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TPM: Zero buffer whole after copying to userspace
[linux/fpc-iii.git] / net / iucv / af_iucv.c
blobd5c5b8fd1d01e50f2c9a928809184b28e77ea4bd
1 /*
2 * IUCV protocol stack for Linux on zSeries
3 *
4 * Copyright IBM Corp. 2006, 2009
5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
25 #include <net/sock.h>
26 #include <asm/ebcdic.h>
27 #include <asm/cpcmd.h>
28 #include <linux/kmod.h>
29
30 #include <net/iucv/af_iucv.h>
31
32 #define VERSION "1.2"
33
34 static char iucv_userid[80];
35
36 static const struct proto_ops iucv_sock_ops;
37
38 static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42 };
43
44 static struct iucv_interface *pr_iucv;
45
46 /* special AF_IUCV IPRM messages */
47 static const u8 iprm_shutdown[8] =
48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
49
50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
51
52 /* macros to set/get socket control buffer at correct offset */
53 #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */
54 #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag))
55 #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
56 #define CB_TRGCLS_LEN (TRGCLS_SIZE)
57
58 #define __iucv_sock_wait(sk, condition, timeo, ret) \
59 do { \
60 DEFINE_WAIT(__wait); \
61 long __timeo = timeo; \
62 ret = 0; \
63 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
64 while (!(condition)) { \
65 if (!__timeo) { \
66 ret = -EAGAIN; \
67 break; \
68 } \
69 if (signal_pending(current)) { \
70 ret = sock_intr_errno(__timeo); \
71 break; \
72 } \
73 release_sock(sk); \
74 __timeo = schedule_timeout(__timeo); \
75 lock_sock(sk); \
76 ret = sock_error(sk); \
77 if (ret) \
78 break; \
79 } \
80 finish_wait(sk_sleep(sk), &__wait); \
81 } while (0)
82
83 #define iucv_sock_wait(sk, condition, timeo) \
84 ({ \
85 int __ret = 0; \
86 if (!(condition)) \
87 __iucv_sock_wait(sk, condition, timeo, __ret); \
88 __ret; \
89 })
90
91 static void iucv_sock_kill(struct sock *sk);
92 static void iucv_sock_close(struct sock *sk);
93
94 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
95 struct packet_type *pt, struct net_device *orig_dev);
96 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
97 struct sk_buff *skb, u8 flags);
98 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
99
100 /* Call Back functions */
101 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
102 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
103 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
104 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
105 u8 ipuser[16]);
106 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
107 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
108
109 static struct iucv_sock_list iucv_sk_list = {
110 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
111 .autobind_name = ATOMIC_INIT(0)
112 };
113
114 static struct iucv_handler af_iucv_handler = {
115 .path_pending = iucv_callback_connreq,
116 .path_complete = iucv_callback_connack,
117 .path_severed = iucv_callback_connrej,
118 .message_pending = iucv_callback_rx,
119 .message_complete = iucv_callback_txdone,
120 .path_quiesced = iucv_callback_shutdown,
121 };
122
123 static inline void high_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(dst, src, 8);
126 }
127
128 static inline void low_nmcpy(unsigned char *dst, char *src)
129 {
130 memcpy(&dst[8], src, 8);
131 }
132
133 static void iucv_skb_queue_purge(struct sk_buff_head *list)
134 {
135 struct sk_buff *skb;
136
137 while ((skb = skb_dequeue(list)) != NULL) {
138 if (skb->dev)
139 dev_put(skb->dev);
140 kfree_skb(skb);
141 }
142 }
143
144 static int afiucv_pm_prepare(struct device *dev)
145 {
146 #ifdef CONFIG_PM_DEBUG
147 printk(KERN_WARNING "afiucv_pm_prepare\n");
148 #endif
149 return 0;
150 }
151
152 static void afiucv_pm_complete(struct device *dev)
153 {
154 #ifdef CONFIG_PM_DEBUG
155 printk(KERN_WARNING "afiucv_pm_complete\n");
156 #endif
157 }
158
159 /**
160 * afiucv_pm_freeze() - Freeze PM callback
161 * @dev: AFIUCV dummy device
162 *
163 * Sever all established IUCV communication pathes
164 */
165 static int afiucv_pm_freeze(struct device *dev)
166 {
167 struct iucv_sock *iucv;
168 struct sock *sk;
169 struct hlist_node *node;
170 int err = 0;
171
172 #ifdef CONFIG_PM_DEBUG
173 printk(KERN_WARNING "afiucv_pm_freeze\n");
174 #endif
175 read_lock(&iucv_sk_list.lock);
176 sk_for_each(sk, node, &iucv_sk_list.head) {
177 iucv = iucv_sk(sk);
178 iucv_skb_queue_purge(&iucv->send_skb_q);
179 skb_queue_purge(&iucv->backlog_skb_q);
180 switch (sk->sk_state) {
181 case IUCV_DISCONN:
182 case IUCV_CLOSING:
183 case IUCV_CONNECTED:
184 if (iucv->path) {
185 err = pr_iucv->path_sever(iucv->path, NULL);
186 iucv_path_free(iucv->path);
187 iucv->path = NULL;
188 }
189 break;
190 case IUCV_OPEN:
191 case IUCV_BOUND:
192 case IUCV_LISTEN:
193 case IUCV_CLOSED:
194 default:
195 break;
196 }
197 }
198 read_unlock(&iucv_sk_list.lock);
199 return err;
200 }
201
202 /**
203 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
204 * @dev: AFIUCV dummy device
205 *
206 * socket clean up after freeze
207 */
208 static int afiucv_pm_restore_thaw(struct device *dev)
209 {
210 struct sock *sk;
211 struct hlist_node *node;
212
213 #ifdef CONFIG_PM_DEBUG
214 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
215 #endif
216 read_lock(&iucv_sk_list.lock);
217 sk_for_each(sk, node, &iucv_sk_list.head) {
218 switch (sk->sk_state) {
219 case IUCV_CONNECTED:
220 sk->sk_err = EPIPE;
221 sk->sk_state = IUCV_DISCONN;
222 sk->sk_state_change(sk);
223 break;
224 case IUCV_DISCONN:
225 case IUCV_CLOSING:
226 case IUCV_LISTEN:
227 case IUCV_BOUND:
228 case IUCV_OPEN:
229 default:
230 break;
231 }
232 }
233 read_unlock(&iucv_sk_list.lock);
234 return 0;
235 }
236
237 static const struct dev_pm_ops afiucv_pm_ops = {
238 .prepare = afiucv_pm_prepare,
239 .complete = afiucv_pm_complete,
240 .freeze = afiucv_pm_freeze,
241 .thaw = afiucv_pm_restore_thaw,
242 .restore = afiucv_pm_restore_thaw,
243 };
244
245 static struct device_driver af_iucv_driver = {
246 .owner = THIS_MODULE,
247 .name = "afiucv",
248 .bus = NULL,
249 .pm = &afiucv_pm_ops,
250 };
251
252 /* dummy device used as trigger for PM functions */
253 static struct device *af_iucv_dev;
254
255 /**
256 * iucv_msg_length() - Returns the length of an iucv message.
257 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
258 *
259 * The function returns the length of the specified iucv message @msg of data
260 * stored in a buffer and of data stored in the parameter list (PRMDATA).
261 *
262 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
263 * data:
264 * PRMDATA[0..6] socket data (max 7 bytes);
265 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
266 *
267 * The socket data length is computed by subtracting the socket data length
268 * value from 0xFF.
269 * If the socket data len is greater 7, then PRMDATA can be used for special
270 * notifications (see iucv_sock_shutdown); and further,
271 * if the socket data len is > 7, the function returns 8.
272 *
273 * Use this function to allocate socket buffers to store iucv message data.
274 */
275 static inline size_t iucv_msg_length(struct iucv_message *msg)
276 {
277 size_t datalen;
278
279 if (msg->flags & IUCV_IPRMDATA) {
280 datalen = 0xff - msg->rmmsg[7];
281 return (datalen < 8) ? datalen : 8;
282 }
283 return msg->length;
284 }
285
286 /**
287 * iucv_sock_in_state() - check for specific states
288 * @sk: sock structure
289 * @state: first iucv sk state
290 * @state: second iucv sk state
291 *
292 * Returns true if the socket in either in the first or second state.
293 */
294 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
295 {
296 return (sk->sk_state == state || sk->sk_state == state2);
297 }
298
299 /**
300 * iucv_below_msglim() - function to check if messages can be sent
301 * @sk: sock structure
302 *
303 * Returns true if the send queue length is lower than the message limit.
304 * Always returns true if the socket is not connected (no iucv path for
305 * checking the message limit).
