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[people/ms/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/signal.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <asm/ebcdic.h>
28 #include <asm/cpcmd.h>
29 #include <linux/kmod.h>
30
31 #include <net/iucv/af_iucv.h>
32
33 #define VERSION "1.2"
34
35 static char iucv_userid[80];
36
37 static const struct proto_ops iucv_sock_ops;
38
39 static struct proto iucv_proto = {
40 .name = "AF_IUCV",
41 .owner = THIS_MODULE,
42 .obj_size = sizeof(struct iucv_sock),
43 };
44
45 static struct iucv_interface *pr_iucv;
46
47 /* special AF_IUCV IPRM messages */
48 static const u8 iprm_shutdown[8] =
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
50
51 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
52
53 #define __iucv_sock_wait(sk, condition, timeo, ret) \
54 do { \
55 DEFINE_WAIT(__wait); \
56 long __timeo = timeo; \
57 ret = 0; \
58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
59 while (!(condition)) { \
60 if (!__timeo) { \
61 ret = -EAGAIN; \
62 break; \
63 } \
64 if (signal_pending(current)) { \
65 ret = sock_intr_errno(__timeo); \
66 break; \
67 } \
68 release_sock(sk); \
69 __timeo = schedule_timeout(__timeo); \
70 lock_sock(sk); \
71 ret = sock_error(sk); \
72 if (ret) \
73 break; \
74 } \
75 finish_wait(sk_sleep(sk), &__wait); \
76 } while (0)
77
78 #define iucv_sock_wait(sk, condition, timeo) \
79 ({ \
80 int __ret = 0; \
81 if (!(condition)) \
82 __iucv_sock_wait(sk, condition, timeo, __ret); \
83 __ret; \
84 })
85
86 static void iucv_sock_kill(struct sock *sk);
87 static void iucv_sock_close(struct sock *sk);
88 static void iucv_sever_path(struct sock *, int);
89
90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
91 struct packet_type *pt, struct net_device *orig_dev);
92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
93 struct sk_buff *skb, u8 flags);
94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
95
96 /* Call Back functions */
97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
99 static void iucv_callback_connack(struct iucv_path *, u8 *);
100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
103
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
107 };
108
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
116 };
117
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120 memcpy(dst, src, 8);
121 }
122
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(&dst[8], src, 8);
126 }
127
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133 return 0;
134 }
135
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142
143 /**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151 struct iucv_sock *iucv;
152 struct sock *sk;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 switch (sk->sk_state) {
162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
165 iucv_sever_path(sk, 0);
166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179 }
180
181 /**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189 struct sock *sk;
190
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213 }
214
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221 };
222
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
226 .bus = NULL,
227 .pm = &afiucv_pm_ops,
228 };
229
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232
233 /**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
245 * The socket data length is computed by subtracting the socket data length
246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262 }
263
264 /**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274 return (sk->sk_state == state || sk->sk_state == state2);
275 }
276
277 /**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
296 }
297
298 /**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
307 if (skwq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310 rcu_read_unlock();
311 }
312
313 /**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318 {
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = skb_push(skb, sizeof(struct af_iucv_trans_hdr));
326 skb_reset_mac_header(skb);
327 skb_reset_network_header(skb);
328 skb_push(skb, ETH_HLEN);
329 skb_reset_mac_header(skb);
330 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
331
332 phs_hdr->magic = ETH_P_AF_IUCV;
333 phs_hdr->version = 1;
334 phs_hdr->flags = flags;
335 if (flags == AF_IUCV_FLAG_SYN)
336 phs_hdr->window = iucv->msglimit;
337 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
338 confirm_recv = atomic_read(&iucv->msg_recv);
339 phs_hdr->window = confirm_recv;
340 if (confirm_recv)
341 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
342 }
343 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
344 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
345 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
346 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
347 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
348 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
349 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
350 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
351 if (imsg)
352 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
353
354 skb->dev = iucv->hs_dev;
355 if (!skb->dev)
356 return -ENODEV;
357 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
358 return -ENETDOWN;
359 if (skb->len > skb->dev->mtu) {
360 if (sock->sk_type == SOCK_SEQPACKET)
361 return -EMSGSIZE;
362 else
363 skb_trim(skb, skb->dev->mtu);
364 }
365 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
366 nskb = skb_clone(skb, GFP_ATOMIC);
367 if (!nskb)
368 return -ENOMEM;
369 skb_queue_tail(&iucv->send_skb_q, nskb);
370 err = dev_queue_xmit(skb);
371 if (net_xmit_eval(err)) {
372 skb_unlink(nskb, &iucv->send_skb_q);
373 kfree_skb(nskb);
374 } else {
375 atomic_sub(confirm_recv, &iucv->msg_recv);
376 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
377 }
378 return net_xmit_eval(err);
379 }
380
381 static struct sock *__iucv_get_sock_by_name(char *nm)
382 {
383 struct sock *sk;
384
385 sk_for_each(sk, &iucv_sk_list.head)
386 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
387 return sk;
388
389 return NULL;
390 }
391
392 static void iucv_sock_destruct(struct sock *sk)
393 {
394 skb_queue_purge(&sk->sk_receive_queue);
395 skb_queue_purge(&sk->sk_error_queue);
396
397 sk_mem_reclaim(sk);
398
399 if (!sock_flag(sk, SOCK_DEAD)) {
400 pr_err("Attempt to release alive iucv socket %p\n", sk);
401 return;
402 }
403
404 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
405 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
406 WARN_ON(sk->sk_wmem_queued);
407 WARN_ON(sk->sk_forward_alloc);
408 }
409
410 /* Cleanup Listen */
411 static void iucv_sock_cleanup_listen(struct sock *parent)
412 {
413 struct sock *sk;
414
415 /* Close non-accepted connections */
416 while ((sk = iucv_accept_dequeue(parent, NULL))) {
417 iucv_sock_close(sk);
418 iucv_sock_kill(sk);
419 }
420
421 parent->sk_state = IUCV_CLOSED;
422 }
423
424 /* Kill socket (only if zapped and orphaned) */
425 static void iucv_sock_kill(struct sock *sk)
426 {
427 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
428 return;
429
430 iucv_sock_unlink(&iucv_sk_list, sk);
431 sock_set_flag(sk, SOCK_DEAD);
432 sock_put(sk);
433 }
434
435 /* Terminate an IUCV path */
436 static void iucv_sever_path(struct sock *sk, int with_user_data)
437 {
438 unsigned char user_data[16];
439 struct iucv_sock *iucv = iucv_sk(sk);
440 struct iucv_path *path = iucv->path;
441
442 if (iucv->path) {
443 iucv->path = NULL;
444 if (with_user_data) {
445 low_nmcpy(user_data, iucv->src_name);
446 high_nmcpy(user_data, iucv->dst_name);
447 ASCEBC(user_data, sizeof(user_data));
448 pr_iucv->path_sever(path, user_data);
449 } else
450 pr_iucv->path_sever(path, NULL);
451 iucv_path_free(path);
452 }
453 }
454
455 /* Send controlling flags through an IUCV socket for HIPER transport */
456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
457 {
458 int err = 0;
459 int blen;
460 struct sk_buff *skb;
461 u8 shutdown = 0;
462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 if (sk->sk_shutdown & SEND_SHUTDOWN) {
465 /* controlling flags should be sent anyway */
466 shutdown = sk->sk_shutdown;
467 sk->sk_shutdown &= RCV_SHUTDOWN;
468 }
