_state) {
1603 case IUCV_OPEN:
1604 case IUCV_BOUND:
1605 if (val < 1 || val > (u16)(~0))
1606 rc = -EINVAL;
1607 else
1608 iucv->msglimit = val;
1609 break;
1610 default:
1611 rc = -EINVAL;
1612 break;
1613 }
1614 break;
1615 default:
1616 rc = -ENOPROTOOPT;
1617 break;
1618 }
1619 release_sock(sk);
1620
1621 return rc;
1622 }
1623
1624 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1625 char __user *optval, int __user *optlen)
1626 {
1627 struct sock *sk = sock->sk;
1628 struct iucv_sock *iucv = iucv_sk(sk);
1629 unsigned int val;
1630 int len;
1631
1632 if (level != SOL_IUCV)
1633 return -ENOPROTOOPT;
1634
1635 if (get_user(len, optlen))
1636 return -EFAULT;
1637
1638 if (len < 0)
1639 return -EINVAL;
1640
1641 len = min_t(unsigned int, len, sizeof(int));
1642
1643 switch (optname) {
1644 case SO_IPRMDATA_MSG:
1645 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1646 break;
1647 case SO_MSGLIMIT:
1648 lock_sock(sk);
1649 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1650 : iucv->msglimit; /* default */
1651 release_sock(sk);
1652 break;
1653 case SO_MSGSIZE:
1654 if (sk->sk_state == IUCV_OPEN)
1655 return -EBADFD;
1656 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1657 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1658 0x7fffffff;
1659 break;
1660 default:
1661 return -ENOPROTOOPT;
1662 }
1663
1664 if (put_user(len, optlen))
1665 return -EFAULT;
1666 if (copy_to_user(optval, &val, len))
1667 return -EFAULT;
1668
1669 return 0;
1670 }
1671
1672
1673 /* Callback wrappers - called from iucv base support */
1674 static int iucv_callback_connreq(struct iucv_path *path,
1675 u8 ipvmid[8], u8 ipuser[16])
1676 {
1677 unsigned char user_data[16];
1678 unsigned char nuser_data[16];
1679 unsigned char src_name[8];
1680 struct sock *sk, *nsk;
1681 struct iucv_sock *iucv, *niucv;
1682 int err;
1683
1684 memcpy(src_name, ipuser, 8);
1685 EBCASC(src_name, 8);
1686 /* Find out if this path belongs to af_iucv. */
1687 read_lock(&iucv_sk_list.lock);
1688 iucv = NULL;
1689 sk = NULL;
1690 sk_for_each(sk, &iucv_sk_list.head)
1691 if (sk->sk_state == IUCV_LISTEN &&
1692 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1693 /*
1694 * Found a listening socket with
1695 * src_name == ipuser[0-7].
1696 */
1697 iucv = iucv_sk(sk);
1698 break;
1699 }
1700 read_unlock(&iucv_sk_list.lock);
1701 if (!iucv)
1702 /* No socket found, not one of our paths. */
1703 return -EINVAL;
1704
1705 bh_lock_sock(sk);
1706
1707 /* Check if parent socket is listening */
1708 low_nmcpy(user_data, iucv->src_name);
1709 high_nmcpy(user_data, iucv->dst_name);
1710 ASCEBC(user_data, sizeof(user_data));
1711 if (sk->sk_state != IUCV_LISTEN) {
1712 err = pr_iucv->path_sever(path, user_data);
1713 iucv_path_free(path);
1714 goto fail;
1715 }
1716
1717 /* Check for backlog size */
1718 if (sk_acceptq_is_full(sk)) {
1719 err = pr_iucv->path_sever(path, user_data);
1720 iucv_path_free(path);
1721 goto fail;
1722 }
1723
1724 /* Create the new socket */
1725 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1726 if (!nsk) {
1727 err = pr_iucv->path_sever(path, user_data);
1728 iucv_path_free(path);
1729 goto fail;
1730 }
1731
1732 niucv = iucv_sk(nsk);
1733 iucv_sock_init(nsk, sk);
1734
1735 /* Set the new iucv_sock */
1736 memcpy(niucv->dst_name, ipuser + 8, 8);
1737 EBCASC(niucv->dst_name, 8);
