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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[GitHub/mt8127/android_kernel_alcatel_ttab.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 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 /* Bind an unbound socket */
686 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
687 int addr_len)
688 {
689 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
690 struct sock *sk = sock->sk;
691 struct iucv_sock *iucv;
692 int err = 0;
693 struct net_device *dev;
694 char uid[9];
695
696 /* Verify the input sockaddr */
697 if (!addr || addr->sa_family != AF_IUCV)
698 return -EINVAL;
699
700 lock_sock(sk);
701 if (sk->sk_state != IUCV_OPEN) {
702 err = -EBADFD;
703 goto done;
704 }
705
706 write_lock_bh(&iucv_sk_list.lock);
707
708 iucv = iucv_sk(sk);
709 if (__iucv_get_sock_by_name(sa->siucv_name)) {
710 err = -EADDRINUSE;
711 goto done_unlock;
712 }
713 if (iucv->path)
714 goto done_unlock;
715
716 /* Bind the socket */
717 if (pr_iucv)
718 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
719 goto vm_bind; /* VM IUCV transport */
720
721 /* try hiper transport */
722 memcpy(uid, sa->siucv_user_id, sizeof(uid));
723 ASCEBC(uid, 8);
724 rcu_read_lock();
725 for_each_netdev_rcu(&init_net, dev) {
726 if (!memcmp(dev->perm_addr, uid, 8)) {
727 memcpy(iucv->src_name, sa->siucv_name, 8);
728 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
729 sk->sk_bound_dev_if = dev->ifindex;
730 iucv->hs_dev = dev;
731 dev_hold(dev);
732 sk->sk_state = IUCV_BOUND;
733 iucv->transport = AF_IUCV_TRANS_HIPER;
734 if (!iucv->msglimit)
735 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
736 rcu_read_unlock();
737 goto done_unlock;
738 }
739 }
740 rcu_read_unlock();
741 vm_bind:
742 if (pr_iucv) {
743 /* use local userid for backward compat */
744 memcpy(iucv->src_name, sa->siucv_name, 8);
745 memcpy(iucv->src_user_id, iucv_userid, 8);
746 sk->sk_state = IUCV_BOUND;
747 iucv->transport = AF_IUCV_TRANS_IUCV;
748 if (!iucv->msglimit)
749 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
750 goto done_unlock;
751 }
752 /* found no dev to bind */
753 err = -ENODEV;
754 done_unlock:
755 /* Release the socket list lock */
756 write_unlock_bh(&iucv_sk_list.lock);
757 done:
758 release_sock(sk);
759 return err;
760 }
761
762 /* Automatically bind an unbound socket */
763 static int iucv_sock_autobind(struct sock *sk)
764 {
765 struct iucv_sock *iucv = iucv_sk(sk);
766 char name[12];
767 int err = 0;
768
769 if (unlikely(!pr_iucv))
770 return -EPROTO;
771
772 memcpy(iucv->src_user_id, iucv_userid, 8);
773
774 write_lock_bh(&iucv_sk_list.lock);
775
776 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
777 while (__iucv_get_sock_by_name(name)) {
778 sprintf(name, "%08x",
779 atomic_inc_return(&iucv_sk_list.autobind_name));
780 }
781
782 write_unlock_bh(&iucv_sk_list.lock);
783
784 memcpy(&iucv->src_name, name, 8);
785
786 if (!iucv->msglimit)
787 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
788
789 return err;
790 }
791
792 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
793 {
794 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
795 struct sock *sk = sock->sk;
796 struct iucv_sock *iucv = iucv_sk(sk);
797 unsigned char user_data[16];
798 int err;
799
800 high_nmcpy(user_data, sa->siucv_name);
801 low_nmcpy(user_data, iucv->src_name);
802 ASCEBC(user_data, sizeof(user_data));
803
804 /* Create path. */
805 iucv->path = iucv_path_alloc(iucv->msglimit,
806 IUCV_IPRMDATA, GFP_KERNEL);
807 if (!iucv->path) {
808 err = -ENOMEM;
809 goto done;
810 }
811 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
812 sa->siucv_user_id, NULL, user_data,
813 sk);
814 if (err) {
815 iucv_path_free(iucv->path);
816 iucv->path = NULL;
817 switch (err) {
818 case 0x0b: /* Target communicator is not logged on */
819 err = -ENETUNREACH;
820 break;
821 case 0x0d: /* Max connections for this guest exceeded */
822 case 0x0e: /* Max connections for target guest exceeded */
823 err = -EAGAIN;
824 break;
825 case 0x0f: /* Missing IUCV authorization */
826 err = -EACCES;
827 break;
828 default:
829 err = -ECONNREFUSED;
830 break;
831 }
832 }
833 done:
834 return err;
835 }
836
837 /* Connect an unconnected socket */
838 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
839 int alen, int flags)
840 {
841 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
842 struct sock *sk = sock->sk;
843 struct iucv_sock *iucv = iucv_sk(sk);
844 int err;
845
846 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
847 return -EINVAL;
848
849 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
850 return -EBADFD;
851
852 if (sk->sk_state == IUCV_OPEN &&
853 iucv->transport == AF_IUCV_TRANS_HIPER)
854 return -EBADFD; /* explicit bind required */
855
856 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
857 return -EINVAL;
858
859 if (sk->sk_state == IUCV_OPEN) {
860 err = iucv_sock_autobind(sk);
861 if (unlikely(err))
862 return err;
863 }
864
865 lock_sock(sk);
866
867 /* Set the destination information */
868 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
869 memcpy(iucv->dst_name, sa->siucv_name, 8);
870
871 if (iucv->transport == AF_IUCV_TRANS_HIPER)
872 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
873 else
874 err = afiucv_path_connect(sock, addr);
875 if (err)
876 goto done;
877
878 if (sk->sk_state != IUCV_CONNECTED)
879 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
880 IUCV_DISCONN),
881 sock_sndtimeo(sk, flags & O_NONBLOCK));
882
883 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
884 err = -ECONNREFUSED;
885
886 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
887 iucv_sever_path(sk, 0);
888
889 done:
890 release_sock(sk);
891 return err;
892 }
893
894 /* Move a socket into listening state. */
895 static int iucv_sock_listen(struct socket *sock, int backlog)
896 {
897 struct sock *sk = sock->sk;
898 int err;
899
900 lock_sock(sk);
901
902 err = -EINVAL;
903 if (sk->sk_state != IUCV_BOUND)
904 goto done;
905
906 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
907 goto done;
908
909 sk->sk_max_ack_backlog = backlog;
910 sk->sk_ack_backlog = 0;
911 sk->sk_state = IUCV_LISTEN;
