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Linux 4.8-rc8
[linux/fpc-iii.git] / net / iucv / af_iucv.c
blob02b45a8e8b35729a65c6d796136a846aa2df648b
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 <linux/security.h>
26 #include <net/sock.h>
27 #include <asm/ebcdic.h>
28 #include <asm/cpcmd.h>
29 #include <linux/kmod.h>
30
31 #include <net/iucv/af_iucv.h>
32
33 #define VERSION "1.2"
34
35 static char iucv_userid[80];
36
37 static const struct proto_ops iucv_sock_ops;
38
39 static struct proto iucv_proto = {
40 .name = "AF_IUCV",
41 .owner = THIS_MODULE,
42 .obj_size = sizeof(struct iucv_sock),
43 };
44
45 static struct iucv_interface *pr_iucv;
46
47 /* special AF_IUCV IPRM messages */
48 static const u8 iprm_shutdown[8] =
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
50
51 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
52
53 #define __iucv_sock_wait(sk, condition, timeo, ret) \
54 do { \
55 DEFINE_WAIT(__wait); \
56 long __timeo = timeo; \
57 ret = 0; \
58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
59 while (!(condition)) { \
60 if (!__timeo) { \
61 ret = -EAGAIN; \
62 break; \
63 } \
64 if (signal_pending(current)) { \
65 ret = sock_intr_errno(__timeo); \
66 break; \
67 } \
68 release_sock(sk); \
69 __timeo = schedule_timeout(__timeo); \
70 lock_sock(sk); \
71 ret = sock_error(sk); \
72 if (ret) \
73 break; \
74 } \
75 finish_wait(sk_sleep(sk), &__wait); \
76 } while (0)
77
78 #define iucv_sock_wait(sk, condition, timeo) \
79 ({ \
80 int __ret = 0; \
81 if (!(condition)) \
82 __iucv_sock_wait(sk, condition, timeo, __ret); \
83 __ret; \
84 })
85
86 static void iucv_sock_kill(struct sock *sk);
87 static void iucv_sock_close(struct sock *sk);
88 static void iucv_sever_path(struct sock *, int);
89
90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
91 struct packet_type *pt, struct net_device *orig_dev);
92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
93 struct sk_buff *skb, u8 flags);
94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
95
96 /* Call Back functions */
97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
99 static void iucv_callback_connack(struct iucv_path *, u8 *);
100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
103
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
107 };
108
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
116 };
117
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120 memcpy(dst, src, 8);
121 }
122
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(&dst[8], src, 8);
126 }
127
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133 return 0;
134 }
135
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142
143 /**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151 struct iucv_sock *iucv;
152 struct sock *sk;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 switch (sk->sk_state) {
162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
165 iucv_sever_path(sk, 0);
166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179 }
180
181 /**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189 struct sock *sk;
190
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213 }
214
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221 };
222
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
226 .bus = NULL,
227 .pm = &afiucv_pm_ops,
228 };
229
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232
233 /**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
245 * The socket data length is computed by subtracting the socket data length
246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262 }
263
264 /**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274 return (sk->sk_state == state || sk->sk_state == state2);
275 }
276
277 /**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
296 }
297
298 /**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
307 if (skwq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310 rcu_read_unlock();
311 }
312
313 /**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318 {
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
341 if (confirm_recv)
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 }
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 if (imsg)
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354
355 skb->dev = iucv->hs_dev;
356 if (!skb->dev)
357 return -ENODEV;
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
359 return -ENETDOWN;
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
362 return -EMSGSIZE;
363 else
364 skb_trim(skb, skb->dev->mtu);
365 }
366 skb->protocol = ETH_P_AF_IUCV;
367 nskb = skb_clone(skb, GFP_ATOMIC);
368 if (!nskb)
369 return -ENOMEM;
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
372 if (net_xmit_eval(err)) {
373 skb_unlink(nskb, &iucv->send_skb_q);
374 kfree_skb(nskb);
375 } else {
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 }
379 return net_xmit_eval(err);
380 }
381
382 static struct sock *__iucv_get_sock_by_name(char *nm)
383 {
384 struct sock *sk;
385
386 sk_for_each(sk, &iucv_sk_list.head)
387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
388 return sk;
389
390 return NULL;
391 }
392
393 static void iucv_sock_destruct(struct sock *sk)
394 {
395 skb_queue_purge(&sk->sk_receive_queue);
396 skb_queue_purge(&sk->sk_error_queue);
397
398 sk_mem_reclaim(sk);
399
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
402 return;
403 }
404
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
409 }
410
411 /* Cleanup Listen */
412 static void iucv_sock_cleanup_listen(struct sock *parent)
413 {
414 struct sock *sk;
415
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
418 iucv_sock_close(sk);
419 iucv_sock_kill(sk);
420 }
421
422 parent->sk_state = IUCV_CLOSED;
423 }
424
425 /* Kill socket (only if zapped and orphaned) */
426 static void iucv_sock_kill(struct sock *sk)
427 {
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
429 return;
430
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
433 sock_put(sk);
434 }
435
436 /* Terminate an IUCV path */
437 static void iucv_sever_path(struct sock *sk, int with_user_data)
438 {
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
442
443 if (iucv->path) {
444 iucv->path = NULL;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
450 } else
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
453 }
454 }
455
456 /* Send FIN through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
458 {
459 int err = 0;
460 int blen;
461 struct sk_buff *skb;
462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 skb = sock_alloc_send_skb(sk, blen, 1, &err);
465 if (skb) {
466 skb_reserve(skb, blen);
467 err = afiucv_hs_send(NULL, sk, skb, flags);
468 }
469 return err;
470 }
471
472 /* Close an IUCV socket */
473 static void iucv_sock_close(struct sock *sk)
474 {
475 struct iucv_sock *iucv = iucv_sk(sk);
476 unsigned long timeo;
477 int err = 0;
478
479 lock_sock(sk);
480
481 switch (sk->sk_state) {
482 case IUCV_LISTEN:
483 iucv_sock_cleanup_listen(sk);
484 break;
485
486 case IUCV_CONNECTED:
487 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
489 sk->sk_state = IUCV_DISCONN;
490 sk->sk_state_change(sk);
491 }
492 case IUCV_DISCONN: /* fall through */
493 sk->sk_state = IUCV_CLOSING;
494 sk->sk_state_change(sk);
495
496 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
498 timeo = sk->sk_lingertime;
499 else
500 timeo = IUCV_DISCONN_TIMEOUT;
501 iucv_sock_wait(sk,
502 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
503 timeo);
504 }
505
506 case IUCV_CLOSING: /* fall through */
507 sk->sk_state = IUCV_CLOSED;
508 sk->sk_state_change(sk);
509
510 sk->sk_err = ECONNRESET;
511 sk->sk_state_change(sk);
512
513 skb_queue_purge(&iucv->send_skb_q);
514 skb_queue_purge(&iucv->backlog_skb_q);
515
516 default: /* fall through */
517 iucv_sever_path(sk, 1);
518 }
519
520 if (iucv->hs_dev) {
