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Merge tag 'libnvdimm-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm...
[deliverable/linux.git] / net / iucv / af_iucv.c
1 /*
2 * IUCV protocol stack for Linux on zSeries
3 *
4 * Copyright IBM Corp. 2006, 2009
5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.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 *);
99 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
100 static void iucv_callback_connrej(struct iucv_path *, u8 *);
101 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
102
103 static struct iucv_sock_list iucv_sk_list = {
104 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
105 .autobind_name = ATOMIC_INIT(0)
106 };
107
108 static struct iucv_handler af_iucv_handler = {
109 .path_pending = iucv_callback_connreq,
110 .path_complete = iucv_callback_connack,
111 .path_severed = iucv_callback_connrej,
112 .message_pending = iucv_callback_rx,
113 .message_complete = iucv_callback_txdone,
114 .path_quiesced = iucv_callback_shutdown,
115 };
116
117 static inline void high_nmcpy(unsigned char *dst, char *src)
118 {
119 memcpy(dst, src, 8);
120 }
121
122 static inline void low_nmcpy(unsigned char *dst, char *src)
123 {
124 memcpy(&dst[8], src, 8);
125 }
126
127 static int afiucv_pm_prepare(struct device *dev)
128 {
129 #ifdef CONFIG_PM_DEBUG
130 printk(KERN_WARNING "afiucv_pm_prepare\n");
131 #endif
132 return 0;
133 }
134
135 static void afiucv_pm_complete(struct device *dev)
136 {
137 #ifdef CONFIG_PM_DEBUG
138 printk(KERN_WARNING "afiucv_pm_complete\n");
139 #endif
140 }
141
142 /**
143 * afiucv_pm_freeze() - Freeze PM callback
144 * @dev: AFIUCV dummy device
145 *
146 * Sever all established IUCV communication pathes
147 */
148 static int afiucv_pm_freeze(struct device *dev)
149 {
150 struct iucv_sock *iucv;
151 struct sock *sk;
152 int err = 0;
153
154 #ifdef CONFIG_PM_DEBUG
155 printk(KERN_WARNING "afiucv_pm_freeze\n");
156 #endif
157 read_lock(&iucv_sk_list.lock);
158 sk_for_each(sk, &iucv_sk_list.head) {
159 iucv = iucv_sk(sk);
160 switch (sk->sk_state) {
161 case IUCV_DISCONN:
162 case IUCV_CLOSING:
163 case IUCV_CONNECTED:
164 iucv_sever_path(sk, 0);
165 break;
166 case IUCV_OPEN:
167 case IUCV_BOUND:
168 case IUCV_LISTEN:
169 case IUCV_CLOSED:
170 default:
171 break;
172 }
173 skb_queue_purge(&iucv->send_skb_q);
174 skb_queue_purge(&iucv->backlog_skb_q);
175 }
176 read_unlock(&iucv_sk_list.lock);
177 return err;
178 }
179
180 /**
181 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
182 * @dev: AFIUCV dummy device
183 *
184 * socket clean up after freeze
185 */
186 static int afiucv_pm_restore_thaw(struct device *dev)
187 {
188 struct sock *sk;
189
190 #ifdef CONFIG_PM_DEBUG
191 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
192 #endif
193 read_lock(&iucv_sk_list.lock);
194 sk_for_each(sk, &iucv_sk_list.head) {
195 switch (sk->sk_state) {
196 case IUCV_CONNECTED:
197 sk->sk_err = EPIPE;
198 sk->sk_state = IUCV_DISCONN;
199 sk->sk_state_change(sk);
200 break;
201 case IUCV_DISCONN:
202 case IUCV_CLOSING:
203 case IUCV_LISTEN:
204 case IUCV_BOUND:
205 case IUCV_OPEN:
206 default:
207 break;
208 }
209 }
210 read_unlock(&iucv_sk_list.lock);
211 return 0;
212 }
213
214 static const struct dev_pm_ops afiucv_pm_ops = {
215 .prepare = afiucv_pm_prepare,
216 .complete = afiucv_pm_complete,
217 .freeze = afiucv_pm_freeze,
218 .thaw = afiucv_pm_restore_thaw,
219 .restore = afiucv_pm_restore_thaw,
220 };
221
222 static struct device_driver af_iucv_driver = {
223 .owner = THIS_MODULE,
224 .name = "afiucv",
225 .bus = NULL,
226 .pm = &afiucv_pm_ops,
227 };
228
229 /* dummy device used as trigger for PM functions */
230 static struct device *af_iucv_dev;
231
232 /**
233 * iucv_msg_length() - Returns the length of an iucv message.
234 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
235 *
236 * The function returns the length of the specified iucv message @msg of data
237 * stored in a buffer and of data stored in the parameter list (PRMDATA).
238 *
239 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
240 * data:
241 * PRMDATA[0..6] socket data (max 7 bytes);
242 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
243 *
244 * The socket data length is computed by subtracting the socket data length
245 * value from 0xFF.
246 * If the socket data len is greater 7, then PRMDATA can be used for special
247 * notifications (see iucv_sock_shutdown); and further,
248 * if the socket data len is > 7, the function returns 8.
249 *
250 * Use this function to allocate socket buffers to store iucv message data.
251 */
252 static inline size_t iucv_msg_length(struct iucv_message *msg)
253 {
254 size_t datalen;
255
256 if (msg->flags & IUCV_IPRMDATA) {
257 datalen = 0xff - msg->rmmsg[7];
258 return (datalen < 8) ? datalen : 8;
259 }
260 return msg->length;
261 }
262
263 /**
264 * iucv_sock_in_state() - check for specific states
265 * @sk: sock structure
266 * @state: first iucv sk state
267 * @state: second iucv sk state
268 *
269 * Returns true if the socket in either in the first or second state.
270 */
271 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
272 {
273 return (sk->sk_state == state || sk->sk_state == state2);
274 }
275
276 /**
277 * iucv_below_msglim() - function to check if messages can be sent
278 * @sk: sock structure
279 *
280 * Returns true if the send queue length is lower than the message limit.
281 * Always returns true if the socket is not connected (no iucv path for
282 * checking the message limit).
283 */
284 static inline int iucv_below_msglim(struct sock *sk)
285 {
286 struct iucv_sock *iucv = iucv_sk(sk);
287
288 if (sk->sk_state != IUCV_CONNECTED)
289 return 1;
290 if (iucv->transport == AF_IUCV_TRANS_IUCV)
291 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
292 else
293 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
294 (atomic_read(&iucv->pendings) <= 0));
295 }
296
297 /**
298 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
299 */
300 static void iucv_sock_wake_msglim(struct sock *sk)
301 {
302 struct socket_wq *wq;
303
304 rcu_read_lock();
305 wq = rcu_dereference(sk->sk_wq);
306 if (skwq_has_sleeper(wq))
307 wake_up_interruptible_all(&wq->wait);
308 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
309 rcu_read_unlock();
310 }
311
312 /**
313 * afiucv_hs_send() - send a message through HiperSockets transport
314 */
315 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
316 struct sk_buff *skb, u8 flags)
317 {
318 struct iucv_sock *iucv = iucv_sk(sock);
319 struct af_iucv_trans_hdr *phs_hdr;
320 struct sk_buff *nskb;
321 int err, confirm_recv = 0;
322
323 memset(skb->head, 0, ETH_HLEN);
324 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
325 sizeof(struct af_iucv_trans_hdr));
326 skb_reset_mac_header(skb);
327 skb_reset_network_header(skb);
328 skb_push(skb, ETH_HLEN);
329 skb_reset_mac_header(skb);
330 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
331
332 phs_hdr->magic = ETH_P_AF_IUCV;
333 phs_hdr->version = 1;
334 phs_hdr->flags = flags;
335 if (flags == AF_IUCV_FLAG_SYN)
336 phs_hdr->window = iucv->msglimit;
337 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
338 confirm_recv = atomic_read(&iucv->msg_recv);
339 phs_hdr->window = confirm_recv;
340 if (confirm_recv)
341 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
342 }
343 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
344 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
345 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
346 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
347 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
348 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
349 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
350 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
351 if (imsg)
352 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
353
354 skb->dev = iucv->hs_dev;
355 if (!skb->dev)
356 return -ENODEV;
357 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
358 return -ENETDOWN;
359 if (skb->len > skb->dev->mtu) {
360 if (sock->sk_type == SOCK_SEQPACKET)
361 return -EMSGSIZE;
362 else
363 skb_trim(skb, skb->dev->mtu);
364 }
365 skb->protocol = ETH_P_AF_IUCV;
366 nskb = skb_clone(skb, GFP_ATOMIC);
367 if (!nskb)
368 return -ENOMEM;