912 err = 0;
913
914 done:
915 release_sock(sk);
916 return err;
917 }
918
919 /* Accept a pending connection */
920 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
921 int flags)
922 {
923 DECLARE_WAITQUEUE(wait, current);
924 struct sock *sk = sock->sk, *nsk;
925 long timeo;
926 int err = 0;
927
928 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
929
930 if (sk->sk_state != IUCV_LISTEN) {
931 err = -EBADFD;
932 goto done;
933 }
934
935 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
936
937 /* Wait for an incoming connection */
938 add_wait_queue_exclusive(sk_sleep(sk), &wait);
939 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
940 set_current_state(TASK_INTERRUPTIBLE);
941 if (!timeo) {
942 err = -EAGAIN;
943 break;
944 }
945
946 release_sock(sk);
947 timeo = schedule_timeout(timeo);
948 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
949
950 if (sk->sk_state != IUCV_LISTEN) {
951 err = -EBADFD;
952 break;
953 }
954
955 if (signal_pending(current)) {
956 err = sock_intr_errno(timeo);
957 break;
958 }
959 }
960
961 set_current_state(TASK_RUNNING);
962 remove_wait_queue(sk_sleep(sk), &wait);
963
964 if (err)
965 goto done;
966
967 newsock->state = SS_CONNECTED;
968
969 done:
970 release_sock(sk);
971 return err;
972 }
973
974 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
975 int *len, int peer)
976 {
977 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
978 struct sock *sk = sock->sk;
979 struct iucv_sock *iucv = iucv_sk(sk);
980
981 addr->sa_family = AF_IUCV;
982 *len = sizeof(struct sockaddr_iucv);
983
984 if (peer) {
985 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
986 memcpy(siucv->siucv_name, iucv->dst_name, 8);
987 } else {
988 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
989 memcpy(siucv->siucv_name, iucv->src_name, 8);
990 }
991 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
992 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
993 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
994
995 return 0;
996 }
997
998 /**
999 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1000 * @path: IUCV path
1001 * @msg: Pointer to a struct iucv_message
1002 * @skb: The socket data to send, skb->len MUST BE <= 7
1003 *
1004 * Send the socket data in the parameter list in the iucv message
1005 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1006 * list and the socket data len at index 7 (last byte).
1007 * See also iucv_msg_length().
1008 *
1009 * Returns the error code from the iucv_message_send() call.
1010 */
1011 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1012 struct sk_buff *skb)
1013 {
1014 u8 prmdata[8];
1015
1016 memcpy(prmdata, (void *) skb->data, skb->len);
1017 prmdata[7] = 0xff - (u8) skb->len;
1018 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1019 (void *) prmdata, 8);
1020 }
1021
1022 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1023 struct msghdr *msg, size_t len)
1024 {
1025 struct sock *sk = sock->sk;
1026 struct iucv_sock *iucv = iucv_sk(sk);
1027 struct sk_buff *skb;
1028 struct iucv_message txmsg;
1029 struct cmsghdr *cmsg;
1030 int cmsg_done;
1031 long timeo;
1032 char user_id[9];
1033 char appl_id[9];
1034 int err;
1035 int noblock = msg->msg_flags & MSG_DONTWAIT;
1036
1037 err = sock_error(sk);
1038 if (err)
1039 return err;
1040
1041 if (msg->msg_flags & MSG_OOB)
1042 return -EOPNOTSUPP;
1043
1044 /* SOCK_SEQPACKET: we do not support segmented records */
1045 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1046 return -EOPNOTSUPP;
1047
1048 lock_sock(sk);
1049
1050 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1051 err = -EPIPE;
1052 goto out;
1053 }
1054
1055 /* Return if the socket is not in connected state */
1056 if (sk->sk_state != IUCV_CONNECTED) {
1057 err = -ENOTCONN;
1058 goto out;
1059 }
1060
1061 /* initialize defaults */
1062 cmsg_done = 0; /* check for duplicate headers */
1063 txmsg.class = 0;
1064
1065 /* iterate over control messages */
1066 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
1067 cmsg = CMSG_NXTHDR(msg, cmsg)) {
1068
1069 if (!CMSG_OK(msg, cmsg)) {
1070 err = -EINVAL;
1071 goto out;
1072 }
1073
1074 if (cmsg->cmsg_level != SOL_IUCV)
1075 continue;
1076
1077 if (cmsg->cmsg_type & cmsg_done) {
1078 err = -EINVAL;
1079 goto out;
1080 }
1081 cmsg_done |= cmsg->cmsg_type;
1082
1083 switch (cmsg->cmsg_type) {
1084 case SCM_IUCV_TRGCLS:
1085 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1086 err = -EINVAL;
1087 goto out;
1088 }
1089
1090 /* set iucv message target class */
1091 memcpy(&txmsg.class,
1092 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1093
1094 break;
1095
1096 default:
1097 err = -EINVAL;
1098 goto out;
1099 break;
1100 }
1101 }
1102
1103 /* allocate one skb for each iucv message:
1104 * this is fine for SOCK_SEQPACKET (unless we want to support
1105 * segmented records using the MSG_EOR flag), but
1106 * for SOCK_STREAM we might want to improve it in future */
1107 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1108 skb = sock_alloc_send_skb(sk,
1109 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1110 noblock, &err);
1111 else
1112 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1113 if (!skb) {
1114 err = -ENOMEM;
1115 goto out;
1116 }
1117 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1118 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1119 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1120 err = -EFAULT;
1121 goto fail;
1122 }
1123
1124 /* wait if outstanding messages for iucv path has reached */
1125 timeo = sock_sndtimeo(sk, noblock);
1126 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1127 if (err)
1128 goto fail;
1129
1130 /* return -ECONNRESET if the socket is no longer connected */
1131 if (sk->sk_state != IUCV_CONNECTED) {
1132 err = -ECONNRESET;
1133 goto fail;
1134 }
1135
1136 /* increment and save iucv message tag for msg_completion cbk */
1137 txmsg.tag = iucv->send_tag++;
1138 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1139
1140 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1141 atomic_inc(&iucv->msg_sent);
1142 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1143 if (err) {
