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[mirror_ubuntu-bionic-kernel.git] / net / iucv / af_iucv.c
1 /*
2 * IUCV protocol stack for Linux on zSeries
3 *
4 * Copyright IBM Corp. 2006, 2009
5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
25 #include <net/sock.h>
26 #include <asm/ebcdic.h>
27 #include <asm/cpcmd.h>
28 #include <linux/kmod.h>
29
30 #include <net/iucv/af_iucv.h>
31
32 #define VERSION "1.2"
33
34 static char iucv_userid[80];
35
36 static const struct proto_ops iucv_sock_ops;
37
38 static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42 };
43
44 static struct iucv_interface *pr_iucv;
45
46 /* special AF_IUCV IPRM messages */
47 static const u8 iprm_shutdown[8] =
48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
49
50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
51
52 #define __iucv_sock_wait(sk, condition, timeo, ret) \
53 do { \
54 DEFINE_WAIT(__wait); \
55 long __timeo = timeo; \
56 ret = 0; \
57 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
58 while (!(condition)) { \
59 if (!__timeo) { \
60 ret = -EAGAIN; \
61 break; \
62 } \
63 if (signal_pending(current)) { \
64 ret = sock_intr_errno(__timeo); \
65 break; \
66 } \
67 release_sock(sk); \
68 __timeo = schedule_timeout(__timeo); \
69 lock_sock(sk); \
70 ret = sock_error(sk); \
71 if (ret) \
72 break; \
73 } \
74 finish_wait(sk_sleep(sk), &__wait); \
75 } while (0)
76
77 #define iucv_sock_wait(sk, condition, timeo) \
78 ({ \
79 int __ret = 0; \
80 if (!(condition)) \
81 __iucv_sock_wait(sk, condition, timeo, __ret); \
82 __ret; \
83 })
84
85 static void iucv_sock_kill(struct sock *sk);
86 static void iucv_sock_close(struct sock *sk);
87 static void iucv_sever_path(struct sock *, int);
88
89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
90 struct packet_type *pt, struct net_device *orig_dev);
91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
92 struct sk_buff *skb, u8 flags);
93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
94
95 /* Call Back functions */
96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
99 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
100 u8 ipuser[16]);
101 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
103
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
107 };
108
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
116 };
117
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120 memcpy(dst, src, 8);
121 }
122
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(&dst[8], src, 8);
126 }
127
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133 return 0;
134 }
135
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142
143 /**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151 struct iucv_sock *iucv;
152 struct sock *sk;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 switch (sk->sk_state) {
162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
165 iucv_sever_path(sk, 0);
166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179 }
180
181 /**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189 struct sock *sk;
190
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213 }
214
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221 };
222
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
226 .bus = NULL,
227 .pm = &afiucv_pm_ops,
228 };
229
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232
233 /**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
245 * The socket data length is computed by subtracting the socket data length
246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262 }
263
264 /**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274 return (sk->sk_state == state || sk->sk_state == state2);
275 }
276
277 /**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
296 }
297
298 /**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
307 if (wq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310 rcu_read_unlock();
311 }
312
313 /**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318 {
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
341 if (confirm_recv)
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 }
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 if (imsg)
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354
355 skb->dev = iucv->hs_dev;
356 if (!skb->dev)
357 return -ENODEV;
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
359 return -ENETDOWN;
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
362 return -EMSGSIZE;
363 else
364 skb_trim(skb, skb->dev->mtu);
365 }
366 skb->protocol = ETH_P_AF_IUCV;
367 nskb = skb_clone(skb, GFP_ATOMIC);
368 if (!nskb)
369 return -ENOMEM;
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
372 if (net_xmit_eval(err)) {
373 skb_unlink(nskb, &iucv->send_skb_q);
374 kfree_skb(nskb);
375 } else {
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 }
379 return net_xmit_eval(err);
380 }
381
382 static struct sock *__iucv_get_sock_by_name(char *nm)
383 {
384 struct sock *sk;
385
386 sk_for_each(sk, &iucv_sk_list.head)
387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
388 return sk;
389
390 return NULL;
391 }
392
393 static void iucv_sock_destruct(struct sock *sk)
394 {
395 skb_queue_purge(&sk->sk_receive_queue);
396 skb_queue_purge(&sk->sk_error_queue);
397
398 sk_mem_reclaim(sk);
399
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
402 return;
403 }
404
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
409 }
410
411 /* Cleanup Listen */
412 static void iucv_sock_cleanup_listen(struct sock *parent)
413 {
414 struct sock *sk;
415
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
418 iucv_sock_close(sk);
419 iucv_sock_kill(sk);
420 }
421
422 parent->sk_state = IUCV_CLOSED;
423 }
424
425 /* Kill socket (only if zapped and orphaned) */
426 static void iucv_sock_kill(struct sock *sk)
427 {
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
429 return;
430
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
433 sock_put(sk);
434 }
435
436 /* Terminate an IUCV path */
437 static void iucv_sever_path(struct sock *sk, int with_user_data)
438 {
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
442
443 if (iucv->path) {
444 iucv->path = NULL;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
450 } else
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
453 }
454 }
455
456 /* Send FIN through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
458 {
459 int err = 0;
460 int blen;
461 struct sk_buff *skb;
462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 skb = sock_alloc_send_skb(sk, blen, 1, &err);
465 if (skb) {
466 skb_reserve(skb, blen);
467 err = afiucv_hs_send(NULL, sk, skb, flags);
468 }
469 return err;
470 }
471
472 /* Close an IUCV socket */
473 static void iucv_sock_close(struct sock *sk)
474 {
475 struct iucv_sock *iucv = iucv_sk(sk);
476 unsigned long timeo;
477 int err = 0;
478
479 lock_sock(sk);
480
481 switch (sk->sk_state) {
482 case IUCV_LISTEN:
483 iucv_sock_cleanup_listen(sk);
484 break;
485
486 case IUCV_CONNECTED:
487 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
489 sk->sk_state = IUCV_DISCONN;
490 sk->sk_state_change(sk);
491 }
492 case IUCV_DISCONN: /* fall through */
493 sk->sk_state = IUCV_CLOSING;
494 sk->sk_state_change(sk);
495
496 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
498 timeo = sk->sk_lingertime;
499 else
500 timeo = IUCV_DISCONN_TIMEOUT;
501 iucv_sock_wait(sk,
502 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
503 timeo);
504 }
505
506 case IUCV_CLOSING: /* fall through */
507 sk->sk_state = IUCV_CLOSED;
508 sk->sk_state_change(sk);
509
510 sk->sk_err = ECONNRESET;
511 sk->sk_state_change(sk);
512
513 skb_queue_purge(&iucv->send_skb_q);