369 skb_queue_tail(&iucv->send_skb_q, nskb);
370 err = dev_queue_xmit(skb);
371 if (net_xmit_eval(err)) {
372 skb_unlink(nskb, &iucv->send_skb_q);
373 kfree_skb(nskb);
374 } else {
375 atomic_sub(confirm_recv, &iucv->msg_recv);
376 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
377 }
378 return net_xmit_eval(err);
379 }
380
381 static struct sock *__iucv_get_sock_by_name(char *nm)
382 {
383 struct sock *sk;
384
385 sk_for_each(sk, &iucv_sk_list.head)
386 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
387 return sk;
388
389 return NULL;
390 }
391
392 static void iucv_sock_destruct(struct sock *sk)
393 {
394 skb_queue_purge(&sk->sk_receive_queue);
395 skb_queue_purge(&sk->sk_error_queue);
396
397 sk_mem_reclaim(sk);
398
399 if (!sock_flag(sk, SOCK_DEAD)) {
400 pr_err("Attempt to release alive iucv socket %p\n", sk);
401 return;
402 }
403
404 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
405 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
406 WARN_ON(sk->sk_wmem_queued);
407 WARN_ON(sk->sk_forward_alloc);
408 }
409
410 /* Cleanup Listen */
411 static void iucv_sock_cleanup_listen(struct sock *parent)
412 {
413 struct sock *sk;
414
415 /* Close non-accepted connections */
416 while ((sk = iucv_accept_dequeue(parent, NULL))) {
417 iucv_sock_close(sk);
418 iucv_sock_kill(sk);
419 }
420
421 parent->sk_state = IUCV_CLOSED;
422 }
423
424 /* Kill socket (only if zapped and orphaned) */
425 static void iucv_sock_kill(struct sock *sk)
426 {
427 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
428 return;
429
430 iucv_sock_unlink(&iucv_sk_list, sk);
431 sock_set_flag(sk, SOCK_DEAD);
432 sock_put(sk);
433 }
434
435 /* Terminate an IUCV path */
436 static void iucv_sever_path(struct sock *sk, int with_user_data)
437 {
438 unsigned char user_data[16];
439 struct iucv_sock *iucv = iucv_sk(sk);
440 struct iucv_path *path = iucv->path;
441
442 if (iucv->path) {
443 iucv->path = NULL;
444 if (with_user_data) {
445 low_nmcpy(user_data, iucv->src_name);
446 high_nmcpy(user_data, iucv->dst_name);
447 ASCEBC(user_data, sizeof(user_data));
448 pr_iucv->path_sever(path, user_data);
449 } else
450 pr_iucv->path_sever(path, NULL);
451 iucv_path_free(path);
452 }
453 }
454
455 /* Send FIN through an IUCV socket for HIPER transport */
456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
457 {
458 int err = 0;
459 int blen;
460 struct sk_buff *skb;
461
462 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
463 skb = sock_alloc_send_skb(sk, blen, 1, &err);
464 if (skb) {
465 skb_reserve(skb, blen);
466 err = afiucv_hs_send(NULL, sk, skb, flags);
467 }
468 return err;
469 }
470
471 /* Close an IUCV socket */
472 static void iucv_sock_close(struct sock *sk)
473 {
474 struct iucv_sock *iucv = iucv_sk(sk);
475 unsigned long timeo;
476 int err = 0;
477
478 lock_sock(sk);
479
480 switch (sk->sk_state) {
481 case IUCV_LISTEN:
482 iucv_sock_cleanup_listen(sk);
483 break;
484
485 case IUCV_CONNECTED:
486 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
487 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
488 sk->sk_state = IUCV_DISCONN;
489 sk->sk_state_change(sk);
490 }
491 case IUCV_DISCONN: /* fall through */
492 sk->sk_state = IUCV_CLOSING;
493 sk->sk_state_change(sk);
494
495 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
496 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
497 timeo = sk->sk_lingertime;
498 else
499 timeo = IUCV_DISCONN_TIMEOUT;
500 iucv_sock_wait(sk,
501 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
502 timeo);
503 }
504
505 case IUCV_CLOSING: /* fall through */
506 sk->sk_state = IUCV_CLOSED;
507 sk->sk_state_change(sk);
508
509 sk->sk_err = ECONNRESET;
510 sk->sk_state_change(sk);
511
512 skb_queue_purge(&iucv->send_skb_q);
513 skb_queue_purge(&iucv->backlog_skb_q);
514
515 default: /* fall through */
516 iucv_sever_path(sk, 1);
517 }
518
519 if (iucv->hs_dev) {
520 dev_put(iucv->hs_dev);
521 iucv->hs_dev = NULL;
522 sk->sk_bound_dev_if = 0;
523 }
524
525 /* mark socket for deletion by iucv_sock_kill() */
526 sock_set_flag(sk, SOCK_ZAPPED);
527
528 release_sock(sk);
529 }
530
531 static void iucv_sock_init(struct sock *sk, struct sock *parent)
532 {
533 if (parent)
534 sk->sk_type = parent->sk_type;
535 }
536
537 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
538 {
539 struct sock *sk;
540 struct iucv_sock *iucv;
541
542 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
543 if (!sk)
544 return NULL;
545 iucv = iucv_sk(sk);
546
547 sock_init_data(sock, sk);
548 INIT_LIST_HEAD(&iucv->accept_q);
549 spin_lock_init(&iucv->accept_q_lock);
550 skb_queue_head_init(&iucv->send_skb_q);
551 INIT_LIST_HEAD(&iucv->message_q.list);
552 spin_lock_init(&iucv->message_q.lock);
553 skb_queue_head_init(&iucv->backlog_skb_q);
554 iucv->send_tag = 0;
555 atomic_set(&iucv->pendings, 0);
556 iucv->flags = 0;
557 iucv->msglimit = 0;
558 atomic_set(&iucv->msg_sent, 0);
559 atomic_set(&iucv->msg_recv, 0);
560 iucv->path = NULL;
561 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
562 memset(&iucv->src_user_id , 0, 32);
563 if (pr_iucv)
564 iucv->transport = AF_IUCV_TRANS_IUCV;
565 else
566 iucv->transport = AF_IUCV_TRANS_HIPER;
567
568 sk->sk_destruct = iucv_sock_destruct;
569 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
570 sk->sk_allocation = GFP_DMA;
571
572 sock_reset_flag(sk, SOCK_ZAPPED);
573
574 sk->sk_protocol = proto;
575 sk->sk_state = IUCV_OPEN;
576
577 iucv_sock_link(&iucv_sk_list, sk);
578 return sk;
579 }
580
581 /* Create an IUCV socket */
582 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
583 int kern)
584 {
585 struct sock *sk;
586
587 if (protocol && protocol != PF_IUCV)
588 return -EPROTONOSUPPORT;
589
590 sock->state = SS_UNCONNECTED;
591
592 switch (sock->type) {
593 case SOCK_STREAM:
594 sock->ops = &iucv_sock_ops;
595 break;
596 case SOCK_SEQPACKET:
597 /* currently, proto ops can handle both sk types */
598 sock->ops = &iucv_sock_ops;
599 break;
600 default:
601 return -ESOCKTNOSUPPORT;
602 }
603
604 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
605 if (!sk)
606 return -ENOMEM;
607
608 iucv_sock_init(sk, NULL);
609
610 return 0;
611 }
612
613 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
614 {
615 write_lock_bh(&l->lock);
616 sk_add_node(sk, &l->head);
617 write_unlock_bh(&l->lock);
618 }
619
620 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
621 {
622 write_lock_bh(&l->lock);
623 sk_del_node_init(sk);
624 write_unlock_bh(&l->lock);
625 }
626
627 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
628 {
629 unsigned long flags;
630 struct iucv_sock *par = iucv_sk(parent);
631
632 sock_hold(sk);
633 spin_lock_irqsave(&par->accept_q_lock, flags);
634 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
635 spin_unlock_irqrestore(&par->accept_q_lock, flags);
636 iucv_sk(sk)->parent = parent;
637 sk_acceptq_added(parent);
638 }
639
640 void iucv_accept_unlink(struct sock *sk)
641 {
642 unsigned long flags;
643 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
644
645 spin_lock_irqsave(&par->accept_q_lock, flags);
646 list_del_init(&iucv_sk(sk)->accept_q);
647 spin_unlock_irqrestore(&par->accept_q_lock, flags);
648 sk_acceptq_removed(iucv_sk(sk)->parent);
649 iucv_sk(sk)->parent = NULL;
650 sock_put(sk);
651 }
652
653 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
654 {
655 struct iucv_sock *isk, *n;
656 struct sock *sk;
657
658 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
659 sk = (struct sock *) isk;
660 lock_sock(sk);
661
662 if (sk->sk_state == IUCV_CLOSED) {
663 iucv_accept_unlink(sk);
664 release_sock(sk);
665 continue;
666 }
667
668 if (sk->sk_state == IUCV_CONNECTED ||
669 sk->sk_state == IUCV_DISCONN ||
670 !newsock) {
671 iucv_accept_unlink(sk);
672 if (newsock)
673 sock_graft(sk, newsock);
674
675 release_sock(sk);
676 return sk;
677 }
678
679 release_sock(sk);
680 }
681 return NULL;
682 }
683
684 static void __iucv_auto_name(struct iucv_sock *iucv)
685 {
686 char name[12];
687
688 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
689 while (__iucv_get_sock_by_name(name)) {
690 sprintf(name, "%08x",
691 atomic_inc_return(&iucv_sk_list.autobind_name));
692 }
693 memcpy(iucv->src_name, name, 8);
694 }
695
696 /* Bind an unbound socket */
697 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
698 int addr_len)
699 {
