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net: Implement register_net_sysctl.
[linux-2.6/cjktty.git] / net / iucv / af_iucv.c
blob07d7d55a1b93af13013b23c361d8c2f7ff8382aa
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 /* macros to set/get socket control buffer at correct offset */
53 #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */
54 #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag))
55 #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
56 #define CB_TRGCLS_LEN (TRGCLS_SIZE)
57
58 #define __iucv_sock_wait(sk, condition, timeo, ret) \
59 do { \
60 DEFINE_WAIT(__wait); \
61 long __timeo = timeo; \
62 ret = 0; \
63 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
64 while (!(condition)) { \
65 if (!__timeo) { \
66 ret = -EAGAIN; \
67 break; \
68 } \
69 if (signal_pending(current)) { \
70 ret = sock_intr_errno(__timeo); \
71 break; \
72 } \
73 release_sock(sk); \
74 __timeo = schedule_timeout(__timeo); \
75 lock_sock(sk); \
76 ret = sock_error(sk); \
77 if (ret) \
78 break; \
79 } \
80 finish_wait(sk_sleep(sk), &__wait); \
81 } while (0)
82
83 #define iucv_sock_wait(sk, condition, timeo) \
84 ({ \
85 int __ret = 0; \
86 if (!(condition)) \
87 __iucv_sock_wait(sk, condition, timeo, __ret); \
88 __ret; \
89 })
90
91 static void iucv_sock_kill(struct sock *sk);
92 static void iucv_sock_close(struct sock *sk);
93 static void iucv_sever_path(struct sock *, int);
94
95 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
96 struct packet_type *pt, struct net_device *orig_dev);
97 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
98 struct sk_buff *skb, u8 flags);
99 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
100
101 /* Call Back functions */
102 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
103 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
104 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
105 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
106 u8 ipuser[16]);
107 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
108 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
109
110 static struct iucv_sock_list iucv_sk_list = {
111 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
112 .autobind_name = ATOMIC_INIT(0)
113 };
114
115 static struct iucv_handler af_iucv_handler = {
116 .path_pending = iucv_callback_connreq,
117 .path_complete = iucv_callback_connack,
118 .path_severed = iucv_callback_connrej,
119 .message_pending = iucv_callback_rx,
120 .message_complete = iucv_callback_txdone,
121 .path_quiesced = iucv_callback_shutdown,
122 };
123
124 static inline void high_nmcpy(unsigned char *dst, char *src)
125 {
126 memcpy(dst, src, 8);
127 }
128
129 static inline void low_nmcpy(unsigned char *dst, char *src)
130 {
131 memcpy(&dst[8], src, 8);
132 }
133
134 static int afiucv_pm_prepare(struct device *dev)
135 {
136 #ifdef CONFIG_PM_DEBUG
137 printk(KERN_WARNING "afiucv_pm_prepare\n");
138 #endif
139 return 0;
140 }
141
142 static void afiucv_pm_complete(struct device *dev)
143 {
144 #ifdef CONFIG_PM_DEBUG
145 printk(KERN_WARNING "afiucv_pm_complete\n");
146 #endif
147 }
148
149 /**
150 * afiucv_pm_freeze() - Freeze PM callback
151 * @dev: AFIUCV dummy device
152 *
153 * Sever all established IUCV communication pathes
154 */
155 static int afiucv_pm_freeze(struct device *dev)
156 {
157 struct iucv_sock *iucv;
158 struct sock *sk;
159 struct hlist_node *node;
160 int err = 0;
161
162 #ifdef CONFIG_PM_DEBUG
163 printk(KERN_WARNING "afiucv_pm_freeze\n");
164 #endif
165 read_lock(&iucv_sk_list.lock);
166 sk_for_each(sk, node, &iucv_sk_list.head) {
167 iucv = iucv_sk(sk);
168 switch (sk->sk_state) {
169 case IUCV_DISCONN:
170 case IUCV_CLOSING:
171 case IUCV_CONNECTED:
172 iucv_sever_path(sk, 0);
173 break;
174 case IUCV_OPEN:
175 case IUCV_BOUND:
176 case IUCV_LISTEN:
177 case IUCV_CLOSED:
178 default:
179 break;
180 }
181 skb_queue_purge(&iucv->send_skb_q);
182 skb_queue_purge(&iucv->backlog_skb_q);
183 }
184 read_unlock(&iucv_sk_list.lock);
185 return err;
186 }
187
188 /**
189 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
190 * @dev: AFIUCV dummy device
191 *
192 * socket clean up after freeze
193 */
194 static int afiucv_pm_restore_thaw(struct device *dev)
195 {
196 struct sock *sk;
197 struct hlist_node *node;
198
199 #ifdef CONFIG_PM_DEBUG
200 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
201 #endif
202 read_lock(&iucv_sk_list.lock);
203 sk_for_each(sk, node, &iucv_sk_list.head) {
204 switch (sk->sk_state) {
205 case IUCV_CONNECTED:
206 sk->sk_err = EPIPE;
207 sk->sk_state = IUCV_DISCONN;
208 sk->sk_state_change(sk);
209 break;
210 case IUCV_DISCONN:
211 case IUCV_CLOSING:
212 case IUCV_LISTEN:
213 case IUCV_BOUND:
214 case IUCV_OPEN:
215 default:
216 break;
217 }
218 }
219 read_unlock(&iucv_sk_list.lock);
220 return 0;
221 }
222
223 static const struct dev_pm_ops afiucv_pm_ops = {
224 .prepare = afiucv_pm_prepare,
225 .complete = afiucv_pm_complete,
226 .freeze = afiucv_pm_freeze,
227 .thaw = afiucv_pm_restore_thaw,
228 .restore = afiucv_pm_restore_thaw,
229 };
230
231 static struct device_driver af_iucv_driver = {
232 .owner = THIS_MODULE,
233 .name = "afiucv",
234 .bus = NULL,
235 .pm = &afiucv_pm_ops,
236 };
237
238 /* dummy device used as trigger for PM functions */
239 static struct device *af_iucv_dev;
240
241 /**
242 * iucv_msg_length() - Returns the length of an iucv message.
243 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
244 *
245 * The function returns the length of the specified iucv message @msg of data
246 * stored in a buffer and of data stored in the parameter list (PRMDATA).
247 *
248 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
249 * data:
250 * PRMDATA[0..6] socket data (max 7 bytes);
251 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
252 *
253 * The socket data length is computed by subtracting the socket data length
254 * value from 0xFF.
255 * If the socket data len is greater 7, then PRMDATA can be used for special
256 * notifications (see iucv_sock_shutdown); and further,
257 * if the socket data len is > 7, the function returns 8.
258 *
259 * Use this function to allocate socket buffers to store iucv message data.
260 */
261 static inline size_t iucv_msg_length(struct iucv_message *msg)
262 {
263 size_t datalen;
264
265 if (msg->flags & IUCV_IPRMDATA) {
266 datalen = 0xff - msg->rmmsg[7];
267 return (datalen < 8) ? datalen : 8;
268 }
269 return msg->length;
270 }
271
272 /**
273 * iucv_sock_in_state() - check for specific states
274 * @sk: sock structure
275 * @state: first iucv sk state
276 * @state: second iucv sk state
277 *
278 * Returns true if the socket in either in the first or second state.
279 */
280 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
281 {
282 return (sk->sk_state == state || sk->sk_state == state2);
283 }
284
285 /**
286 * iucv_below_msglim() - function to check if messages can be sent
287 * @sk: sock structure
288 *
289 * Returns true if the send queue length is lower than the message limit.