514 skb_queue_purge(&iucv->backlog_skb_q);
515
516 default: /* fall through */
517 iucv_sever_path(sk, 1);
518 }
519
520 if (iucv->hs_dev) {
521 dev_put(iucv->hs_dev);
522 iucv->hs_dev = NULL;
523 sk->sk_bound_dev_if = 0;
524 }
525
526 /* mark socket for deletion by iucv_sock_kill() */
527 sock_set_flag(sk, SOCK_ZAPPED);
528
529 release_sock(sk);
530 }
531
532 static void iucv_sock_init(struct sock *sk, struct sock *parent)
533 {
534 if (parent)
535 sk->sk_type = parent->sk_type;
536 }
537
538 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
539 {
540 struct sock *sk;
541 struct iucv_sock *iucv;
542
543 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
544 if (!sk)
545 return NULL;
546 iucv = iucv_sk(sk);
547
548 sock_init_data(sock, sk);
549 INIT_LIST_HEAD(&iucv->accept_q);
550 spin_lock_init(&iucv->accept_q_lock);
551 skb_queue_head_init(&iucv->send_skb_q);
552 INIT_LIST_HEAD(&iucv->message_q.list);
553 spin_lock_init(&iucv->message_q.lock);
554 skb_queue_head_init(&iucv->backlog_skb_q);
555 iucv->send_tag = 0;
556 atomic_set(&iucv->pendings, 0);
557 iucv->flags = 0;
558 iucv->msglimit = 0;
559 atomic_set(&iucv->msg_sent, 0);
560 atomic_set(&iucv->msg_recv, 0);
561 iucv->path = NULL;
562 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
563 memset(&iucv->src_user_id , 0, 32);
564 if (pr_iucv)
565 iucv->transport = AF_IUCV_TRANS_IUCV;
566 else
567 iucv->transport = AF_IUCV_TRANS_HIPER;
568
569 sk->sk_destruct = iucv_sock_destruct;
570 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
571 sk->sk_allocation = GFP_DMA;
572
573 sock_reset_flag(sk, SOCK_ZAPPED);
574
575 sk->sk_protocol = proto;
576 sk->sk_state = IUCV_OPEN;
577
578 iucv_sock_link(&iucv_sk_list, sk);
579 return sk;
580 }
581
582 /* Create an IUCV socket */
583 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
584 int kern)
585 {
586 struct sock *sk;
587
588 if (protocol && protocol != PF_IUCV)
589 return -EPROTONOSUPPORT;
590
591 sock->state = SS_UNCONNECTED;
592
593 switch (sock->type) {
594 case SOCK_STREAM:
595 sock->ops = &iucv_sock_ops;
596 break;
597 case SOCK_SEQPACKET:
598 /* currently, proto ops can handle both sk types */
599 sock->ops = &iucv_sock_ops;
600 break;
601 default:
602 return -ESOCKTNOSUPPORT;
603 }
604
605 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
606 if (!sk)
607 return -ENOMEM;
608
609 iucv_sock_init(sk, NULL);
610
611 return 0;
612 }
613
614 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
615 {
616 write_lock_bh(&l->lock);
617 sk_add_node(sk, &l->head);
618 write_unlock_bh(&l->lock);
619 }
620
621 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
622 {
623 write_lock_bh(&l->lock);
624 sk_del_node_init(sk);
625 write_unlock_bh(&l->lock);
626 }
627
628 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
629 {
630 unsigned long flags;
631 struct iucv_sock *par = iucv_sk(parent);
632
633 sock_hold(sk);
634 spin_lock_irqsave(&par->accept_q_lock, flags);
635 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
636 spin_unlock_irqrestore(&par->accept_q_lock, flags);
637 iucv_sk(sk)->parent = parent;
638 sk_acceptq_added(parent);
639 }
640
641 void iucv_accept_unlink(struct sock *sk)
642 {
643 unsigned long flags;
644 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
645
646 spin_lock_irqsave(&par->accept_q_lock, flags);
647 list_del_init(&iucv_sk(sk)->accept_q);
648 spin_unlock_irqrestore(&par->accept_q_lock, flags);
649 sk_acceptq_removed(iucv_sk(sk)->parent);
650 iucv_sk(sk)->parent = NULL;
651 sock_put(sk);
652 }
653
654 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
655 {
656 struct iucv_sock *isk, *n;
657 struct sock *sk;
658
659 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
660 sk = (struct sock *) isk;
661 lock_sock(sk);
662
663 if (sk->sk_state == IUCV_CLOSED) {
664 iucv_accept_unlink(sk);
665 release_sock(sk);
666 continue;
667 }
668
669 if (sk->sk_state == IUCV_CONNECTED ||
670 sk->sk_state == IUCV_DISCONN ||
671 !newsock) {
672 iucv_accept_unlink(sk);
673 if (newsock)
674 sock_graft(sk, newsock);
675
676 release_sock(sk);
677 return sk;
678 }
679
680 release_sock(sk);
681 }
682 return NULL;
683 }
684
685 static void __iucv_auto_name(struct iucv_sock *iucv)
686 {
687 char name[12];
688
689 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
690 while (__iucv_get_sock_by_name(name)) {
691 sprintf(name, "%08x",
692 atomic_inc_return(&iucv_sk_list.autobind_name));
693 }
694 memcpy(iucv->src_name, name, 8);
695 }
696
697 /* Bind an unbound socket */
698 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
699 int addr_len)
700 {
701 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
702 struct sock *sk = sock->sk;
703 struct iucv_sock *iucv;
704 int err = 0;
705 struct net_device *dev;
706 char uid[9];
707
708 /* Verify the input sockaddr */
709 if (!addr || addr->sa_family != AF_IUCV)
710 return -EINVAL;
711
712 lock_sock(sk);
713 if (sk->sk_state != IUCV_OPEN) {
714 err = -EBADFD;
715 goto done;
716 }
717
718 write_lock_bh(&iucv_sk_list.lock);
719
720 iucv = iucv_sk(sk);
721 if (__iucv_get_sock_by_name(sa->siucv_name)) {
722 err = -EADDRINUSE;
723 goto done_unlock;
724 }
725 if (iucv->path)
726 goto done_unlock;
727
728 /* Bind the socket */
729 if (pr_iucv)
730 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
731 goto vm_bind; /* VM IUCV transport */
732
733 /* try hiper transport */
734 memcpy(uid, sa->siucv_user_id, sizeof(uid));
735 ASCEBC(uid, 8);
736 rcu_read_lock();
737 for_each_netdev_rcu(&init_net, dev) {
738 if (!memcmp(dev->perm_addr, uid, 8)) {
739 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
740 /* Check for unitialized siucv_name */
741 if (strncmp(sa->siucv_name, " ", 8) == 0)
742 __iucv_auto_name(iucv);
743 else
744 memcpy(iucv->src_name, sa->siucv_name, 8);
745 sk->sk_bound_dev_if = dev->ifindex;
746 iucv->hs_dev = dev;
747 dev_hold(dev);
748 sk->sk_state = IUCV_BOUND;
749 iucv->transport = AF_IUCV_TRANS_HIPER;
750 if (!iucv->msglimit)
751 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
752 rcu_read_unlock();
753 goto done_unlock;
754 }
755 }
756 rcu_read_unlock();
757 vm_bind:
758 if (pr_iucv) {
759 /* use local userid for backward compat */
760 memcpy(iucv->src_name, sa->siucv_name, 8);
761 memcpy(iucv->src_user_id, iucv_userid, 8);
762 sk->sk_state = IUCV_BOUND;
763 iucv->transport = AF_IUCV_TRANS_IUCV;
764 if (!iucv->msglimit)
765 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
766 goto done_unlock;
767 }
768 /* found no dev to bind */
769 err = -ENODEV;
770 done_unlock:
771 /* Release the socket list lock */
772 write_unlock_bh(&iucv_sk_list.lock);
773 done:
774 release_sock(sk);
775 return err;
776 }
777
778 /* Automatically bind an unbound socket */
779 static int iucv_sock_autobind(struct sock *sk)
780 {
781 struct iucv_sock *iucv = iucv_sk(sk);
782 int err = 0;
783
784 if (unlikely(!pr_iucv))
785 return -EPROTO;
786
787 memcpy(iucv->src_user_id, iucv_userid, 8);
788
789 write_lock_bh(&iucv_sk_list.lock);
790 __iucv_auto_name(iucv);
791 write_unlock_bh(&iucv_sk_list.lock);
792
793 if (!iucv->msglimit)
794 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
795
796 return err;
797 }
798
799 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
800 {
801 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
802 struct sock *sk = sock->sk;
803 struct iucv_sock *iucv = iucv_sk(sk);
804 unsigned char user_data[16];
805 int err;
806
807 high_nmcpy(user_data, sa->siucv_name);
808 low_nmcpy(user_data, iucv->src_name);
809 ASCEBC(user_data, sizeof(user_data));
810
811 /* Create path. */
812 iucv->path = iucv_path_alloc(iucv->msglimit,
813 IUCV_IPRMDATA, GFP_KERNEL);
814 if (!iucv->path) {
815 err = -ENOMEM;