1738 memcpy(niucv->dst_user_id, ipvmid, 8);
1739 memcpy(niucv->src_name, iucv->src_name, 8);
1740 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1741 niucv->path = path;
1742
1743 /* Call iucv_accept */
1744 high_nmcpy(nuser_data, ipuser + 8);
1745 memcpy(nuser_data + 8, niucv->src_name, 8);
1746 ASCEBC(nuser_data + 8, 8);
1747
1748 /* set message limit for path based on msglimit of accepting socket */
1749 niucv->msglimit = iucv->msglimit;
1750 path->msglim = iucv->msglimit;
1751 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1752 if (err) {
1753 iucv_sever_path(nsk, 1);
1754 iucv_sock_kill(nsk);
1755 goto fail;
1756 }
1757
1758 iucv_accept_enqueue(sk, nsk);
1759
1760 /* Wake up accept */
1761 nsk->sk_state = IUCV_CONNECTED;
1762 sk->sk_data_ready(sk);
1763 err = 0;
1764 fail:
1765 bh_unlock_sock(sk);
1766 return 0;
1767 }
1768
1769 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1770 {
1771 struct sock *sk = path->private;
1772
1773 sk->sk_state = IUCV_CONNECTED;
1774 sk->sk_state_change(sk);
1775 }
1776
1777 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1778 {
1779 struct sock *sk = path->private;
1780 struct iucv_sock *iucv = iucv_sk(sk);
1781 struct sk_buff *skb;
1782 struct sock_msg_q *save_msg;
1783 int len;
1784
1785 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1786 pr_iucv->message_reject(path, msg);
1787 return;
1788 }
1789
1790 spin_lock(&iucv->message_q.lock);
1791
1792 if (!list_empty(&iucv->message_q.list) ||
1793 !skb_queue_empty(&iucv->backlog_skb_q))
1794 goto save_message;
1795
1796 len = atomic_read(&sk->sk_rmem_alloc);
1797 len += SKB_TRUESIZE(iucv_msg_length(msg));
1798 if (len > sk->sk_rcvbuf)
1799 goto save_message;
1800
1801 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1802 if (!skb)
1803 goto save_message;
1804
1805 iucv_process_message(sk, skb, path, msg);
1806 goto out_unlock;
1807
1808 save_message:
1809 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1810 if (!save_msg)
1811 goto out_unlock;
1812 save_msg->path = path;
1813 save_msg->msg = *msg;
1814
1815 list_add_tail(&save_msg->list, &iucv->message_q.list);
1816
1817 out_unlock:
1818 spin_unlock(&iucv->message_q.lock);
1819 }
1820
1821 static void iucv_callback_txdone(struct iucv_path *path,
1822 struct iucv_message *msg)
1823 {
1824 struct sock *sk = path->private;
1825 struct sk_buff *this = NULL;
1826 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1827 struct sk_buff *list_skb = list->next;
1828 unsigned long flags;
1829
1830 bh_lock_sock(sk);
1831 if (!skb_queue_empty(list)) {
1832 spin_lock_irqsave(&list->lock, flags);
1833
1834 while (list_skb != (struct sk_buff *)list) {
1835 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1836 this = list_skb;
1837 break;
1838 }
1839 list_skb = list_skb->next;
1840 }
1841 if (this)
1842 __skb_unlink(this, list);
1843
1844 spin_unlock_irqrestore(&list->lock, flags);
1845
1846 if (this) {
1847 kfree_skb(this);
1848 /* wake up any process waiting for sending */
1849 iucv_sock_wake_msglim(sk);
1850 }
1851 }
1852
1853 if (sk->sk_state == IUCV_CLOSING) {
1854 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1855 sk->sk_state = IUCV_CLOSED;
1856 sk->sk_state_change(sk);
1857 }
1858 }
1859 bh_unlock_sock(sk);
1860
1861 }
1862
1863 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1864 {
1865 struct sock *sk = path->private;
1866