1144 atomic_dec(&iucv->msg_sent);
1145 goto fail;
1146 }
1147 goto release;
1148 }
1149 skb_queue_tail(&iucv->send_skb_q, skb);
1150
1151 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1152 && skb->len <= 7) {
1153 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1154
1155 /* on success: there is no message_complete callback
1156 * for an IPRMDATA msg; remove skb from send queue */
1157 if (err == 0) {
1158 skb_unlink(skb, &iucv->send_skb_q);
1159 kfree_skb(skb);
1160 }
1161
1162 /* this error should never happen since the
1163 * IUCV_IPRMDATA path flag is set... sever path */
1164 if (err == 0x15) {
1165 pr_iucv->path_sever(iucv->path, NULL);
1166 skb_unlink(skb, &iucv->send_skb_q);
1167 err = -EPIPE;
1168 goto fail;
1169 }
1170 } else
1171 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1172 (void *) skb->data, skb->len);
1173 if (err) {
1174 if (err == 3) {
1175 user_id[8] = 0;
1176 memcpy(user_id, iucv->dst_user_id, 8);
1177 appl_id[8] = 0;
1178 memcpy(appl_id, iucv->dst_name, 8);
1179 pr_err("Application %s on z/VM guest %s"
1180 " exceeds message limit\n",
1181 appl_id, user_id);
1182 err = -EAGAIN;
1183 } else
1184 err = -EPIPE;
1185 skb_unlink(skb, &iucv->send_skb_q);
1186 goto fail;
1187 }
1188
1189 release:
1190 release_sock(sk);
1191 return len;
1192
1193 fail:
1194 kfree_skb(skb);
1195 out:
1196 release_sock(sk);
1197 return err;
1198 }
1199
1200 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1201 *
1202 * Locking: must be called with message_q.lock held
1203 */
1204 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1205 {
1206 int dataleft, size, copied = 0;
1207 struct sk_buff *nskb;
1208
1209 dataleft = len;
1210 while (dataleft) {
1211 if (dataleft >= sk->sk_rcvbuf / 4)
1212 size = sk->sk_rcvbuf / 4;
1213 else
1214 size = dataleft;
1215
1216 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1217 if (!nskb)
1218 return -ENOMEM;
1219
1220 /* copy target class to control buffer of new skb */
1221 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1222
1223 /* copy data fragment */
1224 memcpy(nskb->data, skb->data + copied, size);
1225 copied += size;
1226 dataleft -= size;
1227
1228 skb_reset_transport_header(nskb);
1229 skb_reset_network_header(nskb);
1230 nskb->len = size;
1231
1232 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1233 }
1234
1235 return 0;
1236 }
1237
1238 /* iucv_process_message() - Receive a single outstanding IUCV message
1239 *
1240 * Locking: must be called with message_q.lock held
1241 */
1242 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1243 struct iucv_path *path,
1244 struct iucv_message *msg)
1245 {
1246 int rc;
1247 unsigned int len;
1248
1249 len = iucv_msg_length(msg);
1250
1251 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1252 /* Note: the first 4 bytes are reserved for msg tag */
1253 IUCV_SKB_CB(skb)->class = msg->class;
1254
1255 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1256 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1257 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1258 skb->data = NULL;
1259 skb->len = 0;
1260 }
1261 } else {
1262 rc = pr_iucv->message_receive(path, msg,
1263 msg->flags & IUCV_IPRMDATA,
1264 skb->data, len, NULL);
1265 if (rc) {
1266 kfree_skb(skb);
1267 return;
1268 }
1269 /* we need to fragment iucv messages for SOCK_STREAM only;
1270 * for SOCK_SEQPACKET, it is only relevant if we support
1271 * record segmentation using MSG_EOR (see also recvmsg()) */
1272 if (sk->sk_type == SOCK_STREAM &&
1273 skb->truesize >= sk->sk_rcvbuf / 4) {
1274 rc = iucv_fragment_skb(sk, skb, len);
1275 kfree_skb(skb);
1276 skb = NULL;
1277 if (rc) {
1278 pr_iucv->path_sever(path, NULL);
1279 return;
1280 }
1281 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1282 } else {
1283 skb_reset_transport_header(skb);
1284 skb_reset_network_header(skb);
1285 skb->len = len;
1286 }
1287 }
1288
1289 IUCV_SKB_CB(skb)->offset = 0;
1290 if (sock_queue_rcv_skb(sk, skb))
1291 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1292 }
1293
1294 /* iucv_process_message_q() - Process outstanding IUCV messages
1295 *
1296 * Locking: must be called with message_q.lock held
1297 */
1298 static void iucv_process_message_q(struct sock *sk)
1299 {
1300 struct iucv_sock *iucv = iucv_sk(sk);
1301 struct sk_buff *skb;
1302 struct sock_msg_q *p, *n;
1303
1304 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1305 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1306 if (!skb)
1307 break;
1308 iucv_process_message(sk, skb, p->path, &p->msg);
1309 list_del(&p->list);
1310 kfree(p);
1311 if (!skb_queue_empty(&iucv->backlog_skb_q))
1312 break;
1313 }
1314 }
1315
1316 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1317 struct msghdr *msg, size_t len, int flags)
1318 {
1319 int noblock = flags & MSG_DONTWAIT;
1320 struct sock *sk = sock->sk;
1321 struct iucv_sock *iucv = iucv_sk(sk);
1322 unsigned int copied, rlen;
1323 struct sk_buff *skb, *rskb, *cskb;
1324 int err = 0;
1325 u32 offset;
1326
1327 msg->msg_namelen = 0;
1328
1329 if ((sk->sk_state == IUCV_DISCONN) &&
1330 skb_queue_empty(&iucv->backlog_skb_q) &&
1331 skb_queue_empty(&sk->sk_receive_queue) &&
1332 list_empty(&iucv->message_q.list))
1333 return 0;
1334
1335 if (flags & (MSG_OOB))
1336 return -EOPNOTSUPP;
1337
1338 /* receive/dequeue next skb:
1339 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1340 skb = skb_recv_datagram(sk, flags, noblock, &err);
1341 if (!skb) {
1342 if (sk->sk_shutdown & RCV_SHUTDOWN)
1343 return 0;
1344 return err;
1345 }
1346
1347 offset = IUCV_SKB_CB(skb)->offset;
1348 rlen = skb->len - offset; /* real length of skb */
1349 copied = min_t(unsigned int, rlen, len);
1350 if (!rlen)
1351 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1352
1353 cskb = skb;
1354 if (skb_copy_datagram_iovec(cskb, offset, msg->msg_iov, copied)) {
1355 if (!(flags & MSG_PEEK))
1356 skb_queue_head(&sk->sk_receive_queue, skb);
1357 return -EFAULT;
1358 }
1359
1360 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1361 if (sk->sk_type == SOCK_SEQPACKET) {
1362 if (copied < rlen)
1363 msg->msg_flags |= MSG_TRUNC;
1364 /* each iucv message contains a complete record */
