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jme: Fix device PM wakeup API usage
[linux/fpc-iii.git] / net / iucv / af_iucv.c
blobf521848e26c76f4cffecc77012ef98e940c176a9
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 ipuser[16]);
99 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
100 u8 ipuser[16]);
101 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
103
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
107 };
108
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
116 };
117
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120 memcpy(dst, src, 8);
121 }
122
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(&dst[8], src, 8);
126 }
127
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133 return 0;
134 }
135
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142
143 /**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151 struct iucv_sock *iucv;
152 struct sock *sk;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 switch (sk->sk_state) {
162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
165 iucv_sever_path(sk, 0);
166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179 }
180
181 /**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189 struct sock *sk;
190
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213 }
214
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221 };
222
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
226 .bus = NULL,
227 .pm = &afiucv_pm_ops,
228 };
229
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232
233 /**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
245 * The socket data length is computed by subtracting the socket data length
246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262 }
263
264 /**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274 return (sk->sk_state == state || sk->sk_state == state2);
275 }
276
277 /**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
296 }
297
298 /**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
307 if (wq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310 rcu_read_unlock();
311 }
312
313 /**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318 {
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
341 if (confirm_recv)
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 }
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 if (imsg)
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354
355 skb->dev = iucv->hs_dev;
356 if (!skb->dev)
357 return -ENODEV;
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
359 return -ENETDOWN;
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
362 return -EMSGSIZE;
363 else
364 skb_trim(skb, skb->dev->mtu);
365 }
366 skb->protocol = ETH_P_AF_IUCV;
367 nskb = skb_clone(skb, GFP_ATOMIC);
368 if (!nskb)
369 return -ENOMEM;
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
372 if (net_xmit_eval(err)) {
373 skb_unlink(nskb, &iucv->send_skb_q);
374 kfree_skb(nskb);
375 } else {
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 }
379 return net_xmit_eval(err);
380 }
381
382 static struct sock *__iucv_get_sock_by_name(char *nm)
383 {
384 struct sock *sk;
385
386 sk_for_each(sk, &iucv_sk_list.head)
387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
388 return sk;
389
390 return NULL;
391 }
392
393 static void iucv_sock_destruct(struct sock *sk)
394 {
395 skb_queue_purge(&sk->sk_receive_queue);
396 skb_queue_purge(&sk->sk_error_queue);
397
398 sk_mem_reclaim(sk);
399
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
402 return;
403 }
404
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
409 }
410
411 /* Cleanup Listen */
412 static void iucv_sock_cleanup_listen(struct sock *parent)
413 {
414 struct sock *sk;
415
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
418 iucv_sock_close(sk);
419 iucv_sock_kill(sk);
420 }
421
422 parent->sk_state = IUCV_CLOSED;
423 }
424
425 /* Kill socket (only if zapped and orphaned) */
426 static void iucv_sock_kill(struct sock *sk)
427 {
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
429 return;
430
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
433 sock_put(sk);
434 }
435
436 /* Terminate an IUCV path */
437 static void iucv_sever_path(struct sock *sk, int with_user_data)
438 {
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
442
443 if (iucv->path) {
444 iucv->path = NULL;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
450 } else
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
453 }
454 }
455
456 /* Send FIN through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
458 {
459 int err = 0;
460 int blen;
461 struct sk_buff *skb;
462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 skb = sock_alloc_send_skb(sk, blen, 1, &err);
465 if (skb) {
466 skb_reserve(skb, blen);
467 err = afiucv_hs_send(NULL, sk, skb, flags);
468 }
469 return err;
470 }
471
472 /* Close an IUCV socket */
473 static void iucv_sock_close(struct sock *sk)
474 {
475 struct iucv_sock *iucv = iucv_sk(sk);
476 unsigned long timeo;
477 int err = 0;
478
479 lock_sock(sk);
480
481 switch (sk->sk_state) {
482 case IUCV_LISTEN:
483 iucv_sock_cleanup_listen(sk);
484 break;
485
486 case IUCV_CONNECTED:
487 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
489 sk->sk_state = IUCV_DISCONN;
490 sk->sk_state_change(sk);
491 }
492 case IUCV_DISCONN: /* fall through */
493 sk->sk_state = IUCV_CLOSING;
494 sk->sk_state_change(sk);
495
496 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
498 timeo = sk->sk_lingertime;
499 else
500 timeo = IUCV_DISCONN_TIMEOUT;
501 iucv_sock_wait(sk,
502 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
503 timeo);
504 }
505
506 case IUCV_CLOSING: /* fall through */
507 sk->sk_state = IUCV_CLOSED;
508 sk->sk_state_change(sk);
509
510 sk->sk_err = ECONNRESET;
511 sk->sk_state_change(sk);
512
513 skb_queue_purge(&iucv->send_skb_q);
514 skb_queue_purge(&iucv->backlog_skb_q);
515
516 default: /* fall through */
517 iucv_sever_path(sk, 1);
518 }
519
520 if (iucv->hs_dev) {
521 dev_put(iucv->hs_dev);
522 iucv->hs_dev = NULL;
523 sk->sk_bound_dev_if = 0;
524 }
525
526 /* mark socket for deletion by iucv_sock_kill() */
527 sock_set_flag(sk, SOCK_ZAPPED);
528
529 release_sock(sk);
530 }
531
532 static void iucv_sock_init(struct sock *sk, struct sock *parent)
533 {
534 if (parent)
535 sk->sk_type = parent->sk_type;
536 }
537
538 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
539 {
540 struct sock *sk;
541 struct iucv_sock *iucv;
542
543 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
544 if (!sk)
545 return NULL;
546 iucv = iucv_sk(sk);
547
548 sock_init_data(sock, sk);
549 INIT_LIST_HEAD(&iucv->accept_q);
550 spin_lock_init(&iucv->accept_q_lock);
551 skb_queue_head_init(&iucv->send_skb_q);
552 INIT_LIST_HEAD(&iucv->message_q.list);
553 spin_lock_init(&iucv->message_q.lock);
554 skb_queue_head_init(&iucv->backlog_skb_q);
555 iucv->send_tag = 0;
556 atomic_set(&iucv->pendings, 0);
557 iucv->flags = 0;
558 iucv->msglimit = 0;
559 atomic_set(&iucv->msg_sent, 0);
560 atomic_set(&iucv->msg_recv, 0);
561 iucv->path = NULL;
562 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
563 memset(&iucv->src_user_id , 0, 32);
564 if (pr_iucv)
565 iucv->transport = AF_IUCV_TRANS_IUCV;
566 else
567 iucv->transport = AF_IUCV_TRANS_HIPER;
568
569 sk->sk_destruct = iucv_sock_destruct;