521 dev_put(iucv->hs_dev);
522 iucv->hs_dev = NULL;
523 sk->sk_bound_dev_if = 0;
524 }
525
526 /* mark socket for deletion by iucv_sock_kill() */
527 sock_set_flag(sk, SOCK_ZAPPED);
528
529 release_sock(sk);
530 }
531
532 static void iucv_sock_init(struct sock *sk, struct sock *parent)
533 {
534 if (parent) {
535 sk->sk_type = parent->sk_type;
536 security_sk_clone(parent, sk);
537 }
538 }
539
540 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
541 {
542 struct sock *sk;
543 struct iucv_sock *iucv;
544
545 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
546 if (!sk)
547 return NULL;
548 iucv = iucv_sk(sk);
549
550 sock_init_data(sock, sk);
551 INIT_LIST_HEAD(&iucv->accept_q);
552 spin_lock_init(&iucv->accept_q_lock);
553 skb_queue_head_init(&iucv->send_skb_q);
554 INIT_LIST_HEAD(&iucv->message_q.list);
555 spin_lock_init(&iucv->message_q.lock);
556 skb_queue_head_init(&iucv->backlog_skb_q);
557 iucv->send_tag = 0;
558 atomic_set(&iucv->pendings, 0);
559 iucv->flags = 0;
560 iucv->msglimit = 0;
561 atomic_set(&iucv->msg_sent, 0);
562 atomic_set(&iucv->msg_recv, 0);
563 iucv->path = NULL;
564 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
565 memset(&iucv->src_user_id , 0, 32);
566 if (pr_iucv)
567 iucv->transport = AF_IUCV_TRANS_IUCV;
568 else
569 iucv->transport = AF_IUCV_TRANS_HIPER;
570
571 sk->sk_destruct = iucv_sock_destruct;
572 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
573 sk->sk_allocation = GFP_DMA;
574
575 sock_reset_flag(sk, SOCK_ZAPPED);
576
577 sk->sk_protocol = proto;
578 sk->sk_state = IUCV_OPEN;
579
580 iucv_sock_link(&iucv_sk_list, sk);
581 return sk;
582 }
583
584 /* Create an IUCV socket */
585 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
586 int kern)
587 {
588 struct sock *sk;
589
590 if (protocol && protocol != PF_IUCV)
591 return -EPROTONOSUPPORT;
592
593 sock->state = SS_UNCONNECTED;
594
595 switch (sock->type) {
596 case SOCK_STREAM:
597 sock->ops = &iucv_sock_ops;
598 break;
599 case SOCK_SEQPACKET:
600 /* currently, proto ops can handle both sk types */
601 sock->ops = &iucv_sock_ops;
602 break;
603 default:
604 return -ESOCKTNOSUPPORT;
605 }
606
607 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
608 if (!sk)
609 return -ENOMEM;
610
611 iucv_sock_init(sk, NULL);
612
613 return 0;
614 }
615
616 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
617 {
618 write_lock_bh(&l->lock);
619 sk_add_node(sk, &l->head);
620 write_unlock_bh(&l->lock);
621 }
622
623 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
624 {
625 write_lock_bh(&l->lock);
626 sk_del_node_init(sk);
627 write_unlock_bh(&l->lock);
628 }
629
630 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
631 {
632 unsigned long flags;
633 struct iucv_sock *par = iucv_sk(parent);
634
635 sock_hold(sk);
636 spin_lock_irqsave(&par->accept_q_lock, flags);
637 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
638 spin_unlock_irqrestore(&par->accept_q_lock, flags);
639 iucv_sk(sk)->parent = parent;
640 sk_acceptq_added(parent);
641 }
642
643 void iucv_accept_unlink(struct sock *sk)
644 {
645 unsigned long flags;
646 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
647
648 spin_lock_irqsave(&par->accept_q_lock, flags);
649 list_del_init(&iucv_sk(sk)->accept_q);
650 spin_unlock_irqrestore(&par->accept_q_lock, flags);
651 sk_acceptq_removed(iucv_sk(sk)->parent);
652 iucv_sk(sk)->parent = NULL;
653 sock_put(sk);
654 }
655
656 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
657 {
658 struct iucv_sock *isk, *n;
659 struct sock *sk;
660
661 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
662 sk = (struct sock *) isk;
663 lock_sock(sk);
664
665 if (sk->sk_state == IUCV_CLOSED) {
666 iucv_accept_unlink(sk);
667 release_sock(sk);
668 continue;
669 }
670
671 if (sk->sk_state == IUCV_CONNECTED ||
672 sk->sk_state == IUCV_DISCONN ||
673 !newsock) {
674 iucv_accept_unlink(sk);
675 if (newsock)
676 sock_graft(sk, newsock);
677
678 release_sock(sk);
679 return sk;
680 }
681
682 release_sock(sk);
683 }
684 return NULL;
685 }
686
687 static void __iucv_auto_name(struct iucv_sock *iucv)
688 {
689 char name[12];
690
691 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
692 while (__iucv_get_sock_by_name(name)) {
693 sprintf(name, "%08x",
694 atomic_inc_return(&iucv_sk_list.autobind_name));
695 }
696 memcpy(iucv->src_name, name, 8);
697 }
698
699 /* Bind an unbound socket */
700 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
701 int addr_len)
702 {
703 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
704 struct sock *sk = sock->sk;
705 struct iucv_sock *iucv;
706 int err = 0;
707 struct net_device *dev;
708 char uid[9];
709
710 /* Verify the input sockaddr */
711 if (!addr || addr->sa_family != AF_IUCV)
712 return -EINVAL;
713
714 if (addr_len < sizeof(struct sockaddr_iucv))
715 return -EINVAL;
716
717 lock_sock(sk);
718 if (sk->sk_state != IUCV_OPEN) {
719 err = -EBADFD;
720 goto done;
721 }
722
723 write_lock_bh(&iucv_sk_list.lock);
724
725 iucv = iucv_sk(sk);
726 if (__iucv_get_sock_by_name(sa->siucv_name)) {
727 err = -EADDRINUSE;
728 goto done_unlock;
729 }
730 if (iucv->path)
731 goto done_unlock;
732
733 /* Bind the socket */
734 if (pr_iucv)
735 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
736 goto vm_bind; /* VM IUCV transport */
737
738 /* try hiper transport */
739 memcpy(uid, sa->siucv_user_id, sizeof(uid));
740 ASCEBC(uid, 8);
741 rcu_read_lock();
742 for_each_netdev_rcu(&init_net, dev) {
743 if (!memcmp(dev->perm_addr, uid, 8)) {
744 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
745 /* Check for unitialized siucv_name */
746 if (strncmp(sa->siucv_name, " ", 8) == 0)
747 __iucv_auto_name(iucv);
748 else
749 memcpy(iucv->src_name, sa->siucv_name, 8);
750 sk->sk_bound_dev_if = dev->ifindex;
751 iucv->hs_dev = dev;
752 dev_hold(dev);
753 sk->sk_state = IUCV_BOUND;
754 iucv->transport = AF_IUCV_TRANS_HIPER;
755 if (!iucv->msglimit)
756 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
757 rcu_read_unlock();
758 goto done_unlock;
759 }
760 }
761 rcu_read_unlock();
762 vm_bind:
763 if (pr_iucv) {
764 /* use local userid for backward compat */
765 memcpy(iucv->src_name, sa->siucv_name, 8);
766 memcpy(iucv->src_user_id, iucv_userid, 8);
767 sk->sk_state = IUCV_BOUND;
768 iucv->transport = AF_IUCV_TRANS_IUCV;
769 if (!iucv->msglimit)
770 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
771 goto done_unlock;
772 }
773 /* found no dev to bind */
774 err = -ENODEV;
775 done_unlock:
776 /* Release the socket list lock */
777 write_unlock_bh(&iucv_sk_list.lock);
778 done:
779 release_sock(sk);
780 return err;
781 }
782
783 /* Automatically bind an unbound socket */
784 static int iucv_sock_autobind(struct sock *sk)
785 {
786 struct iucv_sock *iucv = iucv_sk(sk);
787 int err = 0;
788
789 if (unlikely(!pr_iucv))
790 return -EPROTO;
791
792 memcpy(iucv->src_user_id, iucv_userid, 8);
793
794 write_lock_bh(&iucv_sk_list.lock);
795 __iucv_auto_name(iucv);
796 write_unlock_bh(&iucv_sk_list.lock);
797
798 if (!iucv->msglimit)
799 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
800
801 return err;
802 }
803
804 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
805 {
806 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
807 struct sock *sk = sock->sk;
808 struct iucv_sock *iucv = iucv_sk(sk);
809 unsigned char user_data[16];
810 int err;
811
812 high_nmcpy(user_data, sa->siucv_name);
813 low_nmcpy(user_data, iucv->src_name);
814 ASCEBC(user_data, sizeof(user_data));
815
816 /* Create path. */
817 iucv->path = iucv_path_alloc(iucv->msglimit,
818 IUCV_IPRMDATA, GFP_KERNEL);
819 if (!iucv->path) {
820 err = -ENOMEM;
821 goto done;
822 }
823 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
824 sa->siucv_user_id, NULL, user_data,
825 sk);
826 if (err) {
827 iucv_path_free(iucv->path);