290 * Always returns true if the socket is not connected (no iucv path for
291 * checking the message limit).
292 */
293 static inline int iucv_below_msglim(struct sock *sk)
294 {
295 struct iucv_sock *iucv = iucv_sk(sk);
296
297 if (sk->sk_state != IUCV_CONNECTED)
298 return 1;
299 if (iucv->transport == AF_IUCV_TRANS_IUCV)
300 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
301 else
302 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
303 (atomic_read(&iucv->pendings) <= 0));
304 }
305
306 /**
307 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
308 */
309 static void iucv_sock_wake_msglim(struct sock *sk)
310 {
311 struct socket_wq *wq;
312
313 rcu_read_lock();
314 wq = rcu_dereference(sk->sk_wq);
315 if (wq_has_sleeper(wq))
316 wake_up_interruptible_all(&wq->wait);
317 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
318 rcu_read_unlock();
319 }
320
321 /**
322 * afiucv_hs_send() - send a message through HiperSockets transport
323 */
324 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
325 struct sk_buff *skb, u8 flags)
326 {
327 struct iucv_sock *iucv = iucv_sk(sock);
328 struct af_iucv_trans_hdr *phs_hdr;
329 struct sk_buff *nskb;
330 int err, confirm_recv = 0;
331
332 memset(skb->head, 0, ETH_HLEN);
333 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
334 sizeof(struct af_iucv_trans_hdr));
335 skb_reset_mac_header(skb);
336 skb_reset_network_header(skb);
337 skb_push(skb, ETH_HLEN);
338 skb_reset_mac_header(skb);
339 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
340
341 phs_hdr->magic = ETH_P_AF_IUCV;
342 phs_hdr->version = 1;
343 phs_hdr->flags = flags;
344 if (flags == AF_IUCV_FLAG_SYN)
345 phs_hdr->window = iucv->msglimit;
346 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
347 confirm_recv = atomic_read(&iucv->msg_recv);
348 phs_hdr->window = confirm_recv;
349 if (confirm_recv)
350 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
351 }
352 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
353 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
354 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
355 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
356 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
357 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
358 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
359 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
360 if (imsg)
361 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
362
363 skb->dev = iucv->hs_dev;
364 if (!skb->dev)
365 return -ENODEV;
366 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
367 return -ENETDOWN;
368 if (skb->len > skb->dev->mtu) {
369 if (sock->sk_type == SOCK_SEQPACKET)
370 return -EMSGSIZE;
371 else
372 skb_trim(skb, skb->dev->mtu);
373 }
374 skb->protocol = ETH_P_AF_IUCV;
375 skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF;
376 nskb = skb_clone(skb, GFP_ATOMIC);
377 if (!nskb)
378 return -ENOMEM;
379 skb_queue_tail(&iucv->send_skb_q, nskb);
380 err = dev_queue_xmit(skb);
381 if (net_xmit_eval(err)) {
382 skb_unlink(nskb, &iucv->send_skb_q);
383 kfree_skb(nskb);
384 } else {
385 atomic_sub(confirm_recv, &iucv->msg_recv);
386 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
387 }
388 return net_xmit_eval(err);
389 }
390
391 static struct sock *__iucv_get_sock_by_name(char *nm)
392 {
393 struct sock *sk;
394 struct hlist_node *node;
395
396 sk_for_each(sk, node, &iucv_sk_list.head)
397 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
398 return sk;
399
400 return NULL;
401 }
402
403 static void iucv_sock_destruct(struct sock *sk)
404 {
405 skb_queue_purge(&sk->sk_receive_queue);
406 skb_queue_purge(&sk->sk_error_queue);
407
408 sk_mem_reclaim(sk);
409
410 if (!sock_flag(sk, SOCK_DEAD)) {
411 pr_err("Attempt to release alive iucv socket %p\n", sk);
412 return;
413 }
414
415 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
416 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
417 WARN_ON(sk->sk_wmem_queued);
418 WARN_ON(sk->sk_forward_alloc);
419 }
420
421 /* Cleanup Listen */
422 static void iucv_sock_cleanup_listen(struct sock *parent)
423 {
424 struct sock *sk;
425
426 /* Close non-accepted connections */
427 while ((sk = iucv_accept_dequeue(parent, NULL))) {
428 iucv_sock_close(sk);
429 iucv_sock_kill(sk);
430 }
431
432 parent->sk_state = IUCV_CLOSED;
433 }
434
435 /* Kill socket (only if zapped and orphaned) */
436 static void iucv_sock_kill(struct sock *sk)
437 {
438 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
439 return;
440
441 iucv_sock_unlink(&iucv_sk_list, sk);
442 sock_set_flag(sk, SOCK_DEAD);
443 sock_put(sk);
444 }
445
446 /* Terminate an IUCV path */
447 static void iucv_sever_path(struct sock *sk, int with_user_data)
448 {
449 unsigned char user_data[16];
450 struct iucv_sock *iucv = iucv_sk(sk);
451 struct iucv_path *path = iucv->path;
452
453 if (iucv->path) {
454 iucv->path = NULL;
455 if (with_user_data) {
456 low_nmcpy(user_data, iucv->src_name);
457 high_nmcpy(user_data, iucv->dst_name);
458 ASCEBC(user_data, sizeof(user_data));
459 pr_iucv->path_sever(path, user_data);
460 } else
461 pr_iucv->path_sever(path, NULL);
462 iucv_path_free(path);
463 }
464 }
465
466 /* Send FIN through an IUCV socket for HIPER transport */
467 static int iucv_send_ctrl(struct sock *sk, u8 flags)
468 {
469 int err = 0;
470 int blen;
471 struct sk_buff *skb;
472
473 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
474 skb = sock_alloc_send_skb(sk, blen, 1, &err);
475 if (skb) {
476 skb_reserve(skb, blen);
477 err = afiucv_hs_send(NULL, sk, skb, flags);
478 }
479 return err;
480 }
481
482 /* Close an IUCV socket */
483 static void iucv_sock_close(struct sock *sk)
484 {
485 struct iucv_sock *iucv = iucv_sk(sk);
486 unsigned long timeo;
487 int err = 0;
488
489 lock_sock(sk);
490
491 switch (sk->sk_state) {
492 case IUCV_LISTEN:
493 iucv_sock_cleanup_listen(sk);
494 break;
495
496 case IUCV_CONNECTED:
497 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
498 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
499 sk->sk_state = IUCV_DISCONN;
500 sk->sk_state_change(sk);
501 }
502 case IUCV_DISCONN: /* fall through */
503 sk->sk_state = IUCV_CLOSING;
504 sk->sk_state_change(sk);
505
506 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
507 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
508 timeo = sk->sk_lingertime;
509 else
510 timeo = IUCV_DISCONN_TIMEOUT;
511 iucv_sock_wait(sk,
512 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