1365 msg->msg_flags |= MSG_EOR;
1366 }
1367
1368 /* create control message to store iucv msg target class:
1369 * get the trgcls from the control buffer of the skb due to
1370 * fragmentation of original iucv message. */
1371 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1372 sizeof(IUCV_SKB_CB(skb)->class),
1373 (void *)&IUCV_SKB_CB(skb)->class);
1374 if (err) {
1375 if (!(flags & MSG_PEEK))
1376 skb_queue_head(&sk->sk_receive_queue, skb);
1377 return err;
1378 }
1379
1380 /* Mark read part of skb as used */
1381 if (!(flags & MSG_PEEK)) {
1382
1383 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1384 if (sk->sk_type == SOCK_STREAM) {
1385 if (copied < rlen) {
1386 IUCV_SKB_CB(skb)->offset = offset + copied;
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
1466 if (sk->sk_shutdown & RCV_SHUTDOWN)
1467 mask |= POLLRDHUP;
1468
1469 if (sk->sk_shutdown == SHUTDOWN_MASK)
1470 mask |= POLLHUP;
1471
1472 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1473 (sk->sk_shutdown & RCV_SHUTDOWN))
1474 mask |= POLLIN | POLLRDNORM;
1475
1476 if (sk->sk_state == IUCV_CLOSED)
1477 mask |= POLLHUP;
1478
1479 if (sk->sk_state == IUCV_DISCONN)
1480 mask |= POLLIN;
1481
1482 if (sock_writeable(sk) && iucv_below_msglim(sk))
1483 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1484 else
1485 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1486
1487 return mask;
1488 }
1489
1490 static int iucv_sock_shutdown(struct socket *sock, int how)
1491 {
1492 struct sock *sk = sock->sk;
1493 struct iucv_sock *iucv = iucv_sk(sk);
1494 struct iucv_message txmsg;
1495 int err = 0;
1496
1497 how++;
1498
1499 if ((how & ~SHUTDOWN_MASK) || !how)
1500 return -EINVAL;
1501
1502 lock_sock(sk);
1503 switch (sk->sk_state) {
1504 case IUCV_LISTEN:
1505 case IUCV_DISCONN:
1506 case IUCV_CLOSING:
1507 case IUCV_CLOSED:
1508 err = -ENOTCONN;
1509 goto fail;
1510 default:
1511 break;
1512 }
1513
1514 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1515 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1516 txmsg.class = 0;
1517 txmsg.tag = 0;
1518 err = pr_iucv->message_send(iucv->path, &txmsg,
1519 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1520 if (err) {
1521 switch (err) {
1522 case 1:
1523 err = -ENOTCONN;
1524 break;
1525 case 2:
1526 err = -ECONNRESET;
1527 break;
1528 default:
1529 err = -ENOTCONN;
1530 break;
1531 }
1532 }
1533 } else
1534 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1535 }
1536
1537 sk->sk_shutdown |= how;
1538 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1539 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1540 err = pr_iucv->path_quiesce(iucv->path, NULL);
1541 if (err)
1542 err = -ENOTCONN;
1543 /* skb_queue_purge(&sk->sk_receive_queue); */
1544 }
1545 skb_queue_purge(&sk->sk_receive_queue);
1546 }
1547
1548 /* Wake up anyone sleeping in poll */
1549 sk->sk_state_change(sk);
1550
1551 fail:
1552 release_sock(sk);
1553 return err;
1554 }
1555
1556 static int iucv_sock_release(struct socket *sock)
1557 {
1558 struct sock *sk = sock->sk;
1559 int err = 0;
1560
1561 if (!sk)
1562 return 0;
1563
1564 iucv_sock_close(sk);
1565
1566 sock_orphan(sk);
1567 iucv_sock_kill(sk);
1568 return err;
1569 }
1570
1571 /* getsockopt and setsockopt */
1572 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1573 char __user *optval, unsigned int optlen)
1574 {
1575 struct sock *sk = sock->sk;
1576 struct iucv_sock *iucv = iucv_sk(sk);
1577 int val;
1578 int rc;
1579
1580 if (level != SOL_IUCV)
1581 return -ENOPROTOOPT;
1582
1583 if (optlen < sizeof(int))
1584 return -EINVAL;
1585
1586 if (get_user(val, (int __user *) optval))
1587 return -EFAULT;
1588
1589 rc = 0;
1590
1591 lock_sock(sk);
1592 switch (optname) {
1593 case SO_IPRMDATA_MSG:
1594 if (val)
1595 iucv->flags |= IUCV_IPRMDATA;
1596 else
1597 iucv->flags &= ~IUCV_IPRMDATA;
1598 break;
1599 case SO_MSGLIMIT:
1600 switch (sk->sk_state) {
1601 case IUCV_OPEN:
1602 case IUCV_BOUND:
1603 if (val < 1 || val > (u16)(~0))
1604 rc = -EINVAL;
1605 else
1606 iucv->msglimit = val;
1607 break;
1608 default:
1609 rc = -EINVAL;
1610 break;
1611 }
1612 break;
1613 default:
1614 rc = -ENOPROTOOPT;
1615 break;
1616 }
1617 release_sock(sk);
1618
1619 return rc;
1620 }
1621
1622 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1623 char __user *optval, int __user *optlen)
1624 {
1625 struct sock *sk = sock->sk;
1626 struct iucv_sock *iucv = iucv_sk(sk);
1627 unsigned int val;
1628 int len;
1629
1630 if (level != SOL_IUCV)
1631 return -ENOPROTOOPT;
1632
1633 if (get_user(len, optlen))
1634 return -EFAULT;
1635
1636 if (len < 0)
1637 return -EINVAL;
1638
1639 len = min_t(unsigned int, len, sizeof(int));
1640
1641 switch (optname) {
1642 case SO_IPRMDATA_MSG:
1643 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1644 break;
1645 case SO_MSGLIMIT:
1646 lock_sock(sk);
1647 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1648 : iucv->msglimit; /* default */
1649 release_sock(sk);
1650 break;
1651 case SO_MSGSIZE:
1652 if (sk->sk_state == IUCV_OPEN)
1653 return -EBADFD;
1654 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1655 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1656 0x7fffffff;
1657 break;
1658 default:
1659 return -ENOPROTOOPT;
1660 }
1661
1662 if (put_user(len, optlen))
1663 return -EFAULT;
1664 if (copy_to_user(optval, &val, len))
1665 return -EFAULT;
1666
1667 return 0;
1668 }
1669
1670
1671 /* Callback wrappers - called from iucv base support */
1672 static int iucv_callback_connreq(struct iucv_path *path,
1673 u8 ipvmid[8], u8 ipuser[16])
1674 {
1675 unsigned char user_data[16];
1676 unsigned char nuser_data[16];
1677 unsigned char src_name[8];
1678 struct sock *sk, *nsk;
1679 struct iucv_sock *iucv, *niucv;
1680 int err;
1681
1682 memcpy(src_name, ipuser, 8);
1683 EBCASC(src_name, 8);
1684 /* Find out if this path belongs to af_iucv. */
1685 read_lock(&iucv_sk_list.lock);
1686 iucv = NULL;
1687 sk = NULL;
1688 sk_for_each(sk, &iucv_sk_list.head)
1689 if (sk->sk_state == IUCV_LISTEN &&
1690 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1691 /*
1692 * Found a listening socket with
1693 * src_name == ipuser[0-7].