469 skb = sock_alloc_send_skb(sk, blen, 1, &err);
470 if (skb) {
471 skb_reserve(skb, blen);
472 err = afiucv_hs_send(NULL, sk, skb, flags);
473 }
474 if (shutdown)
475 sk->sk_shutdown = shutdown;
476 return err;
477 }
478
479 /* Close an IUCV socket */
480 static void iucv_sock_close(struct sock *sk)
481 {
482 struct iucv_sock *iucv = iucv_sk(sk);
483 unsigned long timeo;
484 int err = 0;
485
486 lock_sock(sk);
487
488 switch (sk->sk_state) {
489 case IUCV_LISTEN:
490 iucv_sock_cleanup_listen(sk);
491 break;
492
493 case IUCV_CONNECTED:
494 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
495 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
496 sk->sk_state = IUCV_DISCONN;
497 sk->sk_state_change(sk);
498 }
499 case IUCV_DISCONN: /* fall through */
500 sk->sk_state = IUCV_CLOSING;
501 sk->sk_state_change(sk);
502
503 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
504 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
505 timeo = sk->sk_lingertime;
506 else
507 timeo = IUCV_DISCONN_TIMEOUT;
508 iucv_sock_wait(sk,
509 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
510 timeo);
511 }
512
513 case IUCV_CLOSING: /* fall through */
514 sk->sk_state = IUCV_CLOSED;
515 sk->sk_state_change(sk);
516
517 sk->sk_err = ECONNRESET;
518 sk->sk_state_change(sk);
519
520 skb_queue_purge(&iucv->send_skb_q);
521 skb_queue_purge(&iucv->backlog_skb_q);
522
523 default: /* fall through */
524 iucv_sever_path(sk, 1);
525 }
526
527 if (iucv->hs_dev) {
528 dev_put(iucv->hs_dev);
529 iucv->hs_dev = NULL;
530 sk->sk_bound_dev_if = 0;
531 }
532
533 /* mark socket for deletion by iucv_sock_kill() */
534 sock_set_flag(sk, SOCK_ZAPPED);
535
536 release_sock(sk);
537 }
538
539 static void iucv_sock_init(struct sock *sk, struct sock *parent)
540 {
541 if (parent) {
542 sk->sk_type = parent->sk_type;
543 security_sk_clone(parent, sk);
544 }
545 }
546
547 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
548 {
549 struct sock *sk;
550 struct iucv_sock *iucv;
551
552 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
553 if (!sk)
554 return NULL;
555 iucv = iucv_sk(sk);
556
557 sock_init_data(sock, sk);
558 INIT_LIST_HEAD(&iucv->accept_q);
559 spin_lock_init(&iucv->accept_q_lock);
560 skb_queue_head_init(&iucv->send_skb_q);
561 INIT_LIST_HEAD(&iucv->message_q.list);
562 spin_lock_init(&iucv->message_q.lock);
563 skb_queue_head_init(&iucv->backlog_skb_q);
564 iucv->send_tag = 0;
565 atomic_set(&iucv->pendings, 0);
566 iucv->flags = 0;
567 iucv->msglimit = 0;
568 atomic_set(&iucv->msg_sent, 0);
569 atomic_set(&iucv->msg_recv, 0);
570 iucv->path = NULL;
571 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
572 memset(&iucv->src_user_id , 0, 32);
573 if (pr_iucv)
574 iucv->transport = AF_IUCV_TRANS_IUCV;
575 else
576 iucv->transport = AF_IUCV_TRANS_HIPER;
577
578 sk->sk_destruct = iucv_sock_destruct;
579 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
580 sk->sk_allocation = GFP_DMA;
581
582 sock_reset_flag(sk, SOCK_ZAPPED);
583
584 sk->sk_protocol = proto;
585 sk->sk_state = IUCV_OPEN;
586
587 iucv_sock_link(&iucv_sk_list, sk);
588 return sk;
589 }
590
591 /* Create an IUCV socket */
592 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
593 int kern)
594 {
595 struct sock *sk;
596
597 if (protocol && protocol != PF_IUCV)
598 return -EPROTONOSUPPORT;
599
600 sock->state = SS_UNCONNECTED;
601
602 switch (sock->type) {
603 case SOCK_STREAM:
604 sock->ops = &iucv_sock_ops;
605 break;
606 case SOCK_SEQPACKET:
607 /* currently, proto ops can handle both sk types */
608 sock->ops = &iucv_sock_ops;
609 break;
610 default:
611 return -ESOCKTNOSUPPORT;
612 }
613
614 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
615 if (!sk)
616 return -ENOMEM;
617
618 iucv_sock_init(sk, NULL);
619
620 return 0;
621 }
622
623 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
624 {
625 write_lock_bh(&l->lock);
626 sk_add_node(sk, &l->head);
627 write_unlock_bh(&l->lock);
628 }
629
630 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
631 {
632 write_lock_bh(&l->lock);
633 sk_del_node_init(sk);
634 write_unlock_bh(&l->lock);
635 }
636
637 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
638 {
639 unsigned long flags;
640 struct iucv_sock *par = iucv_sk(parent);
641
642 sock_hold(sk);
643 spin_lock_irqsave(&par->accept_q_lock, flags);
644 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
645 spin_unlock_irqrestore(&par->accept_q_lock, flags);
646 iucv_sk(sk)->parent = parent;
647 sk_acceptq_added(parent);
648 }
649
650 void iucv_accept_unlink(struct sock *sk)
651 {
652 unsigned long flags;
653 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
654
655 spin_lock_irqsave(&par->accept_q_lock, flags);
656 list_del_init(&iucv_sk(sk)->accept_q);
657 spin_unlock_irqrestore(&par->accept_q_lock, flags);
658 sk_acceptq_removed(iucv_sk(sk)->parent);
659 iucv_sk(sk)->parent = NULL;
660 sock_put(sk);
661 }
662
663 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
664 {
665 struct iucv_sock *isk, *n;
666 struct sock *sk;
667
668 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
669 sk = (struct sock *) isk;
670 lock_sock(sk);
671
672 if (sk->sk_state == IUCV_CLOSED) {
673 iucv_accept_unlink(sk);
674 release_sock(sk);
675 continue;
676 }
677
678 if (sk->sk_state == IUCV_CONNECTED ||
679 sk->sk_state == IUCV_DISCONN ||
680 !newsock) {
681 iucv_accept_unlink(sk);
682 if (newsock)
683 sock_graft(sk, newsock);
684
685 release_sock(sk);
686 return sk;
687 }
688
689 release_sock(sk);
690 }
691 return NULL;
692 }
693
694 static void __iucv_auto_name(struct iucv_sock *iucv)
695 {
696 char name[12];
697
698 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
699 while (__iucv_get_sock_by_name(name)) {
700 sprintf(name, "%08x",
701 atomic_inc_return(&iucv_sk_list.autobind_name));
702 }
703 memcpy(iucv->src_name, name, 8);
704 }
705
706 /* Bind an unbound socket */
707 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
708 int addr_len)
709 {
710 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
711 struct sock *sk = sock->sk;
712 struct iucv_sock *iucv;
713 int err = 0;
714 struct net_device *dev;
715 char uid[9];
716
717 /* Verify the input sockaddr */
718 if (addr_len < sizeof(struct sockaddr_iucv) ||
719 addr->sa_family != AF_IUCV)
720 return -EINVAL;
721
722 lock_sock(sk);
723 if (sk->sk_state != IUCV_OPEN) {
724 err = -EBADFD;
725 goto done;
726 }
727
728 write_lock_bh(&iucv_sk_list.lock);
729
730 iucv = iucv_sk(sk);
731 if (__iucv_get_sock_by_name(sa->siucv_name)) {
732 err = -EADDRINUSE;
733 goto done_unlock;
734 }
735 if (iucv->path)
736 goto done_unlock;
737
738 /* Bind the socket */
739 if (pr_iucv)
740 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
741 goto vm_bind; /* VM IUCV transport */
742
743 /* try hiper transport */
744 memcpy(uid, sa->siucv_user_id, sizeof(uid));
745 ASCEBC(uid, 8);
746 rcu_read_lock();
747 for_each_netdev_rcu(&init_net, dev) {
748 if (!memcmp(dev->perm_addr, uid, 8)) {
749 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
750 /* Check for unitialized siucv_name */
751 if (strncmp(sa->siucv_name, " ", 8) == 0)
752 __iucv_auto_name(iucv);
753 else
754 memcpy(iucv->src_name, sa->siucv_name, 8);
755 sk->sk_bound_dev_if = dev->ifindex;
756 iucv->hs_dev = dev;
757 dev_hold(dev);
758 sk->sk_state = IUCV_BOUND;
759 iucv->transport = AF_IUCV_TRANS_HIPER;
760 if (!iucv->msglimit)
761 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
762 rcu_read_unlock();
763 goto done_unlock;
764 }
765 }
766 rcu_read_unlock();
767 vm_bind:
768 if (pr_iucv) {
769 /* use local userid for backward compat */
770 memcpy(iucv->src_name, sa->siucv_name, 8);
771 memcpy(iucv->src_user_id, iucv_userid, 8);
772 sk->sk_state = IUCV_BOUND;
773 iucv->transport = AF_IUCV_TRANS_IUCV;
774 if (!iucv->msglimit)
775 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
776 goto done_unlock;
777 }
778 /* found no dev to bind */
779 err = -ENODEV;
780 done_unlock:
781 /* Release the socket list lock */
782 write_unlock_bh(&iucv_sk_list.lock);
783 done:
784 release_sock(sk);
785 return err;
786 }
787
788 /* Automatically bind an unbound socket */
789 static int iucv_sock_autobind(struct sock *sk)
790 {
791 struct iucv_sock *iucv = iucv_sk(sk);
792 int err = 0;
793
