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[cor.git] / net / iucv / af_iucv.c
blobebb62a4ebe30d3bd6347f72711b23655cddc00c5
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IUCV protocol stack for Linux on zSeries
4 *
5 * Copyright IBM Corp. 2006, 2009
6 *
7 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
8 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
9 * PM functions:
10 * Ursula Braun <ursula.braun@de.ibm.com>
11 */
12
13 #define KMSG_COMPONENT "af_iucv"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16 #include <linux/module.h>
17 #include <linux/netdevice.h>
18 #include <linux/types.h>
19 #include <linux/list.h>
20 #include <linux/errno.h>
21 #include <linux/kernel.h>
22 #include <linux/sched/signal.h>
23 #include <linux/slab.h>
24 #include <linux/skbuff.h>
25 #include <linux/init.h>
26 #include <linux/poll.h>
27 #include <linux/security.h>
28 #include <net/sock.h>
29 #include <asm/ebcdic.h>
30 #include <asm/cpcmd.h>
31 #include <linux/kmod.h>
32
33 #include <net/iucv/af_iucv.h>
34
35 #define VERSION "1.2"
36
37 static char iucv_userid[80];
38
39 static const struct proto_ops iucv_sock_ops;
40
41 static struct proto iucv_proto = {
42 .name = "AF_IUCV",
43 .owner = THIS_MODULE,
44 .obj_size = sizeof(struct iucv_sock),
45 };
46
47 static struct iucv_interface *pr_iucv;
48
49 /* special AF_IUCV IPRM messages */
50 static const u8 iprm_shutdown[8] =
51 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
52
53 #define TRGCLS_SIZE FIELD_SIZEOF(struct iucv_message, class)
54
55 #define __iucv_sock_wait(sk, condition, timeo, ret) \
56 do { \
57 DEFINE_WAIT(__wait); \
58 long __timeo = timeo; \
59 ret = 0; \
60 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
61 while (!(condition)) { \
62 if (!__timeo) { \
63 ret = -EAGAIN; \
64 break; \
65 } \
66 if (signal_pending(current)) { \
67 ret = sock_intr_errno(__timeo); \
68 break; \
69 } \
70 release_sock(sk); \
71 __timeo = schedule_timeout(__timeo); \
72 lock_sock(sk); \
73 ret = sock_error(sk); \
74 if (ret) \
75 break; \
76 } \
77 finish_wait(sk_sleep(sk), &__wait); \
78 } while (0)
79
80 #define iucv_sock_wait(sk, condition, timeo) \
81 ({ \
82 int __ret = 0; \
83 if (!(condition)) \
84 __iucv_sock_wait(sk, condition, timeo, __ret); \
85 __ret; \
86 })
87
88 static void iucv_sock_kill(struct sock *sk);
89 static void iucv_sock_close(struct sock *sk);
90 static void iucv_sever_path(struct sock *, int);
91
92 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
93 struct packet_type *pt, struct net_device *orig_dev);
94 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
95 struct sk_buff *skb, u8 flags);
96 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
97
98 /* Call Back functions */
99 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
100 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
101 static void iucv_callback_connack(struct iucv_path *, u8 *);
102 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
103 static void iucv_callback_connrej(struct iucv_path *, u8 *);
104 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
105
106 static struct iucv_sock_list iucv_sk_list = {
107 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
108 .autobind_name = ATOMIC_INIT(0)
109 };
110
111 static struct iucv_handler af_iucv_handler = {
112 .path_pending = iucv_callback_connreq,
113 .path_complete = iucv_callback_connack,
114 .path_severed = iucv_callback_connrej,
115 .message_pending = iucv_callback_rx,
116 .message_complete = iucv_callback_txdone,
117 .path_quiesced = iucv_callback_shutdown,
118 };
119
120 static inline void high_nmcpy(unsigned char *dst, char *src)
121 {
122 memcpy(dst, src, 8);
123 }
124
125 static inline void low_nmcpy(unsigned char *dst, char *src)
126 {
127 memcpy(&dst[8], src, 8);
128 }
129
130 static int afiucv_pm_prepare(struct device *dev)
131 {
132 #ifdef CONFIG_PM_DEBUG
133 printk(KERN_WARNING "afiucv_pm_prepare\n");
134 #endif
135 return 0;
136 }
137
138 static void afiucv_pm_complete(struct device *dev)
139 {
140 #ifdef CONFIG_PM_DEBUG
141 printk(KERN_WARNING "afiucv_pm_complete\n");
142 #endif
143 }
144
145 /**
146 * afiucv_pm_freeze() - Freeze PM callback
147 * @dev: AFIUCV dummy device
148 *
149 * Sever all established IUCV communication pathes
150 */
151 static int afiucv_pm_freeze(struct device *dev)
152 {
153 struct iucv_sock *iucv;
154 struct sock *sk;
155
156 #ifdef CONFIG_PM_DEBUG
157 printk(KERN_WARNING "afiucv_pm_freeze\n");
158 #endif
159 read_lock(&iucv_sk_list.lock);
160 sk_for_each(sk, &iucv_sk_list.head) {
161 iucv = iucv_sk(sk);
162 switch (sk->sk_state) {
163 case IUCV_DISCONN:
164 case IUCV_CLOSING:
165 case IUCV_CONNECTED:
166 iucv_sever_path(sk, 0);
167 break;
168 case IUCV_OPEN:
169 case IUCV_BOUND:
170 case IUCV_LISTEN:
171 case IUCV_CLOSED:
172 default:
173 break;
174 }
175 skb_queue_purge(&iucv->send_skb_q);
176 skb_queue_purge(&iucv->backlog_skb_q);
177 }
178 read_unlock(&iucv_sk_list.lock);
179 return 0;
180 }
181
182 /**
183 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
184 * @dev: AFIUCV dummy device
185 *
186 * socket clean up after freeze
187 */
188 static int afiucv_pm_restore_thaw(struct device *dev)
189 {
190 struct sock *sk;
191
192 #ifdef CONFIG_PM_DEBUG
193 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
194 #endif
195 read_lock(&iucv_sk_list.lock);
196 sk_for_each(sk, &iucv_sk_list.head) {
197 switch (sk->sk_state) {
198 case IUCV_CONNECTED:
199 sk->sk_err = EPIPE;
200 sk->sk_state = IUCV_DISCONN;
201 sk->sk_state_change(sk);
202 break;
203 case IUCV_DISCONN:
204 case IUCV_CLOSING:
205 case IUCV_LISTEN:
206 case IUCV_BOUND:
207 case IUCV_OPEN:
208 default:
209 break;
210 }
211 }
212 read_unlock(&iucv_sk_list.lock);
213 return 0;
214 }
215
216 static const struct dev_pm_ops afiucv_pm_ops = {
217 .prepare = afiucv_pm_prepare,
218 .complete = afiucv_pm_complete,
219 .freeze = afiucv_pm_freeze,
220 .thaw = afiucv_pm_restore_thaw,
221 .restore = afiucv_pm_restore_thaw,
222 };
223
224 static struct device_driver af_iucv_driver = {
225 .owner = THIS_MODULE,
226 .name = "afiucv",
227 .bus = NULL,
228 .pm = &afiucv_pm_ops,
229 };
230
231 /* dummy device used as trigger for PM functions */
232 static struct device *af_iucv_dev;
233
234 /**
235 * iucv_msg_length() - Returns the length of an iucv message.
236 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
237 *
238 * The function returns the length of the specified iucv message @msg of data
239 * stored in a buffer and of data stored in the parameter list (PRMDATA).
240 *
241 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
242 * data:
243 * PRMDATA[0..6] socket data (max 7 bytes);
244 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
245 *
246 * The socket data length is computed by subtracting the socket data length
247 * value from 0xFF.
248 * If the socket data len is greater 7, then PRMDATA can be used for special
249 * notifications (see iucv_sock_shutdown); and further,
250 * if the socket data len is > 7, the function returns 8.
251 *
252 * Use this function to allocate socket buffers to store iucv message data.
253 */
254 static inline size_t iucv_msg_length(struct iucv_message *msg)
255 {
256 size_t datalen;
257
258 if (msg->flags & IUCV_IPRMDATA) {
259 datalen = 0xff - msg->rmmsg[7];
260 return (datalen < 8) ? datalen : 8;
261 }
262 return msg->length;
263 }
264
265 /**
266 * iucv_sock_in_state() - check for specific states
267 * @sk: sock structure
268 * @state: first iucv sk state
269 * @state: second iucv sk state
270 *
271 * Returns true if the socket in either in the first or second state.
272 */
273 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
274 {
275 return (sk->sk_state == state || sk->sk_state == state2);
276 }
277
278 /**
279 * iucv_below_msglim() - function to check if messages can be sent
280 * @sk: sock structure
281 *
282 * Returns true if the send queue length is lower than the message limit.
283 * Always returns true if the socket is not connected (no iucv path for
284 * checking the message limit).