570 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
571 sk->sk_allocation = GFP_DMA;
572
573 sock_reset_flag(sk, SOCK_ZAPPED);
574
575 sk->sk_protocol = proto;
576 sk->sk_state = IUCV_OPEN;
577
578 iucv_sock_link(&iucv_sk_list, sk);
579 return sk;
580 }
581
582 /* Create an IUCV socket */
583 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
584 int kern)
585 {
586 struct sock *sk;
587
588 if (protocol && protocol != PF_IUCV)
589 return -EPROTONOSUPPORT;
590
591 sock->state = SS_UNCONNECTED;
592
593 switch (sock->type) {
594 case SOCK_STREAM:
595 sock->ops = &iucv_sock_ops;
596 break;
597 case SOCK_SEQPACKET:
598 /* currently, proto ops can handle both sk types */
599 sock->ops = &iucv_sock_ops;
600 break;
601 default:
602 return -ESOCKTNOSUPPORT;
603 }
604
605 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
606 if (!sk)
607 return -ENOMEM;
608
609 iucv_sock_init(sk, NULL);
610
611 return 0;
612 }
613
614 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
615 {
616 write_lock_bh(&l->lock);
617 sk_add_node(sk, &l->head);
618 write_unlock_bh(&l->lock);
619 }
620
621 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
622 {
623 write_lock_bh(&l->lock);
624 sk_del_node_init(sk);
625 write_unlock_bh(&l->lock);
626 }
627
628 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
629 {
630 unsigned long flags;
631 struct iucv_sock *par = iucv_sk(parent);
632
633 sock_hold(sk);
634 spin_lock_irqsave(&par->accept_q_lock, flags);
635 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
636 spin_unlock_irqrestore(&par->accept_q_lock, flags);
637 iucv_sk(sk)->parent = parent;
638 sk_acceptq_added(parent);
639 }
640
641 void iucv_accept_unlink(struct sock *sk)
642 {
643 unsigned long flags;
644 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
645
646 spin_lock_irqsave(&par->accept_q_lock, flags);
647 list_del_init(&iucv_sk(sk)->accept_q);
648 spin_unlock_irqrestore(&par->accept_q_lock, flags);
649 sk_acceptq_removed(iucv_sk(sk)->parent);
650 iucv_sk(sk)->parent = NULL;
651 sock_put(sk);
652 }
653
654 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
655 {
656 struct iucv_sock *isk, *n;
657 struct sock *sk;
658
659 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
660 sk = (struct sock *) isk;
661 lock_sock(sk);
662
663 if (sk->sk_state == IUCV_CLOSED) {
664 iucv_accept_unlink(sk);
665 release_sock(sk);
666 continue;
667 }
668
669 if (sk->sk_state == IUCV_CONNECTED ||
670 sk->sk_state == IUCV_DISCONN ||
671 !newsock) {
672 iucv_accept_unlink(sk);
673 if (newsock)
674 sock_graft(sk, newsock);
675
676 release_sock(sk);
677 return sk;
678 }
679
680 release_sock(sk);
681 }
682 return NULL;
683 }
684
685 static void __iucv_auto_name(struct iucv_sock *iucv)
686 {
687 char name[12];
688
689 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
690 while (__iucv_get_sock_by_name(name)) {
691 sprintf(name, "%08x",
692 atomic_inc_return(&iucv_sk_list.autobind_name));
693 }
694 memcpy(iucv->src_name, name, 8);
695 }
696
697 /* Bind an unbound socket */
698 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
699 int addr_len)
700 {
701 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
702 struct sock *sk = sock->sk;
703 struct iucv_sock *iucv;
704 int err = 0;
705 struct net_device *dev;
706 char uid[9];
707
708 /* Verify the input sockaddr */
709 if (!addr || addr->sa_family != AF_IUCV)
710 return -EINVAL;
711
712 if (addr_len < sizeof(struct sockaddr_iucv))
713 return -EINVAL;
714
715 lock_sock(sk);
716 if (sk->sk_state != IUCV_OPEN) {
717 err = -EBADFD;
718 goto done;
719 }
720
721 write_lock_bh(&iucv_sk_list.lock);
722
723 iucv = iucv_sk(sk);
724 if (__iucv_get_sock_by_name(sa->siucv_name)) {
725 err = -EADDRINUSE;
726 goto done_unlock;
727 }
728 if (iucv->path)
729 goto done_unlock;
730
731 /* Bind the socket */
732 if (pr_iucv)
733 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
734 goto vm_bind; /* VM IUCV transport */
735
736 /* try hiper transport */
737 memcpy(uid, sa->siucv_user_id, sizeof(uid));
738 ASCEBC(uid, 8);
739 rcu_read_lock();
740 for_each_netdev_rcu(&init_net, dev) {
741 if (!memcmp(dev->perm_addr, uid, 8)) {
742 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
743 /* Check for unitialized siucv_name */
744 if (strncmp(sa->siucv_name, " ", 8) == 0)
745 __iucv_auto_name(iucv);
746 else
747 memcpy(iucv->src_name, sa->siucv_name, 8);
748 sk->sk_bound_dev_if = dev->ifindex;
749 iucv->hs_dev = dev;
750 dev_hold(dev);
751 sk->sk_state = IUCV_BOUND;
752 iucv->transport = AF_IUCV_TRANS_HIPER;
753 if (!iucv->msglimit)
754 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
755 rcu_read_unlock();
756 goto done_unlock;
757 }
758 }
759 rcu_read_unlock();
760 vm_bind:
761 if (pr_iucv) {
762 /* use local userid for backward compat */
763 memcpy(iucv->src_name, sa->siucv_name, 8);
764 memcpy(iucv->src_user_id, iucv_userid, 8);
765 sk->sk_state = IUCV_BOUND;
766 iucv->transport = AF_IUCV_TRANS_IUCV;
767 if (!iucv->msglimit)
768 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
769 goto done_unlock;
770 }
771 /* found no dev to bind */
772 err = -ENODEV;
773 done_unlock:
774 /* Release the socket list lock */
775 write_unlock_bh(&iucv_sk_list.lock);
776 done:
777 release_sock(sk);
778 return err;
779 }
780
781 /* Automatically bind an unbound socket */
782 static int iucv_sock_autobind(struct sock *sk)
783 {
784 struct iucv_sock *iucv = iucv_sk(sk);
785 int err = 0;
786
787 if (unlikely(!pr_iucv))
788 return -EPROTO;
789
790 memcpy(iucv->src_user_id, iucv_userid, 8);
791
792 write_lock_bh(&iucv_sk_list.lock);
793 __iucv_auto_name(iucv);
794 write_unlock_bh(&iucv_sk_list.lock);
795
796 if (!iucv->msglimit)
797 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
798
799 return err;
800 }
801
802 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
803 {
804 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
805 struct sock *sk = sock->sk;
806 struct iucv_sock *iucv = iucv_sk(sk);
807 unsigned char user_data[16];
808 int err;
809
810 high_nmcpy(user_data, sa->siucv_name);
811 low_nmcpy(user_data, iucv->src_name);
812 ASCEBC(user_data, sizeof(user_data));
813
814 /* Create path. */
815 iucv->path = iucv_path_alloc(iucv->msglimit,
816 IUCV_IPRMDATA, GFP_KERNEL);
817 if (!iucv->path) {
818 err = -ENOMEM;
819 goto done;
820 }
821 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
822 sa->siucv_user_id, NULL, user_data,
823 sk);
824 if (err) {
825 iucv_path_free(iucv->path);
826 iucv->path = NULL;
827 switch (err) {
828 case 0x0b: /* Target communicator is not logged on */
829 err = -ENETUNREACH;
830 break;
831 case 0x0d: /* Max connections for this guest exceeded */
832 case 0x0e: /* Max connections for target guest exceeded */
833 err = -EAGAIN;
834 break;
835 case 0x0f: /* Missing IUCV authorization */
836 err = -EACCES;
837 break;
838 default:
839 err = -ECONNREFUSED;
840 break;
841 }
842 }
843 done:
844 return err;
845 }
846
847 /* Connect an unconnected socket */
848 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
849 int alen, int flags)
850 {
851 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
852 struct sock *sk = sock->sk;
853 struct iucv_sock *iucv = iucv_sk(sk);
854 int err;
855
856 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
857 return -EINVAL;
858
859 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
860 return -EBADFD;
861