794 if (unlikely(!pr_iucv))
795 return -EPROTO;
796
797 memcpy(iucv->src_user_id, iucv_userid, 8);
798
799 write_lock_bh(&iucv_sk_list.lock);
800 __iucv_auto_name(iucv);
801 write_unlock_bh(&iucv_sk_list.lock);
802
803 if (!iucv->msglimit)
804 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
805
806 return err;
807 }
808
809 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
810 {
811 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
812 struct sock *sk = sock->sk;
813 struct iucv_sock *iucv = iucv_sk(sk);
814 unsigned char user_data[16];
815 int err;
816
817 high_nmcpy(user_data, sa->siucv_name);
818 low_nmcpy(user_data, iucv->src_name);
819 ASCEBC(user_data, sizeof(user_data));
820
821 /* Create path. */
822 iucv->path = iucv_path_alloc(iucv->msglimit,
823 IUCV_IPRMDATA, GFP_KERNEL);
824 if (!iucv->path) {
825 err = -ENOMEM;
826 goto done;
827 }
828 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
829 sa->siucv_user_id, NULL, user_data,
830 sk);
831 if (err) {
832 iucv_path_free(iucv->path);
833 iucv->path = NULL;
834 switch (err) {
835 case 0x0b: /* Target communicator is not logged on */
836 err = -ENETUNREACH;
837 break;
838 case 0x0d: /* Max connections for this guest exceeded */
839 case 0x0e: /* Max connections for target guest exceeded */
840 err = -EAGAIN;
841 break;
842 case 0x0f: /* Missing IUCV authorization */
843 err = -EACCES;
844 break;
845 default:
846 err = -ECONNREFUSED;
847 break;
848 }
849 }
850 done:
851 return err;
852 }
853
854 /* Connect an unconnected socket */
855 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
856 int alen, int flags)
857 {
858 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
859 struct sock *sk = sock->sk;
860 struct iucv_sock *iucv = iucv_sk(sk);
861 int err;
862
863 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
864 return -EINVAL;
865
866 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
867 return -EBADFD;
868
869 if (sk->sk_state == IUCV_OPEN &&
870 iucv->transport == AF_IUCV_TRANS_HIPER)
871 return -EBADFD; /* explicit bind required */
872
873 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
874 return -EINVAL;
875
876 if (sk->sk_state == IUCV_OPEN) {
877 err = iucv_sock_autobind(sk);
878 if (unlikely(err))
879 return err;
880 }
881
882 lock_sock(sk);
883
884 /* Set the destination information */
885 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
886 memcpy(iucv->dst_name, sa->siucv_name, 8);
887
888 if (iucv->transport == AF_IUCV_TRANS_HIPER)
889 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
890 else
891 err = afiucv_path_connect(sock, addr);
892 if (err)
893 goto done;
894
895 if (sk->sk_state != IUCV_CONNECTED)
896 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
897 IUCV_DISCONN),
898 sock_sndtimeo(sk, flags & O_NONBLOCK));
899
900 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
901 err = -ECONNREFUSED;
902
903 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
904 iucv_sever_path(sk, 0);
905
906 done:
907 release_sock(sk);
908 return err;
909 }
910
911 /* Move a socket into listening state. */
912 static int iucv_sock_listen(struct socket *sock, int backlog)
913 {
914 struct sock *sk = sock->sk;
915 int err;
916
917 lock_sock(sk);
918
919 err = -EINVAL;
920 if (sk->sk_state != IUCV_BOUND)
921 goto done;
922
923 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
924 goto done;
925
926 sk->sk_max_ack_backlog = backlog;
927 sk->sk_ack_backlog = 0;
928 sk->sk_state = IUCV_LISTEN;
929 err = 0;
930
931 done:
932 release_sock(sk);
933 return err;
934 }
935
936 /* Accept a pending connection */
937 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
938 int flags, bool kern)
939 {
940 DECLARE_WAITQUEUE(wait, current);
941 struct sock *sk = sock->sk, *nsk;
942 long timeo;
943 int err = 0;
944
945 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
946
947 if (sk->sk_state != IUCV_LISTEN) {
948 err = -EBADFD;
949 goto done;
950 }
951
952 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
953
954 /* Wait for an incoming connection */
955 add_wait_queue_exclusive(sk_sleep(sk), &wait);
956 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
957 set_current_state(TASK_INTERRUPTIBLE);
958 if (!timeo) {
959 err = -EAGAIN;
960 break;
961 }
962
963 release_sock(sk);
964 timeo = schedule_timeout(timeo);
965 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
966
967 if (sk->sk_state != IUCV_LISTEN) {
968 err = -EBADFD;
969 break;
970 }
971
972 if (signal_pending(current)) {
973 err = sock_intr_errno(timeo);
974 break;
975 }
976 }
977
978 set_current_state(TASK_RUNNING);
979 remove_wait_queue(sk_sleep(sk), &wait);
980
981 if (err)
982 goto done;
983
984 newsock->state = SS_CONNECTED;
985
986 done:
987 release_sock(sk);
988 return err;
989 }
990
991 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
992 int *len, int peer)
993 {
994 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
995 struct sock *sk = sock->sk;
996 struct iucv_sock *iucv = iucv_sk(sk);
997
998 addr->sa_family = AF_IUCV;
999 *len = sizeof(struct sockaddr_iucv);
1000
1001 if (peer) {
1002 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1003 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1004 } else {
1005 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1006 memcpy(siucv->siucv_name, iucv->src_name, 8);
1007 }
1008 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1009 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1010 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1011
1012 return 0;
1013 }
1014
1015 /**
1016 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1017 * @path: IUCV path
1018 * @msg: Pointer to a struct iucv_message
1019 * @skb: The socket data to send, skb->len MUST BE <= 7
1020 *
1021 * Send the socket data in the parameter list in the iucv message
1022 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1023 * list and the socket data len at index 7 (last byte).
1024 * See also iucv_msg_length().
1025 *
1026 * Returns the error code from the iucv_message_send() call.
1027 */
1028 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1029 struct sk_buff *skb)
1030 {
1031 u8 prmdata[8];
1032
1033 memcpy(prmdata, (void *) skb->data, skb->len);
1034 prmdata[7] = 0xff - (u8) skb->len;
1035 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1036 (void *) prmdata, 8);
1037 }
1038
1039 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1040 size_t len)
1041 {
1042 struct sock *sk = sock->sk;
1043 struct iucv_sock *iucv = iucv_sk(sk);
1044 size_t headroom = 0;
1045 size_t linear;
1046 struct sk_buff *skb;
1047 struct iucv_message txmsg = {0};
1048 struct cmsghdr *cmsg;
1049 int cmsg_done;
1050 long timeo;
1051 char user_id[9];
1052 char appl_id[9];
1053 int err;
1054 int noblock = msg->msg_flags & MSG_DONTWAIT;
1055
1056 err = sock_error(sk);
1057 if (err)
1058 return err;
1059
1060 if (msg->msg_flags & MSG_OOB)
1061 return -EOPNOTSUPP;
1062
1063 /* SOCK_SEQPACKET: we do not support segmented records */
1064 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1065 return -EOPNOTSUPP;
1066
1067 lock_sock(sk);
1068
1069 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1070 err = -EPIPE;
1071 goto out;
1072 }
1073
1074 /* Return if the socket is not in connected state */
1075 if (sk->sk_state != IUCV_CONNECTED) {
1076 err = -ENOTCONN;
1077 goto out;
1078 }
1079
1080 /* initialize defaults */
1081 cmsg_done = 0; /* check for duplicate headers */
1082 txmsg.class = 0;
1083
1084 /* iterate over control messages */
1085 for_each_cmsghdr(cmsg, msg) {
1086 if (!CMSG_OK(msg, cmsg)) {
1087 err = -EINVAL;
1088 goto out;
1089 }
1090
1091 if (cmsg->cmsg_level != SOL_IUCV)
1092 continue;
1093
1094 if (cmsg->cmsg_type & cmsg_done) {
1095 err = -EINVAL;
1096 goto out;
1097 }
1098 cmsg_done |= cmsg->cmsg_type;
1099
1100 switch (cmsg->cmsg_type) {
1101 case SCM_IUCV_TRGCLS:
1102 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1103 err = -EINVAL;
1104 goto out;
1105 }
1106
1107 /* set iucv message target class */
1108 memcpy(&txmsg.class,
1109 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1110
1111 break;
1112
1113 default:
1114 err = -EINVAL;
1115 goto out;
1116 }
1117 }
1118
1119 /* allocate one skb for each iucv message:
