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Merge tag 'vfio-v5.11-rc1' of git://github.com/awilliam/linux-vfio
[mirror_ubuntu-hirsute-kernel.git] / net / iucv / af_iucv.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IUCV protocol stack for Linux on zSeries
4 *
5 * Copyright IBM Corp. 2006, 2009
6 *
7 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
8 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
9 * PM functions:
10 * Ursula Braun <ursula.braun@de.ibm.com>
11 */
12
13 #define KMSG_COMPONENT "af_iucv"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16 #include <linux/module.h>
17 #include <linux/netdevice.h>
18 #include <linux/types.h>
19 #include <linux/limits.h>
20 #include <linux/list.h>
21 #include <linux/errno.h>
22 #include <linux/kernel.h>
23 #include <linux/sched/signal.h>
24 #include <linux/slab.h>
25 #include <linux/skbuff.h>
26 #include <linux/init.h>
27 #include <linux/poll.h>
28 #include <linux/security.h>
29 #include <net/sock.h>
30 #include <asm/ebcdic.h>
31 #include <asm/cpcmd.h>
32 #include <linux/kmod.h>
33
34 #include <net/iucv/af_iucv.h>
35
36 #define VERSION "1.2"
37
38 static char iucv_userid[80];
39
40 static struct proto iucv_proto = {
41 .name = "AF_IUCV",
42 .owner = THIS_MODULE,
43 .obj_size = sizeof(struct iucv_sock),
44 };
45
46 static struct iucv_interface *pr_iucv;
47
48 /* special AF_IUCV IPRM messages */
49 static const u8 iprm_shutdown[8] =
50 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
51
52 #define TRGCLS_SIZE sizeof_field(struct iucv_message, class)
53
54 #define __iucv_sock_wait(sk, condition, timeo, ret) \
55 do { \
56 DEFINE_WAIT(__wait); \
57 long __timeo = timeo; \
58 ret = 0; \
59 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
60 while (!(condition)) { \
61 if (!__timeo) { \
62 ret = -EAGAIN; \
63 break; \
64 } \
65 if (signal_pending(current)) { \
66 ret = sock_intr_errno(__timeo); \
67 break; \
68 } \
69 release_sock(sk); \
70 __timeo = schedule_timeout(__timeo); \
71 lock_sock(sk); \
72 ret = sock_error(sk); \
73 if (ret) \
74 break; \
75 } \
76 finish_wait(sk_sleep(sk), &__wait); \
77 } while (0)
78
79 #define iucv_sock_wait(sk, condition, timeo) \
80 ({ \
81 int __ret = 0; \
82 if (!(condition)) \
83 __iucv_sock_wait(sk, condition, timeo, __ret); \
84 __ret; \
85 })
86
87 static struct sock *iucv_accept_dequeue(struct sock *parent,
88 struct socket *newsock);
89 static void iucv_sock_kill(struct sock *sk);
90 static void iucv_sock_close(struct sock *sk);
91
92 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
93
94 /* Call Back functions */
95 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
96 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
97 static void iucv_callback_connack(struct iucv_path *, u8 *);
98 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
99 static void iucv_callback_connrej(struct iucv_path *, u8 *);
100 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
101
102 static struct iucv_sock_list iucv_sk_list = {
103 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
104 .autobind_name = ATOMIC_INIT(0)
105 };
106
107 static struct iucv_handler af_iucv_handler = {
108 .path_pending = iucv_callback_connreq,
109 .path_complete = iucv_callback_connack,
110 .path_severed = iucv_callback_connrej,
111 .message_pending = iucv_callback_rx,
112 .message_complete = iucv_callback_txdone,
113 .path_quiesced = iucv_callback_shutdown,
114 };
115
116 static inline void high_nmcpy(unsigned char *dst, char *src)
117 {
118 memcpy(dst, src, 8);
119 }
120
121 static inline void low_nmcpy(unsigned char *dst, char *src)
122 {
123 memcpy(&dst[8], src, 8);
124 }
125
126 /**
127 * iucv_msg_length() - Returns the length of an iucv message.
128 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
129 *
130 * The function returns the length of the specified iucv message @msg of data
131 * stored in a buffer and of data stored in the parameter list (PRMDATA).
132 *
133 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
134 * data:
135 * PRMDATA[0..6] socket data (max 7 bytes);
136 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
137 *
138 * The socket data length is computed by subtracting the socket data length
139 * value from 0xFF.
140 * If the socket data len is greater 7, then PRMDATA can be used for special
141 * notifications (see iucv_sock_shutdown); and further,
142 * if the socket data len is > 7, the function returns 8.
143 *
144 * Use this function to allocate socket buffers to store iucv message data.
145 */
146 static inline size_t iucv_msg_length(struct iucv_message *msg)
147 {
148 size_t datalen;
149
150 if (msg->flags & IUCV_IPRMDATA) {
151 datalen = 0xff - msg->rmmsg[7];
152 return (datalen < 8) ? datalen : 8;
153 }
154 return msg->length;
155 }
156
157 /**
158 * iucv_sock_in_state() - check for specific states
159 * @sk: sock structure
160 * @state: first iucv sk state
161 * @state: second iucv sk state
162 *
163 * Returns true if the socket in either in the first or second state.
164 */
165 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
166 {
167 return (sk->sk_state == state || sk->sk_state == state2);
168 }
169
170 /**
171 * iucv_below_msglim() - function to check if messages can be sent
172 * @sk: sock structure
173 *
174 * Returns true if the send queue length is lower than the message limit.
175 * Always returns true if the socket is not connected (no iucv path for
176 * checking the message limit).