700 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
701 struct sock *sk = sock->sk;
702 struct iucv_sock *iucv;
703 int err = 0;
704 struct net_device *dev;
705 char uid[9];
706
707 /* Verify the input sockaddr */
708 if (!addr || addr->sa_family != AF_IUCV)
709 return -EINVAL;
710
711 if (addr_len < sizeof(struct sockaddr_iucv))
712 return -EINVAL;
713
714 lock_sock(sk);
715 if (sk->sk_state != IUCV_OPEN) {
716 err = -EBADFD;
717 goto done;
718 }
719
720 write_lock_bh(&iucv_sk_list.lock);
721
722 iucv = iucv_sk(sk);
723 if (__iucv_get_sock_by_name(sa->siucv_name)) {
724 err = -EADDRINUSE;
725 goto done_unlock;
726 }
727 if (iucv->path)
728 goto done_unlock;
729
730 /* Bind the socket */
731 if (pr_iucv)
732 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
733 goto vm_bind; /* VM IUCV transport */
734
735 /* try hiper transport */
736 memcpy(uid, sa->siucv_user_id, sizeof(uid));
737 ASCEBC(uid, 8);
738 rcu_read_lock();
739 for_each_netdev_rcu(&init_net, dev) {
740 if (!memcmp(dev->perm_addr, uid, 8)) {
741 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
742 /* Check for unitialized siucv_name */
743 if (strncmp(sa->siucv_name, " ", 8) == 0)
744 __iucv_auto_name(iucv);
745 else
746 memcpy(iucv->src_name, sa->siucv_name, 8);
747 sk->sk_bound_dev_if = dev->ifindex;
748 iucv->hs_dev = dev;
749 dev_hold(dev);
750 sk->sk_state = IUCV_BOUND;
751 iucv->transport = AF_IUCV_TRANS_HIPER;
752 if (!iucv->msglimit)
753 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
754 rcu_read_unlock();
755 goto done_unlock;
756 }
757 }
758 rcu_read_unlock();
759 vm_bind:
760 if (pr_iucv) {
761 /* use local userid for backward compat */
762 memcpy(iucv->src_name, sa->siucv_name, 8);
763 memcpy(iucv->src_user_id, iucv_userid, 8);
764 sk->sk_state = IUCV_BOUND;
765 iucv->transport = AF_IUCV_TRANS_IUCV;
766 if (!iucv->msglimit)
767 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
768 goto done_unlock;
769 }
770 /* found no dev to bind */
771 err = -ENODEV;
772 done_unlock:
773 /* Release the socket list lock */
774 write_unlock_bh(&iucv_sk_list.lock);
775 done:
776 release_sock(sk);
777 return err;
778 }
779
780 /* Automatically bind an unbound socket */
781 static int iucv_sock_autobind(struct sock *sk)
782 {
783 struct iucv_sock *iucv = iucv_sk(sk);
784 int err = 0;
785
786 if (unlikely(!pr_iucv))
787 return -EPROTO;
788
789 memcpy(iucv->src_user_id, iucv_userid, 8);
790
791 write_lock_bh(&iucv_sk_list.lock);
792 __iucv_auto_name(iucv);
793 write_unlock_bh(&iucv_sk_list.lock);
794
795 if (!iucv->msglimit)
796 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
797
798 return err;
799 }
800
801 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
802 {
803 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
804 struct sock *sk = sock->sk;
805 struct iucv_sock *iucv = iucv_sk(sk);
806 unsigned char user_data[16];
807 int err;
808
809 high_nmcpy(user_data, sa->siucv_name);
810 low_nmcpy(user_data, iucv->src_name);
811 ASCEBC(user_data, sizeof(user_data));
812
813 /* Create path. */
814 iucv->path = iucv_path_alloc(iucv->msglimit,
815 IUCV_IPRMDATA, GFP_KERNEL);
816 if (!iucv->path) {
817 err = -ENOMEM;
818 goto done;
819 }
820 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
821 sa->siucv_user_id, NULL, user_data,
822 sk);
823 if (err) {
824 iucv_path_free(iucv->path);
825 iucv->path = NULL;
826 switch (err) {
827 case 0x0b: /* Target communicator is not logged on */
828 err = -ENETUNREACH;
829 break;
830 case 0x0d: /* Max connections for this guest exceeded */
831 case 0x0e: /* Max connections for target guest exceeded */
832 err = -EAGAIN;
833 break;
834 case 0x0f: /* Missing IUCV authorization */
835 err = -EACCES;
836 break;
837 default:
838 err = -ECONNREFUSED;
839 break;
840 }
841 }
842 done:
843 return err;
844 }
845
846 /* Connect an unconnected socket */
847 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
848 int alen, int flags)
849 {
850 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
851 struct sock *sk = sock->sk;
852 struct iucv_sock *iucv = iucv_sk(sk);
853 int err;
854
855 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
856 return -EINVAL;
857
858 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
859 return -EBADFD;
860
861 if (sk->sk_state == IUCV_OPEN &&
862 iucv->transport == AF_IUCV_TRANS_HIPER)
863 return -EBADFD; /* explicit bind required */
864
865 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
866 return -EINVAL;
867
868 if (sk->sk_state == IUCV_OPEN) {
869 err = iucv_sock_autobind(sk);
870 if (unlikely(err))
871 return err;
872 }
873
874 lock_sock(sk);
875
876 /* Set the destination information */
877 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
878 memcpy(iucv->dst_name, sa->siucv_name, 8);
879
880 if (iucv->transport == AF_IUCV_TRANS_HIPER)
881 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
882 else
883 err = afiucv_path_connect(sock, addr);
884 if (err)
885 goto done;
886
887 if (sk->sk_state != IUCV_CONNECTED)
888 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
889 IUCV_DISCONN),
890 sock_sndtimeo(sk, flags & O_NONBLOCK));
891
892 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
893 err = -ECONNREFUSED;
894
895 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
896 iucv_sever_path(sk, 0);
897
898 done:
899 release_sock(sk);
900 return err;
901 }
902
903 /* Move a socket into listening state. */
904 static int iucv_sock_listen(struct socket *sock, int backlog)
905 {
906 struct sock *sk = sock->sk;
907 int err;
908
909 lock_sock(sk);
910
911 err = -EINVAL;
912 if (sk->sk_state != IUCV_BOUND)
913 goto done;
914
915 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
916 goto done;
917
918 sk->sk_max_ack_backlog = backlog;
919 sk->sk_ack_backlog = 0;
920 sk->sk_state = IUCV_LISTEN;
921 err = 0;
922
923 done:
924 release_sock(sk);
925 return err;
926 }
927
928 /* Accept a pending connection */
929 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
930 int flags)
931 {
932 DECLARE_WAITQUEUE(wait, current);
933 struct sock *sk = sock->sk, *nsk;
934 long timeo;
935 int err = 0;
936
937 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
938
939 if (sk->sk_state != IUCV_LISTEN) {
940 err = -EBADFD;
941 goto done;
942 }
943
944 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
945
946 /* Wait for an incoming connection */
947 add_wait_queue_exclusive(sk_sleep(sk), &wait);
948 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
949 set_current_state(TASK_INTERRUPTIBLE);
950 if (!timeo) {
951 err = -EAGAIN;
952 break;
953 }
954
955 release_sock(sk);
956 timeo = schedule_timeout(timeo);
957 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
958
959 if (sk->sk_state != IUCV_LISTEN) {
960 err = -EBADFD;
961 break;
962 }
963
964 if (signal_pending(current)) {
965 err = sock_intr_errno(timeo);
966 break;
967 }
968 }
969
970 set_current_state(TASK_RUNNING);
971 remove_wait_queue(sk_sleep(sk), &wait);
972
973 if (err)
974 goto done;
975
976 newsock->state = SS_CONNECTED;
977
978 done:
979 release_sock(sk);
980 return err;
981 }
982
983 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
984 int *len, int peer)
985 {
986 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
987 struct sock *sk = sock->sk;
988 struct iucv_sock *iucv = iucv_sk(sk);
989
990 addr->sa_family = AF_IUCV;
991 *len = sizeof(struct sockaddr_iucv);
992
993 if (peer) {
994 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
995 memcpy(siucv->siucv_name, iucv->dst_name, 8);
996 } else {
997 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
998 memcpy(siucv->siucv_name, iucv->src_name, 8);
999 }
1000 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1001 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1002 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1003
1004 return 0;
1005 }
1006
1007 /**
1008 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1009 * @path: IUCV path
1010 * @msg: Pointer to a struct iucv_message
1011 * @skb: The socket data to send, skb->len MUST BE <= 7
1012 *
1013 * Send the socket data in the parameter list in the iucv message
1014 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1015 * list and the socket data len at index 7 (last byte).
1016 * See also iucv_msg_length().
1017 *
1018 * Returns the error code from the iucv_message_send() call.