862 if (sk->sk_state == IUCV_OPEN &&
863 iucv->transport == AF_IUCV_TRANS_HIPER)
864 return -EBADFD; /* explicit bind required */
865
866 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
867 return -EINVAL;
868
869 if (sk->sk_state == IUCV_OPEN) {
870 err = iucv_sock_autobind(sk);
871 if (unlikely(err))
872 return err;
873 }
874
875 lock_sock(sk);
876
877 /* Set the destination information */
878 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
879 memcpy(iucv->dst_name, sa->siucv_name, 8);
880
881 if (iucv->transport == AF_IUCV_TRANS_HIPER)
882 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
883 else
884 err = afiucv_path_connect(sock, addr);
885 if (err)
886 goto done;
887
888 if (sk->sk_state != IUCV_CONNECTED)
889 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
890 IUCV_DISCONN),
891 sock_sndtimeo(sk, flags & O_NONBLOCK));
892
893 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
894 err = -ECONNREFUSED;
895
896 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
897 iucv_sever_path(sk, 0);
898
899 done:
900 release_sock(sk);
901 return err;
902 }
903
904 /* Move a socket into listening state. */
905 static int iucv_sock_listen(struct socket *sock, int backlog)
906 {
907 struct sock *sk = sock->sk;
908 int err;
909
910 lock_sock(sk);
911
912 err = -EINVAL;
913 if (sk->sk_state != IUCV_BOUND)
914 goto done;
915
916 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
917 goto done;
918
919 sk->sk_max_ack_backlog = backlog;
920 sk->sk_ack_backlog = 0;
921 sk->sk_state = IUCV_LISTEN;
922 err = 0;
923
924 done:
925 release_sock(sk);
926 return err;
927 }
928
929 /* Accept a pending connection */
930 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
931 int flags)
932 {
933 DECLARE_WAITQUEUE(wait, current);
934 struct sock *sk = sock->sk, *nsk;
935 long timeo;
936 int err = 0;
937
938 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
939
940 if (sk->sk_state != IUCV_LISTEN) {
941 err = -EBADFD;
942 goto done;
943 }
944
945 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
946
947 /* Wait for an incoming connection */
948 add_wait_queue_exclusive(sk_sleep(sk), &wait);
949 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
950 set_current_state(TASK_INTERRUPTIBLE);
951 if (!timeo) {
952 err = -EAGAIN;
953 break;
954 }
955
956 release_sock(sk);
957 timeo = schedule_timeout(timeo);
958 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
959
960 if (sk->sk_state != IUCV_LISTEN) {
961 err = -EBADFD;
962 break;
963 }
964
965 if (signal_pending(current)) {
966 err = sock_intr_errno(timeo);
967 break;
968 }
969 }
970
971 set_current_state(TASK_RUNNING);
972 remove_wait_queue(sk_sleep(sk), &wait);
973
974 if (err)
975 goto done;
976
977 newsock->state = SS_CONNECTED;
978
979 done:
980 release_sock(sk);
981 return err;
982 }
983
984 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
985 int *len, int peer)
986 {
987 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
988 struct sock *sk = sock->sk;
989 struct iucv_sock *iucv = iucv_sk(sk);
990
991 addr->sa_family = AF_IUCV;
992 *len = sizeof(struct sockaddr_iucv);
993
994 if (peer) {
995 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
996 memcpy(siucv->siucv_name, iucv->dst_name, 8);
997 } else {
998 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
999 memcpy(siucv->siucv_name, iucv->src_name, 8);
1000 }
1001 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1002 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1003 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1004
1005 return 0;
1006 }
1007
1008 /**
1009 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1010 * @path: IUCV path
1011 * @msg: Pointer to a struct iucv_message
1012 * @skb: The socket data to send, skb->len MUST BE <= 7
1013 *
1014 * Send the socket data in the parameter list in the iucv message
1015 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1016 * list and the socket data len at index 7 (last byte).
1017 * See also iucv_msg_length().
1018 *
1019 * Returns the error code from the iucv_message_send() call.
1020 */
1021 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1022 struct sk_buff *skb)
1023 {
1024 u8 prmdata[8];
1025
1026 memcpy(prmdata, (void *) skb->data, skb->len);
1027 prmdata[7] = 0xff - (u8) skb->len;
1028 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1029 (void *) prmdata, 8);
1030 }
1031
1032 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1033 struct msghdr *msg, size_t len)
1034 {
1035 struct sock *sk = sock->sk;
1036 struct iucv_sock *iucv = iucv_sk(sk);
1037 struct sk_buff *skb;
1038 struct iucv_message txmsg;
1039 struct cmsghdr *cmsg;
1040 int cmsg_done;
1041 long timeo;
1042 char user_id[9];
1043 char appl_id[9];
1044 int err;
1045 int noblock = msg->msg_flags & MSG_DONTWAIT;
1046
1047 err = sock_error(sk);
1048 if (err)
1049 return err;
1050
1051 if (msg->msg_flags & MSG_OOB)
1052 return -EOPNOTSUPP;
1053
1054 /* SOCK_SEQPACKET: we do not support segmented records */
1055 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1056 return -EOPNOTSUPP;
1057
1058 lock_sock(sk);
1059
1060 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1061 err = -EPIPE;
1062 goto out;
1063 }
1064
1065 /* Return if the socket is not in connected state */
1066 if (sk->sk_state != IUCV_CONNECTED) {
1067 err = -ENOTCONN;
1068 goto out;
1069 }
1070
1071 /* initialize defaults */
1072 cmsg_done = 0; /* check for duplicate headers */
1073 txmsg.class = 0;
1074
1075 /* iterate over control messages */
1076 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
1077 cmsg = CMSG_NXTHDR(msg, cmsg)) {
1078
1079 if (!CMSG_OK(msg, cmsg)) {
1080 err = -EINVAL;
1081 goto out;
1082 }
1083
1084 if (cmsg->cmsg_level != SOL_IUCV)
1085 continue;
1086
1087 if (cmsg->cmsg_type & cmsg_done) {
1088 err = -EINVAL;
1089 goto out;
1090 }
1091 cmsg_done |= cmsg->cmsg_type;
1092
1093 switch (cmsg->cmsg_type) {
1094 case SCM_IUCV_TRGCLS:
1095 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1096 err = -EINVAL;
1097 goto out;
1098 }
1099
1100 /* set iucv message target class */
1101 memcpy(&txmsg.class,
1102 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1103
1104 break;
1105
1106 default:
1107 err = -EINVAL;
1108 goto out;
1109 break;
1110 }
1111 }
1112
1113 /* allocate one skb for each iucv message:
1114 * this is fine for SOCK_SEQPACKET (unless we want to support
1115 * segmented records using the MSG_EOR flag), but
1116 * for SOCK_STREAM we might want to improve it in future */
1117 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1118 skb = sock_alloc_send_skb(sk,
1119 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1120 noblock, &err);
1121 else
1122 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1123 if (!skb) {
1124 err = -ENOMEM;
1125 goto out;
1126 }
1127 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1128 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1129 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1130 err = -EFAULT;
1131 goto fail;
1132 }
1133
1134 /* wait if outstanding messages for iucv path has reached */
1135 timeo = sock_sndtimeo(sk, noblock);
1136 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1137 if (err)
1138 goto fail;
1139
1140 /* return -ECONNRESET if the socket is no longer connected */
1141 if (sk->sk_state != IUCV_CONNECTED) {
1142 err = -ECONNRESET;