1867 if (sk->sk_state == IUCV_CLOSED)
1868 return;
1869
1870 bh_lock_sock(sk);
1871 iucv_sever_path(sk, 1);
1872 sk->sk_state = IUCV_DISCONN;
1873
1874 sk->sk_state_change(sk);
1875 bh_unlock_sock(sk);
1876 }
1877
1878 /* called if the other communication side shuts down its RECV direction;
1879 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1880 */
1881 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1882 {
1883 struct sock *sk = path->private;
1884
1885 bh_lock_sock(sk);
1886 if (sk->sk_state != IUCV_CLOSED) {
1887 sk->sk_shutdown |= SEND_SHUTDOWN;
1888 sk->sk_state_change(sk);
1889 }
1890 bh_unlock_sock(sk);
1891 }
1892
1893 /***************** HiperSockets transport callbacks ********************/
1894 static void afiucv_swap_src_dest(struct sk_buff *skb)
1895 {
1896 struct af_iucv_trans_hdr *trans_hdr =
1897 (struct af_iucv_trans_hdr *)skb->data;
1898 char tmpID[8];
1899 char tmpName[8];
1900
1901 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1902 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1903 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1904 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1905 memcpy(tmpID, trans_hdr->srcUserID, 8);
1906 memcpy(tmpName, trans_hdr->srcAppName, 8);
1907 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1908 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1909 memcpy(trans_hdr->destUserID, tmpID, 8);
1910 memcpy(trans_hdr->destAppName, tmpName, 8);
1911 skb_push(skb, ETH_HLEN);
1912 memset(skb->data, 0, ETH_HLEN);
1913 }
1914
1915 /**
1916 * afiucv_hs_callback_syn - react on received SYN
1917 **/
1918 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1919 {
1920 struct sock *nsk;
1921 struct iucv_sock *iucv, *niucv;
1922 struct af_iucv_trans_hdr *trans_hdr;
1923 int err;
1924
1925 iucv = iucv_sk(sk);
1926 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1927 if (!iucv) {
1928 /* no sock - connection refused */
1929 afiucv_swap_src_dest(skb);
1930 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1931 err = dev_queue_xmit(skb);
1932 goto out;
1933 }
1934
1935 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1936 bh_lock_sock(sk);
1937 if ((sk->sk_state != IUCV_LISTEN) ||
1938 sk_acceptq_is_full(sk) ||
1939 !nsk) {
1940 /* error on server socket - connection refused */
1941 afiucv_swap_src_dest(skb);
1942 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1943 err = dev_queue_xmit(skb);
1944 iucv_sock_kill(nsk);
1945 bh_unlock_sock(sk);
1946 goto out;
1947 }
1948
1949 niucv = iucv_sk(nsk);
1950 iucv_sock_init(nsk, sk);
1951 niucv->transport = AF_IUCV_TRANS_HIPER;
1952 niucv->msglimit = iucv->msglimit;
1953 if (!trans_hdr->window)
1954 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1955 else
1956 niucv->msglimit_peer = trans_hdr->window;
1957 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1958 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1959 memcpy(niucv->src_name, iucv->src_name, 8);
1960 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1961 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1962 niucv->hs_dev = iucv->hs_dev;
1963 dev_hold(niucv->hs_dev);
1964 afiucv_swap_src_dest(skb);
1965 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1966 trans_hdr->window = niucv->msglimit;
1967 /* if receiver acks the xmit connection is established */
1968 err = dev_queue_xmit(skb);