1019 */
1020 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1021 struct sk_buff *skb)
1022 {
1023 u8 prmdata[8];
1024
1025 memcpy(prmdata, (void *) skb->data, skb->len);
1026 prmdata[7] = 0xff - (u8) skb->len;
1027 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1028 (void *) prmdata, 8);
1029 }
1030
1031 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1032 size_t len)
1033 {
1034 struct sock *sk = sock->sk;
1035 struct iucv_sock *iucv = iucv_sk(sk);
1036 size_t headroom, linear;
1037 struct sk_buff *skb;
1038 struct iucv_message txmsg = {0};
1039 struct cmsghdr *cmsg;
1040 int cmsg_done;
1041 long timeo;
1042 char user_id[9];
1043 char appl_id[9];
1044 int err;
1045 int noblock = msg->msg_flags & MSG_DONTWAIT;
1046
1047 err = sock_error(sk);
1048 if (err)
1049 return err;
1050
1051 if (msg->msg_flags & MSG_OOB)
1052 return -EOPNOTSUPP;
1053
1054 /* SOCK_SEQPACKET: we do not support segmented records */
1055 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1056 return -EOPNOTSUPP;
1057
1058 lock_sock(sk);
1059
1060 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1061 err = -EPIPE;
1062 goto out;
1063 }
1064
1065 /* Return if the socket is not in connected state */
1066 if (sk->sk_state != IUCV_CONNECTED) {
1067 err = -ENOTCONN;
1068 goto out;
1069 }
1070
1071 /* initialize defaults */
1072 cmsg_done = 0; /* check for duplicate headers */
1073 txmsg.class = 0;
1074
1075 /* iterate over control messages */
1076 for_each_cmsghdr(cmsg, msg) {
1077 if (!CMSG_OK(msg, cmsg)) {
1078 err = -EINVAL;
1079 goto out;
1080 }
1081
1082 if (cmsg->cmsg_level != SOL_IUCV)
1083 continue;
1084
1085 if (cmsg->cmsg_type & cmsg_done) {
1086 err = -EINVAL;
1087 goto out;
1088 }
1089 cmsg_done |= cmsg->cmsg_type;
1090
1091 switch (cmsg->cmsg_type) {
1092 case SCM_IUCV_TRGCLS:
1093 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1094 err = -EINVAL;
1095 goto out;
1096 }
1097
1098 /* set iucv message target class */
1099 memcpy(&txmsg.class,
1100 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1101
1102 break;
1103
1104 default:
1105 err = -EINVAL;
1106 goto out;
1107 }
1108 }
1109
1110 /* allocate one skb for each iucv message:
1111 * this is fine for SOCK_SEQPACKET (unless we want to support
1112 * segmented records using the MSG_EOR flag), but
1113 * for SOCK_STREAM we might want to improve it in future */
1114 headroom = (iucv->transport == AF_IUCV_TRANS_HIPER)
1115 ? sizeof(struct af_iucv_trans_hdr) + ETH_HLEN : 0;
1116 if (headroom + len < PAGE_SIZE) {
1117 linear = len;
1118 } else {
1119 /* In nonlinear "classic" iucv skb,
1120 * reserve space for iucv_array
1121 */
1122 if (iucv->transport != AF_IUCV_TRANS_HIPER)
1123 headroom += sizeof(struct iucv_array) *
1124 (MAX_SKB_FRAGS + 1);
1125 linear = PAGE_SIZE - headroom;
1126 }
1127 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1128 noblock, &err, 0);
1129 if (!skb)
1130 goto out;
1131 if (headroom)
1132 skb_reserve(skb, headroom);
1133 skb_put(skb, linear);
1134 skb->len = len;
1135 skb->data_len = len - linear;
1136 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1137 if (err)
1138 goto fail;
1139
1140 /* wait if outstanding messages for iucv path has reached */
1141 timeo = sock_sndtimeo(sk, noblock);
1142 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1143 if (err)
1144 goto fail;
1145
1146 /* return -ECONNRESET if the socket is no longer connected */
1147 if (sk->sk_state != IUCV_CONNECTED) {
1148 err = -ECONNRESET;
1149 goto fail;
1150 }
1151
1152 /* increment and save iucv message tag for msg_completion cbk */
1153 txmsg.tag = iucv->send_tag++;
1154 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1155
1156 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1157 atomic_inc(&iucv->msg_sent);
1158 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1159 if (err) {
1160 atomic_dec(&iucv->msg_sent);
1161 goto fail;
1162 }
1163 } else { /* Classic VM IUCV transport */
1164 skb_queue_tail(&iucv->send_skb_q, skb);
1165
1166 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1167 skb->len <= 7) {
1168 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1169
1170 /* on success: there is no message_complete callback */
1171 /* for an IPRMDATA msg; remove skb from send queue */
1172 if (err == 0) {
1173 skb_unlink(skb, &iucv->send_skb_q);
1174 kfree_skb(skb);
1175 }
1176
1177 /* this error should never happen since the */
1178 /* IUCV_IPRMDATA path flag is set... sever path */
1179 if (err == 0x15) {
1180 pr_iucv->path_sever(iucv->path, NULL);
1181 skb_unlink(skb, &iucv->send_skb_q);
1182 err = -EPIPE;
1183 goto fail;
1184 }
1185 } else if (skb_is_nonlinear(skb)) {
1186 struct iucv_array *iba = (struct iucv_array *)skb->head;
1187 int i;
1188
1189 /* skip iucv_array lying in the headroom */
1190 iba[0].address = (u32)(addr_t)skb->data;
1191 iba[0].length = (u32)skb_headlen(skb);
1192 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1193 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1194
1195 iba[i + 1].address =
1196 (u32)(addr_t)skb_frag_address(frag);
1197 iba[i + 1].length = (u32)skb_frag_size(frag);
1198 }
1199 err = pr_iucv->message_send(iucv->path, &txmsg,
1200 IUCV_IPBUFLST, 0,
1201 (void *)iba, skb->len);
1202 } else { /* non-IPRM Linear skb */
1203 err = pr_iucv->message_send(iucv->path, &txmsg,
1204 0, 0, (void *)skb->data, skb->len);
1205 }
1206 if (err) {
1207 if (err == 3) {
1208 user_id[8] = 0;
1209 memcpy(user_id, iucv->dst_user_id, 8);
1210 appl_id[8] = 0;
1211 memcpy(appl_id, iucv->dst_name, 8);
1212 pr_err(
1213 "Application %s on z/VM guest %s exceeds message limit\n",
1214 appl_id, user_id);
1215 err = -EAGAIN;
1216 } else {
1217 err = -EPIPE;
1218 }
1219 skb_unlink(skb, &iucv->send_skb_q);
1220 goto fail;
1221 }
1222 }
1223
1224 release_sock(sk);
1225 return len;
1226
1227 fail:
1228 kfree_skb(skb);
1229 out:
1230 release_sock(sk);
1231 return err;
1232 }
1233
1234 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1235 {
1236 size_t headroom, linear;
1237 struct sk_buff *skb;
1238 int err;
1239
1240 if (len < PAGE_SIZE) {
1241 headroom = 0;
1242 linear = len;
1243 } else {
1244 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1245 linear = PAGE_SIZE - headroom;
1246 }
1247 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1248 0, &err, GFP_ATOMIC | GFP_DMA);
1249 WARN_ONCE(!skb,
1250 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1251 len, err);
1252 if (skb) {
1253 if (headroom)
1254 skb_reserve(skb, headroom);
1255 skb_put(skb, linear);
1256 skb->len = len;
1257 skb->data_len = len - linear;
1258 }
1259 return skb;
1260 }
1261
1262 /* iucv_process_message() - Receive a single outstanding IUCV message
1263 *
1264 * Locking: must be called with message_q.lock held
1265 */
1266 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1267 struct iucv_path *path,
1268 struct iucv_message *msg)
1269 {
1270 int rc;
1271 unsigned int len;
1272
1273 len = iucv_msg_length(msg);
1274
1275 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1276 /* Note: the first 4 bytes are reserved for msg tag */
1277 IUCV_SKB_CB(skb)->class = msg->class;
1278
1279 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1280 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1281 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1282 skb->data = NULL;
1283 skb->len = 0;
1284 }
1285 } else {
1286 if (skb_is_nonlinear(skb)) {
1287 struct iucv_array *iba = (struct iucv_array *)skb->head;
1288 int i;
1289
1290 iba[0].address = (u32)(addr_t)skb->data;
1291 iba[0].length = (u32)skb_headlen(skb);
1292 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1293 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1294
1295 iba[i + 1].address =
1296 (u32)(addr_t)skb_frag_address(frag);
1297 iba[i + 1].length = (u32)skb_frag_size(frag);
1298 }
1299 rc = pr_iucv->message_receive(path, msg,
1300 IUCV_IPBUFLST,
1301 (void *)iba, len, NULL);
1302 } else {
1303 rc = pr_iucv->message_receive(path, msg,
1304 msg->flags & IUCV_IPRMDATA,
1305 skb->data, len, NULL);
1306 }
1307 if (rc) {
1308 kfree_skb(skb);
1309 return;
1310 }
1311 WARN_ON_ONCE(skb->len != len);
1312 }
1313
1314 IUCV_SKB_CB(skb)->offset = 0;
1315 if (sock_queue_rcv_skb(sk, skb))
1316 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1317 }
1318
1319 /* iucv_process_message_q() - Process outstanding IUCV messages
1320 *
1321 * Locking: must be called with message_q.lock held
1322 */
1323 static void iucv_process_message_q(struct sock *sk)
1324 {
1325 struct iucv_sock *iucv = iucv_sk(sk);
1326 struct sk_buff *skb;
1327 struct sock_msg_q *p, *n;
1328
1329 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1330 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1331 if (!skb)
1332 break;
1333 iucv_process_message(sk, skb, p->path, &p->msg);
1334 list_del(&p->list);
1335 kfree(p);
1336 if (!skb_queue_empty(&iucv->backlog_skb_q))
1337 break;
1338 }
1339 }
1340
1341 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1342 size_t len, int flags)
1343 {
1344 int noblock = flags & MSG_DONTWAIT;
1345 struct sock *sk = sock->sk;
1346 struct iucv_sock *iucv = iucv_sk(sk);
1347 unsigned int copied, rlen;
1348 struct sk_buff *skb, *rskb, *cskb;
1349 int err = 0;
1350 u32 offset;
1351
1352 if ((sk->sk_state == IUCV_DISCONN) &&