177 */
178 static inline int iucv_below_msglim(struct sock *sk)
179 {
180 struct iucv_sock *iucv = iucv_sk(sk);
181
182 if (sk->sk_state != IUCV_CONNECTED)
183 return 1;
184 if (iucv->transport == AF_IUCV_TRANS_IUCV)
185 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
186 else
187 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
188 (atomic_read(&iucv->pendings) <= 0));
189 }
190
191 /**
192 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
193 */
194 static void iucv_sock_wake_msglim(struct sock *sk)
195 {
196 struct socket_wq *wq;
197
198 rcu_read_lock();
199 wq = rcu_dereference(sk->sk_wq);
200 if (skwq_has_sleeper(wq))
201 wake_up_interruptible_all(&wq->wait);
202 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
203 rcu_read_unlock();
204 }
205
206 /**
207 * afiucv_hs_send() - send a message through HiperSockets transport
208 */
209 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
210 struct sk_buff *skb, u8 flags)
211 {
212 struct iucv_sock *iucv = iucv_sk(sock);
213 struct af_iucv_trans_hdr *phs_hdr;
214 struct sk_buff *nskb;
215 int err, confirm_recv = 0;
216
217 phs_hdr = skb_push(skb, sizeof(*phs_hdr));
218 memset(phs_hdr, 0, sizeof(*phs_hdr));
219 skb_reset_network_header(skb);
220
221 phs_hdr->magic = ETH_P_AF_IUCV;
222 phs_hdr->version = 1;
223 phs_hdr->flags = flags;
224 if (flags == AF_IUCV_FLAG_SYN)
225 phs_hdr->window = iucv->msglimit;
226 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
227 confirm_recv = atomic_read(&iucv->msg_recv);
228 phs_hdr->window = confirm_recv;
229 if (confirm_recv)
230 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
231 }
232 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
233 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
234 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
235 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
236 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
237 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
238 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
239 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
240 if (imsg)
241 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
242
243 skb->dev = iucv->hs_dev;
244 if (!skb->dev) {
245 err = -ENODEV;
246 goto err_free;
247 }
248
249 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
250
251 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
252 err = -ENETDOWN;
253 goto err_free;
254 }
255 if (skb->len > skb->dev->mtu) {
256 if (sock->sk_type == SOCK_SEQPACKET) {
257 err = -EMSGSIZE;
258 goto err_free;
259 }
260 skb_trim(skb, skb->dev->mtu);
261 }
262 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
263
264 __skb_header_release(skb);
265 nskb = skb_clone(skb, GFP_ATOMIC);
266 if (!nskb) {
267 err = -ENOMEM;
268 goto err_free;
269 }
270
271 skb_queue_tail(&iucv->send_skb_q, nskb);
272 err = dev_queue_xmit(skb);
273 if (net_xmit_eval(err)) {
274 skb_unlink(nskb, &iucv->send_skb_q);
275 kfree_skb(nskb);
276 } else {
277 atomic_sub(confirm_recv, &iucv->msg_recv);
278 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
279 }
280 return net_xmit_eval(err);
281
282 err_free:
283 kfree_skb(skb);
284 return err;
285 }
286
287 static struct sock *__iucv_get_sock_by_name(char *nm)
288 {
289 struct sock *sk;
290
291 sk_for_each(sk, &iucv_sk_list.head)
292 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
293 return sk;
294
295 return NULL;
296 }
297
298 static void iucv_sock_destruct(struct sock *sk)
299 {
300 skb_queue_purge(&sk->sk_receive_queue);
301 skb_queue_purge(&sk->sk_error_queue);
302
303 sk_mem_reclaim(sk);
304
305 if (!sock_flag(sk, SOCK_DEAD)) {
306 pr_err("Attempt to release alive iucv socket %p\n", sk);
307 return;
308 }
309
310 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
311 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
312 WARN_ON(sk->sk_wmem_queued);
313 WARN_ON(sk->sk_forward_alloc);
314 }
315
316 /* Cleanup Listen */
317 static void iucv_sock_cleanup_listen(struct sock *parent)
318 {
319 struct sock *sk;
320
321 /* Close non-accepted connections */
322 while ((sk = iucv_accept_dequeue(parent, NULL))) {
323 iucv_sock_close(sk);
324 iucv_sock_kill(sk);
325 }
326
327 parent->sk_state = IUCV_CLOSED;
328 }
329
330 static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
331 {
332 write_lock_bh(&l->lock);
333 sk_add_node(sk, &l->head);
334 write_unlock_bh(&l->lock);
335 }
336
337 static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
338 {
339 write_lock_bh(&l->lock);
340 sk_del_node_init(sk);
341 write_unlock_bh(&l->lock);
342 }
343
344 /* Kill socket (only if zapped and orphaned) */
345 static void iucv_sock_kill(struct sock *sk)
346 {
347 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
348 return;
349
350 iucv_sock_unlink(&iucv_sk_list, sk);
351 sock_set_flag(sk, SOCK_DEAD);