816 goto done;
817 }
818 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
819 sa->siucv_user_id, NULL, user_data,
820 sk);
821 if (err) {
822 iucv_path_free(iucv->path);
823 iucv->path = NULL;
824 switch (err) {
825 case 0x0b: /* Target communicator is not logged on */
826 err = -ENETUNREACH;
827 break;
828 case 0x0d: /* Max connections for this guest exceeded */
829 case 0x0e: /* Max connections for target guest exceeded */
830 err = -EAGAIN;
831 break;
832 case 0x0f: /* Missing IUCV authorization */
833 err = -EACCES;
834 break;
835 default:
836 err = -ECONNREFUSED;
837 break;
838 }
839 }
840 done:
841 return err;
842 }
843
844 /* Connect an unconnected socket */
845 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
846 int alen, int flags)
847 {
848 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
849 struct sock *sk = sock->sk;
850 struct iucv_sock *iucv = iucv_sk(sk);
851 int err;
852
853 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
854 return -EINVAL;
855
856 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
857 return -EBADFD;
858
859 if (sk->sk_state == IUCV_OPEN &&
860 iucv->transport == AF_IUCV_TRANS_HIPER)
861 return -EBADFD; /* explicit bind required */
862
863 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
864 return -EINVAL;
865
866 if (sk->sk_state == IUCV_OPEN) {
867 err = iucv_sock_autobind(sk);
868 if (unlikely(err))
869 return err;
870 }
871
872 lock_sock(sk);
873
874 /* Set the destination information */
875 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
876 memcpy(iucv->dst_name, sa->siucv_name, 8);
877
878 if (iucv->transport == AF_IUCV_TRANS_HIPER)
879 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
880 else
881 err = afiucv_path_connect(sock, addr);
882 if (err)
883 goto done;
884
885 if (sk->sk_state != IUCV_CONNECTED)
886 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
887 IUCV_DISCONN),
888 sock_sndtimeo(sk, flags & O_NONBLOCK));
889
890 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
891 err = -ECONNREFUSED;
892
893 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
894 iucv_sever_path(sk, 0);
895
896 done:
897 release_sock(sk);
898 return err;
899 }
900
901 /* Move a socket into listening state. */
902 static int iucv_sock_listen(struct socket *sock, int backlog)
903 {
904 struct sock *sk = sock->sk;
905 int err;
906
907 lock_sock(sk);
908
909 err = -EINVAL;
910 if (sk->sk_state != IUCV_BOUND)
911 goto done;
912
913 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
914 goto done;
915
916 sk->sk_max_ack_backlog = backlog;
917 sk->sk_ack_backlog = 0;
918 sk->sk_state = IUCV_LISTEN;
919 err = 0;
920
921 done:
922 release_sock(sk);
923 return err;
924 }
925
926 /* Accept a pending connection */
927 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
928 int flags)
929 {
930 DECLARE_WAITQUEUE(wait, current);
931 struct sock *sk = sock->sk, *nsk;
932 long timeo;
933 int err = 0;
934
935 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
936
937 if (sk->sk_state != IUCV_LISTEN) {
938 err = -EBADFD;
939 goto done;
940 }
941
942 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
943
944 /* Wait for an incoming connection */
945 add_wait_queue_exclusive(sk_sleep(sk), &wait);
946 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
947 set_current_state(TASK_INTERRUPTIBLE);
948 if (!timeo) {
949 err = -EAGAIN;
950 break;
951 }
952
953 release_sock(sk);
954 timeo = schedule_timeout(timeo);
955 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
956
957 if (sk->sk_state != IUCV_LISTEN) {
958 err = -EBADFD;
959 break;
960 }
961
962 if (signal_pending(current)) {
963 err = sock_intr_errno(timeo);
964 break;
965 }
966 }
967
968 set_current_state(TASK_RUNNING);
969 remove_wait_queue(sk_sleep(sk), &wait);
970
971 if (err)
972 goto done;
973
974 newsock->state = SS_CONNECTED;
975
976 done:
977 release_sock(sk);
978 return err;
979 }
980
981 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
982 int *len, int peer)
983 {
984 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
985 struct sock *sk = sock->sk;
986 struct iucv_sock *iucv = iucv_sk(sk);
987
988 addr->sa_family = AF_IUCV;
989 *len = sizeof(struct sockaddr_iucv);
990
991 if (peer) {
992 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
993 memcpy(siucv->siucv_name, iucv->dst_name, 8);
994 } else {
995 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
996 memcpy(siucv->siucv_name, iucv->src_name, 8);
997 }
998 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
999 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1000 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1001
1002 return 0;
1003 }
1004
1005 /**
1006 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1007 * @path: IUCV path
1008 * @msg: Pointer to a struct iucv_message
1009 * @skb: The socket data to send, skb->len MUST BE <= 7
1010 *
1011 * Send the socket data in the parameter list in the iucv message
1012 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1013 * list and the socket data len at index 7 (last byte).
1014 * See also iucv_msg_length().
1015 *
1016 * Returns the error code from the iucv_message_send() call.
1017 */
1018 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1019 struct sk_buff *skb)
1020 {
1021 u8 prmdata[8];
1022
1023 memcpy(prmdata, (void *) skb->data, skb->len);
1024 prmdata[7] = 0xff - (u8) skb->len;
1025 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1026 (void *) prmdata, 8);
1027 }
1028
1029 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1030 size_t len)
1031 {
1032 struct sock *sk = sock->sk;
1033 struct iucv_sock *iucv = iucv_sk(sk);
1034 struct sk_buff *skb;
1035 struct iucv_message txmsg;
1036 struct cmsghdr *cmsg;
1037 int cmsg_done;
1038 long timeo;
1039 char user_id[9];
1040 char appl_id[9];
1041 int err;
1042 int noblock = msg->msg_flags & MSG_DONTWAIT;
1043
1044 err = sock_error(sk);
1045 if (err)
1046 return err;
1047
1048 if (msg->msg_flags & MSG_OOB)
1049 return -EOPNOTSUPP;
1050
1051 /* SOCK_SEQPACKET: we do not support segmented records */
1052 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1053 return -EOPNOTSUPP;
1054
1055 lock_sock(sk);
1056
1057 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1058 err = -EPIPE;
1059 goto out;
1060 }
1061
1062 /* Return if the socket is not in connected state */
1063 if (sk->sk_state != IUCV_CONNECTED) {
1064 err = -ENOTCONN;
1065 goto out;
1066 }
1067
1068 /* initialize defaults */
1069 cmsg_done = 0; /* check for duplicate headers */
1070 txmsg.class = 0;
1071
1072 /* iterate over control messages */
1073 for_each_cmsghdr(cmsg, msg) {
1074 if (!CMSG_OK(msg, cmsg)) {
1075 err = -EINVAL;
1076 goto out;
1077 }
1078
1079 if (cmsg->cmsg_level != SOL_IUCV)
1080 continue;
1081
1082 if (cmsg->cmsg_type & cmsg_done) {
1083 err = -EINVAL;
1084 goto out;
1085 }
1086 cmsg_done |= cmsg->cmsg_type;
1087
1088 switch (cmsg->cmsg_type) {
1089 case SCM_IUCV_TRGCLS:
1090 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1091 err = -EINVAL;
1092 goto out;
1093 }
1094
1095 /* set iucv message target class */
1096 memcpy(&txmsg.class,
1097 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1098
1099 break;
1100
1101 default:
1102 err = -EINVAL;
1103 goto out;
1104 }
1105 }
1106
1107 /* allocate one skb for each iucv message:
1108 * this is fine for SOCK_SEQPACKET (unless we want to support
1109 * segmented records using the MSG_EOR flag), but
1110 * for SOCK_STREAM we might want to improve it in future */
1111 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1112 skb = sock_alloc_send_skb(sk,
1113 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1114 noblock, &err);
1115 else