306 */
307 static inline int iucv_below_msglim(struct sock *sk)
308 {
309 struct iucv_sock *iucv = iucv_sk(sk);
310
311 if (sk->sk_state != IUCV_CONNECTED)
312 return 1;
313 if (iucv->transport == AF_IUCV_TRANS_IUCV)
314 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
315 else
316 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
317 (atomic_read(&iucv->pendings) <= 0));
318 }
319
320 /**
321 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
322 */
323 static void iucv_sock_wake_msglim(struct sock *sk)
324 {
325 struct socket_wq *wq;
326
327 rcu_read_lock();
328 wq = rcu_dereference(sk->sk_wq);
329 if (wq_has_sleeper(wq))
330 wake_up_interruptible_all(&wq->wait);
331 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
332 rcu_read_unlock();
333 }
334
335 /**
336 * afiucv_hs_send() - send a message through HiperSockets transport
337 */
338 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
339 struct sk_buff *skb, u8 flags)
340 {
341 struct net *net = sock_net(sock);
342 struct iucv_sock *iucv = iucv_sk(sock);
343 struct af_iucv_trans_hdr *phs_hdr;
344 struct sk_buff *nskb;
345 int err, confirm_recv = 0;
346
347 memset(skb->head, 0, ETH_HLEN);
348 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
349 sizeof(struct af_iucv_trans_hdr));
350 skb_reset_mac_header(skb);
351 skb_reset_network_header(skb);
352 skb_push(skb, ETH_HLEN);
353 skb_reset_mac_header(skb);
354 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
355
356 phs_hdr->magic = ETH_P_AF_IUCV;
357 phs_hdr->version = 1;
358 phs_hdr->flags = flags;
359 if (flags == AF_IUCV_FLAG_SYN)
360 phs_hdr->window = iucv->msglimit;
361 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
362 confirm_recv = atomic_read(&iucv->msg_recv);
363 phs_hdr->window = confirm_recv;
364 if (confirm_recv)
365 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
366 }
367 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
368 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
369 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
370 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
371 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
372 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
373 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
374 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
375 if (imsg)
376 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
377
378 skb->dev = dev_get_by_index(net, sock->sk_bound_dev_if);
379 if (!skb->dev)
380 return -ENODEV;
381 if (!(skb->dev->flags & IFF_UP))
382 return -ENETDOWN;
383 if (skb->len > skb->dev->mtu) {
384 if (sock->sk_type == SOCK_SEQPACKET)
385 return -EMSGSIZE;
386 else
387 skb_trim(skb, skb->dev->mtu);
388 }
389 skb->protocol = ETH_P_AF_IUCV;
390 skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF;
391 nskb = skb_clone(skb, GFP_ATOMIC);
392 if (!nskb)
393 return -ENOMEM;
394 skb_queue_tail(&iucv->send_skb_q, nskb);
395 err = dev_queue_xmit(skb);
396 if (err) {
397 skb_unlink(nskb, &iucv->send_skb_q);
398 dev_put(nskb->dev);
399 kfree_skb(nskb);
400 } else {
401 atomic_sub(confirm_recv, &iucv->msg_recv);
402 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
403 }
404 return err;
405 }
406
407 static struct sock *__iucv_get_sock_by_name(char *nm)
408 {
409 struct sock *sk;
410 struct hlist_node *node;
411
412 sk_for_each(sk, node, &iucv_sk_list.head)
413 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
414 return sk;
415
416 return NULL;
417 }
418
419 static void iucv_sock_destruct(struct sock *sk)
420 {
421 skb_queue_purge(&sk->sk_receive_queue);
422 skb_queue_purge(&sk->sk_write_queue);
423 }
424
425 /* Cleanup Listen */
426 static void iucv_sock_cleanup_listen(struct sock *parent)
427 {
428 struct sock *sk;
429
430 /* Close non-accepted connections */
431 while ((sk = iucv_accept_dequeue(parent, NULL))) {
432 iucv_sock_close(sk);
433 iucv_sock_kill(sk);
434 }
435
436 parent->sk_state = IUCV_CLOSED;
437 }
438
439 /* Kill socket (only if zapped and orphaned) */
440 static void iucv_sock_kill(struct sock *sk)
441 {
442 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
443 return;
444
445 iucv_sock_unlink(&iucv_sk_list, sk);
446 sock_set_flag(sk, SOCK_DEAD);
447 sock_put(sk);
448 }
449
450 /* Close an IUCV socket */
451 static void iucv_sock_close(struct sock *sk)
452 {
453 unsigned char user_data[16];
454 struct iucv_sock *iucv = iucv_sk(sk);
455 unsigned long timeo;
456 int err, blen;
457 struct sk_buff *skb;
458
459 lock_sock(sk);
460
461 switch (sk->sk_state) {
462 case IUCV_LISTEN:
463 iucv_sock_cleanup_listen(sk);
464 break;
465
466 case IUCV_CONNECTED:
467 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
468 /* send fin */
469 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
470 skb = sock_alloc_send_skb(sk, blen, 1, &err);
471 if (skb) {
472 skb_reserve(skb, blen);
473 err = afiucv_hs_send(NULL, sk, skb,
474 AF_IUCV_FLAG_FIN);
475 }
476 sk->sk_state = IUCV_DISCONN;
477 sk->sk_state_change(sk);
478 }
479 case IUCV_DISCONN: /* fall through */
480 sk->sk_state = IUCV_CLOSING;
481 sk->sk_state_change(sk);
482
483 if (!skb_queue_empty(&iucv->send_skb_q)) {
484 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
485 timeo = sk->sk_lingertime;
486 else
487 timeo = IUCV_DISCONN_TIMEOUT;
488 iucv_sock_wait(sk,
489 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
490 timeo);
491 }
492
493 case IUCV_CLOSING: /* fall through */
494 sk->sk_state = IUCV_CLOSED;
495 sk->sk_state_change(sk);
496
497 if (iucv->path) {
498 low_nmcpy(user_data, iucv->src_name);
499 high_nmcpy(user_data, iucv->dst_name);
500 ASCEBC(user_data, sizeof(user_data));
501 pr_iucv->path_sever(iucv->path, user_data);
502 iucv_path_free(iucv->path);
503 iucv->path = NULL;
504 }
505
506 sk->sk_err = ECONNRESET;
507 sk->sk_state_change(sk);
508
509 iucv_skb_queue_purge(&iucv->send_skb_q);
510 skb_queue_purge(&iucv->backlog_skb_q);
511 break;
512
513 default:
514 /* nothing to do here */
515 break;
516 }
517
518 /* mark socket for deletion by iucv_sock_kill() */
519 sock_set_flag(sk, SOCK_ZAPPED);
520
521 release_sock(sk);
522 }
523
524 static void iucv_sock_init(struct sock *sk, struct sock *parent)
525 {
526 if (parent)
527 sk->sk_type = parent->sk_type;
528 }
529
530 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
531 {
532 struct sock *sk;
533 struct iucv_sock *iucv;
534
535 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
536 if (!sk)
537 return NULL;
538 iucv = iucv_sk(sk);
539
540 sock_init_data(sock, sk);
541 INIT_LIST_HEAD(&iucv->accept_q);
542 spin_lock_init(&iucv->accept_q_lock);
543 skb_queue_head_init(&iucv->send_skb_q);
544 INIT_LIST_HEAD(&iucv->message_q.list);
545 spin_lock_init(&iucv->message_q.lock);
546 skb_queue_head_init(&iucv->backlog_skb_q);
547 iucv->send_tag = 0;
548 atomic_set(&iucv->pendings, 0);
549 iucv->flags = 0;
550 iucv->msglimit = 0;
551 atomic_set(&iucv->msg_sent, 0);
552 atomic_set(&iucv->msg_recv, 0);
553 iucv->path = NULL;
554 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
555 memset(&iucv->src_user_id , 0, 32);
556 if (pr_iucv)
557 iucv->transport = AF_IUCV_TRANS_IUCV;
558 else
559 iucv->transport = AF_IUCV_TRANS_HIPER;
560
561 sk->sk_destruct = iucv_sock_destruct;
562 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
563 sk->sk_allocation = GFP_DMA;
564
565 sock_reset_flag(sk, SOCK_ZAPPED);
566
567 sk->sk_protocol = proto;
568 sk->sk_state = IUCV_OPEN;
569
570 iucv_sock_link(&iucv_sk_list, sk);
571 return sk;
572 }
573
574 /* Create an IUCV socket */
575 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
576 int kern)
577 {
578 struct sock *sk;
579
580 if (protocol && protocol != PF_IUCV)
581 return -EPROTONOSUPPORT;
582
583 sock->state = SS_UNCONNECTED;
584
585 switch (sock->type) {
586 case SOCK_STREAM:
587 sock->ops = &iucv_sock_ops;
588 break;
589 case SOCK_SEQPACKET:
590 /* currently, proto ops can handle both sk types */
591 sock->ops = &iucv_sock_ops;
592 break;
593 default:
594 return -ESOCKTNOSUPPORT;
595 }
596
597 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
598 if (!sk)
599 return -ENOMEM;
600
601 iucv_sock_init(sk, NULL);
602
603 return 0;
604 }
605
606 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
607 {
608 write_lock_bh(&l->lock);
609 sk_add_node(sk, &l->head);
610 write_unlock_bh(&l->lock);
611 }
612
613 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
614 {
615 write_lock_bh(&l->lock);
616 sk_del_node_init(sk);
617 write_unlock_bh(&l->lock);
618 }
619
620 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
621 {
622 unsigned long flags;
623 struct iucv_sock *par = iucv_sk(parent);
624
625 sock_hold(sk);
626 spin_lock_irqsave(&par->accept_q_lock, flags);
627 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
628 spin_unlock_irqrestore(&par->accept_q_lock, flags);
629 iucv_sk(sk)->parent = parent;
630 sk_acceptq_added(parent);
631 }
632
633 void iucv_accept_unlink(struct sock *sk)
634 {
635 unsigned long flags;
636 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
637
638 spin_lock_irqsave(&par->accept_q_lock, flags);
639 list_del_init(&iucv_sk(sk)->accept_q);
640 spin_unlock_irqrestore(&par->accept_q_lock, flags);
641 sk_acceptq_removed(iucv_sk(sk)->parent);
642 iucv_sk(sk)->parent = NULL;
643 sock_put(sk);
644 }
645
646 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
647 {
648 struct iucv_sock *isk, *n;
649 struct sock *sk;