285 */
286 static inline int iucv_below_msglim(struct sock *sk)
287 {
288 struct iucv_sock *iucv = iucv_sk(sk);
289
290 if (sk->sk_state != IUCV_CONNECTED)
291 return 1;
292 if (iucv->transport == AF_IUCV_TRANS_IUCV)
293 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
294 else
295 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
296 (atomic_read(&iucv->pendings) <= 0));
297 }
298
299 /**
300 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
301 */
302 static void iucv_sock_wake_msglim(struct sock *sk)
303 {
304 struct socket_wq *wq;
305
306 rcu_read_lock();
307 wq = rcu_dereference(sk->sk_wq);
308 if (skwq_has_sleeper(wq))
309 wake_up_interruptible_all(&wq->wait);
310 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
311 rcu_read_unlock();
312 }
313
314 /**
315 * afiucv_hs_send() - send a message through HiperSockets transport
316 */
317 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
318 struct sk_buff *skb, u8 flags)
319 {
320 struct iucv_sock *iucv = iucv_sk(sock);
321 struct af_iucv_trans_hdr *phs_hdr;
322 struct sk_buff *nskb;
323 int err, confirm_recv = 0;
324
325 phs_hdr = skb_push(skb, sizeof(*phs_hdr));
326 memset(phs_hdr, 0, sizeof(*phs_hdr));
327 skb_reset_network_header(skb);
328
329 phs_hdr->magic = ETH_P_AF_IUCV;
330 phs_hdr->version = 1;
331 phs_hdr->flags = flags;
332 if (flags == AF_IUCV_FLAG_SYN)
333 phs_hdr->window = iucv->msglimit;
334 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
335 confirm_recv = atomic_read(&iucv->msg_recv);
336 phs_hdr->window = confirm_recv;
337 if (confirm_recv)
338 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
339 }
340 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
341 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
342 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
343 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
344 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
345 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
346 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
347 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
348 if (imsg)
349 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
350
351 skb->dev = iucv->hs_dev;
352 if (!skb->dev) {
353 err = -ENODEV;
354 goto err_free;
355 }
356
357 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
358
359 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
360 err = -ENETDOWN;
361 goto err_free;
362 }
363 if (skb->len > skb->dev->mtu) {
364 if (sock->sk_type == SOCK_SEQPACKET) {
365 err = -EMSGSIZE;
366 goto err_free;
367 }
368 skb_trim(skb, skb->dev->mtu);
369 }
370 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
371
372 __skb_header_release(skb);
373 nskb = skb_clone(skb, GFP_ATOMIC);
374 if (!nskb) {
375 err = -ENOMEM;
376 goto err_free;
377 }
378
379 skb_queue_tail(&iucv->send_skb_q, nskb);
380 err = dev_queue_xmit(skb);
381 if (net_xmit_eval(err)) {
382 skb_unlink(nskb, &iucv->send_skb_q);
383 kfree_skb(nskb);
384 } else {
385 atomic_sub(confirm_recv, &iucv->msg_recv);
386 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
387 }
388 return net_xmit_eval(err);
389
390 err_free:
391 kfree_skb(skb);
392 return err;
393 }
394
395 static struct sock *__iucv_get_sock_by_name(char *nm)
396 {
397 struct sock *sk;
398
399 sk_for_each(sk, &iucv_sk_list.head)
400 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
401 return sk;
402
403 return NULL;
404 }
405
406 static void iucv_sock_destruct(struct sock *sk)
407 {
408 skb_queue_purge(&sk->sk_receive_queue);
409 skb_queue_purge(&sk->sk_error_queue);
410
411 sk_mem_reclaim(sk);
412
413 if (!sock_flag(sk, SOCK_DEAD)) {
414 pr_err("Attempt to release alive iucv socket %p\n", sk);
415 return;
416 }
417
418 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
419 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
420 WARN_ON(sk->sk_wmem_queued);
421 WARN_ON(sk->sk_forward_alloc);
422 }
423
424 /* Cleanup Listen */
425 static void iucv_sock_cleanup_listen(struct sock *parent)
426 {
427 struct sock *sk;
428
429 /* Close non-accepted connections */
430 while ((sk = iucv_accept_dequeue(parent, NULL))) {
431 iucv_sock_close(sk);
432 iucv_sock_kill(sk);
433 }
434
435 parent->sk_state = IUCV_CLOSED;
436 }
437
438 /* Kill socket (only if zapped and orphaned) */
439 static void iucv_sock_kill(struct sock *sk)
440 {
441 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
442 return;
443
444 iucv_sock_unlink(&iucv_sk_list, sk);
445 sock_set_flag(sk, SOCK_DEAD);
446 sock_put(sk);
447 }
448
449 /* Terminate an IUCV path */
450 static void iucv_sever_path(struct sock *sk, int with_user_data)
451 {
452 unsigned char user_data[16];
453 struct iucv_sock *iucv = iucv_sk(sk);
454 struct iucv_path *path = iucv->path;
455
456 if (iucv->path) {
457 iucv->path = NULL;
458 if (with_user_data) {
459 low_nmcpy(user_data, iucv->src_name);
460 high_nmcpy(user_data, iucv->dst_name);
461 ASCEBC(user_data, sizeof(user_data));
462 pr_iucv->path_sever(path, user_data);
463 } else
464 pr_iucv->path_sever(path, NULL);
465 iucv_path_free(path);
466 }
467 }
468
469 /* Send controlling flags through an IUCV socket for HIPER transport */
470 static int iucv_send_ctrl(struct sock *sk, u8 flags)
471 {
472 struct iucv_sock *iucv = iucv_sk(sk);
473 int err = 0;
474 int blen;
475 struct sk_buff *skb;
476 u8 shutdown = 0;
477
478 blen = sizeof(struct af_iucv_trans_hdr) +
479 LL_RESERVED_SPACE(iucv->hs_dev);
480 if (sk->sk_shutdown & SEND_SHUTDOWN) {
481 /* controlling flags should be sent anyway */
482 shutdown = sk->sk_shutdown;
483 sk->sk_shutdown &= RCV_SHUTDOWN;
484 }
485 skb = sock_alloc_send_skb(sk, blen, 1, &err);
486 if (skb) {
487 skb_reserve(skb, blen);
488 err = afiucv_hs_send(NULL, sk, skb, flags);
489 }
490 if (shutdown)
491 sk->sk_shutdown = shutdown;
492 return err;
493 }
494
495 /* Close an IUCV socket */
496 static void iucv_sock_close(struct sock *sk)
497 {
498 struct iucv_sock *iucv = iucv_sk(sk);
499 unsigned long timeo;
500 int err = 0;
501
502 lock_sock(sk);
503
504 switch (sk->sk_state) {
505 case IUCV_LISTEN:
506 iucv_sock_cleanup_listen(sk);
507 break;
508
509 case IUCV_CONNECTED:
510 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
511 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
512 sk->sk_state = IUCV_DISCONN;
513 sk->sk_state_change(sk);
514 }
515 /* fall through */
516
517 case IUCV_DISCONN:
518 sk->sk_state = IUCV_CLOSING;
519 sk->sk_state_change(sk);
520
521 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
522 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
523 timeo = sk->sk_lingertime;
524 else
525 timeo = IUCV_DISCONN_TIMEOUT;
526 iucv_sock_wait(sk,
527 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
528 timeo);
529 }
530 /* fall through */
531
532 case IUCV_CLOSING:
533 sk->sk_state = IUCV_CLOSED;
534 sk->sk_state_change(sk);
535
536 sk->sk_err = ECONNRESET;
537 sk->sk_state_change(sk);
538
539 skb_queue_purge(&iucv->send_skb_q);
540 skb_queue_purge(&iucv->backlog_skb_q);
541 /* fall through */
542
543 default:
544 iucv_sever_path(sk, 1);
545 }
546
547 if (iucv->hs_dev) {
548 dev_put(iucv->hs_dev);
549 iucv->hs_dev = NULL;
550 sk->sk_bound_dev_if = 0;
551 }
552
553 /* mark socket for deletion by iucv_sock_kill() */
554 sock_set_flag(sk, SOCK_ZAPPED);
555
556 release_sock(sk);
557 }
558
559 static void iucv_sock_init(struct sock *sk, struct sock *parent)
560 {
561 if (parent) {
562 sk->sk_type = parent->sk_type;
563 security_sk_clone(parent, sk);
564 }
565 }
566
567 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
568 {
569 struct sock *sk;
570 struct iucv_sock *iucv;
571
572 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
573 if (!sk)
574 return NULL;
575 iucv = iucv_sk(sk);
576
577 sock_init_data(sock, sk);
578 INIT_LIST_HEAD(&iucv->accept_q);
579 spin_lock_init(&iucv->accept_q_lock);
580 skb_queue_head_init(&iucv->send_skb_q);
581 INIT_LIST_HEAD(&iucv->message_q.list);
582 spin_lock_init(&iucv->message_q.lock);
583 skb_queue_head_init(&iucv->backlog_skb_q);
584 iucv->send_tag = 0;
585 atomic_set(&iucv->pendings, 0);
586 iucv->flags = 0;
587 iucv->msglimit = 0;
588 atomic_set(&iucv->msg_sent, 0);
589 atomic_set(&iucv->msg_recv, 0);
590 iucv->path = NULL;
591 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
592 memset(&iucv->src_user_id , 0, 32);
593 if (pr_iucv)
594 iucv->transport = AF_IUCV_TRANS_IUCV;
595 else
596 iucv->transport = AF_IUCV_TRANS_HIPER;
597
598 sk->sk_destruct = iucv_sock_destruct;
599 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
600
601 sock_reset_flag(sk, SOCK_ZAPPED);
602
603 sk->sk_protocol = proto;
604 sk->sk_state = IUCV_OPEN;
605
606 iucv_sock_link(&iucv_sk_list, sk);
607 return sk;
608 }
609
610 /* Create an IUCV socket */
611 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
612 int kern)
613 {
614 struct sock *sk;
615
616 if (protocol && protocol != PF_IUCV)
617 return -EPROTONOSUPPORT;
618
619 sock->state = SS_UNCONNECTED;
620
621 switch (sock->type) {
622 case SOCK_STREAM:
623 sock->ops = &iucv_sock_ops;
624 break;
625 case SOCK_SEQPACKET:
626 /* currently, proto ops can handle both sk types */
627 sock->ops = &iucv_sock_ops;
628 break;
629 default:
630 return -ESOCKTNOSUPPORT;
631 }
632
633 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
634 if (!sk)
635 return -ENOMEM;
636
637 iucv_sock_init(sk, NULL);
638
639 return 0;
640 }
641
642 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
643 {
644 write_lock_bh(&l->lock);
645 sk_add_node(sk, &l->head);
646 write_unlock_bh(&l->lock);
647 }
648
649 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
650 {
651 write_lock_bh(&l->lock);
652 sk_del_node_init(sk);
653 write_unlock_bh(&l->lock);
654 }
655
656 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
657 {
658 unsigned long flags;
659 struct iucv_sock *par = iucv_sk(parent);
660
661 sock_hold(sk);
662 spin_lock_irqsave(&par->accept_q_lock, flags);
663 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
