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