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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / net / iucv / af_iucv.c
blobe2f16a0173a93bc876e293a68878d83d78cda7ef
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
154 #ifdef CONFIG_PM_DEBUG
155 printk(KERN_WARNING "afiucv_pm_freeze\n");
156 #endif
157 read_lock(&iucv_sk_list.lock);
158 sk_for_each(sk, &iucv_sk_list.head) {
159 iucv = iucv_sk(sk);
160 switch (sk->sk_state) {
161 case IUCV_DISCONN:
162 case IUCV_CLOSING:
163 case IUCV_CONNECTED:
164 iucv_sever_path(sk, 0);
165 break;
166 case IUCV_OPEN:
167 case IUCV_BOUND:
168 case IUCV_LISTEN:
169 case IUCV_CLOSED:
170 default:
171 break;
172 }
173 skb_queue_purge(&iucv->send_skb_q);
174 skb_queue_purge(&iucv->backlog_skb_q);
175 }
176 read_unlock(&iucv_sk_list.lock);
177 return 0;
178 }
179
180 /**
181 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
182 * @dev: AFIUCV dummy device
183 *
184 * socket clean up after freeze
185 */
186 static int afiucv_pm_restore_thaw(struct device *dev)
187 {
188 struct sock *sk;
189
190 #ifdef CONFIG_PM_DEBUG
191 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
192 #endif
193 read_lock(&iucv_sk_list.lock);
194 sk_for_each(sk, &iucv_sk_list.head) {
195 switch (sk->sk_state) {
196 case IUCV_CONNECTED:
197 sk->sk_err = EPIPE;
198 sk->sk_state = IUCV_DISCONN;
199 sk->sk_state_change(sk);
200 break;
201 case IUCV_DISCONN:
202 case IUCV_CLOSING:
203 case IUCV_LISTEN:
204 case IUCV_BOUND:
205 case IUCV_OPEN:
206 default:
207 break;
208 }
209 }
210 read_unlock(&iucv_sk_list.lock);
211 return 0;
212 }
213
214 static const struct dev_pm_ops afiucv_pm_ops = {
215 .prepare = afiucv_pm_prepare,
216 .complete = afiucv_pm_complete,
217 .freeze = afiucv_pm_freeze,
218 .thaw = afiucv_pm_restore_thaw,
219 .restore = afiucv_pm_restore_thaw,
220 };
221
222 static struct device_driver af_iucv_driver = {
223 .owner = THIS_MODULE,
224 .name = "afiucv",
225 .bus = NULL,
226 .pm = &afiucv_pm_ops,
227 };
228
229 /* dummy device used as trigger for PM functions */
230 static struct device *af_iucv_dev;
231
232 /**
233 * iucv_msg_length() - Returns the length of an iucv message.
234 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
235 *
236 * The function returns the length of the specified iucv message @msg of data
237 * stored in a buffer and of data stored in the parameter list (PRMDATA).
238 *
239 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
240 * data:
241 * PRMDATA[0..6] socket data (max 7 bytes);
242 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
243 *
244 * The socket data length is computed by subtracting the socket data length
245 * value from 0xFF.
246 * If the socket data len is greater 7, then PRMDATA can be used for special
247 * notifications (see iucv_sock_shutdown); and further,
248 * if the socket data len is > 7, the function returns 8.
249 *
250 * Use this function to allocate socket buffers to store iucv message data.
251 */
252 static inline size_t iucv_msg_length(struct iucv_message *msg)
253 {
254 size_t datalen;
255
256 if (msg->flags & IUCV_IPRMDATA) {
257 datalen = 0xff - msg->rmmsg[7];
258 return (datalen < 8) ? datalen : 8;
259 }
260 return msg->length;
261 }
262
263 /**
264 * iucv_sock_in_state() - check for specific states
265 * @sk: sock structure
266 * @state: first iucv sk state
267 * @state: second iucv sk state
268 *
269 * Returns true if the socket in either in the first or second state.
270 */
271 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
272 {
273 return (sk->sk_state == state || sk->sk_state == state2);
274 }
275
276 /**
277 * iucv_below_msglim() - function to check if messages can be sent
278 * @sk: sock structure
279 *
280 * Returns true if the send queue length is lower than the message limit.
281 * Always returns true if the socket is not connected (no iucv path for
282 * checking the message limit).
283 */
284 static inline int iucv_below_msglim(struct sock *sk)
285 {
286 struct iucv_sock *iucv = iucv_sk(sk);
287
288 if (sk->sk_state != IUCV_CONNECTED)
289 return 1;
290 if (iucv->transport == AF_IUCV_TRANS_IUCV)
291 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
292 else
293 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
294 (atomic_read(&iucv->pendings) <= 0));
295 }
296
297 /**
298 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
299 */
300 static void iucv_sock_wake_msglim(struct sock *sk)
301 {
302 struct socket_wq *wq;
303
304 rcu_read_lock();
305 wq = rcu_dereference(sk->sk_wq);
306 if (skwq_has_sleeper(wq))
307 wake_up_interruptible_all(&wq->wait);
308 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
309 rcu_read_unlock();
310 }
311
312 /**
313 * afiucv_hs_send() - send a message through HiperSockets transport
314 */
315 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
316 struct sk_buff *skb, u8 flags)
317 {
318 struct iucv_sock *iucv = iucv_sk(sock);
319 struct af_iucv_trans_hdr *phs_hdr;
320 struct sk_buff *nskb;
321 int err, confirm_recv = 0;
322
323 memset(skb->head, 0, ETH_HLEN);
324 phs_hdr = skb_push(skb, sizeof(struct af_iucv_trans_hdr));
325 skb_reset_mac_header(skb);
326 skb_reset_network_header(skb);
327 skb_push(skb, ETH_HLEN);
328 skb_reset_mac_header(skb);
329 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
330
331 phs_hdr->magic = ETH_P_AF_IUCV;
332 phs_hdr->version = 1;
333 phs_hdr->flags = flags;
334 if (flags == AF_IUCV_FLAG_SYN)
335 phs_hdr->window = iucv->msglimit;
336 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
337 confirm_recv = atomic_read(&iucv->msg_recv);
338 phs_hdr->window = confirm_recv;
339 if (confirm_recv)
340 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
341 }
342 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
343 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
344 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
345 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
346 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
347 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
348 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
349 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
350 if (imsg)
351 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
352
353 skb->dev = iucv->hs_dev;
354 if (!skb->dev) {
355 err = -ENODEV;
356 goto err_free;
357 }
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
359 err = -ENETDOWN;
360 goto err_free;
361 }
362 if (skb->len > skb->dev->mtu) {
363 if (sock->sk_type == SOCK_SEQPACKET) {
364 err = -EMSGSIZE;
365 goto err_free;
366 }
367 skb_trim(skb, skb->dev->mtu);
368 }
369 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
370 nskb = skb_clone(skb, GFP_ATOMIC);
371 if (!nskb) {
372 err = -ENOMEM;
373 goto err_free;
374 }
375
376 skb_queue_tail(&iucv->send_skb_q, nskb);
377 err = dev_queue_xmit(skb);
378 if (net_xmit_eval(err)) {
379 skb_unlink(nskb, &iucv->send_skb_q);
380 kfree_skb(nskb);
381 } else {
382 atomic_sub(confirm_recv, &iucv->msg_recv);
383 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
384 }
385 return net_xmit_eval(err);
386
387 err_free:
388 kfree_skb(skb);
389 return err;
390 }
391
392 static struct sock *__iucv_get_sock_by_name(char *nm)
393 {
394 struct sock *sk;
395
396 sk_for_each(sk, &iucv_sk_list.head)
397 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
398 return sk;
399
400 return NULL;
401 }
402
403 static void iucv_sock_destruct(struct sock *sk)
404 {
405 skb_queue_purge(&sk->sk_receive_queue);
406 skb_queue_purge(&sk->sk_error_queue);
407
408 sk_mem_reclaim(sk);
409
410 if (!sock_flag(sk, SOCK_DEAD)) {
411 pr_err("Attempt to release alive iucv socket %p\n", sk);
412 return;
413 }
414
415 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
416 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
417 WARN_ON(sk->sk_wmem_queued);
418 WARN_ON(sk->sk_forward_alloc);
419 }
420
421 /* Cleanup Listen */