1694 */
1695 iucv = iucv_sk(sk);
1696 break;
1697 }
1698 read_unlock(&iucv_sk_list.lock);
1699 if (!iucv)
1700 /* No socket found, not one of our paths. */
1701 return -EINVAL;
1702
1703 bh_lock_sock(sk);
1704
1705 /* Check if parent socket is listening */
1706 low_nmcpy(user_data, iucv->src_name);
1707 high_nmcpy(user_data, iucv->dst_name);
1708 ASCEBC(user_data, sizeof(user_data));
1709 if (sk->sk_state != IUCV_LISTEN) {
1710 err = pr_iucv->path_sever(path, user_data);
1711 iucv_path_free(path);
1712 goto fail;
1713 }
1714
1715 /* Check for backlog size */
1716 if (sk_acceptq_is_full(sk)) {
1717 err = pr_iucv->path_sever(path, user_data);
1718 iucv_path_free(path);
1719 goto fail;
1720 }
1721
1722 /* Create the new socket */
1723 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1724 if (!nsk) {
1725 err = pr_iucv->path_sever(path, user_data);
1726 iucv_path_free(path);
1727 goto fail;
1728 }
1729
1730 niucv = iucv_sk(nsk);
1731 iucv_sock_init(nsk, sk);
1732
1733 /* Set the new iucv_sock */
1734 memcpy(niucv->dst_name, ipuser + 8, 8);
1735 EBCASC(niucv->dst_name, 8);
1736 memcpy(niucv->dst_user_id, ipvmid, 8);
1737 memcpy(niucv->src_name, iucv->src_name, 8);
1738 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1739 niucv->path = path;
1740
1741 /* Call iucv_accept */
1742 high_nmcpy(nuser_data, ipuser + 8);
1743 memcpy(nuser_data + 8, niucv->src_name, 8);
1744 ASCEBC(nuser_data + 8, 8);
1745
1746 /* set message limit for path based on msglimit of accepting socket */
1747 niucv->msglimit = iucv->msglimit;
1748 path->msglim = iucv->msglimit;
1749 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1750 if (err) {
1751 iucv_sever_path(nsk, 1);
1752 iucv_sock_kill(nsk);
1753 goto fail;
1754 }
1755
1756 iucv_accept_enqueue(sk, nsk);
1757
1758 /* Wake up accept */
1759 nsk->sk_state = IUCV_CONNECTED;
1760 sk->sk_data_ready(sk, 1);
1761 err = 0;
1762 fail:
1763 bh_unlock_sock(sk);
1764 return 0;
1765 }
1766
1767 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1768 {
1769 struct sock *sk = path->private;
1770
1771 sk->sk_state = IUCV_CONNECTED;
1772 sk->sk_state_change(sk);
1773 }
1774
1775 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1776 {
1777 struct sock *sk = path->private;
1778 struct iucv_sock *iucv = iucv_sk(sk);
1779 struct sk_buff *skb;
1780 struct sock_msg_q *save_msg;
1781 int len;
1782
1783 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1784 pr_iucv->message_reject(path, msg);
1785 return;
1786 }
1787
1788 spin_lock(&iucv->message_q.lock);
1789
1790 if (!list_empty(&iucv->message_q.list) ||
1791 !skb_queue_empty(&iucv->backlog_skb_q))
1792 goto save_message;
1793
1794 len = atomic_read(&sk->sk_rmem_alloc);
1795 len += SKB_TRUESIZE(iucv_msg_length(msg));
1796 if (len > sk->sk_rcvbuf)
1797 goto save_message;
1798
1799 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1800 if (!skb)
1801 goto save_message;
1802
1803 iucv_process_message(sk, skb, path, msg);
1804 goto out_unlock;
1805
1806 save_message:
1807 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1808 if (!save_msg)
1809 goto out_unlock;
1810 save_msg->path = path;
1811 save_msg->msg = *msg;
1812
1813 list_add_tail(&save_msg->list, &iucv->message_q.list);
1814
1815 out_unlock:
1816 spin_unlock(&iucv->message_q.lock);
1817 }
1818
1819 static void iucv_callback_txdone(struct iucv_path *path,
1820 struct iucv_message *msg)
1821 {
1822 struct sock *sk = path->private;
1823 struct sk_buff *this = NULL;
1824 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1825 struct sk_buff *list_skb = list->next;
1826 unsigned long flags;
1827
1828 bh_lock_sock(sk);
1829 if (!skb_queue_empty(list)) {
1830 spin_lock_irqsave(&list->lock, flags);
1831
1832 while (list_skb != (struct sk_buff *)list) {
1833 if (msg->tag != IUCV_SKB_CB(list_skb)->tag) {
1834 this = list_skb;
1835 break;
1836 }
1837 list_skb = list_skb->next;
1838 }
1839 if (this)
1840 __skb_unlink(this, list);
1841
1842 spin_unlock_irqrestore(&list->lock, flags);
1843
1844 if (this) {
1845 kfree_skb(this);
1846 /* wake up any process waiting for sending */
1847 iucv_sock_wake_msglim(sk);
1848 }
1849 }
1850
1851 if (sk->sk_state == IUCV_CLOSING) {
1852 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1853 sk->sk_state = IUCV_CLOSED;
1854 sk->sk_state_change(sk);
1855 }
1856 }
1857 bh_unlock_sock(sk);
1858
1859 }
1860
1861 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1862 {
1863 struct sock *sk = path->private;
1864
1865 if (sk->sk_state == IUCV_CLOSED)
1866 return;
1867
1868 bh_lock_sock(sk);
1869 iucv_sever_path(sk, 1);
1870 sk->sk_state = IUCV_DISCONN;
1871
1872 sk->sk_state_change(sk);
1873 bh_unlock_sock(sk);
1874 }
1875
1876 /* called if the other communication side shuts down its RECV direction;
1877 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1878 */
1879 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1880 {
1881 struct sock *sk = path->private;
1882
1883 bh_lock_sock(sk);
1884 if (sk->sk_state != IUCV_CLOSED) {
1885 sk->sk_shutdown |= SEND_SHUTDOWN;
1886 sk->sk_state_change(sk);
1887 }
1888 bh_unlock_sock(sk);
1889 }
1890
1891 /***************** HiperSockets transport callbacks ********************/
1892 static void afiucv_swap_src_dest(struct sk_buff *skb)
1893 {
1894 struct af_iucv_trans_hdr *trans_hdr =