1969 if (!err) {
1970 iucv_accept_enqueue(sk, nsk);
1971 nsk->sk_state = IUCV_CONNECTED;
1972 sk->sk_data_ready(sk);
1973 } else
1974 iucv_sock_kill(nsk);
1975 bh_unlock_sock(sk);
1976
1977 out:
1978 return NET_RX_SUCCESS;
1979 }
1980
1981 /**
1982 * afiucv_hs_callback_synack() - react on received SYN-ACK
1983 **/
1984 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1985 {
1986 struct iucv_sock *iucv = iucv_sk(sk);
1987 struct af_iucv_trans_hdr *trans_hdr =
1988 (struct af_iucv_trans_hdr *)skb->data;
1989
1990 if (!iucv)
1991 goto out;
1992 if (sk->sk_state != IUCV_BOUND)
1993 goto out;
1994 bh_lock_sock(sk);
1995 iucv->msglimit_peer = trans_hdr->window;
1996 sk->sk_state = IUCV_CONNECTED;
1997 sk->sk_state_change(sk);
1998 bh_unlock_sock(sk);
1999 out:
2000 kfree_skb(skb);
2001 return NET_RX_SUCCESS;
2002 }
2003
2004 /**
2005 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2006 **/
2007 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2008 {
2009 struct iucv_sock *iucv = iucv_sk(sk);
2010
2011 if (!iucv)
2012 goto out;
2013 if (sk->sk_state != IUCV_BOUND)
2014 goto out;
2015 bh_lock_sock(sk);
2016 sk->sk_state = IUCV_DISCONN;
2017 sk->sk_state_change(sk);
2018 bh_unlock_sock(sk);
2019 out:
2020 kfree_skb(skb);
2021 return NET_RX_SUCCESS;
2022 }
2023
2024 /**
2025 * afiucv_hs_callback_fin() - react on received FIN
2026 **/
2027 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2028 {
2029 struct iucv_sock *iucv = iucv_sk(sk);
2030
2031 /* other end of connection closed */
2032 if (!iucv)
2033 goto out;
2034 bh_lock_sock(sk);
2035 if (sk->sk_state == IUCV_CONNECTED) {
2036 sk->sk_state = IUCV_DISCONN;
2037 sk->sk_state_change(sk);
2038 }
2039 bh_unlock_sock(sk);
2040 out:
2041 kfree_skb(skb);
2042 return NET_RX_SUCCESS;
2043 }
2044
2045 /**
2046 * afiucv_hs_callback_win() - react on received WIN
2047 **/
2048 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2049 {
2050 struct iucv_sock *iucv = iucv_sk(sk);
2051 struct af_iucv_trans_hdr *trans_hdr =
2052 (struct af_iucv_trans_hdr *)skb->data;
2053
2054 if (!iucv)
2055 return NET_RX_SUCCESS;
2056
2057 if (sk->sk_state != IUCV_CONNECTED)
2058 return NET_RX_SUCCESS;
2059
2060 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2061 iucv_sock_wake_msglim(sk);
2062 return NET_RX_SUCCESS;
2063 }
2064
2065 /**
2066 * afiucv_hs_callback_rx() - react on received data
2067 **/
2068 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2069 {
2070 struct iucv_sock *iucv = iucv_sk(sk);
2071
2072 if (!iucv) {
2073 kfree_skb(skb);
2074 return NET_RX_SUCCESS;
2075 }
2076
2077 if (sk->sk_state != IUCV_CONNECTED) {
2078 kfree_skb(skb);
2079 return NET_RX_SUCCESS;
2080 }
2081
2082 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2083 kfree_skb(skb);
2084 return NET_RX_SUCCESS;
2085 }
2086
2087 /* write stuff from iucv_msg to skb cb */
2088 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2089 kfree_skb(skb);
2090 return NET_RX_SUCCESS;
2091 }
2092 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2093 skb_reset_transport_header(skb);
2094 skb_reset_network_header(skb);
2095 IUCV_SKB_CB(skb)->offset = 0;
2096 spin_lock(&iucv->message_q.lock);
2097 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2098 if (sock_queue_rcv_skb(sk, skb)) {
2099 /* handle rcv queue full */
2100 skb_queue_tail(&iucv->backlog_skb_q, skb);
2101 }
2102 } else