422 static void iucv_sock_cleanup_listen(struct sock *parent)
423 {
424 struct sock *sk;
425
426 /* Close non-accepted connections */
427 while ((sk = iucv_accept_dequeue(parent, NULL))) {
428 iucv_sock_close(sk);
429 iucv_sock_kill(sk);
430 }
431
432 parent->sk_state = IUCV_CLOSED;
433 }
434
435 /* Kill socket (only if zapped and orphaned) */
436 static void iucv_sock_kill(struct sock *sk)
437 {
438 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
439 return;
440
441 iucv_sock_unlink(&iucv_sk_list, sk);
442 sock_set_flag(sk, SOCK_DEAD);
443 sock_put(sk);
444 }
445
446 /* Terminate an IUCV path */
447 static void iucv_sever_path(struct sock *sk, int with_user_data)
448 {
449 unsigned char user_data[16];
450 struct iucv_sock *iucv = iucv_sk(sk);
451 struct iucv_path *path = iucv->path;
452
453 if (iucv->path) {
454 iucv->path = NULL;
455 if (with_user_data) {
456 low_nmcpy(user_data, iucv->src_name);
457 high_nmcpy(user_data, iucv->dst_name);
458 ASCEBC(user_data, sizeof(user_data));
459 pr_iucv->path_sever(path, user_data);
460 } else
461 pr_iucv->path_sever(path, NULL);
462 iucv_path_free(path);
463 }
464 }
465
466 /* Send controlling flags through an IUCV socket for HIPER transport */
467 static int iucv_send_ctrl(struct sock *sk, u8 flags)
468 {
469 int err = 0;
470 int blen;
471 struct sk_buff *skb;
472 u8 shutdown = 0;
473
474 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
475 if (sk->sk_shutdown & SEND_SHUTDOWN) {
476 /* controlling flags should be sent anyway */
477 shutdown = sk->sk_shutdown;
478 sk->sk_shutdown &= RCV_SHUTDOWN;
479 }
480 skb = sock_alloc_send_skb(sk, blen, 1, &err);
481 if (skb) {
482 skb_reserve(skb, blen);
483 err = afiucv_hs_send(NULL, sk, skb, flags);
484 }
485 if (shutdown)
486 sk->sk_shutdown = shutdown;
487 return err;
488 }
489
490 /* Close an IUCV socket */
491 static void iucv_sock_close(struct sock *sk)
492 {
493 struct iucv_sock *iucv = iucv_sk(sk);
494 unsigned long timeo;
495 int err = 0;
496
497 lock_sock(sk);
498
499 switch (sk->sk_state) {
500 case IUCV_LISTEN:
501 iucv_sock_cleanup_listen(sk);
502 break;
503
504 case IUCV_CONNECTED:
505 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
506 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
507 sk->sk_state = IUCV_DISCONN;
508 sk->sk_state_change(sk);
509 }
510 case IUCV_DISCONN: /* fall through */
511 sk->sk_state = IUCV_CLOSING;
512 sk->sk_state_change(sk);
513
514 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
515 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
516 timeo = sk->sk_lingertime;
517 else
518 timeo = IUCV_DISCONN_TIMEOUT;
519 iucv_sock_wait(sk,
520 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
521 timeo);
522 }
523
524 case IUCV_CLOSING: /* fall through */
525 sk->sk_state = IUCV_CLOSED;
526 sk->sk_state_change(sk);
527
528 sk->sk_err = ECONNRESET;
529 sk->sk_state_change(sk);
530
531 skb_queue_purge(&iucv->send_skb_q);
532 skb_queue_purge(&iucv->backlog_skb_q);
533
534 default: /* fall through */
535 iucv_sever_path(sk, 1);
536 }
537
538 if (iucv->hs_dev) {
539 dev_put(iucv->hs_dev);
540 iucv->hs_dev = NULL;
541 sk->sk_bound_dev_if = 0;
542 }
543
544 /* mark socket for deletion by iucv_sock_kill() */
545 sock_set_flag(sk, SOCK_ZAPPED);
546
547 release_sock(sk);
548 }
549
550 static void iucv_sock_init(struct sock *sk, struct sock *parent)
551 {
552 if (parent) {
553 sk->sk_type = parent->sk_type;
554 security_sk_clone(parent, sk);
555 }
556 }
557
558 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
559 {
560 struct sock *sk;
561 struct iucv_sock *iucv;
562
563 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
564 if (!sk)
565 return NULL;
566 iucv = iucv_sk(sk);
567
568 sock_init_data(sock, sk);
569 INIT_LIST_HEAD(&iucv->accept_q);
570 spin_lock_init(&iucv->accept_q_lock);
571 skb_queue_head_init(&iucv->send_skb_q);
572 INIT_LIST_HEAD(&iucv->message_q.list);
573 spin_lock_init(&iucv->message_q.lock);
574 skb_queue_head_init(&iucv->backlog_skb_q);
575 iucv->send_tag = 0;
576 atomic_set(&iucv->pendings, 0);
577 iucv->flags = 0;
578 iucv->msglimit = 0;
579 atomic_set(&iucv->msg_sent, 0);
580 atomic_set(&iucv->msg_recv, 0);
581 iucv->path = NULL;
582 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
583 memset(&iucv->src_user_id , 0, 32);
584 if (pr_iucv)
585 iucv->transport = AF_IUCV_TRANS_IUCV;
586 else
587 iucv->transport = AF_IUCV_TRANS_HIPER;
588
589 sk->sk_destruct = iucv_sock_destruct;
590 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
591 sk->sk_allocation = GFP_DMA;
592
593 sock_reset_flag(sk, SOCK_ZAPPED);
594
595 sk->sk_protocol = proto;
596 sk->sk_state = IUCV_OPEN;
597
598 iucv_sock_link(&iucv_sk_list, sk);
599 return sk;
600 }
601
602 /* Create an IUCV socket */
603 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
604 int kern)
605 {
606 struct sock *sk;
607
608 if (protocol && protocol != PF_IUCV)
609 return -EPROTONOSUPPORT;
610
611 sock->state = SS_UNCONNECTED;
612
613 switch (sock->type) {
614 case SOCK_STREAM:
615 sock->ops = &iucv_sock_ops;
616 break;
617 case SOCK_SEQPACKET:
618 /* currently, proto ops can handle both sk types */
619 sock->ops = &iucv_sock_ops;
620 break;
621 default:
622 return -ESOCKTNOSUPPORT;
623 }
624
625 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
626 if (!sk)
627 return -ENOMEM;
628
629 iucv_sock_init(sk, NULL);
630
631 return 0;
632 }
633
634 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
635 {
636 write_lock_bh(&l->lock);
637 sk_add_node(sk, &l->head);
638 write_unlock_bh(&l->lock);
639 }
640
641 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
642 {
643 write_lock_bh(&l->lock);
644 sk_del_node_init(sk);
645 write_unlock_bh(&l->lock);
646 }
647
648 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
649 {
650 unsigned long flags;
651 struct iucv_sock *par = iucv_sk(parent);
652
653 sock_hold(sk);
654 spin_lock_irqsave(&par->accept_q_lock, flags);
655 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
656 spin_unlock_irqrestore(&par->accept_q_lock, flags);
657 iucv_sk(sk)->parent = parent;
658 sk_acceptq_added(parent);
659 }
660
661 void iucv_accept_unlink(struct sock *sk)
662 {
663 unsigned long flags;
664 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
665
666 spin_lock_irqsave(&par->accept_q_lock, flags);
667 list_del_init(&iucv_sk(sk)->accept_q);
668 spin_unlock_irqrestore(&par->accept_q_lock, flags);
669 sk_acceptq_removed(iucv_sk(sk)->parent);
670 iucv_sk(sk)->parent = NULL;
671 sock_put(sk);
672 }
673
674 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
675 {
676 struct iucv_sock *isk, *n;
677 struct sock *sk;
678
679 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
680 sk = (struct sock *) isk;
681 lock_sock(sk);
682
683 if (sk->sk_state == IUCV_CLOSED) {
684 iucv_accept_unlink(sk);
685 release_sock(sk);
686 continue;
687 }
688
689 if (sk->sk_state == IUCV_CONNECTED ||
690 sk->sk_state == IUCV_DISCONN ||
691 !newsock) {
692 iucv_accept_unlink(sk);
693 if (newsock)
694 sock_graft(sk, newsock);
695
696 release_sock(sk);
697 return sk;
698 }
699
700 release_sock(sk);
701 }
702 return NULL;
703 }
704
705 static void __iucv_auto_name(struct iucv_sock *iucv)
706 {
707 char name[12];
708
709 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
710 while (__iucv_get_sock_by_name(name)) {
711 sprintf(name, "%08x",
712 atomic_inc_return(&iucv_sk_list.autobind_name));
713 }
714 memcpy(iucv->src_name, name, 8);
715 }
716
717 /* Bind an unbound socket */
718 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
719 int addr_len)
720 {
721 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
722 struct sock *sk = sock->sk;
723 struct iucv_sock *iucv;
724 int err = 0;
725 struct net_device *dev;
726 char uid[9];
727
728 /* Verify the input sockaddr */
729 if (addr_len < sizeof(struct sockaddr_iucv) ||
730 addr->sa_family != AF_IUCV)
731 return -EINVAL;
732
733 lock_sock(sk);
734 if (sk->sk_state != IUCV_OPEN) {
735 err = -EBADFD;