1120 * this is fine for SOCK_SEQPACKET (unless we want to support
1121 * segmented records using the MSG_EOR flag), but
1122 * for SOCK_STREAM we might want to improve it in future */
1123 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1124 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1125 linear = len;
1126 } else {
1127 if (len < PAGE_SIZE) {
1128 linear = len;
1129 } else {
1130 /* In nonlinear "classic" iucv skb,
1131 * reserve space for iucv_array
1132 */
1133 headroom = sizeof(struct iucv_array) *
1134 (MAX_SKB_FRAGS + 1);
1135 linear = PAGE_SIZE - headroom;
1136 }
1137 }
1138 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1139 noblock, &err, 0);
1140 if (!skb)
1141 goto out;
1142 if (headroom)
1143 skb_reserve(skb, headroom);
1144 skb_put(skb, linear);
1145 skb->len = len;
1146 skb->data_len = len - linear;
1147 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1148 if (err)
1149 goto fail;
1150
1151 /* wait if outstanding messages for iucv path has reached */
1152 timeo = sock_sndtimeo(sk, noblock);
1153 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1154 if (err)
1155 goto fail;
1156
1157 /* return -ECONNRESET if the socket is no longer connected */
1158 if (sk->sk_state != IUCV_CONNECTED) {
1159 err = -ECONNRESET;
1160 goto fail;
1161 }
1162
1163 /* increment and save iucv message tag for msg_completion cbk */
1164 txmsg.tag = iucv->send_tag++;
1165 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1166
1167 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1168 atomic_inc(&iucv->msg_sent);
1169 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1170 if (err) {
1171 atomic_dec(&iucv->msg_sent);
1172 goto fail;
1173 }
1174 } else { /* Classic VM IUCV transport */
1175 skb_queue_tail(&iucv->send_skb_q, skb);
1176
1177 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1178 skb->len <= 7) {
1179 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1180
1181 /* on success: there is no message_complete callback */
1182 /* for an IPRMDATA msg; remove skb from send queue */
1183 if (err == 0) {
1184 skb_unlink(skb, &iucv->send_skb_q);
1185 kfree_skb(skb);
1186 }
1187
1188 /* this error should never happen since the */
1189 /* IUCV_IPRMDATA path flag is set... sever path */
1190 if (err == 0x15) {
1191 pr_iucv->path_sever(iucv->path, NULL);
1192 skb_unlink(skb, &iucv->send_skb_q);
1193 err = -EPIPE;
1194 goto fail;
1195 }
1196 } else if (skb_is_nonlinear(skb)) {
1197 struct iucv_array *iba = (struct iucv_array *)skb->head;
1198 int i;
1199
1200 /* skip iucv_array lying in the headroom */
1201 iba[0].address = (u32)(addr_t)skb->data;
1202 iba[0].length = (u32)skb_headlen(skb);
1203 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1204 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1205
1206 iba[i + 1].address =
1207 (u32)(addr_t)skb_frag_address(frag);
1208 iba[i + 1].length = (u32)skb_frag_size(frag);
1209 }
1210 err = pr_iucv->message_send(iucv->path, &txmsg,
1211 IUCV_IPBUFLST, 0,
1212 (void *)iba, skb->len);
1213 } else { /* non-IPRM Linear skb */
1214 err = pr_iucv->message_send(iucv->path, &txmsg,
1215 0, 0, (void *)skb->data, skb->len);
1216 }
1217 if (err) {
1218 if (err == 3) {
1219 user_id[8] = 0;
1220 memcpy(user_id, iucv->dst_user_id, 8);
1221 appl_id[8] = 0;
1222 memcpy(appl_id, iucv->dst_name, 8);
1223 pr_err(
1224 "Application %s on z/VM guest %s exceeds message limit\n",
1225 appl_id, user_id);
1226 err = -EAGAIN;
1227 } else {
1228 err = -EPIPE;
1229 }
1230 skb_unlink(skb, &iucv->send_skb_q);
1231 goto fail;
1232 }
1233 }
1234
1235 release_sock(sk);
1236 return len;
1237
1238 fail:
1239 kfree_skb(skb);
1240 out:
1241 release_sock(sk);
1242 return err;
1243 }
1244
1245 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1246 {
1247 size_t headroom, linear;
1248 struct sk_buff *skb;
1249 int err;
1250
1251 if (len < PAGE_SIZE) {
1252 headroom = 0;
1253 linear = len;
1254 } else {
1255 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1256 linear = PAGE_SIZE - headroom;
1257 }
1258 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1259 0, &err, GFP_ATOMIC | GFP_DMA);
1260 WARN_ONCE(!skb,
1261 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1262 len, err);
1263 if (skb) {
1264 if (headroom)
1265 skb_reserve(skb, headroom);
1266 skb_put(skb, linear);
1267 skb->len = len;
1268 skb->data_len = len - linear;
1269 }
1270 return skb;
1271 }
1272
1273 /* iucv_process_message() - Receive a single outstanding IUCV message
1274 *
1275 * Locking: must be called with message_q.lock held
1276 */
1277 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1278 struct iucv_path *path,
1279 struct iucv_message *msg)
1280 {
1281 int rc;
1282 unsigned int len;
1283
1284 len = iucv_msg_length(msg);
1285
1286 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1287 /* Note: the first 4 bytes are reserved for msg tag */
1288 IUCV_SKB_CB(skb)->class = msg->class;
1289
1290 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1291 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1292 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1293 skb->data = NULL;
1294 skb->len = 0;
1295 }
1296 } else {
1297 if (skb_is_nonlinear(skb)) {
1298 struct iucv_array *iba = (struct iucv_array *)skb->head;
1299 int i;
1300
1301 iba[0].address = (u32)(addr_t)skb->data;
1302 iba[0].length = (u32)skb_headlen(skb);
1303 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1304 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1305
1306 iba[i + 1].address =
1307 (u32)(addr_t)skb_frag_address(frag);
1308 iba[i + 1].length = (u32)skb_frag_size(frag);
1309 }
1310 rc = pr_iucv->message_receive(path, msg,
1311 IUCV_IPBUFLST,
1312 (void *)iba, len, NULL);
1313 } else {
1314 rc = pr_iucv->message_receive(path, msg,
1315 msg->flags & IUCV_IPRMDATA,
1316 skb->data, len, NULL);
1317 }
1318 if (rc) {
1319 kfree_skb(skb);
1320 return;
1321 }
1322 WARN_ON_ONCE(skb->len != len);
1323 }
1324
1325 IUCV_SKB_CB(skb)->offset = 0;
1326 if (sk_filter(sk, skb)) {
1327 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1328 kfree_skb(skb);
1329 return;
1330 }
1331 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1332 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1333 }
1334
1335 /* iucv_process_message_q() - Process outstanding IUCV messages
1336 *
1337 * Locking: must be called with message_q.lock held
1338 */
1339 static void iucv_process_message_q(struct sock *sk)
1340 {
1341 struct iucv_sock *iucv = iucv_sk(sk);
1342 struct sk_buff *skb;
1343 struct sock_msg_q *p, *n;
1344
1345 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1346 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1347 if (!skb)
1348 break;
1349 iucv_process_message(sk, skb, p->path, &p->msg);
1350 list_del(&p->list);
1351 kfree(p);
1352 if (!skb_queue_empty(&iucv->backlog_skb_q))
1353 break;
1354 }
1355 }
1356
1357 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1358 size_t len, int flags)
1359 {
1360 int noblock = flags & MSG_DONTWAIT;
1361 struct sock *sk = sock->sk;
1362 struct iucv_sock *iucv = iucv_sk(sk);
1363 unsigned int copied, rlen;
1364 struct sk_buff *skb, *rskb, *cskb;
1365 int err = 0;
1366 u32 offset;
1367
1368 if ((sk->sk_state == IUCV_DISCONN) &&
1369 skb_queue_empty(&iucv->backlog_skb_q) &&
1370 skb_queue_empty(&sk->sk_receive_queue) &&
1371 list_empty(&iucv->message_q.list))
1372 return 0;
1373
1374 if (flags & (MSG_OOB))
1375 return -EOPNOTSUPP;
1376
1377 /* receive/dequeue next skb:
1378 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1379 skb = skb_recv_datagram(sk, flags, noblock, &err);
1380 if (!skb) {
1381 if (sk->sk_shutdown & RCV_SHUTDOWN)
1382 return 0;
1383 return err;
1384 }
1385
1386 offset = IUCV_SKB_CB(skb)->offset;
1387 rlen = skb->len - offset; /* real length of skb */
1388 copied = min_t(unsigned int, rlen, len);
1389 if (!rlen)
1390 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1391
1392 cskb = skb;
1393 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1394 if (!(flags & MSG_PEEK))
1395 skb_queue_head(&sk->sk_receive_queue, skb);
1396 return -EFAULT;
1397 }
1398
1399 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1400 if (sk->sk_type == SOCK_SEQPACKET) {
1401 if (copied < rlen)
1402 msg->msg_flags |= MSG_TRUNC;