1895 (struct af_iucv_trans_hdr *)skb->data;
1896 char tmpID[8];
1897 char tmpName[8];
1898
1899 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1900 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1901 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1902 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1903 memcpy(tmpID, trans_hdr->srcUserID, 8);
1904 memcpy(tmpName, trans_hdr->srcAppName, 8);
1905 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1906 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1907 memcpy(trans_hdr->destUserID, tmpID, 8);
1908 memcpy(trans_hdr->destAppName, tmpName, 8);
1909 skb_push(skb, ETH_HLEN);
1910 memset(skb->data, 0, ETH_HLEN);
1911 }
1912
1913 /**
1914 * afiucv_hs_callback_syn - react on received SYN
1915 **/
1916 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1917 {
1918 struct sock *nsk;
1919 struct iucv_sock *iucv, *niucv;
1920 struct af_iucv_trans_hdr *trans_hdr;
1921 int err;
1922
1923 iucv = iucv_sk(sk);
1924 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1925 if (!iucv) {
1926 /* no sock - connection refused */
1927 afiucv_swap_src_dest(skb);
1928 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1929 err = dev_queue_xmit(skb);
1930 goto out;
1931 }
1932
1933 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1934 bh_lock_sock(sk);
1935 if ((sk->sk_state != IUCV_LISTEN) ||
1936 sk_acceptq_is_full(sk) ||
1937 !nsk) {
1938 /* error on server socket - connection refused */
1939 if (nsk)
1940 sk_free(nsk);
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 bh_unlock_sock(sk);
1945 goto out;
1946 }
1947
1948 niucv = iucv_sk(nsk);
1949 iucv_sock_init(nsk, sk);
1950 niucv->transport = AF_IUCV_TRANS_HIPER;
1951 niucv->msglimit = iucv->msglimit;
1952 if (!trans_hdr->window)
1953 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1954 else
1955 niucv->msglimit_peer = trans_hdr->window;
1956 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1957 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1958 memcpy(niucv->src_name, iucv->src_name, 8);
1959 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1960 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1961 niucv->hs_dev = iucv->hs_dev;
1962 dev_hold(niucv->hs_dev);
1963 afiucv_swap_src_dest(skb);
1964 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1965 trans_hdr->window = niucv->msglimit;
1966 /* if receiver acks the xmit connection is established */
1967 err = dev_queue_xmit(skb);
1968 if (!err) {
1969 iucv_accept_enqueue(sk, nsk);
1970 nsk->sk_state = IUCV_CONNECTED;
1971 sk->sk_data_ready(sk, 1);
1972 } else
1973 iucv_sock_kill(nsk);
1974 bh_unlock_sock(sk);
1975
1976 out:
1977 return NET_RX_SUCCESS;
1978 }
1979
1980 /**
1981 * afiucv_hs_callback_synack() - react on received SYN-ACK
1982 **/
1983 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1984 {
1985 struct iucv_sock *iucv = iucv_sk(sk);
1986 struct af_iucv_trans_hdr *trans_hdr =
1987 (struct af_iucv_trans_hdr *)skb->data;
1988
1989 if (!iucv)
1990 goto out;
1991 if (sk->sk_state != IUCV_BOUND)
1992 goto out;
1993 bh_lock_sock(sk);
1994 iucv->msglimit_peer = trans_hdr->window;
1995 sk->sk_state = IUCV_CONNECTED;
1996 sk->sk_state_change(sk);
1997 bh_unlock_sock(sk);
1998 out:
1999 kfree_skb(skb);
2000 return NET_RX_SUCCESS;
2001 }
2002
2003 /**
2004 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2005 **/
2006 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2007 {
2008 struct iucv_sock *iucv = iucv_sk(sk);
2009
2010 if (!iucv)
2011 goto out;
2012 if (sk->sk_state != IUCV_BOUND)
2013 goto out;
2014 bh_lock_sock(sk);
2015 sk->sk_state = IUCV_DISCONN;
2016 sk->sk_state_change(sk);
2017 bh_unlock_sock(sk);
2018 out:
2019 kfree_skb(skb);
2020 return NET_RX_SUCCESS;
2021 }
2022
2023 /**
2024 * afiucv_hs_callback_fin() - react on received FIN
2025 **/
2026 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2027 {
2028 struct iucv_sock *iucv = iucv_sk(sk);
2029
2030 /* other end of connection closed */
2031 if (!iucv)
2032 goto out;
2033 bh_lock_sock(sk);
2034 if (sk->sk_state == IUCV_CONNECTED) {
2035 sk->sk_state = IUCV_DISCONN;
2036 sk->sk_state_change(sk);
2037 }
2038 bh_unlock_sock(sk);
2039 out:
2040 kfree_skb(skb);
2041 return NET_RX_SUCCESS;
2042 }
2043
2044 /**
2045 * afiucv_hs_callback_win() - react on received WIN
2046 **/
2047 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2048 {
2049 struct iucv_sock *iucv = iucv_sk(sk);
2050 struct af_iucv_trans_hdr *trans_hdr =
2051 (struct af_iucv_trans_hdr *)skb->data;
2052
2053 if (!iucv)
2054 return NET_RX_SUCCESS;
2055
2056 if (sk->sk_state != IUCV_CONNECTED)
2057 return NET_RX_SUCCESS;
2058
2059 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2060 iucv_sock_wake_msglim(sk);
2061 return NET_RX_SUCCESS;
2062 }
2063
2064 /**
2065 * afiucv_hs_callback_rx() - react on received data
2066 **/
2067 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2068 {
2069 struct iucv_sock *iucv = iucv_sk(sk);
2070
2071 if (!iucv) {
2072 kfree_skb(skb);
2073 return NET_RX_SUCCESS;
2074 }
2075
2076 if (sk->sk_state != IUCV_CONNECTED) {
2077 kfree_skb(skb);
2078 return NET_RX_SUCCESS;
2079 }
2080
2081 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2082 kfree_skb(skb);
2083 return NET_RX_SUCCESS;
2084 }
2085
2086 /* write stuff from iucv_msg to skb cb */