1143 goto fail;
1144 }
1145
1146 /* increment and save iucv message tag for msg_completion cbk */
1147 txmsg.tag = iucv->send_tag++;
1148 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1149
1150 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1151 atomic_inc(&iucv->msg_sent);
1152 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1153 if (err) {
1154 atomic_dec(&iucv->msg_sent);
1155 goto fail;
1156 }
1157 goto release;
1158 }
1159 skb_queue_tail(&iucv->send_skb_q, skb);
1160
1161 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1162 && skb->len <= 7) {
1163 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1164
1165 /* on success: there is no message_complete callback
1166 * for an IPRMDATA msg; remove skb from send queue */
1167 if (err == 0) {
1168 skb_unlink(skb, &iucv->send_skb_q);
1169 kfree_skb(skb);
1170 }
1171
1172 /* this error should never happen since the
1173 * IUCV_IPRMDATA path flag is set... sever path */
1174 if (err == 0x15) {
1175 pr_iucv->path_sever(iucv->path, NULL);
1176 skb_unlink(skb, &iucv->send_skb_q);
1177 err = -EPIPE;
1178 goto fail;
1179 }
1180 } else
1181 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1182 (void *) skb->data, skb->len);
1183 if (err) {
1184 if (err == 3) {
1185 user_id[8] = 0;
1186 memcpy(user_id, iucv->dst_user_id, 8);
1187 appl_id[8] = 0;
1188 memcpy(appl_id, iucv->dst_name, 8);
1189 pr_err("Application %s on z/VM guest %s"
1190 " exceeds message limit\n",
1191 appl_id, user_id);
1192 err = -EAGAIN;
1193 } else
1194 err = -EPIPE;
1195 skb_unlink(skb, &iucv->send_skb_q);
1196 goto fail;
1197 }
1198
1199 release:
1200 release_sock(sk);
1201 return len;
1202
1203 fail:
1204 kfree_skb(skb);
1205 out:
1206 release_sock(sk);
1207 return err;
1208 }
1209
1210 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1211 *
1212 * Locking: must be called with message_q.lock held
1213 */
1214 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1215 {
1216 int dataleft, size, copied = 0;
1217 struct sk_buff *nskb;
1218
1219 dataleft = len;
1220 while (dataleft) {
1221 if (dataleft >= sk->sk_rcvbuf / 4)
1222 size = sk->sk_rcvbuf / 4;
1223 else
1224 size = dataleft;
1225
1226 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1227 if (!nskb)
1228 return -ENOMEM;
1229
1230 /* copy target class to control buffer of new skb */
1231 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1232
1233 /* copy data fragment */
1234 memcpy(nskb->data, skb->data + copied, size);
1235 copied += size;
1236 dataleft -= size;
1237
1238 skb_reset_transport_header(nskb);
1239 skb_reset_network_header(nskb);
1240 nskb->len = size;
1241
1242 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1243 }
1244
1245 return 0;
1246 }
1247
1248 /* iucv_process_message() - Receive a single outstanding IUCV message
1249 *
1250 * Locking: must be called with message_q.lock held
1251 */
1252 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1253 struct iucv_path *path,
1254 struct iucv_message *msg)
1255 {
1256 int rc;
1257 unsigned int len;
1258
1259 len = iucv_msg_length(msg);
1260
1261 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1262 /* Note: the first 4 bytes are reserved for msg tag */
1263 IUCV_SKB_CB(skb)->class = msg->class;
1264
1265 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1266 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1267 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1268 skb->data = NULL;
1269 skb->len = 0;
1270 }
1271 } else {
1272 rc = pr_iucv->message_receive(path, msg,
1273 msg->flags & IUCV_IPRMDATA,
1274 skb->data, len, NULL);
1275 if (rc) {
1276 kfree_skb(skb);
1277 return;
1278 }
1279 /* we need to fragment iucv messages for SOCK_STREAM only;
1280 * for SOCK_SEQPACKET, it is only relevant if we support
1281 * record segmentation using MSG_EOR (see also recvmsg()) */
1282 if (sk->sk_type == SOCK_STREAM &&
1283 skb->truesize >= sk->sk_rcvbuf / 4) {
1284 rc = iucv_fragment_skb(sk, skb, len);
1285 kfree_skb(skb);
1286 skb = NULL;
1287 if (rc) {
1288 pr_iucv->path_sever(path, NULL);
1289 return;
1290 }
1291 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1292 } else {
1293 skb_reset_transport_header(skb);
1294 skb_reset_network_header(skb);
1295 skb->len = len;
1296 }
1297 }
1298
1299 IUCV_SKB_CB(skb)->offset = 0;
1300 if (sock_queue_rcv_skb(sk, skb))
1301 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1302 }
1303
1304 /* iucv_process_message_q() - Process outstanding IUCV messages
1305 *
1306 * Locking: must be called with message_q.lock held
1307 */
1308 static void iucv_process_message_q(struct sock *sk)
1309 {
1310 struct iucv_sock *iucv = iucv_sk(sk);
1311 struct sk_buff *skb;
1312 struct sock_msg_q *p, *n;
1313
1314 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1315 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1316 if (!skb)
1317 break;
1318 iucv_process_message(sk, skb, p->path, &p->msg);
1319 list_del(&p->list);
1320 kfree(p);
1321 if (!skb_queue_empty(&iucv->backlog_skb_q))
1322 break;
1323 }
1324 }
1325
1326 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1327 struct msghdr *msg, size_t len, int flags)
1328 {
1329 int noblock = flags & MSG_DONTWAIT;
1330 struct sock *sk = sock->sk;
1331 struct iucv_sock *iucv = iucv_sk(sk);
1332 unsigned int copied, rlen;
1333 struct sk_buff *skb, *rskb, *cskb;
1334 int err = 0;
1335 u32 offset;
1336
1337 if ((sk->sk_state == IUCV_DISCONN) &&
1338 skb_queue_empty(&iucv->backlog_skb_q) &&
1339 skb_queue_empty(&sk->sk_receive_queue) &&
1340 list_empty(&iucv->message_q.list))
1341 return 0;
1342
1343 if (flags & (MSG_OOB))
1344 return -EOPNOTSUPP;
1345
1346 /* receive/dequeue next skb:
1347 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1348 skb = skb_recv_datagram(sk, flags, noblock, &err);
1349 if (!skb) {
1350 if (sk->sk_shutdown & RCV_SHUTDOWN)
1351 return 0;
1352 return err;
1353 }
1354
1355 offset = IUCV_SKB_CB(skb)->offset;
1356 rlen = skb->len - offset; /* real length of skb */
1357 copied = min_t(unsigned int, rlen, len);
1358 if (!rlen)
1359 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1360
1361 cskb = skb;
1362 if (skb_copy_datagram_iovec(cskb, offset, msg->msg_iov, copied)) {
1363 if (!(flags & MSG_PEEK))
1364 skb_queue_head(&sk->sk_receive_queue, skb);
1365 return -EFAULT;
1366 }
1367
1368 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1369 if (sk->sk_type == SOCK_SEQPACKET) {
1370 if (copied < rlen)
1371 msg->msg_flags |= MSG_TRUNC;
1372 /* each iucv message contains a complete record */
1373 msg->msg_flags |= MSG_EOR;
1374 }
1375
1376 /* create control message to store iucv msg target class:
1377 * get the trgcls from the control buffer of the skb due to
1378 * fragmentation of original iucv message. */
1379 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1380 sizeof(IUCV_SKB_CB(skb)->class),
1381 (void *)&IUCV_SKB_CB(skb)->class);
1382 if (err) {
1383 if (!(flags & MSG_PEEK))
1384 skb_queue_head(&sk->sk_receive_queue, skb);
1385 return err;
1386 }
1387
1388 /* Mark read part of skb as used */
1389 if (!(flags & MSG_PEEK)) {
1390
1391 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1392 if (sk->sk_type == SOCK_STREAM) {
1393 if (copied < rlen) {
1394 IUCV_SKB_CB(skb)->offset = offset + copied;
1395 skb_queue_head(&sk->sk_receive_queue, skb);
1396 goto done;
1397 }
1398 }
1399