2103 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2104 spin_unlock(&iucv->message_q.lock);
2105 return NET_RX_SUCCESS;
2106 }
2107
2108 /**
2109 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2110 * transport
2111 * called from netif RX softirq
2112 **/
2113 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2114 struct packet_type *pt, struct net_device *orig_dev)
2115 {
2116 struct sock *sk;
2117 struct iucv_sock *iucv;
2118 struct af_iucv_trans_hdr *trans_hdr;
2119 char nullstring[8];
2120 int err = 0;
2121
2122 skb_pull(skb, ETH_HLEN);
2123 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2124 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2125 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2126 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2127 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2128 memset(nullstring, 0, sizeof(nullstring));
2129 iucv = NULL;
2130 sk = NULL;
2131 read_lock(&iucv_sk_list.lock);
2132 sk_for_each(sk, &iucv_sk_list.head) {
2133 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2134 if ((!memcmp(&iucv_sk(sk)->src_name,
2135 trans_hdr->destAppName, 8)) &&
2136 (!memcmp(&iucv_sk(sk)->src_user_id,
2137 trans_hdr->destUserID, 8)) &&
2138 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2139 (!memcmp(&iucv_sk(sk)->dst_user_id,
2140 nullstring, 8))) {
2141 iucv = iucv_sk(sk);
2142 break;
2143 }
2144 } else {
2145 if ((!memcmp(&iucv_sk(sk)->src_name,
2146 trans_hdr->destAppName, 8)) &&
2147 (!memcmp(&iucv_sk(sk)->src_user_id,
2148 trans_hdr->destUserID, 8)) &&
2149 (!memcmp(&iucv_sk(sk)->dst_name,
2150 trans_hdr->srcAppName, 8)) &&
2151 (!memcmp(&iucv_sk(sk)->dst_user_id,
2152 trans_hdr->srcUserID, 8))) {
2153 iucv = iucv_sk(sk);
2154 break;
2155 }
2156 }
2157 }
2158 read_unlock(&iucv_sk_list.lock);
2159 if (!iucv)
2160 sk = NULL;
2161
2162 /* no sock
2163 how should we send with no sock
2164 1) send without sock no send rc checking?
2165 2) introduce default sock to handle this cases
2166
2167 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2168 data -> send FIN
2169 SYN|ACK, SYN|FIN, FIN -> no action? */
2170
2171 switch (trans_hdr->flags) {
2172 case AF_IUCV_FLAG_SYN:
2173 /* connect request */
2174 err = afiucv_hs_callback_syn(sk, skb);
2175 break;
2176 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2177 /* connect request confirmed */
2178 err = afiucv_hs_callback_synack(sk, skb);
2179 break;
2180 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2181 /* connect request refused */
2182 err = afiucv_hs_callback_synfin(sk, skb);
2183 break;
2184 case (AF_IUCV_FLAG_FIN):
2185 /* close request */
2186 err = afiucv_hs_callback_fin(sk, skb);
2187 break;
2188 case (AF_IUCV_FLAG_WIN):
2189 err = afiucv_hs_callback_win(sk, skb);
2190 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2191 kfree_skb(skb);
2192 break;
2193 }
2194 /* fall through and receive non-zero length data */
2195 case (AF_IUCV_FLAG_SHT):
2196 /* shutdown request */
2197 /* fall through and receive zero length data */
2198 case 0:
2199 /* plain data frame */
2200 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2201 err = afiucv_hs_callback_rx(sk, skb);
2202 break;
2203 default:
2204 ;
2205 }
2206
2207 return err;
2208 }
2209
2210 /**
2211 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2212 * transport
2213 **/