2087 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2088 kfree_skb(skb);
2089 return NET_RX_SUCCESS;
2090 }
2091 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2092 skb_reset_transport_header(skb);
2093 skb_reset_network_header(skb);
2094 IUCV_SKB_CB(skb)->offset = 0;
2095 spin_lock(&iucv->message_q.lock);
2096 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2097 if (sock_queue_rcv_skb(sk, skb)) {
2098 /* handle rcv queue full */
2099 skb_queue_tail(&iucv->backlog_skb_q, skb);
2100 }
2101 } else
2102 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2103 spin_unlock(&iucv->message_q.lock);
2104 return NET_RX_SUCCESS;
2105 }
2106
2107 /**
2108 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2109 * transport
2110 * called from netif RX softirq
2111 **/
2112 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2113 struct packet_type *pt, struct net_device *orig_dev)
2114 {
2115 struct sock *sk;
2116 struct iucv_sock *iucv;
2117 struct af_iucv_trans_hdr *trans_hdr;
2118 char nullstring[8];
2119 int err = 0;
2120
2121 skb_pull(skb, ETH_HLEN);
2122 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2123 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2124 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2125 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2126 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2127 memset(nullstring, 0, sizeof(nullstring));
2128 iucv = NULL;
2129 sk = NULL;
2130 read_lock(&iucv_sk_list.lock);
2131 sk_for_each(sk, &iucv_sk_list.head) {
2132 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2133 if ((!memcmp(&iucv_sk(sk)->src_name,
2134 trans_hdr->destAppName, 8)) &&
2135 (!memcmp(&iucv_sk(sk)->src_user_id,
2136 trans_hdr->destUserID, 8)) &&
2137 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2138 (!memcmp(&iucv_sk(sk)->dst_user_id,
2139 nullstring, 8))) {
2140 iucv = iucv_sk(sk);
2141 break;
2142 }
2143 } else {
2144 if ((!memcmp(&iucv_sk(sk)->src_name,
2145 trans_hdr->destAppName, 8)) &&
2146 (!memcmp(&iucv_sk(sk)->src_user_id,
2147 trans_hdr->destUserID, 8)) &&
2148 (!memcmp(&iucv_sk(sk)->dst_name,
2149 trans_hdr->srcAppName, 8)) &&
2150 (!memcmp(&iucv_sk(sk)->dst_user_id,
2151 trans_hdr->srcUserID, 8))) {
2152 iucv = iucv_sk(sk);
2153 break;
2154 }
2155 }
2156 }
2157 read_unlock(&iucv_sk_list.lock);
2158 if (!iucv)
2159 sk = NULL;
2160
2161 /* no sock
2162 how should we send with no sock
2163 1) send without sock no send rc checking?
2164 2) introduce default sock to handle this cases
2165
2166 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2167 data -> send FIN
2168 SYN|ACK, SYN|FIN, FIN -> no action? */
2169
2170 switch (trans_hdr->flags) {
2171 case AF_IUCV_FLAG_SYN:
2172 /* connect request */
2173 err = afiucv_hs_callback_syn(sk, skb);
2174 break;
2175 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2176 /* connect request confirmed */
2177 err = afiucv_hs_callback_synack(sk, skb);
2178 break;
2179 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2180 /* connect request refused */
2181 err = afiucv_hs_callback_synfin(sk, skb);
2182 break;
2183 case (AF_IUCV_FLAG_FIN):
2184 /* close request */
2185 err = afiucv_hs_callback_fin(sk, skb);
2186 break;
2187 case (AF_IUCV_FLAG_WIN):
2188 err = afiucv_hs_callback_win(sk, skb);
2189 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2190 kfree_skb(skb);
2191 break;
2192 }
2193 /* fall through and receive non-zero length data */
2194 case (AF_IUCV_FLAG_SHT):
2195 /* shutdown request */
2196 /* fall through and receive zero length data */
2197 case 0:
2198 /* plain data frame */
2199 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2200 err = afiucv_hs_callback_rx(sk, skb);
2201 break;
2202 default:
2203 ;
2204 }
2205
2206 return err;
2207 }
2208
2209 /**
2210 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2211 * transport
2212 **/
2213 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2214 enum iucv_tx_notify n)
2215 {
2216 struct sock *isk = skb->sk;
2217 struct sock *sk = NULL;
2218 struct iucv_sock *iucv = NULL;
2219 struct sk_buff_head *list;
2220 struct sk_buff *list_skb;
2221 struct sk_buff *nskb;
2222 unsigned long flags;
2223
2224 read_lock_irqsave(&iucv_sk_list.lock, flags);
2225 sk_for_each(sk, &iucv_sk_list.head)
2226 if (sk == isk) {
2227 iucv = iucv_sk(sk);
2228 break;
2229 }
2230 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2231
2232 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2233 return;
2234
2235 list = &iucv->send_skb_q;
2236 spin_lock_irqsave(&list->lock, flags);
2237 if (skb_queue_empty(list))
2238 goto out_unlock;
2239 list_skb = list->next;
2240 nskb = list_skb->next;
2241 while (list_skb != (struct sk_buff *)list) {
2242 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2243 switch (n) {
2244 case TX_NOTIFY_OK:
2245 __skb_unlink(list_skb, list);
2246 kfree_skb(list_skb);
2247 iucv_sock_wake_msglim(sk);
2248 break;
2249 case TX_NOTIFY_PENDING:
2250 atomic_inc(&iucv->pendings);
2251 break;
2252 case TX_NOTIFY_DELAYED_OK:
2253 __skb_unlink(list_skb, list);
2254 atomic_dec(&iucv->pendings);
2255 if (atomic_read(&iucv->pendings) <= 0)
2256 iucv_sock_wake_msglim(sk);
2257 kfree_skb(list_skb);
2258 break;
2259 case TX_NOTIFY_UNREACHABLE:
2260 case TX_NOTIFY_DELAYED_UNREACHABLE:
2261 case TX_NOTIFY_TPQFULL: /* not yet used */