1116 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1117 if (!skb) {
1118 err = -ENOMEM;
1119 goto out;
1120 }
1121 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1122 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1123 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1124 err = -EFAULT;
1125 goto fail;
1126 }
1127
1128 /* wait if outstanding messages for iucv path has reached */
1129 timeo = sock_sndtimeo(sk, noblock);
1130 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1131 if (err)
1132 goto fail;
1133
1134 /* return -ECONNRESET if the socket is no longer connected */
1135 if (sk->sk_state != IUCV_CONNECTED) {
1136 err = -ECONNRESET;
1137 goto fail;
1138 }
1139
1140 /* increment and save iucv message tag for msg_completion cbk */
1141 txmsg.tag = iucv->send_tag++;
1142 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1143
1144 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1145 atomic_inc(&iucv->msg_sent);
1146 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1147 if (err) {
1148 atomic_dec(&iucv->msg_sent);
1149 goto fail;
1150 }
1151 goto release;
1152 }
1153 skb_queue_tail(&iucv->send_skb_q, skb);
1154
1155 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1156 && skb->len <= 7) {
1157 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1158
1159 /* on success: there is no message_complete callback
1160 * for an IPRMDATA msg; remove skb from send queue */
1161 if (err == 0) {
1162 skb_unlink(skb, &iucv->send_skb_q);
1163 kfree_skb(skb);
1164 }
1165
1166 /* this error should never happen since the
1167 * IUCV_IPRMDATA path flag is set... sever path */
1168 if (err == 0x15) {
1169 pr_iucv->path_sever(iucv->path, NULL);
1170 skb_unlink(skb, &iucv->send_skb_q);
1171 err = -EPIPE;
1172 goto fail;
1173 }
1174 } else
1175 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1176 (void *) skb->data, skb->len);
1177 if (err) {
1178 if (err == 3) {
1179 user_id[8] = 0;
1180 memcpy(user_id, iucv->dst_user_id, 8);
1181 appl_id[8] = 0;
1182 memcpy(appl_id, iucv->dst_name, 8);
1183 pr_err("Application %s on z/VM guest %s"
1184 " exceeds message limit\n",
1185 appl_id, user_id);
1186 err = -EAGAIN;
1187 } else
1188 err = -EPIPE;
1189 skb_unlink(skb, &iucv->send_skb_q);
1190 goto fail;
1191 }
1192
1193 release:
1194 release_sock(sk);
1195 return len;
1196
1197 fail:
1198 kfree_skb(skb);
1199 out:
1200 release_sock(sk);
1201 return err;
1202 }
1203
1204 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1205 *
1206 * Locking: must be called with message_q.lock held
1207 */
1208 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1209 {
1210 int dataleft, size, copied = 0;
1211 struct sk_buff *nskb;
1212
1213 dataleft = len;
1214 while (dataleft) {
1215 if (dataleft >= sk->sk_rcvbuf / 4)
1216 size = sk->sk_rcvbuf / 4;
1217 else
1218 size = dataleft;
1219
1220 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1221 if (!nskb)
1222 return -ENOMEM;
1223
1224 /* copy target class to control buffer of new skb */
1225 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1226
1227 /* copy data fragment */
1228 memcpy(nskb->data, skb->data + copied, size);
1229 copied += size;
1230 dataleft -= size;
1231
1232 skb_reset_transport_header(nskb);
1233 skb_reset_network_header(nskb);
1234 nskb->len = size;
1235
1236 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1237 }
1238
1239 return 0;
1240 }
1241
1242 /* iucv_process_message() - Receive a single outstanding IUCV message
1243 *
1244 * Locking: must be called with message_q.lock held
1245 */
1246 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1247 struct iucv_path *path,
1248 struct iucv_message *msg)
1249 {
1250 int rc;
1251 unsigned int len;
1252
1253 len = iucv_msg_length(msg);
1254
1255 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1256 /* Note: the first 4 bytes are reserved for msg tag */
1257 IUCV_SKB_CB(skb)->class = msg->class;
1258
1259 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1260 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1261 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1262 skb->data = NULL;
1263 skb->len = 0;
1264 }
1265 } else {
1266 rc = pr_iucv->message_receive(path, msg,
1267 msg->flags & IUCV_IPRMDATA,
1268 skb->data, len, NULL);
1269 if (rc) {
1270 kfree_skb(skb);
1271 return;
1272 }
1273 /* we need to fragment iucv messages for SOCK_STREAM only;
1274 * for SOCK_SEQPACKET, it is only relevant if we support
1275 * record segmentation using MSG_EOR (see also recvmsg()) */
1276 if (sk->sk_type == SOCK_STREAM &&
1277 skb->truesize >= sk->sk_rcvbuf / 4) {
1278 rc = iucv_fragment_skb(sk, skb, len);
1279 kfree_skb(skb);
1280 skb = NULL;
1281 if (rc) {
1282 pr_iucv->path_sever(path, NULL);
1283 return;
1284 }
1285 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1286 } else {
1287 skb_reset_transport_header(skb);
1288 skb_reset_network_header(skb);
1289 skb->len = len;
1290 }
1291 }
1292
1293 IUCV_SKB_CB(skb)->offset = 0;
1294 if (sock_queue_rcv_skb(sk, skb))
1295 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1296 }
1297
1298 /* iucv_process_message_q() - Process outstanding IUCV messages
1299 *
1300 * Locking: must be called with message_q.lock held
1301 */
1302 static void iucv_process_message_q(struct sock *sk)
1303 {
1304 struct iucv_sock *iucv = iucv_sk(sk);
1305 struct sk_buff *skb;
1306 struct sock_msg_q *p, *n;
1307
1308 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1309 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1310 if (!skb)
1311 break;
1312 iucv_process_message(sk, skb, p->path, &p->msg);
1313 list_del(&p->list);
1314 kfree(p);
1315 if (!skb_queue_empty(&iucv->backlog_skb_q))
1316 break;
1317 }
1318 }
1319
1320 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1321 size_t len, int flags)
1322 {
1323 int noblock = flags & MSG_DONTWAIT;
1324 struct sock *sk = sock->sk;
1325 struct iucv_sock *iucv = iucv_sk(sk);
1326 unsigned int copied, rlen;
1327 struct sk_buff *skb, *rskb, *cskb;
1328 int err = 0;
1329 u32 offset;
1330
1331 if ((sk->sk_state == IUCV_DISCONN) &&
1332 skb_queue_empty(&iucv->backlog_skb_q) &&
1333 skb_queue_empty(&sk->sk_receive_queue) &&
1334 list_empty(&iucv->message_q.list))
1335 return 0;
1336
1337 if (flags & (MSG_OOB))
1338 return -EOPNOTSUPP;
1339
1340 /* receive/dequeue next skb:
1341 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1342 skb = skb_recv_datagram(sk, flags, noblock, &err);
1343 if (!skb) {
1344 if (sk->sk_shutdown & RCV_SHUTDOWN)
1345 return 0;
1346 return err;
1347 }
1348
1349 offset = IUCV_SKB_CB(skb)->offset;
1350 rlen = skb->len - offset; /* real length of skb */
1351 copied = min_t(unsigned int, rlen, len);
1352 if (!rlen)
1353 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1354
1355 cskb = skb;
1356 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1357 if (!(flags & MSG_PEEK))
1358 skb_queue_head(&sk->sk_receive_queue, skb);
1359 return -EFAULT;
1360 }
1361
1362 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1363 if (sk->sk_type == SOCK_SEQPACKET) {
1364 if (copied < rlen)
1365 msg->msg_flags |= MSG_TRUNC;
1366 /* each iucv message contains a complete record */
1367 msg->msg_flags |= MSG_EOR;
1368 }
1369
1370 /* create control message to store iucv msg target class:
1371 * get the trgcls from the control buffer of the skb due to
1372 * fragmentation of original iucv message. */
1373 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1374 sizeof(IUCV_SKB_CB(skb)->class),
1375 (void *)&IUCV_SKB_CB(skb)->class);
1376 if (err) {
1377 if (!(flags & MSG_PEEK))
1378 skb_queue_head(&sk->sk_receive_queue, skb);
1379 return err;
1380 }
1381
1382 /* Mark read part of skb as used */