650
651 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
652 sk = (struct sock *) isk;
653 lock_sock(sk);
654
655 if (sk->sk_state == IUCV_CLOSED) {
656 iucv_accept_unlink(sk);
657 release_sock(sk);
658 continue;
659 }
660
661 if (sk->sk_state == IUCV_CONNECTED ||
662 sk->sk_state == IUCV_DISCONN ||
663 !newsock) {
664 iucv_accept_unlink(sk);
665 if (newsock)
666 sock_graft(sk, newsock);
667
668 release_sock(sk);
669 return sk;
670 }
671
672 release_sock(sk);
673 }
674 return NULL;
675 }
676
677 /* Bind an unbound socket */
678 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
679 int addr_len)
680 {
681 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
682 struct sock *sk = sock->sk;
683 struct iucv_sock *iucv;
684 int err = 0;
685 struct net_device *dev;
686 char uid[9];
687
688 /* Verify the input sockaddr */
689 if (!addr || addr->sa_family != AF_IUCV)
690 return -EINVAL;
691
692 lock_sock(sk);
693 if (sk->sk_state != IUCV_OPEN) {
694 err = -EBADFD;
695 goto done;
696 }
697
698 write_lock_bh(&iucv_sk_list.lock);
699
700 iucv = iucv_sk(sk);
701 if (__iucv_get_sock_by_name(sa->siucv_name)) {
702 err = -EADDRINUSE;
703 goto done_unlock;
704 }
705 if (iucv->path)
706 goto done_unlock;
707
708 /* Bind the socket */
709
710 if (pr_iucv)
711 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
712 goto vm_bind; /* VM IUCV transport */
713
714 /* try hiper transport */
715 memcpy(uid, sa->siucv_user_id, sizeof(uid));
716 ASCEBC(uid, 8);
717 rcu_read_lock();
718 for_each_netdev_rcu(&init_net, dev) {
719 if (!memcmp(dev->perm_addr, uid, 8)) {
720 memcpy(iucv->src_name, sa->siucv_name, 8);
721 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
722 sk->sk_bound_dev_if = dev->ifindex;
723 sk->sk_state = IUCV_BOUND;
724 iucv->transport = AF_IUCV_TRANS_HIPER;
725 if (!iucv->msglimit)
726 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
727 rcu_read_unlock();
728 goto done_unlock;
729 }
730 }
731 rcu_read_unlock();
732 vm_bind:
733 if (pr_iucv) {
734 /* use local userid for backward compat */
735 memcpy(iucv->src_name, sa->siucv_name, 8);
736 memcpy(iucv->src_user_id, iucv_userid, 8);
737 sk->sk_state = IUCV_BOUND;
738 iucv->transport = AF_IUCV_TRANS_IUCV;
739 if (!iucv->msglimit)
740 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
741 goto done_unlock;
742 }
743 /* found no dev to bind */
744 err = -ENODEV;
745 done_unlock:
746 /* Release the socket list lock */
747 write_unlock_bh(&iucv_sk_list.lock);
748 done:
749 release_sock(sk);
750 return err;
751 }
752
753 /* Automatically bind an unbound socket */
754 static int iucv_sock_autobind(struct sock *sk)
755 {
756 struct iucv_sock *iucv = iucv_sk(sk);
757 char name[12];
758 int err = 0;
759
760 if (unlikely(!pr_iucv))
761 return -EPROTO;
762
763 memcpy(iucv->src_user_id, iucv_userid, 8);
764
765 write_lock_bh(&iucv_sk_list.lock);
766
767 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
768 while (__iucv_get_sock_by_name(name)) {
769 sprintf(name, "%08x",
770 atomic_inc_return(&iucv_sk_list.autobind_name));
771 }
772
773 write_unlock_bh(&iucv_sk_list.lock);
774
775 memcpy(&iucv->src_name, name, 8);
776
777 if (!iucv->msglimit)
778 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
779
780 return err;
781 }
782
783 static int afiucv_hs_connect(struct socket *sock)
784 {
785 struct sock *sk = sock->sk;
786 struct sk_buff *skb;
787 int blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
788 int err = 0;
789
790 /* send syn */
791 skb = sock_alloc_send_skb(sk, blen, 1, &err);
792 if (!skb) {
793 err = -ENOMEM;
794 goto done;
795 }
796 skb->dev = NULL;
797 skb_reserve(skb, blen);
798 err = afiucv_hs_send(NULL, sk, skb, AF_IUCV_FLAG_SYN);
799 done:
800 return err;
801 }
802
803 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
804 {
805 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
806 struct sock *sk = sock->sk;
807 struct iucv_sock *iucv = iucv_sk(sk);
808 unsigned char user_data[16];
809 int err;
810
811 high_nmcpy(user_data, sa->siucv_name);
812 low_nmcpy(user_data, iucv->src_name);
813 ASCEBC(user_data, sizeof(user_data));
814
815 /* Create path. */
816 iucv->path = iucv_path_alloc(iucv->msglimit,
817 IUCV_IPRMDATA, GFP_KERNEL);
818 if (!iucv->path) {
819 err = -ENOMEM;
820 goto done;
821 }
822 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
823 sa->siucv_user_id, NULL, user_data,
824 sk);
825 if (err) {
826 iucv_path_free(iucv->path);
827 iucv->path = NULL;
828 switch (err) {
829 case 0x0b: /* Target communicator is not logged on */
830 err = -ENETUNREACH;
831 break;
832 case 0x0d: /* Max connections for this guest exceeded */
833 case 0x0e: /* Max connections for target guest exceeded */
834 err = -EAGAIN;
835 break;
836 case 0x0f: /* Missing IUCV authorization */
837 err = -EACCES;
838 break;
839 default:
840 err = -ECONNREFUSED;
841 break;
842 }
843 }
844 done:
845 return err;
846 }
847
848 /* Connect an unconnected socket */
849 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
850 int alen, int flags)
851 {
852 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
853 struct sock *sk = sock->sk;
854 struct iucv_sock *iucv = iucv_sk(sk);
855 int err;
856
857 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
858 return -EINVAL;
859
860 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
861 return -EBADFD;
862
863 if (sk->sk_state == IUCV_OPEN &&
864 iucv->transport == AF_IUCV_TRANS_HIPER)
865 return -EBADFD; /* explicit bind required */
866
867 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
868 return -EINVAL;
869
870 if (sk->sk_state == IUCV_OPEN) {
871 err = iucv_sock_autobind(sk);
872 if (unlikely(err))
873 return err;
874 }
875
876 lock_sock(sk);
877
878 /* Set the destination information */
879 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
880 memcpy(iucv->dst_name, sa->siucv_name, 8);
881
882 if (iucv->transport == AF_IUCV_TRANS_HIPER)
883 err = afiucv_hs_connect(sock);
884 else
885 err = afiucv_path_connect(sock, addr);
886 if (err)
887 goto done;
888
889 if (sk->sk_state != IUCV_CONNECTED)
890 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
891 IUCV_DISCONN),
892 sock_sndtimeo(sk, flags & O_NONBLOCK));
893
894 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
895 err = -ECONNREFUSED;
896
897 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) {
898 pr_iucv->path_sever(iucv->path, NULL);
899 iucv_path_free(iucv->path);
900 iucv->path = NULL;
901 }
902
903 done:
904 release_sock(sk);
905 return err;
906 }
907
908 /* Move a socket into listening state. */
909 static int iucv_sock_listen(struct socket *sock, int backlog)
910 {
911 struct sock *sk = sock->sk;
912 int err;
913
914 lock_sock(sk);
915
916 err = -EINVAL;
917 if (sk->sk_state != IUCV_BOUND)
918 goto done;
919
920 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
921 goto done;
922
923 sk->sk_max_ack_backlog = backlog;
924 sk->sk_ack_backlog = 0;
925 sk->sk_state = IUCV_LISTEN;
926 err = 0;
927
928 done:
929 release_sock(sk);
930 return err;
931 }
932
933 /* Accept a pending connection */
934 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
935 int flags)
936 {
937 DECLARE_WAITQUEUE(wait, current);
938 struct sock *sk = sock->sk, *nsk;
939 long timeo;
940 int err = 0;
941
942 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
943
944 if (sk->sk_state != IUCV_LISTEN) {
945 err = -EBADFD;
946 goto done;
947 }
948
949 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
950
951 /* Wait for an incoming connection */
952 add_wait_queue_exclusive(sk_sleep(sk), &wait);
953 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
954 set_current_state(TASK_INTERRUPTIBLE);
955 if (!timeo) {
956 err = -EAGAIN;
957 break;
958 }
959
960 release_sock(sk);
961 timeo = schedule_timeout(timeo);
962 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
963
964 if (sk->sk_state != IUCV_LISTEN) {
965 err = -EBADFD;
966 break;
967 }
968
969 if (signal_pending(current)) {
970 err = sock_intr_errno(timeo);
971 break;
972 }
973 }
974
975 set_current_state(TASK_RUNNING);
976 remove_wait_queue(sk_sleep(sk), &wait);
977
978 if (err)
979 goto done;
980
981 newsock->state = SS_CONNECTED;
982
983 done:
984 release_sock(sk);
985 return err;
986 }
987
988 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
989 int *len, int peer)
990 {
991 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
992 struct sock *sk = sock->sk;
993 struct iucv_sock *iucv = iucv_sk(sk);
994
995 addr->sa_family = AF_IUCV;
996 *len = sizeof(struct sockaddr_iucv);
997
998 if (peer) {
999 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1000 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1001 } else {
1002 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1003 memcpy(siucv->siucv_name, iucv->src_name, 8);
1004 }
1005 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1006 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1007 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1008
1009 return 0;
1010 }
1011
1012 /**
1013 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1014 * @path: IUCV path
1015 * @msg: Pointer to a struct iucv_message
1016 * @skb: The socket data to send, skb->len MUST BE <= 7
1017 *
1018 * Send the socket data in the parameter list in the iucv message
1019 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1020 * list and the socket data len at index 7 (last byte).