1400 kfree_skb(skb);
1401 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1402 atomic_inc(&iucv->msg_recv);
1403 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1404 WARN_ON(1);
1405 iucv_sock_close(sk);
1406 return -EFAULT;
1407 }
1408 }
1409
1410 /* Queue backlog skbs */
1411 spin_lock_bh(&iucv->message_q.lock);
1412 rskb = skb_dequeue(&iucv->backlog_skb_q);
1413 while (rskb) {
1414 IUCV_SKB_CB(rskb)->offset = 0;
1415 if (sock_queue_rcv_skb(sk, rskb)) {
1416 skb_queue_head(&iucv->backlog_skb_q,
1417 rskb);
1418 break;
1419 } else {
1420 rskb = skb_dequeue(&iucv->backlog_skb_q);
1421 }
1422 }
1423 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1424 if (!list_empty(&iucv->message_q.list))
1425 iucv_process_message_q(sk);
1426 if (atomic_read(&iucv->msg_recv) >=
1427 iucv->msglimit / 2) {
1428 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1429 if (err) {
1430 sk->sk_state = IUCV_DISCONN;
1431 sk->sk_state_change(sk);
1432 }
1433 }
1434 }
1435 spin_unlock_bh(&iucv->message_q.lock);
1436 }
1437
1438 done:
1439 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1440 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1441 copied = rlen;
1442
1443 return copied;
1444 }
1445
1446 static inline unsigned int iucv_accept_poll(struct sock *parent)
1447 {
1448 struct iucv_sock *isk, *n;
1449 struct sock *sk;
1450
1451 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1452 sk = (struct sock *) isk;
1453
1454 if (sk->sk_state == IUCV_CONNECTED)
1455 return POLLIN | POLLRDNORM;
1456 }
1457
1458 return 0;
1459 }
1460
1461 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1462 poll_table *wait)
1463 {
1464 struct sock *sk = sock->sk;
1465 unsigned int mask = 0;
1466
1467 sock_poll_wait(file, sk_sleep(sk), wait);
1468
1469 if (sk->sk_state == IUCV_LISTEN)
1470 return iucv_accept_poll(sk);
1471
1472 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1473 mask |= POLLERR |
1474 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1475
1476 if (sk->sk_shutdown & RCV_SHUTDOWN)
1477 mask |= POLLRDHUP;
1478
1479 if (sk->sk_shutdown == SHUTDOWN_MASK)
1480 mask |= POLLHUP;
1481
1482 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1483 (sk->sk_shutdown & RCV_SHUTDOWN))
1484 mask |= POLLIN | POLLRDNORM;
1485
1486 if (sk->sk_state == IUCV_CLOSED)
1487 mask |= POLLHUP;
1488
1489 if (sk->sk_state == IUCV_DISCONN)
1490 mask |= POLLIN;
1491
1492 if (sock_writeable(sk) && iucv_below_msglim(sk))
1493 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1494 else
1495 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1496
1497 return mask;
1498 }
1499
1500 static int iucv_sock_shutdown(struct socket *sock, int how)
1501 {
1502 struct sock *sk = sock->sk;
1503 struct iucv_sock *iucv = iucv_sk(sk);
1504 struct iucv_message txmsg;
1505 int err = 0;
1506
1507 how++;
1508
1509 if ((how & ~SHUTDOWN_MASK) || !how)
1510 return -EINVAL;
1511
1512 lock_sock(sk);
1513 switch (sk->sk_state) {
1514 case IUCV_LISTEN:
1515 case IUCV_DISCONN:
1516 case IUCV_CLOSING:
1517 case IUCV_CLOSED:
1518 err = -ENOTCONN;
1519 goto fail;
1520 default:
1521 break;
1522 }
1523
1524 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1525 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1526 txmsg.class = 0;
1527 txmsg.tag = 0;
1528 err = pr_iucv->message_send(iucv->path, &txmsg,
1529 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1530 if (err) {
1531 switch (err) {
1532 case 1:
1533 err = -ENOTCONN;
1534 break;
1535 case 2:
1536 err = -ECONNRESET;
1537 break;
1538 default:
1539 err = -ENOTCONN;
1540 break;
1541 }
1542 }
1543 } else
1544 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1545 }
1546
1547 sk->sk_shutdown |= how;
1548 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1549 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1550 err = pr_iucv->path_quiesce(iucv->path, NULL);
1551 if (err)
1552 err = -ENOTCONN;
1553 /* skb_queue_purge(&sk->sk_receive_queue); */
1554 }
1555 skb_queue_purge(&sk->sk_receive_queue);
1556 }
1557
1558 /* Wake up anyone sleeping in poll */
1559 sk->sk_state_change(sk);
1560
1561 fail:
1562 release_sock(sk);
1563 return err;
1564 }
1565
1566 static int iucv_sock_release(struct socket *sock)
1567 {
1568 struct sock *sk = sock->sk;
1569 int err = 0;
1570
1571 if (!sk)
1572 return 0;
1573
1574 iucv_sock_close(sk);
1575
1576 sock_orphan(sk);
1577 iucv_sock_kill(sk);
1578 return err;
1579 }
1580
1581 /* getsockopt and setsockopt */
1582 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1583 char __user *optval, unsigned int optlen)
1584 {
1585 struct sock *sk = sock->sk;
1586 struct iucv_sock *iucv = iucv_sk(sk);
1587 int val;
1588 int rc;
1589
1590 if (level != SOL_IUCV)
1591 return -ENOPROTOOPT;
1592
1593 if (optlen < sizeof(int))
1594 return -EINVAL;
1595
1596 if (get_user(val, (int __user *) optval))
1597 return -EFAULT;
1598
1599 rc = 0;
1600
1601 lock_sock(sk);
1602 switch (optname) {
1603 case SO_IPRMDATA_MSG:
1604 if (val)
1605 iucv->flags |= IUCV_IPRMDATA;
1606 else
1607 iucv->flags &= ~IUCV_IPRMDATA;
1608 break;
1609 case SO_MSGLIMIT:
1610 switch (sk->sk_state) {
1611 case IUCV_OPEN:
1612 case IUCV_BOUND:
1613 if (val < 1 || val > (u16)(~0))
1614 rc = -EINVAL;
1615 else
1616 iucv->msglimit = val;
1617 break;
1618 default:
1619 rc = -EINVAL;
1620 break;
1621 }
1622 break;
1623 default:
1624 rc = -ENOPROTOOPT;
1625 break;
1626 }
1627 release_sock(sk);
1628
1629 return rc;
1630 }
1631
1632 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1633 char __user *optval, int __user *optlen)
1634 {
1635 struct sock *sk = sock->sk;
1636 struct iucv_sock *iucv = iucv_sk(sk);
1637 unsigned int val;
1638 int len;
1639
1640 if (level != SOL_IUCV)
1641 return -ENOPROTOOPT;
1642
1643 if (get_user(len, optlen))
1644 return -EFAULT;
1645
1646 if (len < 0)
1647 return -EINVAL;
1648
1649 len = min_t(unsigned int, len, sizeof(int));
1650
1651 switch (optname) {
1652 case SO_IPRMDATA_MSG:
1653 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1654 break;
1655 case SO_MSGLIMIT:
1656 lock_sock(sk);
1657 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1658 : iucv->msglimit; /* default */
1659 release_sock(sk);
1660 break;
1661 case SO_MSGSIZE:
1662 if (sk->sk_state == IUCV_OPEN)
1663 return -EBADFD;
1664 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1665 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1666 0x7fffffff;
1667 break;
1668 default:
1669 return -ENOPROTOOPT;
1670 }
1671
1672 if (put_user(len, optlen))
1673 return -EFAULT;
1674 if (copy_to_user(optval, &val, len))
1675 return -EFAULT;
1676
1677 return 0;
1678 }
1679
1680
1681 /* Callback wrappers - called from iucv base support */
1682 static int iucv_callback_connreq(struct iucv_path *path,
1683 u8 ipvmid[8], u8 ipuser[16])
1684 {
1685 unsigned char user_data[16];
1686 unsigned char nuser_data[16];
1687 unsigned char src_name[8];
1688 struct sock *sk, *nsk;
1689 struct iucv_sock *iucv, *niucv;
1690 int err;
1691
1692 memcpy(src_name, ipuser, 8);
1693 EBCASC(src_name, 8);
1694 /* Find out if this path belongs to af_iucv. */
1695 read_lock(&iucv_sk_list.lock);
1696 iucv = NULL;
1697 sk = NULL;
1698 sk_for_each(sk, &iucv_sk_list.head)
1699 if (sk->sk_state == IUCV_LISTEN &&
1700 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1701 /*
1702 * Found a listening socket with
1703 * src_name == ipuser[0-7].