513 timeo);
514 }
515
516 case IUCV_CLOSING: /* fall through */
517 sk->sk_state = IUCV_CLOSED;
518 sk->sk_state_change(sk);
519
520 sk->sk_err = ECONNRESET;
521 sk->sk_state_change(sk);
522
523 skb_queue_purge(&iucv->send_skb_q);
524 skb_queue_purge(&iucv->backlog_skb_q);
525
526 default: /* fall through */
527 iucv_sever_path(sk, 1);
528 }
529
530 if (iucv->hs_dev) {
531 dev_put(iucv->hs_dev);
532 iucv->hs_dev = NULL;
533 sk->sk_bound_dev_if = 0;
534 }
535
536 /* mark socket for deletion by iucv_sock_kill() */
537 sock_set_flag(sk, SOCK_ZAPPED);
538
539 release_sock(sk);
540 }
541
542 static void iucv_sock_init(struct sock *sk, struct sock *parent)
543 {
544 if (parent)
545 sk->sk_type = parent->sk_type;
546 }
547
548 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
549 {
550 struct sock *sk;
551 struct iucv_sock *iucv;
552
553 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
554 if (!sk)
555 return NULL;
556 iucv = iucv_sk(sk);
557
558 sock_init_data(sock, sk);
559 INIT_LIST_HEAD(&iucv->accept_q);
560 spin_lock_init(&iucv->accept_q_lock);
561 skb_queue_head_init(&iucv->send_skb_q);
562 INIT_LIST_HEAD(&iucv->message_q.list);
563 spin_lock_init(&iucv->message_q.lock);
564 skb_queue_head_init(&iucv->backlog_skb_q);
565 iucv->send_tag = 0;
566 atomic_set(&iucv->pendings, 0);
567 iucv->flags = 0;
568 iucv->msglimit = 0;
569 atomic_set(&iucv->msg_sent, 0);
570 atomic_set(&iucv->msg_recv, 0);
571 iucv->path = NULL;
572 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
573 memset(&iucv->src_user_id , 0, 32);
574 if (pr_iucv)
575 iucv->transport = AF_IUCV_TRANS_IUCV;
576 else
577 iucv->transport = AF_IUCV_TRANS_HIPER;
578
579 sk->sk_destruct = iucv_sock_destruct;
580 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
581 sk->sk_allocation = GFP_DMA;
582
583 sock_reset_flag(sk, SOCK_ZAPPED);
584
585 sk->sk_protocol = proto;
586 sk->sk_state = IUCV_OPEN;
587
588 iucv_sock_link(&iucv_sk_list, sk);
589 return sk;
590 }
591
592 /* Create an IUCV socket */
593 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
594 int kern)
595 {
596 struct sock *sk;
597
598 if (protocol && protocol != PF_IUCV)
599 return -EPROTONOSUPPORT;
600
601 sock->state = SS_UNCONNECTED;
602
603 switch (sock->type) {
604 case SOCK_STREAM:
605 sock->ops = &iucv_sock_ops;
606 break;
607 case SOCK_SEQPACKET:
608 /* currently, proto ops can handle both sk types */
609 sock->ops = &iucv_sock_ops;
610 break;
611 default:
612 return -ESOCKTNOSUPPORT;
613 }
614
615 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
616 if (!sk)
617 return -ENOMEM;
618
619 iucv_sock_init(sk, NULL);
620
621 return 0;
622 }
623
624 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
625 {
626 write_lock_bh(&l->lock);
627 sk_add_node(sk, &l->head);
628 write_unlock_bh(&l->lock);
629 }
630
631 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
632 {
633 write_lock_bh(&l->lock);
634 sk_del_node_init(sk);
635 write_unlock_bh(&l->lock);
636 }
637
638 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
639 {
640 unsigned long flags;
641 struct iucv_sock *par = iucv_sk(parent);
642
643 sock_hold(sk);
644 spin_lock_irqsave(&par->accept_q_lock, flags);
645 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
646 spin_unlock_irqrestore(&par->accept_q_lock, flags);
647 iucv_sk(sk)->parent = parent;
648 sk_acceptq_added(parent);
649 }
650
651 void iucv_accept_unlink(struct sock *sk)
652 {
653 unsigned long flags;
654 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
655
656 spin_lock_irqsave(&par->accept_q_lock, flags);
657 list_del_init(&iucv_sk(sk)->accept_q);
658 spin_unlock_irqrestore(&par->accept_q_lock, flags);
659 sk_acceptq_removed(iucv_sk(sk)->parent);
660 iucv_sk(sk)->parent = NULL;
661 sock_put(sk);
662 }
663
664 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
665 {
666 struct iucv_sock *isk, *n;
667 struct sock *sk;
668
669 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
670 sk = (struct sock *) isk;
671 lock_sock(sk);
672
673 if (sk->sk_state == IUCV_CLOSED) {
674 iucv_accept_unlink(sk);
675 release_sock(sk);
676 continue;
677 }
678
679 if (sk->sk_state == IUCV_CONNECTED ||
680 sk->sk_state == IUCV_DISCONN ||
681 !newsock) {
682 iucv_accept_unlink(sk);
683 if (newsock)
684 sock_graft(sk, newsock);
685
686 release_sock(sk);
687 return sk;
688 }
689
690 release_sock(sk);
691 }
692 return NULL;
693 }
694
695 /* Bind an unbound socket */
696 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
697 int addr_len)
698 {
699 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
700 struct sock *sk = sock->sk;
701 struct iucv_sock *iucv;
702 int err = 0;
703 struct net_device *dev;
704 char uid[9];
705
706 /* Verify the input sockaddr */
707 if (!addr || addr->sa_family != AF_IUCV)
708 return -EINVAL;
709
710 lock_sock(sk);
711 if (sk->sk_state != IUCV_OPEN) {
712 err = -EBADFD;
713 goto done;
714 }
715
716 write_lock_bh(&iucv_sk_list.lock);
717
718 iucv = iucv_sk(sk);
719 if (__iucv_get_sock_by_name(sa->siucv_name)) {
720 err = -EADDRINUSE;
721 goto done_unlock;
722 }
723 if (iucv->path)
724 goto done_unlock;
725
726 /* Bind the socket */
727 if (pr_iucv)
728 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
729 goto vm_bind; /* VM IUCV transport */
730
731 /* try hiper transport */
732 memcpy(uid, sa->siucv_user_id, sizeof(uid));
733 ASCEBC(uid, 8);
734 rcu_read_lock();
735 for_each_netdev_rcu(&init_net, dev) {
736 if (!memcmp(dev->perm_addr, uid, 8)) {
737 memcpy(iucv->src_name, sa->siucv_name, 8);
738 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
739 sk->sk_bound_dev_if = dev->ifindex;
740 iucv->hs_dev = dev;
741 dev_hold(dev);
742 sk->sk_state = IUCV_BOUND;
743 iucv->transport = AF_IUCV_TRANS_HIPER;
744 if (!iucv->msglimit)
745 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
746 rcu_read_unlock();
747 goto done_unlock;
748 }
749 }
750 rcu_read_unlock();
751 vm_bind:
752 if (pr_iucv) {
753 /* use local userid for backward compat */
754 memcpy(iucv->src_name, sa->siucv_name, 8);
755 memcpy(iucv->src_user_id, iucv_userid, 8);
756 sk->sk_state = IUCV_BOUND;
757 iucv->transport = AF_IUCV_TRANS_IUCV;
758 if (!iucv->msglimit)
759 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
760 goto done_unlock;
761 }
762 /* found no dev to bind */
763 err = -ENODEV;
764 done_unlock:
765 /* Release the socket list lock */
766 write_unlock_bh(&iucv_sk_list.lock);
767 done:
768 release_sock(sk);
769 return err;
770 }
771
772 /* Automatically bind an unbound socket */