2262 case TX_NOTIFY_GENERALERROR:
2263 case TX_NOTIFY_DELAYED_GENERALERROR:
2264 __skb_unlink(list_skb, list);
2265 kfree_skb(list_skb);
2266 if (sk->sk_state == IUCV_CONNECTED) {
2267 sk->sk_state = IUCV_DISCONN;
2268 sk->sk_state_change(sk);
2269 }
2270 break;
2271 }
2272 break;
2273 }
2274 list_skb = nskb;
2275 nskb = nskb->next;
2276 }
2277 out_unlock:
2278 spin_unlock_irqrestore(&list->lock, flags);
2279
2280 if (sk->sk_state == IUCV_CLOSING) {
2281 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2282 sk->sk_state = IUCV_CLOSED;
2283 sk->sk_state_change(sk);
2284 }
2285 }
2286
2287 }
2288
2289 /*
2290 * afiucv_netdev_event: handle netdev notifier chain events
2291 */
2292 static int afiucv_netdev_event(struct notifier_block *this,
2293 unsigned long event, void *ptr)
2294 {
2295 struct net_device *event_dev = (struct net_device *)ptr;
2296 struct sock *sk;
2297 struct iucv_sock *iucv;
2298
2299 switch (event) {
2300 case NETDEV_REBOOT:
2301 case NETDEV_GOING_DOWN:
2302 sk_for_each(sk, &iucv_sk_list.head) {
2303 iucv = iucv_sk(sk);
2304 if ((iucv->hs_dev == event_dev) &&
2305 (sk->sk_state == IUCV_CONNECTED)) {
2306 if (event == NETDEV_GOING_DOWN)
2307 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2308 sk->sk_state = IUCV_DISCONN;
2309 sk->sk_state_change(sk);
2310 }
2311 }
2312 break;
2313 case NETDEV_DOWN:
2314 case NETDEV_UNREGISTER:
2315 default:
2316 break;
2317 }
2318 return NOTIFY_DONE;
2319 }
2320
2321 static struct notifier_block afiucv_netdev_notifier = {
2322 .notifier_call = afiucv_netdev_event,
2323 };
2324
2325 static const struct proto_ops iucv_sock_ops = {
2326 .family = PF_IUCV,
2327 .owner = THIS_MODULE,
2328 .release = iucv_sock_release,
2329 .bind = iucv_sock_bind,
2330 .connect = iucv_sock_connect,
2331 .listen = iucv_sock_listen,
2332 .accept = iucv_sock_accept,
2333 .getname = iucv_sock_getname,
2334 .sendmsg = iucv_sock_sendmsg,
2335 .recvmsg = iucv_sock_recvmsg,
2336 .poll = iucv_sock_poll,
2337 .ioctl = sock_no_ioctl,
2338 .mmap = sock_no_mmap,
2339 .socketpair = sock_no_socketpair,
2340 .shutdown = iucv_sock_shutdown,
2341 .setsockopt = iucv_sock_setsockopt,
2342 .getsockopt = iucv_sock_getsockopt,
2343 };
2344
2345 static const struct net_proto_family iucv_sock_family_ops = {
2346 .family = AF_IUCV,
2347 .owner = THIS_MODULE,
2348 .create = iucv_sock_create,
2349 };
2350
2351 static struct packet_type iucv_packet_type = {
2352 .type = cpu_to_be16(ETH_P_AF_IUCV),
2353 .func = afiucv_hs_rcv,
2354 };
2355
2356 static int afiucv_iucv_init(void)
2357 {
2358 int err;
2359
2360 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2361 if (err)
2362 goto out;
2363 /* establish dummy device */
2364 af_iucv_driver.bus = pr_iucv->bus;
2365 err = driver_register(&af_iucv_driver);
2366 if (err)
2367 goto out_iucv;
2368 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2369 if (!af_iucv_dev) {
2370 err = -ENOMEM;
2371 goto out_driver;
2372 }
2373 dev_set_name(af_iucv_dev, "af_iucv");
2374 af_iucv_dev->bus = pr_iucv->bus;
2375 af_iucv_dev->parent = pr_iucv->root;
2376 af_iucv_dev->release = (void (*)(struct device *))kfree;
2377 af_iucv_dev->driver = &af_iucv_driver;
2378 err = device_register(af_iucv_dev);
2379 if (err)
2380 goto out_driver;
2381 return 0;
2382
2383 out_driver:
2384 driver_unregister(&af_iucv_driver);
2385 out_iucv:
2386 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2387 out:
2388 return err;
2389 }
2390
2391 static int __init afiucv_init(void)
2392 {
2393 int err;
2394
2395 if (MACHINE_IS_VM) {
2396 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2397 if (unlikely(err)) {
2398 WARN_ON(err);
2399 err = -EPROTONOSUPPORT;
2400 goto out;
2401 }
2402
2403 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2404 if (!pr_iucv) {
2405 printk(KERN_WARNING "iucv_if lookup failed\n");
2406 memset(&iucv_userid, 0, sizeof(iucv_userid));
2407 }
2408 } else {
2409 memset(&iucv_userid, 0, sizeof(iucv_userid));
2410 pr_iucv = NULL;
2411 }
2412
2413 err = proto_register(&iucv_proto, 0);
2414 if (err)
2415 goto out;
2416 err = sock_register(&iucv_sock_family_ops);
2417 if (err)
2418 goto out_proto;
2419
2420 if (pr_iucv) {
2421 err = afiucv_iucv_init();
2422 if (err)
2423 goto out_sock;
2424 } else
2425 register_netdevice_notifier(&afiucv_netdev_notifier);
2426 dev_add_pack(&iucv_packet_type);
2427 return 0;
2428
2429 out_sock:
2430 sock_unregister(PF_IUCV);
2431 out_proto:
2432 proto_unregister(&iucv_proto);
2433 out:
2434 if (pr_iucv)
2435 symbol_put(iucv_if);
2436 return err;
2437 }
2438
2439 static void __exit afiucv_exit(void)
2440 {
2441 if (pr_iucv) {
2442 device_unregister(af_iucv_dev);
2443 driver_unregister(&af_iucv_driver);
2444 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2445 symbol_put(iucv_if);
2446 } else
2447 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2448 dev_remove_pack(&iucv_packet_type);
2449 sock_unregister(PF_IUCV);
2450 proto_unregister(&iucv_proto);
2451 }
2452
2453 module_init(afiucv_init);
2454 module_exit(afiucv_exit);
2455
2456 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2457 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2458 MODULE_VERSION(VERSION);
2459 MODULE_LICENSE("GPL");
2460 MODULE_ALIAS_NETPROTO(PF_IUCV);
2461
kernel source for telekom puls (alcatel/mediatek)