352 sock_put(sk);
353 }
354
355 /* Terminate an IUCV path */
356 static void iucv_sever_path(struct sock *sk, int with_user_data)
357 {
358 unsigned char user_data[16];
359 struct iucv_sock *iucv = iucv_sk(sk);
360 struct iucv_path *path = iucv->path;
361
362 if (iucv->path) {
363 iucv->path = NULL;
364 if (with_user_data) {
365 low_nmcpy(user_data, iucv->src_name);
366 high_nmcpy(user_data, iucv->dst_name);
367 ASCEBC(user_data, sizeof(user_data));
368 pr_iucv->path_sever(path, user_data);
369 } else
370 pr_iucv->path_sever(path, NULL);
371 iucv_path_free(path);
372 }
373 }
374
375 /* Send controlling flags through an IUCV socket for HIPER transport */
376 static int iucv_send_ctrl(struct sock *sk, u8 flags)
377 {
378 struct iucv_sock *iucv = iucv_sk(sk);
379 int err = 0;
380 int blen;
381 struct sk_buff *skb;
382 u8 shutdown = 0;
383
384 blen = sizeof(struct af_iucv_trans_hdr) +
385 LL_RESERVED_SPACE(iucv->hs_dev);
386 if (sk->sk_shutdown & SEND_SHUTDOWN) {
387 /* controlling flags should be sent anyway */
388 shutdown = sk->sk_shutdown;
389 sk->sk_shutdown &= RCV_SHUTDOWN;
390 }
391 skb = sock_alloc_send_skb(sk, blen, 1, &err);
392 if (skb) {
393 skb_reserve(skb, blen);
394 err = afiucv_hs_send(NULL, sk, skb, flags);
395 }
396 if (shutdown)
397 sk->sk_shutdown = shutdown;
398 return err;
399 }
400
401 /* Close an IUCV socket */
402 static void iucv_sock_close(struct sock *sk)
403 {
404 struct iucv_sock *iucv = iucv_sk(sk);
405 unsigned long timeo;
406 int err = 0;
407
408 lock_sock(sk);
409
410 switch (sk->sk_state) {
411 case IUCV_LISTEN:
412 iucv_sock_cleanup_listen(sk);
413 break;
414
415 case IUCV_CONNECTED:
416 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
417 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
418 sk->sk_state = IUCV_DISCONN;
419 sk->sk_state_change(sk);
420 }
421 fallthrough;
422
423 case IUCV_DISCONN:
424 sk->sk_state = IUCV_CLOSING;
425 sk->sk_state_change(sk);
426
427 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
428 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
429 timeo = sk->sk_lingertime;
430 else
431 timeo = IUCV_DISCONN_TIMEOUT;
432 iucv_sock_wait(sk,
433 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
434 timeo);
435 }
436 fallthrough;
437
438 case IUCV_CLOSING:
439 sk->sk_state = IUCV_CLOSED;
440 sk->sk_state_change(sk);
441
442 sk->sk_err = ECONNRESET;
443 sk->sk_state_change(sk);
444
445 skb_queue_purge(&iucv->send_skb_q);
446 skb_queue_purge(&iucv->backlog_skb_q);
447 fallthrough;
448
449 default:
450 iucv_sever_path(sk, 1);
451 }
452
453 if (iucv->hs_dev) {
454 dev_put(iucv->hs_dev);
455 iucv->hs_dev = NULL;
456 sk->sk_bound_dev_if = 0;
457 }
458
459 /* mark socket for deletion by iucv_sock_kill() */
460 sock_set_flag(sk, SOCK_ZAPPED);
461
462 release_sock(sk);
463 }
464
465 static void iucv_sock_init(struct sock *sk, struct sock *parent)
466 {
467 if (parent) {
468 sk->sk_type = parent->sk_type;
469 security_sk_clone(parent, sk);
470 }
471 }
472
473 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
474 {
475 struct sock *sk;
476 struct iucv_sock *iucv;
477
478 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
479 if (!sk)
480 return NULL;
481 iucv = iucv_sk(sk);
482
483 sock_init_data(sock, sk);
484 INIT_LIST_HEAD(&iucv->accept_q);
485 spin_lock_init(&iucv->accept_q_lock);
486 skb_queue_head_init(&iucv->send_skb_q);
487 INIT_LIST_HEAD(&iucv->message_q.list);
488 spin_lock_init(&iucv->message_q.lock);
489 skb_queue_head_init(&iucv->backlog_skb_q);
490 iucv->send_tag = 0;
491 atomic_set(&iucv->pendings, 0);
492 iucv->flags = 0;
493 iucv->msglimit = 0;
494 atomic_set(&iucv->msg_sent, 0);
495 atomic_set(&iucv->msg_recv, 0);
496 iucv->path = NULL;
497 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
498 memset(&iucv->src_user_id , 0, 32);
499 if (pr_iucv)
500 iucv->transport = AF_IUCV_TRANS_IUCV;
501 else
502 iucv->transport = AF_IUCV_TRANS_HIPER;
503
504 sk->sk_destruct = iucv_sock_destruct;
505 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
506
507 sock_reset_flag(sk, SOCK_ZAPPED);
508
509 sk->sk_protocol = proto;
510 sk->sk_state = IUCV_OPEN;
511
512 iucv_sock_link(&iucv_sk_list, sk);
513 return sk;
514 }
515
516 static void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
517 {
518 unsigned long flags;
519 struct iucv_sock *par = iucv_sk(parent);
520
521 sock_hold(sk);
522 spin_lock_irqsave(&par->accept_q_lock, flags);
523 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
524 spin_unlock_irqrestore(&par->accept_q_lock, flags);
525 iucv_sk(sk)->parent = parent;
526 sk_acceptq_added(parent);
527 }
528
529 static void iucv_accept_unlink(struct sock *sk)
530 {
531 unsigned long flags;
532 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
533
534 spin_lock_irqsave(&par->accept_q_lock, flags);
535 list_del_init(&iucv_sk(sk)->accept_q);