1704 */
1705 iucv = iucv_sk(sk);
1706 break;
1707 }
1708 read_unlock(&iucv_sk_list.lock);
1709 if (!iucv)
1710 /* No socket found, not one of our paths. */
1711 return -EINVAL;
1712
1713 bh_lock_sock(sk);
1714
1715 /* Check if parent socket is listening */
1716 low_nmcpy(user_data, iucv->src_name);
1717 high_nmcpy(user_data, iucv->dst_name);
1718 ASCEBC(user_data, sizeof(user_data));
1719 if (sk->sk_state != IUCV_LISTEN) {
1720 err = pr_iucv->path_sever(path, user_data);
1721 iucv_path_free(path);
1722 goto fail;
1723 }
1724
1725 /* Check for backlog size */
1726 if (sk_acceptq_is_full(sk)) {
1727 err = pr_iucv->path_sever(path, user_data);
1728 iucv_path_free(path);
1729 goto fail;
1730 }
1731
1732 /* Create the new socket */
1733 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1734 if (!nsk) {
1735 err = pr_iucv->path_sever(path, user_data);
1736 iucv_path_free(path);
1737 goto fail;
1738 }
1739
1740 niucv = iucv_sk(nsk);
1741 iucv_sock_init(nsk, sk);
1742
1743 /* Set the new iucv_sock */
1744 memcpy(niucv->dst_name, ipuser + 8, 8);
1745 EBCASC(niucv->dst_name, 8);
1746 memcpy(niucv->dst_user_id, ipvmid, 8);
1747 memcpy(niucv->src_name, iucv->src_name, 8);
1748 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1749 niucv->path = path;
1750
1751 /* Call iucv_accept */
1752 high_nmcpy(nuser_data, ipuser + 8);
1753 memcpy(nuser_data + 8, niucv->src_name, 8);
1754 ASCEBC(nuser_data + 8, 8);
1755
1756 /* set message limit for path based on msglimit of accepting socket */
1757 niucv->msglimit = iucv->msglimit;
1758 path->msglim = iucv->msglimit;
1759 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1760 if (err) {
1761 iucv_sever_path(nsk, 1);
1762 iucv_sock_kill(nsk);
1763 goto fail;
1764 }
1765
1766 iucv_accept_enqueue(sk, nsk);
1767
1768 /* Wake up accept */
1769 nsk->sk_state = IUCV_CONNECTED;
1770 sk->sk_data_ready(sk);
1771 err = 0;
1772 fail:
1773 bh_unlock_sock(sk);
1774 return 0;
1775 }
1776
1777 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1778 {
1779 struct sock *sk = path->private;
1780
1781 sk->sk_state = IUCV_CONNECTED;
1782 sk->sk_state_change(sk);
1783 }
1784
1785 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1786 {
1787 struct sock *sk = path->private;
1788 struct iucv_sock *iucv = iucv_sk(sk);
1789 struct sk_buff *skb;
1790 struct sock_msg_q *save_msg;
1791 int len;
1792
1793 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1794 pr_iucv->message_reject(path, msg);
1795 return;
1796 }
1797
1798 spin_lock(&iucv->message_q.lock);
1799
1800 if (!list_empty(&iucv->message_q.list) ||
1801 !skb_queue_empty(&iucv->backlog_skb_q))
1802 goto save_message;
1803
1804 len = atomic_read(&sk->sk_rmem_alloc);
1805 len += SKB_TRUESIZE(iucv_msg_length(msg));
1806 if (len > sk->sk_rcvbuf)
1807 goto save_message;
1808
1809 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1810 if (!skb)
1811 goto save_message;
1812
1813 iucv_process_message(sk, skb, path, msg);
1814 goto out_unlock;
1815
1816 save_message:
1817 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1818 if (!save_msg)
1819 goto out_unlock;
1820 save_msg->path = path;
1821 save_msg->msg = *msg;
1822
1823 list_add_tail(&save_msg->list, &iucv->message_q.list);
1824
1825 out_unlock:
1826 spin_unlock(&iucv->message_q.lock);
1827 }
1828
1829 static void iucv_callback_txdone(struct iucv_path *path,
1830 struct iucv_message *msg)
1831 {
1832 struct sock *sk = path->private;
1833 struct sk_buff *this = NULL;
1834 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1835 struct sk_buff *list_skb = list->next;
1836 unsigned long flags;
1837
1838 bh_lock_sock(sk);
1839 if (!skb_queue_empty(list)) {
1840 spin_lock_irqsave(&list->lock, flags);
1841
1842 while (list_skb != (struct sk_buff *)list) {
1843 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1844 this = list_skb;
1845 break;
1846 }
1847 list_skb = list_skb->next;
1848 }
1849 if (this)
1850 __skb_unlink(this, list);
1851
1852 spin_unlock_irqrestore(&list->lock, flags);
1853
1854 if (this) {
1855 kfree_skb(this);
1856 /* wake up any process waiting for sending */
1857 iucv_sock_wake_msglim(sk);
1858 }
1859 }
1860
1861 if (sk->sk_state == IUCV_CLOSING) {
1862 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1863 sk->sk_state = IUCV_CLOSED;
1864 sk->sk_state_change(sk);
1865 }
1866 }
1867 bh_unlock_sock(sk);
1868
1869 }
1870
1871 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1872 {
1873 struct sock *sk = path->private;
1874
1875 if (sk->sk_state == IUCV_CLOSED)
1876 return;
1877
1878 bh_lock_sock(sk);
1879 iucv_sever_path(sk, 1);
1880 sk->sk_state = IUCV_DISCONN;
1881
1882 sk->sk_state_change(sk);
1883 bh_unlock_sock(sk);
1884 }
1885
1886 /* called if the other communication side shuts down its RECV direction;
1887 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1888 */
1889 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1890 {
1891 struct sock *sk = path->private;
1892
1893 bh_lock_sock(sk);
1894 if (sk->sk_state != IUCV_CLOSED) {
1895 sk->sk_shutdown |= SEND_SHUTDOWN;
1896 sk->sk_state_change(sk);
1897 }
1898 bh_unlock_sock(sk);
1899 }
1900
1901 /***************** HiperSockets transport callbacks ********************/
1902 static void afiucv_swap_src_dest(struct sk_buff *skb)
1903 {
1904 struct af_iucv_trans_hdr *trans_hdr =
1905 (struct af_iucv_trans_hdr *)skb->data;
1906 char tmpID[8];
1907 char tmpName[8];
1908
1909 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1910 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1911 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1912 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1913 memcpy(tmpID, trans_hdr->srcUserID, 8);
1914 memcpy(tmpName, trans_hdr->srcAppName, 8);
1915 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1916 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1917 memcpy(trans_hdr->destUserID, tmpID, 8);
1918 memcpy(trans_hdr->destAppName, tmpName, 8);
1919 skb_push(skb, ETH_HLEN);
1920 memset(skb->data, 0, ETH_HLEN);
1921 }
1922
1923 /**
1924 * afiucv_hs_callback_syn - react on received SYN
1925 **/
1926 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1927 {
1928 struct sock *nsk;
1929 struct iucv_sock *iucv, *niucv;
1930 struct af_iucv_trans_hdr *trans_hdr;
1931 int err;
1932
1933 iucv = iucv_sk(sk);
1934 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1935 if (!iucv) {
1936 /* no sock - connection refused */
1937 afiucv_swap_src_dest(skb);
1938 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1939 err = dev_queue_xmit(skb);
1940 goto out;
1941 }
1942