736 goto done;
737 }
738
739 write_lock_bh(&iucv_sk_list.lock);
740
741 iucv = iucv_sk(sk);
742 if (__iucv_get_sock_by_name(sa->siucv_name)) {
743 err = -EADDRINUSE;
744 goto done_unlock;
745 }
746 if (iucv->path)
747 goto done_unlock;
748
749 /* Bind the socket */
750 if (pr_iucv)
751 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
752 goto vm_bind; /* VM IUCV transport */
753
754 /* try hiper transport */
755 memcpy(uid, sa->siucv_user_id, sizeof(uid));
756 ASCEBC(uid, 8);
757 rcu_read_lock();
758 for_each_netdev_rcu(&init_net, dev) {
759 if (!memcmp(dev->perm_addr, uid, 8)) {
760 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
761 /* Check for unitialized siucv_name */
762 if (strncmp(sa->siucv_name, " ", 8) == 0)
763 __iucv_auto_name(iucv);
764 else
765 memcpy(iucv->src_name, sa->siucv_name, 8);
766 sk->sk_bound_dev_if = dev->ifindex;
767 iucv->hs_dev = dev;
768 dev_hold(dev);
769 sk->sk_state = IUCV_BOUND;
770 iucv->transport = AF_IUCV_TRANS_HIPER;
771 if (!iucv->msglimit)
772 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
773 rcu_read_unlock();
774 goto done_unlock;
775 }
776 }
777 rcu_read_unlock();
778 vm_bind:
779 if (pr_iucv) {
780 /* use local userid for backward compat */
781 memcpy(iucv->src_name, sa->siucv_name, 8);
782 memcpy(iucv->src_user_id, iucv_userid, 8);
783 sk->sk_state = IUCV_BOUND;
784 iucv->transport = AF_IUCV_TRANS_IUCV;
785 if (!iucv->msglimit)
786 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
787 goto done_unlock;
788 }
789 /* found no dev to bind */
790 err = -ENODEV;
791 done_unlock:
792 /* Release the socket list lock */
793 write_unlock_bh(&iucv_sk_list.lock);
794 done:
795 release_sock(sk);
796 return err;
797 }
798
799 /* Automatically bind an unbound socket */
800 static int iucv_sock_autobind(struct sock *sk)
801 {
802 struct iucv_sock *iucv = iucv_sk(sk);
803 int err = 0;
804
805 if (unlikely(!pr_iucv))
806 return -EPROTO;
807
808 memcpy(iucv->src_user_id, iucv_userid, 8);
809
810 write_lock_bh(&iucv_sk_list.lock);
811 __iucv_auto_name(iucv);
812 write_unlock_bh(&iucv_sk_list.lock);
813
814 if (!iucv->msglimit)
815 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
816
817 return err;
818 }
819
820 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
821 {
822 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
823 struct sock *sk = sock->sk;
824 struct iucv_sock *iucv = iucv_sk(sk);
825 unsigned char user_data[16];
826 int err;
827
828 high_nmcpy(user_data, sa->siucv_name);
829 low_nmcpy(user_data, iucv->src_name);
830 ASCEBC(user_data, sizeof(user_data));
831
832 /* Create path. */
833 iucv->path = iucv_path_alloc(iucv->msglimit,
834 IUCV_IPRMDATA, GFP_KERNEL);
835 if (!iucv->path) {
836 err = -ENOMEM;
837 goto done;
838 }
839 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
840 sa->siucv_user_id, NULL, user_data,
841 sk);
842 if (err) {
843 iucv_path_free(iucv->path);
844 iucv->path = NULL;
845 switch (err) {
846 case 0x0b: /* Target communicator is not logged on */
847 err = -ENETUNREACH;
848 break;
849 case 0x0d: /* Max connections for this guest exceeded */
850 case 0x0e: /* Max connections for target guest exceeded */
851 err = -EAGAIN;
852 break;
853 case 0x0f: /* Missing IUCV authorization */
854 err = -EACCES;
855 break;
856 default:
857 err = -ECONNREFUSED;
858 break;
859 }
860 }
861 done:
862 return err;
863 }
864
865 /* Connect an unconnected socket */
866 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
867 int alen, int flags)
868 {
869 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
870 struct sock *sk = sock->sk;
871 struct iucv_sock *iucv = iucv_sk(sk);
872 int err;
873
874 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
875 return -EINVAL;
876
877 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
878 return -EBADFD;
879
880 if (sk->sk_state == IUCV_OPEN &&
881 iucv->transport == AF_IUCV_TRANS_HIPER)
882 return -EBADFD; /* explicit bind required */
883
884 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
885 return -EINVAL;
886
887 if (sk->sk_state == IUCV_OPEN) {
888 err = iucv_sock_autobind(sk);
889 if (unlikely(err))
890 return err;
891 }
892
893 lock_sock(sk);
894
895 /* Set the destination information */
896 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
897 memcpy(iucv->dst_name, sa->siucv_name, 8);
898
899 if (iucv->transport == AF_IUCV_TRANS_HIPER)
900 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
901 else
902 err = afiucv_path_connect(sock, addr);
903 if (err)
904 goto done;
905
906 if (sk->sk_state != IUCV_CONNECTED)
907 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
908 IUCV_DISCONN),
909 sock_sndtimeo(sk, flags & O_NONBLOCK));
910
911 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
912 err = -ECONNREFUSED;
913
914 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
915 iucv_sever_path(sk, 0);
916
917 done:
918 release_sock(sk);
919 return err;
920 }
921
922 /* Move a socket into listening state. */
923 static int iucv_sock_listen(struct socket *sock, int backlog)
924 {
925 struct sock *sk = sock->sk;
926 int err;
927
928 lock_sock(sk);
929
930 err = -EINVAL;
931 if (sk->sk_state != IUCV_BOUND)
932 goto done;
933
934 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
935 goto done;
936
937 sk->sk_max_ack_backlog = backlog;
938 sk->sk_ack_backlog = 0;
939 sk->sk_state = IUCV_LISTEN;
940 err = 0;
941
942 done:
943 release_sock(sk);
944 return err;
945 }
946
947 /* Accept a pending connection */
948 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
949 int flags, bool kern)
950 {
951 DECLARE_WAITQUEUE(wait, current);
952 struct sock *sk = sock->sk, *nsk;
953 long timeo;
954 int err = 0;
955
956 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
957
958 if (sk->sk_state != IUCV_LISTEN) {
959 err = -EBADFD;
960 goto done;
961 }
962
963 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
964
965 /* Wait for an incoming connection */
966 add_wait_queue_exclusive(sk_sleep(sk), &wait);
967 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
968 set_current_state(TASK_INTERRUPTIBLE);
969 if (!timeo) {
970 err = -EAGAIN;
971 break;
972 }
973
974 release_sock(sk);
975 timeo = schedule_timeout(timeo);
976 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
977
978 if (sk->sk_state != IUCV_LISTEN) {
979 err = -EBADFD;
980 break;
981 }
982
983 if (signal_pending(current)) {
984 err = sock_intr_errno(timeo);
985 break;
986 }
987 }
988
989 set_current_state(TASK_RUNNING);
990 remove_wait_queue(sk_sleep(sk), &wait);
991
992 if (err)
993 goto done;
994
995 newsock->state = SS_CONNECTED;
996
997 done:
998 release_sock(sk);
999 return err;
1000 }
1001
1002 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
1003 int peer)
1004 {
1005 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
1006 struct sock *sk = sock->sk;
1007 struct iucv_sock *iucv = iucv_sk(sk);
1008
1009 addr->sa_family = AF_IUCV;
1010
1011 if (peer) {
1012 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1013 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1014 } else {
1015 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1016 memcpy(siucv->siucv_name, iucv->src_name, 8);
1017 }
1018 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1019 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1020 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1021
1022 return sizeof(struct sockaddr_iucv);
1023 }
1024
1025 /**
1026 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1027 * @path: IUCV path
1028 * @msg: Pointer to a struct iucv_message
1029 * @skb: The socket data to send, skb->len MUST BE <= 7
1030 *
1031 * Send the socket data in the parameter list in the iucv message
1032 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1033 * list and the socket data len at index 7 (last byte).
1034 * See also iucv_msg_length().
1035 *
1036 * Returns the error code from the iucv_message_send() call.