536 spin_unlock_irqrestore(&par->accept_q_lock, flags);
537 sk_acceptq_removed(iucv_sk(sk)->parent);
538 iucv_sk(sk)->parent = NULL;
539 sock_put(sk);
540 }
541
542 static struct sock *iucv_accept_dequeue(struct sock *parent,
543 struct socket *newsock)
544 {
545 struct iucv_sock *isk, *n;
546 struct sock *sk;
547
548 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
549 sk = (struct sock *) isk;
550 lock_sock(sk);
551
552 if (sk->sk_state == IUCV_CLOSED) {
553 iucv_accept_unlink(sk);
554 release_sock(sk);
555 continue;
556 }
557
558 if (sk->sk_state == IUCV_CONNECTED ||
559 sk->sk_state == IUCV_DISCONN ||
560 !newsock) {
561 iucv_accept_unlink(sk);
562 if (newsock)
563 sock_graft(sk, newsock);
564
565 release_sock(sk);
566 return sk;
567 }
568
569 release_sock(sk);
570 }
571 return NULL;
572 }
573
574 static void __iucv_auto_name(struct iucv_sock *iucv)
575 {
576 char name[12];
577
578 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
579 while (__iucv_get_sock_by_name(name)) {
580 sprintf(name, "%08x",
581 atomic_inc_return(&iucv_sk_list.autobind_name));
582 }
583 memcpy(iucv->src_name, name, 8);
584 }
585
586 /* Bind an unbound socket */
587 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
588 int addr_len)
589 {
590 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
591 char uid[sizeof(sa->siucv_user_id)];
592 struct sock *sk = sock->sk;
593 struct iucv_sock *iucv;
594 int err = 0;
595 struct net_device *dev;
596
597 /* Verify the input sockaddr */
598 if (addr_len < sizeof(struct sockaddr_iucv) ||
599 addr->sa_family != AF_IUCV)
600 return -EINVAL;
601
602 lock_sock(sk);
603 if (sk->sk_state != IUCV_OPEN) {
604 err = -EBADFD;
605 goto done;
606 }
607
608 write_lock_bh(&iucv_sk_list.lock);
609
610 iucv = iucv_sk(sk);
611 if (__iucv_get_sock_by_name(sa->siucv_name)) {
612 err = -EADDRINUSE;
613 goto done_unlock;
614 }
615 if (iucv->path)
616 goto done_unlock;
617
618 /* Bind the socket */
619 if (pr_iucv)
620 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
621 goto vm_bind; /* VM IUCV transport */
622
623 /* try hiper transport */
624 memcpy(uid, sa->siucv_user_id, sizeof(uid));
625 ASCEBC(uid, 8);
626 rcu_read_lock();
627 for_each_netdev_rcu(&init_net, dev) {
628 if (!memcmp(dev->perm_addr, uid, 8)) {
629 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
630 /* Check for unitialized siucv_name */
631 if (strncmp(sa->siucv_name, " ", 8) == 0)
632 __iucv_auto_name(iucv);
633 else
634 memcpy(iucv->src_name, sa->siucv_name, 8);
635 sk->sk_bound_dev_if = dev->ifindex;
636 iucv->hs_dev = dev;
637 dev_hold(dev);
638 sk->sk_state = IUCV_BOUND;
639 iucv->transport = AF_IUCV_TRANS_HIPER;
640 if (!iucv->msglimit)
641 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
642 rcu_read_unlock();
643 goto done_unlock;
644 }
645 }
646 rcu_read_unlock();
647 vm_bind:
648 if (pr_iucv) {
649 /* use local userid for backward compat */
650 memcpy(iucv->src_name, sa->siucv_name, 8);
651 memcpy(iucv->src_user_id, iucv_userid, 8);
652 sk->sk_state = IUCV_BOUND;
653 iucv->transport = AF_IUCV_TRANS_IUCV;
654 sk->sk_allocation |= GFP_DMA;
655 if (!iucv->msglimit)
656 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
657 goto done_unlock;
658 }
659 /* found no dev to bind */
660 err = -ENODEV;
661 done_unlock:
662 /* Release the socket list lock */
663 write_unlock_bh(&iucv_sk_list.lock);
664 done:
665 release_sock(sk);
666 return err;
667 }
668
669 /* Automatically bind an unbound socket */
670 static int iucv_sock_autobind(struct sock *sk)
671 {
672 struct iucv_sock *iucv = iucv_sk(sk);
673 int err = 0;
674
675 if (unlikely(!pr_iucv))
676 return -EPROTO;
677
678 memcpy(iucv->src_user_id, iucv_userid, 8);
679 iucv->transport = AF_IUCV_TRANS_IUCV;
680 sk->sk_allocation |= GFP_DMA;
681
682 write_lock_bh(&iucv_sk_list.lock);
683 __iucv_auto_name(iucv);
684 write_unlock_bh(&iucv_sk_list.lock);
685
686 if (!iucv->msglimit)
687 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
688
689 return err;
690 }
691
692 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
693 {
694 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
695 struct sock *sk = sock->sk;
696 struct iucv_sock *iucv = iucv_sk(sk);
697 unsigned char user_data[16];
698 int err;
699
700 high_nmcpy(user_data, sa->siucv_name);
701 low_nmcpy(user_data, iucv->src_name);
702 ASCEBC(user_data, sizeof(user_data));
703
704 /* Create path. */
705 iucv->path = iucv_path_alloc(iucv->msglimit,
706 IUCV_IPRMDATA, GFP_KERNEL);
707 if (!iucv->path) {
708 err = -ENOMEM;
709 goto done;
710 }
711 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
712 sa->siucv_user_id, NULL, user_data,
713 sk);
714 if (err) {
715 iucv_path_free(iucv->path);
716 iucv->path = NULL;
717 switch (err) {
718 case 0x0b: /* Target communicator is not logged on */
719 err = -ENETUNREACH;
720 break;