828 iucv->path = NULL;
829 switch (err) {
830 case 0x0b: /* Target communicator is not logged on */
831 err = -ENETUNREACH;
832 break;
833 case 0x0d: /* Max connections for this guest exceeded */
834 case 0x0e: /* Max connections for target guest exceeded */
835 err = -EAGAIN;
836 break;
837 case 0x0f: /* Missing IUCV authorization */
838 err = -EACCES;
839 break;
840 default:
841 err = -ECONNREFUSED;
842 break;
843 }
844 }
845 done:
846 return err;
847 }
848
849 /* Connect an unconnected socket */
850 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
851 int alen, int flags)
852 {
853 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
854 struct sock *sk = sock->sk;
855 struct iucv_sock *iucv = iucv_sk(sk);
856 int err;
857
858 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
859 return -EINVAL;
860
861 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
862 return -EBADFD;
863
864 if (sk->sk_state == IUCV_OPEN &&
865 iucv->transport == AF_IUCV_TRANS_HIPER)
866 return -EBADFD; /* explicit bind required */
867
868 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
869 return -EINVAL;
870
871 if (sk->sk_state == IUCV_OPEN) {
872 err = iucv_sock_autobind(sk);
873 if (unlikely(err))
874 return err;
875 }
876
877 lock_sock(sk);
878
879 /* Set the destination information */
880 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
881 memcpy(iucv->dst_name, sa->siucv_name, 8);
882
883 if (iucv->transport == AF_IUCV_TRANS_HIPER)
884 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
885 else
886 err = afiucv_path_connect(sock, addr);
887 if (err)
888 goto done;
889
890 if (sk->sk_state != IUCV_CONNECTED)
891 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
892 IUCV_DISCONN),
893 sock_sndtimeo(sk, flags & O_NONBLOCK));
894
895 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
896 err = -ECONNREFUSED;
897
898 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
899 iucv_sever_path(sk, 0);
900
901 done:
902 release_sock(sk);
903 return err;
904 }
905
906 /* Move a socket into listening state. */
907 static int iucv_sock_listen(struct socket *sock, int backlog)
908 {
909 struct sock *sk = sock->sk;
910 int err;
911
912 lock_sock(sk);
913
914 err = -EINVAL;
915 if (sk->sk_state != IUCV_BOUND)
916 goto done;
917
918 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
919 goto done;
920
921 sk->sk_max_ack_backlog = backlog;
922 sk->sk_ack_backlog = 0;
923 sk->sk_state = IUCV_LISTEN;
924 err = 0;
925
926 done:
927 release_sock(sk);
928 return err;
929 }
930
931 /* Accept a pending connection */
932 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
933 int flags)
934 {
935 DECLARE_WAITQUEUE(wait, current);
936 struct sock *sk = sock->sk, *nsk;
937 long timeo;
938 int err = 0;
939
940 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
941
942 if (sk->sk_state != IUCV_LISTEN) {
943 err = -EBADFD;
944 goto done;
945 }
946
947 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
948
949 /* Wait for an incoming connection */
950 add_wait_queue_exclusive(sk_sleep(sk), &wait);
951 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
952 set_current_state(TASK_INTERRUPTIBLE);
953 if (!timeo) {
954 err = -EAGAIN;
955 break;
956 }
957
958 release_sock(sk);
959 timeo = schedule_timeout(timeo);
960 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
961
962 if (sk->sk_state != IUCV_LISTEN) {
963 err = -EBADFD;
964 break;
965 }
966
967 if (signal_pending(current)) {
968 err = sock_intr_errno(timeo);
969 break;
970 }
971 }
972
973 set_current_state(TASK_RUNNING);
974 remove_wait_queue(sk_sleep(sk), &wait);
975
976 if (err)
977 goto done;
978
979 newsock->state = SS_CONNECTED;
980
981 done:
982 release_sock(sk);
983 return err;
984 }
985
986 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
987 int *len, int peer)
988 {
989 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
990 struct sock *sk = sock->sk;
991 struct iucv_sock *iucv = iucv_sk(sk);
992
993 addr->sa_family = AF_IUCV;
994 *len = sizeof(struct sockaddr_iucv);
995
996 if (peer) {
997 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
998 memcpy(siucv->siucv_name, iucv->dst_name, 8);
999 } else {
1000 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1001 memcpy(siucv->siucv_name, iucv->src_name, 8);
1002 }
1003 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1004 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1005 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1006
1007 return 0;
1008 }
1009
1010 /**
1011 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1012 * @path: IUCV path
1013 * @msg: Pointer to a struct iucv_message
1014 * @skb: The socket data to send, skb->len MUST BE <= 7
1015 *
1016 * Send the socket data in the parameter list in the iucv message
1017 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1018 * list and the socket data len at index 7 (last byte).
1019 * See also iucv_msg_length().
1020 *
1021 * Returns the error code from the iucv_message_send() call.
1022 */
1023 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1024 struct sk_buff *skb)
1025 {
1026 u8 prmdata[8];
1027
1028 memcpy(prmdata, (void *) skb->data, skb->len);
1029 prmdata[7] = 0xff - (u8) skb->len;
1030 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1031 (void *) prmdata, 8);
1032 }
1033
1034 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1035 size_t len)
1036 {
1037 struct sock *sk = sock->sk;
1038 struct iucv_sock *iucv = iucv_sk(sk);
1039 size_t headroom, linear;
1040 struct sk_buff *skb;
1041 struct iucv_message txmsg = {0};
1042 struct cmsghdr *cmsg;
1043 int cmsg_done;
1044 long timeo;
1045 char user_id[9];
1046 char appl_id[9];
1047 int err;
1048 int noblock = msg->msg_flags & MSG_DONTWAIT;
1049
1050 err = sock_error(sk);
1051 if (err)
1052 return err;
1053
1054 if (msg->msg_flags & MSG_OOB)
1055 return -EOPNOTSUPP;
1056
1057 /* SOCK_SEQPACKET: we do not support segmented records */
1058 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1059 return -EOPNOTSUPP;
1060
1061 lock_sock(sk);
1062
1063 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1064 err = -EPIPE;
1065 goto out;
1066 }
1067
1068 /* Return if the socket is not in connected state */
1069 if (sk->sk_state != IUCV_CONNECTED) {
1070 err = -ENOTCONN;
1071 goto out;
1072 }
1073
1074 /* initialize defaults */
1075 cmsg_done = 0; /* check for duplicate headers */
1076 txmsg.class = 0;
1077
1078 /* iterate over control messages */
1079 for_each_cmsghdr(cmsg, msg) {
1080 if (!CMSG_OK(msg, cmsg)) {
1081 err = -EINVAL;
1082 goto out;
1083 }
1084
1085 if (cmsg->cmsg_level != SOL_IUCV)
1086 continue;
1087
1088 if (cmsg->cmsg_type & cmsg_done) {
1089 err = -EINVAL;
1090 goto out;
1091 }
1092 cmsg_done |= cmsg->cmsg_type;
1093
1094 switch (cmsg->cmsg_type) {
1095 case SCM_IUCV_TRGCLS:
1096 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1097 err = -EINVAL;
1098 goto out;
1099 }
1100
1101 /* set iucv message target class */
1102 memcpy(&txmsg.class,
1103 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1104
1105 break;
1106
1107 default:
1108 err = -EINVAL;
1109 goto out;
1110 }
1111 }
1112
1113 /* allocate one skb for each iucv message:
1114 * this is fine for SOCK_SEQPACKET (unless we want to support
1115 * segmented records using the MSG_EOR flag), but
1116 * for SOCK_STREAM we might want to improve it in future */
1117 headroom = (iucv->transport == AF_IUCV_TRANS_HIPER)
1118 ? sizeof(struct af_iucv_trans_hdr) + ETH_HLEN : 0;
1119 if (headroom + len < PAGE_SIZE) {
1120 linear = len;
1121 } else {
1122 /* In nonlinear "classic" iucv skb,
1123 * reserve space for iucv_array
1124 */
1125 if (iucv->transport != AF_IUCV_TRANS_HIPER)
1126 headroom += sizeof(struct iucv_array) *
1127 (MAX_SKB_FRAGS + 1);
1128 linear = PAGE_SIZE - headroom;
1129 }
1130 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1131 noblock, &err, 0);