773 static int iucv_sock_autobind(struct sock *sk)
774 {
775 struct iucv_sock *iucv = iucv_sk(sk);
776 char name[12];
777 int err = 0;
778
779 if (unlikely(!pr_iucv))
780 return -EPROTO;
781
782 memcpy(iucv->src_user_id, iucv_userid, 8);
783
784 write_lock_bh(&iucv_sk_list.lock);
785
786 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
787 while (__iucv_get_sock_by_name(name)) {
788 sprintf(name, "%08x",
789 atomic_inc_return(&iucv_sk_list.autobind_name));
790 }
791
792 write_unlock_bh(&iucv_sk_list.lock);
793
794 memcpy(&iucv->src_name, name, 8);
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 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
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 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
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 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
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 if (sock_queue_rcv_skb(sk, skb))
1300 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1301 }
1302
1303 /* iucv_process_message_q() - Process outstanding IUCV messages
1304 *
1305 * Locking: must be called with message_q.lock held
1306 */
1307 static void iucv_process_message_q(struct sock *sk)
1308 {
1309 struct iucv_sock *iucv = iucv_sk(sk);
1310 struct sk_buff *skb;
1311 struct sock_msg_q *p, *n;
1312
1313 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1314 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1315 if (!skb)
1316 break;
1317 iucv_process_message(sk, skb, p->path, &p->msg);
1318 list_del(&p->list);
1319 kfree(p);
1320 if (!skb_queue_empty(&iucv->backlog_skb_q))
1321 break;
1322 }
1323 }
1324
1325 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1326 struct msghdr *msg, size_t len, int flags)
1327 {
1328 int noblock = flags & MSG_DONTWAIT;
1329 struct sock *sk = sock->sk;
1330 struct iucv_sock *iucv = iucv_sk(sk);
1331 unsigned int copied, rlen;
1332 struct sk_buff *skb, *rskb, *cskb;
1333 int err = 0;
1334
1335 if ((sk->sk_state == IUCV_DISCONN) &&
1336 skb_queue_empty(&iucv->backlog_skb_q) &&
1337 skb_queue_empty(&sk->sk_receive_queue) &&
1338 list_empty(&iucv->message_q.list))
1339 return 0;
1340
1341 if (flags & (MSG_OOB))
1342 return -EOPNOTSUPP;
1343
1344 /* receive/dequeue next skb:
1345 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1346 skb = skb_recv_datagram(sk, flags, noblock, &err);
1347 if (!skb) {
1348 if (sk->sk_shutdown & RCV_SHUTDOWN)
1349 return 0;
1350 return err;
1351 }
1352
1353 rlen = skb->len; /* real length of skb */
1354 copied = min_t(unsigned int, rlen, len);
1355 if (!rlen)
1356 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1357
1358 cskb = skb;
1359 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
1360 if (!(flags & MSG_PEEK))
1361 skb_queue_head(&sk->sk_receive_queue, skb);
1362 return -EFAULT;
1363 }
1364
1365 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1366 if (sk->sk_type == SOCK_SEQPACKET) {
1367 if (copied < rlen)
1368 msg->msg_flags |= MSG_TRUNC;
1369 /* each iucv message contains a complete record */
1370 msg->msg_flags |= MSG_EOR;
1371 }
1372
1373 /* create control message to store iucv msg target class:
1374 * get the trgcls from the control buffer of the skb due to
1375 * fragmentation of original iucv message. */
1376 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1377 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1378 if (err) {
1379 if (!(flags & MSG_PEEK))
1380 skb_queue_head(&sk->sk_receive_queue, skb);
1381 return err;
1382 }
1383
1384 /* Mark read part of skb as used */
1385 if (!(flags & MSG_PEEK)) {
1386
1387 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1388 if (sk->sk_type == SOCK_STREAM) {
1389 skb_pull(skb, copied);
1390 if (skb->len) {
1391 skb_queue_head(&sk->sk_receive_queue, skb);
1392 goto done;
1393 }
1394 }
1395
1396 kfree_skb(skb);
1397 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1398 atomic_inc(&iucv->msg_recv);
1399 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1400 WARN_ON(1);
1401 iucv_sock_close(sk);
1402 return -EFAULT;
1403 }
1404 }
1405
1406 /* Queue backlog skbs */
1407 spin_lock_bh(&iucv->message_q.lock);
1408 rskb = skb_dequeue(&iucv->backlog_skb_q);
1409 while (rskb) {
1410 if (sock_queue_rcv_skb(sk, rskb)) {
1411 skb_queue_head(&iucv->backlog_skb_q,
1412 rskb);
1413 break;
1414 } else {
1415 rskb = skb_dequeue(&iucv->backlog_skb_q);
1416 }
1417 }
1418 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1419 if (!list_empty(&iucv->message_q.list))
1420 iucv_process_message_q(sk);
1421 if (atomic_read(&iucv->msg_recv) >=
1422 iucv->msglimit / 2) {
1423 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1424 if (err) {
1425 sk->sk_state = IUCV_DISCONN;
1426 sk->sk_state_change(sk);
1427 }
1428 }
1429 }
1430 spin_unlock_bh(&iucv->message_q.lock);
1431 }
1432
1433 done:
1434 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1435 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1436 copied = rlen;
1437
1438 return copied;
1439 }
1440
1441 static inline unsigned int iucv_accept_poll(struct sock *parent)
1442 {
1443 struct iucv_sock *isk, *n;
1444 struct sock *sk;
1445
1446 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1447 sk = (struct sock *) isk;
1448
1449 if (sk->sk_state == IUCV_CONNECTED)
1450 return POLLIN | POLLRDNORM;
1451 }
1452
1453 return 0;
1454 }
1455
1456 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1457 poll_table *wait)
1458 {
1459 struct sock *sk = sock->sk;
1460 unsigned int mask = 0;
1461
1462 sock_poll_wait(file, sk_sleep(sk), wait);
1463
1464 if (sk->sk_state == IUCV_LISTEN)
1465 return iucv_accept_poll(sk);
1466
1467 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1468 mask |= POLLERR;
1469
1470 if (sk->sk_shutdown & RCV_SHUTDOWN)
1471 mask |= POLLRDHUP;
1472
1473 if (sk->sk_shutdown == SHUTDOWN_MASK)
1474 mask |= POLLHUP;
1475
1476 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1477 (sk->sk_shutdown & RCV_SHUTDOWN))
1478 mask |= POLLIN | POLLRDNORM;
1479
1480 if (sk->sk_state == IUCV_CLOSED)
1481 mask |= POLLHUP;
1482
1483 if (sk->sk_state == IUCV_DISCONN)
1484 mask |= POLLIN;
1485
1486 if (sock_writeable(sk) && iucv_below_msglim(sk))
1487 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1488 else
1489 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1490
1491 return mask;
1492 }
1493
1494 static int iucv_sock_shutdown(struct socket *sock, int how)
1495 {
1496 struct sock *sk = sock->sk;
1497 struct iucv_sock *iucv = iucv_sk(sk);