664 spin_unlock_irqrestore(&par->accept_q_lock, flags);
665 iucv_sk(sk)->parent = parent;
666 sk_acceptq_added(parent);
667 }
668
669 void iucv_accept_unlink(struct sock *sk)
670 {
671 unsigned long flags;
672 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
673
674 spin_lock_irqsave(&par->accept_q_lock, flags);
675 list_del_init(&iucv_sk(sk)->accept_q);
676 spin_unlock_irqrestore(&par->accept_q_lock, flags);
677 sk_acceptq_removed(iucv_sk(sk)->parent);
678 iucv_sk(sk)->parent = NULL;
679 sock_put(sk);
680 }
681
682 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
683 {
684 struct iucv_sock *isk, *n;
685 struct sock *sk;
686
687 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
688 sk = (struct sock *) isk;
689 lock_sock(sk);
690
691 if (sk->sk_state == IUCV_CLOSED) {
692 iucv_accept_unlink(sk);
693 release_sock(sk);
694 continue;
695 }
696
697 if (sk->sk_state == IUCV_CONNECTED ||
698 sk->sk_state == IUCV_DISCONN ||
699 !newsock) {
700 iucv_accept_unlink(sk);
701 if (newsock)
702 sock_graft(sk, newsock);
703
704 release_sock(sk);
705 return sk;
706 }
707
708 release_sock(sk);
709 }
710 return NULL;
711 }
712
713 static void __iucv_auto_name(struct iucv_sock *iucv)
714 {
715 char name[12];
716
717 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
718 while (__iucv_get_sock_by_name(name)) {
719 sprintf(name, "%08x",
720 atomic_inc_return(&iucv_sk_list.autobind_name));
721 }
722 memcpy(iucv->src_name, name, 8);
723 }
724
725 /* Bind an unbound socket */
726 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
727 int addr_len)
728 {
729 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
730 struct sock *sk = sock->sk;
731 struct iucv_sock *iucv;
732 int err = 0;
733 struct net_device *dev;
734 char uid[9];
735
736 /* Verify the input sockaddr */
737 if (addr_len < sizeof(struct sockaddr_iucv) ||
738 addr->sa_family != AF_IUCV)
739 return -EINVAL;
740
741 lock_sock(sk);
742 if (sk->sk_state != IUCV_OPEN) {
743 err = -EBADFD;
744 goto done;
745 }
746
747 write_lock_bh(&iucv_sk_list.lock);
748
749 iucv = iucv_sk(sk);
750 if (__iucv_get_sock_by_name(sa->siucv_name)) {
751 err = -EADDRINUSE;
752 goto done_unlock;
753 }
754 if (iucv->path)
755 goto done_unlock;
756
757 /* Bind the socket */
758 if (pr_iucv)
759 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
760 goto vm_bind; /* VM IUCV transport */
761
762 /* try hiper transport */
763 memcpy(uid, sa->siucv_user_id, sizeof(uid));
764 ASCEBC(uid, 8);
765 rcu_read_lock();
766 for_each_netdev_rcu(&init_net, dev) {
767 if (!memcmp(dev->perm_addr, uid, 8)) {
768 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
769 /* Check for unitialized siucv_name */
770 if (strncmp(sa->siucv_name, " ", 8) == 0)
771 __iucv_auto_name(iucv);
772 else
773 memcpy(iucv->src_name, sa->siucv_name, 8);
774 sk->sk_bound_dev_if = dev->ifindex;
775 iucv->hs_dev = dev;
776 dev_hold(dev);
777 sk->sk_state = IUCV_BOUND;
778 iucv->transport = AF_IUCV_TRANS_HIPER;
779 if (!iucv->msglimit)
780 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
781 rcu_read_unlock();
782 goto done_unlock;
783 }
784 }
785 rcu_read_unlock();
786 vm_bind:
787 if (pr_iucv) {
788 /* use local userid for backward compat */
789 memcpy(iucv->src_name, sa->siucv_name, 8);
790 memcpy(iucv->src_user_id, iucv_userid, 8);
791 sk->sk_state = IUCV_BOUND;
792 iucv->transport = AF_IUCV_TRANS_IUCV;
793 sk->sk_allocation |= GFP_DMA;
794 if (!iucv->msglimit)
795 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
796 goto done_unlock;
797 }
798 /* found no dev to bind */
799 err = -ENODEV;
800 done_unlock:
801 /* Release the socket list lock */
802 write_unlock_bh(&iucv_sk_list.lock);
803 done:
804 release_sock(sk);
805 return err;
806 }
807
808 /* Automatically bind an unbound socket */
809 static int iucv_sock_autobind(struct sock *sk)
810 {
811 struct iucv_sock *iucv = iucv_sk(sk);
812 int err = 0;
813
814 if (unlikely(!pr_iucv))
815 return -EPROTO;
816
817 memcpy(iucv->src_user_id, iucv_userid, 8);
818 iucv->transport = AF_IUCV_TRANS_IUCV;
819 sk->sk_allocation |= GFP_DMA;
820
821 write_lock_bh(&iucv_sk_list.lock);
822 __iucv_auto_name(iucv);
823 write_unlock_bh(&iucv_sk_list.lock);
824
825 if (!iucv->msglimit)
826 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
827
828 return err;
829 }
830
831 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
832 {
833 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
834 struct sock *sk = sock->sk;
835 struct iucv_sock *iucv = iucv_sk(sk);
836 unsigned char user_data[16];
837 int err;
838
839 high_nmcpy(user_data, sa->siucv_name);
840 low_nmcpy(user_data, iucv->src_name);
841 ASCEBC(user_data, sizeof(user_data));
842
843 /* Create path. */
844 iucv->path = iucv_path_alloc(iucv->msglimit,
845 IUCV_IPRMDATA, GFP_KERNEL);
846 if (!iucv->path) {
847 err = -ENOMEM;
848 goto done;
849 }
850 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
851 sa->siucv_user_id, NULL, user_data,
852 sk);
853 if (err) {
854 iucv_path_free(iucv->path);
855 iucv->path = NULL;
856 switch (err) {
857 case 0x0b: /* Target communicator is not logged on */
858 err = -ENETUNREACH;
859 break;
860 case 0x0d: /* Max connections for this guest exceeded */
861 case 0x0e: /* Max connections for target guest exceeded */
862 err = -EAGAIN;
863 break;
864 case 0x0f: /* Missing IUCV authorization */
865 err = -EACCES;
866 break;
867 default:
868 err = -ECONNREFUSED;
869 break;
870 }
871 }
872 done:
873 return err;
874 }
875
876 /* Connect an unconnected socket */
877 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
878 int alen, int flags)
879 {
880 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
881 struct sock *sk = sock->sk;
882 struct iucv_sock *iucv = iucv_sk(sk);
883 int err;
884
885 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
886 return -EINVAL;
887
888 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
889 return -EBADFD;
890
891 if (sk->sk_state == IUCV_OPEN &&
892 iucv->transport == AF_IUCV_TRANS_HIPER)
893 return -EBADFD; /* explicit bind required */
894
895 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
896 return -EINVAL;
897
898 if (sk->sk_state == IUCV_OPEN) {
899 err = iucv_sock_autobind(sk);
900 if (unlikely(err))
901 return err;
902 }
903
904 lock_sock(sk);
905
906 /* Set the destination information */
907 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
908 memcpy(iucv->dst_name, sa->siucv_name, 8);
909
910 if (iucv->transport == AF_IUCV_TRANS_HIPER)
911 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
912 else
913 err = afiucv_path_connect(sock, addr);
914 if (err)
915 goto done;
916
917 if (sk->sk_state != IUCV_CONNECTED)
918 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
919 IUCV_DISCONN),
920 sock_sndtimeo(sk, flags & O_NONBLOCK));
921
922 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
923 err = -ECONNREFUSED;
924
925 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
926 iucv_sever_path(sk, 0);
927
928 done:
929 release_sock(sk);
930 return err;
931 }
932
933 /* Move a socket into listening state. */
934 static int iucv_sock_listen(struct socket *sock, int backlog)
935 {
936 struct sock *sk = sock->sk;
937 int err;
938
939 lock_sock(sk);
940
941 err = -EINVAL;
942 if (sk->sk_state != IUCV_BOUND)
943 goto done;
944
945 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
946 goto done;
947
948 sk->sk_max_ack_backlog = backlog;
949 sk->sk_ack_backlog = 0;
950 sk->sk_state = IUCV_LISTEN;
951 err = 0;
952
953 done:
954 release_sock(sk);
955 return err;
956 }
957
958 /* Accept a pending connection */
959 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
960 int flags, bool kern)
961 {
962 DECLARE_WAITQUEUE(wait, current);
963 struct sock *sk = sock->sk, *nsk;
964 long timeo;
965 int err = 0;
966
967 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
968
969 if (sk->sk_state != IUCV_LISTEN) {
970 err = -EBADFD;
971 goto done;
972 }
973
974 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
975
976 /* Wait for an incoming connection */
977 add_wait_queue_exclusive(sk_sleep(sk), &wait);
978 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
979 set_current_state(TASK_INTERRUPTIBLE);
980 if (!timeo) {
981 err = -EAGAIN;
982 break;
983 }
984
985 release_sock(sk);
986 timeo = schedule_timeout(timeo);
987 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
988
989 if (sk->sk_state != IUCV_LISTEN) {
990 err = -EBADFD;
991 break;
992 }
993
994 if (signal_pending(current)) {
995 err = sock_intr_errno(timeo);
996 break;
997 }
998 }
999
1000 set_current_state(TASK_RUNNING);
1001 remove_wait_queue(sk_sleep(sk), &wait);
1002
1003 if (err)
1004 goto done;
1005
1006 newsock->state = SS_CONNECTED;
1007
1008 done:
1009 release_sock(sk);
1010 return err;
1011 }
1012
1013 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
1014 int peer)
1015 {
1016 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
1017 struct sock *sk = sock->sk;
1018 struct iucv_sock *iucv = iucv_sk(sk);
1019
1020 addr->sa_family = AF_IUCV;
1021
1022 if (peer) {
1023 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1024 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1025 } else {
1026 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1027 memcpy(siucv->siucv_name, iucv->src_name, 8);
1028 }
1029 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1030 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1031 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1032
1033 return sizeof(struct sockaddr_iucv);
1034 }
1035
1036 /**
1037 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1038 * @path: IUCV path
1039 * @msg: Pointer to a struct iucv_message
1040 * @skb: The socket data to send, skb->len MUST BE <= 7
1041 *
1042 * Send the socket data in the parameter list in the iucv message
1043 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1044 * list and the socket data len at index 7 (last byte).