1132 if (!skb)
1133 goto out;
1134 if (headroom)
1135 skb_reserve(skb, headroom);
1136 skb_put(skb, linear);
1137 skb->len = len;
1138 skb->data_len = len - linear;
1139 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1140 if (err)
1141 goto fail;
1142
1143 /* wait if outstanding messages for iucv path has reached */
1144 timeo = sock_sndtimeo(sk, noblock);
1145 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1146 if (err)
1147 goto fail;
1148
1149 /* return -ECONNRESET if the socket is no longer connected */
1150 if (sk->sk_state != IUCV_CONNECTED) {
1151 err = -ECONNRESET;
1152 goto fail;
1153 }
1154
1155 /* increment and save iucv message tag for msg_completion cbk */
1156 txmsg.tag = iucv->send_tag++;
1157 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1158
1159 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1160 atomic_inc(&iucv->msg_sent);
1161 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1162 if (err) {
1163 atomic_dec(&iucv->msg_sent);
1164 goto fail;
1165 }
1166 } else { /* Classic VM IUCV transport */
1167 skb_queue_tail(&iucv->send_skb_q, skb);
1168
1169 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1170 skb->len <= 7) {
1171 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1172
1173 /* on success: there is no message_complete callback */
1174 /* for an IPRMDATA msg; remove skb from send queue */
1175 if (err == 0) {
1176 skb_unlink(skb, &iucv->send_skb_q);
1177 kfree_skb(skb);
1178 }
1179
1180 /* this error should never happen since the */
1181 /* IUCV_IPRMDATA path flag is set... sever path */
1182 if (err == 0x15) {
1183 pr_iucv->path_sever(iucv->path, NULL);
1184 skb_unlink(skb, &iucv->send_skb_q);
1185 err = -EPIPE;
1186 goto fail;
1187 }
1188 } else if (skb_is_nonlinear(skb)) {
1189 struct iucv_array *iba = (struct iucv_array *)skb->head;
1190 int i;
1191
1192 /* skip iucv_array lying in the headroom */
1193 iba[0].address = (u32)(addr_t)skb->data;
1194 iba[0].length = (u32)skb_headlen(skb);
1195 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1196 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1197
1198 iba[i + 1].address =
1199 (u32)(addr_t)skb_frag_address(frag);
1200 iba[i + 1].length = (u32)skb_frag_size(frag);
1201 }
1202 err = pr_iucv->message_send(iucv->path, &txmsg,
1203 IUCV_IPBUFLST, 0,
1204 (void *)iba, skb->len);
1205 } else { /* non-IPRM Linear skb */
1206 err = pr_iucv->message_send(iucv->path, &txmsg,
1207 0, 0, (void *)skb->data, skb->len);
1208 }
1209 if (err) {
1210 if (err == 3) {
1211 user_id[8] = 0;
1212 memcpy(user_id, iucv->dst_user_id, 8);
1213 appl_id[8] = 0;
1214 memcpy(appl_id, iucv->dst_name, 8);
1215 pr_err(
1216 "Application %s on z/VM guest %s exceeds message limit\n",
1217 appl_id, user_id);
1218 err = -EAGAIN;
1219 } else {
1220 err = -EPIPE;
1221 }
1222 skb_unlink(skb, &iucv->send_skb_q);
1223 goto fail;
1224 }
1225 }
1226
1227 release_sock(sk);
1228 return len;
1229
1230 fail:
1231 kfree_skb(skb);
1232 out:
1233 release_sock(sk);
1234 return err;
1235 }
1236
1237 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1238 {
1239 size_t headroom, linear;
1240 struct sk_buff *skb;
1241 int err;
1242
1243 if (len < PAGE_SIZE) {
1244 headroom = 0;
1245 linear = len;
1246 } else {
1247 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1248 linear = PAGE_SIZE - headroom;
1249 }
1250 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1251 0, &err, GFP_ATOMIC | GFP_DMA);
1252 WARN_ONCE(!skb,
1253 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1254 len, err);
1255 if (skb) {
1256 if (headroom)
1257 skb_reserve(skb, headroom);
1258 skb_put(skb, linear);
1259 skb->len = len;
1260 skb->data_len = len - linear;
1261 }
1262 return skb;
1263 }
1264
1265 /* iucv_process_message() - Receive a single outstanding IUCV message
1266 *
1267 * Locking: must be called with message_q.lock held
1268 */
1269 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1270 struct iucv_path *path,
1271 struct iucv_message *msg)
1272 {
1273 int rc;
1274 unsigned int len;
1275
1276 len = iucv_msg_length(msg);
1277
1278 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1279 /* Note: the first 4 bytes are reserved for msg tag */
1280 IUCV_SKB_CB(skb)->class = msg->class;
1281
1282 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1283 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1284 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1285 skb->data = NULL;
1286 skb->len = 0;
1287 }
1288 } else {
1289 if (skb_is_nonlinear(skb)) {
1290 struct iucv_array *iba = (struct iucv_array *)skb->head;
1291 int i;
1292
1293 iba[0].address = (u32)(addr_t)skb->data;
1294 iba[0].length = (u32)skb_headlen(skb);
1295 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1296 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1297
1298 iba[i + 1].address =
1299 (u32)(addr_t)skb_frag_address(frag);
1300 iba[i + 1].length = (u32)skb_frag_size(frag);
1301 }
1302 rc = pr_iucv->message_receive(path, msg,
1303 IUCV_IPBUFLST,
1304 (void *)iba, len, NULL);
1305 } else {
1306 rc = pr_iucv->message_receive(path, msg,
1307 msg->flags & IUCV_IPRMDATA,
1308 skb->data, len, NULL);
1309 }
1310 if (rc) {
1311 kfree_skb(skb);
1312 return;
1313 }
1314 WARN_ON_ONCE(skb->len != len);
1315 }
1316
1317 IUCV_SKB_CB(skb)->offset = 0;
1318 if (sock_queue_rcv_skb(sk, skb))
1319 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1320 }
1321
1322 /* iucv_process_message_q() - Process outstanding IUCV messages
1323 *
1324 * Locking: must be called with message_q.lock held
1325 */
1326 static void iucv_process_message_q(struct sock *sk)
1327 {
1328 struct iucv_sock *iucv = iucv_sk(sk);
1329 struct sk_buff *skb;
1330 struct sock_msg_q *p, *n;
1331
1332 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1333 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1334 if (!skb)
1335 break;
1336 iucv_process_message(sk, skb, p->path, &p->msg);
1337 list_del(&p->list);
1338 kfree(p);
1339 if (!skb_queue_empty(&iucv->backlog_skb_q))
1340 break;
1341 }
1342 }
1343
1344 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1345 size_t len, int flags)
1346 {
1347 int noblock = flags & MSG_DONTWAIT;
1348 struct sock *sk = sock->sk;
1349 struct iucv_sock *iucv = iucv_sk(sk);
1350 unsigned int copied, rlen;
1351 struct sk_buff *skb, *rskb, *cskb;
1352 int err = 0;
1353 u32 offset;
1354
1355 if ((sk->sk_state == IUCV_DISCONN) &&
1356 skb_queue_empty(&iucv->backlog_skb_q) &&
1357 skb_queue_empty(&sk->sk_receive_queue) &&
1358 list_empty(&iucv->message_q.list))
1359 return 0;
1360
1361 if (flags & (MSG_OOB))
1362 return -EOPNOTSUPP;
1363
1364 /* receive/dequeue next skb:
1365 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1366 skb = skb_recv_datagram(sk, flags, noblock, &err);
1367 if (!skb) {
1368 if (sk->sk_shutdown & RCV_SHUTDOWN)
1369 return 0;
1370 return err;
1371 }
1372
1373 offset = IUCV_SKB_CB(skb)->offset;
1374 rlen = skb->len - offset; /* real length of skb */
1375 copied = min_t(unsigned int, rlen, len);
1376 if (!rlen)
1377 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1378
1379 cskb = skb;
1380 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1381 if (!(flags & MSG_PEEK))
1382 skb_queue_head(&sk->sk_receive_queue, skb);
1383 return -EFAULT;
1384 }
1385
1386 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1387 if (sk->sk_type == SOCK_SEQPACKET) {
1388 if (copied < rlen)
1389 msg->msg_flags |= MSG_TRUNC;
1390 /* each iucv message contains a complete record */
1391 msg->msg_flags |= MSG_EOR;
1392 }
1393
1394 /* create control message to store iucv msg target class:
1395 * get the trgcls from the control buffer of the skb due to
1396 * fragmentation of original iucv message. */
1397 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1398 sizeof(IUCV_SKB_CB(skb)->class),
1399 (void *)&IUCV_SKB_CB(skb)->class);