1943 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1944 bh_lock_sock(sk);
1945 if ((sk->sk_state != IUCV_LISTEN) ||
1946 sk_acceptq_is_full(sk) ||
1947 !nsk) {
1948 /* error on server socket - connection refused */
1949 afiucv_swap_src_dest(skb);
1950 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1951 err = dev_queue_xmit(skb);
1952 iucv_sock_kill(nsk);
1953 bh_unlock_sock(sk);
1954 goto out;
1955 }
1956
1957 niucv = iucv_sk(nsk);
1958 iucv_sock_init(nsk, sk);
1959 niucv->transport = AF_IUCV_TRANS_HIPER;
1960 niucv->msglimit = iucv->msglimit;
1961 if (!trans_hdr->window)
1962 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1963 else
1964 niucv->msglimit_peer = trans_hdr->window;
1965 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1966 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1967 memcpy(niucv->src_name, iucv->src_name, 8);
1968 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1969 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1970 niucv->hs_dev = iucv->hs_dev;
1971 dev_hold(niucv->hs_dev);
1972 afiucv_swap_src_dest(skb);
1973 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1974 trans_hdr->window = niucv->msglimit;
1975 /* if receiver acks the xmit connection is established */
1976 err = dev_queue_xmit(skb);
1977 if (!err) {
1978 iucv_accept_enqueue(sk, nsk);
1979 nsk->sk_state = IUCV_CONNECTED;
1980 sk->sk_data_ready(sk);
1981 } else
1982 iucv_sock_kill(nsk);
1983 bh_unlock_sock(sk);
1984
1985 out:
1986 return NET_RX_SUCCESS;
1987 }
1988
1989 /**
1990 * afiucv_hs_callback_synack() - react on received SYN-ACK
1991 **/
1992 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1993 {
1994 struct iucv_sock *iucv = iucv_sk(sk);
1995 struct af_iucv_trans_hdr *trans_hdr =
1996 (struct af_iucv_trans_hdr *)skb->data;
1997
1998 if (!iucv)
1999 goto out;
2000 if (sk->sk_state != IUCV_BOUND)
2001 goto out;
2002 bh_lock_sock(sk);
2003 iucv->msglimit_peer = trans_hdr->window;
2004 sk->sk_state = IUCV_CONNECTED;
2005 sk->sk_state_change(sk);
2006 bh_unlock_sock(sk);
2007 out:
2008 kfree_skb(skb);
2009 return NET_RX_SUCCESS;
2010 }
2011
2012 /**
2013 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2014 **/
2015 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2016 {
2017 struct iucv_sock *iucv = iucv_sk(sk);
2018
2019 if (!iucv)
2020 goto out;
2021 if (sk->sk_state != IUCV_BOUND)
2022 goto out;
2023 bh_lock_sock(sk);
2024 sk->sk_state = IUCV_DISCONN;
2025 sk->sk_state_change(sk);
2026 bh_unlock_sock(sk);
2027 out:
2028 kfree_skb(skb);
2029 return NET_RX_SUCCESS;
2030 }
2031
2032 /**
2033 * afiucv_hs_callback_fin() - react on received FIN
2034 **/
2035 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2036 {
2037 struct iucv_sock *iucv = iucv_sk(sk);
2038
2039 /* other end of connection closed */
2040 if (!iucv)
2041 goto out;
2042 bh_lock_sock(sk);
2043 if (sk->sk_state == IUCV_CONNECTED) {
2044 sk->sk_state = IUCV_DISCONN;
2045 sk->sk_state_change(sk);
2046 }
2047 bh_unlock_sock(sk);
2048 out:
2049 kfree_skb(skb);
2050 return NET_RX_SUCCESS;
2051 }
2052
2053 /**
2054 * afiucv_hs_callback_win() - react on received WIN
2055 **/
2056 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2057 {
2058 struct iucv_sock *iucv = iucv_sk(sk);
2059 struct af_iucv_trans_hdr *trans_hdr =
2060 (struct af_iucv_trans_hdr *)skb->data;
2061
2062 if (!iucv)
2063 return NET_RX_SUCCESS;
2064
2065 if (sk->sk_state != IUCV_CONNECTED)
2066 return NET_RX_SUCCESS;
2067
2068 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2069 iucv_sock_wake_msglim(sk);
2070 return NET_RX_SUCCESS;
2071 }
2072
2073 /**
2074 * afiucv_hs_callback_rx() - react on received data
2075 **/
2076 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2077 {
2078 struct iucv_sock *iucv = iucv_sk(sk);
2079
2080 if (!iucv) {
2081 kfree_skb(skb);
2082 return NET_RX_SUCCESS;
2083 }
2084
2085 if (sk->sk_state != IUCV_CONNECTED) {
2086 kfree_skb(skb);
2087 return NET_RX_SUCCESS;
2088 }
2089
2090 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2091 kfree_skb(skb);
2092 return NET_RX_SUCCESS;
2093 }
2094
2095 /* write stuff from iucv_msg to skb cb */
2096 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2097 kfree_skb(skb);
2098 return NET_RX_SUCCESS;
2099 }
2100 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2101 skb_reset_transport_header(skb);
2102 skb_reset_network_header(skb);
2103 IUCV_SKB_CB(skb)->offset = 0;
2104 spin_lock(&iucv->message_q.lock);
2105 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2106 if (sock_queue_rcv_skb(sk, skb)) {
2107 /* handle rcv queue full */
2108 skb_queue_tail(&iucv->backlog_skb_q, skb);
2109 }
2110 } else
2111 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2112 spin_unlock(&iucv->message_q.lock);
2113 return NET_RX_SUCCESS;
2114 }
2115
2116 /**
2117 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2118 * transport
2119 * called from netif RX softirq
2120 **/
2121 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2122 struct packet_type *pt, struct net_device *orig_dev)
2123 {
2124 struct sock *sk;
2125 struct iucv_sock *iucv;
2126 struct af_iucv_trans_hdr *trans_hdr;
2127 char nullstring[8];
2128 int err = 0;
2129
2130 skb_pull(skb, ETH_HLEN);
2131 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2132 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2133 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2134 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2135 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2136 memset(nullstring, 0, sizeof(nullstring));
2137 iucv = NULL;
2138 sk = NULL;
2139 read_lock(&iucv_sk_list.lock);
2140 sk_for_each(sk, &iucv_sk_list.head) {
2141 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2142 if ((!memcmp(&iucv_sk(sk)->src_name,
2143 trans_hdr->destAppName, 8)) &&
2144 (!memcmp(&iucv_sk(sk)->src_user_id,
2145 trans_hdr->destUserID, 8)) &&
2146 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2147 (!memcmp(&iucv_sk(sk)->dst_user_id,
2148 nullstring, 8))) {
2149 iucv = iucv_sk(sk);
2150 break;
2151 }
2152 } else {
2153 if ((!memcmp(&iucv_sk(sk)->src_name,
2154 trans_hdr->destAppName, 8)) &&
2155 (!memcmp(&iucv_sk(sk)->src_user_id,
2156 trans_hdr->destUserID, 8)) &&
2157 (!memcmp(&iucv_sk(sk)->dst_name,
2158 trans_hdr->srcAppName, 8)) &&
2159 (!memcmp(&iucv_sk(sk)->dst_user_id,
2160 trans_hdr->srcUserID, 8))) {
2161 iucv = iucv_sk(sk);
2162 break;
2163 }
2164 }
2165 }
2166 read_unlock(&iucv_sk_list.lock);
2167 if (!iucv)
2168 sk = NULL;
2169
2170 /* no sock
2171 how should we send with no sock
2172 1) send without sock no send rc checking?