721 case 0x0d: /* Max connections for this guest exceeded */
722 case 0x0e: /* Max connections for target guest exceeded */
723 err = -EAGAIN;
724 break;
725 case 0x0f: /* Missing IUCV authorization */
726 err = -EACCES;
727 break;
728 default:
729 err = -ECONNREFUSED;
730 break;
731 }
732 }
733 done:
734 return err;
735 }
736
737 /* Connect an unconnected socket */
738 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
739 int alen, int flags)
740 {
741 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
742 struct sock *sk = sock->sk;
743 struct iucv_sock *iucv = iucv_sk(sk);
744 int err;
745
746 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
747 return -EINVAL;
748
749 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
750 return -EBADFD;
751
752 if (sk->sk_state == IUCV_OPEN &&
753 iucv->transport == AF_IUCV_TRANS_HIPER)
754 return -EBADFD; /* explicit bind required */
755
756 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
757 return -EINVAL;
758
759 if (sk->sk_state == IUCV_OPEN) {
760 err = iucv_sock_autobind(sk);
761 if (unlikely(err))
762 return err;
763 }
764
765 lock_sock(sk);
766
767 /* Set the destination information */
768 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
769 memcpy(iucv->dst_name, sa->siucv_name, 8);
770
771 if (iucv->transport == AF_IUCV_TRANS_HIPER)
772 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
773 else
774 err = afiucv_path_connect(sock, addr);
775 if (err)
776 goto done;
777
778 if (sk->sk_state != IUCV_CONNECTED)
779 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
780 IUCV_DISCONN),
781 sock_sndtimeo(sk, flags & O_NONBLOCK));
782
783 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
784 err = -ECONNREFUSED;
785
786 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
787 iucv_sever_path(sk, 0);
788
789 done:
790 release_sock(sk);
791 return err;
792 }
793
794 /* Move a socket into listening state. */
795 static int iucv_sock_listen(struct socket *sock, int backlog)
796 {
797 struct sock *sk = sock->sk;
798 int err;
799
800 lock_sock(sk);
801
802 err = -EINVAL;
803 if (sk->sk_state != IUCV_BOUND)
804 goto done;
805
806 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
807 goto done;
808
809 sk->sk_max_ack_backlog = backlog;
810 sk->sk_ack_backlog = 0;
811 sk->sk_state = IUCV_LISTEN;
812 err = 0;
813
814 done:
815 release_sock(sk);
816 return err;
817 }
818
819 /* Accept a pending connection */
820 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
821 int flags, bool kern)
822 {
823 DECLARE_WAITQUEUE(wait, current);
824 struct sock *sk = sock->sk, *nsk;
825 long timeo;
826 int err = 0;
827
828 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
829
830 if (sk->sk_state != IUCV_LISTEN) {
831 err = -EBADFD;
832 goto done;
833 }
834
835 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
836
837 /* Wait for an incoming connection */
838 add_wait_queue_exclusive(sk_sleep(sk), &wait);
839 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
840 set_current_state(TASK_INTERRUPTIBLE);
841 if (!timeo) {
842 err = -EAGAIN;
843 break;
844 }
845
846 release_sock(sk);
847 timeo = schedule_timeout(timeo);
848 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
849
850 if (sk->sk_state != IUCV_LISTEN) {
851 err = -EBADFD;
852 break;
853 }
854
855 if (signal_pending(current)) {
856 err = sock_intr_errno(timeo);
857 break;
858 }
859 }
860
861 set_current_state(TASK_RUNNING);
862 remove_wait_queue(sk_sleep(sk), &wait);
863
864 if (err)
865 goto done;
866
867 newsock->state = SS_CONNECTED;
868
869 done:
870 release_sock(sk);
871 return err;
872 }
873
874 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
875 int peer)
876 {
877 DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr);
878 struct sock *sk = sock->sk;
879 struct iucv_sock *iucv = iucv_sk(sk);
880
881 addr->sa_family = AF_IUCV;
882
883 if (peer) {
884 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
885 memcpy(siucv->siucv_name, iucv->dst_name, 8);
886 } else {
887 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
888 memcpy(siucv->siucv_name, iucv->src_name, 8);
889 }
890 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
891 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
892 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
893
894 return sizeof(struct sockaddr_iucv);
895 }
896
897 /**
898 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
899 * @path: IUCV path
900 * @msg: Pointer to a struct iucv_message
901 * @skb: The socket data to send, skb->len MUST BE <= 7
902 *
903 * Send the socket data in the parameter list in the iucv message
904 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
905 * list and the socket data len at index 7 (last byte).
906 * See also iucv_msg_length().
907 *
908 * Returns the error code from the iucv_message_send() call.