1400 if (err) {
1401 if (!(flags & MSG_PEEK))
1402 skb_queue_head(&sk->sk_receive_queue, skb);
1403 return err;
1404 }
1405
1406 /* Mark read part of skb as used */
1407 if (!(flags & MSG_PEEK)) {
1408
1409 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1410 if (sk->sk_type == SOCK_STREAM) {
1411 if (copied < rlen) {
1412 IUCV_SKB_CB(skb)->offset = offset + copied;
1413 skb_queue_head(&sk->sk_receive_queue, skb);
1414 goto done;
1415 }
1416 }
1417
1418 kfree_skb(skb);
1419 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1420 atomic_inc(&iucv->msg_recv);
1421 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1422 WARN_ON(1);
1423 iucv_sock_close(sk);
1424 return -EFAULT;
1425 }
1426 }
1427
1428 /* Queue backlog skbs */
1429 spin_lock_bh(&iucv->message_q.lock);
1430 rskb = skb_dequeue(&iucv->backlog_skb_q);
1431 while (rskb) {
1432 IUCV_SKB_CB(rskb)->offset = 0;
1433 if (sock_queue_rcv_skb(sk, rskb)) {
1434 skb_queue_head(&iucv->backlog_skb_q,
1435 rskb);
1436 break;
1437 } else {
1438 rskb = skb_dequeue(&iucv->backlog_skb_q);
1439 }
1440 }
1441 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1442 if (!list_empty(&iucv->message_q.list))
1443 iucv_process_message_q(sk);
1444 if (atomic_read(&iucv->msg_recv) >=
1445 iucv->msglimit / 2) {
1446 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1447 if (err) {
1448 sk->sk_state = IUCV_DISCONN;
1449 sk->sk_state_change(sk);
1450 }
1451 }
1452 }
1453 spin_unlock_bh(&iucv->message_q.lock);
1454 }
1455
1456 done:
1457 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1458 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1459 copied = rlen;
1460
1461 return copied;
1462 }
1463
1464 static inline unsigned int iucv_accept_poll(struct sock *parent)
1465 {
1466 struct iucv_sock *isk, *n;
1467 struct sock *sk;
1468
1469 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1470 sk = (struct sock *) isk;
1471
1472 if (sk->sk_state == IUCV_CONNECTED)
1473 return POLLIN | POLLRDNORM;
1474 }
1475
1476 return 0;
1477 }
1478
1479 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1480 poll_table *wait)
1481 {
1482 struct sock *sk = sock->sk;
1483 unsigned int mask = 0;
1484
1485 sock_poll_wait(file, sk_sleep(sk), wait);
1486
1487 if (sk->sk_state == IUCV_LISTEN)
1488 return iucv_accept_poll(sk);
1489
1490 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1491 mask |= POLLERR |
1492 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1493
1494 if (sk->sk_shutdown & RCV_SHUTDOWN)
1495 mask |= POLLRDHUP;
1496
1497 if (sk->sk_shutdown == SHUTDOWN_MASK)
1498 mask |= POLLHUP;
1499
1500 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1501 (sk->sk_shutdown & RCV_SHUTDOWN))
1502 mask |= POLLIN | POLLRDNORM;
1503
1504 if (sk->sk_state == IUCV_CLOSED)
1505 mask |= POLLHUP;
1506
1507 if (sk->sk_state == IUCV_DISCONN)
1508 mask |= POLLIN;
1509
1510 if (sock_writeable(sk) && iucv_below_msglim(sk))
1511 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1512 else
1513 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1514
1515 return mask;
1516 }
1517
1518 static int iucv_sock_shutdown(struct socket *sock, int how)
1519 {
1520 struct sock *sk = sock->sk;
1521 struct iucv_sock *iucv = iucv_sk(sk);
1522 struct iucv_message txmsg;
1523 int err = 0;
1524
1525 how++;
1526
1527 if ((how & ~SHUTDOWN_MASK) || !how)
1528 return -EINVAL;
1529
1530 lock_sock(sk);
1531 switch (sk->sk_state) {
1532 case IUCV_LISTEN:
1533 case IUCV_DISCONN:
1534 case IUCV_CLOSING:
1535 case IUCV_CLOSED:
1536 err = -ENOTCONN;
1537 goto fail;
1538 default:
1539 break;
1540 }
1541
1542 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1543 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1544 txmsg.class = 0;
1545 txmsg.tag = 0;
1546 err = pr_iucv->message_send(iucv->path, &txmsg,
1547 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1548 if (err) {
1549 switch (err) {
1550 case 1:
1551 err = -ENOTCONN;
1552 break;
1553 case 2:
1554 err = -ECONNRESET;
1555 break;
1556 default:
1557 err = -ENOTCONN;
1558 break;
1559 }
1560 }
1561 } else
1562 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1563 }
1564
1565 sk->sk_shutdown |= how;
1566 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1567 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1568 iucv->path) {
1569 err = pr_iucv->path_quiesce(iucv->path, NULL);
1570 if (err)
1571 err = -ENOTCONN;
1572 /* skb_queue_purge(&sk->sk_receive_queue); */
1573 }
1574 skb_queue_purge(&sk->sk_receive_queue);
1575 }
1576
1577 /* Wake up anyone sleeping in poll */
1578 sk->sk_state_change(sk);
1579
1580 fail:
1581 release_sock(sk);
1582 return err;
1583 }
1584
1585 static int iucv_sock_release(struct socket *sock)
1586 {
1587 struct sock *sk = sock->sk;
1588 int err = 0;
1589
1590 if (!sk)
1591 return 0;
1592
1593 iucv_sock_close(sk);
1594
1595 sock_orphan(sk);
1596 iucv_sock_kill(sk);
1597 return err;
1598 }
1599
1600 /* getsockopt and setsockopt */
1601 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1602 char __user *optval, unsigned int optlen)
1603 {
1604 struct sock *sk = sock->sk;
1605 struct iucv_sock *iucv = iucv_sk(sk);
1606 int val;
1607 int rc;
1608
1609 if (level != SOL_IUCV)
1610 return -ENOPROTOOPT;
1611
1612 if (optlen < sizeof(int))
1613 return -EINVAL;
1614
1615 if (get_user(val, (int __user *) optval))
1616 return -EFAULT;
1617
1618 rc = 0;
1619
1620 lock_sock(sk);
1621 switch (optname) {
1622 case SO_IPRMDATA_MSG:
1623 if (val)
1624 iucv->flags |= IUCV_IPRMDATA;
1625 else
1626 iucv->flags &= ~IUCV_IPRMDATA;
1627 break;
1628 case SO_MSGLIMIT:
1629 switch (sk->sk_state) {
1630 case IUCV_OPEN:
1631 case IUCV_BOUND:
1632 if (val < 1 || val > (u16)(~0))
1633 rc = -EINVAL;
1634 else
1635 iucv->msglimit = val;
1636 break;
1637 default:
1638 rc = -EINVAL;
1639 break;
1640 }
1641 break;
1642 default:
1643 rc = -ENOPROTOOPT;
1644 break;
1645 }
1646 release_sock(sk);
1647
1648 return rc;
1649 }
1650
1651 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1652 char __user *optval, int __user *optlen)
1653 {
1654 struct sock *sk = sock->sk;
1655 struct iucv_sock *iucv = iucv_sk(sk);
1656 unsigned int val;
1657 int len;
1658
1659 if (level != SOL_IUCV)
1660 return -ENOPROTOOPT;
1661
1662 if (get_user(len, optlen))
1663 return -EFAULT;
1664
1665 if (len < 0)
1666 return -EINVAL;
1667
1668 len = min_t(unsigned int, len, sizeof(int));
1669
1670 switch (optname) {
1671 case SO_IPRMDATA_MSG:
1672 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1673 break;
1674 case SO_MSGLIMIT:
1675 lock_sock(sk);
1676 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1677 : iucv->msglimit; /* default */
1678 release_sock(sk);
1679 break;
1680 case SO_MSGSIZE:
1681 if (sk->sk_state == IUCV_OPEN)
1682 return -EBADFD;
1683 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1684 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1685 0x7fffffff;
1686 break;
1687 default:
1688 return -ENOPROTOOPT;
1689 }
1690
1691 if (put_user(len, optlen))
1692 return -EFAULT;
1693 if (copy_to_user(optval, &val, len))
1694 return -EFAULT;
1695
1696 return 0;
1697 }
1698
1699
1700 /* Callback wrappers - called from iucv base support */
1701 static int iucv_callback_connreq(struct iucv_path *path,
1702 u8 ipvmid[8], u8 ipuser[16])
1703 {
1704 unsigned char user_data[16];
1705 unsigned char nuser_data[16];
1706 unsigned char src_name[8];
1707 struct sock *sk, *nsk;
1708 struct iucv_sock *iucv, *niucv;
1709 int err;
1710
1711 memcpy(src_name, ipuser, 8);
1712 EBCASC(src_name, 8);
1713 /* Find out if this path belongs to af_iucv. */
1714 read_lock(&iucv_sk_list.lock);
1715 iucv = NULL;
1716 sk = NULL;
1717 sk_for_each(sk, &iucv_sk_list.head)
1718 if (sk->sk_state == IUCV_LISTEN &&
1719 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1720 /*
1721 * Found a listening socket with
1722 * src_name == ipuser[0-7].