1021 * See also iucv_msg_length().
1022 *
1023 * Returns the error code from the iucv_message_send() call.
1024 */
1025 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1026 struct sk_buff *skb)
1027 {
1028 u8 prmdata[8];
1029
1030 memcpy(prmdata, (void *) skb->data, skb->len);
1031 prmdata[7] = 0xff - (u8) skb->len;
1032 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1033 (void *) prmdata, 8);
1034 }
1035
1036 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1037 struct msghdr *msg, size_t len)
1038 {
1039 struct sock *sk = sock->sk;
1040 struct iucv_sock *iucv = iucv_sk(sk);
1041 struct sk_buff *skb;
1042 struct iucv_message txmsg;
1043 struct cmsghdr *cmsg;
1044 int cmsg_done;
1045 long timeo;
1046 char user_id[9];
1047 char appl_id[9];
1048 int err;
1049 int noblock = msg->msg_flags & MSG_DONTWAIT;
1050
1051 err = sock_error(sk);
1052 if (err)
1053 return err;
1054
1055 if (msg->msg_flags & MSG_OOB)
1056 return -EOPNOTSUPP;
1057
1058 /* SOCK_SEQPACKET: we do not support segmented records */
1059 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1060 return -EOPNOTSUPP;
1061
1062 lock_sock(sk);
1063
1064 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1065 err = -EPIPE;
1066 goto out;
1067 }
1068
1069 /* Return if the socket is not in connected state */
1070 if (sk->sk_state != IUCV_CONNECTED) {
1071 err = -ENOTCONN;
1072 goto out;
1073 }
1074
1075 /* initialize defaults */
1076 cmsg_done = 0; /* check for duplicate headers */
1077 txmsg.class = 0;
1078
1079 /* iterate over control messages */
1080 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
1081 cmsg = CMSG_NXTHDR(msg, cmsg)) {
1082
1083 if (!CMSG_OK(msg, cmsg)) {
1084 err = -EINVAL;
1085 goto out;
1086 }
1087
1088 if (cmsg->cmsg_level != SOL_IUCV)
1089 continue;
1090
1091 if (cmsg->cmsg_type & cmsg_done) {
1092 err = -EINVAL;
1093 goto out;
1094 }
1095 cmsg_done |= cmsg->cmsg_type;
1096
1097 switch (cmsg->cmsg_type) {
1098 case SCM_IUCV_TRGCLS:
1099 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1100 err = -EINVAL;
1101 goto out;
1102 }
1103
1104 /* set iucv message target class */
1105 memcpy(&txmsg.class,
1106 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1107
1108 break;
1109
1110 default:
1111 err = -EINVAL;
1112 goto out;
1113 break;
1114 }
1115 }
1116
1117 /* allocate one skb for each iucv message:
1118 * this is fine for SOCK_SEQPACKET (unless we want to support
1119 * segmented records using the MSG_EOR flag), but
1120 * for SOCK_STREAM we might want to improve it in future */
1121 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1122 skb = sock_alloc_send_skb(sk,
1123 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1124 noblock, &err);
1125 else
1126 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1127 if (!skb)
1128 goto out;
1129 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1130 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1131 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1132 err = -EFAULT;
1133 goto fail;
1134 }
1135
1136 /* wait if outstanding messages for iucv path has reached */
1137 timeo = sock_sndtimeo(sk, noblock);
1138 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1139 if (err)
1140 goto fail;
1141
1142 /* return -ECONNRESET if the socket is no longer connected */
1143 if (sk->sk_state != IUCV_CONNECTED) {
1144 err = -ECONNRESET;
1145 goto fail;
1146 }
1147
1148 /* increment and save iucv message tag for msg_completion cbk */
1149 txmsg.tag = iucv->send_tag++;
1150 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
1151 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1152 atomic_inc(&iucv->msg_sent);
1153 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1154 if (err) {
1155 atomic_dec(&iucv->msg_sent);
1156 goto fail;
1157 }
1158 goto release;
1159 }
1160 skb_queue_tail(&iucv->send_skb_q, skb);
1161
1162 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1163 && skb->len <= 7) {
1164 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1165
1166 /* on success: there is no message_complete callback
1167 * for an IPRMDATA msg; remove skb from send queue */
1168 if (err == 0) {
1169 skb_unlink(skb, &iucv->send_skb_q);
1170 kfree_skb(skb);
1171 }
1172
1173 /* this error should never happen since the
1174 * IUCV_IPRMDATA path flag is set... sever path */
1175 if (err == 0x15) {
1176 pr_iucv->path_sever(iucv->path, NULL);
1177 skb_unlink(skb, &iucv->send_skb_q);
1178 err = -EPIPE;
1179 goto fail;
1180 }
1181 } else
1182 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1183 (void *) skb->data, skb->len);
1184 if (err) {
1185 if (err == 3) {
1186 user_id[8] = 0;
1187 memcpy(user_id, iucv->dst_user_id, 8);
1188 appl_id[8] = 0;
1189 memcpy(appl_id, iucv->dst_name, 8);
1190 pr_err("Application %s on z/VM guest %s"
1191 " exceeds message limit\n",
1192 appl_id, user_id);
1193 err = -EAGAIN;
1194 } else
1195 err = -EPIPE;
1196 skb_unlink(skb, &iucv->send_skb_q);
1197 goto fail;
1198 }
1199
1200 release:
1201 release_sock(sk);
1202 return len;
1203
1204 fail:
1205 if (skb->dev)
1206 dev_put(skb->dev);
1207 kfree_skb(skb);
1208 out:
1209 release_sock(sk);
1210 return err;
1211 }
1212
1213 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1214 *
1215 * Locking: must be called with message_q.lock held
1216 */
1217 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1218 {
1219 int dataleft, size, copied = 0;
1220 struct sk_buff *nskb;
1221
1222 dataleft = len;
1223 while (dataleft) {
1224 if (dataleft >= sk->sk_rcvbuf / 4)
1225 size = sk->sk_rcvbuf / 4;
1226 else
1227 size = dataleft;
1228
1229 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1230 if (!nskb)
1231 return -ENOMEM;
1232
1233 /* copy target class to control buffer of new skb */
1234 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1235
1236 /* copy data fragment */
1237 memcpy(nskb->data, skb->data + copied, size);
1238 copied += size;
1239 dataleft -= size;
1240
1241 skb_reset_transport_header(nskb);
1242 skb_reset_network_header(nskb);
1243 nskb->len = size;
1244
1245 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1246 }
1247
1248 return 0;
1249 }
1250
1251 /* iucv_process_message() - Receive a single outstanding IUCV message
1252 *
1253 * Locking: must be called with message_q.lock held
1254 */
1255 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1256 struct iucv_path *path,
1257 struct iucv_message *msg)
1258 {
1259 int rc;
1260 unsigned int len;
1261
1262 len = iucv_msg_length(msg);
1263
1264 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1265 /* Note: the first 4 bytes are reserved for msg tag */
1266 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1267
1268 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1269 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1270 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1271 skb->data = NULL;
1272 skb->len = 0;
1273 }
1274 } else {
1275 rc = pr_iucv->message_receive(path, msg,
1276 msg->flags & IUCV_IPRMDATA,
1277 skb->data, len, NULL);
1278 if (rc) {
1279 kfree_skb(skb);
1280 return;
1281 }
1282 /* we need to fragment iucv messages for SOCK_STREAM only;
1283 * for SOCK_SEQPACKET, it is only relevant if we support
1284 * record segmentation using MSG_EOR (see also recvmsg()) */
1285 if (sk->sk_type == SOCK_STREAM &&
1286 skb->truesize >= sk->sk_rcvbuf / 4) {
1287 rc = iucv_fragment_skb(sk, skb, len);
1288 kfree_skb(skb);
1289 skb = NULL;
1290 if (rc) {
1291 pr_iucv->path_sever(path, NULL);
1292 return;
1293 }
1294 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1295 } else {