909 */
910 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
911 struct sk_buff *skb)
912 {
913 u8 prmdata[8];
914
915 memcpy(prmdata, (void *) skb->data, skb->len);
916 prmdata[7] = 0xff - (u8) skb->len;
917 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
918 (void *) prmdata, 8);
919 }
920
921 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
922 size_t len)
923 {
924 struct sock *sk = sock->sk;
925 struct iucv_sock *iucv = iucv_sk(sk);
926 size_t headroom = 0;
927 size_t linear;
928 struct sk_buff *skb;
929 struct iucv_message txmsg = {0};
930 struct cmsghdr *cmsg;
931 int cmsg_done;
932 long timeo;
933 char user_id[9];
934 char appl_id[9];
935 int err;
936 int noblock = msg->msg_flags & MSG_DONTWAIT;
937
938 err = sock_error(sk);
939 if (err)
940 return err;
941
942 if (msg->msg_flags & MSG_OOB)
943 return -EOPNOTSUPP;
944
945 /* SOCK_SEQPACKET: we do not support segmented records */
946 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
947 return -EOPNOTSUPP;
948
949 lock_sock(sk);
950
951 if (sk->sk_shutdown & SEND_SHUTDOWN) {
952 err = -EPIPE;
953 goto out;
954 }
955
956 /* Return if the socket is not in connected state */
957 if (sk->sk_state != IUCV_CONNECTED) {
958 err = -ENOTCONN;
959 goto out;
960 }
961
962 /* initialize defaults */
963 cmsg_done = 0; /* check for duplicate headers */
964
965 /* iterate over control messages */
966 for_each_cmsghdr(cmsg, msg) {
967 if (!CMSG_OK(msg, cmsg)) {
968 err = -EINVAL;
969 goto out;
970 }
971
972 if (cmsg->cmsg_level != SOL_IUCV)
973 continue;
974
975 if (cmsg->cmsg_type & cmsg_done) {
976 err = -EINVAL;
977 goto out;
978 }
979 cmsg_done |= cmsg->cmsg_type;
980
981 switch (cmsg->cmsg_type) {
982 case SCM_IUCV_TRGCLS:
983 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
984 err = -EINVAL;
985 goto out;
986 }
987
988 /* set iucv message target class */
989 memcpy(&txmsg.class,
990 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
991
992 break;
993
994 default:
995 err = -EINVAL;
996 goto out;
997 }
998 }
999
1000 /* allocate one skb for each iucv message:
1001 * this is fine for SOCK_SEQPACKET (unless we want to support
1002 * segmented records using the MSG_EOR flag), but
1003 * for SOCK_STREAM we might want to improve it in future */
1004 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1005 headroom = sizeof(struct af_iucv_trans_hdr) +
1006 LL_RESERVED_SPACE(iucv->hs_dev);
1007 linear = len;
1008 } else {
1009 if (len < PAGE_SIZE) {
1010 linear = len;
1011 } else {
1012 /* In nonlinear "classic" iucv skb,
1013 * reserve space for iucv_array
1014 */
1015 headroom = sizeof(struct iucv_array) *
1016 (MAX_SKB_FRAGS + 1);
1017 linear = PAGE_SIZE - headroom;
1018 }
1019 }
1020 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1021 noblock, &err, 0);
1022 if (!skb)
1023 goto out;
1024 if (headroom)
1025 skb_reserve(skb, headroom);
1026 skb_put(skb, linear);
1027 skb->len = len;
1028 skb->data_len = len - linear;
1029 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1030 if (err)
1031 goto fail;
1032
1033 /* wait if outstanding messages for iucv path has reached */
1034 timeo = sock_sndtimeo(sk, noblock);
1035 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1036 if (err)
1037 goto fail;
1038
1039 /* return -ECONNRESET if the socket is no longer connected */
1040 if (sk->sk_state != IUCV_CONNECTED) {
1041 err = -ECONNRESET;
1042 goto fail;
1043 }
1044
1045 /* increment and save iucv message tag for msg_completion cbk */
1046 txmsg.tag = iucv->send_tag++;
1047 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1048
1049 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1050 atomic_inc(&iucv->msg_sent);
1051 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1052 if (err) {
1053 atomic_dec(&iucv->msg_sent);
1054 goto out;
1055 }
1056 } else { /* Classic VM IUCV transport */
1057 skb_queue_tail(&iucv->send_skb_q, skb);
1058
1059 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1060 skb->len <= 7) {
1061 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1062
1063 /* on success: there is no message_complete callback */
1064 /* for an IPRMDATA msg; remove skb from send queue */
1065 if (err == 0) {
1066 skb_unlink(skb, &iucv->send_skb_q);
1067 kfree_skb(skb);
1068 }
1069
1070 /* this error should never happen since the */
1071 /* IUCV_IPRMDATA path flag is set... sever path */
1072 if (err == 0x15) {
1073 pr_iucv->path_sever(iucv->path, NULL);
1074 skb_unlink(skb, &iucv->send_skb_q);
1075 err = -EPIPE;
1076 goto fail;
1077 }
1078 } else if (skb_is_nonlinear(skb)) {
1079 struct iucv_array *iba = (struct iucv_array *)skb->head;
1080 int i;
1081
1082 /* skip iucv_array lying in the headroom */
1083 iba[0].address = (u32)(addr_t)skb->data;
1084 iba[0].length = (u32)skb_headlen(skb);
1085 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1086 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1087
1088 iba[i + 1].address =
1089 (u32)(addr_t)skb_frag_address(frag);
1090 iba[i + 1].length = (u32)skb_frag_size(frag);
1091 }
1092 err = pr_iucv->message_send(iucv->path, &txmsg,
1093 IUCV_IPBUFLST, 0,
1094 (void *)iba, skb->len);
1095 } else { /* non-IPRM Linear skb */
1096 err = pr_iucv->message_send(iucv->path, &txmsg,
1097 0, 0, (void *)skb->data, skb->len);
1098 }
1099 if (err) {
1100 if (err == 3) {
1101 user_id[8] = 0;
1102 memcpy(user_id, iucv->dst_user_id, 8);
1103 appl_id[8] = 0;
1104 memcpy(appl_id, iucv->dst_name, 8);