1723 */
1724 iucv = iucv_sk(sk);
1725 break;
1726 }
1727 read_unlock(&iucv_sk_list.lock);
1728 if (!iucv)
1729 /* No socket found, not one of our paths. */
1730 return -EINVAL;
1731
1732 bh_lock_sock(sk);
1733
1734 /* Check if parent socket is listening */
1735 low_nmcpy(user_data, iucv->src_name);
1736 high_nmcpy(user_data, iucv->dst_name);
1737 ASCEBC(user_data, sizeof(user_data));
1738 if (sk->sk_state != IUCV_LISTEN) {
1739 err = pr_iucv->path_sever(path, user_data);
1740 iucv_path_free(path);
1741 goto fail;
1742 }
1743
1744 /* Check for backlog size */
1745 if (sk_acceptq_is_full(sk)) {
1746 err = pr_iucv->path_sever(path, user_data);
1747 iucv_path_free(path);
1748 goto fail;
1749 }
1750
1751 /* Create the new socket */
1752 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1753 if (!nsk) {
1754 err = pr_iucv->path_sever(path, user_data);
1755 iucv_path_free(path);
1756 goto fail;
1757 }
1758
1759 niucv = iucv_sk(nsk);
1760 iucv_sock_init(nsk, sk);
1761
1762 /* Set the new iucv_sock */
1763 memcpy(niucv->dst_name, ipuser + 8, 8);
1764 EBCASC(niucv->dst_name, 8);
1765 memcpy(niucv->dst_user_id, ipvmid, 8);
1766 memcpy(niucv->src_name, iucv->src_name, 8);
1767 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1768 niucv->path = path;
1769
1770 /* Call iucv_accept */
1771 high_nmcpy(nuser_data, ipuser + 8);
1772 memcpy(nuser_data + 8, niucv->src_name, 8);
1773 ASCEBC(nuser_data + 8, 8);
1774
1775 /* set message limit for path based on msglimit of accepting socket */
1776 niucv->msglimit = iucv->msglimit;
1777 path->msglim = iucv->msglimit;
1778 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1779 if (err) {
1780 iucv_sever_path(nsk, 1);
1781 iucv_sock_kill(nsk);
1782 goto fail;
1783 }
1784
1785 iucv_accept_enqueue(sk, nsk);
1786
1787 /* Wake up accept */
1788 nsk->sk_state = IUCV_CONNECTED;
1789 sk->sk_data_ready(sk);
1790 err = 0;
1791 fail:
1792 bh_unlock_sock(sk);
1793 return 0;
1794 }
1795
1796 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1797 {
1798 struct sock *sk = path->private;
1799
1800 sk->sk_state = IUCV_CONNECTED;
1801 sk->sk_state_change(sk);
1802 }
1803
1804 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1805 {
1806 struct sock *sk = path->private;
1807 struct iucv_sock *iucv = iucv_sk(sk);
1808 struct sk_buff *skb;
1809 struct sock_msg_q *save_msg;
1810 int len;
1811
1812 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1813 pr_iucv->message_reject(path, msg);
1814 return;
1815 }
1816
1817 spin_lock(&iucv->message_q.lock);
1818
1819 if (!list_empty(&iucv->message_q.list) ||
1820 !skb_queue_empty(&iucv->backlog_skb_q))
1821 goto save_message;
1822
1823 len = atomic_read(&sk->sk_rmem_alloc);
1824 len += SKB_TRUESIZE(iucv_msg_length(msg));
1825 if (len > sk->sk_rcvbuf)
1826 goto save_message;
1827
1828 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1829 if (!skb)
1830 goto save_message;
1831
1832 iucv_process_message(sk, skb, path, msg);
1833 goto out_unlock;
1834
1835 save_message:
1836 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1837 if (!save_msg)
1838 goto out_unlock;
1839 save_msg->path = path;
1840 save_msg->msg = *msg;
1841
1842 list_add_tail(&save_msg->list, &iucv->message_q.list);
1843
1844 out_unlock:
1845 spin_unlock(&iucv->message_q.lock);
1846 }
1847
1848 static void iucv_callback_txdone(struct iucv_path *path,
1849 struct iucv_message *msg)
1850 {
1851 struct sock *sk = path->private;
1852 struct sk_buff *this = NULL;
1853 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1854 struct sk_buff *list_skb = list->next;
1855 unsigned long flags;
1856
1857 bh_lock_sock(sk);
1858 if (!skb_queue_empty(list)) {
1859 spin_lock_irqsave(&list->lock, flags);
1860
1861 while (list_skb != (struct sk_buff *)list) {
1862 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1863 this = list_skb;
1864 break;
1865 }
1866 list_skb = list_skb->next;
1867 }
1868 if (this)
1869 __skb_unlink(this, list);
1870
1871 spin_unlock_irqrestore(&list->lock, flags);
1872
1873 if (this) {
1874 kfree_skb(this);
1875 /* wake up any process waiting for sending */
1876 iucv_sock_wake_msglim(sk);
1877 }
1878 }
1879
1880 if (sk->sk_state == IUCV_CLOSING) {
1881 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1882 sk->sk_state = IUCV_CLOSED;
1883 sk->sk_state_change(sk);
1884 }
1885 }
1886 bh_unlock_sock(sk);
1887
1888 }
1889
1890 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1891 {
1892 struct sock *sk = path->private;
1893
1894 if (sk->sk_state == IUCV_CLOSED)
1895 return;
1896
1897 bh_lock_sock(sk);
1898 iucv_sever_path(sk, 1);
1899 sk->sk_state = IUCV_DISCONN;
1900
1901 sk->sk_state_change(sk);
1902 bh_unlock_sock(sk);
1903 }
1904
1905 /* called if the other communication side shuts down its RECV direction;
1906 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1907 */
1908 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1909 {
1910 struct sock *sk = path->private;
1911
1912 bh_lock_sock(sk);
1913 if (sk->sk_state != IUCV_CLOSED) {
1914 sk->sk_shutdown |= SEND_SHUTDOWN;
1915 sk->sk_state_change(sk);
1916 }
1917 bh_unlock_sock(sk);
1918 }
1919
1920 /***************** HiperSockets transport callbacks ********************/
1921 static void afiucv_swap_src_dest(struct sk_buff *skb)
1922 {
1923 struct af_iucv_trans_hdr *trans_hdr =
1924 (struct af_iucv_trans_hdr *)skb->data;
1925 char tmpID[8];
1926 char tmpName[8];
1927
1928 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1929 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1930 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1931 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1932 memcpy(tmpID, trans_hdr->srcUserID, 8);
1933 memcpy(tmpName, trans_hdr->srcAppName, 8);
1934 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1935 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1936 memcpy(trans_hdr->destUserID, tmpID, 8);
1937 memcpy(trans_hdr->destAppName, tmpName, 8);
1938 skb_push(skb, ETH_HLEN);
1939 memset(skb->data, 0, ETH_HLEN);
1940 }
1941
1942 /**
1943 * afiucv_hs_callback_syn - react on received SYN
1944 **/
1945 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1946 {
1947 struct sock *nsk;
1948 struct iucv_sock *iucv, *niucv;
1949 struct af_iucv_trans_hdr *trans_hdr;
1950 int err;
1951
1952 iucv = iucv_sk(sk);
1953 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1954 if (!iucv) {
1955 /* no sock - connection refused */
1956 afiucv_swap_src_dest(skb);
1957 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1958 err = dev_queue_xmit(skb);
1959 goto out;
1960 }
1961
1962 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1963 bh_lock_sock(sk);
1964 if ((sk->sk_state != IUCV_LISTEN) ||
1965 sk_acceptq_is_full(sk) ||
1966 !nsk) {
1967 /* error on server socket - connection refused */