1045 * See also iucv_msg_length().
1046 *
1047 * Returns the error code from the iucv_message_send() call.
1048 */
1049 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1050 struct sk_buff *skb)
1051 {
1052 u8 prmdata[8];
1053
1054 memcpy(prmdata, (void *) skb->data, skb->len);
1055 prmdata[7] = 0xff - (u8) skb->len;
1056 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1057 (void *) prmdata, 8);
1058 }
1059
1060 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1061 size_t len)
1062 {
1063 struct sock *sk = sock->sk;
1064 struct iucv_sock *iucv = iucv_sk(sk);
1065 size_t headroom = 0;
1066 size_t linear;
1067 struct sk_buff *skb;
1068 struct iucv_message txmsg = {0};
1069 struct cmsghdr *cmsg;
1070 int cmsg_done;
1071 long timeo;
1072 char user_id[9];
1073 char appl_id[9];
1074 int err;
1075 int noblock = msg->msg_flags & MSG_DONTWAIT;
1076
1077 err = sock_error(sk);
1078 if (err)
1079 return err;
1080
1081 if (msg->msg_flags & MSG_OOB)
1082 return -EOPNOTSUPP;
1083
1084 /* SOCK_SEQPACKET: we do not support segmented records */
1085 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1086 return -EOPNOTSUPP;
1087
1088 lock_sock(sk);
1089
1090 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1091 err = -EPIPE;
1092 goto out;
1093 }
1094
1095 /* Return if the socket is not in connected state */
1096 if (sk->sk_state != IUCV_CONNECTED) {
1097 err = -ENOTCONN;
1098 goto out;
1099 }
1100
1101 /* initialize defaults */
1102 cmsg_done = 0; /* check for duplicate headers */
1103 txmsg.class = 0;
1104
1105 /* iterate over control messages */
1106 for_each_cmsghdr(cmsg, msg) {
1107 if (!CMSG_OK(msg, cmsg)) {
1108 err = -EINVAL;
1109 goto out;
1110 }
1111
1112 if (cmsg->cmsg_level != SOL_IUCV)
1113 continue;
1114
1115 if (cmsg->cmsg_type & cmsg_done) {
1116 err = -EINVAL;
1117 goto out;
1118 }
1119 cmsg_done |= cmsg->cmsg_type;
1120
1121 switch (cmsg->cmsg_type) {
1122 case SCM_IUCV_TRGCLS:
1123 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1124 err = -EINVAL;
1125 goto out;
1126 }
1127
1128 /* set iucv message target class */
1129 memcpy(&txmsg.class,
1130 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1131
1132 break;
1133
1134 default:
1135 err = -EINVAL;
1136 goto out;
1137 }
1138 }
1139
1140 /* allocate one skb for each iucv message:
1141 * this is fine for SOCK_SEQPACKET (unless we want to support
1142 * segmented records using the MSG_EOR flag), but
1143 * for SOCK_STREAM we might want to improve it in future */
1144 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1145 headroom = sizeof(struct af_iucv_trans_hdr) +
1146 LL_RESERVED_SPACE(iucv->hs_dev);
1147 linear = len;
1148 } else {
1149 if (len < PAGE_SIZE) {
1150 linear = len;
1151 } else {
1152 /* In nonlinear "classic" iucv skb,
1153 * reserve space for iucv_array
1154 */
1155 headroom = sizeof(struct iucv_array) *
1156 (MAX_SKB_FRAGS + 1);
1157 linear = PAGE_SIZE - headroom;
1158 }
1159 }
1160 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1161 noblock, &err, 0);
1162 if (!skb)
1163 goto out;
1164 if (headroom)
1165 skb_reserve(skb, headroom);
1166 skb_put(skb, linear);
1167 skb->len = len;
1168 skb->data_len = len - linear;
1169 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1170 if (err)
1171 goto fail;
1172
1173 /* wait if outstanding messages for iucv path has reached */
1174 timeo = sock_sndtimeo(sk, noblock);
1175 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1176 if (err)
1177 goto fail;
1178
1179 /* return -ECONNRESET if the socket is no longer connected */
1180 if (sk->sk_state != IUCV_CONNECTED) {
1181 err = -ECONNRESET;
1182 goto fail;
1183 }
1184
1185 /* increment and save iucv message tag for msg_completion cbk */
1186 txmsg.tag = iucv->send_tag++;
1187 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1188
1189 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1190 atomic_inc(&iucv->msg_sent);
1191 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1192 if (err) {
1193 atomic_dec(&iucv->msg_sent);
1194 goto out;
1195 }
1196 } else { /* Classic VM IUCV transport */
1197 skb_queue_tail(&iucv->send_skb_q, skb);
1198
1199 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1200 skb->len <= 7) {
1201 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1202
1203 /* on success: there is no message_complete callback */
1204 /* for an IPRMDATA msg; remove skb from send queue */
1205 if (err == 0) {
1206 skb_unlink(skb, &iucv->send_skb_q);
1207 kfree_skb(skb);
1208 }
1209
1210 /* this error should never happen since the */
1211 /* IUCV_IPRMDATA path flag is set... sever path */
1212 if (err == 0x15) {
1213 pr_iucv->path_sever(iucv->path, NULL);
1214 skb_unlink(skb, &iucv->send_skb_q);
1215 err = -EPIPE;
1216 goto fail;
1217 }
1218 } else if (skb_is_nonlinear(skb)) {
1219 struct iucv_array *iba = (struct iucv_array *)skb->head;
1220 int i;
1221
1222 /* skip iucv_array lying in the headroom */
1223 iba[0].address = (u32)(addr_t)skb->data;
1224 iba[0].length = (u32)skb_headlen(skb);
1225 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1226 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1227
1228 iba[i + 1].address =
1229 (u32)(addr_t)skb_frag_address(frag);
1230 iba[i + 1].length = (u32)skb_frag_size(frag);
1231 }
1232 err = pr_iucv->message_send(iucv->path, &txmsg,
1233 IUCV_IPBUFLST, 0,
1234 (void *)iba, skb->len);
1235 } else { /* non-IPRM Linear skb */
1236 err = pr_iucv->message_send(iucv->path, &txmsg,
1237 0, 0, (void *)skb->data, skb->len);
1238 }
1239 if (err) {
1240 if (err == 3) {
1241 user_id[8] = 0;
1242 memcpy(user_id, iucv->dst_user_id, 8);
1243 appl_id[8] = 0;
1244 memcpy(appl_id, iucv->dst_name, 8);
1245 pr_err(
1246 "Application %s on z/VM guest %s exceeds message limit\n",
1247 appl_id, user_id);
1248 err = -EAGAIN;
1249 } else {
1250 err = -EPIPE;
1251 }
1252 skb_unlink(skb, &iucv->send_skb_q);
1253 goto fail;
1254 }
1255 }
1256
1257 release_sock(sk);
1258 return len;
1259
1260 fail:
1261 kfree_skb(skb);
1262 out:
1263 release_sock(sk);
1264 return err;
1265 }
1266
1267 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1268 {
1269 size_t headroom, linear;
1270 struct sk_buff *skb;
1271 int err;
1272
1273 if (len < PAGE_SIZE) {
1274 headroom = 0;
1275 linear = len;
1276 } else {
1277 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1278 linear = PAGE_SIZE - headroom;
1279 }
1280 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1281 0, &err, GFP_ATOMIC | GFP_DMA);
1282 WARN_ONCE(!skb,
1283 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1284 len, err);
1285 if (skb) {
1286 if (headroom)
1287 skb_reserve(skb, headroom);
1288 skb_put(skb, linear);
1289 skb->len = len;
1290 skb->data_len = len - linear;
1291 }
1292 return skb;
1293 }
1294
1295 /* iucv_process_message() - Receive a single outstanding IUCV message
1296 *
1297 * Locking: must be called with message_q.lock held
1298 */
1299 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1300 struct iucv_path *path,
1301 struct iucv_message *msg)
1302 {
1303 int rc;
1304 unsigned int len;
1305
1306 len = iucv_msg_length(msg);
1307
1308 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1309 /* Note: the first 4 bytes are reserved for msg tag */
1310 IUCV_SKB_CB(skb)->class = msg->class;
1311
1312 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1313 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1314 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1315 skb->data = NULL;
1316 skb->len = 0;
1317 }
1318 } else {
1319 if (skb_is_nonlinear(skb)) {
1320 struct iucv_array *iba = (struct iucv_array *)skb->head;
1321 int i;
1322
1323 iba[0].address = (u32)(addr_t)skb->data;
1324 iba[0].length = (u32)skb_headlen(skb);
1325 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1326 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1327
1328 iba[i + 1].address =
1329 (u32)(addr_t)skb_frag_address(frag);
1330 iba[i + 1].length = (u32)skb_frag_size(frag);
1331 }
1332 rc = pr_iucv->message_receive(path, msg,