1403 /* each iucv message contains a complete record */
1404 msg->msg_flags |= MSG_EOR;
1405 }
1406
1407 /* create control message to store iucv msg target class:
1408 * get the trgcls from the control buffer of the skb due to
1409 * fragmentation of original iucv message. */
1410 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1411 sizeof(IUCV_SKB_CB(skb)->class),
1412 (void *)&IUCV_SKB_CB(skb)->class);
1413 if (err) {
1414 if (!(flags & MSG_PEEK))
1415 skb_queue_head(&sk->sk_receive_queue, skb);
1416 return err;
1417 }
1418
1419 /* Mark read part of skb as used */
1420 if (!(flags & MSG_PEEK)) {
1421
1422 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1423 if (sk->sk_type == SOCK_STREAM) {
1424 if (copied < rlen) {
1425 IUCV_SKB_CB(skb)->offset = offset + copied;
1426 skb_queue_head(&sk->sk_receive_queue, skb);
1427 goto done;
1428 }
1429 }
1430
1431 kfree_skb(skb);
1432 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1433 atomic_inc(&iucv->msg_recv);
1434 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1435 WARN_ON(1);
1436 iucv_sock_close(sk);
1437 return -EFAULT;
1438 }
1439 }
1440
1441 /* Queue backlog skbs */
1442 spin_lock_bh(&iucv->message_q.lock);
1443 rskb = skb_dequeue(&iucv->backlog_skb_q);
1444 while (rskb) {
1445 IUCV_SKB_CB(rskb)->offset = 0;
1446 if (__sock_queue_rcv_skb(sk, rskb)) {
1447 /* handle rcv queue full */
1448 skb_queue_head(&iucv->backlog_skb_q,
1449 rskb);
1450 break;
1451 }
1452 rskb = skb_dequeue(&iucv->backlog_skb_q);
1453 }
1454 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1455 if (!list_empty(&iucv->message_q.list))
1456 iucv_process_message_q(sk);
1457 if (atomic_read(&iucv->msg_recv) >=
1458 iucv->msglimit / 2) {
1459 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1460 if (err) {
1461 sk->sk_state = IUCV_DISCONN;
1462 sk->sk_state_change(sk);
1463 }
1464 }
1465 }
1466 spin_unlock_bh(&iucv->message_q.lock);
1467 }
1468
1469 done:
1470 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1471 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1472 copied = rlen;
1473
1474 return copied;
1475 }
1476
1477 static inline __poll_t iucv_accept_poll(struct sock *parent)
1478 {
1479 struct iucv_sock *isk, *n;
1480 struct sock *sk;
1481
1482 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1483 sk = (struct sock *) isk;
1484
1485 if (sk->sk_state == IUCV_CONNECTED)
1486 return EPOLLIN | EPOLLRDNORM;
1487 }
1488
1489 return 0;
1490 }
1491
1492 __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1493 poll_table *wait)
1494 {
1495 struct sock *sk = sock->sk;
1496 __poll_t mask = 0;
1497
1498 sock_poll_wait(file, sk_sleep(sk), wait);
1499
1500 if (sk->sk_state == IUCV_LISTEN)
1501 return iucv_accept_poll(sk);
1502
1503 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1504 mask |= EPOLLERR |
1505 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1506
1507 if (sk->sk_shutdown & RCV_SHUTDOWN)
1508 mask |= EPOLLRDHUP;
1509
1510 if (sk->sk_shutdown == SHUTDOWN_MASK)
1511 mask |= EPOLLHUP;
1512
1513 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1514 (sk->sk_shutdown & RCV_SHUTDOWN))
1515 mask |= EPOLLIN | EPOLLRDNORM;
1516
1517 if (sk->sk_state == IUCV_CLOSED)
1518 mask |= EPOLLHUP;
1519
1520 if (sk->sk_state == IUCV_DISCONN)
1521 mask |= EPOLLIN;
1522
1523 if (sock_writeable(sk) && iucv_below_msglim(sk))
1524 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1525 else
1526 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1527
1528 return mask;
1529 }
1530
1531 static int iucv_sock_shutdown(struct socket *sock, int how)
1532 {
1533 struct sock *sk = sock->sk;
1534 struct iucv_sock *iucv = iucv_sk(sk);
1535 struct iucv_message txmsg;
1536 int err = 0;
1537
1538 how++;
1539
1540 if ((how & ~SHUTDOWN_MASK) || !how)
1541 return -EINVAL;
1542
1543 lock_sock(sk);
1544 switch (sk->sk_state) {
1545 case IUCV_LISTEN:
1546 case IUCV_DISCONN:
1547 case IUCV_CLOSING:
1548 case IUCV_CLOSED:
1549 err = -ENOTCONN;
1550 goto fail;
1551 default:
1552 break;
1553 }
1554
1555 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1556 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1557 txmsg.class = 0;
1558 txmsg.tag = 0;
1559 err = pr_iucv->message_send(iucv->path, &txmsg,
1560 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1561 if (err) {
1562 switch (err) {
1563 case 1:
1564 err = -ENOTCONN;
1565 break;
1566 case 2:
1567 err = -ECONNRESET;
1568 break;
1569 default:
1570 err = -ENOTCONN;
1571 break;
1572 }
1573 }
1574 } else
1575 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1576 }
1577
1578 sk->sk_shutdown |= how;
1579 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1580 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1581 iucv->path) {
1582 err = pr_iucv->path_quiesce(iucv->path, NULL);
1583 if (err)
1584 err = -ENOTCONN;
1585 /* skb_queue_purge(&sk->sk_receive_queue); */
1586 }
1587 skb_queue_purge(&sk->sk_receive_queue);
1588 }
1589
1590 /* Wake up anyone sleeping in poll */
1591 sk->sk_state_change(sk);
1592
1593 fail:
1594 release_sock(sk);
1595 return err;
1596 }
1597
1598 static int iucv_sock_release(struct socket *sock)
1599 {
1600 struct sock *sk = sock->sk;
1601 int err = 0;
1602
1603 if (!sk)
1604 return 0;
1605
1606 iucv_sock_close(sk);
1607
1608 sock_orphan(sk);
1609 iucv_sock_kill(sk);
1610 return err;
1611 }
1612
1613 /* getsockopt and setsockopt */
1614 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1615 char __user *optval, unsigned int optlen)
1616 {
1617 struct sock *sk = sock->sk;
1618 struct iucv_sock *iucv = iucv_sk(sk);
1619 int val;
1620 int rc;
1621
1622 if (level != SOL_IUCV)
1623 return -ENOPROTOOPT;
1624
1625 if (optlen < sizeof(int))
1626 return -EINVAL;
1627
1628 if (get_user(val, (int __user *) optval))
1629 return -EFAULT;
1630
1631 rc = 0;
1632
1633 lock_sock(sk);
1634 switch (optname) {
1635 case SO_IPRMDATA_MSG:
1636 if (val)
1637 iucv->flags |= IUCV_IPRMDATA;
1638 else
1639 iucv->flags &= ~IUCV_IPRMDATA;
1640 break;
1641 case SO_MSGLIMIT:
1642 switch (sk->sk_state) {
1643 case IUCV_OPEN:
1644 case IUCV_BOUND:
1645 if (val < 1 || val > (u16)(~0))
1646 rc = -EINVAL;
1647 else
1648 iucv->msglimit = val;
1649 break;
1650 default:
1651 rc = -EINVAL;
1652 break;
1653 }
1654 break;
1655 default:
1656 rc = -ENOPROTOOPT;
1657 break;
1658 }
1659 release_sock(sk);
1660
1661 return rc;
1662 }
1663
1664 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1665 char __user *optval, int __user *optlen)
1666 {
1667 struct sock *sk = sock->sk;
1668 struct iucv_sock *iucv = iucv_sk(sk);
1669 unsigned int val;
1670 int len;
1671
1672 if (level != SOL_IUCV)
1673 return -ENOPROTOOPT;
1674
1675 if (get_user(len, optlen))
1676 return -EFAULT;
1677
1678 if (len < 0)
1679 return -EINVAL;
1680
1681 len = min_t(unsigned int, len, sizeof(int));
1682
1683 switch (optname) {
1684 case SO_IPRMDATA_MSG:
1685 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1686 break;
1687 case SO_MSGLIMIT:
1688 lock_sock(sk);
1689 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1690 : iucv->msglimit; /* default */
1691 release_sock(sk);
1692 break;
1693 case SO_MSGSIZE:
1694 if (sk->sk_state == IUCV_OPEN)
1695 return -EBADFD;
1696 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1697 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1698 0x7fffffff;
1699 break;
1700 default:
1701 return -ENOPROTOOPT;
1702 }
1703
1704 if (put_user(len, optlen))
1705 return -EFAULT;
1706 if (copy_to_user(optval, &val, len))
1707 return -EFAULT;
1708
1709 return 0;
1710 }
1711
1712
1713 /* Callback wrappers - called from iucv base support */
1714 static int iucv_callback_connreq(struct iucv_path *path,
1715 u8 ipvmid[8], u8 ipuser[16])
1716 {
1717 unsigned char user_data[16];
1718 unsigned char nuser_data[16];
1719 unsigned char src_name[8];
1720 struct sock *sk, *nsk;
1721 struct iucv_sock *iucv, *niucv;
1722 int err;
1723
1724 memcpy(src_name, ipuser, 8);
1725 EBCASC(src_name, 8);
1726 /* Find out if this path belongs to af_iucv. */
1727 read_lock(&iucv_sk_list.lock);
1728 iucv = NULL;
1729 sk = NULL;
1730 sk_for_each(sk, &iucv_sk_list.head)
1731 if (sk->sk_state == IUCV_LISTEN &&
1732 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1733 /*
1734 * Found a listening socket with
1735 * src_name == ipuser[0-7].