1105 pr_err(
1106 "Application %s on z/VM guest %s exceeds message limit\n",
1107 appl_id, user_id);
1108 err = -EAGAIN;
1109 } else {
1110 err = -EPIPE;
1111 }
1112 skb_unlink(skb, &iucv->send_skb_q);
1113 goto fail;
1114 }
1115 }
1116
1117 release_sock(sk);
1118 return len;
1119
1120 fail:
1121 kfree_skb(skb);
1122 out:
1123 release_sock(sk);
1124 return err;
1125 }
1126
1127 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1128 {
1129 size_t headroom, linear;
1130 struct sk_buff *skb;
1131 int err;
1132
1133 if (len < PAGE_SIZE) {
1134 headroom = 0;
1135 linear = len;
1136 } else {
1137 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1138 linear = PAGE_SIZE - headroom;
1139 }
1140 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1141 0, &err, GFP_ATOMIC | GFP_DMA);
1142 WARN_ONCE(!skb,
1143 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1144 len, err);
1145 if (skb) {
1146 if (headroom)
1147 skb_reserve(skb, headroom);
1148 skb_put(skb, linear);
1149 skb->len = len;
1150 skb->data_len = len - linear;
1151 }
1152 return skb;
1153 }
1154
1155 /* iucv_process_message() - Receive a single outstanding IUCV message
1156 *
1157 * Locking: must be called with message_q.lock held
1158 */
1159 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1160 struct iucv_path *path,
1161 struct iucv_message *msg)
1162 {
1163 int rc;
1164 unsigned int len;
1165
1166 len = iucv_msg_length(msg);
1167
1168 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1169 /* Note: the first 4 bytes are reserved for msg tag */
1170 IUCV_SKB_CB(skb)->class = msg->class;
1171
1172 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1173 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1174 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1175 skb->data = NULL;
1176 skb->len = 0;
1177 }
1178 } else {
1179 if (skb_is_nonlinear(skb)) {
1180 struct iucv_array *iba = (struct iucv_array *)skb->head;
1181 int i;
1182
1183 iba[0].address = (u32)(addr_t)skb->data;
1184 iba[0].length = (u32)skb_headlen(skb);
1185 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1186 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1187
1188 iba[i + 1].address =
1189 (u32)(addr_t)skb_frag_address(frag);
1190 iba[i + 1].length = (u32)skb_frag_size(frag);
1191 }
1192 rc = pr_iucv->message_receive(path, msg,
1193 IUCV_IPBUFLST,
1194 (void *)iba, len, NULL);
1195 } else {
1196 rc = pr_iucv->message_receive(path, msg,
1197 msg->flags & IUCV_IPRMDATA,
1198 skb->data, len, NULL);
1199 }
1200 if (rc) {
1201 kfree_skb(skb);
1202 return;
1203 }
1204 WARN_ON_ONCE(skb->len != len);
1205 }
1206
1207 IUCV_SKB_CB(skb)->offset = 0;
1208 if (sk_filter(sk, skb)) {
1209 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1210 kfree_skb(skb);
1211 return;
1212 }
1213 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1214 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1215 }
1216
1217 /* iucv_process_message_q() - Process outstanding IUCV messages
1218 *
1219 * Locking: must be called with message_q.lock held
1220 */
1221 static void iucv_process_message_q(struct sock *sk)
1222 {
1223 struct iucv_sock *iucv = iucv_sk(sk);
1224 struct sk_buff *skb;
1225 struct sock_msg_q *p, *n;
1226
1227 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1228 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1229 if (!skb)
1230 break;
1231 iucv_process_message(sk, skb, p->path, &p->msg);
1232 list_del(&p->list);
1233 kfree(p);
1234 if (!skb_queue_empty(&iucv->backlog_skb_q))
1235 break;
1236 }
1237 }
1238
1239 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1240 size_t len, int flags)
1241 {
1242 int noblock = flags & MSG_DONTWAIT;
1243 struct sock *sk = sock->sk;
1244 struct iucv_sock *iucv = iucv_sk(sk);
1245 unsigned int copied, rlen;
1246 struct sk_buff *skb, *rskb, *cskb;
1247 int err = 0;
1248 u32 offset;
1249
1250 if ((sk->sk_state == IUCV_DISCONN) &&
1251 skb_queue_empty(&iucv->backlog_skb_q) &&
1252 skb_queue_empty(&sk->sk_receive_queue) &&
1253 list_empty(&iucv->message_q.list))
1254 return 0;
1255
1256 if (flags & (MSG_OOB))
1257 return -EOPNOTSUPP;
1258
1259 /* receive/dequeue next skb:
1260 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1261 skb = skb_recv_datagram(sk, flags, noblock, &err);
1262 if (!skb) {
1263 if (sk->sk_shutdown & RCV_SHUTDOWN)
1264 return 0;
1265 return err;
1266 }
1267
1268 offset = IUCV_SKB_CB(skb)->offset;
1269 rlen = skb->len - offset; /* real length of skb */
1270 copied = min_t(unsigned int, rlen, len);
1271 if (!rlen)
1272 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1273
1274 cskb = skb;
1275 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1276 if (!(flags & MSG_PEEK))
1277 skb_queue_head(&sk->sk_receive_queue, skb);
1278 return -EFAULT;
1279 }
1280
1281 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1282 if (sk->sk_type == SOCK_SEQPACKET) {
1283 if (copied < rlen)
1284 msg->msg_flags |= MSG_TRUNC;
1285 /* each iucv message contains a complete record */
1286 msg->msg_flags |= MSG_EOR;
1287 }
1288
1289 /* create control message to store iucv msg target class:
1290 * get the trgcls from the control buffer of the skb due to
1291 * fragmentation of original iucv message. */
1292 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1293 sizeof(IUCV_SKB_CB(skb)->class),
1294 (void *)&IUCV_SKB_CB(skb)->class);
1295 if (err) {
1296 if (!(flags & MSG_PEEK))
1297 skb_queue_head(&sk->sk_receive_queue, skb);