1333 IUCV_IPBUFLST,
1334 (void *)iba, len, NULL);
1335 } else {
1336 rc = pr_iucv->message_receive(path, msg,
1337 msg->flags & IUCV_IPRMDATA,
1338 skb->data, len, NULL);
1339 }
1340 if (rc) {
1341 kfree_skb(skb);
1342 return;
1343 }
1344 WARN_ON_ONCE(skb->len != len);
1345 }
1346
1347 IUCV_SKB_CB(skb)->offset = 0;
1348 if (sk_filter(sk, skb)) {
1349 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1350 kfree_skb(skb);
1351 return;
1352 }
1353 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1354 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1355 }
1356
1357 /* iucv_process_message_q() - Process outstanding IUCV messages
1358 *
1359 * Locking: must be called with message_q.lock held
1360 */
1361 static void iucv_process_message_q(struct sock *sk)
1362 {
1363 struct iucv_sock *iucv = iucv_sk(sk);
1364 struct sk_buff *skb;
1365 struct sock_msg_q *p, *n;
1366
1367 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1368 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1369 if (!skb)
1370 break;
1371 iucv_process_message(sk, skb, p->path, &p->msg);
1372 list_del(&p->list);
1373 kfree(p);
1374 if (!skb_queue_empty(&iucv->backlog_skb_q))
1375 break;
1376 }
1377 }
1378
1379 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1380 size_t len, int flags)
1381 {
1382 int noblock = flags & MSG_DONTWAIT;
1383 struct sock *sk = sock->sk;
1384 struct iucv_sock *iucv = iucv_sk(sk);
1385 unsigned int copied, rlen;
1386 struct sk_buff *skb, *rskb, *cskb;
1387 int err = 0;
1388 u32 offset;
1389
1390 if ((sk->sk_state == IUCV_DISCONN) &&
1391 skb_queue_empty(&iucv->backlog_skb_q) &&
1392 skb_queue_empty(&sk->sk_receive_queue) &&
1393 list_empty(&iucv->message_q.list))
1394 return 0;
1395
1396 if (flags & (MSG_OOB))
1397 return -EOPNOTSUPP;
1398
1399 /* receive/dequeue next skb:
1400 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1401 skb = skb_recv_datagram(sk, flags, noblock, &err);
1402 if (!skb) {
1403 if (sk->sk_shutdown & RCV_SHUTDOWN)
1404 return 0;
1405 return err;
1406 }
1407
1408 offset = IUCV_SKB_CB(skb)->offset;
1409 rlen = skb->len - offset; /* real length of skb */
1410 copied = min_t(unsigned int, rlen, len);
1411 if (!rlen)
1412 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1413
1414 cskb = skb;
1415 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1416 if (!(flags & MSG_PEEK))
1417 skb_queue_head(&sk->sk_receive_queue, skb);
1418 return -EFAULT;
1419 }
1420
1421 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1422 if (sk->sk_type == SOCK_SEQPACKET) {
1423 if (copied < rlen)
1424 msg->msg_flags |= MSG_TRUNC;
1425 /* each iucv message contains a complete record */
1426 msg->msg_flags |= MSG_EOR;
1427 }
1428
1429 /* create control message to store iucv msg target class:
1430 * get the trgcls from the control buffer of the skb due to
1431 * fragmentation of original iucv message. */
1432 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1433 sizeof(IUCV_SKB_CB(skb)->class),
1434 (void *)&IUCV_SKB_CB(skb)->class);
1435 if (err) {
1436 if (!(flags & MSG_PEEK))
1437 skb_queue_head(&sk->sk_receive_queue, skb);
1438 return err;
1439 }
1440
1441 /* Mark read part of skb as used */
1442 if (!(flags & MSG_PEEK)) {
1443
1444 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1445 if (sk->sk_type == SOCK_STREAM) {
1446 if (copied < rlen) {
1447 IUCV_SKB_CB(skb)->offset = offset + copied;
1448 skb_queue_head(&sk->sk_receive_queue, skb);
1449 goto done;
1450 }
1451 }
1452
1453 kfree_skb(skb);
1454 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1455 atomic_inc(&iucv->msg_recv);
1456 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1457 WARN_ON(1);
1458 iucv_sock_close(sk);
1459 return -EFAULT;
1460 }
1461 }
1462
1463 /* Queue backlog skbs */
1464 spin_lock_bh(&iucv->message_q.lock);
1465 rskb = skb_dequeue(&iucv->backlog_skb_q);
1466 while (rskb) {
1467 IUCV_SKB_CB(rskb)->offset = 0;
1468 if (__sock_queue_rcv_skb(sk, rskb)) {
1469 /* handle rcv queue full */
1470 skb_queue_head(&iucv->backlog_skb_q,
1471 rskb);
1472 break;
1473 }
1474 rskb = skb_dequeue(&iucv->backlog_skb_q);
1475 }
1476 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1477 if (!list_empty(&iucv->message_q.list))
1478 iucv_process_message_q(sk);
1479 if (atomic_read(&iucv->msg_recv) >=
1480 iucv->msglimit / 2) {
1481 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1482 if (err) {
1483 sk->sk_state = IUCV_DISCONN;
1484 sk->sk_state_change(sk);
1485 }
1486 }
1487 }
1488 spin_unlock_bh(&iucv->message_q.lock);
1489 }
1490
1491 done:
1492 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1493 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1494 copied = rlen;
1495
1496 return copied;
1497 }
1498
1499 static inline __poll_t iucv_accept_poll(struct sock *parent)
1500 {
1501 struct iucv_sock *isk, *n;
1502 struct sock *sk;
1503
1504 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1505 sk = (struct sock *) isk;
1506
1507 if (sk->sk_state == IUCV_CONNECTED)
1508 return EPOLLIN | EPOLLRDNORM;
1509 }
1510
1511 return 0;
1512 }
1513
1514 __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1515 poll_table *wait)
1516 {
1517 struct sock *sk = sock->sk;
1518 __poll_t mask = 0;
1519
1520 sock_poll_wait(file, sock, wait);
1521
1522 if (sk->sk_state == IUCV_LISTEN)
1523 return iucv_accept_poll(sk);
1524
1525 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1526 mask |= EPOLLERR |
1527 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1528
1529 if (sk->sk_shutdown & RCV_SHUTDOWN)
1530 mask |= EPOLLRDHUP;
1531
1532 if (sk->sk_shutdown == SHUTDOWN_MASK)
1533 mask |= EPOLLHUP;
1534
1535 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1536 (sk->sk_shutdown & RCV_SHUTDOWN))
1537 mask |= EPOLLIN | EPOLLRDNORM;
1538
1539 if (sk->sk_state == IUCV_CLOSED)
1540 mask |= EPOLLHUP;
1541
1542 if (sk->sk_state == IUCV_DISCONN)
1543 mask |= EPOLLIN;
1544
1545 if (sock_writeable(sk) && iucv_below_msglim(sk))
1546 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1547 else
1548 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1549
1550 return mask;
1551 }
1552
1553 static int iucv_sock_shutdown(struct socket *sock, int how)
1554 {
1555 struct sock *sk = sock->sk;
1556 struct iucv_sock *iucv = iucv_sk(sk);
1557 struct iucv_message txmsg;
1558 int err = 0;
1559
1560 how++;
1561
1562 if ((how & ~SHUTDOWN_MASK) || !how)
1563 return -EINVAL;
1564
1565 lock_sock(sk);
1566 switch (sk->sk_state) {
1567 case IUCV_LISTEN:
1568 case IUCV_DISCONN:
1569 case IUCV_CLOSING:
1570 case IUCV_CLOSED:
1571 err = -ENOTCONN;
1572 goto fail;
1573 default:
1574 break;
1575 }
1576
1577 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1578 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1579 txmsg.class = 0;
1580 txmsg.tag = 0;
1581 err = pr_iucv->message_send(iucv->path, &txmsg,
1582 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1583 if (err) {
1584 switch (err) {
1585 case 1:
1586 err = -ENOTCONN;
1587 break;
1588 case 2:
1589 err = -ECONNRESET;
1590 break;
1591 default:
1592 err = -ENOTCONN;
1593 break;
1594 }
1595 }
1596 } else
1597 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1598 }
1599
1600 sk->sk_shutdown |= how;
1601 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1602 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1603 iucv->path) {
1604 err = pr_iucv->path_quiesce(iucv->path, NULL);
1605 if (err)
1606 err = -ENOTCONN;
1607 /* skb_queue_purge(&sk->sk_receive_queue); */
1608 }
1609 skb_queue_purge(&sk->sk_receive_queue);
1610 }
1611
1612 /* Wake up anyone sleeping in poll */
1613 sk->sk_state_change(sk);
1614
1615 fail:
1616 release_sock(sk);
1617 return err;
1618 }
1619
1620 static int iucv_sock_release(struct socket *sock)
1621 {
1622 struct sock *sk = sock->sk;
1623 int err = 0;
1624
1625 if (!sk)
1626 return 0;
1627
1628 iucv_sock_close(sk);
1629
1630 sock_orphan(sk);
1631 iucv_sock_kill(sk);
1632 return err;
1633 }
1634
1635 /* getsockopt and setsockopt */