1353 skb_queue_empty(&iucv->backlog_skb_q) &&
1354 skb_queue_empty(&sk->sk_receive_queue) &&
1355 list_empty(&iucv->message_q.list))
1356 return 0;
1357
1358 if (flags & (MSG_OOB))
1359 return -EOPNOTSUPP;
1360
1361 /* receive/dequeue next skb:
1362 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1363 skb = skb_recv_datagram(sk, flags, noblock, &err);
1364 if (!skb) {
1365 if (sk->sk_shutdown & RCV_SHUTDOWN)
1366 return 0;
1367 return err;
1368 }
1369
1370 offset = IUCV_SKB_CB(skb)->offset;
1371 rlen = skb->len - offset; /* real length of skb */
1372 copied = min_t(unsigned int, rlen, len);
1373 if (!rlen)
1374 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1375
1376 cskb = skb;
1377 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1378 if (!(flags & MSG_PEEK))
1379 skb_queue_head(&sk->sk_receive_queue, skb);
1380 return -EFAULT;
1381 }
1382
1383 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1384 if (sk->sk_type == SOCK_SEQPACKET) {
1385 if (copied < rlen)
1386 msg->msg_flags |= MSG_TRUNC;
1387 /* each iucv message contains a complete record */
1388 msg->msg_flags |= MSG_EOR;
1389 }
1390
1391 /* create control message to store iucv msg target class:
1392 * get the trgcls from the control buffer of the skb due to
1393 * fragmentation of original iucv message. */
1394 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1395 sizeof(IUCV_SKB_CB(skb)->class),
1396 (void *)&IUCV_SKB_CB(skb)->class);
1397 if (err) {
1398 if (!(flags & MSG_PEEK))
1399 skb_queue_head(&sk->sk_receive_queue, skb);
1400 return err;
1401 }
1402
1403 /* Mark read part of skb as used */
1404 if (!(flags & MSG_PEEK)) {
1405
1406 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1407 if (sk->sk_type == SOCK_STREAM) {
1408 if (copied < rlen) {
1409 IUCV_SKB_CB(skb)->offset = offset + copied;
1410 skb_queue_head(&sk->sk_receive_queue, skb);
1411 goto done;
1412 }
1413 }
1414
1415 kfree_skb(skb);
1416 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1417 atomic_inc(&iucv->msg_recv);
1418 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1419 WARN_ON(1);
1420 iucv_sock_close(sk);
1421 return -EFAULT;
1422 }
1423 }
1424
1425 /* Queue backlog skbs */
1426 spin_lock_bh(&iucv->message_q.lock);
1427 rskb = skb_dequeue(&iucv->backlog_skb_q);
1428 while (rskb) {
1429 IUCV_SKB_CB(rskb)->offset = 0;
1430 if (sock_queue_rcv_skb(sk, rskb)) {
1431 skb_queue_head(&iucv->backlog_skb_q,
1432 rskb);
1433 break;
1434 } else {
1435 rskb = skb_dequeue(&iucv->backlog_skb_q);
1436 }
1437 }
1438 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1439 if (!list_empty(&iucv->message_q.list))
1440 iucv_process_message_q(sk);
1441 if (atomic_read(&iucv->msg_recv) >=
1442 iucv->msglimit / 2) {
1443 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1444 if (err) {
1445 sk->sk_state = IUCV_DISCONN;
1446 sk->sk_state_change(sk);
1447 }
1448 }
1449 }
1450 spin_unlock_bh(&iucv->message_q.lock);
1451 }
1452
1453 done:
1454 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1455 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1456 copied = rlen;
1457
1458 return copied;
1459 }
1460
1461 static inline unsigned int iucv_accept_poll(struct sock *parent)
1462 {
1463 struct iucv_sock *isk, *n;
1464 struct sock *sk;
1465
1466 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1467 sk = (struct sock *) isk;
1468
1469 if (sk->sk_state == IUCV_CONNECTED)
1470 return POLLIN | POLLRDNORM;
1471 }
1472
1473 return 0;
1474 }
1475
1476 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1477 poll_table *wait)
1478 {
1479 struct sock *sk = sock->sk;
1480 unsigned int mask = 0;
1481
1482 sock_poll_wait(file, sk_sleep(sk), wait);
1483
1484 if (sk->sk_state == IUCV_LISTEN)
1485 return iucv_accept_poll(sk);
1486
1487 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1488 mask |= POLLERR |
1489 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1490
1491 if (sk->sk_shutdown & RCV_SHUTDOWN)
1492 mask |= POLLRDHUP;
1493
1494 if (sk->sk_shutdown == SHUTDOWN_MASK)
1495 mask |= POLLHUP;
1496
1497 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1498 (sk->sk_shutdown & RCV_SHUTDOWN))
1499 mask |= POLLIN | POLLRDNORM;
1500
1501 if (sk->sk_state == IUCV_CLOSED)
1502 mask |= POLLHUP;
1503
1504 if (sk->sk_state == IUCV_DISCONN)
1505 mask |= POLLIN;
1506
1507 if (sock_writeable(sk) && iucv_below_msglim(sk))
1508 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1509 else
1510 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1511
1512 return mask;
1513 }
1514
1515 static int iucv_sock_shutdown(struct socket *sock, int how)
1516 {
1517 struct sock *sk = sock->sk;
1518 struct iucv_sock *iucv = iucv_sk(sk);
1519 struct iucv_message txmsg;
1520 int err = 0;
1521
1522 how++;
1523
1524 if ((how & ~SHUTDOWN_MASK) || !how)
1525 return -EINVAL;
1526
1527 lock_sock(sk);
1528 switch (sk->sk_state) {
1529 case IUCV_LISTEN:
1530 case IUCV_DISCONN:
1531 case IUCV_CLOSING:
1532 case IUCV_CLOSED:
1533 err = -ENOTCONN;
1534 goto fail;
1535 default:
1536 break;
1537 }
1538
1539 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1540 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1541 txmsg.class = 0;
1542 txmsg.tag = 0;
1543 err = pr_iucv->message_send(iucv->path, &txmsg,
1544 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1545 if (err) {
1546 switch (err) {
1547 case 1:
1548 err = -ENOTCONN;
1549 break;
1550 case 2:
1551 err = -ECONNRESET;
1552 break;
1553 default:
1554 err = -ENOTCONN;
1555 break;
1556 }
1557 }
1558 } else
1559 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1560 }
1561
1562 sk->sk_shutdown |= how;
1563 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1564 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1565 iucv->path) {
1566 err = pr_iucv->path_quiesce(iucv->path, NULL);
1567 if (err)
1568 err = -ENOTCONN;
1569 /* skb_queue_purge(&sk->sk_receive_queue); */
1570 }
1571 skb_queue_purge(&sk->sk_receive_queue);
1572 }
1573
1574 /* Wake up anyone sleeping in poll */
1575 sk->sk_state_change(sk);
1576
1577 fail:
1578 release_sock(sk);
1579 return err;
1580 }
1581
1582 static int iucv_sock_release(struct socket *sock)
1583 {
1584 struct sock *sk = sock->sk;
1585 int err = 0;
1586
1587 if (!sk)
1588 return 0;
1589
1590 iucv_sock_close(sk);
1591
1592 sock_orphan(sk);
1593 iucv_sock_kill(sk);
1594 return err;
1595 }
1596
1597 /* getsockopt and setsockopt */
1598 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1599 char __user *optval, unsigned int optlen)
1600 {
1601 struct sock *sk = sock->sk;
1602 struct iucv_sock *iucv = iucv_sk(sk);
1603 int val;
1604 int rc;
1605
1606 if (level != SOL_IUCV)
1607 return -ENOPROTOOPT;
1608
1609 if (optlen < sizeof(int))
1610 return -EINVAL;
1611
1612 if (get_user(val, (int __user *) optval))
1613 return -EFAULT;
1614
1615 rc = 0;
1616
1617 lock_sock(sk);
1618 switch (optname) {
1619 case SO_IPRMDATA_MSG:
1620 if (val)
1621 iucv->flags |= IUCV_IPRMDATA;
1622 else
1623 iucv->flags &= ~IUCV_IPRMDATA;
1624 break;
1625 case SO_MSGLIMIT:
1626 switch (sk->sk_state) {
1627 case IUCV_OPEN:
1628 case IUCV_BOUND:
1629 if (val < 1 || val > (u16)(~0))
1630 rc = -EINVAL;
1631 else
1632 iucv->msglimit = val;
1633 break;
1634 default:
1635 rc = -EINVAL;
1636 break;
1637 }
1638 break;
1639 default:
1640 rc = -ENOPROTOOPT;
1641 break;
1642 }
1643 release_sock(sk);
1644
1645 return rc;
1646 }
1647
1648 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1649 char __user *optval, int __user *optlen)
1650 {
1651 struct sock *sk = sock->sk;
1652 struct iucv_sock *iucv = iucv_sk(sk);
1653 unsigned int val;
1654 int len;
1655
1656 if (level != SOL_IUCV)
1657 return -ENOPROTOOPT;
1658
1659 if (get_user(len, optlen))
1660 return -EFAULT;
1661
1662 if (len < 0)
1663 return -EINVAL;
1664
1665 len = min_t(unsigned int, len, sizeof(int));
1666
1667 switch (optname) {
1668 case SO_IPRMDATA_MSG:
1669 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1670 break;
1671 case SO_MSGLIMIT:
1672 lock_sock(sk);
1673 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1674 : iucv->msglimit; /* default */
1675 release_sock(sk);
1676 break;
1677 case SO_MSGSIZE:
1678 if (sk->sk_state == IUCV_OPEN)
1679 return -EBADFD;
1680 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1681 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1682 0x7fffffff;
1683 break;
1684 default:
1685 return -ENOPROTOOPT;
1686 }
1687
1688 if (put_user(len, optlen))
1689 return -EFAULT;
1690 if (copy_to_user(optval, &val, len))
1691 return -EFAULT;
1692
1693 return 0;
1694 }
1695
1696
1697 /* Callback wrappers - called from iucv base support */
1698 static int iucv_callback_connreq(struct iucv_path *path,
1699 u8 ipvmid[8], u8 ipuser[16])
1700 {
1701 unsigned char user_data[16];
1702 unsigned char nuser_data[16];
1703 unsigned char src_name[8];
1704 struct sock *sk, *nsk;
1705 struct iucv_sock *iucv, *niucv;
1706 int err;
1707
1708 memcpy(src_name, ipuser, 8);
1709 EBCASC(src_name, 8);
1710 /* Find out if this path belongs to af_iucv. */
1711 read_lock(&iucv_sk_list.lock);
1712 iucv = NULL;
1713 sk = NULL;
1714 sk_for_each(sk, &iucv_sk_list.head)
1715 if (sk->sk_state == IUCV_LISTEN &&
1716 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1717 /*
1718 * Found a listening socket with
1719 * src_name == ipuser[0-7].