1498 struct iucv_message txmsg;
1499 int err = 0;
1500
1501 how++;
1502
1503 if ((how & ~SHUTDOWN_MASK) || !how)
1504 return -EINVAL;
1505
1506 lock_sock(sk);
1507 switch (sk->sk_state) {
1508 case IUCV_LISTEN:
1509 case IUCV_DISCONN:
1510 case IUCV_CLOSING:
1511 case IUCV_CLOSED:
1512 err = -ENOTCONN;
1513 goto fail;
1514 default:
1515 break;
1516 }
1517
1518 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1519 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1520 txmsg.class = 0;
1521 txmsg.tag = 0;
1522 err = pr_iucv->message_send(iucv->path, &txmsg,
1523 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1524 if (err) {
1525 switch (err) {
1526 case 1:
1527 err = -ENOTCONN;
1528 break;
1529 case 2:
1530 err = -ECONNRESET;
1531 break;
1532 default:
1533 err = -ENOTCONN;
1534 break;
1535 }
1536 }
1537 } else
1538 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1539 }
1540
1541 sk->sk_shutdown |= how;
1542 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1543 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1544 err = pr_iucv->path_quiesce(iucv->path, NULL);
1545 if (err)
1546 err = -ENOTCONN;
1547 /* skb_queue_purge(&sk->sk_receive_queue); */
1548 }
1549 skb_queue_purge(&sk->sk_receive_queue);
1550 }
1551
1552 /* Wake up anyone sleeping in poll */
1553 sk->sk_state_change(sk);
1554
1555 fail:
1556 release_sock(sk);
1557 return err;
1558 }
1559
1560 static int iucv_sock_release(struct socket *sock)
1561 {
1562 struct sock *sk = sock->sk;
1563 int err = 0;
1564
1565 if (!sk)
1566 return 0;
1567
1568 iucv_sock_close(sk);
1569
1570 sock_orphan(sk);
1571 iucv_sock_kill(sk);
1572 return err;
1573 }
1574
1575 /* getsockopt and setsockopt */
1576 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1577 char __user *optval, unsigned int optlen)
1578 {
1579 struct sock *sk = sock->sk;
1580 struct iucv_sock *iucv = iucv_sk(sk);
1581 int val;
1582 int rc;
1583
1584 if (level != SOL_IUCV)
1585 return -ENOPROTOOPT;
1586
1587 if (optlen < sizeof(int))
1588 return -EINVAL;
1589
1590 if (get_user(val, (int __user *) optval))
1591 return -EFAULT;
1592
1593 rc = 0;
1594
1595 lock_sock(sk);
1596 switch (optname) {
1597 case SO_IPRMDATA_MSG:
1598 if (val)
1599 iucv->flags |= IUCV_IPRMDATA;
1600 else
1601 iucv->flags &= ~IUCV_IPRMDATA;
1602 break;
1603 case SO_MSGLIMIT:
1604 switch (sk->sk_state) {
1605 case IUCV_OPEN:
1606 case IUCV_BOUND:
1607 if (val < 1 || val > (u16)(~0))
1608 rc = -EINVAL;
1609 else
1610 iucv->msglimit = val;
1611 break;
1612 default:
1613 rc = -EINVAL;
1614 break;
1615 }
1616 break;
1617 default:
1618 rc = -ENOPROTOOPT;
1619 break;
1620 }
1621 release_sock(sk);
1622
1623 return rc;
1624 }
1625
1626 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1627 char __user *optval, int __user *optlen)
1628 {
1629 struct sock *sk = sock->sk;
1630 struct iucv_sock *iucv = iucv_sk(sk);
1631 unsigned int val;
1632 int len;
1633
1634 if (level != SOL_IUCV)
1635 return -ENOPROTOOPT;
1636
1637 if (get_user(len, optlen))
1638 return -EFAULT;
1639
1640 if (len < 0)
1641 return -EINVAL;
1642
1643 len = min_t(unsigned int, len, sizeof(int));
1644
1645 switch (optname) {
1646 case SO_IPRMDATA_MSG:
1647 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1648 break;
1649 case SO_MSGLIMIT:
1650 lock_sock(sk);
1651 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1652 : iucv->msglimit; /* default */
1653 release_sock(sk);
1654 break;
1655 case SO_MSGSIZE:
1656 if (sk->sk_state == IUCV_OPEN)
1657 return -EBADFD;
1658 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1659 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1660 0x7fffffff;
1661 break;
1662 default:
1663 return -ENOPROTOOPT;
1664 }
1665
1666 if (put_user(len, optlen))
1667 return -EFAULT;
1668 if (copy_to_user(optval, &val, len))
1669 return -EFAULT;
1670
1671 return 0;
1672 }
1673
1674
1675 /* Callback wrappers - called from iucv base support */
1676 static int iucv_callback_connreq(struct iucv_path *path,
1677 u8 ipvmid[8], u8 ipuser[16])
1678 {
1679 unsigned char user_data[16];
1680 unsigned char nuser_data[16];
1681 unsigned char src_name[8];
1682 struct hlist_node *node;
1683 struct sock *sk, *nsk;
1684 struct iucv_sock *iucv, *niucv;
1685 int err;
1686
1687 memcpy(src_name, ipuser, 8);
1688 EBCASC(src_name, 8);
1689 /* Find out if this path belongs to af_iucv. */
1690 read_lock(&iucv_sk_list.lock);
1691 iucv = NULL;
1692 sk = NULL;
1693 sk_for_each(sk, node, &iucv_sk_list.head)
1694 if (sk->sk_state == IUCV_LISTEN &&
1695 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1696 /*
1697 * Found a listening socket with
1698 * src_name == ipuser[0-7].
1699 */
1700 iucv = iucv_sk(sk);
1701 break;
1702 }
1703 read_unlock(&iucv_sk_list.lock);
1704 if (!iucv)
1705 /* No socket found, not one of our paths. */
1706 return -EINVAL;
1707
1708 bh_lock_sock(sk);
1709
1710 /* Check if parent socket is listening */
1711 low_nmcpy(user_data, iucv->src_name);
1712 high_nmcpy(user_data, iucv->dst_name);
1713 ASCEBC(user_data, sizeof(user_data));
1714 if (sk->sk_state != IUCV_LISTEN) {
1715 err = pr_iucv->path_sever(path, user_data);
1716 iucv_path_free(path);
1717 goto fail;
1718 }
1719
1720 /* Check for backlog size */
1721 if (sk_acceptq_is_full(sk)) {
1722 err = pr_iucv->path_sever(path, user_data);
1723 iucv_path_free(path);
1724 goto fail;
1725 }
1726
1727 /* Create the new socket */
1728 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1729 if (!nsk) {
1730 err = pr_iucv->path_sever(path, user_data);
1731 iucv_path_free(path);
1732 goto fail;
1733 }
1734
1735 niucv = iucv_sk(nsk);
1736 iucv_sock_init(nsk, sk);
1737
1738 /* Set the new iucv_sock */
1739 memcpy(niucv->dst_name, ipuser + 8, 8);
1740 EBCASC(niucv->dst_name, 8);
1741 memcpy(niucv->dst_user_id, ipvmid, 8);
1742 memcpy(niucv->src_name, iucv->src_name, 8);
1743 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1744 niucv->path = path;
1745
1746 /* Call iucv_accept */
1747 high_nmcpy(nuser_data, ipuser + 8);
1748 memcpy(nuser_data + 8, niucv->src_name, 8);
1749 ASCEBC(nuser_data + 8, 8);
1750
1751 /* set message limit for path based on msglimit of accepting socket */
1752 niucv->msglimit = iucv->msglimit;
1753 path->msglim = iucv->msglimit;
1754 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1755 if (err) {
1756 iucv_sever_path(nsk, 1);
1757 iucv_sock_kill(nsk);
1758 goto fail;
1759 }
1760
1761 iucv_accept_enqueue(sk, nsk);
1762
1763 /* Wake up accept */
1764 nsk->sk_state = IUCV_CONNECTED;
1765 sk->sk_data_ready(sk, 1);
1766 err = 0;