1636 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1637 char __user *optval, unsigned int optlen)
1638 {
1639 struct sock *sk = sock->sk;
1640 struct iucv_sock *iucv = iucv_sk(sk);
1641 int val;
1642 int rc;
1643
1644 if (level != SOL_IUCV)
1645 return -ENOPROTOOPT;
1646
1647 if (optlen < sizeof(int))
1648 return -EINVAL;
1649
1650 if (get_user(val, (int __user *) optval))
1651 return -EFAULT;
1652
1653 rc = 0;
1654
1655 lock_sock(sk);
1656 switch (optname) {
1657 case SO_IPRMDATA_MSG:
1658 if (val)
1659 iucv->flags |= IUCV_IPRMDATA;
1660 else
1661 iucv->flags &= ~IUCV_IPRMDATA;
1662 break;
1663 case SO_MSGLIMIT:
1664 switch (sk->sk_state) {
1665 case IUCV_OPEN:
1666 case IUCV_BOUND:
1667 if (val < 1 || val > (u16)(~0))
1668 rc = -EINVAL;
1669 else
1670 iucv->msglimit = val;
1671 break;
1672 default:
1673 rc = -EINVAL;
1674 break;
1675 }
1676 break;
1677 default:
1678 rc = -ENOPROTOOPT;
1679 break;
1680 }
1681 release_sock(sk);
1682
1683 return rc;
1684 }
1685
1686 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1687 char __user *optval, int __user *optlen)
1688 {
1689 struct sock *sk = sock->sk;
1690 struct iucv_sock *iucv = iucv_sk(sk);
1691 unsigned int val;
1692 int len;
1693
1694 if (level != SOL_IUCV)
1695 return -ENOPROTOOPT;
1696
1697 if (get_user(len, optlen))
1698 return -EFAULT;
1699
1700 if (len < 0)
1701 return -EINVAL;
1702
1703 len = min_t(unsigned int, len, sizeof(int));
1704
1705 switch (optname) {
1706 case SO_IPRMDATA_MSG:
1707 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1708 break;
1709 case SO_MSGLIMIT:
1710 lock_sock(sk);
1711 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1712 : iucv->msglimit; /* default */
1713 release_sock(sk);
1714 break;
1715 case SO_MSGSIZE:
1716 if (sk->sk_state == IUCV_OPEN)
1717 return -EBADFD;
1718 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1719 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1720 0x7fffffff;
1721 break;
1722 default:
1723 return -ENOPROTOOPT;
1724 }
1725
1726 if (put_user(len, optlen))
1727 return -EFAULT;
1728 if (copy_to_user(optval, &val, len))
1729 return -EFAULT;
1730
1731 return 0;
1732 }
1733
1734
1735 /* Callback wrappers - called from iucv base support */
1736 static int iucv_callback_connreq(struct iucv_path *path,
1737 u8 ipvmid[8], u8 ipuser[16])
1738 {
1739 unsigned char user_data[16];
1740 unsigned char nuser_data[16];
1741 unsigned char src_name[8];
1742 struct sock *sk, *nsk;
1743 struct iucv_sock *iucv, *niucv;
1744 int err;
1745
1746 memcpy(src_name, ipuser, 8);
1747 EBCASC(src_name, 8);
1748 /* Find out if this path belongs to af_iucv. */
1749 read_lock(&iucv_sk_list.lock);
1750 iucv = NULL;
1751 sk = NULL;
1752 sk_for_each(sk, &iucv_sk_list.head)
1753 if (sk->sk_state == IUCV_LISTEN &&
1754 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1755 /*
1756 * Found a listening socket with
1757 * src_name == ipuser[0-7].
1758 */
1759 iucv = iucv_sk(sk);
1760 break;
1761 }
1762 read_unlock(&iucv_sk_list.lock);
1763 if (!iucv)
1764 /* No socket found, not one of our paths. */
1765 return -EINVAL;
1766
1767 bh_lock_sock(sk);
1768
1769 /* Check if parent socket is listening */
1770 low_nmcpy(user_data, iucv->src_name);
1771 high_nmcpy(user_data, iucv->dst_name);
1772 ASCEBC(user_data, sizeof(user_data));
1773 if (sk->sk_state != IUCV_LISTEN) {
1774 err = pr_iucv->path_sever(path, user_data);
1775 iucv_path_free(path);
1776 goto fail;
1777 }
1778
1779 /* Check for backlog size */
1780 if (sk_acceptq_is_full(sk)) {
1781 err = pr_iucv->path_sever(path, user_data);
1782 iucv_path_free(path);
1783 goto fail;
1784 }
1785
1786 /* Create the new socket */
1787 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1788 if (!nsk) {
1789 err = pr_iucv->path_sever(path, user_data);
1790 iucv_path_free(path);
1791 goto fail;
1792 }
1793
1794 niucv = iucv_sk(nsk);
1795 iucv_sock_init(nsk, sk);
1796 niucv->transport = AF_IUCV_TRANS_IUCV;
1797 nsk->sk_allocation |= GFP_DMA;
1798
1799 /* Set the new iucv_sock */
1800 memcpy(niucv->dst_name, ipuser + 8, 8);
1801 EBCASC(niucv->dst_name, 8);
1802 memcpy(niucv->dst_user_id, ipvmid, 8);
1803 memcpy(niucv->src_name, iucv->src_name, 8);
1804 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1805 niucv->path = path;
1806
1807 /* Call iucv_accept */
1808 high_nmcpy(nuser_data, ipuser + 8);
1809 memcpy(nuser_data + 8, niucv->src_name, 8);
1810 ASCEBC(nuser_data + 8, 8);
1811
1812 /* set message limit for path based on msglimit of accepting socket */
1813 niucv->msglimit = iucv->msglimit;
1814 path->msglim = iucv->msglimit;
1815 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1816 if (err) {
1817 iucv_sever_path(nsk, 1);
1818 iucv_sock_kill(nsk);
1819 goto fail;
1820 }
1821
1822 iucv_accept_enqueue(sk, nsk);
1823
1824 /* Wake up accept */
1825 nsk->sk_state = IUCV_CONNECTED;
1826 sk->sk_data_ready(sk);
1827 err = 0;
1828 fail:
1829 bh_unlock_sock(sk);
1830 return 0;
1831 }
1832
1833 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1834 {
1835 struct sock *sk = path->private;
1836
1837 sk->sk_state = IUCV_CONNECTED;
1838 sk->sk_state_change(sk);
1839 }
1840
1841 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1842 {
1843 struct sock *sk = path->private;
1844 struct iucv_sock *iucv = iucv_sk(sk);
1845 struct sk_buff *skb;
1846 struct sock_msg_q *save_msg;
1847 int len;
1848
1849 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1850 pr_iucv->message_reject(path, msg);
1851 return;
1852 }
1853
1854 spin_lock(&iucv->message_q.lock);
1855
1856 if (!list_empty(&iucv->message_q.list) ||
1857 !skb_queue_empty(&iucv->backlog_skb_q))
1858 goto save_message;
1859
1860 len = atomic_read(&sk->sk_rmem_alloc);
1861 len += SKB_TRUESIZE(iucv_msg_length(msg));
1862 if (len > sk->sk_rcvbuf)
1863 goto save_message;
1864
1865 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1866 if (!skb)
1867 goto save_message;
1868
1869 iucv_process_message(sk, skb, path, msg);
1870 goto out_unlock;
1871
1872 save_message:
1873 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1874 if (!save_msg)
1875 goto out_unlock;
1876 save_msg->path = path;
1877 save_msg->msg = *msg;
1878
1879 list_add_tail(&save_msg->list, &iucv->message_q.list);
1880
1881 out_unlock:
1882 spin_unlock(&iucv->message_q.lock);
1883 }
1884
1885 static void iucv_callback_txdone(struct iucv_path *path,
1886 struct iucv_message *msg)
1887 {
1888 struct sock *sk = path->private;
1889 struct sk_buff *this = NULL;
1890 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1891 struct sk_buff *list_skb;
1892 unsigned long flags;
1893
1894 bh_lock_sock(sk);
1895
1896 spin_lock_irqsave(&list->lock, flags);
1897 skb_queue_walk(list, list_skb) {
1898 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1899 this = list_skb;
1900 break;
1901 }
1902 }
1903 if (this)
1904 __skb_unlink(this, list);
1905 spin_unlock_irqrestore(&list->lock, flags);
1906
1907 if (this) {
1908 kfree_skb(this);
1909 /* wake up any process waiting for sending */
1910 iucv_sock_wake_msglim(sk);
1911 }
1912
1913 if (sk->sk_state == IUCV_CLOSING) {
1914 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1915 sk->sk_state = IUCV_CLOSED;
1916 sk->sk_state_change(sk);
1917 }
1918 }
1919 bh_unlock_sock(sk);
1920
1921 }
1922
1923 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1924 {
1925 struct sock *sk = path->private;
1926
1927 if (sk->sk_state == IUCV_CLOSED)
1928 return;
1929
1930 bh_lock_sock(sk);
1931 iucv_sever_path(sk, 1);
1932 sk->sk_state = IUCV_DISCONN;
1933
1934 sk->sk_state_change(sk);
1935 bh_unlock_sock(sk);
1936 }
1937
1938 /* called if the other communication side shuts down its RECV direction;
1939 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1940 */
1941 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1942 {
1943 struct sock *sk = path->private;
1944
1945 bh_lock_sock(sk);
1946 if (sk->sk_state != IUCV_CLOSED) {
1947 sk->sk_shutdown |= SEND_SHUTDOWN;
1948 sk->sk_state_change(sk);
1949 }
1950 bh_unlock_sock(sk);
1951 }
1952