1037 */
1038 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1039 struct sk_buff *skb)
1040 {
1041 u8 prmdata[8];
1042
1043 memcpy(prmdata, (void *) skb->data, skb->len);
1044 prmdata[7] = 0xff - (u8) skb->len;
1045 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1046 (void *) prmdata, 8);
1047 }
1048
1049 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1050 size_t len)
1051 {
1052 struct sock *sk = sock->sk;
1053 struct iucv_sock *iucv = iucv_sk(sk);
1054 size_t headroom = 0;
1055 size_t linear;
1056 struct sk_buff *skb;
1057 struct iucv_message txmsg = {0};
1058 struct cmsghdr *cmsg;
1059 int cmsg_done;
1060 long timeo;
1061 char user_id[9];
1062 char appl_id[9];
1063 int err;
1064 int noblock = msg->msg_flags & MSG_DONTWAIT;
1065
1066 err = sock_error(sk);
1067 if (err)
1068 return err;
1069
1070 if (msg->msg_flags & MSG_OOB)
1071 return -EOPNOTSUPP;
1072
1073 /* SOCK_SEQPACKET: we do not support segmented records */
1074 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1075 return -EOPNOTSUPP;
1076
1077 lock_sock(sk);
1078
1079 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1080 err = -EPIPE;
1081 goto out;
1082 }
1083
1084 /* Return if the socket is not in connected state */
1085 if (sk->sk_state != IUCV_CONNECTED) {
1086 err = -ENOTCONN;
1087 goto out;
1088 }
1089
1090 /* initialize defaults */
1091 cmsg_done = 0; /* check for duplicate headers */
1092 txmsg.class = 0;
1093
1094 /* iterate over control messages */
1095 for_each_cmsghdr(cmsg, msg) {
1096 if (!CMSG_OK(msg, cmsg)) {
1097 err = -EINVAL;
1098 goto out;
1099 }
1100
1101 if (cmsg->cmsg_level != SOL_IUCV)
1102 continue;
1103
1104 if (cmsg->cmsg_type & cmsg_done) {
1105 err = -EINVAL;
1106 goto out;
1107 }
1108 cmsg_done |= cmsg->cmsg_type;
1109
1110 switch (cmsg->cmsg_type) {
1111 case SCM_IUCV_TRGCLS:
1112 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1113 err = -EINVAL;
1114 goto out;
1115 }
1116
1117 /* set iucv message target class */
1118 memcpy(&txmsg.class,
1119 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1120
1121 break;
1122
1123 default:
1124 err = -EINVAL;
1125 goto out;
1126 }
1127 }
1128
1129 /* allocate one skb for each iucv message:
1130 * this is fine for SOCK_SEQPACKET (unless we want to support
1131 * segmented records using the MSG_EOR flag), but
1132 * for SOCK_STREAM we might want to improve it in future */
1133 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1134 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1135 linear = len;
1136 } else {
1137 if (len < PAGE_SIZE) {
1138 linear = len;
1139 } else {
1140 /* In nonlinear "classic" iucv skb,
1141 * reserve space for iucv_array
1142 */
1143 headroom = sizeof(struct iucv_array) *
1144 (MAX_SKB_FRAGS + 1);
1145 linear = PAGE_SIZE - headroom;
1146 }
1147 }
1148 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1149 noblock, &err, 0);
1150 if (!skb)
1151 goto out;
1152 if (headroom)
1153 skb_reserve(skb, headroom);
1154 skb_put(skb, linear);
1155 skb->len = len;
1156 skb->data_len = len - linear;
1157 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1158 if (err)
1159 goto fail;
1160
1161 /* wait if outstanding messages for iucv path has reached */
1162 timeo = sock_sndtimeo(sk, noblock);
1163 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1164 if (err)
1165 goto fail;
1166
1167 /* return -ECONNRESET if the socket is no longer connected */
1168 if (sk->sk_state != IUCV_CONNECTED) {
1169 err = -ECONNRESET;
1170 goto fail;
1171 }
1172
1173 /* increment and save iucv message tag for msg_completion cbk */
1174 txmsg.tag = iucv->send_tag++;
1175 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1176
1177 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1178 atomic_inc(&iucv->msg_sent);
1179 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1180 if (err) {
1181 atomic_dec(&iucv->msg_sent);
1182 goto out;
1183 }
1184 } else { /* Classic VM IUCV transport */
1185 skb_queue_tail(&iucv->send_skb_q, skb);
1186
1187 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1188 skb->len <= 7) {
1189 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1190
1191 /* on success: there is no message_complete callback */
1192 /* for an IPRMDATA msg; remove skb from send queue */
1193 if (err == 0) {
1194 skb_unlink(skb, &iucv->send_skb_q);
1195 kfree_skb(skb);
1196 }
1197
1198 /* this error should never happen since the */
1199 /* IUCV_IPRMDATA path flag is set... sever path */
1200 if (err == 0x15) {
1201 pr_iucv->path_sever(iucv->path, NULL);
1202 skb_unlink(skb, &iucv->send_skb_q);
1203 err = -EPIPE;
1204 goto fail;
1205 }
1206 } else if (skb_is_nonlinear(skb)) {
1207 struct iucv_array *iba = (struct iucv_array *)skb->head;
1208 int i;
1209
1210 /* skip iucv_array lying in the headroom */
1211 iba[0].address = (u32)(addr_t)skb->data;
1212 iba[0].length = (u32)skb_headlen(skb);
1213 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1214 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1215
1216 iba[i + 1].address =
1217 (u32)(addr_t)skb_frag_address(frag);
1218 iba[i + 1].length = (u32)skb_frag_size(frag);
1219 }
1220 err = pr_iucv->message_send(iucv->path, &txmsg,
1221 IUCV_IPBUFLST, 0,
1222 (void *)iba, skb->len);
1223 } else { /* non-IPRM Linear skb */
1224 err = pr_iucv->message_send(iucv->path, &txmsg,
1225 0, 0, (void *)skb->data, skb->len);
1226 }
1227 if (err) {
1228 if (err == 3) {
1229 user_id[8] = 0;
1230 memcpy(user_id, iucv->dst_user_id, 8);
1231 appl_id[8] = 0;
1232 memcpy(appl_id, iucv->dst_name, 8);
1233 pr_err(
1234 "Application %s on z/VM guest %s exceeds message limit\n",
1235 appl_id, user_id);
1236 err = -EAGAIN;
1237 } else {
1238 err = -EPIPE;
1239 }
1240 skb_unlink(skb, &iucv->send_skb_q);
1241 goto fail;
1242 }
1243 }
1244
1245 release_sock(sk);
1246 return len;
1247
1248 fail:
1249 kfree_skb(skb);
1250 out:
1251 release_sock(sk);
1252 return err;
1253 }
1254
1255 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1256 {
1257 size_t headroom, linear;
1258 struct sk_buff *skb;
1259 int err;
1260
1261 if (len < PAGE_SIZE) {
1262 headroom = 0;
1263 linear = len;
1264 } else {
1265 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1266 linear = PAGE_SIZE - headroom;
1267 }
1268 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1269 0, &err, GFP_ATOMIC | GFP_DMA);
1270 WARN_ONCE(!skb,
1271 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1272 len, err);
1273 if (skb) {
1274 if (headroom)
1275 skb_reserve(skb, headroom);
1276 skb_put(skb, linear);
1277 skb->len = len;
1278 skb->data_len = len - linear;
1279 }
1280 return skb;
1281 }
1282
1283 /* iucv_process_message() - Receive a single outstanding IUCV message
1284 *
1285 * Locking: must be called with message_q.lock held
1286 */
1287 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1288 struct iucv_path *path,
1289 struct iucv_message *msg)
1290 {
1291 int rc;
1292 unsigned int len;
1293
1294 len = iucv_msg_length(msg);
1295
1296 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1297 /* Note: the first 4 bytes are reserved for msg tag */
1298 IUCV_SKB_CB(skb)->class = msg->class;
1299
1300 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1301 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1302 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1303 skb->data = NULL;
1304 skb->len = 0;
1305 }
1306 } else {
1307 if (skb_is_nonlinear(skb)) {
1308 struct iucv_array *iba = (struct iucv_array *)skb->head;
1309 int i;
1310
1311 iba[0].address = (u32)(addr_t)skb->data;
1312 iba[0].length = (u32)skb_headlen(skb);
1313 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1314 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1315
1316 iba[i + 1].address =
1317 (u32)(addr_t)skb_frag_address(frag);
1318 iba[i + 1].length = (u32)skb_frag_size(frag);
1319 }
1320 rc = pr_iucv->message_receive(path, msg,
1321 IUCV_IPBUFLST,
1322 (void *)iba, len, NULL);
1323 } else {
1324 rc = pr_iucv->message_receive(path, msg,
1325 msg->flags & IUCV_IPRMDATA,
1326 skb->data, len, NULL);
1327 }
1328 if (rc) {
1329 kfree_skb(skb);
1330 return;
1331 }
1332 WARN_ON_ONCE(skb->len != len);
1333 }
1334
1335 IUCV_SKB_CB(skb)->offset = 0;
1336 if (sk_filter(sk, skb)) {
1337 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1338 kfree_skb(skb);
1339 return;
1340 }
1341 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1342 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1343 }
1344
1345 /* iucv_process_message_q() - Process outstanding IUCV messages
1346 *
1347 * Locking: must be called with message_q.lock held
1348 */
1349 static void iucv_process_message_q(struct sock *sk)
1350 {
1351 struct iucv_sock *iucv = iucv_sk(sk);
1352 struct sk_buff *skb;
1353 struct sock_msg_q *p, *n;
1354
1355 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1356 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1357 if (!skb)
1358 break;
1359 iucv_process_message(sk, skb, p->path, &p->msg);
1360 list_del(&p->list);
1361 kfree(p);
1362 if (!skb_queue_empty(&iucv->backlog_skb_q))
1363 break;
1364 }
1365 }
1366
1367 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1368 size_t len, int flags)
1369 {
1370 int noblock = flags & MSG_DONTWAIT;
1371 struct sock *sk = sock->sk;
1372 struct iucv_sock *iucv = iucv_sk(sk);
1373 unsigned int copied, rlen;
1374 struct sk_buff *skb, *rskb, *cskb;
1375 int err = 0;