1296 skb_reset_transport_header(skb);
1297 skb_reset_network_header(skb);
1298 skb->len = len;
1299 }
1300 }
1301
1302 if (sock_queue_rcv_skb(sk, skb))
1303 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1304 }
1305
1306 /* iucv_process_message_q() - Process outstanding IUCV messages
1307 *
1308 * Locking: must be called with message_q.lock held
1309 */
1310 static void iucv_process_message_q(struct sock *sk)
1311 {
1312 struct iucv_sock *iucv = iucv_sk(sk);
1313 struct sk_buff *skb;
1314 struct sock_msg_q *p, *n;
1315
1316 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1317 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1318 if (!skb)
1319 break;
1320 iucv_process_message(sk, skb, p->path, &p->msg);
1321 list_del(&p->list);
1322 kfree(p);
1323 if (!skb_queue_empty(&iucv->backlog_skb_q))
1324 break;
1325 }
1326 }
1327
1328 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1329 struct msghdr *msg, size_t len, int flags)
1330 {
1331 int noblock = flags & MSG_DONTWAIT;
1332 struct sock *sk = sock->sk;
1333 struct iucv_sock *iucv = iucv_sk(sk);
1334 unsigned int copied, rlen;
1335 struct sk_buff *skb, *rskb, *cskb, *sskb;
1336 int blen;
1337 int err = 0;
1338
1339 if ((sk->sk_state == IUCV_DISCONN) &&
1340 skb_queue_empty(&iucv->backlog_skb_q) &&
1341 skb_queue_empty(&sk->sk_receive_queue) &&
1342 list_empty(&iucv->message_q.list))
1343 return 0;
1344
1345 if (flags & (MSG_OOB))
1346 return -EOPNOTSUPP;
1347
1348 /* receive/dequeue next skb:
1349 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1350 skb = skb_recv_datagram(sk, flags, noblock, &err);
1351 if (!skb) {
1352 if (sk->sk_shutdown & RCV_SHUTDOWN)
1353 return 0;
1354 return err;
1355 }
1356
1357 rlen = skb->len; /* real length of skb */
1358 copied = min_t(unsigned int, rlen, len);
1359
1360 cskb = skb;
1361 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
1362 if (!(flags & MSG_PEEK))
1363 skb_queue_head(&sk->sk_receive_queue, skb);
1364 return -EFAULT;
1365 }
1366
1367 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1368 if (sk->sk_type == SOCK_SEQPACKET) {
1369 if (copied < rlen)
1370 msg->msg_flags |= MSG_TRUNC;
1371 /* each iucv message contains a complete record */
1372 msg->msg_flags |= MSG_EOR;
1373 }
1374
1375 /* create control message to store iucv msg target class:
1376 * get the trgcls from the control buffer of the skb due to
1377 * fragmentation of original iucv message. */
1378 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1379 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1380 if (err) {
1381 if (!(flags & MSG_PEEK))
1382 skb_queue_head(&sk->sk_receive_queue, skb);
1383 return err;
1384 }
1385
1386 /* Mark read part of skb as used */
1387 if (!(flags & MSG_PEEK)) {
1388
1389 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1390 if (sk->sk_type == SOCK_STREAM) {
1391 skb_pull(skb, copied);
1392 if (skb->len) {
1393 skb_queue_head(&sk->sk_receive_queue, skb);
1394 goto done;
1395 }
1396 }
1397
1398 kfree_skb(skb);
1399 atomic_inc(&iucv->msg_recv);
1400
1401 /* Queue backlog skbs */
1402 spin_lock_bh(&iucv->message_q.lock);
1403 rskb = skb_dequeue(&iucv->backlog_skb_q);
1404 while (rskb) {
1405 if (sock_queue_rcv_skb(sk, rskb)) {
1406 skb_queue_head(&iucv->backlog_skb_q,
1407 rskb);
1408 break;
1409 } else {
1410 rskb = skb_dequeue(&iucv->backlog_skb_q);
1411 }
1412 }
1413 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1414 if (!list_empty(&iucv->message_q.list))
1415 iucv_process_message_q(sk);
1416 if (atomic_read(&iucv->msg_recv) >=
1417 iucv->msglimit / 2) {
1418 /* send WIN to peer */
1419 blen = sizeof(struct af_iucv_trans_hdr) +
1420 ETH_HLEN;
1421 sskb = sock_alloc_send_skb(sk, blen, 1, &err);
1422 if (sskb) {
1423 skb_reserve(sskb, blen);
1424 err = afiucv_hs_send(NULL, sk, sskb,
1425 AF_IUCV_FLAG_WIN);
1426 }
1427 if (err) {
1428 sk->sk_state = IUCV_DISCONN;
1429 sk->sk_state_change(sk);
1430 }
1431 }
1432 }
1433 spin_unlock_bh(&iucv->message_q.lock);
1434 }
1435
1436 done:
1437 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1438 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1439 copied = rlen;
1440
1441 return copied;
1442 }
1443
1444 static inline unsigned int iucv_accept_poll(struct sock *parent)
1445 {
1446 struct iucv_sock *isk, *n;
1447 struct sock *sk;
1448
1449 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1450 sk = (struct sock *) isk;
1451
1452 if (sk->sk_state == IUCV_CONNECTED)
1453 return POLLIN | POLLRDNORM;
1454 }
1455
1456 return 0;
1457 }
1458
1459 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1460 poll_table *wait)
1461 {
1462 struct sock *sk = sock->sk;
1463 unsigned int mask = 0;
1464
1465 sock_poll_wait(file, sk_sleep(sk), wait);
1466
1467 if (sk->sk_state == IUCV_LISTEN)
1468 return iucv_accept_poll(sk);
1469
1470 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1471 mask |= POLLERR;
1472
1473 if (sk->sk_shutdown & RCV_SHUTDOWN)
1474 mask |= POLLRDHUP;
1475
1476 if (sk->sk_shutdown == SHUTDOWN_MASK)
1477 mask |= POLLHUP;
1478
1479 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1480 (sk->sk_shutdown & RCV_SHUTDOWN))
1481 mask |= POLLIN | POLLRDNORM;
1482
1483 if (sk->sk_state == IUCV_CLOSED)
1484 mask |= POLLHUP;
1485
1486 if (sk->sk_state == IUCV_DISCONN)
1487 mask |= POLLIN;
1488
1489 if (sock_writeable(sk))
1490 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1491 else
1492 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1493
1494 return mask;
1495 }
1496
1497 static int iucv_sock_shutdown(struct socket *sock, int how)
1498 {
1499 struct sock *sk = sock->sk;
1500 struct iucv_sock *iucv = iucv_sk(sk);
1501 struct iucv_message txmsg;
1502 int err = 0;
1503
1504 how++;
1505
1506 if ((how & ~SHUTDOWN_MASK) || !how)
1507 return -EINVAL;
1508
1509 lock_sock(sk);
1510 switch (sk->sk_state) {
1511 case IUCV_DISCONN:
1512 case IUCV_CLOSING:
1513 case IUCV_CLOSED:
1514 err = -ENOTCONN;
1515 goto fail;
1516
1517 default:
1518 sk->sk_shutdown |= how;
1519 break;
1520 }
1521
1522 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1523 txmsg.class = 0;
1524 txmsg.tag = 0;
1525 err = pr_iucv->message_send(iucv->path, &txmsg, IUCV_IPRMDATA,
1526 0, (void *) iprm_shutdown, 8);
1527 if (err) {
1528 switch (err) {
1529 case 1:
1530 err = -ENOTCONN;
1531 break;
1532 case 2:
1533 err = -ECONNRESET;
1534 break;
1535 default:
1536 err = -ENOTCONN;
1537 break;
1538 }
1539 }
1540 }
1541
1542 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1543 err = pr_iucv->path_quiesce(iucv->path, NULL);
1544 if (err)
1545 err = -ENOTCONN;
1546
1547 skb_queue_purge(&sk->sk_receive_queue);
1548 }
1549
1550 /* Wake up anyone sleeping in poll */
1551 sk->sk_state_change(sk);
1552
1553 fail:
1554 release_sock(sk);
1555 return err;
1556 }
1557
1558 static int iucv_sock_release(struct socket *sock)
1559 {
1560 struct sock *sk = sock->sk;
1561 int err = 0;
1562
1563 if (!sk)
1564 return 0;
1565
1566 iucv_sock_close(sk);
1567
1568 /* Unregister with IUCV base support */
1569 if (iucv_sk(sk)->path) {
1570 pr_iucv->path_sever(iucv_sk(sk)->path, NULL);
1571 iucv_path_free(iucv_sk(sk)->path);
1572 iucv_sk(sk)->path = NULL;
1573 }
1574
1575 sock_orphan(sk);
1576 iucv_sock_kill(sk);
1577 return err;
1578 }
1579
1580 /* getsockopt and setsockopt */
1581 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1582 char __user *optval, unsigned int optlen)
1583 {
1584 struct sock *sk = sock->sk;
1585 struct iucv_sock *iucv = iucv_sk(sk);
1586 int val;
1587 int rc;
1588
1589 if (level != SOL_IUCV)
1590 return -ENOPROTOOPT;
1591
1592 if (optlen < sizeof(int))
1593 return -EINVAL;
1594