1953 /***************** HiperSockets transport callbacks ********************/
1954 static void afiucv_swap_src_dest(struct sk_buff *skb)
1955 {
1956 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1957 char tmpID[8];
1958 char tmpName[8];
1959
1960 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1961 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1962 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1963 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1964 memcpy(tmpID, trans_hdr->srcUserID, 8);
1965 memcpy(tmpName, trans_hdr->srcAppName, 8);
1966 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1967 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1968 memcpy(trans_hdr->destUserID, tmpID, 8);
1969 memcpy(trans_hdr->destAppName, tmpName, 8);
1970 skb_push(skb, ETH_HLEN);
1971 memset(skb->data, 0, ETH_HLEN);
1972 }
1973
1974 /**
1975 * afiucv_hs_callback_syn - react on received SYN
1976 **/
1977 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1978 {
1979 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1980 struct sock *nsk;
1981 struct iucv_sock *iucv, *niucv;
1982 int err;
1983
1984 iucv = iucv_sk(sk);
1985 if (!iucv) {
1986 /* no sock - connection refused */
1987 afiucv_swap_src_dest(skb);
1988 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1989 err = dev_queue_xmit(skb);
1990 goto out;
1991 }
1992
1993 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1994 bh_lock_sock(sk);
1995 if ((sk->sk_state != IUCV_LISTEN) ||
1996 sk_acceptq_is_full(sk) ||
1997 !nsk) {
1998 /* error on server socket - connection refused */
1999 afiucv_swap_src_dest(skb);
2000 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
2001 err = dev_queue_xmit(skb);
2002 iucv_sock_kill(nsk);
2003 bh_unlock_sock(sk);
2004 goto out;
2005 }
2006
2007 niucv = iucv_sk(nsk);
2008 iucv_sock_init(nsk, sk);
2009 niucv->transport = AF_IUCV_TRANS_HIPER;
2010 niucv->msglimit = iucv->msglimit;
2011 if (!trans_hdr->window)
2012 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
2013 else
2014 niucv->msglimit_peer = trans_hdr->window;
2015 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
2016 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2017 memcpy(niucv->src_name, iucv->src_name, 8);
2018 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2019 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2020 niucv->hs_dev = iucv->hs_dev;
2021 dev_hold(niucv->hs_dev);
2022 afiucv_swap_src_dest(skb);
2023 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2024 trans_hdr->window = niucv->msglimit;
2025 /* if receiver acks the xmit connection is established */
2026 err = dev_queue_xmit(skb);
2027 if (!err) {
2028 iucv_accept_enqueue(sk, nsk);
2029 nsk->sk_state = IUCV_CONNECTED;
2030 sk->sk_data_ready(sk);
2031 } else
2032 iucv_sock_kill(nsk);
2033 bh_unlock_sock(sk);
2034
2035 out:
2036 return NET_RX_SUCCESS;
2037 }
2038
2039 /**
2040 * afiucv_hs_callback_synack() - react on received SYN-ACK
2041 **/
2042 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2043 {
2044 struct iucv_sock *iucv = iucv_sk(sk);
2045
2046 if (!iucv)
2047 goto out;
2048 if (sk->sk_state != IUCV_BOUND)
2049 goto out;
2050 bh_lock_sock(sk);
2051 iucv->msglimit_peer = iucv_trans_hdr(skb)->window;
2052 sk->sk_state = IUCV_CONNECTED;
2053 sk->sk_state_change(sk);
2054 bh_unlock_sock(sk);
2055 out:
2056 kfree_skb(skb);
2057 return NET_RX_SUCCESS;
2058 }
2059
2060 /**
2061 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2062 **/
2063 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2064 {
2065 struct iucv_sock *iucv = iucv_sk(sk);
2066
2067 if (!iucv)
2068 goto out;
2069 if (sk->sk_state != IUCV_BOUND)
2070 goto out;
2071 bh_lock_sock(sk);
2072 sk->sk_state = IUCV_DISCONN;
2073 sk->sk_state_change(sk);
2074 bh_unlock_sock(sk);
2075 out:
2076 kfree_skb(skb);
2077 return NET_RX_SUCCESS;
2078 }
2079
2080 /**
2081 * afiucv_hs_callback_fin() - react on received FIN
2082 **/
2083 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2084 {
2085 struct iucv_sock *iucv = iucv_sk(sk);
2086
2087 /* other end of connection closed */
2088 if (!iucv)
2089 goto out;
2090 bh_lock_sock(sk);
2091 if (sk->sk_state == IUCV_CONNECTED) {
2092 sk->sk_state = IUCV_DISCONN;
2093 sk->sk_state_change(sk);
2094 }
2095 bh_unlock_sock(sk);
2096 out:
2097 kfree_skb(skb);
2098 return NET_RX_SUCCESS;
2099 }
2100
2101 /**
2102 * afiucv_hs_callback_win() - react on received WIN
2103 **/
2104 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2105 {
2106 struct iucv_sock *iucv = iucv_sk(sk);
2107
2108 if (!iucv)
2109 return NET_RX_SUCCESS;
2110
2111 if (sk->sk_state != IUCV_CONNECTED)
2112 return NET_RX_SUCCESS;
2113
2114 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent);
2115 iucv_sock_wake_msglim(sk);
2116 return NET_RX_SUCCESS;
2117 }
2118
2119 /**
2120 * afiucv_hs_callback_rx() - react on received data
2121 **/
2122 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2123 {
2124 struct iucv_sock *iucv = iucv_sk(sk);
2125
2126 if (!iucv) {
2127 kfree_skb(skb);
2128 return NET_RX_SUCCESS;
2129 }
2130
2131 if (sk->sk_state != IUCV_CONNECTED) {
2132 kfree_skb(skb);
2133 return NET_RX_SUCCESS;
2134 }
2135
2136 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2137 kfree_skb(skb);
2138 return NET_RX_SUCCESS;
2139 }
2140
2141 /* write stuff from iucv_msg to skb cb */
2142 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2143 skb_reset_transport_header(skb);
2144 skb_reset_network_header(skb);
2145 IUCV_SKB_CB(skb)->offset = 0;
2146 if (sk_filter(sk, skb)) {
2147 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2148 kfree_skb(skb);
2149 return NET_RX_SUCCESS;
2150 }
2151
2152 spin_lock(&iucv->message_q.lock);
2153 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2154 if (__sock_queue_rcv_skb(sk, skb))
2155 /* handle rcv queue full */
2156 skb_queue_tail(&iucv->backlog_skb_q, skb);
2157 } else
2158 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2159 spin_unlock(&iucv->message_q.lock);
2160 return NET_RX_SUCCESS;
2161 }
2162
2163 /**
2164 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2165 * transport
2166 * called from netif RX softirq
2167 **/
2168 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2169 struct packet_type *pt, struct net_device *orig_dev)
2170 {
2171 struct sock *sk;
2172 struct iucv_sock *iucv;
2173 struct af_iucv_trans_hdr *trans_hdr;
2174 int err = NET_RX_SUCCESS;
2175 char nullstring[8];
2176
2177 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) {
2178 WARN_ONCE(1, "AF_IUCV failed to receive skb, len=%u", skb->len);
2179 kfree_skb(skb);
2180 return NET_RX_SUCCESS;
2181 }
2182
2183 trans_hdr = iucv_trans_hdr(skb);
2184 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2185 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2186 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2187 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2188 memset(nullstring, 0, sizeof(nullstring));
2189 iucv = NULL;
2190 sk = NULL;
2191 read_lock(&iucv_sk_list.lock);
2192 sk_for_each(sk, &iucv_sk_list.head) {
2193 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2194 if ((!memcmp(&iucv_sk(sk)->src_name,
2195 trans_hdr->destAppName, 8)) &&
2196 (!memcmp(&iucv_sk(sk)->src_user_id,
2197 trans_hdr->destUserID, 8)) &&
2198 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2199 (!memcmp(&iucv_sk(sk)->dst_user_id,
2200 nullstring, 8))) {
2201 iucv = iucv_sk(sk);
2202 break;
2203 }
2204 } else {
2205 if ((!memcmp(&iucv_sk(sk)->src_name,
2206 trans_hdr->destAppName, 8)) &&
2207 (!memcmp(&iucv_sk(sk)->src_user_id,
2208 trans_hdr->destUserID, 8)) &&
2209 (!memcmp(&iucv_sk(sk)->dst_name,
2210 trans_hdr->srcAppName, 8)) &&
2211 (!memcmp(&iucv_sk(sk)->dst_user_id,
2212 trans_hdr->srcUserID, 8))) {
2213 iucv = iucv_sk(sk);
2214 break;
2215 }
2216 }
2217 }
2218 read_unlock(&iucv_sk_list.lock);
2219 if (!iucv)
2220 sk = NULL;
2221
2222 /* no sock
2223 how should we send with no sock
2224 1) send without sock no send rc checking?