1767 fail:
1768 bh_unlock_sock(sk);
1769 return 0;
1770 }
1771
1772 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1773 {
1774 struct sock *sk = path->private;
1775
1776 sk->sk_state = IUCV_CONNECTED;
1777 sk->sk_state_change(sk);
1778 }
1779
1780 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1781 {
1782 struct sock *sk = path->private;
1783 struct iucv_sock *iucv = iucv_sk(sk);
1784 struct sk_buff *skb;
1785 struct sock_msg_q *save_msg;
1786 int len;
1787
1788 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1789 pr_iucv->message_reject(path, msg);
1790 return;
1791 }
1792
1793 spin_lock(&iucv->message_q.lock);
1794
1795 if (!list_empty(&iucv->message_q.list) ||
1796 !skb_queue_empty(&iucv->backlog_skb_q))
1797 goto save_message;
1798
1799 len = atomic_read(&sk->sk_rmem_alloc);
1800 len += SKB_TRUESIZE(iucv_msg_length(msg));
1801 if (len > sk->sk_rcvbuf)
1802 goto save_message;
1803
1804 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1805 if (!skb)
1806 goto save_message;
1807
1808 iucv_process_message(sk, skb, path, msg);
1809 goto out_unlock;
1810
1811 save_message:
1812 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1813 if (!save_msg)
1814 goto out_unlock;
1815 save_msg->path = path;
1816 save_msg->msg = *msg;
1817
1818 list_add_tail(&save_msg->list, &iucv->message_q.list);
1819
1820 out_unlock:
1821 spin_unlock(&iucv->message_q.lock);
1822 }
1823
1824 static void iucv_callback_txdone(struct iucv_path *path,
1825 struct iucv_message *msg)
1826 {
1827 struct sock *sk = path->private;
1828 struct sk_buff *this = NULL;
1829 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1830 struct sk_buff *list_skb = list->next;
1831 unsigned long flags;
1832
1833 bh_lock_sock(sk);
1834 if (!skb_queue_empty(list)) {
1835 spin_lock_irqsave(&list->lock, flags);
1836
1837 while (list_skb != (struct sk_buff *)list) {
1838 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1839 this = list_skb;
1840 break;
1841 }
1842 list_skb = list_skb->next;
1843 }
1844 if (this)
1845 __skb_unlink(this, list);
1846
1847 spin_unlock_irqrestore(&list->lock, flags);
1848
1849 if (this) {
1850 kfree_skb(this);
1851 /* wake up any process waiting for sending */
1852 iucv_sock_wake_msglim(sk);
1853 }
1854 }
1855
1856 if (sk->sk_state == IUCV_CLOSING) {
1857 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1858 sk->sk_state = IUCV_CLOSED;
1859 sk->sk_state_change(sk);
1860 }
1861 }
1862 bh_unlock_sock(sk);
1863
1864 }
1865
1866 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1867 {
1868 struct sock *sk = path->private;
1869
1870 if (sk->sk_state == IUCV_CLOSED)
1871 return;
1872
1873 bh_lock_sock(sk);
1874 iucv_sever_path(sk, 1);
1875 sk->sk_state = IUCV_DISCONN;
1876
1877 sk->sk_state_change(sk);
1878 bh_unlock_sock(sk);
1879 }
1880
1881 /* called if the other communication side shuts down its RECV direction;
1882 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1883 */
1884 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1885 {
1886 struct sock *sk = path->private;
1887
1888 bh_lock_sock(sk);
1889 if (sk->sk_state != IUCV_CLOSED) {
1890 sk->sk_shutdown |= SEND_SHUTDOWN;
1891 sk->sk_state_change(sk);
1892 }
1893 bh_unlock_sock(sk);
1894 }
1895
1896 /***************** HiperSockets transport callbacks ********************/
1897 static void afiucv_swap_src_dest(struct sk_buff *skb)
1898 {
1899 struct af_iucv_trans_hdr *trans_hdr =
1900 (struct af_iucv_trans_hdr *)skb->data;
1901 char tmpID[8];
1902 char tmpName[8];
1903
1904 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1905 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1906 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1907 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1908 memcpy(tmpID, trans_hdr->srcUserID, 8);
1909 memcpy(tmpName, trans_hdr->srcAppName, 8);
1910 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1911 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1912 memcpy(trans_hdr->destUserID, tmpID, 8);
1913 memcpy(trans_hdr->destAppName, tmpName, 8);
1914 skb_push(skb, ETH_HLEN);
1915 memset(skb->data, 0, ETH_HLEN);
1916 }
1917
1918 /**
1919 * afiucv_hs_callback_syn - react on received SYN
1920 **/
1921 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1922 {
1923 struct sock *nsk;
1924 struct iucv_sock *iucv, *niucv;
1925 struct af_iucv_trans_hdr *trans_hdr;
1926 int err;
1927
1928 iucv = iucv_sk(sk);
1929 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1930 if (!iucv) {
1931 /* no sock - connection refused */
1932 afiucv_swap_src_dest(skb);
1933 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1934 err = dev_queue_xmit(skb);
1935 goto out;
1936 }
1937
1938 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1939 bh_lock_sock(sk);
1940 if ((sk->sk_state != IUCV_LISTEN) ||
1941 sk_acceptq_is_full(sk) ||
1942 !nsk) {
1943 /* error on server socket - connection refused */
1944 if (nsk)
1945 sk_free(nsk);
1946 afiucv_swap_src_dest(skb);
1947 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1948 err = dev_queue_xmit(skb);
1949 bh_unlock_sock(sk);
1950 goto out;
1951 }
1952
1953 niucv = iucv_sk(nsk);
1954 iucv_sock_init(nsk, sk);
1955 niucv->transport = AF_IUCV_TRANS_HIPER;
1956 niucv->msglimit = iucv->msglimit;
1957 if (!trans_hdr->window)
1958 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1959 else
1960 niucv->msglimit_peer = trans_hdr->window;
1961 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1962 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1963 memcpy(niucv->src_name, iucv->src_name, 8);
1964 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1965 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1966 niucv->hs_dev = iucv->hs_dev;
1967 dev_hold(niucv->hs_dev);
1968 afiucv_swap_src_dest(skb);
1969 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1970 trans_hdr->window = niucv->msglimit;
1971 /* if receiver acks the xmit connection is established */
1972 err = dev_queue_xmit(skb);
1973 if (!err) {
1974 iucv_accept_enqueue(sk, nsk);
1975 nsk->sk_state = IUCV_CONNECTED;
1976 sk->sk_data_ready(sk, 1);
1977 } else
1978 iucv_sock_kill(nsk);
1979 bh_unlock_sock(sk);
1980
1981 out:
1982 return NET_RX_SUCCESS;
1983 }
1984
1985 /**
1986 * afiucv_hs_callback_synack() - react on received SYN-ACK
1987 **/
1988 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1989 {
1990 struct iucv_sock *iucv = iucv_sk(sk);
1991 struct af_iucv_trans_hdr *trans_hdr =
1992 (struct af_iucv_trans_hdr *)skb->data;
1993
1994 if (!iucv)
1995 goto out;