1376 u32 offset;
1377
1378 if ((sk->sk_state == IUCV_DISCONN) &&
1379 skb_queue_empty(&iucv->backlog_skb_q) &&
1380 skb_queue_empty(&sk->sk_receive_queue) &&
1381 list_empty(&iucv->message_q.list))
1382 return 0;
1383
1384 if (flags & (MSG_OOB))
1385 return -EOPNOTSUPP;
1386
1387 /* receive/dequeue next skb:
1388 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1389 skb = skb_recv_datagram(sk, flags, noblock, &err);
1390 if (!skb) {
1391 if (sk->sk_shutdown & RCV_SHUTDOWN)
1392 return 0;
1393 return err;
1394 }
1395
1396 offset = IUCV_SKB_CB(skb)->offset;
1397 rlen = skb->len - offset; /* real length of skb */
1398 copied = min_t(unsigned int, rlen, len);
1399 if (!rlen)
1400 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1401
1402 cskb = skb;
1403 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1404 if (!(flags & MSG_PEEK))
1405 skb_queue_head(&sk->sk_receive_queue, skb);
1406 return -EFAULT;
1407 }
1408
1409 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1410 if (sk->sk_type == SOCK_SEQPACKET) {
1411 if (copied < rlen)
1412 msg->msg_flags |= MSG_TRUNC;
1413 /* each iucv message contains a complete record */
1414 msg->msg_flags |= MSG_EOR;
1415 }
1416
1417 /* create control message to store iucv msg target class:
1418 * get the trgcls from the control buffer of the skb due to
1419 * fragmentation of original iucv message. */
1420 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1421 sizeof(IUCV_SKB_CB(skb)->class),
1422 (void *)&IUCV_SKB_CB(skb)->class);
1423 if (err) {
1424 if (!(flags & MSG_PEEK))
1425 skb_queue_head(&sk->sk_receive_queue, skb);
1426 return err;
1427 }
1428
1429 /* Mark read part of skb as used */
1430 if (!(flags & MSG_PEEK)) {
1431
1432 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1433 if (sk->sk_type == SOCK_STREAM) {
1434 if (copied < rlen) {
1435 IUCV_SKB_CB(skb)->offset = offset + copied;
1436 skb_queue_head(&sk->sk_receive_queue, skb);
1437 goto done;
1438 }
1439 }
1440
1441 kfree_skb(skb);
1442 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1443 atomic_inc(&iucv->msg_recv);
1444 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1445 WARN_ON(1);
1446 iucv_sock_close(sk);
1447 return -EFAULT;
1448 }
1449 }
1450
1451 /* Queue backlog skbs */
1452 spin_lock_bh(&iucv->message_q.lock);
1453 rskb = skb_dequeue(&iucv->backlog_skb_q);
1454 while (rskb) {
1455 IUCV_SKB_CB(rskb)->offset = 0;
1456 if (__sock_queue_rcv_skb(sk, rskb)) {
1457 /* handle rcv queue full */
1458 skb_queue_head(&iucv->backlog_skb_q,
1459 rskb);
1460 break;
1461 }
1462 rskb = skb_dequeue(&iucv->backlog_skb_q);
1463 }
1464 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1465 if (!list_empty(&iucv->message_q.list))
1466 iucv_process_message_q(sk);
1467 if (atomic_read(&iucv->msg_recv) >=
1468 iucv->msglimit / 2) {
1469 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1470 if (err) {
1471 sk->sk_state = IUCV_DISCONN;
1472 sk->sk_state_change(sk);
1473 }
1474 }
1475 }
1476 spin_unlock_bh(&iucv->message_q.lock);
1477 }
1478
1479 done:
1480 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1481 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1482 copied = rlen;
1483
1484 return copied;
1485 }
1486
1487 static inline __poll_t iucv_accept_poll(struct sock *parent)
1488 {
1489 struct iucv_sock *isk, *n;
1490 struct sock *sk;
1491
1492 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1493 sk = (struct sock *) isk;
1494
1495 if (sk->sk_state == IUCV_CONNECTED)
1496 return EPOLLIN | EPOLLRDNORM;
1497 }
1498
1499 return 0;
1500 }
1501
1502 __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1503 poll_table *wait)
1504 {
1505 struct sock *sk = sock->sk;
1506 __poll_t mask = 0;
1507
1508 sock_poll_wait(file, wait);
1509
1510 if (sk->sk_state == IUCV_LISTEN)
1511 return iucv_accept_poll(sk);
1512
1513 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1514 mask |= EPOLLERR |
1515 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1516
1517 if (sk->sk_shutdown & RCV_SHUTDOWN)
1518 mask |= EPOLLRDHUP;
1519
1520 if (sk->sk_shutdown == SHUTDOWN_MASK)
1521 mask |= EPOLLHUP;
1522
1523 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1524 (sk->sk_shutdown & RCV_SHUTDOWN))
1525 mask |= EPOLLIN | EPOLLRDNORM;
1526
1527 if (sk->sk_state == IUCV_CLOSED)
1528 mask |= EPOLLHUP;
1529
1530 if (sk->sk_state == IUCV_DISCONN)
1531 mask |= EPOLLIN;
1532
1533 if (sock_writeable(sk) && iucv_below_msglim(sk))
1534 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1535 else
1536 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1537
1538 return mask;
1539 }
1540
1541 static int iucv_sock_shutdown(struct socket *sock, int how)
1542 {
1543 struct sock *sk = sock->sk;
1544 struct iucv_sock *iucv = iucv_sk(sk);
1545 struct iucv_message txmsg;
1546 int err = 0;
1547
1548 how++;
1549
1550 if ((how & ~SHUTDOWN_MASK) || !how)
1551 return -EINVAL;
1552
1553 lock_sock(sk);
1554 switch (sk->sk_state) {
1555 case IUCV_LISTEN:
1556 case IUCV_DISCONN:
1557 case IUCV_CLOSING:
1558 case IUCV_CLOSED:
1559 err = -ENOTCONN;
1560 goto fail;
1561 default:
1562 break;
1563 }
1564
1565 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1566 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1567 txmsg.class = 0;
1568 txmsg.tag = 0;
1569 err = pr_iucv->message_send(iucv->path, &txmsg,
1570 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1571 if (err) {
1572 switch (err) {
1573 case 1:
1574 err = -ENOTCONN;
1575 break;
1576 case 2:
1577 err = -ECONNRESET;
1578 break;
1579 default:
1580 err = -ENOTCONN;
1581 break;
1582 }
1583 }
1584 } else
1585 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1586 }
1587
1588 sk->sk_shutdown |= how;
1589 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1590 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1591 iucv->path) {
1592 err = pr_iucv->path_quiesce(iucv->path, NULL);
1593 if (err)
1594 err = -ENOTCONN;
1595 /* skb_queue_purge(&sk->sk_receive_queue); */
1596 }
1597 skb_queue_purge(&sk->sk_receive_queue);
1598 }
1599
1600 /* Wake up anyone sleeping in poll */
1601 sk->sk_state_change(sk);
1602
1603 fail:
1604 release_sock(sk);
1605 return err;
1606 }
1607
1608 static int iucv_sock_release(struct socket *sock)
1609 {
1610 struct sock *sk = sock->sk;
1611 int err = 0;
1612
1613 if (!sk)
1614 return 0;
1615
1616 iucv_sock_close(sk);
1617
1618 sock_orphan(sk);
1619 iucv_sock_kill(sk);
1620 return err;
1621 }
1622
1623 /* getsockopt and setsockopt */
1624 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1625 char __user *optval, unsigned int optlen)
1626 {
1627 struct sock *sk = sock->sk;
1628 struct iucv_sock *iucv = iucv_sk(sk);
1629 int val;
1630 int rc;
1631
1632 if (level != SOL_IUCV)
1633 return -ENOPROTOOPT;
1634
1635 if (optlen < sizeof(int))
1636 return -EINVAL;
1637
1638 if (get_user(val, (int __user *) optval))
1639 return -EFAULT;
1640
1641 rc = 0;
1642
1643 lock_sock(sk);
1644 switch (optname) {
1645 case SO_IPRMDATA_MSG:
1646 if (val)
1647 iucv->flags |= IUCV_IPRMDATA;
1648 else
1649 iucv->flags &= ~IUCV_IPRMDATA;
1650 break;
1651 case SO_MSGLIMIT:
1652 switch (sk->sk_state) {
1653 case IUCV_OPEN:
1654 case IUCV_BOUND:
1655 if (val < 1 || val > (u16)(~0))
1656 rc = -EINVAL;
1657 else
1658 iucv->msglimit = val;
1659 break;
1660 default:
1661 rc = -EINVAL;
1662 break;
1663 }
1664 break;
1665 default:
1666 rc = -ENOPROTOOPT;
1667 break;
1668 }
1669 release_sock(sk);
1670
1671 return rc;
1672 }
1673
1674 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1675 char __user *optval, int __user *optlen)
1676 {
1677 struct sock *sk = sock->sk;
1678 struct iucv_sock *iucv = iucv_sk(sk);
1679 unsigned int val;
1680 int len;
1681
1682 if (level != SOL_IUCV)
1683 return -ENOPROTOOPT;
1684
1685 if (get_user(len, optlen))
1686 return -EFAULT;
1687
1688 if (len < 0)
1689 return -EINVAL;
1690
1691 len = min_t(unsigned int, len, sizeof(int));
1692
1693 switch (optname) {
1694 case SO_IPRMDATA_MSG:
1695 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1696 break;
1697 case SO_MSGLIMIT:
1698 lock_sock(sk);
1699 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1700 : iucv->msglimit; /* default */
1701 release_sock(sk);
1702 break;
1703 case SO_MSGSIZE:
1704 if (sk->sk_state == IUCV_OPEN)
1705 return -EBADFD;
1706 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1707 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1708 0x7fffffff;
1709 break;
1710 default:
1711 return -ENOPROTOOPT;
1712 }
1713
1714 if (put_user(len, optlen))
1715 return -EFAULT;
1716 if (copy_to_user(optval, &val, len))
1717 return -EFAULT;
1718
1719 return 0;
1720 }
1721
1722
1723 /* Callback wrappers - called from iucv base support */
1724 static int iucv_callback_connreq(struct iucv_path *path,
1725 u8 ipvmid[8], u8 ipuser[16])
1726 {
1727 unsigned char user_data[16];
1728 unsigned char nuser_data[16];
1729 unsigned char src_name[8];
1730 struct sock *sk, *nsk;
1731 struct iucv_sock *iucv, *niucv;
1732 int err;
1733
1734 memcpy(src_name, ipuser, 8);
1735 EBCASC(src_name, 8);
1736 /* Find out if this path belongs to af_iucv. */
1737 read_lock(&iucv_sk_list.lock);
1738 iucv = NULL;
1739 sk = NULL;
1740 sk_for_each(sk, &iucv_sk_list.head)
1741 if (sk->sk_state == IUCV_LISTEN &&
1742 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1743 /*
1744 * Found a listening socket with
1745 * src_name == ipuser[0-7].