1720 */
1721 iucv = iucv_sk(sk);
1722 break;
1723 }
1724 read_unlock(&iucv_sk_list.lock);
1725 if (!iucv)
1726 /* No socket found, not one of our paths. */
1727 return -EINVAL;
1728
1729 bh_lock_sock(sk);
1730
1731 /* Check if parent socket is listening */
1732 low_nmcpy(user_data, iucv->src_name);
1733 high_nmcpy(user_data, iucv->dst_name);
1734 ASCEBC(user_data, sizeof(user_data));
1735 if (sk->sk_state != IUCV_LISTEN) {
1736 err = pr_iucv->path_sever(path, user_data);
1737 iucv_path_free(path);
1738 goto fail;
1739 }
1740
1741 /* Check for backlog size */
1742 if (sk_acceptq_is_full(sk)) {
1743 err = pr_iucv->path_sever(path, user_data);
1744 iucv_path_free(path);
1745 goto fail;
1746 }
1747
1748 /* Create the new socket */
1749 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1750 if (!nsk) {
1751 err = pr_iucv->path_sever(path, user_data);
1752 iucv_path_free(path);
1753 goto fail;
1754 }
1755
1756 niucv = iucv_sk(nsk);
1757 iucv_sock_init(nsk, sk);
1758
1759 /* Set the new iucv_sock */
1760 memcpy(niucv->dst_name, ipuser + 8, 8);
1761 EBCASC(niucv->dst_name, 8);
1762 memcpy(niucv->dst_user_id, ipvmid, 8);
1763 memcpy(niucv->src_name, iucv->src_name, 8);
1764 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1765 niucv->path = path;
1766
1767 /* Call iucv_accept */
1768 high_nmcpy(nuser_data, ipuser + 8);
1769 memcpy(nuser_data + 8, niucv->src_name, 8);
1770 ASCEBC(nuser_data + 8, 8);
1771
1772 /* set message limit for path based on msglimit of accepting socket */
1773 niucv->msglimit = iucv->msglimit;
1774 path->msglim = iucv->msglimit;
1775 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1776 if (err) {
1777 iucv_sever_path(nsk, 1);
1778 iucv_sock_kill(nsk);
1779 goto fail;
1780 }
1781
1782 iucv_accept_enqueue(sk, nsk);
1783
1784 /* Wake up accept */
1785 nsk->sk_state = IUCV_CONNECTED;
1786 sk->sk_data_ready(sk);
1787 err = 0;
1788 fail:
1789 bh_unlock_sock(sk);
1790 return 0;
1791 }
1792
1793 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1794 {
1795 struct sock *sk = path->private;
1796
1797 sk->sk_state = IUCV_CONNECTED;
1798 sk->sk_state_change(sk);
1799 }
1800
1801 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1802 {
1803 struct sock *sk = path->private;
1804 struct iucv_sock *iucv = iucv_sk(sk);
1805 struct sk_buff *skb;
1806 struct sock_msg_q *save_msg;
1807 int len;
1808
1809 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1810 pr_iucv->message_reject(path, msg);
1811 return;
1812 }
1813
1814 spin_lock(&iucv->message_q.lock);
1815
1816 if (!list_empty(&iucv->message_q.list) ||
1817 !skb_queue_empty(&iucv->backlog_skb_q))
1818 goto save_message;
1819
1820 len = atomic_read(&sk->sk_rmem_alloc);
1821 len += SKB_TRUESIZE(iucv_msg_length(msg));
1822 if (len > sk->sk_rcvbuf)
1823 goto save_message;
1824
1825 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1826 if (!skb)
1827 goto save_message;
1828
1829 iucv_process_message(sk, skb, path, msg);
1830 goto out_unlock;
1831
1832 save_message:
1833 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1834 if (!save_msg)
1835 goto out_unlock;
1836 save_msg->path = path;
1837 save_msg->msg = *msg;
1838
1839 list_add_tail(&save_msg->list, &iucv->message_q.list);
1840
1841 out_unlock:
1842 spin_unlock(&iucv->message_q.lock);
1843 }
1844
1845 static void iucv_callback_txdone(struct iucv_path *path,
1846 struct iucv_message *msg)
1847 {
1848 struct sock *sk = path->private;
1849 struct sk_buff *this = NULL;
1850 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1851 struct sk_buff *list_skb = list->next;
1852 unsigned long flags;
1853
1854 bh_lock_sock(sk);
1855 if (!skb_queue_empty(list)) {
1856 spin_lock_irqsave(&list->lock, flags);
1857
1858 while (list_skb != (struct sk_buff *)list) {
1859 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1860 this = list_skb;
1861 break;
1862 }
1863 list_skb = list_skb->next;
1864 }
1865 if (this)
1866 __skb_unlink(this, list);
1867
1868 spin_unlock_irqrestore(&list->lock, flags);
1869
1870 if (this) {
1871 kfree_skb(this);
1872 /* wake up any process waiting for sending */
1873 iucv_sock_wake_msglim(sk);
1874 }
1875 }
1876
1877 if (sk->sk_state == IUCV_CLOSING) {
1878 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1879 sk->sk_state = IUCV_CLOSED;
1880 sk->sk_state_change(sk);
1881 }
1882 }
1883 bh_unlock_sock(sk);
1884
1885 }
1886
1887 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1888 {
1889 struct sock *sk = path->private;
1890
1891 if (sk->sk_state == IUCV_CLOSED)
1892 return;
1893
1894 bh_lock_sock(sk);
1895 iucv_sever_path(sk, 1);
1896 sk->sk_state = IUCV_DISCONN;
1897
1898 sk->sk_state_change(sk);
1899 bh_unlock_sock(sk);
1900 }
1901
1902 /* called if the other communication side shuts down its RECV direction;
1903 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1904 */
1905 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1906 {
1907 struct sock *sk = path->private;
1908
1909 bh_lock_sock(sk);
1910 if (sk->sk_state != IUCV_CLOSED) {
1911 sk->sk_shutdown |= SEND_SHUTDOWN;
1912 sk->sk_state_change(sk);
1913 }
1914 bh_unlock_sock(sk);
1915 }
1916
1917 /***************** HiperSockets transport callbacks ********************/
1918 static void afiucv_swap_src_dest(struct sk_buff *skb)
1919 {
1920 struct af_iucv_trans_hdr *trans_hdr =
1921 (struct af_iucv_trans_hdr *)skb->data;
1922 char tmpID[8];
1923 char tmpName[8];
1924
1925 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1926 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1927 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1928 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1929 memcpy(tmpID, trans_hdr->srcUserID, 8);
1930 memcpy(tmpName, trans_hdr->srcAppName, 8);
1931 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1932 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1933 memcpy(trans_hdr->destUserID, tmpID, 8);
1934 memcpy(trans_hdr->destAppName, tmpName, 8);
1935 skb_push(skb, ETH_HLEN);
1936 memset(skb->data, 0, ETH_HLEN);
1937 }
1938
1939 /**
1940 * afiucv_hs_callback_syn - react on received SYN
1941 **/
1942 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1943 {
1944 struct sock *nsk;
1945 struct iucv_sock *iucv, *niucv;
1946 struct af_iucv_trans_hdr *trans_hdr;
1947 int err;
1948
1949 iucv = iucv_sk(sk);
1950 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1951 if (!iucv) {
1952 /* no sock - connection refused */
1953 afiucv_swap_src_dest(skb);
1954 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1955 err = dev_queue_xmit(skb);
1956 goto out;
1957 }
1958
1959 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1960 bh_lock_sock(sk);
1961 if ((sk->sk_state != IUCV_LISTEN) ||
1962 sk_acceptq_is_full(sk) ||
1963 !nsk) {
1964 /* error on server socket - connection refused */