1595 if (get_user(val, (int __user *) optval))
1596 return -EFAULT;
1597
1598 rc = 0;
1599
1600 lock_sock(sk);
1601 switch (optname) {
1602 case SO_IPRMDATA_MSG:
1603 if (val)
1604 iucv->flags |= IUCV_IPRMDATA;
1605 else
1606 iucv->flags &= ~IUCV_IPRMDATA;
1607 break;
1608 case SO_MSGLIMIT:
1609 switch (sk->sk_state) {
1610 case IUCV_OPEN:
1611 case IUCV_BOUND:
1612 if (val < 1 || val > (u16)(~0))
1613 rc = -EINVAL;
1614 else
1615 iucv->msglimit = val;
1616 break;
1617 default:
1618 rc = -EINVAL;
1619 break;
1620 }
1621 break;
1622 default:
1623 rc = -ENOPROTOOPT;
1624 break;
1625 }
1626 release_sock(sk);
1627
1628 return rc;
1629 }
1630
1631 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1632 char __user *optval, int __user *optlen)
1633 {
1634 struct sock *sk = sock->sk;
1635 struct iucv_sock *iucv = iucv_sk(sk);
1636 int val, len;
1637
1638 if (level != SOL_IUCV)
1639 return -ENOPROTOOPT;
1640
1641 if (get_user(len, optlen))
1642 return -EFAULT;
1643
1644 if (len < 0)
1645 return -EINVAL;
1646
1647 len = min_t(unsigned int, len, sizeof(int));
1648
1649 switch (optname) {
1650 case SO_IPRMDATA_MSG:
1651 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1652 break;
1653 case SO_MSGLIMIT:
1654 lock_sock(sk);
1655 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1656 : iucv->msglimit; /* default */
1657 release_sock(sk);
1658 break;
1659 default:
1660 return -ENOPROTOOPT;
1661 }
1662
1663 if (put_user(len, optlen))
1664 return -EFAULT;
1665 if (copy_to_user(optval, &val, len))
1666 return -EFAULT;
1667
1668 return 0;
1669 }
1670
1671
1672 /* Callback wrappers - called from iucv base support */
1673 static int iucv_callback_connreq(struct iucv_path *path,
1674 u8 ipvmid[8], u8 ipuser[16])
1675 {
1676 unsigned char user_data[16];
1677 unsigned char nuser_data[16];
1678 unsigned char src_name[8];
1679 struct hlist_node *node;
1680 struct sock *sk, *nsk;
1681 struct iucv_sock *iucv, *niucv;
1682 int err;
1683
1684 memcpy(src_name, ipuser, 8);
1685 EBCASC(src_name, 8);
1686 /* Find out if this path belongs to af_iucv. */
1687 read_lock(&iucv_sk_list.lock);
1688 iucv = NULL;
1689 sk = NULL;
1690 sk_for_each(sk, node, &iucv_sk_list.head)
1691 if (sk->sk_state == IUCV_LISTEN &&
1692 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1693 /*
1694 * Found a listening socket with
1695 * src_name == ipuser[0-7].
1696 */
1697 iucv = iucv_sk(sk);
1698 break;
1699 }
1700 read_unlock(&iucv_sk_list.lock);
1701 if (!iucv)
1702 /* No socket found, not one of our paths. */
1703 return -EINVAL;
1704
1705 bh_lock_sock(sk);
1706
1707 /* Check if parent socket is listening */
1708 low_nmcpy(user_data, iucv->src_name);
1709 high_nmcpy(user_data, iucv->dst_name);
1710 ASCEBC(user_data, sizeof(user_data));
1711 if (sk->sk_state != IUCV_LISTEN) {
1712 err = pr_iucv->path_sever(path, user_data);
1713 iucv_path_free(path);
1714 goto fail;
1715 }
1716
1717 /* Check for backlog size */
1718 if (sk_acceptq_is_full(sk)) {
1719 err = pr_iucv->path_sever(path, user_data);
1720 iucv_path_free(path);
1721 goto fail;
1722 }
1723
1724 /* Create the new socket */
1725 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1726 if (!nsk) {
1727 err = pr_iucv->path_sever(path, user_data);
1728 iucv_path_free(path);
1729 goto fail;
1730 }
1731
1732 niucv = iucv_sk(nsk);
1733 iucv_sock_init(nsk, sk);
1734
1735 /* Set the new iucv_sock */
1736 memcpy(niucv->dst_name, ipuser + 8, 8);
1737 EBCASC(niucv->dst_name, 8);
1738 memcpy(niucv->dst_user_id, ipvmid, 8);
1739 memcpy(niucv->src_name, iucv->src_name, 8);
1740 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1741 niucv->path = path;
1742
1743 /* Call iucv_accept */
1744 high_nmcpy(nuser_data, ipuser + 8);
1745 memcpy(nuser_data + 8, niucv->src_name, 8);
1746 ASCEBC(nuser_data + 8, 8);
1747
1748 /* set message limit for path based on msglimit of accepting socket */
1749 niucv->msglimit = iucv->msglimit;
1750 path->msglim = iucv->msglimit;
1751 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1752 if (err) {
1753 err = pr_iucv->path_sever(path, user_data);
1754 iucv_path_free(path);
1755 iucv_sock_kill(nsk);
1756 goto fail;
1757 }
1758
1759 iucv_accept_enqueue(sk, nsk);
1760
1761 /* Wake up accept */
1762 nsk->sk_state = IUCV_CONNECTED;
1763 sk->sk_data_ready(sk, 1);
1764 err = 0;
1765 fail:
1766 bh_unlock_sock(sk);
1767 return 0;
1768 }
1769
1770 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1771 {
1772 struct sock *sk = path->private;
1773
1774 sk->sk_state = IUCV_CONNECTED;
1775 sk->sk_state_change(sk);
1776 }
1777
1778 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1779 {
1780 struct sock *sk = path->private;
1781 struct iucv_sock *iucv = iucv_sk(sk);
1782 struct sk_buff *skb;
1783 struct sock_msg_q *save_msg;
1784 int len;
1785
1786 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1787 pr_iucv->message_reject(path, msg);
1788 return;
1789 }
1790
1791 spin_lock(&iucv->message_q.lock);
1792
1793 if (!list_empty(&iucv->message_q.list) ||
1794 !skb_queue_empty(&iucv->backlog_skb_q))
1795 goto save_message;
1796
1797 len = atomic_read(&sk->sk_rmem_alloc);
1798 len += SKB_TRUESIZE(iucv_msg_length(msg));
1799 if (len > sk->sk_rcvbuf)
1800 goto save_message;
1801
1802 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1803 if (!skb)
1804 goto save_message;
1805
1806 iucv_process_message(sk, skb, path, msg);
1807 goto out_unlock;
1808
1809 save_message:
1810 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1811 if (!save_msg)
1812 goto out_unlock;
1813 save_msg->path = path;
1814 save_msg->msg = *msg;
1815
1816 list_add_tail(&save_msg->list, &iucv->message_q.list);
1817
1818 out_unlock:
1819 spin_unlock(&iucv->message_q.lock);
1820 }
1821
1822 static void iucv_callback_txdone(struct iucv_path *path,
1823 struct iucv_message *msg)
1824 {
1825 struct sock *sk = path->private;
1826 struct sk_buff *this = NULL;
1827 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1828 struct sk_buff *list_skb = list->next;
1829 unsigned long flags;
1830
1831 if (!skb_queue_empty(list)) {
1832 spin_lock_irqsave(&list->lock, flags);
1833
1834 while (list_skb != (struct sk_buff *)list) {
1835 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1836 this = list_skb;
1837 break;
1838 }
1839 list_skb = list_skb->next;
1840 }
1841 if (this)
1842 __skb_unlink(this, list);
1843
1844 spin_unlock_irqrestore(&list->lock, flags);
1845
1846 if (this) {
1847 kfree_skb(this);
1848 /* wake up any process waiting for sending */
1849 iucv_sock_wake_msglim(sk);
1850 }
1851 }
1852 BUG_ON(!this);
1853
1854 if (sk->sk_state == IUCV_CLOSING) {
1855 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1856 sk->sk_state = IUCV_CLOSED;
1857 sk->sk_state_change(sk);
1858 }
1859 }
1860
1861 }
1862
1863 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1864 {
1865 struct sock *sk = path->private;
1866
1867 sk->sk_state = IUCV_DISCONN;
1868
1869 sk->sk_state_change(sk);
1870 }
1871
1872 /* called if the other communication side shuts down its RECV direction;
1873 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1874 */
1875 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1876 {
1877 struct sock *sk = path->private;
1878
1879 bh_lock_sock(sk);
1880 if (sk->sk_state != IUCV_CLOSED) {
1881 sk->sk_shutdown |= SEND_SHUTDOWN;
1882 sk->sk_state_change(sk);
1883 }
1884 bh_unlock_sock(sk);
1885 }
1886
1887 /***************** HiperSockets transport callbacks ********************/
1888 static void afiucv_swap_src_dest(struct sk_buff *skb)
1889 {
1890 struct af_iucv_trans_hdr *trans_hdr =
1891 (struct af_iucv_trans_hdr *)skb->data;