1736 */
1737 iucv = iucv_sk(sk);
1738 break;
1739 }
1740 read_unlock(&iucv_sk_list.lock);
1741 if (!iucv)
1742 /* No socket found, not one of our paths. */
1743 return -EINVAL;
1744
1745 bh_lock_sock(sk);
1746
1747 /* Check if parent socket is listening */
1748 low_nmcpy(user_data, iucv->src_name);
1749 high_nmcpy(user_data, iucv->dst_name);
1750 ASCEBC(user_data, sizeof(user_data));
1751 if (sk->sk_state != IUCV_LISTEN) {
1752 err = pr_iucv->path_sever(path, user_data);
1753 iucv_path_free(path);
1754 goto fail;
1755 }
1756
1757 /* Check for backlog size */
1758 if (sk_acceptq_is_full(sk)) {
1759 err = pr_iucv->path_sever(path, user_data);
1760 iucv_path_free(path);
1761 goto fail;
1762 }
1763
1764 /* Create the new socket */
1765 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1766 if (!nsk) {
1767 err = pr_iucv->path_sever(path, user_data);
1768 iucv_path_free(path);
1769 goto fail;
1770 }
1771
1772 niucv = iucv_sk(nsk);
1773 iucv_sock_init(nsk, sk);
1774
1775 /* Set the new iucv_sock */
1776 memcpy(niucv->dst_name, ipuser + 8, 8);
1777 EBCASC(niucv->dst_name, 8);
1778 memcpy(niucv->dst_user_id, ipvmid, 8);
1779 memcpy(niucv->src_name, iucv->src_name, 8);
1780 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1781 niucv->path = path;
1782
1783 /* Call iucv_accept */
1784 high_nmcpy(nuser_data, ipuser + 8);
1785 memcpy(nuser_data + 8, niucv->src_name, 8);
1786 ASCEBC(nuser_data + 8, 8);
1787
1788 /* set message limit for path based on msglimit of accepting socket */
1789 niucv->msglimit = iucv->msglimit;
1790 path->msglim = iucv->msglimit;
1791 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1792 if (err) {
1793 iucv_sever_path(nsk, 1);
1794 iucv_sock_kill(nsk);
1795 goto fail;
1796 }
1797
1798 iucv_accept_enqueue(sk, nsk);
1799
1800 /* Wake up accept */
1801 nsk->sk_state = IUCV_CONNECTED;
1802 sk->sk_data_ready(sk);
1803 err = 0;
1804 fail:
1805 bh_unlock_sock(sk);
1806 return 0;
1807 }
1808
1809 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1810 {
1811 struct sock *sk = path->private;
1812
1813 sk->sk_state = IUCV_CONNECTED;
1814 sk->sk_state_change(sk);
1815 }
1816
1817 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1818 {
1819 struct sock *sk = path->private;
1820 struct iucv_sock *iucv = iucv_sk(sk);
1821 struct sk_buff *skb;
1822 struct sock_msg_q *save_msg;
1823 int len;
1824
1825 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1826 pr_iucv->message_reject(path, msg);
1827 return;
1828 }
1829
1830 spin_lock(&iucv->message_q.lock);
1831
1832 if (!list_empty(&iucv->message_q.list) ||
1833 !skb_queue_empty(&iucv->backlog_skb_q))
1834 goto save_message;
1835
1836 len = atomic_read(&sk->sk_rmem_alloc);
1837 len += SKB_TRUESIZE(iucv_msg_length(msg));
1838 if (len > sk->sk_rcvbuf)
1839 goto save_message;
1840
1841 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1842 if (!skb)
1843 goto save_message;
1844
1845 iucv_process_message(sk, skb, path, msg);
1846 goto out_unlock;
1847
1848 save_message:
1849 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1850 if (!save_msg)
1851 goto out_unlock;
1852 save_msg->path = path;
1853 save_msg->msg = *msg;
1854
1855 list_add_tail(&save_msg->list, &iucv->message_q.list);
1856
1857 out_unlock:
1858 spin_unlock(&iucv->message_q.lock);
1859 }
1860
1861 static void iucv_callback_txdone(struct iucv_path *path,
1862 struct iucv_message *msg)
1863 {
1864 struct sock *sk = path->private;
1865 struct sk_buff *this = NULL;
1866 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1867 struct sk_buff *list_skb = list->next;
1868 unsigned long flags;
1869
1870 bh_lock_sock(sk);
1871 if (!skb_queue_empty(list)) {
1872 spin_lock_irqsave(&list->lock, flags);
1873
1874 while (list_skb != (struct sk_buff *)list) {
1875 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1876 this = list_skb;
1877 break;
1878 }
1879 list_skb = list_skb->next;
1880 }
1881 if (this)
1882 __skb_unlink(this, list);
1883
1884 spin_unlock_irqrestore(&list->lock, flags);
1885
1886 if (this) {
1887 kfree_skb(this);
1888 /* wake up any process waiting for sending */
1889 iucv_sock_wake_msglim(sk);
1890 }
1891 }
1892
1893 if (sk->sk_state == IUCV_CLOSING) {
1894 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1895 sk->sk_state = IUCV_CLOSED;
1896 sk->sk_state_change(sk);
1897 }
1898 }
1899 bh_unlock_sock(sk);
1900
1901 }
1902
1903 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1904 {
1905 struct sock *sk = path->private;
1906
1907 if (sk->sk_state == IUCV_CLOSED)
1908 return;
1909
1910 bh_lock_sock(sk);
1911 iucv_sever_path(sk, 1);
1912 sk->sk_state = IUCV_DISCONN;
1913
1914 sk->sk_state_change(sk);
1915 bh_unlock_sock(sk);
1916 }
1917
1918 /* called if the other communication side shuts down its RECV direction;
1919 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1920 */
1921 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1922 {
1923 struct sock *sk = path->private;
1924
1925 bh_lock_sock(sk);
1926 if (sk->sk_state != IUCV_CLOSED) {
1927 sk->sk_shutdown |= SEND_SHUTDOWN;
1928 sk->sk_state_change(sk);
1929 }
1930 bh_unlock_sock(sk);
1931 }
1932
1933 /***************** HiperSockets transport callbacks ********************/
1934 static void afiucv_swap_src_dest(struct sk_buff *skb)
1935 {
1936 struct af_iucv_trans_hdr *trans_hdr =
1937 (struct af_iucv_trans_hdr *)skb->data;
1938 char tmpID[8];
1939 char tmpName[8];
1940
1941 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1942 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1943 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1944 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1945 memcpy(tmpID, trans_hdr->srcUserID, 8);
1946 memcpy(tmpName, trans_hdr->srcAppName, 8);
1947 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1948 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1949 memcpy(trans_hdr->destUserID, tmpID, 8);
1950 memcpy(trans_hdr->destAppName, tmpName, 8);
1951 skb_push(skb, ETH_HLEN);
1952 memset(skb->data, 0, ETH_HLEN);
1953 }
1954
1955 /**
1956 * afiucv_hs_callback_syn - react on received SYN
1957 **/
1958 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1959 {
1960 struct sock *nsk;
1961 struct iucv_sock *iucv, *niucv;
1962 struct af_iucv_trans_hdr *trans_hdr;
1963 int err;
1964
1965 iucv = iucv_sk(sk);
1966 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1967 if (!iucv) {
1968 /* no sock - connection refused */
1969 afiucv_swap_src_dest(skb);
1970 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1971 err = dev_queue_xmit(skb);
1972 goto out;
1973 }
1974
1975 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1976 bh_lock_sock(sk);
1977 if ((sk->sk_state != IUCV_LISTEN) ||
1978 sk_acceptq_is_full(sk) ||
1979 !nsk) {
1980 /* error on server socket - connection refused */
1981 afiucv_swap_src_dest(skb);