1965 afiucv_swap_src_dest(skb);
1966 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1967 err = dev_queue_xmit(skb);
1968 iucv_sock_kill(nsk);
1969 bh_unlock_sock(sk);
1970 goto out;
1971 }
1972
1973 niucv = iucv_sk(nsk);
1974 iucv_sock_init(nsk, sk);
1975 niucv->transport = AF_IUCV_TRANS_HIPER;
1976 niucv->msglimit = iucv->msglimit;
1977 if (!trans_hdr->window)
1978 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1979 else
1980 niucv->msglimit_peer = trans_hdr->window;
1981 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1982 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1983 memcpy(niucv->src_name, iucv->src_name, 8);
1984 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1985 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1986 niucv->hs_dev = iucv->hs_dev;
1987 dev_hold(niucv->hs_dev);
1988 afiucv_swap_src_dest(skb);
1989 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1990 trans_hdr->window = niucv->msglimit;
1991 /* if receiver acks the xmit connection is established */
1992 err = dev_queue_xmit(skb);
1993 if (!err) {
1994 iucv_accept_enqueue(sk, nsk);
1995 nsk->sk_state = IUCV_CONNECTED;
1996 sk->sk_data_ready(sk);
1997 } else
1998 iucv_sock_kill(nsk);
1999 bh_unlock_sock(sk);
2000
2001 out:
2002 return NET_RX_SUCCESS;
2003 }
2004
2005 /**
2006 * afiucv_hs_callback_synack() - react on received SYN-ACK
2007 **/
2008 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2009 {
2010 struct iucv_sock *iucv = iucv_sk(sk);
2011 struct af_iucv_trans_hdr *trans_hdr =
2012 (struct af_iucv_trans_hdr *)skb->data;
2013
2014 if (!iucv)
2015 goto out;
2016 if (sk->sk_state != IUCV_BOUND)
2017 goto out;
2018 bh_lock_sock(sk);
2019 iucv->msglimit_peer = trans_hdr->window;
2020 sk->sk_state = IUCV_CONNECTED;
2021 sk->sk_state_change(sk);
2022 bh_unlock_sock(sk);
2023 out:
2024 kfree_skb(skb);
2025 return NET_RX_SUCCESS;
2026 }
2027
2028 /**
2029 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2030 **/
2031 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2032 {
2033 struct iucv_sock *iucv = iucv_sk(sk);
2034
2035 if (!iucv)
2036 goto out;
2037 if (sk->sk_state != IUCV_BOUND)
2038 goto out;
2039 bh_lock_sock(sk);
2040 sk->sk_state = IUCV_DISCONN;
2041 sk->sk_state_change(sk);
2042 bh_unlock_sock(sk);
2043 out:
2044 kfree_skb(skb);
2045 return NET_RX_SUCCESS;
2046 }
2047
2048 /**
2049 * afiucv_hs_callback_fin() - react on received FIN
2050 **/
2051 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2052 {
2053 struct iucv_sock *iucv = iucv_sk(sk);
2054
2055 /* other end of connection closed */
2056 if (!iucv)
2057 goto out;
2058 bh_lock_sock(sk);
2059 if (sk->sk_state == IUCV_CONNECTED) {
2060 sk->sk_state = IUCV_DISCONN;
2061 sk->sk_state_change(sk);
2062 }
2063 bh_unlock_sock(sk);
2064 out:
2065 kfree_skb(skb);
2066 return NET_RX_SUCCESS;
2067 }
2068
2069 /**
2070 * afiucv_hs_callback_win() - react on received WIN
2071 **/
2072 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2073 {
2074 struct iucv_sock *iucv = iucv_sk(sk);
2075 struct af_iucv_trans_hdr *trans_hdr =
2076 (struct af_iucv_trans_hdr *)skb->data;
2077
2078 if (!iucv)
2079 return NET_RX_SUCCESS;
2080
2081 if (sk->sk_state != IUCV_CONNECTED)
2082 return NET_RX_SUCCESS;
2083
2084 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2085 iucv_sock_wake_msglim(sk);
2086 return NET_RX_SUCCESS;
2087 }
2088
2089 /**
2090 * afiucv_hs_callback_rx() - react on received data
2091 **/
2092 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2093 {
2094 struct iucv_sock *iucv = iucv_sk(sk);
2095
2096 if (!iucv) {
2097 kfree_skb(skb);
2098 return NET_RX_SUCCESS;
2099 }
2100
2101 if (sk->sk_state != IUCV_CONNECTED) {
2102 kfree_skb(skb);
2103 return NET_RX_SUCCESS;
2104 }
2105
2106 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2107 kfree_skb(skb);
2108 return NET_RX_SUCCESS;
2109 }
2110
2111 /* write stuff from iucv_msg to skb cb */
2112 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2113 skb_reset_transport_header(skb);
2114 skb_reset_network_header(skb);
2115 IUCV_SKB_CB(skb)->offset = 0;
2116 spin_lock(&iucv->message_q.lock);
2117 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2118 if (sock_queue_rcv_skb(sk, skb)) {
2119 /* handle rcv queue full */
2120 skb_queue_tail(&iucv->backlog_skb_q, skb);
2121 }
2122 } else
2123 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2124 spin_unlock(&iucv->message_q.lock);
2125 return NET_RX_SUCCESS;
2126 }
2127
2128 /**
2129 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2130 * transport
2131 * called from netif RX softirq
2132 **/
2133 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2134 struct packet_type *pt, struct net_device *orig_dev)
2135 {
2136 struct sock *sk;
2137 struct iucv_sock *iucv;
2138 struct af_iucv_trans_hdr *trans_hdr;
2139 char nullstring[8];
2140 int err = 0;
2141
2142 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2143 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2144 (int)skb->len,
2145 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2146 kfree_skb(skb);
2147 return NET_RX_SUCCESS;
2148 }
2149 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2150 if (skb_linearize(skb)) {
2151 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2152 (int)skb->len);
2153 kfree_skb(skb);
2154 return NET_RX_SUCCESS;
2155 }
2156 skb_pull(skb, ETH_HLEN);
2157 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2158 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2159 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2160 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2161 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2162 memset(nullstring, 0, sizeof(nullstring));
2163 iucv = NULL;
2164 sk = NULL;
2165 read_lock(&iucv_sk_list.lock);
2166 sk_for_each(sk, &iucv_sk_list.head) {
2167 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2168 if ((!memcmp(&iucv_sk(sk)->src_name,
2169 trans_hdr->destAppName, 8)) &&
2170 (!memcmp(&iucv_sk(sk)->src_user_id,
2171 trans_hdr->destUserID, 8)) &&
2172 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2173 (!memcmp(&iucv_sk(sk)->dst_user_id,
2174 nullstring, 8))) {
2175 iucv = iucv_sk(sk);
2176 break;
2177 }
2178 } else {
2179 if ((!memcmp(&iucv_sk(sk)->src_name,
2180 trans_hdr->destAppName, 8)) &&
2181 (!memcmp(&iucv_sk(sk)->src_user_id,
2182 trans_hdr->destUserID, 8)) &&
2183 (!memcmp(&iucv_sk(sk)->dst_name,
2184 trans_hdr->srcAppName, 8)) &&
2185 (!memcmp(&iucv_sk(sk)->dst_user_id,
2186 trans_hdr->srcUserID, 8))) {
2187 iucv = iucv_sk(sk);
2188 break;
2189 }
2190 }
2191 }
2192 read_unlock(&iucv_sk_list.lock);
2193 if (!iucv)
2194 sk = NULL;
2195
2196 /* no sock
2197 how should we send with no sock
2198 1) send without sock no send rc checking?