1892 char tmpID[8];
1893 char tmpName[8];
1894
1895 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1896 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1897 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1898 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1899 memcpy(tmpID, trans_hdr->srcUserID, 8);
1900 memcpy(tmpName, trans_hdr->srcAppName, 8);
1901 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1902 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1903 memcpy(trans_hdr->destUserID, tmpID, 8);
1904 memcpy(trans_hdr->destAppName, tmpName, 8);
1905 skb_push(skb, ETH_HLEN);
1906 memset(skb->data, 0, ETH_HLEN);
1907 }
1908
1909 /**
1910 * afiucv_hs_callback_syn - react on received SYN
1911 **/
1912 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1913 {
1914 struct sock *nsk;
1915 struct iucv_sock *iucv, *niucv;
1916 struct af_iucv_trans_hdr *trans_hdr;
1917 int err;
1918
1919 iucv = iucv_sk(sk);
1920 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1921 if (!iucv) {
1922 /* no sock - connection refused */
1923 afiucv_swap_src_dest(skb);
1924 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1925 err = dev_queue_xmit(skb);
1926 goto out;
1927 }
1928
1929 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1930 bh_lock_sock(sk);
1931 if ((sk->sk_state != IUCV_LISTEN) ||
1932 sk_acceptq_is_full(sk) ||
1933 !nsk) {
1934 /* error on server socket - connection refused */
1935 if (nsk)
1936 sk_free(nsk);
1937 afiucv_swap_src_dest(skb);
1938 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1939 err = dev_queue_xmit(skb);
1940 bh_unlock_sock(sk);
1941 goto out;
1942 }
1943
1944 niucv = iucv_sk(nsk);
1945 iucv_sock_init(nsk, sk);
1946 niucv->transport = AF_IUCV_TRANS_HIPER;
1947 niucv->msglimit = iucv->msglimit;
1948 if (!trans_hdr->window)
1949 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1950 else
1951 niucv->msglimit_peer = trans_hdr->window;
1952 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1953 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1954 memcpy(niucv->src_name, iucv->src_name, 8);
1955 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1956 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1957 afiucv_swap_src_dest(skb);
1958 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1959 trans_hdr->window = niucv->msglimit;
1960 /* if receiver acks the xmit connection is established */
1961 err = dev_queue_xmit(skb);
1962 if (!err) {
1963 iucv_accept_enqueue(sk, nsk);
1964 nsk->sk_state = IUCV_CONNECTED;
1965 sk->sk_data_ready(sk, 1);
1966 } else
1967 iucv_sock_kill(nsk);
1968 bh_unlock_sock(sk);
1969
1970 out:
1971 return NET_RX_SUCCESS;
1972 }
1973
1974 /**
1975 * afiucv_hs_callback_synack() - react on received SYN-ACK
1976 **/
1977 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1978 {
1979 struct iucv_sock *iucv = iucv_sk(sk);
1980 struct af_iucv_trans_hdr *trans_hdr =
1981 (struct af_iucv_trans_hdr *)skb->data;
1982
1983 if (!iucv)
1984 goto out;
1985 if (sk->sk_state != IUCV_BOUND)
1986 goto out;
1987 bh_lock_sock(sk);
1988 iucv->msglimit_peer = trans_hdr->window;
1989 sk->sk_state = IUCV_CONNECTED;
1990 sk->sk_state_change(sk);
1991 bh_unlock_sock(sk);
1992 out:
1993 kfree_skb(skb);
1994 return NET_RX_SUCCESS;
1995 }
1996
1997 /**
1998 * afiucv_hs_callback_synfin() - react on received SYN_FIN
1999 **/
2000 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2001 {
2002 struct iucv_sock *iucv = iucv_sk(sk);
2003
2004 if (!iucv)
2005 goto out;
2006 if (sk->sk_state != IUCV_BOUND)
2007 goto out;
2008 bh_lock_sock(sk);
2009 sk->sk_state = IUCV_DISCONN;
2010 sk->sk_state_change(sk);
2011 bh_unlock_sock(sk);
2012 out:
2013 kfree_skb(skb);
2014 return NET_RX_SUCCESS;
2015 }
2016
2017 /**
2018 * afiucv_hs_callback_fin() - react on received FIN
2019 **/
2020 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2021 {
2022 struct iucv_sock *iucv = iucv_sk(sk);
2023
2024 /* other end of connection closed */
2025 if (iucv) {
2026 bh_lock_sock(sk);
2027 sk->sk_state = IUCV_DISCONN;
2028 sk->sk_state_change(sk);
2029 bh_unlock_sock(sk);
2030 }
2031 kfree_skb(skb);
2032 return NET_RX_SUCCESS;
2033 }
2034
2035 /**
2036 * afiucv_hs_callback_win() - react on received WIN
2037 **/
2038 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2039 {
2040 struct iucv_sock *iucv = iucv_sk(sk);
2041 struct af_iucv_trans_hdr *trans_hdr =
2042 (struct af_iucv_trans_hdr *)skb->data;
2043
2044 if (!iucv)
2045 return NET_RX_SUCCESS;
2046
2047 if (sk->sk_state != IUCV_CONNECTED)
2048 return NET_RX_SUCCESS;
2049
2050 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2051 iucv_sock_wake_msglim(sk);
2052 return NET_RX_SUCCESS;
2053 }
2054
2055 /**
2056 * afiucv_hs_callback_rx() - react on received data
2057 **/
2058 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2059 {
2060 struct iucv_sock *iucv = iucv_sk(sk);
2061
2062 if (!iucv) {
2063 kfree_skb(skb);
2064 return NET_RX_SUCCESS;
2065 }
2066
2067 if (sk->sk_state != IUCV_CONNECTED) {
2068 kfree_skb(skb);
2069 return NET_RX_SUCCESS;
2070 }
2071
2072 /* write stuff from iucv_msg to skb cb */
2073 if (skb->len <= sizeof(struct af_iucv_trans_hdr)) {
2074 kfree_skb(skb);
2075 return NET_RX_SUCCESS;
2076 }
2077 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2078 skb_reset_transport_header(skb);
2079 skb_reset_network_header(skb);
2080 spin_lock(&iucv->message_q.lock);
2081 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2082 if (sock_queue_rcv_skb(sk, skb)) {
2083 /* handle rcv queue full */
2084 skb_queue_tail(&iucv->backlog_skb_q, skb);
2085 }
2086 } else
2087 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2088 spin_unlock(&iucv->message_q.lock);
2089 return NET_RX_SUCCESS;
2090 }
2091
2092 /**
2093 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2094 * transport
2095 * called from netif RX softirq
2096 **/
2097 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2098 struct packet_type *pt, struct net_device *orig_dev)
2099 {
2100 struct hlist_node *node;
2101 struct sock *sk;
2102 struct iucv_sock *iucv;
2103 struct af_iucv_trans_hdr *trans_hdr;
2104 char nullstring[8];
2105 int err = 0;
2106
2107 skb_pull(skb, ETH_HLEN);
2108 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2109 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2110 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2111 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2112 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2113 memset(nullstring, 0, sizeof(nullstring));
2114 iucv = NULL;
2115 sk = NULL;
2116 read_lock(&iucv_sk_list.lock);
2117 sk_for_each(sk, node, &iucv_sk_list.head) {
2118 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2119 if ((!memcmp(&iucv_sk(sk)->src_name,
2120 trans_hdr->destAppName, 8)) &&
2121 (!memcmp(&iucv_sk(sk)->src_user_id,
2122 trans_hdr->destUserID, 8)) &&
2123 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2124 (!memcmp(&iucv_sk(sk)->dst_user_id,
2125 nullstring, 8))) {
2126 iucv = iucv_sk(sk);
2127 break;
2128 }
2129 } else {
2130 if ((!memcmp(&iucv_sk(sk)->src_name,
2131 trans_hdr->destAppName, 8)) &&
2132 (!memcmp(&iucv_sk(sk)->src_user_id,
2133 trans_hdr->destUserID, 8)) &&
2134 (!memcmp(&iucv_sk(sk)->dst_name,
2135 trans_hdr->srcAppName, 8)) &&
2136 (!memcmp(&iucv_sk(sk)->dst_user_id,
2137 trans_hdr->srcUserID, 8))) {
2138 iucv = iucv_sk(sk);
2139 break;
2140 }
2141 }
2142 }
2143 read_unlock(&iucv_sk_list.lock);
2144 if (!iucv)
2145 sk = NULL;
2146
2147 /* no sock
2148 how should we send with no sock
2149 1) send without sock no send rc checking?