1383 if (!(flags & MSG_PEEK)) {
1384
1385 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1386 if (sk->sk_type == SOCK_STREAM) {
1387 if (copied < rlen) {
1388 IUCV_SKB_CB(skb)->offset = offset + copied;
1389 skb_queue_head(&sk->sk_receive_queue, skb);
1390 goto done;
1391 }
1392 }
1393
1394 kfree_skb(skb);
1395 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1396 atomic_inc(&iucv->msg_recv);
1397 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1398 WARN_ON(1);
1399 iucv_sock_close(sk);
1400 return -EFAULT;
1401 }
1402 }
1403
1404 /* Queue backlog skbs */
1405 spin_lock_bh(&iucv->message_q.lock);
1406 rskb = skb_dequeue(&iucv->backlog_skb_q);
1407 while (rskb) {
1408 IUCV_SKB_CB(rskb)->offset = 0;
1409 if (sock_queue_rcv_skb(sk, rskb)) {
1410 skb_queue_head(&iucv->backlog_skb_q,
1411 rskb);
1412 break;
1413 } else {
1414 rskb = skb_dequeue(&iucv->backlog_skb_q);
1415 }
1416 }
1417 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1418 if (!list_empty(&iucv->message_q.list))
1419 iucv_process_message_q(sk);
1420 if (atomic_read(&iucv->msg_recv) >=
1421 iucv->msglimit / 2) {
1422 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1423 if (err) {
1424 sk->sk_state = IUCV_DISCONN;
1425 sk->sk_state_change(sk);
1426 }
1427 }
1428 }
1429 spin_unlock_bh(&iucv->message_q.lock);
1430 }
1431
1432 done:
1433 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1434 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1435 copied = rlen;
1436
1437 return copied;
1438 }
1439
1440 static inline unsigned int iucv_accept_poll(struct sock *parent)
1441 {
1442 struct iucv_sock *isk, *n;
1443 struct sock *sk;
1444
1445 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1446 sk = (struct sock *) isk;
1447
1448 if (sk->sk_state == IUCV_CONNECTED)
1449 return POLLIN | POLLRDNORM;
1450 }
1451
1452 return 0;
1453 }
1454
1455 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1456 poll_table *wait)
1457 {
1458 struct sock *sk = sock->sk;
1459 unsigned int mask = 0;
1460
1461 sock_poll_wait(file, sk_sleep(sk), wait);
1462
1463 if (sk->sk_state == IUCV_LISTEN)
1464 return iucv_accept_poll(sk);
1465
1466 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1467 mask |= POLLERR |
1468 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1469
1470 if (sk->sk_shutdown & RCV_SHUTDOWN)
1471 mask |= POLLRDHUP;
1472
1473 if (sk->sk_shutdown == SHUTDOWN_MASK)
1474 mask |= POLLHUP;
1475
1476 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1477 (sk->sk_shutdown & RCV_SHUTDOWN))
1478 mask |= POLLIN | POLLRDNORM;
1479
1480 if (sk->sk_state == IUCV_CLOSED)
1481 mask |= POLLHUP;
1482
1483 if (sk->sk_state == IUCV_DISCONN)
1484 mask |= POLLIN;
1485
1486 if (sock_writeable(sk) && iucv_below_msglim(sk))
1487 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1488 else
1489 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1490
1491 return mask;
1492 }
1493
1494 static int iucv_sock_shutdown(struct socket *sock, int how)
1495 {
1496 struct sock *sk = sock->sk;
1497 struct iucv_sock *iucv = iucv_sk(sk);
1498 struct iucv_message txmsg;
1499 int err = 0;
1500
1501 how++;
1502
1503 if ((how & ~SHUTDOWN_MASK) || !how)
1504 return -EINVAL;
1505
1506 lock_sock(sk);
1507 switch (sk->sk_state) {
1508 case IUCV_LISTEN:
1509 case IUCV_DISCONN:
1510 case IUCV_CLOSING:
1511 case IUCV_CLOSED:
1512 err = -ENOTCONN;
1513 goto fail;
1514 default:
1515 break;
1516 }
1517
1518 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1519 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1520 txmsg.class = 0;
1521 txmsg.tag = 0;
1522 err = pr_iucv->message_send(iucv->path, &txmsg,
1523 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1524 if (err) {
1525 switch (err) {
1526 case 1:
1527 err = -ENOTCONN;
1528 break;
1529 case 2:
1530 err = -ECONNRESET;
1531 break;
1532 default:
1533 err = -ENOTCONN;
1534 break;
1535 }
1536 }
1537 } else
1538 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1539 }
1540
1541 sk->sk_shutdown |= how;
1542 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1543 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1544 iucv->path) {
1545 err = pr_iucv->path_quiesce(iucv->path, NULL);
1546 if (err)
1547 err = -ENOTCONN;
1548 /* skb_queue_purge(&sk->sk_receive_queue); */
1549 }
1550 skb_queue_purge(&sk->sk_receive_queue);
1551 }
1552
1553 /* Wake up anyone sleeping in poll */
1554 sk->sk_state_change(sk);
1555
1556 fail:
1557 release_sock(sk);
1558 return err;
1559 }
1560
1561 static int iucv_sock_release(struct socket *sock)
1562 {
1563 struct sock *sk = sock->sk;
1564 int err = 0;
1565
1566 if (!sk)
1567 return 0;
1568
1569 iucv_sock_close(sk);
1570
1571 sock_orphan(sk);
1572 iucv_sock_kill(sk);
1573 return err;
1574 }
1575
1576 /* getsockopt and setsockopt */
1577 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1578 char __user *optval, unsigned int optlen)
1579 {
1580 struct sock *sk = sock->sk;
1581 struct iucv_sock *iucv = iucv_sk(sk);
1582 int val;
1583 int rc;
1584
1585 if (level != SOL_IUCV)
1586 return -ENOPROTOOPT;
1587
1588 if (optlen < sizeof(int))
1589 return -EINVAL;
1590
1591 if (get_user(val, (int __user *) optval))
1592 return -EFAULT;
1593
1594 rc = 0;
1595
1596 lock_sock(sk);
1597 switch (optname) {
1598 case SO_IPRMDATA_MSG:
1599 if (val)
1600 iucv->flags |= IUCV_IPRMDATA;
1601 else
1602 iucv->flags &= ~IUCV_IPRMDATA;
1603 break;
1604 case SO_MSGLIMIT:
1605 switch (sk->sk_state) {
1606 case IUCV_OPEN:
1607 case IUCV_BOUND:
1608 if (val < 1 || val > (u16)(~0))
1609 rc = -EINVAL;
1610 else
1611 iucv->msglimit = val;
1612 break;
1613 default:
1614 rc = -EINVAL;
1615 break;
1616 }
1617 break;
1618 default:
1619 rc = -ENOPROTOOPT;
1620 break;
1621 }
1622 release_sock(sk);
1623
1624 return rc;
1625 }
1626
1627 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1628 char __user *optval, int __user *optlen)
1629 {
1630 struct sock *sk = sock->sk;
1631 struct iucv_sock *iucv = iucv_sk(sk);
1632 unsigned int val;
1633 int len;
1634
1635 if (level != SOL_IUCV)
1636 return -ENOPROTOOPT;
1637
1638 if (get_user(len, optlen))
1639 return -EFAULT;
1640
1641 if (len < 0)
1642 return -EINVAL;
1643
1644 len = min_t(unsigned int, len, sizeof(int));
1645
1646 switch (optname) {
1647 case SO_IPRMDATA_MSG:
1648 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1649 break;
1650 case SO_MSGLIMIT:
1651 lock_sock(sk);
1652 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1653 : iucv->msglimit; /* default */
1654 release_sock(sk);
1655 break;
1656 case SO_MSGSIZE:
1657 if (sk->sk_state == IUCV_OPEN)
1658 return -EBADFD;
1659 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1660 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1661 0x7fffffff;
1662 break;
1663 default:
1664 return -ENOPROTOOPT;
1665 }
1666
1667 if (put_user(len, optlen))
1668 return -EFAULT;
1669 if (copy_to_user(optval, &val, len))
1670 return -EFAULT;
1671
1672 return 0;
1673 }
1674
1675
1676 /* Callback wrappers - called from iucv base support */
1677 static int iucv_callback_connreq(struct iucv_path *path,
1678 u8 ipvmid[8], u8 ipuser[16])
1679 {
1680 unsigned char user_data[16];
1681 unsigned char nuser_data[16];
1682 unsigned char src_name[8];
1683 struct sock *sk, *nsk;
1684 struct iucv_sock *iucv, *niucv;
1685 int err;
1686
1687 memcpy(src_name, ipuser, 8);
1688 EBCASC(src_name, 8);
1689 /* Find out if this path belongs to af_iucv. */
1690 read_lock(&iucv_sk_list.lock);
1691 iucv = NULL;
1692 sk = NULL;
1693 sk_for_each(sk, &iucv_sk_list.head)
1694 if (sk->sk_state == IUCV_LISTEN &&
1695 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1696 /*
1697 * Found a listening socket with
1698 * src_name == ipuser[0-7].