1996 if (sk->sk_state != IUCV_BOUND)
1997 goto out;
1998 bh_lock_sock(sk);
1999 iucv->msglimit_peer = trans_hdr->window;
2000 sk->sk_state = IUCV_CONNECTED;
2001 sk->sk_state_change(sk);
2002 bh_unlock_sock(sk);
2003 out:
2004 kfree_skb(skb);
2005 return NET_RX_SUCCESS;
2006 }
2007
2008 /**
2009 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2010 **/
2011 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2012 {
2013 struct iucv_sock *iucv = iucv_sk(sk);
2014
2015 if (!iucv)
2016 goto out;
2017 if (sk->sk_state != IUCV_BOUND)
2018 goto out;
2019 bh_lock_sock(sk);
2020 sk->sk_state = IUCV_DISCONN;
2021 sk->sk_state_change(sk);
2022 bh_unlock_sock(sk);
2023 out:
2024 kfree_skb(skb);
2025 return NET_RX_SUCCESS;
2026 }
2027
2028 /**
2029 * afiucv_hs_callback_fin() - react on received FIN
2030 **/
2031 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2032 {
2033 struct iucv_sock *iucv = iucv_sk(sk);
2034
2035 /* other end of connection closed */
2036 if (!iucv)
2037 goto out;
2038 bh_lock_sock(sk);
2039 if (sk->sk_state == IUCV_CONNECTED) {
2040 sk->sk_state = IUCV_DISCONN;
2041 sk->sk_state_change(sk);
2042 }
2043 bh_unlock_sock(sk);
2044 out:
2045 kfree_skb(skb);
2046 return NET_RX_SUCCESS;
2047 }
2048
2049 /**
2050 * afiucv_hs_callback_win() - react on received WIN
2051 **/
2052 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2053 {
2054 struct iucv_sock *iucv = iucv_sk(sk);
2055 struct af_iucv_trans_hdr *trans_hdr =
2056 (struct af_iucv_trans_hdr *)skb->data;
2057
2058 if (!iucv)
2059 return NET_RX_SUCCESS;
2060
2061 if (sk->sk_state != IUCV_CONNECTED)
2062 return NET_RX_SUCCESS;
2063
2064 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2065 iucv_sock_wake_msglim(sk);
2066 return NET_RX_SUCCESS;
2067 }
2068
2069 /**
2070 * afiucv_hs_callback_rx() - react on received data
2071 **/
2072 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2073 {
2074 struct iucv_sock *iucv = iucv_sk(sk);
2075
2076 if (!iucv) {
2077 kfree_skb(skb);
2078 return NET_RX_SUCCESS;
2079 }
2080
2081 if (sk->sk_state != IUCV_CONNECTED) {
2082 kfree_skb(skb);
2083 return NET_RX_SUCCESS;
2084 }
2085
2086 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2087 kfree_skb(skb);
2088 return NET_RX_SUCCESS;
2089 }
2090
2091 /* write stuff from iucv_msg to skb cb */
2092 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2093 kfree_skb(skb);
2094 return NET_RX_SUCCESS;
2095 }
2096 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2097 skb_reset_transport_header(skb);
2098 skb_reset_network_header(skb);
2099 spin_lock(&iucv->message_q.lock);
2100 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2101 if (sock_queue_rcv_skb(sk, skb)) {
2102 /* handle rcv queue full */
2103 skb_queue_tail(&iucv->backlog_skb_q, skb);
2104 }
2105 } else
2106 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2107 spin_unlock(&iucv->message_q.lock);
2108 return NET_RX_SUCCESS;
2109 }
2110
2111 /**
2112 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2113 * transport
2114 * called from netif RX softirq
2115 **/
2116 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2117 struct packet_type *pt, struct net_device *orig_dev)
2118 {
2119 struct hlist_node *node;
2120 struct sock *sk;
2121 struct iucv_sock *iucv;
2122 struct af_iucv_trans_hdr *trans_hdr;
2123 char nullstring[8];
2124 int err = 0;
2125
2126 skb_pull(skb, ETH_HLEN);
2127 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2128 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2129 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2130 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2131 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2132 memset(nullstring, 0, sizeof(nullstring));
2133 iucv = NULL;
2134 sk = NULL;
2135 read_lock(&iucv_sk_list.lock);
2136 sk_for_each(sk, node, &iucv_sk_list.head) {
2137 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2138 if ((!memcmp(&iucv_sk(sk)->src_name,
2139 trans_hdr->destAppName, 8)) &&
2140 (!memcmp(&iucv_sk(sk)->src_user_id,
2141 trans_hdr->destUserID, 8)) &&
2142 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2143 (!memcmp(&iucv_sk(sk)->dst_user_id,
2144 nullstring, 8))) {
2145 iucv = iucv_sk(sk);
2146 break;
2147 }
2148 } else {
2149 if ((!memcmp(&iucv_sk(sk)->src_name,
2150 trans_hdr->destAppName, 8)) &&
2151 (!memcmp(&iucv_sk(sk)->src_user_id,
2152 trans_hdr->destUserID, 8)) &&
2153 (!memcmp(&iucv_sk(sk)->dst_name,
2154 trans_hdr->srcAppName, 8)) &&
2155 (!memcmp(&iucv_sk(sk)->dst_user_id,
2156 trans_hdr->srcUserID, 8))) {
2157 iucv = iucv_sk(sk);
2158 break;
2159 }
2160 }
2161 }
2162 read_unlock(&iucv_sk_list.lock);
2163 if (!iucv)
2164 sk = NULL;
2165
2166 /* no sock
2167 how should we send with no sock
2168 1) send without sock no send rc checking?
2169 2) introduce default sock to handle this cases
2170
2171 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2172 data -> send FIN
2173 SYN|ACK, SYN|FIN, FIN -> no action? */
2174
2175 switch (trans_hdr->flags) {
2176 case AF_IUCV_FLAG_SYN:
2177 /* connect request */
2178 err = afiucv_hs_callback_syn(sk, skb);
2179 break;
2180 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2181 /* connect request confirmed */
2182 err = afiucv_hs_callback_synack(sk, skb);
2183 break;
2184 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2185 /* connect request refused */
2186 err = afiucv_hs_callback_synfin(sk, skb);
2187 break;
2188 case (AF_IUCV_FLAG_FIN):
2189 /* close request */
2190 err = afiucv_hs_callback_fin(sk, skb);
2191 break;
2192 case (AF_IUCV_FLAG_WIN):
2193 err = afiucv_hs_callback_win(sk, skb);
2194 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2195 kfree_skb(skb);
2196 break;
2197 }
2198 /* fall through and receive non-zero length data */
2199 case (AF_IUCV_FLAG_SHT):
2200 /* shutdown request */
2201 /* fall through and receive zero length data */
2202 case 0:
2203 /* plain data frame */
2204 memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class,
2205 CB_TRGCLS_LEN);
2206 err = afiucv_hs_callback_rx(sk, skb);
2207 break;
2208 default:
2209 ;
2210 }
2211
2212 return err;
2213 }
2214
2215 /**
2216 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2217 * transport
2218 **/
2219 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2220 enum iucv_tx_notify n)
2221 {
2222 struct sock *isk = skb->sk;
2223 struct sock *sk = NULL;
2224 struct iucv_sock *iucv = NULL;
2225 struct sk_buff_head *list;
2226 struct sk_buff *list_skb;
2227 struct sk_buff *nskb;
2228 unsigned long flags;