2225 2) introduce default sock to handle this cases
2226
2227 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2228 data -> send FIN
2229 SYN|ACK, SYN|FIN, FIN -> no action? */
2230
2231 switch (trans_hdr->flags) {
2232 case AF_IUCV_FLAG_SYN:
2233 /* connect request */
2234 err = afiucv_hs_callback_syn(sk, skb);
2235 break;
2236 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2237 /* connect request confirmed */
2238 err = afiucv_hs_callback_synack(sk, skb);
2239 break;
2240 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2241 /* connect request refused */
2242 err = afiucv_hs_callback_synfin(sk, skb);
2243 break;
2244 case (AF_IUCV_FLAG_FIN):
2245 /* close request */
2246 err = afiucv_hs_callback_fin(sk, skb);
2247 break;
2248 case (AF_IUCV_FLAG_WIN):
2249 err = afiucv_hs_callback_win(sk, skb);
2250 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2251 kfree_skb(skb);
2252 break;
2253 }
2254 /* fall through - and receive non-zero length data */
2255 case (AF_IUCV_FLAG_SHT):
2256 /* shutdown request */
2257 /* fall through - and receive zero length data */
2258 case 0:
2259 /* plain data frame */
2260 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2261 err = afiucv_hs_callback_rx(sk, skb);
2262 break;
2263 default:
2264 kfree_skb(skb);
2265 }
2266
2267 return err;
2268 }
2269
2270 /**
2271 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2272 * transport
2273 **/
2274 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2275 enum iucv_tx_notify n)
2276 {
2277 struct sock *isk = skb->sk;
2278 struct sock *sk = NULL;
2279 struct iucv_sock *iucv = NULL;
2280 struct sk_buff_head *list;
2281 struct sk_buff *list_skb;
2282 struct sk_buff *nskb;
2283 unsigned long flags;
2284
2285 read_lock_irqsave(&iucv_sk_list.lock, flags);
2286 sk_for_each(sk, &iucv_sk_list.head)
2287 if (sk == isk) {
2288 iucv = iucv_sk(sk);
2289 break;
2290 }
2291 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2292
2293 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2294 return;
2295
2296 list = &iucv->send_skb_q;
2297 spin_lock_irqsave(&list->lock, flags);
2298 skb_queue_walk_safe(list, list_skb, nskb) {
2299 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2300 switch (n) {
2301 case TX_NOTIFY_OK:
2302 __skb_unlink(list_skb, list);
2303 kfree_skb(list_skb);
2304 iucv_sock_wake_msglim(sk);
2305 break;
2306 case TX_NOTIFY_PENDING:
2307 atomic_inc(&iucv->pendings);
2308 break;
2309 case TX_NOTIFY_DELAYED_OK:
2310 __skb_unlink(list_skb, list);
2311 atomic_dec(&iucv->pendings);
2312 if (atomic_read(&iucv->pendings) <= 0)
2313 iucv_sock_wake_msglim(sk);
2314 kfree_skb(list_skb);
2315 break;
2316 case TX_NOTIFY_UNREACHABLE:
2317 case TX_NOTIFY_DELAYED_UNREACHABLE:
2318 case TX_NOTIFY_TPQFULL: /* not yet used */
2319 case TX_NOTIFY_GENERALERROR:
2320 case TX_NOTIFY_DELAYED_GENERALERROR:
2321 __skb_unlink(list_skb, list);
2322 kfree_skb(list_skb);
2323 if (sk->sk_state == IUCV_CONNECTED) {
2324 sk->sk_state = IUCV_DISCONN;
2325 sk->sk_state_change(sk);
2326 }
2327 break;
2328 }
2329 break;
2330 }
2331 }
2332 spin_unlock_irqrestore(&list->lock, flags);
2333
2334 if (sk->sk_state == IUCV_CLOSING) {
2335 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2336 sk->sk_state = IUCV_CLOSED;
2337 sk->sk_state_change(sk);
2338 }
2339 }
2340
2341 }
2342
2343 /*
2344 * afiucv_netdev_event: handle netdev notifier chain events
2345 */
2346 static int afiucv_netdev_event(struct notifier_block *this,
2347 unsigned long event, void *ptr)
2348 {
2349 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2350 struct sock *sk;
2351 struct iucv_sock *iucv;
2352
2353 switch (event) {
2354 case NETDEV_REBOOT:
2355 case NETDEV_GOING_DOWN:
2356 sk_for_each(sk, &iucv_sk_list.head) {
2357 iucv = iucv_sk(sk);
2358 if ((iucv->hs_dev == event_dev) &&
2359 (sk->sk_state == IUCV_CONNECTED)) {
2360 if (event == NETDEV_GOING_DOWN)
2361 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2362 sk->sk_state = IUCV_DISCONN;
2363 sk->sk_state_change(sk);
2364 }
2365 }
2366 break;
2367 case NETDEV_DOWN:
2368 case NETDEV_UNREGISTER:
2369 default:
2370 break;
2371 }
2372 return NOTIFY_DONE;
2373 }
2374
2375 static struct notifier_block afiucv_netdev_notifier = {
2376 .notifier_call = afiucv_netdev_event,
2377 };
2378
2379 static const struct proto_ops iucv_sock_ops = {
2380 .family = PF_IUCV,
2381 .owner = THIS_MODULE,
2382 .release = iucv_sock_release,
2383 .bind = iucv_sock_bind,
2384 .connect = iucv_sock_connect,
2385 .listen = iucv_sock_listen,
2386 .accept = iucv_sock_accept,
2387 .getname = iucv_sock_getname,
2388 .sendmsg = iucv_sock_sendmsg,
2389 .recvmsg = iucv_sock_recvmsg,
2390 .poll = iucv_sock_poll,
2391 .ioctl = sock_no_ioctl,
2392 .mmap = sock_no_mmap,
2393 .socketpair = sock_no_socketpair,
2394 .shutdown = iucv_sock_shutdown,
2395 .setsockopt = iucv_sock_setsockopt,
2396 .getsockopt = iucv_sock_getsockopt,
2397 };
2398
2399 static const struct net_proto_family iucv_sock_family_ops = {
2400 .family = AF_IUCV,
2401 .owner = THIS_MODULE,
2402 .create = iucv_sock_create,
2403 };
2404
2405 static struct packet_type iucv_packet_type = {
2406 .type = cpu_to_be16(ETH_P_AF_IUCV),
2407 .func = afiucv_hs_rcv,
2408 };
2409
2410 static int afiucv_iucv_init(void)
2411 {
2412 int err;
2413
2414 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2415 if (err)
2416 goto out;
2417 /* establish dummy device */
2418 af_iucv_driver.bus = pr_iucv->bus;
2419 err = driver_register(&af_iucv_driver);
2420 if (err)
2421 goto out_iucv;
2422 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2423 if (!af_iucv_dev) {
2424 err = -ENOMEM;
2425 goto out_driver;
2426 }
2427 dev_set_name(af_iucv_dev, "af_iucv");
2428 af_iucv_dev->bus = pr_iucv->bus;
2429 af_iucv_dev->parent = pr_iucv->root;
2430 af_iucv_dev->release = (void (*)(struct device *))kfree;
2431 af_iucv_dev->driver = &af_iucv_driver;
2432 err = device_register(af_iucv_dev);
2433 if (err)
2434 goto out_iucv_dev;
2435 return 0;
2436
2437 out_iucv_dev:
2438 put_device(af_iucv_dev);
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 void afiucv_iucv_exit(void)
2448 {
2449 device_unregister(af_iucv_dev);
2450 driver_unregister(&af_iucv_driver);
2451 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2452 }
2453
2454 static int __init afiucv_init(void)
2455 {
2456 int err;
2457
2458 if (MACHINE_IS_VM) {
2459 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2460 if (unlikely(err)) {
2461 WARN_ON(err);
2462 err = -EPROTONOSUPPORT;
2463 goto out;
2464 }
2465
2466 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2467 if (!pr_iucv) {
2468 printk(KERN_WARNING "iucv_if lookup failed\n");
2469 memset(&iucv_userid, 0, sizeof(iucv_userid));
2470 }
2471 } else {
2472 memset(&iucv_userid, 0, sizeof(iucv_userid));
2473 pr_iucv = NULL;
2474 }
2475
2476 err = proto_register(&iucv_proto, 0);
2477 if (err)
2478 goto out;
2479 err = sock_register(&iucv_sock_family_ops);
2480 if (err)
2481 goto out_proto;
2482
2483 if (pr_iucv) {
2484 err = afiucv_iucv_init();
2485 if (err)
2486 goto out_sock;
2487 }
2488
2489 err = register_netdevice_notifier(&afiucv_netdev_notifier);
2490 if (err)
2491 goto out_notifier;
2492
2493 dev_add_pack(&iucv_packet_type);
2494 return 0;
2495
2496 out_notifier:
2497 if (pr_iucv)
2498 afiucv_iucv_exit();
2499 out_sock:
2500 sock_unregister(PF_IUCV);
2501 out_proto:
2502 proto_unregister(&iucv_proto);
2503 out:
2504 if (pr_iucv)
2505 symbol_put(iucv_if);
2506 return err;
2507 }
2508
2509 static void __exit afiucv_exit(void)
2510 {
2511 if (pr_iucv) {
2512 afiucv_iucv_exit();
2513 symbol_put(iucv_if);
2514 }
2515
2516 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2517 dev_remove_pack(&iucv_packet_type);
2518 sock_unregister(PF_IUCV);
2519 proto_unregister(&iucv_proto);
2520 }
2521
2522 module_init(afiucv_init);
2523 module_exit(afiucv_exit);
2524
2525 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2526 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2527 MODULE_VERSION(VERSION);
2528 MODULE_LICENSE("GPL");
2529 MODULE_ALIAS_NETPROTO(PF_IUCV);
connection oriented routing