1699 */
1700 iucv = iucv_sk(sk);
1701 break;
1702 }
1703 read_unlock(&iucv_sk_list.lock);
1704 if (!iucv)
1705 /* No socket found, not one of our paths. */
1706 return -EINVAL;
1707
1708 bh_lock_sock(sk);
1709
1710 /* Check if parent socket is listening */
1711 low_nmcpy(user_data, iucv->src_name);
1712 high_nmcpy(user_data, iucv->dst_name);
1713 ASCEBC(user_data, sizeof(user_data));
1714 if (sk->sk_state != IUCV_LISTEN) {
1715 err = pr_iucv->path_sever(path, user_data);
1716 iucv_path_free(path);
1717 goto fail;
1718 }
1719
1720 /* Check for backlog size */
1721 if (sk_acceptq_is_full(sk)) {
1722 err = pr_iucv->path_sever(path, user_data);
1723 iucv_path_free(path);
1724 goto fail;
1725 }
1726
1727 /* Create the new socket */
1728 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1729 if (!nsk) {
1730 err = pr_iucv->path_sever(path, user_data);
1731 iucv_path_free(path);
1732 goto fail;
1733 }
1734
1735 niucv = iucv_sk(nsk);
1736 iucv_sock_init(nsk, sk);
1737
1738 /* Set the new iucv_sock */
1739 memcpy(niucv->dst_name, ipuser + 8, 8);
1740 EBCASC(niucv->dst_name, 8);
1741 memcpy(niucv->dst_user_id, ipvmid, 8);
1742 memcpy(niucv->src_name, iucv->src_name, 8);
1743 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1744 niucv->path = path;
1745
1746 /* Call iucv_accept */
1747 high_nmcpy(nuser_data, ipuser + 8);
1748 memcpy(nuser_data + 8, niucv->src_name, 8);
1749 ASCEBC(nuser_data + 8, 8);
1750
1751 /* set message limit for path based on msglimit of accepting socket */
1752 niucv->msglimit = iucv->msglimit;
1753 path->msglim = iucv->msglimit;
1754 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1755 if (err) {
1756 iucv_sever_path(nsk, 1);
1757 iucv_sock_kill(nsk);
1758 goto fail;
1759 }
1760
1761 iucv_accept_enqueue(sk, nsk);
1762
1763 /* Wake up accept */
1764 nsk->sk_state = IUCV_CONNECTED;
1765 sk->sk_data_ready(sk);
1766 err = 0;
1767 fail:
1768 bh_unlock_sock(sk);
1769 return 0;
1770 }
1771
1772 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1773 {
1774 struct sock *sk = path->private;
1775
1776 sk->sk_state = IUCV_CONNECTED;
1777 sk->sk_state_change(sk);
1778 }
1779
1780 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1781 {
1782 struct sock *sk = path->private;
1783 struct iucv_sock *iucv = iucv_sk(sk);
1784 struct sk_buff *skb;
1785 struct sock_msg_q *save_msg;
1786 int len;
1787
1788 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1789 pr_iucv->message_reject(path, msg);
1790 return;
1791 }
1792
1793 spin_lock(&iucv->message_q.lock);
1794
1795 if (!list_empty(&iucv->message_q.list) ||
1796 !skb_queue_empty(&iucv->backlog_skb_q))
1797 goto save_message;
1798
1799 len = atomic_read(&sk->sk_rmem_alloc);
1800 len += SKB_TRUESIZE(iucv_msg_length(msg));
1801 if (len > sk->sk_rcvbuf)
1802 goto save_message;
1803
1804 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1805 if (!skb)
1806 goto save_message;
1807
1808 iucv_process_message(sk, skb, path, msg);
1809 goto out_unlock;
1810
1811 save_message:
1812 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1813 if (!save_msg)
1814 goto out_unlock;
1815 save_msg->path = path;
1816 save_msg->msg = *msg;
1817
1818 list_add_tail(&save_msg->list, &iucv->message_q.list);
1819
1820 out_unlock:
1821 spin_unlock(&iucv->message_q.lock);
1822 }
1823
1824 static void iucv_callback_txdone(struct iucv_path *path,
1825 struct iucv_message *msg)
1826 {
1827 struct sock *sk = path->private;
1828 struct sk_buff *this = NULL;
1829 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1830 struct sk_buff *list_skb = list->next;
1831 unsigned long flags;
1832
1833 bh_lock_sock(sk);
1834 if (!skb_queue_empty(list)) {
1835 spin_lock_irqsave(&list->lock, flags);
1836
1837 while (list_skb != (struct sk_buff *)list) {
1838 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1839 this = list_skb;
1840 break;
1841 }
1842 list_skb = list_skb->next;
1843 }
1844 if (this)
1845 __skb_unlink(this, list);
1846
1847 spin_unlock_irqrestore(&list->lock, flags);
1848
1849 if (this) {
1850 kfree_skb(this);
1851 /* wake up any process waiting for sending */
1852 iucv_sock_wake_msglim(sk);
1853 }
1854 }
1855
1856 if (sk->sk_state == IUCV_CLOSING) {
1857 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1858 sk->sk_state = IUCV_CLOSED;
1859 sk->sk_state_change(sk);
1860 }
1861 }
1862 bh_unlock_sock(sk);
1863
1864 }
1865
1866 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1867 {
1868 struct sock *sk = path->private;
1869
1870 if (sk->sk_state == IUCV_CLOSED)
1871 return;
1872
1873 bh_lock_sock(sk);
1874 iucv_sever_path(sk, 1);
1875 sk->sk_state = IUCV_DISCONN;
1876
1877 sk->sk_state_change(sk);
1878 bh_unlock_sock(sk);
1879 }
1880
1881 /* called if the other communication side shuts down its RECV direction;
1882 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1883 */
1884 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1885 {
1886 struct sock *sk = path->private;
1887
1888 bh_lock_sock(sk);
1889 if (sk->sk_state != IUCV_CLOSED) {
1890 sk->sk_shutdown |= SEND_SHUTDOWN;
1891 sk->sk_state_change(sk);
1892 }
1893 bh_unlock_sock(sk);
1894 }
1895
1896 /***************** HiperSockets transport callbacks ********************/
1897 static void afiucv_swap_src_dest(struct sk_buff *skb)
1898 {
1899 struct af_iucv_trans_hdr *trans_hdr =
1900 (struct af_iucv_trans_hdr *)skb->data;
1901 char tmpID[8];
1902 char tmpName[8];
1903
1904 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1905 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1906 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1907 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1908 memcpy(tmpID, trans_hdr->srcUserID, 8);
1909 memcpy(tmpName, trans_hdr->srcAppName, 8);
1910 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1911 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1912 memcpy(trans_hdr->destUserID, tmpID, 8);
1913 memcpy(trans_hdr->destAppName, tmpName, 8);
1914 skb_push(skb, ETH_HLEN);
1915 memset(skb->data, 0, ETH_HLEN);
1916 }
1917
1918 /**
1919 * afiucv_hs_callback_syn - react on received SYN
1920 **/
1921 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1922 {
1923 struct sock *nsk;
1924 struct iucv_sock *iucv, *niucv;
1925 struct af_iucv_trans_hdr *trans_hdr;
1926 int err;
1927
1928 iucv = iucv_sk(sk);
1929 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1930 if (!iucv) {
1931 /* no sock - connection refused */
1932 afiucv_swap_src_dest(skb);
1933 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1934 err = dev_queue_xmit(skb);
1935 goto out;
1936 }
1937