1982 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1983 err = dev_queue_xmit(skb);
1984 iucv_sock_kill(nsk);
1985 bh_unlock_sock(sk);
1986 goto out;
1987 }
1988
1989 niucv = iucv_sk(nsk);
1990 iucv_sock_init(nsk, sk);
1991 niucv->transport = AF_IUCV_TRANS_HIPER;
1992 niucv->msglimit = iucv->msglimit;
1993 if (!trans_hdr->window)
1994 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1995 else
1996 niucv->msglimit_peer = trans_hdr->window;
1997 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1998 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1999 memcpy(niucv->src_name, iucv->src_name, 8);
2000 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2001 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2002 niucv->hs_dev = iucv->hs_dev;
2003 dev_hold(niucv->hs_dev);
2004 afiucv_swap_src_dest(skb);
2005 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2006 trans_hdr->window = niucv->msglimit;
2007 /* if receiver acks the xmit connection is established */
2008 err = dev_queue_xmit(skb);
2009 if (!err) {
2010 iucv_accept_enqueue(sk, nsk);
2011 nsk->sk_state = IUCV_CONNECTED;
2012 sk->sk_data_ready(sk);
2013 } else
2014 iucv_sock_kill(nsk);
2015 bh_unlock_sock(sk);
2016
2017 out:
2018 return NET_RX_SUCCESS;
2019 }
2020
2021 /**
2022 * afiucv_hs_callback_synack() - react on received SYN-ACK
2023 **/
2024 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2025 {
2026 struct iucv_sock *iucv = iucv_sk(sk);
2027 struct af_iucv_trans_hdr *trans_hdr =
2028 (struct af_iucv_trans_hdr *)skb->data;
2029
2030 if (!iucv)
2031 goto out;
2032 if (sk->sk_state != IUCV_BOUND)
2033 goto out;
2034 bh_lock_sock(sk);
2035 iucv->msglimit_peer = trans_hdr->window;
2036 sk->sk_state = IUCV_CONNECTED;
2037 sk->sk_state_change(sk);
2038 bh_unlock_sock(sk);
2039 out:
2040 kfree_skb(skb);
2041 return NET_RX_SUCCESS;
2042 }
2043
2044 /**
2045 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2046 **/
2047 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2048 {
2049 struct iucv_sock *iucv = iucv_sk(sk);
2050
2051 if (!iucv)
2052 goto out;
2053 if (sk->sk_state != IUCV_BOUND)
2054 goto out;
2055 bh_lock_sock(sk);
2056 sk->sk_state = IUCV_DISCONN;
2057 sk->sk_state_change(sk);
2058 bh_unlock_sock(sk);
2059 out:
2060 kfree_skb(skb);
2061 return NET_RX_SUCCESS;
2062 }
2063
2064 /**
2065 * afiucv_hs_callback_fin() - react on received FIN
2066 **/
2067 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2068 {
2069 struct iucv_sock *iucv = iucv_sk(sk);
2070
2071 /* other end of connection closed */
2072 if (!iucv)
2073 goto out;
2074 bh_lock_sock(sk);
2075 if (sk->sk_state == IUCV_CONNECTED) {
2076 sk->sk_state = IUCV_DISCONN;
2077 sk->sk_state_change(sk);
2078 }
2079 bh_unlock_sock(sk);
2080 out:
2081 kfree_skb(skb);
2082 return NET_RX_SUCCESS;
2083 }
2084
2085 /**
2086 * afiucv_hs_callback_win() - react on received WIN
2087 **/
2088 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2089 {
2090 struct iucv_sock *iucv = iucv_sk(sk);
2091 struct af_iucv_trans_hdr *trans_hdr =
2092 (struct af_iucv_trans_hdr *)skb->data;
2093
2094 if (!iucv)
2095 return NET_RX_SUCCESS;
2096
2097 if (sk->sk_state != IUCV_CONNECTED)
2098 return NET_RX_SUCCESS;
2099
2100 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2101 iucv_sock_wake_msglim(sk);
2102 return NET_RX_SUCCESS;
2103 }
2104
2105 /**
2106 * afiucv_hs_callback_rx() - react on received data
2107 **/
2108 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2109 {
2110 struct iucv_sock *iucv = iucv_sk(sk);
2111
2112 if (!iucv) {
2113 kfree_skb(skb);
2114 return NET_RX_SUCCESS;
2115 }
2116
2117 if (sk->sk_state != IUCV_CONNECTED) {
2118 kfree_skb(skb);
2119 return NET_RX_SUCCESS;
2120 }
2121
2122 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2123 kfree_skb(skb);
2124 return NET_RX_SUCCESS;
2125 }
2126
2127 /* write stuff from iucv_msg to skb cb */
2128 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2129 skb_reset_transport_header(skb);
2130 skb_reset_network_header(skb);
2131 IUCV_SKB_CB(skb)->offset = 0;
2132 if (sk_filter(sk, skb)) {
2133 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2134 kfree_skb(skb);
2135 return NET_RX_SUCCESS;
2136 }
2137
2138 spin_lock(&iucv->message_q.lock);
2139 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2140 if (__sock_queue_rcv_skb(sk, skb))
2141 /* handle rcv queue full */
2142 skb_queue_tail(&iucv->backlog_skb_q, skb);
2143 } else
2144 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2145 spin_unlock(&iucv->message_q.lock);
2146 return NET_RX_SUCCESS;
2147 }
2148
2149 /**
2150 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2151 * transport
2152 * called from netif RX softirq
2153 **/
2154 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2155 struct packet_type *pt, struct net_device *orig_dev)
2156 {
2157 struct sock *sk;
2158 struct iucv_sock *iucv;
2159 struct af_iucv_trans_hdr *trans_hdr;
2160 char nullstring[8];
2161 int err = 0;
2162
2163 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2164 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2165 (int)skb->len,
2166 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2167 kfree_skb(skb);
2168 return NET_RX_SUCCESS;
2169 }
2170 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2171 if (skb_linearize(skb)) {
2172 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2173 (int)skb->len);
2174 kfree_skb(skb);
2175 return NET_RX_SUCCESS;
2176 }
2177 skb_pull(skb, ETH_HLEN);
2178 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2179 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2180 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2181 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2182 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2183 memset(nullstring, 0, sizeof(nullstring));
2184 iucv = NULL;
2185 sk = NULL;
2186 read_lock(&iucv_sk_list.lock);
2187 sk_for_each(sk, &iucv_sk_list.head) {
2188 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2189 if ((!memcmp(&iucv_sk(sk)->src_name,
2190 trans_hdr->destAppName, 8)) &&
2191 (!memcmp(&iucv_sk(sk)->src_user_id,
2192 trans_hdr->destUserID, 8)) &&
2193 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2194 (!memcmp(&iucv_sk(sk)->dst_user_id,
2195 nullstring, 8))) {
2196 iucv = iucv_sk(sk);
2197 break;
2198 }
2199 } else {
2200 if ((!memcmp(&iucv_sk(sk)->src_name,
2201 trans_hdr->destAppName, 8)) &&
2202 (!memcmp(&iucv_sk(sk)->src_user_id,
2203 trans_hdr->destUserID, 8)) &&
2204 (!memcmp(&iucv_sk(sk)->dst_name,
2205 trans_hdr->srcAppName, 8)) &&
2206 (!memcmp(&iucv_sk(sk)->dst_user_id,
2207 trans_hdr->srcUserID, 8))) {
2208 iucv = iucv_sk(sk);
2209 break;
2210 }
2211 }
2212 }
2213 read_unlock(&iucv_sk_list.lock);
2214 if (!iucv)
2215 sk = NULL;
2216
2217 /* no sock
2218 how should we send with no sock
2219 1) send without sock no send rc checking?