2229 struct hlist_node *node;
2230
2231 read_lock_irqsave(&iucv_sk_list.lock, flags);
2232 sk_for_each(sk, node, &iucv_sk_list.head)
2233 if (sk == isk) {
2234 iucv = iucv_sk(sk);
2235 break;
2236 }
2237 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2238
2239 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2240 return;
2241
2242 list = &iucv->send_skb_q;
2243 spin_lock_irqsave(&list->lock, flags);
2244 if (skb_queue_empty(list))
2245 goto out_unlock;
2246 list_skb = list->next;
2247 nskb = list_skb->next;
2248 while (list_skb != (struct sk_buff *)list) {
2249 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2250 switch (n) {
2251 case TX_NOTIFY_OK:
2252 __skb_unlink(list_skb, list);
2253 kfree_skb(list_skb);
2254 iucv_sock_wake_msglim(sk);
2255 break;
2256 case TX_NOTIFY_PENDING:
2257 atomic_inc(&iucv->pendings);
2258 break;
2259 case TX_NOTIFY_DELAYED_OK:
2260 __skb_unlink(list_skb, list);
2261 atomic_dec(&iucv->pendings);
2262 if (atomic_read(&iucv->pendings) <= 0)
2263 iucv_sock_wake_msglim(sk);
2264 kfree_skb(list_skb);
2265 break;
2266 case TX_NOTIFY_UNREACHABLE:
2267 case TX_NOTIFY_DELAYED_UNREACHABLE:
2268 case TX_NOTIFY_TPQFULL: /* not yet used */
2269 case TX_NOTIFY_GENERALERROR:
2270 case TX_NOTIFY_DELAYED_GENERALERROR:
2271 __skb_unlink(list_skb, list);
2272 kfree_skb(list_skb);
2273 if (sk->sk_state == IUCV_CONNECTED) {
2274 sk->sk_state = IUCV_DISCONN;
2275 sk->sk_state_change(sk);
2276 }
2277 break;
2278 }
2279 break;
2280 }
2281 list_skb = nskb;
2282 nskb = nskb->next;
2283 }
2284 out_unlock:
2285 spin_unlock_irqrestore(&list->lock, flags);
2286
2287 if (sk->sk_state == IUCV_CLOSING) {
2288 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2289 sk->sk_state = IUCV_CLOSED;
2290 sk->sk_state_change(sk);
2291 }
2292 }
2293
2294 }
2295
2296 /*
2297 * afiucv_netdev_event: handle netdev notifier chain events
2298 */
2299 static int afiucv_netdev_event(struct notifier_block *this,
2300 unsigned long event, void *ptr)
2301 {
2302 struct net_device *event_dev = (struct net_device *)ptr;
2303 struct hlist_node *node;
2304 struct sock *sk;
2305 struct iucv_sock *iucv;
2306
2307 switch (event) {
2308 case NETDEV_REBOOT:
2309 case NETDEV_GOING_DOWN:
2310 sk_for_each(sk, node, &iucv_sk_list.head) {
2311 iucv = iucv_sk(sk);
2312 if ((iucv->hs_dev == event_dev) &&
2313 (sk->sk_state == IUCV_CONNECTED)) {
2314 if (event == NETDEV_GOING_DOWN)
2315 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2316 sk->sk_state = IUCV_DISCONN;
2317 sk->sk_state_change(sk);
2318 }
2319 }
2320 break;
2321 case NETDEV_DOWN:
2322 case NETDEV_UNREGISTER:
2323 default:
2324 break;
2325 }
2326 return NOTIFY_DONE;
2327 }
2328
2329 static struct notifier_block afiucv_netdev_notifier = {
2330 .notifier_call = afiucv_netdev_event,
2331 };
2332
2333 static const struct proto_ops iucv_sock_ops = {
2334 .family = PF_IUCV,
2335 .owner = THIS_MODULE,
2336 .release = iucv_sock_release,
2337 .bind = iucv_sock_bind,
2338 .connect = iucv_sock_connect,
2339 .listen = iucv_sock_listen,
2340 .accept = iucv_sock_accept,
2341 .getname = iucv_sock_getname,
2342 .sendmsg = iucv_sock_sendmsg,
2343 .recvmsg = iucv_sock_recvmsg,
2344 .poll = iucv_sock_poll,
2345 .ioctl = sock_no_ioctl,
2346 .mmap = sock_no_mmap,
2347 .socketpair = sock_no_socketpair,
2348 .shutdown = iucv_sock_shutdown,
2349 .setsockopt = iucv_sock_setsockopt,
2350 .getsockopt = iucv_sock_getsockopt,
2351 };
2352
2353 static const struct net_proto_family iucv_sock_family_ops = {
2354 .family = AF_IUCV,
2355 .owner = THIS_MODULE,
2356 .create = iucv_sock_create,
2357 };
2358
2359 static struct packet_type iucv_packet_type = {
2360 .type = cpu_to_be16(ETH_P_AF_IUCV),
2361 .func = afiucv_hs_rcv,
2362 };
2363
2364 static int afiucv_iucv_init(void)
2365 {
2366 int err;
2367
2368 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2369 if (err)
2370 goto out;
2371 /* establish dummy device */
2372 af_iucv_driver.bus = pr_iucv->bus;
2373 err = driver_register(&af_iucv_driver);
2374 if (err)
2375 goto out_iucv;
2376 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2377 if (!af_iucv_dev) {
2378 err = -ENOMEM;
2379 goto out_driver;
2380 }
2381 dev_set_name(af_iucv_dev, "af_iucv");
2382 af_iucv_dev->bus = pr_iucv->bus;
2383 af_iucv_dev->parent = pr_iucv->root;
2384 af_iucv_dev->release = (void (*)(struct device *))kfree;
2385 af_iucv_dev->driver = &af_iucv_driver;
2386 err = device_register(af_iucv_dev);
2387 if (err)
2388 goto out_driver;
2389 return 0;
2390
2391 out_driver:
2392 driver_unregister(&af_iucv_driver);
2393 out_iucv:
2394 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2395 out:
2396 return err;
2397 }
2398
2399 static int __init afiucv_init(void)
2400 {
2401 int err;
2402
2403 if (MACHINE_IS_VM) {
2404 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2405 if (unlikely(err)) {
2406 WARN_ON(err);
2407 err = -EPROTONOSUPPORT;
2408 goto out;
2409 }
2410
2411 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2412 if (!pr_iucv) {
2413 printk(KERN_WARNING "iucv_if lookup failed\n");
2414 memset(&iucv_userid, 0, sizeof(iucv_userid));
2415 }
2416 } else {
2417 memset(&iucv_userid, 0, sizeof(iucv_userid));
2418 pr_iucv = NULL;
2419 }
2420
2421 err = proto_register(&iucv_proto, 0);
2422 if (err)
2423 goto out;
2424 err = sock_register(&iucv_sock_family_ops);
2425 if (err)
2426 goto out_proto;
2427
2428 if (pr_iucv) {
2429 err = afiucv_iucv_init();
2430 if (err)
2431 goto out_sock;
2432 } else
2433 register_netdevice_notifier(&afiucv_netdev_notifier);
2434 dev_add_pack(&iucv_packet_type);
2435 return 0;
2436
2437 out_sock:
2438 sock_unregister(PF_IUCV);
2439 out_proto:
2440 proto_unregister(&iucv_proto);
2441 out:
2442 if (pr_iucv)
2443 symbol_put(iucv_if);
2444 return err;
2445 }
2446
2447 static void __exit afiucv_exit(void)
2448 {
2449 if (pr_iucv) {
2450 device_unregister(af_iucv_dev);
2451 driver_unregister(&af_iucv_driver);
2452 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2453 symbol_put(iucv_if);
2454 } else
2455 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2456 dev_remove_pack(&iucv_packet_type);
2457 sock_unregister(PF_IUCV);
2458 proto_unregister(&iucv_proto);
2459 }
2460
2461 module_init(afiucv_init);
2462 module_exit(afiucv_exit);
2463
2464 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2465 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2466 MODULE_VERSION(VERSION);
2467 MODULE_LICENSE("GPL");
2468 MODULE_ALIAS_NETPROTO(PF_IUCV);
2469
CJK support for tty framebuffer vt