1968 afiucv_swap_src_dest(skb);
1969 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1970 err = dev_queue_xmit(skb);
1971 iucv_sock_kill(nsk);
1972 bh_unlock_sock(sk);
1973 goto out;
1974 }
1975
1976 niucv = iucv_sk(nsk);
1977 iucv_sock_init(nsk, sk);
1978 niucv->transport = AF_IUCV_TRANS_HIPER;
1979 niucv->msglimit = iucv->msglimit;
1980 if (!trans_hdr->window)
1981 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1982 else
1983 niucv->msglimit_peer = trans_hdr->window;
1984 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1985 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1986 memcpy(niucv->src_name, iucv->src_name, 8);
1987 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1988 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1989 niucv->hs_dev = iucv->hs_dev;
1990 dev_hold(niucv->hs_dev);
1991 afiucv_swap_src_dest(skb);
1992 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1993 trans_hdr->window = niucv->msglimit;
1994 /* if receiver acks the xmit connection is established */
1995 err = dev_queue_xmit(skb);
1996 if (!err) {
1997 iucv_accept_enqueue(sk, nsk);
1998 nsk->sk_state = IUCV_CONNECTED;
1999 sk->sk_data_ready(sk);
2000 } else
2001 iucv_sock_kill(nsk);
2002 bh_unlock_sock(sk);
2003
2004 out:
2005 return NET_RX_SUCCESS;
2006 }
2007
2008 /**
2009 * afiucv_hs_callback_synack() - react on received SYN-ACK
2010 **/
2011 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2012 {
2013 struct iucv_sock *iucv = iucv_sk(sk);
2014 struct af_iucv_trans_hdr *trans_hdr =
2015 (struct af_iucv_trans_hdr *)skb->data;
2016
2017 if (!iucv)
2018 goto out;
2019 if (sk->sk_state != IUCV_BOUND)
2020 goto out;
2021 bh_lock_sock(sk);
2022 iucv->msglimit_peer = trans_hdr->window;
2023 sk->sk_state = IUCV_CONNECTED;
2024 sk->sk_state_change(sk);
2025 bh_unlock_sock(sk);
2026 out:
2027 kfree_skb(skb);
2028 return NET_RX_SUCCESS;
2029 }
2030
2031 /**
2032 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2033 **/
2034 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2035 {
2036 struct iucv_sock *iucv = iucv_sk(sk);
2037
2038 if (!iucv)
2039 goto out;
2040 if (sk->sk_state != IUCV_BOUND)
2041 goto out;
2042 bh_lock_sock(sk);
2043 sk->sk_state = IUCV_DISCONN;
2044 sk->sk_state_change(sk);
2045 bh_unlock_sock(sk);
2046 out:
2047 kfree_skb(skb);
2048 return NET_RX_SUCCESS;
2049 }
2050
2051 /**
2052 * afiucv_hs_callback_fin() - react on received FIN
2053 **/
2054 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2055 {
2056 struct iucv_sock *iucv = iucv_sk(sk);
2057
2058 /* other end of connection closed */
2059 if (!iucv)
2060 goto out;
2061 bh_lock_sock(sk);
2062 if (sk->sk_state == IUCV_CONNECTED) {
2063 sk->sk_state = IUCV_DISCONN;
2064 sk->sk_state_change(sk);
2065 }
2066 bh_unlock_sock(sk);
2067 out:
2068 kfree_skb(skb);
2069 return NET_RX_SUCCESS;
2070 }
2071
2072 /**
2073 * afiucv_hs_callback_win() - react on received WIN
2074 **/
2075 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2076 {
2077 struct iucv_sock *iucv = iucv_sk(sk);
2078 struct af_iucv_trans_hdr *trans_hdr =
2079 (struct af_iucv_trans_hdr *)skb->data;
2080
2081 if (!iucv)
2082 return NET_RX_SUCCESS;
2083
2084 if (sk->sk_state != IUCV_CONNECTED)
2085 return NET_RX_SUCCESS;
2086
2087 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2088 iucv_sock_wake_msglim(sk);
2089 return NET_RX_SUCCESS;
2090 }
2091
2092 /**
2093 * afiucv_hs_callback_rx() - react on received data
2094 **/
2095 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2096 {
2097 struct iucv_sock *iucv = iucv_sk(sk);
2098
2099 if (!iucv) {
2100 kfree_skb(skb);
2101 return NET_RX_SUCCESS;
2102 }
2103
2104 if (sk->sk_state != IUCV_CONNECTED) {
2105 kfree_skb(skb);
2106 return NET_RX_SUCCESS;
2107 }
2108
2109 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2110 kfree_skb(skb);
2111 return NET_RX_SUCCESS;
2112 }
2113
2114 /* write stuff from iucv_msg to skb cb */
2115 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2116 skb_reset_transport_header(skb);
2117 skb_reset_network_header(skb);
2118 IUCV_SKB_CB(skb)->offset = 0;
2119 spin_lock(&iucv->message_q.lock);
2120 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2121 if (sock_queue_rcv_skb(sk, skb)) {
2122 /* handle rcv queue full */
2123 skb_queue_tail(&iucv->backlog_skb_q, skb);
2124 }
2125 } else
2126 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2127 spin_unlock(&iucv->message_q.lock);
2128 return NET_RX_SUCCESS;
2129 }
2130
2131 /**
2132 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2133 * transport
2134 * called from netif RX softirq
2135 **/
2136 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2137 struct packet_type *pt, struct net_device *orig_dev)
2138 {
2139 struct sock *sk;
2140 struct iucv_sock *iucv;
2141 struct af_iucv_trans_hdr *trans_hdr;
2142 char nullstring[8];
2143 int err = 0;
2144
2145 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2146 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2147 (int)skb->len,
2148 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2149 kfree_skb(skb);
2150 return NET_RX_SUCCESS;
2151 }
2152 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2153 if (skb_linearize(skb)) {
2154 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2155 (int)skb->len);
2156 kfree_skb(skb);
2157 return NET_RX_SUCCESS;
2158 }
2159 skb_pull(skb, ETH_HLEN);
2160 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2161 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2162 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2163 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2164 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2165 memset(nullstring, 0, sizeof(nullstring));
2166 iucv = NULL;
2167 sk = NULL;
2168 read_lock(&iucv_sk_list.lock);
2169 sk_for_each(sk, &iucv_sk_list.head) {
2170 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2171 if ((!memcmp(&iucv_sk(sk)->src_name,
2172 trans_hdr->destAppName, 8)) &&
2173 (!memcmp(&iucv_sk(sk)->src_user_id,
2174 trans_hdr->destUserID, 8)) &&
2175 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2176 (!memcmp(&iucv_sk(sk)->dst_user_id,
2177 nullstring, 8))) {
2178 iucv = iucv_sk(sk);
2179 break;
2180 }
2181 } else {
2182 if ((!memcmp(&iucv_sk(sk)->src_name,
2183 trans_hdr->destAppName, 8)) &&
2184 (!memcmp(&iucv_sk(sk)->src_user_id,
2185 trans_hdr->destUserID, 8)) &&
2186 (!memcmp(&iucv_sk(sk)->dst_name,
2187 trans_hdr->srcAppName, 8)) &&
2188 (!memcmp(&iucv_sk(sk)->dst_user_id,
2189 trans_hdr->srcUserID, 8))) {
2190 iucv = iucv_sk(sk);
2191 break;
2192 }
2193 }
2194 }
2195 read_unlock(&iucv_sk_list.lock);
2196 if (!iucv)
2197 sk = NULL;
2198
2199 /* no sock
2200 how should we send with no sock
2201 1) send without sock no send rc checking?