2173 2) introduce default sock to handle this cases
2174
2175 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2176 data -> send FIN
2177 SYN|ACK, SYN|FIN, FIN -> no action? */
2178
2179 switch (trans_hdr->flags) {
2180 case AF_IUCV_FLAG_SYN:
2181 /* connect request */
2182 err = afiucv_hs_callback_syn(sk, skb);
2183 break;
2184 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2185 /* connect request confirmed */
2186 err = afiucv_hs_callback_synack(sk, skb);
2187 break;
2188 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2189 /* connect request refused */
2190 err = afiucv_hs_callback_synfin(sk, skb);
2191 break;
2192 case (AF_IUCV_FLAG_FIN):
2193 /* close request */
2194 err = afiucv_hs_callback_fin(sk, skb);
2195 break;
2196 case (AF_IUCV_FLAG_WIN):
2197 err = afiucv_hs_callback_win(sk, skb);
2198 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2199 kfree_skb(skb);
2200 break;
2201 }
2202 /* fall through and receive non-zero length data */
2203 case (AF_IUCV_FLAG_SHT):
2204 /* shutdown request */
2205 /* fall through and receive zero length data */
2206 case 0:
2207 /* plain data frame */
2208 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2209 err = afiucv_hs_callback_rx(sk, skb);
2210 break;
2211 default:
2212 ;
2213 }
2214
2215 return err;
2216 }
2217
2218 /**
2219 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2220 * transport
2221 **/
2222 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2223 enum iucv_tx_notify n)
2224 {
2225 struct sock *isk = skb->sk;
2226 struct sock *sk = NULL;
2227 struct iucv_sock *iucv = NULL;
2228 struct sk_buff_head *list;
2229 struct sk_buff *list_skb;
2230 struct sk_buff *nskb;
2231 unsigned long flags;
2232
2233 read_lock_irqsave(&iucv_sk_list.lock, flags);
2234 sk_for_each(sk, &iucv_sk_list.head)
2235 if (sk == isk) {
2236 iucv = iucv_sk(sk);
2237 break;
2238 }
2239 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2240
2241 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2242 return;
2243
2244 list = &iucv->send_skb_q;
2245 spin_lock_irqsave(&list->lock, flags);
2246 if (skb_queue_empty(list))
2247 goto out_unlock;
2248 list_skb = list->next;
2249 nskb = list_skb->next;
2250 while (list_skb != (struct sk_buff *)list) {
2251 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2252 switch (n) {
2253 case TX_NOTIFY_OK:
2254 __skb_unlink(list_skb, list);
2255 kfree_skb(list_skb);
2256 iucv_sock_wake_msglim(sk);
2257 break;
2258 case TX_NOTIFY_PENDING:
2259 atomic_inc(&iucv->pendings);
2260 break;
2261 case TX_NOTIFY_DELAYED_OK:
2262 __skb_unlink(list_skb, list);
2263 atomic_dec(&iucv->pendings);
2264 if (atomic_read(&iucv->pendings) <= 0)
2265 iucv_sock_wake_msglim(sk);
2266 kfree_skb(list_skb);
2267 break;
2268 case TX_NOTIFY_UNREACHABLE:
2269 case TX_NOTIFY_DELAYED_UNREACHABLE:
2270 case TX_NOTIFY_TPQFULL: /* not yet used */
2271 case TX_NOTIFY_GENERALERROR:
2272 case TX_NOTIFY_DELAYED_GENERALERROR:
2273 __skb_unlink(list_skb, list);
2274 kfree_skb(list_skb);
2275 if (sk->sk_state == IUCV_CONNECTED) {
2276 sk->sk_state = IUCV_DISCONN;
2277 sk->sk_state_change(sk);
2278 }
2279 break;
2280 }
2281 break;
2282 }
2283 list_skb = nskb;
2284 nskb = nskb->next;
2285 }
2286 out_unlock:
2287 spin_unlock_irqrestore(&list->lock, flags);
2288
2289 if (sk->sk_state == IUCV_CLOSING) {
2290 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2291 sk->sk_state = IUCV_CLOSED;
2292 sk->sk_state_change(sk);
2293 }
2294 }
2295
2296 }
2297
2298 /*
2299 * afiucv_netdev_event: handle netdev notifier chain events
2300 */
2301 static int afiucv_netdev_event(struct notifier_block *this,
2302 unsigned long event, void *ptr)
2303 {
2304 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2305 struct sock *sk;
2306 struct iucv_sock *iucv;
2307
2308 switch (event) {
2309 case NETDEV_REBOOT:
2310 case NETDEV_GOING_DOWN:
2311 sk_for_each(sk, &iucv_sk_list.head) {
2312 iucv = iucv_sk(sk);
2313 if ((iucv->hs_dev == event_dev) &&
2314 (sk->sk_state == IUCV_CONNECTED)) {
2315 if (event == NETDEV_GOING_DOWN)
2316 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2317 sk->sk_state = IUCV_DISCONN;
2318 sk->sk_state_change(sk);
2319 }
2320 }
2321 break;
2322 case NETDEV_DOWN:
2323 case NETDEV_UNREGISTER:
2324 default:
2325 break;
2326 }
2327 return NOTIFY_DONE;
2328 }
2329
2330 static struct notifier_block afiucv_netdev_notifier = {
2331 .notifier_call = afiucv_netdev_event,
2332 };
2333
2334 static const struct proto_ops iucv_sock_ops = {
2335 .family = PF_IUCV,
2336 .owner = THIS_MODULE,
2337 .release = iucv_sock_release,
2338 .bind = iucv_sock_bind,
2339 .connect = iucv_sock_connect,
2340 .listen = iucv_sock_listen,
2341 .accept = iucv_sock_accept,
2342 .getname = iucv_sock_getname,
2343 .sendmsg = iucv_sock_sendmsg,
2344 .recvmsg = iucv_sock_recvmsg,
2345 .poll = iucv_sock_poll,
2346 .ioctl = sock_no_ioctl,
2347 .mmap = sock_no_mmap,
2348 .socketpair = sock_no_socketpair,
2349 .shutdown = iucv_sock_shutdown,
2350 .setsockopt = iucv_sock_setsockopt,
2351 .getsockopt = iucv_sock_getsockopt,
2352 };
2353
2354 static const struct net_proto_family iucv_sock_family_ops = {
2355 .family = AF_IUCV,
2356 .owner = THIS_MODULE,
2357 .create = iucv_sock_create,
2358 };
2359
2360 static struct packet_type iucv_packet_type = {
2361 .type = cpu_to_be16(ETH_P_AF_IUCV),
2362 .func = afiucv_hs_rcv,
2363 };
2364
2365 static int afiucv_iucv_init(void)
2366 {
2367 int err;
2368
2369 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2370 if (err)
2371 goto out;
2372 /* establish dummy device */
2373 af_iucv_driver.bus = pr_iucv->bus;
2374 err = driver_register(&af_iucv_driver);
2375 if (err)
2376 goto out_iucv;
2377 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2378 if (!af_iucv_dev) {
2379 err = -ENOMEM;
2380 goto out_driver;
2381 }
2382 dev_set_name(af_iucv_dev, "af_iucv");
2383 af_iucv_dev->bus = pr_iucv->bus;
2384 af_iucv_dev->parent = pr_iucv->root;
2385 af_iucv_dev->release = (void (*)(struct device *))kfree;
2386 af_iucv_dev->driver = &af_iucv_driver;
2387 err = device_register(af_iucv_dev);
2388 if (err)
2389 goto out_driver;
2390 return 0;
2391
2392 out_driver:
2393 driver_unregister(&af_iucv_driver);
2394 out_iucv:
2395 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2396 out:
2397 return err;
2398 }
2399
2400 static int __init afiucv_init(void)
2401 {
2402 int err;
2403
2404 if (MACHINE_IS_VM) {
2405 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2406 if (unlikely(err)) {
2407 WARN_ON(err);
2408 err = -EPROTONOSUPPORT;
2409 goto out;
2410 }
2411
2412 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2413 if (!pr_iucv) {
2414 printk(KERN_WARNING "iucv_if lookup failed\n");
2415 memset(&iucv_userid, 0, sizeof(iucv_userid));
2416 }
2417 } else {
2418 memset(&iucv_userid, 0, sizeof(iucv_userid));
2419 pr_iucv = NULL;
2420 }
2421
2422 err = proto_register(&iucv_proto, 0);
2423 if (err)
2424 goto out;
2425 err = sock_register(&iucv_sock_family_ops);
2426 if (err)
2427 goto out_proto;
2428
2429 if (pr_iucv) {
2430 err = afiucv_iucv_init();
2431 if (err)
2432 goto out_sock;
2433 } else
2434 register_netdevice_notifier(&afiucv_netdev_notifier);
2435 dev_add_pack(&iucv_packet_type);
2436 return 0;
2437
2438 out_sock:
2439 sock_unregister(PF_IUCV);
2440 out_proto:
2441 proto_unregister(&iucv_proto);
2442 out:
2443 if (pr_iucv)
2444 symbol_put(iucv_if);
2445 return err;
2446 }
2447
2448 static void __exit afiucv_exit(void)
2449 {
2450 if (pr_iucv) {
2451 device_unregister(af_iucv_dev);
2452 driver_unregister(&af_iucv_driver);
2453 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2454 symbol_put(iucv_if);
2455 } else
2456 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2457 dev_remove_pack(&iucv_packet_type);
2458 sock_unregister(PF_IUCV);
2459 proto_unregister(&iucv_proto);
2460 }
2461
2462 module_init(afiucv_init);
2463 module_exit(afiucv_exit);
2464
2465 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2466 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2467 MODULE_VERSION(VERSION);
2468 MODULE_LICENSE("GPL");
2469 MODULE_ALIAS_NETPROTO(PF_IUCV);
2470
Linux with added FPC-III support