2199 2) introduce default sock to handle this cases
2200
2201 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2202 data -> send FIN
2203 SYN|ACK, SYN|FIN, FIN -> no action? */
2204
2205 switch (trans_hdr->flags) {
2206 case AF_IUCV_FLAG_SYN:
2207 /* connect request */
2208 err = afiucv_hs_callback_syn(sk, skb);
2209 break;
2210 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2211 /* connect request confirmed */
2212 err = afiucv_hs_callback_synack(sk, skb);
2213 break;
2214 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2215 /* connect request refused */
2216 err = afiucv_hs_callback_synfin(sk, skb);
2217 break;
2218 case (AF_IUCV_FLAG_FIN):
2219 /* close request */
2220 err = afiucv_hs_callback_fin(sk, skb);
2221 break;
2222 case (AF_IUCV_FLAG_WIN):
2223 err = afiucv_hs_callback_win(sk, skb);
2224 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2225 kfree_skb(skb);
2226 break;
2227 }
2228 /* fall through and receive non-zero length data */
2229 case (AF_IUCV_FLAG_SHT):
2230 /* shutdown request */
2231 /* fall through and receive zero length data */
2232 case 0:
2233 /* plain data frame */
2234 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2235 err = afiucv_hs_callback_rx(sk, skb);
2236 break;
2237 default:
2238 ;
2239 }
2240
2241 return err;
2242 }
2243
2244 /**
2245 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2246 * transport
2247 **/
2248 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2249 enum iucv_tx_notify n)
2250 {
2251 struct sock *isk = skb->sk;
2252 struct sock *sk = NULL;
2253 struct iucv_sock *iucv = NULL;
2254 struct sk_buff_head *list;
2255 struct sk_buff *list_skb;
2256 struct sk_buff *nskb;
2257 unsigned long flags;
2258
2259 read_lock_irqsave(&iucv_sk_list.lock, flags);
2260 sk_for_each(sk, &iucv_sk_list.head)
2261 if (sk == isk) {
2262 iucv = iucv_sk(sk);
2263 break;
2264 }
2265 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2266
2267 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2268 return;
2269
2270 list = &iucv->send_skb_q;
2271 spin_lock_irqsave(&list->lock, flags);
2272 if (skb_queue_empty(list))
2273 goto out_unlock;
2274 list_skb = list->next;
2275 nskb = list_skb->next;
2276 while (list_skb != (struct sk_buff *)list) {
2277 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2278 switch (n) {
2279 case TX_NOTIFY_OK:
2280 __skb_unlink(list_skb, list);
2281 kfree_skb(list_skb);
2282 iucv_sock_wake_msglim(sk);
2283 break;
2284 case TX_NOTIFY_PENDING:
2285 atomic_inc(&iucv->pendings);
2286 break;
2287 case TX_NOTIFY_DELAYED_OK:
2288 __skb_unlink(list_skb, list);
2289 atomic_dec(&iucv->pendings);
2290 if (atomic_read(&iucv->pendings) <= 0)
2291 iucv_sock_wake_msglim(sk);
2292 kfree_skb(list_skb);
2293 break;
2294 case TX_NOTIFY_UNREACHABLE:
2295 case TX_NOTIFY_DELAYED_UNREACHABLE:
2296 case TX_NOTIFY_TPQFULL: /* not yet used */
2297 case TX_NOTIFY_GENERALERROR:
2298 case TX_NOTIFY_DELAYED_GENERALERROR:
2299 __skb_unlink(list_skb, list);
2300 kfree_skb(list_skb);
2301 if (sk->sk_state == IUCV_CONNECTED) {
2302 sk->sk_state = IUCV_DISCONN;
2303 sk->sk_state_change(sk);
2304 }
2305 break;
2306 }
2307 break;
2308 }
2309 list_skb = nskb;
2310 nskb = nskb->next;
2311 }
2312 out_unlock:
2313 spin_unlock_irqrestore(&list->lock, flags);
2314
2315 if (sk->sk_state == IUCV_CLOSING) {
2316 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2317 sk->sk_state = IUCV_CLOSED;
2318 sk->sk_state_change(sk);
2319 }
2320 }
2321
2322 }
2323
2324 /*
2325 * afiucv_netdev_event: handle netdev notifier chain events
2326 */
2327 static int afiucv_netdev_event(struct notifier_block *this,
2328 unsigned long event, void *ptr)
2329 {
2330 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2331 struct sock *sk;
2332 struct iucv_sock *iucv;
2333
2334 switch (event) {
2335 case NETDEV_REBOOT:
2336 case NETDEV_GOING_DOWN:
2337 sk_for_each(sk, &iucv_sk_list.head) {
2338 iucv = iucv_sk(sk);
2339 if ((iucv->hs_dev == event_dev) &&
2340 (sk->sk_state == IUCV_CONNECTED)) {
2341 if (event == NETDEV_GOING_DOWN)
2342 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2343 sk->sk_state = IUCV_DISCONN;
2344 sk->sk_state_change(sk);
2345 }
2346 }
2347 break;
2348 case NETDEV_DOWN:
2349 case NETDEV_UNREGISTER:
2350 default:
2351 break;
2352 }
2353 return NOTIFY_DONE;
2354 }
2355
2356 static struct notifier_block afiucv_netdev_notifier = {
2357 .notifier_call = afiucv_netdev_event,
2358 };
2359
2360 static const struct proto_ops iucv_sock_ops = {
2361 .family = PF_IUCV,
2362 .owner = THIS_MODULE,
2363 .release = iucv_sock_release,
2364 .bind = iucv_sock_bind,
2365 .connect = iucv_sock_connect,
2366 .listen = iucv_sock_listen,
2367 .accept = iucv_sock_accept,
2368 .getname = iucv_sock_getname,
2369 .sendmsg = iucv_sock_sendmsg,
2370 .recvmsg = iucv_sock_recvmsg,
2371 .poll = iucv_sock_poll,
2372 .ioctl = sock_no_ioctl,
2373 .mmap = sock_no_mmap,
2374 .socketpair = sock_no_socketpair,
2375 .shutdown = iucv_sock_shutdown,
2376 .setsockopt = iucv_sock_setsockopt,
2377 .getsockopt = iucv_sock_getsockopt,
2378 };
2379
2380 static const struct net_proto_family iucv_sock_family_ops = {
2381 .family = AF_IUCV,
2382 .owner = THIS_MODULE,
2383 .create = iucv_sock_create,
2384 };
2385
2386 static struct packet_type iucv_packet_type = {
2387 .type = cpu_to_be16(ETH_P_AF_IUCV),
2388 .func = afiucv_hs_rcv,
2389 };
2390
2391 static int afiucv_iucv_init(void)
2392 {
2393 int err;
2394
2395 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2396 if (err)
2397 goto out;
2398 /* establish dummy device */
2399 af_iucv_driver.bus = pr_iucv->bus;
2400 err = driver_register(&af_iucv_driver);
2401 if (err)
2402 goto out_iucv;
2403 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2404 if (!af_iucv_dev) {
2405 err = -ENOMEM;
2406 goto out_driver;
2407 }
2408 dev_set_name(af_iucv_dev, "af_iucv");
2409 af_iucv_dev->bus = pr_iucv->bus;
2410 af_iucv_dev->parent = pr_iucv->root;
2411 af_iucv_dev->release = (void (*)(struct device *))kfree;
2412 af_iucv_dev->driver = &af_iucv_driver;
2413 err = device_register(af_iucv_dev);
2414 if (err)
2415 goto out_driver;
2416 return 0;
2417
2418 out_driver:
2419 driver_unregister(&af_iucv_driver);
2420 out_iucv:
2421 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2422 out:
2423 return err;
2424 }
2425
2426 static int __init afiucv_init(void)
2427 {
2428 int err;
2429
2430 if (MACHINE_IS_VM) {
2431 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2432 if (unlikely(err)) {
2433 WARN_ON(err);
2434 err = -EPROTONOSUPPORT;
2435 goto out;
2436 }
2437
2438 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2439 if (!pr_iucv) {
2440 printk(KERN_WARNING "iucv_if lookup failed\n");
2441 memset(&iucv_userid, 0, sizeof(iucv_userid));
2442 }
2443 } else {
2444 memset(&iucv_userid, 0, sizeof(iucv_userid));
2445 pr_iucv = NULL;
2446 }
2447
2448 err = proto_register(&iucv_proto, 0);
2449 if (err)
2450 goto out;
2451 err = sock_register(&iucv_sock_family_ops);
2452 if (err)
2453 goto out_proto;
2454
2455 if (pr_iucv) {
2456 err = afiucv_iucv_init();
2457 if (err)
2458 goto out_sock;
2459 } else
2460 register_netdevice_notifier(&afiucv_netdev_notifier);
2461 dev_add_pack(&iucv_packet_type);
2462 return 0;
2463
2464 out_sock:
2465 sock_unregister(PF_IUCV);
2466 out_proto:
2467 proto_unregister(&iucv_proto);
2468 out:
2469 if (pr_iucv)
2470 symbol_put(iucv_if);
2471 return err;
2472 }
2473
2474 static void __exit afiucv_exit(void)
2475 {
2476 if (pr_iucv) {
2477 device_unregister(af_iucv_dev);
2478 driver_unregister(&af_iucv_driver);
2479 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2480 symbol_put(iucv_if);
2481 } else
2482 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2483 dev_remove_pack(&iucv_packet_type);
2484 sock_unregister(PF_IUCV);
2485 proto_unregister(&iucv_proto);
2486 }
2487
2488 module_init(afiucv_init);
2489 module_exit(afiucv_exit);
2490
2491 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2492 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2493 MODULE_VERSION(VERSION);
2494 MODULE_LICENSE("GPL");
2495 MODULE_ALIAS_NETPROTO(PF_IUCV);
2496
Linux kernel - Deliverables
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