1746 */
1747 iucv = iucv_sk(sk);
1748 break;
1749 }
1750 read_unlock(&iucv_sk_list.lock);
1751 if (!iucv)
1752 /* No socket found, not one of our paths. */
1753 return -EINVAL;
1754
1755 bh_lock_sock(sk);
1756
1757 /* Check if parent socket is listening */
1758 low_nmcpy(user_data, iucv->src_name);
1759 high_nmcpy(user_data, iucv->dst_name);
1760 ASCEBC(user_data, sizeof(user_data));
1761 if (sk->sk_state != IUCV_LISTEN) {
1762 err = pr_iucv->path_sever(path, user_data);
1763 iucv_path_free(path);
1764 goto fail;
1765 }
1766
1767 /* Check for backlog size */
1768 if (sk_acceptq_is_full(sk)) {
1769 err = pr_iucv->path_sever(path, user_data);
1770 iucv_path_free(path);
1771 goto fail;
1772 }
1773
1774 /* Create the new socket */
1775 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1776 if (!nsk) {
1777 err = pr_iucv->path_sever(path, user_data);
1778 iucv_path_free(path);
1779 goto fail;
1780 }
1781
1782 niucv = iucv_sk(nsk);
1783 iucv_sock_init(nsk, sk);
1784
1785 /* Set the new iucv_sock */
1786 memcpy(niucv->dst_name, ipuser + 8, 8);
1787 EBCASC(niucv->dst_name, 8);
1788 memcpy(niucv->dst_user_id, ipvmid, 8);
1789 memcpy(niucv->src_name, iucv->src_name, 8);
1790 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1791 niucv->path = path;
1792
1793 /* Call iucv_accept */
1794 high_nmcpy(nuser_data, ipuser + 8);
1795 memcpy(nuser_data + 8, niucv->src_name, 8);
1796 ASCEBC(nuser_data + 8, 8);
1797
1798 /* set message limit for path based on msglimit of accepting socket */
1799 niucv->msglimit = iucv->msglimit;
1800 path->msglim = iucv->msglimit;
1801 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1802 if (err) {
1803 iucv_sever_path(nsk, 1);
1804 iucv_sock_kill(nsk);
1805 goto fail;
1806 }
1807
1808 iucv_accept_enqueue(sk, nsk);
1809
1810 /* Wake up accept */
1811 nsk->sk_state = IUCV_CONNECTED;
1812 sk->sk_data_ready(sk);
1813 err = 0;
1814 fail:
1815 bh_unlock_sock(sk);
1816 return 0;
1817 }
1818
1819 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1820 {
1821 struct sock *sk = path->private;
1822
1823 sk->sk_state = IUCV_CONNECTED;
1824 sk->sk_state_change(sk);
1825 }
1826
1827 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1828 {
1829 struct sock *sk = path->private;
1830 struct iucv_sock *iucv = iucv_sk(sk);
1831 struct sk_buff *skb;
1832 struct sock_msg_q *save_msg;
1833 int len;
1834
1835 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1836 pr_iucv->message_reject(path, msg);
1837 return;
1838 }
1839
1840 spin_lock(&iucv->message_q.lock);
1841
1842 if (!list_empty(&iucv->message_q.list) ||
1843 !skb_queue_empty(&iucv->backlog_skb_q))
1844 goto save_message;
1845
1846 len = atomic_read(&sk->sk_rmem_alloc);
1847 len += SKB_TRUESIZE(iucv_msg_length(msg));
1848 if (len > sk->sk_rcvbuf)
1849 goto save_message;
1850
1851 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1852 if (!skb)
1853 goto save_message;
1854
1855 iucv_process_message(sk, skb, path, msg);
1856 goto out_unlock;
1857
1858 save_message:
1859 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1860 if (!save_msg)
1861 goto out_unlock;
1862 save_msg->path = path;
1863 save_msg->msg = *msg;
1864
1865 list_add_tail(&save_msg->list, &iucv->message_q.list);
1866
1867 out_unlock:
1868 spin_unlock(&iucv->message_q.lock);
1869 }
1870
1871 static void iucv_callback_txdone(struct iucv_path *path,
1872 struct iucv_message *msg)
1873 {
1874 struct sock *sk = path->private;
1875 struct sk_buff *this = NULL;
1876 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1877 struct sk_buff *list_skb = list->next;
1878 unsigned long flags;
1879
1880 bh_lock_sock(sk);
1881 if (!skb_queue_empty(list)) {
1882 spin_lock_irqsave(&list->lock, flags);
1883
1884 while (list_skb != (struct sk_buff *)list) {
1885 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1886 this = list_skb;
1887 break;
1888 }
1889 list_skb = list_skb->next;
1890 }
1891 if (this)
1892 __skb_unlink(this, list);
1893
1894 spin_unlock_irqrestore(&list->lock, flags);
1895
1896 if (this) {
1897 kfree_skb(this);
1898 /* wake up any process waiting for sending */
1899 iucv_sock_wake_msglim(sk);
1900 }
1901 }
1902
1903 if (sk->sk_state == IUCV_CLOSING) {
1904 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1905 sk->sk_state = IUCV_CLOSED;
1906 sk->sk_state_change(sk);
1907 }
1908 }
1909 bh_unlock_sock(sk);
1910
1911 }
1912
1913 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1914 {
1915 struct sock *sk = path->private;
1916
1917 if (sk->sk_state == IUCV_CLOSED)
1918 return;
1919
1920 bh_lock_sock(sk);
1921 iucv_sever_path(sk, 1);
1922 sk->sk_state = IUCV_DISCONN;
1923
1924 sk->sk_state_change(sk);
1925 bh_unlock_sock(sk);
1926 }
1927
1928 /* called if the other communication side shuts down its RECV direction;
1929 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1930 */
1931 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1932 {
1933 struct sock *sk = path->private;
1934
1935 bh_lock_sock(sk);
1936 if (sk->sk_state != IUCV_CLOSED) {
1937 sk->sk_shutdown |= SEND_SHUTDOWN;
1938 sk->sk_state_change(sk);
1939 }
1940 bh_unlock_sock(sk);
1941 }
1942
1943 /***************** HiperSockets transport callbacks ********************/
1944 static void afiucv_swap_src_dest(struct sk_buff *skb)
1945 {
1946 struct af_iucv_trans_hdr *trans_hdr =
1947 (struct af_iucv_trans_hdr *)skb->data;
1948 char tmpID[8];
1949 char tmpName[8];
1950
1951 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1952 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1953 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1954 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1955 memcpy(tmpID, trans_hdr->srcUserID, 8);
1956 memcpy(tmpName, trans_hdr->srcAppName, 8);
1957 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1958 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1959 memcpy(trans_hdr->destUserID, tmpID, 8);
1960 memcpy(trans_hdr->destAppName, tmpName, 8);
1961 skb_push(skb, ETH_HLEN);
1962 memset(skb->data, 0, ETH_HLEN);
1963 }
1964
1965 /**
1966 * afiucv_hs_callback_syn - react on received SYN
1967 **/
1968 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1969 {
1970 struct sock *nsk;
1971 struct iucv_sock *iucv, *niucv;
1972 struct af_iucv_trans_hdr *trans_hdr;
1973 int err;
1974
1975 iucv = iucv_sk(sk);
1976 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1977 if (!iucv) {
1978 /* no sock - connection refused */
1979 afiucv_swap_src_dest(skb);
1980 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1981 err = dev_queue_xmit(skb);
1982 goto out;
1983 }
1984
1985 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1986 bh_lock_sock(sk);
1987 if ((sk->sk_state != IUCV_LISTEN) ||
1988 sk_acceptq_is_full(sk) ||
1989 !nsk) {
1990 /* error on server socket - connection refused */
1991 afiucv_swap_src_dest(skb);