2220 2) introduce default sock to handle this cases
2221
2222 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2223 data -> send FIN
2224 SYN|ACK, SYN|FIN, FIN -> no action? */
2225
2226 switch (trans_hdr->flags) {
2227 case AF_IUCV_FLAG_SYN:
2228 /* connect request */
2229 err = afiucv_hs_callback_syn(sk, skb);
2230 break;
2231 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2232 /* connect request confirmed */
2233 err = afiucv_hs_callback_synack(sk, skb);
2234 break;
2235 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2236 /* connect request refused */
2237 err = afiucv_hs_callback_synfin(sk, skb);
2238 break;
2239 case (AF_IUCV_FLAG_FIN):
2240 /* close request */
2241 err = afiucv_hs_callback_fin(sk, skb);
2242 break;
2243 case (AF_IUCV_FLAG_WIN):
2244 err = afiucv_hs_callback_win(sk, skb);
2245 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2246 kfree_skb(skb);
2247 break;
2248 }
2249 /* fall through and receive non-zero length data */
2250 case (AF_IUCV_FLAG_SHT):
2251 /* shutdown request */
2252 /* fall through and receive zero length data */
2253 case 0:
2254 /* plain data frame */
2255 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2256 err = afiucv_hs_callback_rx(sk, skb);
2257 break;
2258 default:
2259 ;
2260 }
2261
2262 return err;
2263 }
2264
2265 /**
2266 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2267 * transport
2268 **/
2269 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2270 enum iucv_tx_notify n)
2271 {
2272 struct sock *isk = skb->sk;
2273 struct sock *sk = NULL;
2274 struct iucv_sock *iucv = NULL;
2275 struct sk_buff_head *list;
2276 struct sk_buff *list_skb;
2277 struct sk_buff *nskb;
2278 unsigned long flags;
2279
2280 read_lock_irqsave(&iucv_sk_list.lock, flags);
2281 sk_for_each(sk, &iucv_sk_list.head)
2282 if (sk == isk) {
2283 iucv = iucv_sk(sk);
2284 break;
2285 }
2286 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2287
2288 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2289 return;
2290
2291 list = &iucv->send_skb_q;
2292 spin_lock_irqsave(&list->lock, flags);
2293 if (skb_queue_empty(list))
2294 goto out_unlock;
2295 list_skb = list->next;
2296 nskb = list_skb->next;
2297 while (list_skb != (struct sk_buff *)list) {
2298 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2299 switch (n) {
2300 case TX_NOTIFY_OK:
2301 __skb_unlink(list_skb, list);
2302 kfree_skb(list_skb);
2303 iucv_sock_wake_msglim(sk);
2304 break;
2305 case TX_NOTIFY_PENDING:
2306 atomic_inc(&iucv->pendings);
2307 break;
2308 case TX_NOTIFY_DELAYED_OK:
2309 __skb_unlink(list_skb, list);
2310 atomic_dec(&iucv->pendings);
2311 if (atomic_read(&iucv->pendings) <= 0)
2312 iucv_sock_wake_msglim(sk);
2313 kfree_skb(list_skb);
2314 break;
2315 case TX_NOTIFY_UNREACHABLE:
2316 case TX_NOTIFY_DELAYED_UNREACHABLE:
2317 case TX_NOTIFY_TPQFULL: /* not yet used */
2318 case TX_NOTIFY_GENERALERROR:
2319 case TX_NOTIFY_DELAYED_GENERALERROR:
2320 __skb_unlink(list_skb, list);
2321 kfree_skb(list_skb);
2322 if (sk->sk_state == IUCV_CONNECTED) {
2323 sk->sk_state = IUCV_DISCONN;
2324 sk->sk_state_change(sk);
2325 }
2326 break;
2327 }
2328 break;
2329 }
2330 list_skb = nskb;
2331 nskb = nskb->next;
2332 }
2333 out_unlock:
2334 spin_unlock_irqrestore(&list->lock, flags);
2335
2336 if (sk->sk_state == IUCV_CLOSING) {
2337 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2338 sk->sk_state = IUCV_CLOSED;
2339 sk->sk_state_change(sk);
2340 }
2341 }
2342
2343 }
2344
2345 /*
2346 * afiucv_netdev_event: handle netdev notifier chain events
2347 */
2348 static int afiucv_netdev_event(struct notifier_block *this,
2349 unsigned long event, void *ptr)
2350 {
2351 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2352 struct sock *sk;
2353 struct iucv_sock *iucv;
2354
2355 switch (event) {
2356 case NETDEV_REBOOT:
2357 case NETDEV_GOING_DOWN:
2358 sk_for_each(sk, &iucv_sk_list.head) {
2359 iucv = iucv_sk(sk);
2360 if ((iucv->hs_dev == event_dev) &&
2361 (sk->sk_state == IUCV_CONNECTED)) {
2362 if (event == NETDEV_GOING_DOWN)
2363 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2364 sk->sk_state = IUCV_DISCONN;
2365 sk->sk_state_change(sk);
2366 }
2367 }
2368 break;
2369 case NETDEV_DOWN:
2370 case NETDEV_UNREGISTER:
2371 default:
2372 break;
2373 }
2374 return NOTIFY_DONE;
2375 }
2376
2377 static struct notifier_block afiucv_netdev_notifier = {
2378 .notifier_call = afiucv_netdev_event,
2379 };
2380
2381 static const struct proto_ops iucv_sock_ops = {
2382 .family = PF_IUCV,
2383 .owner = THIS_MODULE,
2384 .release = iucv_sock_release,
2385 .bind = iucv_sock_bind,
2386 .connect = iucv_sock_connect,
2387 .listen = iucv_sock_listen,
2388 .accept = iucv_sock_accept,
2389 .getname = iucv_sock_getname,
2390 .sendmsg = iucv_sock_sendmsg,
2391 .recvmsg = iucv_sock_recvmsg,
2392 .poll = iucv_sock_poll,
2393 .ioctl = sock_no_ioctl,
2394 .mmap = sock_no_mmap,
2395 .socketpair = sock_no_socketpair,
2396 .shutdown = iucv_sock_shutdown,
2397 .setsockopt = iucv_sock_setsockopt,
2398 .getsockopt = iucv_sock_getsockopt,
2399 };
2400
2401 static const struct net_proto_family iucv_sock_family_ops = {
2402 .family = AF_IUCV,
2403 .owner = THIS_MODULE,
2404 .create = iucv_sock_create,
2405 };
2406
2407 static struct packet_type iucv_packet_type = {
2408 .type = cpu_to_be16(ETH_P_AF_IUCV),
2409 .func = afiucv_hs_rcv,
2410 };
2411
2412 static int afiucv_iucv_init(void)
2413 {
2414 int err;
2415
2416 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2417 if (err)
2418 goto out;
2419 /* establish dummy device */
2420 af_iucv_driver.bus = pr_iucv->bus;
2421 err = driver_register(&af_iucv_driver);
2422 if (err)
2423 goto out_iucv;
2424 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2425 if (!af_iucv_dev) {
2426 err = -ENOMEM;
2427 goto out_driver;
2428 }
2429 dev_set_name(af_iucv_dev, "af_iucv");
2430 af_iucv_dev->bus = pr_iucv->bus;
2431 af_iucv_dev->parent = pr_iucv->root;
2432 af_iucv_dev->release = (void (*)(struct device *))kfree;
2433 af_iucv_dev->driver = &af_iucv_driver;
2434 err = device_register(af_iucv_dev);
2435 if (err)
2436 goto out_driver;
2437 return 0;
2438
2439 out_driver:
2440 driver_unregister(&af_iucv_driver);
2441 out_iucv:
2442 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2443 out:
2444 return err;
2445 }
2446
2447 static int __init afiucv_init(void)
2448 {
2449 int err;
2450
2451 if (MACHINE_IS_VM) {
2452 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2453 if (unlikely(err)) {
2454 WARN_ON(err);
2455 err = -EPROTONOSUPPORT;
2456 goto out;
2457 }
2458
2459 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2460 if (!pr_iucv) {
2461 printk(KERN_WARNING "iucv_if lookup failed\n");
2462 memset(&iucv_userid, 0, sizeof(iucv_userid));
2463 }
2464 } else {
2465 memset(&iucv_userid, 0, sizeof(iucv_userid));
2466 pr_iucv = NULL;
2467 }
2468
2469 err = proto_register(&iucv_proto, 0);
2470 if (err)
2471 goto out;
2472 err = sock_register(&iucv_sock_family_ops);
2473 if (err)
2474 goto out_proto;
2475
2476 if (pr_iucv) {
2477 err = afiucv_iucv_init();
2478 if (err)
2479 goto out_sock;
2480 } else
2481 register_netdevice_notifier(&afiucv_netdev_notifier);
2482 dev_add_pack(&iucv_packet_type);
2483 return 0;
2484
2485 out_sock:
2486 sock_unregister(PF_IUCV);
2487 out_proto:
2488 proto_unregister(&iucv_proto);
2489 out:
2490 if (pr_iucv)
2491 symbol_put(iucv_if);
2492 return err;
2493 }
2494
2495 static void __exit afiucv_exit(void)
2496 {
2497 if (pr_iucv) {
2498 device_unregister(af_iucv_dev);
2499 driver_unregister(&af_iucv_driver);
2500 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2501 symbol_put(iucv_if);
2502 } else
2503 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2504 dev_remove_pack(&iucv_packet_type);
2505 sock_unregister(PF_IUCV);
2506 proto_unregister(&iucv_proto);
2507 }
2508
2509 module_init(afiucv_init);
2510 module_exit(afiucv_exit);
2511
2512 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2513 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2514 MODULE_VERSION(VERSION);
2515 MODULE_LICENSE("GPL");
2516 MODULE_ALIAS_NETPROTO(PF_IUCV);
2517
Michael's Linux tree.