2150 2) introduce default sock to handle this cases
2151
2152 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2153 data -> send FIN
2154 SYN|ACK, SYN|FIN, FIN -> no action? */
2155
2156 switch (trans_hdr->flags) {
2157 case AF_IUCV_FLAG_SYN:
2158 /* connect request */
2159 err = afiucv_hs_callback_syn(sk, skb);
2160 break;
2161 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2162 /* connect request confirmed */
2163 err = afiucv_hs_callback_synack(sk, skb);
2164 break;
2165 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2166 /* connect request refused */
2167 err = afiucv_hs_callback_synfin(sk, skb);
2168 break;
2169 case (AF_IUCV_FLAG_FIN):
2170 /* close request */
2171 err = afiucv_hs_callback_fin(sk, skb);
2172 break;
2173 case (AF_IUCV_FLAG_WIN):
2174 err = afiucv_hs_callback_win(sk, skb);
2175 if (skb->len > sizeof(struct af_iucv_trans_hdr))
2176 err = afiucv_hs_callback_rx(sk, skb);
2177 else
2178 kfree(skb);
2179 break;
2180 case 0:
2181 /* plain data frame */
2182 memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class,
2183 CB_TRGCLS_LEN);
2184 err = afiucv_hs_callback_rx(sk, skb);
2185 break;
2186 default:
2187 ;
2188 }
2189
2190 return err;
2191 }
2192
2193 /**
2194 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2195 * transport
2196 **/
2197 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2198 enum iucv_tx_notify n)
2199 {
2200 struct sock *isk = skb->sk;
2201 struct sock *sk = NULL;
2202 struct iucv_sock *iucv = NULL;
2203 struct sk_buff_head *list;
2204 struct sk_buff *list_skb;
2205 struct sk_buff *this = NULL;
2206 unsigned long flags;
2207 struct hlist_node *node;
2208
2209 read_lock(&iucv_sk_list.lock);
2210 sk_for_each(sk, node, &iucv_sk_list.head)
2211 if (sk == isk) {
2212 iucv = iucv_sk(sk);
2213 break;
2214 }
2215 read_unlock(&iucv_sk_list.lock);
2216
2217 if (!iucv)
2218 return;
2219
2220 bh_lock_sock(sk);
2221 list = &iucv->send_skb_q;
2222 list_skb = list->next;
2223 if (skb_queue_empty(list))
2224 goto out_unlock;
2225
2226 spin_lock_irqsave(&list->lock, flags);
2227 while (list_skb != (struct sk_buff *)list) {
2228 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2229 this = list_skb;
2230 switch (n) {
2231 case TX_NOTIFY_OK:
2232 __skb_unlink(this, list);
2233 iucv_sock_wake_msglim(sk);
2234 dev_put(this->dev);
2235 kfree_skb(this);
2236 break;
2237 case TX_NOTIFY_PENDING:
2238 atomic_inc(&iucv->pendings);
2239 break;
2240 case TX_NOTIFY_DELAYED_OK:
2241 __skb_unlink(this, list);
2242 atomic_dec(&iucv->pendings);
2243 if (atomic_read(&iucv->pendings) <= 0)
2244 iucv_sock_wake_msglim(sk);
2245 dev_put(this->dev);
2246 kfree_skb(this);
2247 break;
2248 case TX_NOTIFY_UNREACHABLE:
2249 case TX_NOTIFY_DELAYED_UNREACHABLE:
2250 case TX_NOTIFY_TPQFULL: /* not yet used */
2251 case TX_NOTIFY_GENERALERROR:
2252 case TX_NOTIFY_DELAYED_GENERALERROR:
2253 __skb_unlink(this, list);
2254 dev_put(this->dev);
2255 kfree_skb(this);
2256 sk->sk_state = IUCV_DISCONN;
2257 sk->sk_state_change(sk);
2258 break;
2259 }
2260 break;
2261 }
2262 list_skb = list_skb->next;
2263 }
2264 spin_unlock_irqrestore(&list->lock, flags);
2265
2266 if (sk->sk_state == IUCV_CLOSING) {
2267 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2268 sk->sk_state = IUCV_CLOSED;
2269 sk->sk_state_change(sk);
2270 }
2271 }
2272
2273 out_unlock:
2274 bh_unlock_sock(sk);
2275 }
2276 static const struct proto_ops iucv_sock_ops = {
2277 .family = PF_IUCV,
2278 .owner = THIS_MODULE,
2279 .release = iucv_sock_release,
2280 .bind = iucv_sock_bind,
2281 .connect = iucv_sock_connect,
2282 .listen = iucv_sock_listen,
2283 .accept = iucv_sock_accept,
2284 .getname = iucv_sock_getname,
2285 .sendmsg = iucv_sock_sendmsg,
2286 .recvmsg = iucv_sock_recvmsg,
2287 .poll = iucv_sock_poll,
2288 .ioctl = sock_no_ioctl,
2289 .mmap = sock_no_mmap,
2290 .socketpair = sock_no_socketpair,
2291 .shutdown = iucv_sock_shutdown,
2292 .setsockopt = iucv_sock_setsockopt,
2293 .getsockopt = iucv_sock_getsockopt,
2294 };
2295
2296 static const struct net_proto_family iucv_sock_family_ops = {
2297 .family = AF_IUCV,
2298 .owner = THIS_MODULE,
2299 .create = iucv_sock_create,
2300 };
2301
2302 static struct packet_type iucv_packet_type = {
2303 .type = cpu_to_be16(ETH_P_AF_IUCV),
2304 .func = afiucv_hs_rcv,
2305 };
2306
2307 static int afiucv_iucv_init(void)
2308 {
2309 int err;
2310
2311 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2312 if (err)
2313 goto out;
2314 /* establish dummy device */
2315 af_iucv_driver.bus = pr_iucv->bus;
2316 err = driver_register(&af_iucv_driver);
2317 if (err)
2318 goto out_iucv;
2319 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2320 if (!af_iucv_dev) {
2321 err = -ENOMEM;
2322 goto out_driver;
2323 }
2324 dev_set_name(af_iucv_dev, "af_iucv");
2325 af_iucv_dev->bus = pr_iucv->bus;
2326 af_iucv_dev->parent = pr_iucv->root;
2327 af_iucv_dev->release = (void (*)(struct device *))kfree;
2328 af_iucv_dev->driver = &af_iucv_driver;
2329 err = device_register(af_iucv_dev);
2330 if (err)
2331 goto out_driver;
2332 return 0;
2333
2334 out_driver:
2335 driver_unregister(&af_iucv_driver);
2336 out_iucv:
2337 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2338 out:
2339 return err;
2340 }
2341
2342 static int __init afiucv_init(void)
2343 {
2344 int err;
2345
2346 if (MACHINE_IS_VM) {
2347 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2348 if (unlikely(err)) {
2349 WARN_ON(err);
2350 err = -EPROTONOSUPPORT;
2351 goto out;
2352 }
2353
2354 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2355 if (!pr_iucv) {
2356 printk(KERN_WARNING "iucv_if lookup failed\n");
2357 memset(&iucv_userid, 0, sizeof(iucv_userid));
2358 }
2359 } else {
2360 memset(&iucv_userid, 0, sizeof(iucv_userid));
2361 pr_iucv = NULL;
2362 }
2363
2364 err = proto_register(&iucv_proto, 0);
2365 if (err)
2366 goto out;
2367 err = sock_register(&iucv_sock_family_ops);
2368 if (err)
2369 goto out_proto;
2370
2371 if (pr_iucv) {
2372 err = afiucv_iucv_init();
2373 if (err)
2374 goto out_sock;
2375 }
2376 dev_add_pack(&iucv_packet_type);
2377 return 0;
2378
2379 out_sock:
2380 sock_unregister(PF_IUCV);
2381 out_proto:
2382 proto_unregister(&iucv_proto);
2383 out:
2384 if (pr_iucv)
2385 symbol_put(iucv_if);
2386 return err;
2387 }
2388
2389 static void __exit afiucv_exit(void)
2390 {
2391 if (pr_iucv) {
2392 device_unregister(af_iucv_dev);
2393 driver_unregister(&af_iucv_driver);
2394 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2395 symbol_put(iucv_if);
2396 }
2397 dev_remove_pack(&iucv_packet_type);
2398 sock_unregister(PF_IUCV);
2399 proto_unregister(&iucv_proto);
2400 }
2401
2402 module_init(afiucv_init);
2403 module_exit(afiucv_exit);
2404
2405 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2406 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2407 MODULE_VERSION(VERSION);
2408 MODULE_LICENSE("GPL");
2409 MODULE_ALIAS_NETPROTO(PF_IUCV);
2410
Linux with added FPC-III support