1938 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1939 bh_lock_sock(sk);
1940 if ((sk->sk_state != IUCV_LISTEN) ||
1941 sk_acceptq_is_full(sk) ||
1942 !nsk) {
1943 /* error on server socket - connection refused */
1944 afiucv_swap_src_dest(skb);
1945 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1946 err = dev_queue_xmit(skb);
1947 iucv_sock_kill(nsk);
1948 bh_unlock_sock(sk);
1949 goto out;
1950 }
1951
1952 niucv = iucv_sk(nsk);
1953 iucv_sock_init(nsk, sk);
1954 niucv->transport = AF_IUCV_TRANS_HIPER;
1955 niucv->msglimit = iucv->msglimit;
1956 if (!trans_hdr->window)
1957 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1958 else
1959 niucv->msglimit_peer = trans_hdr->window;
1960 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1961 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1962 memcpy(niucv->src_name, iucv->src_name, 8);
1963 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1964 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1965 niucv->hs_dev = iucv->hs_dev;
1966 dev_hold(niucv->hs_dev);
1967 afiucv_swap_src_dest(skb);
1968 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1969 trans_hdr->window = niucv->msglimit;
1970 /* if receiver acks the xmit connection is established */
1971 err = dev_queue_xmit(skb);
1972 if (!err) {
1973 iucv_accept_enqueue(sk, nsk);
1974 nsk->sk_state = IUCV_CONNECTED;
1975 sk->sk_data_ready(sk);
1976 } else
1977 iucv_sock_kill(nsk);
1978 bh_unlock_sock(sk);
1979
1980 out:
1981 return NET_RX_SUCCESS;
1982 }
1983
1984 /**
1985 * afiucv_hs_callback_synack() - react on received SYN-ACK
1986 **/
1987 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1988 {
1989 struct iucv_sock *iucv = iucv_sk(sk);
1990 struct af_iucv_trans_hdr *trans_hdr =
1991 (struct af_iucv_trans_hdr *)skb->data;
1992
1993 if (!iucv)
1994 goto out;
1995 if (sk->sk_state != IUCV_BOUND)
1996 goto out;
1997 bh_lock_sock(sk);
1998 iucv->msglimit_peer = trans_hdr->window;
1999 sk->sk_state = IUCV_CONNECTED;
2000 sk->sk_state_change(sk);
2001 bh_unlock_sock(sk);
2002 out:
2003 kfree_skb(skb);
2004 return NET_RX_SUCCESS;
2005 }
2006
2007 /**
2008 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2009 **/
2010 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2011 {
2012 struct iucv_sock *iucv = iucv_sk(sk);
2013
2014 if (!iucv)
2015 goto out;
2016 if (sk->sk_state != IUCV_BOUND)
2017 goto out;
2018 bh_lock_sock(sk);
2019 sk->sk_state = IUCV_DISCONN;
2020 sk->sk_state_change(sk);
2021 bh_unlock_sock(sk);
2022 out:
2023 kfree_skb(skb);
2024 return NET_RX_SUCCESS;
2025 }
2026
2027 /**
2028 * afiucv_hs_callback_fin() - react on received FIN
2029 **/
2030 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2031 {
2032 struct iucv_sock *iucv = iucv_sk(sk);
2033
2034 /* other end of connection closed */
2035 if (!iucv)
2036 goto out;
2037 bh_lock_sock(sk);
2038 if (sk->sk_state == IUCV_CONNECTED) {
2039 sk->sk_state = IUCV_DISCONN;
2040 sk->sk_state_change(sk);
2041 }
2042 bh_unlock_sock(sk);
2043 out:
2044 kfree_skb(skb);
2045 return NET_RX_SUCCESS;
2046 }
2047
2048 /**
2049 * afiucv_hs_callback_win() - react on received WIN
2050 **/
2051 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2052 {
2053 struct iucv_sock *iucv = iucv_sk(sk);
2054 struct af_iucv_trans_hdr *trans_hdr =
2055 (struct af_iucv_trans_hdr *)skb->data;
2056
2057 if (!iucv)
2058 return NET_RX_SUCCESS;
2059
2060 if (sk->sk_state != IUCV_CONNECTED)
2061 return NET_RX_SUCCESS;
2062
2063 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2064 iucv_sock_wake_msglim(sk);
2065 return NET_RX_SUCCESS;
2066 }
2067
2068 /**
2069 * afiucv_hs_callback_rx() - react on received data
2070 **/
2071 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2072 {
2073 struct iucv_sock *iucv = iucv_sk(sk);
2074
2075 if (!iucv) {
2076 kfree_skb(skb);
2077 return NET_RX_SUCCESS;
2078 }
2079
2080 if (sk->sk_state != IUCV_CONNECTED) {
2081 kfree_skb(skb);
2082 return NET_RX_SUCCESS;
2083 }
2084
2085 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2086 kfree_skb(skb);
2087 return NET_RX_SUCCESS;
2088 }
2089
2090 /* write stuff from iucv_msg to skb cb */
2091 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2092 kfree_skb(skb);
2093 return NET_RX_SUCCESS;
2094 }
2095 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2096 skb_reset_transport_header(skb);
2097 skb_reset_network_header(skb);
2098 IUCV_SKB_CB(skb)->offset = 0;
2099 spin_lock(&iucv->message_q.lock);
2100 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2101 if (sock_queue_rcv_skb(sk, skb)) {
2102 /* handle rcv queue full */
2103 skb_queue_tail(&iucv->backlog_skb_q, skb);
2104 }
2105 } else
2106 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2107 spin_unlock(&iucv->message_q.lock);
2108 return NET_RX_SUCCESS;
2109 }
2110
2111 /**
2112 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2113 * transport
2114 * called from netif RX softirq
2115 **/
2116 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2117 struct packet_type *pt, struct net_device *orig_dev)
2118 {
2119 struct sock *sk;
2120 struct iucv_sock *iucv;
2121 struct af_iucv_trans_hdr *trans_hdr;
2122 char nullstring[8];
2123 int err = 0;
2124
2125 skb_pull(skb, ETH_HLEN);
2126 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2127 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2128 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2129 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2130 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2131 memset(nullstring, 0, sizeof(nullstring));
2132 iucv = NULL;
2133 sk = NULL;
2134 read_lock(&iucv_sk_list.lock);
2135 sk_for_each(sk, &iucv_sk_list.head) {
2136 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2137 if ((!memcmp(&iucv_sk(sk)->src_name,
2138 trans_hdr->destAppName, 8)) &&
2139 (!memcmp(&iucv_sk(sk)->src_user_id,
2140 trans_hdr->destUserID, 8)) &&
2141 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2142 (!memcmp(&iucv_sk(sk)->dst_user_id,
2143 nullstring, 8))) {
2144 iucv = iucv_sk(sk);
2145 break;
2146 }
2147 } else {
2148 if ((!memcmp(&iucv_sk(sk)->src_name,
2149 trans_hdr->destAppName, 8)) &&
2150 (!memcmp(&iucv_sk(sk)->src_user_id,
2151 trans_hdr->destUserID, 8)) &&
2152 (!memcmp(&iucv_sk(sk)->dst_name,
2153 trans_hdr->srcAppName, 8)) &&
2154 (!memcmp(&iucv_sk(sk)->dst_user_id,
2155 trans_hdr->srcUserID, 8))) {
2156 iucv = iucv_sk(sk);
2157 break;
2158 }
2159 }
2160 }
2161 read_unlock(&iucv_sk_list.lock);
2162 if (!iucv)
2163 sk = NULL;
2164
2165 /* no sock
2166 how should we send with no sock
2167 1) send without sock no send rc checking?