2214 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2215 enum iucv_tx_notify n)
2216 {
2217 struct sock *isk = skb->sk;
2218 struct sock *sk = NULL;
2219 struct iucv_sock *iucv = NULL;
2220 struct sk_buff_head *list;
2221 struct sk_buff *list_skb;
2222 struct sk_buff *nskb;
2223 unsigned long flags;
2224
2225 read_lock_irqsave(&iucv_sk_list.lock, flags);
2226 sk_for_each(sk, &iucv_sk_list.head)
2227 if (sk == isk) {
2228 iucv = iucv_sk(sk);
2229 break;
2230 }
2231 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2232
2233 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2234 return;
2235
2236 list = &iucv->send_skb_q;
2237 spin_lock_irqsave(&list->lock, flags);
2238 if (skb_queue_empty(list))
2239 goto out_unlock;
2240 list_skb = list->next;
2241 nskb = list_skb->next;
2242 while (list_skb != (struct sk_buff *)list) {
2243 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2244 switch (n) {
2245 case TX_NOTIFY_OK:
2246 __skb_unlink(list_skb, list);
2247 kfree_skb(list_skb);
2248 iucv_sock_wake_msglim(sk);
2249 break;
2250 case TX_NOTIFY_PENDING:
2251 atomic_inc(&iucv->pendings);
2252 break;
2253 case TX_NOTIFY_DELAYED_OK:
2254 __skb_unlink(list_skb, list);
2255 atomic_dec(&iucv->pendings);
2256 if (atomic_read(&iucv->pendings) <= 0)
2257 iucv_sock_wake_msglim(sk);
2258 kfree_skb(list_skb);
2259 break;
2260 case TX_NOTIFY_UNREACHABLE:
2261 case TX_NOTIFY_DELAYED_UNREACHABLE:
2262 case TX_NOTIFY_TPQFULL: /* not yet used */
2263 case TX_NOTIFY_GENERALERROR:
2264 case TX_NOTIFY_DELAYED_GENERALERROR:
2265 __skb_unlink(list_skb, list);
2266 kfree_skb(list_skb);
2267 if (sk->sk_state == IUCV_CONNECTED) {
2268 sk->sk_state = IUCV_DISCONN;
2269 sk->sk_state_change(sk);
2270 }
2271 break;
2272 }
2273 break;
2274 }
2275 list_skb = nskb;
2276 nskb = nskb->next;
2277 }
2278 out_unlock:
2279 spin_unlock_irqrestore(&list->lock, flags);
2280
2281 if (sk->sk_state == IUCV_CLOSING) {
2282 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2283 sk->sk_state = IUCV_CLOSED;
2284 sk->sk_state_change(sk);
2285 }
2286 }
2287
2288 }
2289
2290 /*
2291 * afiucv_netdev_event: handle netdev notifier chain events
2292 */
2293 static int afiucv_netdev_event(struct notifier_block *this,
2294 unsigned long event, void *ptr)
2295 {
2296 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2297 struct sock *sk;
2298 struct iucv_sock *iucv;
2299
2300 switch (event) {
2301 case NETDEV_REBOOT:
2302 case NETDEV_GOING_DOWN:
2303 sk_for_each(sk, &iucv_sk_list.head) {
2304 iucv = iucv_sk(sk);
2305 if ((iucv->hs_dev == event_dev) &&
2306 (sk->sk_state == IUCV_CONNECTED)) {
2307 if (event == NETDEV_GOING_DOWN)
2308 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2309 sk->sk_state = IUCV_DISCONN;
2310 sk->sk_state_change(sk);
2311 }
2312 }
2313 break;
2314 case NETDEV_DOWN:
2315 case NETDEV_UNREGISTER:
2316 default:
2317 break;
2318 }
2319 return NOTIFY_DONE;
2320 }
2321
2322 static struct notifier_block afiucv_netdev_notifier = {
2323 .notifier_call = afiucv_netdev_event,
2324 };
2325
2326 static const struct proto_ops iucv_sock_ops = {
2327 .family = PF_IUCV,
2328 .owner = THIS_MODULE,
2329 .release = iucv_sock_release,
2330 .bind = iucv_sock_bind,
2331 .connect = iucv_sock_connect,
2332 .listen = iucv_sock_listen,
2333 .accept = iucv_sock_accept,
2334 .getname = iucv_sock_getname,
2335 .sendmsg = iucv_sock_sendmsg,
2336 .recvmsg = iucv_sock_recvmsg,