1992 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1993 err = dev_queue_xmit(skb);
1994 iucv_sock_kill(nsk);
1995 bh_unlock_sock(sk);
1996 goto out;
1997 }
1998
1999 niucv = iucv_sk(nsk);
2000 iucv_sock_init(nsk, sk);
2001 niucv->transport = AF_IUCV_TRANS_HIPER;
2002 niucv->msglimit = iucv->msglimit;
2003 if (!trans_hdr->window)
2004 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
2005 else
2006 niucv->msglimit_peer = trans_hdr->window;
2007 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
2008 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2009 memcpy(niucv->src_name, iucv->src_name, 8);
2010 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2011 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2012 niucv->hs_dev = iucv->hs_dev;
2013 dev_hold(niucv->hs_dev);
2014 afiucv_swap_src_dest(skb);
2015 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2016 trans_hdr->window = niucv->msglimit;
2017 /* if receiver acks the xmit connection is established */
2018 err = dev_queue_xmit(skb);
2019 if (!err) {
2020 iucv_accept_enqueue(sk, nsk);
2021 nsk->sk_state = IUCV_CONNECTED;
2022 sk->sk_data_ready(sk);
2023 } else
2024 iucv_sock_kill(nsk);
2025 bh_unlock_sock(sk);
2026
2027 out:
2028 return NET_RX_SUCCESS;
2029 }
2030
2031 /**
2032 * afiucv_hs_callback_synack() - react on received SYN-ACK
2033 **/
2034 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2035 {
2036 struct iucv_sock *iucv = iucv_sk(sk);
2037 struct af_iucv_trans_hdr *trans_hdr =
2038 (struct af_iucv_trans_hdr *)skb->data;
2039
2040 if (!iucv)
2041 goto out;
2042 if (sk->sk_state != IUCV_BOUND)
2043 goto out;
2044 bh_lock_sock(sk);
2045 iucv->msglimit_peer = trans_hdr->window;
2046 sk->sk_state = IUCV_CONNECTED;
2047 sk->sk_state_change(sk);
2048 bh_unlock_sock(sk);
2049 out:
2050 kfree_skb(skb);
2051 return NET_RX_SUCCESS;
2052 }
2053
2054 /**
2055 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2056 **/
2057 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2058 {
2059 struct iucv_sock *iucv = iucv_sk(sk);
2060
2061 if (!iucv)
2062 goto out;
2063 if (sk->sk_state != IUCV_BOUND)
2064 goto out;
2065 bh_lock_sock(sk);
2066 sk->sk_state = IUCV_DISCONN;
2067 sk->sk_state_change(sk);
2068 bh_unlock_sock(sk);
2069 out:
2070 kfree_skb(skb);
2071 return NET_RX_SUCCESS;
2072 }
2073
2074 /**
2075 * afiucv_hs_callback_fin() - react on received FIN
2076 **/
2077 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2078 {
2079 struct iucv_sock *iucv = iucv_sk(sk);
2080
2081 /* other end of connection closed */
2082 if (!iucv)
2083 goto out;
2084 bh_lock_sock(sk);
2085 if (sk->sk_state == IUCV_CONNECTED) {
2086 sk->sk_state = IUCV_DISCONN;
2087 sk->sk_state_change(sk);
2088 }
2089 bh_unlock_sock(sk);
2090 out:
2091 kfree_skb(skb);
2092 return NET_RX_SUCCESS;
2093 }
2094
2095 /**
2096 * afiucv_hs_callback_win() - react on received WIN
2097 **/
2098 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2099 {
2100 struct iucv_sock *iucv = iucv_sk(sk);
2101 struct af_iucv_trans_hdr *trans_hdr =
2102 (struct af_iucv_trans_hdr *)skb->data;
2103
2104 if (!iucv)
2105 return NET_RX_SUCCESS;
2106
2107 if (sk->sk_state != IUCV_CONNECTED)
2108 return NET_RX_SUCCESS;
2109
2110 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2111 iucv_sock_wake_msglim(sk);
2112 return NET_RX_SUCCESS;
2113 }
2114
2115 /**
2116 * afiucv_hs_callback_rx() - react on received data
2117 **/
2118 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2119 {
2120 struct iucv_sock *iucv = iucv_sk(sk);
2121
2122 if (!iucv) {
2123 kfree_skb(skb);
2124 return NET_RX_SUCCESS;
2125 }
2126
2127 if (sk->sk_state != IUCV_CONNECTED) {
2128 kfree_skb(skb);
2129 return NET_RX_SUCCESS;
2130 }
2131
2132 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2133 kfree_skb(skb);
2134 return NET_RX_SUCCESS;
2135 }
2136
2137 /* write stuff from iucv_msg to skb cb */
2138 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2139 skb_reset_transport_header(skb);
2140 skb_reset_network_header(skb);
2141 IUCV_SKB_CB(skb)->offset = 0;
2142 if (sk_filter(sk, skb)) {
2143 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2144 kfree_skb(skb);
2145 return NET_RX_SUCCESS;
2146 }
2147
2148 spin_lock(&iucv->message_q.lock);
2149 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2150 if (__sock_queue_rcv_skb(sk, skb))
2151 /* handle rcv queue full */
2152 skb_queue_tail(&iucv->backlog_skb_q, skb);
2153 } else
2154 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2155 spin_unlock(&iucv->message_q.lock);
2156 return NET_RX_SUCCESS;
2157 }
2158
2159 /**
2160 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2161 * transport
2162 * called from netif RX softirq
2163 **/
2164 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2165 struct packet_type *pt, struct net_device *orig_dev)
2166 {
2167 struct sock *sk;
2168 struct iucv_sock *iucv;
2169 struct af_iucv_trans_hdr *trans_hdr;
2170 int err = NET_RX_SUCCESS;
2171 char nullstring[8];
2172
2173 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2174 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2175 (int)skb->len,
2176 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2177 kfree_skb(skb);
2178 return NET_RX_SUCCESS;
2179 }
2180 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2181 if (skb_linearize(skb)) {
2182 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2183 (int)skb->len);
2184 kfree_skb(skb);
2185 return NET_RX_SUCCESS;
2186 }
2187 skb_pull(skb, ETH_HLEN);
2188 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2189 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2190 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2191 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2192 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2193 memset(nullstring, 0, sizeof(nullstring));
2194 iucv = NULL;
2195 sk = NULL;
2196 read_lock(&iucv_sk_list.lock);
2197 sk_for_each(sk, &iucv_sk_list.head) {
2198 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2199 if ((!memcmp(&iucv_sk(sk)->src_name,
2200 trans_hdr->destAppName, 8)) &&
2201 (!memcmp(&iucv_sk(sk)->src_user_id,
2202 trans_hdr->destUserID, 8)) &&
2203 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2204 (!memcmp(&iucv_sk(sk)->dst_user_id,
2205 nullstring, 8))) {
2206 iucv = iucv_sk(sk);
2207 break;
2208 }
2209 } else {
2210 if ((!memcmp(&iucv_sk(sk)->src_name,
2211 trans_hdr->destAppName, 8)) &&
2212 (!memcmp(&iucv_sk(sk)->src_user_id,
2213 trans_hdr->destUserID, 8)) &&
2214 (!memcmp(&iucv_sk(sk)->dst_name,
2215 trans_hdr->srcAppName, 8)) &&
2216 (!memcmp(&iucv_sk(sk)->dst_user_id,
2217 trans_hdr->srcUserID, 8))) {
2218 iucv = iucv_sk(sk);
2219 break;
2220 }
2221 }
2222 }
2223 read_unlock(&iucv_sk_list.lock);
2224 if (!iucv)
2225 sk = NULL;
2226
2227 /* no sock
2228 how should we send with no sock
2229 1) send without sock no send rc checking?