2168 2) introduce default sock to handle this cases
2169
2170 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2171 data -> send FIN
2172 SYN|ACK, SYN|FIN, FIN -> no action? */
2173
2174 switch (trans_hdr->flags) {
2175 case AF_IUCV_FLAG_SYN:
2176 /* connect request */
2177 err = afiucv_hs_callback_syn(sk, skb);
2178 break;
2179 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2180 /* connect request confirmed */
2181 err = afiucv_hs_callback_synack(sk, skb);
2182 break;
2183 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2184 /* connect request refused */
2185 err = afiucv_hs_callback_synfin(sk, skb);
2186 break;
2187 case (AF_IUCV_FLAG_FIN):
2188 /* close request */
2189 err = afiucv_hs_callback_fin(sk, skb);
2190 break;
2191 case (AF_IUCV_FLAG_WIN):
2192 err = afiucv_hs_callback_win(sk, skb);
2193 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2194 kfree_skb(skb);
2195 break;
2196 }
2197 /* fall through and receive non-zero length data */
2198 case (AF_IUCV_FLAG_SHT):
2199 /* shutdown request */
2200 /* fall through and receive zero length data */
2201 case 0:
2202 /* plain data frame */
2203 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2204 err = afiucv_hs_callback_rx(sk, skb);
2205 break;
2206 default:
2207 ;
2208 }
2209
2210 return err;
2211 }
2212
2213 /**
2214 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2215 * transport
2216 **/
2217 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2218 enum iucv_tx_notify n)
2219 {
2220 struct sock *isk = skb->sk;
2221 struct sock *sk = NULL;
2222 struct iucv_sock *iucv = NULL;
2223 struct sk_buff_head *list;
2224 struct sk_buff *list_skb;
2225 struct sk_buff *nskb;
2226 unsigned long flags;
2227
2228 read_lock_irqsave(&iucv_sk_list.lock, flags);
2229 sk_for_each(sk, &iucv_sk_list.head)
2230 if (sk == isk) {
2231 iucv = iucv_sk(sk);
2232 break;
2233 }
2234 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2235
2236 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2237 return;
2238
2239 list = &iucv->send_skb_q;
2240 spin_lock_irqsave(&list->lock, flags);
2241 if (skb_queue_empty(list))
2242 goto out_unlock;
2243 list_skb = list->next;
2244 nskb = list_skb->next;
2245 while (list_skb != (struct sk_buff *)list) {
2246 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2247 switch (n) {
2248 case TX_NOTIFY_OK:
2249 __skb_unlink(list_skb, list);
2250 kfree_skb(list_skb);
2251 iucv_sock_wake_msglim(sk);
2252 break;
2253 case TX_NOTIFY_PENDING:
2254 atomic_inc(&iucv->pendings);
2255 break;
2256 case TX_NOTIFY_DELAYED_OK:
2257 __skb_unlink(list_skb, list);
2258 atomic_dec(&iucv->pendings);
2259 if (atomic_read(&iucv->pendings) <= 0)
2260 iucv_sock_wake_msglim(sk);
2261 kfree_skb(list_skb);
2262 break;
2263 case TX_NOTIFY_UNREACHABLE:
2264 case TX_NOTIFY_DELAYED_UNREACHABLE:
2265 case TX_NOTIFY_TPQFULL: /* not yet used */
2266 case TX_NOTIFY_GENERALERROR:
2267 case TX_NOTIFY_DELAYED_GENERALERROR:
2268 __skb_unlink(list_skb, list);
2269 kfree_skb(list_skb);
2270 if (sk->sk_state == IUCV_CONNECTED) {
2271 sk->sk_state = IUCV_DISCONN;
2272 sk->sk_state_change(sk);
2273 }
2274 break;
2275 }
2276 break;
2277 }
2278 list_skb = nskb;
2279 nskb = nskb->next;
2280 }
2281 out_unlock:
2282 spin_unlock_irqrestore(&list->lock, flags);
2283
2284 if (sk->sk_state == IUCV_CLOSING) {
2285 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2286 sk->sk_state = IUCV_CLOSED;
2287 sk->sk_state_change(sk);
2288 }
2289 }
2290
2291 }
2292
2293 /*
2294 * afiucv_netdev_event: handle netdev notifier chain events
2295 */
2296 static int afiucv_netdev_event(struct notifier_block *this,
2297 unsigned long event, void *ptr)
2298 {
2299 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2300 struct sock *sk;
2301 struct iucv_sock *iucv;
2302
2303 switch (event) {
2304 case NETDEV_REBOOT:
2305 case NETDEV_GOING_DOWN:
2306 sk_for_each(sk, &iucv_sk_list.head) {
2307 iucv = iucv_sk(sk);
2308 if ((iucv->hs_dev == event_dev) &&
2309 (sk->sk_state == IUCV_CONNECTED)) {
2310 if (event == NETDEV_GOING_DOWN)
2311 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2312 sk->sk_state = IUCV_DISCONN;
2313 sk->sk_state_change(sk);
2314 }
2315 }
2316 break;
2317 case NETDEV_DOWN:
2318 case NETDEV_UNREGISTER:
2319 default:
2320 break;
2321 }
2322 return NOTIFY_DONE;
2323 }
2324
2325 static struct notifier_block afiucv_netdev_notifier = {
2326 .notifier_call = afiucv_netdev_event,
2327 };
2328
2329 static const struct proto_ops iucv_sock_ops = {
2330 .family = PF_IUCV,
2331 .owner = THIS_MODULE,
2332 .release = iucv_sock_release,
2333 .bind = iucv_sock_bind,
2334 .connect = iucv_sock_connect,
2335 .listen = iucv_sock_listen,
2336 .accept = iucv_sock_accept,
2337 .getname = iucv_sock_getname,
2338 .sendmsg = iucv_sock_sendmsg,
2339 .recvmsg = iucv_sock_recvmsg,
2340 .poll = iucv_sock_poll,
2341 .ioctl = sock_no_ioctl,
2342 .mmap = sock_no_mmap,
2343 .socketpair = sock_no_socketpair,
2344 .shutdown = iucv_sock_shutdown,
2345 .setsockopt = iucv_sock_setsockopt,
2346 .getsockopt = iucv_sock_getsockopt,
2347 };
2348
2349 static const struct net_proto_family iucv_sock_family_ops = {
2350 .family = AF_IUCV,
2351 .owner = THIS_MODULE,
2352 .create = iucv_sock_create,
2353 };
2354
2355 static struct packet_type iucv_packet_type = {
2356 .type = cpu_to_be16(ETH_P_AF_IUCV),
2357 .func = afiucv_hs_rcv,
2358 };
2359
2360 static int afiucv_iucv_init(void)
2361 {
2362 int err;
2363
2364 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2365 if (err)
2366 goto out;
2367 /* establish dummy device */
2368 af_iucv_driver.bus = pr_iucv->bus;
2369 err = driver_register(&af_iucv_driver);
2370 if (err)
2371 goto out_iucv;
2372 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2373 if (!af_iucv_dev) {
2374 err = -ENOMEM;
2375 goto out_driver;
2376 }
2377 dev_set_name(af_iucv_dev, "af_iucv");
2378 af_iucv_dev->bus = pr_iucv->bus;
2379 af_iucv_dev->parent = pr_iucv->root;
2380 af_iucv_dev->release = (void (*)(struct device *))kfree;
2381 af_iucv_dev->driver = &af_iucv_driver;
2382 err = device_register(af_iucv_dev);
2383 if (err)
2384 goto out_driver;
2385 return 0;
2386
2387 out_driver:
2388 driver_unregister(&af_iucv_driver);
2389 out_iucv:
2390 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2391 out:
2392 return err;
2393 }
2394
2395 static int __init afiucv_init(void)
2396 {
2397 int err;
2398
2399 if (MACHINE_IS_VM) {
2400 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2401 if (unlikely(err)) {
2402 WARN_ON(err);
2403 err = -EPROTONOSUPPORT;
2404 goto out;
2405 }
2406
2407 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2408 if (!pr_iucv) {
2409 printk(KERN_WARNING "iucv_if lookup failed\n");
2410 memset(&iucv_userid, 0, sizeof(iucv_userid));
2411 }
2412 } else {
2413 memset(&iucv_userid, 0, sizeof(iucv_userid));
2414 pr_iucv = NULL;
2415 }
2416
2417 err = proto_register(&iucv_proto, 0);
2418 if (err)
2419 goto out;
2420 err = sock_register(&iucv_sock_family_ops);
2421 if (err)
2422 goto out_proto;
2423
2424 if (pr_iucv) {
2425 err = afiucv_iucv_init();
2426 if (err)
2427 goto out_sock;
2428 } else
2429 register_netdevice_notifier(&afiucv_netdev_notifier);
2430 dev_add_pack(&iucv_packet_type);
2431 return 0;
2432
2433 out_sock:
2434 sock_unregister(PF_IUCV);
2435 out_proto:
2436 proto_unregister(&iucv_proto);
2437 out:
2438 if (pr_iucv)
2439 symbol_put(iucv_if);
2440 return err;
2441 }
2442
2443 static void __exit afiucv_exit(void)
2444 {
2445 if (pr_iucv) {
2446 device_unregister(af_iucv_dev);
2447 driver_unregister(&af_iucv_driver);
2448 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2449 symbol_put(iucv_if);
2450 } else
2451 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2452 dev_remove_pack(&iucv_packet_type);
2453 sock_unregister(PF_IUCV);
2454 proto_unregister(&iucv_proto);
2455 }
2456
2457 module_init(afiucv_init);
2458 module_exit(afiucv_exit);
2459
2460 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2461 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2462 MODULE_VERSION(VERSION);
2463 MODULE_LICENSE("GPL");
2464 MODULE_ALIAS_NETPROTO(PF_IUCV);
2465
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