2337 .poll = iucv_sock_poll,
2338 .ioctl = sock_no_ioctl,
2339 .mmap = sock_no_mmap,
2340 .socketpair = sock_no_socketpair,
2341 .shutdown = iucv_sock_shutdown,
2342 .setsockopt = iucv_sock_setsockopt,
2343 .getsockopt = iucv_sock_getsockopt,
2344 };
2345
2346 static const struct net_proto_family iucv_sock_family_ops = {
2347 .family = AF_IUCV,
2348 .owner = THIS_MODULE,
2349 .create = iucv_sock_create,
2350 };
2351
2352 static struct packet_type iucv_packet_type = {
2353 .type = cpu_to_be16(ETH_P_AF_IUCV),
2354 .func = afiucv_hs_rcv,
2355 };
2356
2357 static int afiucv_iucv_init(void)
2358 {
2359 int err;
2360
2361 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2362 if (err)
2363 goto out;
2364 /* establish dummy device */
2365 af_iucv_driver.bus = pr_iucv->bus;
2366 err = driver_register(&af_iucv_driver);
2367 if (err)
2368 goto out_iucv;
2369 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2370 if (!af_iucv_dev) {
2371 err = -ENOMEM;
2372 goto out_driver;
2373 }
2374 dev_set_name(af_iucv_dev, "af_iucv");
2375 af_iucv_dev->bus = pr_iucv->bus;
2376 af_iucv_dev->parent = pr_iucv->root;
2377 af_iucv_dev->release = (void (*)(struct device *))kfree;
2378 af_iucv_dev->driver = &af_iucv_driver;
2379 err = device_register(af_iucv_dev);
2380 if (err)
2381 goto out_driver;
2382 return 0;
2383
2384 out_driver:
2385 driver_unregister(&af_iucv_driver);
2386 out_iucv:
2387 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2388 out:
2389 return err;
2390 }
2391
2392 static int __init afiucv_init(void)
2393 {
2394 int err;
2395
2396 if (MACHINE_IS_VM) {
2397 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2398 if (unlikely(err)) {
2399 WARN_ON(err);
2400 err = -EPROTONOSUPPORT;
2401 goto out;
2402 }
2403
2404 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2405 if (!pr_iucv) {
2406 printk(KERN_WARNING "iucv_if lookup failed\n");
2407 memset(&iucv_userid, 0, sizeof(iucv_userid));
2408 }
2409 } else {
2410 memset(&iucv_userid, 0, sizeof(iucv_userid));
2411 pr_iucv = NULL;
2412 }
2413
2414 err = proto_register(&iucv_proto, 0);
2415 if (err)
2416 goto out;
2417 err = sock_register(&iucv_sock_family_ops);
2418 if (err)
2419 goto out_proto;
2420
2421 if (pr_iucv) {
2422 err = afiucv_iucv_init();
2423 if (err)
2424 goto out_sock;
2425 } else
2426 register_netdevice_notifier(&afiucv_netdev_notifier);
2427 dev_add_pack(&iucv_packet_type);
2428 return 0;
2429
2430 out_sock:
2431 sock_unregister(PF_IUCV);
2432 out_proto:
2433 proto_unregister(&iucv_proto);
2434 out:
2435 if (pr_iucv)
2436 symbol_put(iucv_if);
2437 return err;
2438 }
2439
2440 static void __exit afiucv_exit(void)
2441 {
2442 if (pr_iucv) {
2443 device_unregister(af_iucv_dev);
2444 driver_unregister(&af_iucv_driver);
2445 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2446 symbol_put(iucv_if);
2447 } else
2448 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2449 dev_remove_pack(&iucv_packet_type);
2450 sock_unregister(PF_IUCV);
2451 proto_unregister(&iucv_proto);
2452 }
2453
2454 module_init(afiucv_init);
2455 module_exit(afiucv_exit);
2456
2457 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2458 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2459 MODULE_VERSION(VERSION);
2460 MODULE_LICENSE("GPL");
2461 MODULE_ALIAS_NETPROTO(PF_IUCV);
2462
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