2230 2) introduce default sock to handle this cases
2231
2232 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2233 data -> send FIN
2234 SYN|ACK, SYN|FIN, FIN -> no action? */
2235
2236 switch (trans_hdr->flags) {
2237 case AF_IUCV_FLAG_SYN:
2238 /* connect request */
2239 err = afiucv_hs_callback_syn(sk, skb);
2240 break;
2241 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2242 /* connect request confirmed */
2243 err = afiucv_hs_callback_synack(sk, skb);
2244 break;
2245 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2246 /* connect request refused */
2247 err = afiucv_hs_callback_synfin(sk, skb);
2248 break;
2249 case (AF_IUCV_FLAG_FIN):
2250 /* close request */
2251 err = afiucv_hs_callback_fin(sk, skb);
2252 break;
2253 case (AF_IUCV_FLAG_WIN):
2254 err = afiucv_hs_callback_win(sk, skb);
2255 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2256 kfree_skb(skb);
2257 break;
2258 }
2259 /* fall through and receive non-zero length data */
2260 case (AF_IUCV_FLAG_SHT):
2261 /* shutdown request */
2262 /* fall through and receive zero length data */
2263 case 0:
2264 /* plain data frame */
2265 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2266 err = afiucv_hs_callback_rx(sk, skb);
2267 break;
2268 default:
2269 kfree_skb(skb);
2270 }
2271
2272 return err;
2273 }
2274
2275 /**
2276 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2277 * transport
2278 **/
2279 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2280 enum iucv_tx_notify n)
2281 {
2282 struct sock *isk = skb->sk;
2283 struct sock *sk = NULL;
2284 struct iucv_sock *iucv = NULL;
2285 struct sk_buff_head *list;
2286 struct sk_buff *list_skb;
2287 struct sk_buff *nskb;
2288 unsigned long flags;
2289
2290 read_lock_irqsave(&iucv_sk_list.lock, flags);
2291 sk_for_each(sk, &iucv_sk_list.head)
2292 if (sk == isk) {
2293 iucv = iucv_sk(sk);
2294 break;
2295 }
2296 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2297
2298 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2299 return;
2300
2301 list = &iucv->send_skb_q;
2302 spin_lock_irqsave(&list->lock, flags);
2303 if (skb_queue_empty(list))
2304 goto out_unlock;
2305 list_skb = list->next;
2306 nskb = list_skb->next;
2307 while (list_skb != (struct sk_buff *)list) {
2308 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2309 switch (n) {
2310 case TX_NOTIFY_OK:
2311 __skb_unlink(list_skb, list);
2312 kfree_skb(list_skb);
2313 iucv_sock_wake_msglim(sk);
2314 break;
2315 case TX_NOTIFY_PENDING:
2316 atomic_inc(&iucv->pendings);
2317 break;
2318 case TX_NOTIFY_DELAYED_OK:
2319 __skb_unlink(list_skb, list);
2320 atomic_dec(&iucv->pendings);
2321 if (atomic_read(&iucv->pendings) <= 0)
2322 iucv_sock_wake_msglim(sk);
2323 kfree_skb(list_skb);
2324 break;
2325 case TX_NOTIFY_UNREACHABLE:
2326 case TX_NOTIFY_DELAYED_UNREACHABLE:
2327 case TX_NOTIFY_TPQFULL: /* not yet used */
2328 case TX_NOTIFY_GENERALERROR:
2329 case TX_NOTIFY_DELAYED_GENERALERROR:
2330 __skb_unlink(list_skb, list);
2331 kfree_skb(list_skb);
2332 if (sk->sk_state == IUCV_CONNECTED) {
2333 sk->sk_state = IUCV_DISCONN;
2334 sk->sk_state_change(sk);
2335 }
2336 break;
2337 }
2338 break;
2339 }
2340 list_skb = nskb;
2341 nskb = nskb->next;
2342 }
2343 out_unlock:
2344 spin_unlock_irqrestore(&list->lock, flags);
2345
2346 if (sk->sk_state == IUCV_CLOSING) {
2347 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2348 sk->sk_state = IUCV_CLOSED;
2349 sk->sk_state_change(sk);
2350 }
2351 }
2352
2353 }
2354
2355 /*
2356 * afiucv_netdev_event: handle netdev notifier chain events
2357 */
2358 static int afiucv_netdev_event(struct notifier_block *this,
2359 unsigned long event, void *ptr)
2360 {
2361 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2362 struct sock *sk;
2363 struct iucv_sock *iucv;
2364
2365 switch (event) {
2366 case NETDEV_REBOOT:
2367 case NETDEV_GOING_DOWN:
2368 sk_for_each(sk, &iucv_sk_list.head) {
2369 iucv = iucv_sk(sk);
2370 if ((iucv->hs_dev == event_dev) &&
2371 (sk->sk_state == IUCV_CONNECTED)) {
2372 if (event == NETDEV_GOING_DOWN)
2373 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2374 sk->sk_state = IUCV_DISCONN;
2375 sk->sk_state_change(sk);
2376 }
2377 }
2378 break;
2379 case NETDEV_DOWN:
2380 case NETDEV_UNREGISTER:
2381 default:
2382 break;
2383 }
2384 return NOTIFY_DONE;
2385 }
2386
2387 static struct notifier_block afiucv_netdev_notifier = {
2388 .notifier_call = afiucv_netdev_event,
2389 };
2390
2391 static const struct proto_ops iucv_sock_ops = {
2392 .family = PF_IUCV,
2393 .owner = THIS_MODULE,
2394 .release = iucv_sock_release,
2395 .bind = iucv_sock_bind,
2396 .connect = iucv_sock_connect,
2397 .listen = iucv_sock_listen,
2398 .accept = iucv_sock_accept,
2399 .getname = iucv_sock_getname,
2400 .sendmsg = iucv_sock_sendmsg,
2401 .recvmsg = iucv_sock_recvmsg,
2402 .poll = iucv_sock_poll,
2403 .ioctl = sock_no_ioctl,
2404 .mmap = sock_no_mmap,
2405 .socketpair = sock_no_socketpair,
2406 .shutdown = iucv_sock_shutdown,
2407 .setsockopt = iucv_sock_setsockopt,
2408 .getsockopt = iucv_sock_getsockopt,
2409 };
2410
2411 static const struct net_proto_family iucv_sock_family_ops = {
2412 .family = AF_IUCV,
2413 .owner = THIS_MODULE,
2414 .create = iucv_sock_create,
2415 };
2416
2417 static struct packet_type iucv_packet_type = {
2418 .type = cpu_to_be16(ETH_P_AF_IUCV),
2419 .func = afiucv_hs_rcv,
2420 };
2421
2422 static int afiucv_iucv_init(void)
2423 {
2424 int err;
2425
2426 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2427 if (err)
2428 goto out;
2429 /* establish dummy device */
2430 af_iucv_driver.bus = pr_iucv->bus;
2431 err = driver_register(&af_iucv_driver);
2432 if (err)
2433 goto out_iucv;
2434 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2435 if (!af_iucv_dev) {
2436 err = -ENOMEM;
2437 goto out_driver;
2438 }
2439 dev_set_name(af_iucv_dev, "af_iucv");
2440 af_iucv_dev->bus = pr_iucv->bus;
2441 af_iucv_dev->parent = pr_iucv->root;
2442 af_iucv_dev->release = (void (*)(struct device *))kfree;
2443 af_iucv_dev->driver = &af_iucv_driver;
2444 err = device_register(af_iucv_dev);
2445 if (err)
2446 goto out_iucv_dev;
2447 return 0;
2448
2449 out_iucv_dev:
2450 put_device(af_iucv_dev);
2451 out_driver:
2452 driver_unregister(&af_iucv_driver);
2453 out_iucv:
2454 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2455 out:
2456 return err;
2457 }
2458
2459 static int __init afiucv_init(void)
2460 {
2461 int err;
2462
2463 if (MACHINE_IS_VM) {
2464 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2465 if (unlikely(err)) {
2466 WARN_ON(err);
2467 err = -EPROTONOSUPPORT;
2468 goto out;
2469 }
2470
2471 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2472 if (!pr_iucv) {
2473 printk(KERN_WARNING "iucv_if lookup failed\n");
2474 memset(&iucv_userid, 0, sizeof(iucv_userid));
2475 }
2476 } else {
2477 memset(&iucv_userid, 0, sizeof(iucv_userid));
2478 pr_iucv = NULL;
2479 }
2480
2481 err = proto_register(&iucv_proto, 0);
2482 if (err)
2483 goto out;
2484 err = sock_register(&iucv_sock_family_ops);
2485 if (err)
2486 goto out_proto;
2487
2488 if (pr_iucv) {
2489 err = afiucv_iucv_init();
2490 if (err)
2491 goto out_sock;
2492 } else
2493 register_netdevice_notifier(&afiucv_netdev_notifier);
2494 dev_add_pack(&iucv_packet_type);
2495 return 0;
2496
2497 out_sock:
2498 sock_unregister(PF_IUCV);
2499 out_proto:
2500 proto_unregister(&iucv_proto);
2501 out:
2502 if (pr_iucv)
2503 symbol_put(iucv_if);
2504 return err;
2505 }
2506
2507 static void __exit afiucv_exit(void)
2508 {
2509 if (pr_iucv) {
2510 device_unregister(af_iucv_dev);
2511 driver_unregister(&af_iucv_driver);
2512 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2513 symbol_put(iucv_if);
2514 } else
2515 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2516 dev_remove_pack(&iucv_packet_type);
2517 sock_unregister(PF_IUCV);
2518 proto_unregister(&iucv_proto);
2519 }
2520
2521 module_init(afiucv_init);
2522 module_exit(afiucv_exit);
2523
2524 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2525 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2526 MODULE_VERSION(VERSION);
2527 MODULE_LICENSE("GPL");
2528 MODULE_ALIAS_NETPROTO(PF_IUCV);
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