2202 2) introduce default sock to handle this cases
2203
2204 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2205 data -> send FIN
2206 SYN|ACK, SYN|FIN, FIN -> no action? */
2207
2208 switch (trans_hdr->flags) {
2209 case AF_IUCV_FLAG_SYN:
2210 /* connect request */
2211 err = afiucv_hs_callback_syn(sk, skb);
2212 break;
2213 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2214 /* connect request confirmed */
2215 err = afiucv_hs_callback_synack(sk, skb);
2216 break;
2217 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2218 /* connect request refused */
2219 err = afiucv_hs_callback_synfin(sk, skb);
2220 break;
2221 case (AF_IUCV_FLAG_FIN):
2222 /* close request */
2223 err = afiucv_hs_callback_fin(sk, skb);
2224 break;
2225 case (AF_IUCV_FLAG_WIN):
2226 err = afiucv_hs_callback_win(sk, skb);
2227 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2228 kfree_skb(skb);
2229 break;
2230 }
2231 /* fall through and receive non-zero length data */
2232 case (AF_IUCV_FLAG_SHT):
2233 /* shutdown request */
2234 /* fall through and receive zero length data */
2235 case 0:
2236 /* plain data frame */
2237 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2238 err = afiucv_hs_callback_rx(sk, skb);
2239 break;
2240 default:
2241 ;
2242 }
2243
2244 return err;
2245 }
2246
2247 /**
2248 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2249 * transport
2250 **/
2251 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2252 enum iucv_tx_notify n)
2253 {
2254 struct sock *isk = skb->sk;
2255 struct sock *sk = NULL;
2256 struct iucv_sock *iucv = NULL;
2257 struct sk_buff_head *list;
2258 struct sk_buff *list_skb;
2259 struct sk_buff *nskb;
2260 unsigned long flags;
2261
2262 read_lock_irqsave(&iucv_sk_list.lock, flags);
2263 sk_for_each(sk, &iucv_sk_list.head)
2264 if (sk == isk) {
2265 iucv = iucv_sk(sk);
2266 break;
2267 }
2268 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2269
2270 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2271 return;
2272
2273 list = &iucv->send_skb_q;
2274 spin_lock_irqsave(&list->lock, flags);
2275 if (skb_queue_empty(list))
2276 goto out_unlock;
2277 list_skb = list->next;
2278 nskb = list_skb->next;
2279 while (list_skb != (struct sk_buff *)list) {
2280 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2281 switch (n) {
2282 case TX_NOTIFY_OK:
2283 __skb_unlink(list_skb, list);
2284 kfree_skb(list_skb);
2285 iucv_sock_wake_msglim(sk);
2286 break;
2287 case TX_NOTIFY_PENDING:
2288 atomic_inc(&iucv->pendings);
2289 break;
2290 case TX_NOTIFY_DELAYED_OK:
2291 __skb_unlink(list_skb, list);
2292 atomic_dec(&iucv->pendings);
2293 if (atomic_read(&iucv->pendings) <= 0)
2294 iucv_sock_wake_msglim(sk);
2295 kfree_skb(list_skb);
2296 break;
2297 case TX_NOTIFY_UNREACHABLE:
2298 case TX_NOTIFY_DELAYED_UNREACHABLE:
2299 case TX_NOTIFY_TPQFULL: /* not yet used */
2300 case TX_NOTIFY_GENERALERROR:
2301 case TX_NOTIFY_DELAYED_GENERALERROR:
2302 __skb_unlink(list_skb, list);
2303 kfree_skb(list_skb);
2304 if (sk->sk_state == IUCV_CONNECTED) {
2305 sk->sk_state = IUCV_DISCONN;
2306 sk->sk_state_change(sk);
2307 }
2308 break;
2309 }
2310 break;
2311 }
2312 list_skb = nskb;
2313 nskb = nskb->next;
2314 }
2315 out_unlock:
2316 spin_unlock_irqrestore(&list->lock, flags);
2317
2318 if (sk->sk_state == IUCV_CLOSING) {
2319 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2320 sk->sk_state = IUCV_CLOSED;
2321 sk->sk_state_change(sk);
2322 }
2323 }
2324
2325 }
2326
2327 /*
2328 * afiucv_netdev_event: handle netdev notifier chain events
2329 */
2330 static int afiucv_netdev_event(struct notifier_block *this,
2331 unsigned long event, void *ptr)
2332 {
2333 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2334 struct sock *sk;
2335 struct iucv_sock *iucv;
2336
2337 switch (event) {
2338 case NETDEV_REBOOT:
2339 case NETDEV_GOING_DOWN:
2340 sk_for_each(sk, &iucv_sk_list.head) {
2341 iucv = iucv_sk(sk);
2342 if ((iucv->hs_dev == event_dev) &&
2343 (sk->sk_state == IUCV_CONNECTED)) {
2344 if (event == NETDEV_GOING_DOWN)
2345 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2346 sk->sk_state = IUCV_DISCONN;
2347 sk->sk_state_change(sk);
2348 }
2349 }
2350 break;
2351 case NETDEV_DOWN:
2352 case NETDEV_UNREGISTER:
2353 default:
2354 break;
2355 }
2356 return NOTIFY_DONE;
2357 }
2358
2359 static struct notifier_block afiucv_netdev_notifier = {
2360 .notifier_call = afiucv_netdev_event,
2361 };
2362
2363 static const struct proto_ops iucv_sock_ops = {
2364 .family = PF_IUCV,
2365 .owner = THIS_MODULE,
2366 .release = iucv_sock_release,
2367 .bind = iucv_sock_bind,
2368 .connect = iucv_sock_connect,
2369 .listen = iucv_sock_listen,
2370 .accept = iucv_sock_accept,
2371 .getname = iucv_sock_getname,
2372 .sendmsg = iucv_sock_sendmsg,
2373 .recvmsg = iucv_sock_recvmsg,
2374 .poll = iucv_sock_poll,
2375 .ioctl = sock_no_ioctl,
2376 .mmap = sock_no_mmap,
2377 .socketpair = sock_no_socketpair,
2378 .shutdown = iucv_sock_shutdown,
2379 .setsockopt = iucv_sock_setsockopt,
2380 .getsockopt = iucv_sock_getsockopt,
2381 };
2382
2383 static const struct net_proto_family iucv_sock_family_ops = {
2384 .family = AF_IUCV,
2385 .owner = THIS_MODULE,
2386 .create = iucv_sock_create,
2387 };
2388
2389 static struct packet_type iucv_packet_type = {
2390 .type = cpu_to_be16(ETH_P_AF_IUCV),
2391 .func = afiucv_hs_rcv,
2392 };
2393
2394 static int afiucv_iucv_init(void)
2395 {
2396 int err;
2397
2398 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2399 if (err)
2400 goto out;
2401 /* establish dummy device */
2402 af_iucv_driver.bus = pr_iucv->bus;
2403 err = driver_register(&af_iucv_driver);
2404 if (err)
2405 goto out_iucv;
2406 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2407 if (!af_iucv_dev) {
2408 err = -ENOMEM;
2409 goto out_driver;
2410 }
2411 dev_set_name(af_iucv_dev, "af_iucv");
2412 af_iucv_dev->bus = pr_iucv->bus;
2413 af_iucv_dev->parent = pr_iucv->root;
2414 af_iucv_dev->release = (void (*)(struct device *))kfree;
2415 af_iucv_dev->driver = &af_iucv_driver;
2416 err = device_register(af_iucv_dev);
2417 if (err)
2418 goto out_driver;
2419 return 0;
2420
2421 out_driver:
2422 driver_unregister(&af_iucv_driver);
2423 out_iucv:
2424 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2425 out:
2426 return err;
2427 }
2428
2429 static int __init afiucv_init(void)
2430 {
2431 int err;
2432
2433 if (MACHINE_IS_VM) {
2434 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2435 if (unlikely(err)) {
2436 WARN_ON(err);
2437 err = -EPROTONOSUPPORT;
2438 goto out;
2439 }
2440
2441 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2442 if (!pr_iucv) {
2443 printk(KERN_WARNING "iucv_if lookup failed\n");
2444 memset(&iucv_userid, 0, sizeof(iucv_userid));
2445 }
2446 } else {
2447 memset(&iucv_userid, 0, sizeof(iucv_userid));
2448 pr_iucv = NULL;
2449 }
2450
2451 err = proto_register(&iucv_proto, 0);
2452 if (err)
2453 goto out;
2454 err = sock_register(&iucv_sock_family_ops);
2455 if (err)
2456 goto out_proto;
2457
2458 if (pr_iucv) {
2459 err = afiucv_iucv_init();
2460 if (err)
2461 goto out_sock;
2462 } else
2463 register_netdevice_notifier(&afiucv_netdev_notifier);
2464 dev_add_pack(&iucv_packet_type);
2465 return 0;
2466
2467 out_sock:
2468 sock_unregister(PF_IUCV);
2469 out_proto:
2470 proto_unregister(&iucv_proto);
2471 out:
2472 if (pr_iucv)
2473 symbol_put(iucv_if);
2474 return err;
2475 }
2476
2477 static void __exit afiucv_exit(void)
2478 {
2479 if (pr_iucv) {
2480 device_unregister(af_iucv_dev);
2481 driver_unregister(&af_iucv_driver);
2482 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2483 symbol_put(iucv_if);
2484 } else
2485 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2486 dev_remove_pack(&iucv_packet_type);
2487 sock_unregister(PF_IUCV);
2488 proto_unregister(&iucv_proto);
2489 }
2490
2491 module_init(afiucv_init);
2492 module_exit(afiucv_exit);
2493
2494 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2495 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2496 MODULE_VERSION(VERSION);
2497 MODULE_LICENSE("GPL");
2498 MODULE_ALIAS_NETPROTO(PF_IUCV);
2499
Linux with added FPC-III support