1298 return err;
1299 }
1300
1301 /* Mark read part of skb as used */
1302 if (!(flags & MSG_PEEK)) {
1303
1304 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1305 if (sk->sk_type == SOCK_STREAM) {
1306 if (copied < rlen) {
1307 IUCV_SKB_CB(skb)->offset = offset + copied;
1308 skb_queue_head(&sk->sk_receive_queue, skb);
1309 goto done;
1310 }
1311 }
1312
1313 kfree_skb(skb);
1314 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1315 atomic_inc(&iucv->msg_recv);
1316 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1317 WARN_ON(1);
1318 iucv_sock_close(sk);
1319 return -EFAULT;
1320 }
1321 }
1322
1323 /* Queue backlog skbs */
1324 spin_lock_bh(&iucv->message_q.lock);
1325 rskb = skb_dequeue(&iucv->backlog_skb_q);
1326 while (rskb) {
1327 IUCV_SKB_CB(rskb)->offset = 0;
1328 if (__sock_queue_rcv_skb(sk, rskb)) {
1329 /* handle rcv queue full */
1330 skb_queue_head(&iucv->backlog_skb_q,
1331 rskb);
1332 break;
1333 }
1334 rskb = skb_dequeue(&iucv->backlog_skb_q);
1335 }
1336 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1337 if (!list_empty(&iucv->message_q.list))
1338 iucv_process_message_q(sk);
1339 if (atomic_read(&iucv->msg_recv) >=
1340 iucv->msglimit / 2) {
1341 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1342 if (err) {
1343 sk->sk_state = IUCV_DISCONN;
1344 sk->sk_state_change(sk);
1345 }
1346 }
1347 }
1348 spin_unlock_bh(&iucv->message_q.lock);
1349 }
1350
1351 done:
1352 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1353 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1354 copied = rlen;
1355
1356 return copied;
1357 }
1358
1359 static inline __poll_t iucv_accept_poll(struct sock *parent)
1360 {
1361 struct iucv_sock *isk, *n;
1362 struct sock *sk;
1363
1364 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1365 sk = (struct sock *) isk;
1366
1367 if (sk->sk_state == IUCV_CONNECTED)
1368 return EPOLLIN | EPOLLRDNORM;
1369 }
1370
1371 return 0;
1372 }
1373
1374 static __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1375 poll_table *wait)
1376 {
1377 struct sock *sk = sock->sk;
1378 __poll_t mask = 0;
1379
1380 sock_poll_wait(file, sock, wait);
1381
1382 if (sk->sk_state == IUCV_LISTEN)
1383 return iucv_accept_poll(sk);
1384
1385 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1386 mask |= EPOLLERR |
1387 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1388
1389 if (sk->sk_shutdown & RCV_SHUTDOWN)
1390 mask |= EPOLLRDHUP;
1391
1392 if (sk->sk_shutdown == SHUTDOWN_MASK)
1393 mask |= EPOLLHUP;
1394
1395 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1396 (sk->sk_shutdown & RCV_SHUTDOWN))
1397 mask |= EPOLLIN | EPOLLRDNORM;
1398
1399 if (sk->sk_state == IUCV_CLOSED)
1400 mask |= EPOLLHUP;
1401
1402 if (sk->sk_state == IUCV_DISCONN)
1403 mask |= EPOLLIN;
1404
1405 if (sock_writeable(sk) && iucv_below_msglim(sk))
1406 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1407 else
1408 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1409
1410 return mask;
1411 }
1412
1413 static int iucv_sock_shutdown(struct socket *sock, int how)
1414 {
1415 struct sock *sk = sock->sk;
1416 struct iucv_sock *iucv = iucv_sk(sk);
1417 struct iucv_message txmsg;
1418 int err = 0;
1419
1420 how++;
1421
1422 if ((how & ~SHUTDOWN_MASK) || !how)
1423 return -EINVAL;
1424
1425 lock_sock(sk);
1426 switch (sk->sk_state) {
1427 case IUCV_LISTEN:
1428 case IUCV_DISCONN:
1429 case IUCV_CLOSING:
1430 case IUCV_CLOSED:
1431 err = -ENOTCONN;
1432 goto fail;
1433 default:
1434 break;
1435 }
1436
1437 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) &&
1438 sk->sk_state == IUCV_CONNECTED) {
1439 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1440 txmsg.class = 0;
1441 txmsg.tag = 0;
1442 err = pr_iucv->message_send(iucv->path, &txmsg,
1443 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1444 if (err) {
1445 switch (err) {
1446 case 1:
1447 err = -ENOTCONN;
1448 break;
1449 case 2:
1450 err = -ECONNRESET;
1451 break;
1452 default:
1453 err = -ENOTCONN;
1454 break;
1455 }
1456 }
1457 } else
1458 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1459 }
1460
1461 sk->sk_shutdown |= how;
1462 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1463 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1464 iucv->path) {
1465 err = pr_iucv->path_quiesce(iucv->path, NULL);
1466 if (err)
1467 err = -ENOTCONN;
1468 /* skb_queue_purge(&sk->sk_receive_queue); */
1469 }
1470 skb_queue_purge(&sk->sk_receive_queue);
1471 }
1472
1473 /* Wake up anyone sleeping in poll */
1474 sk->sk_state_change(sk);
1475
1476 fail:
1477 release_sock(sk);
1478 return err;
1479 }
1480
1481 static int iucv_sock_release(struct socket *sock)
1482 {
1483 struct sock *sk = sock->sk;
1484 int err = 0;
1485
1486 if (!sk)
1487 return 0;
1488
1489 iucv_sock_close(sk);
1490
1491 sock_orphan(sk);
1492 iucv_sock_kill(sk);
1493 return err;
1494 }
1495
1496 /* getsockopt and setsockopt */
1497 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1498 sockptr_t optval, unsigned int optlen)
1499 {
1500 struct sock *sk = sock->sk;
1501 struct iucv_sock *iucv = iucv_sk(sk);
1502 int val;
1503 int rc;
1504
1505 if (level != SOL_IUCV)
1506 return -ENOPROTOOPT;
1507
1508 if (optlen < sizeof(int))
1509 return -EINVAL;
1510
1511 if (copy_from_sockptr(&val, optval, sizeof(int)))
1512 return -EFAULT;
1513
1514 rc = 0;
1515
1516 lock_sock(sk);
1517 switch (optname) {
1518 case SO_IPRMDATA_MSG:
1519 if (val)
1520 iucv->flags |= IUCV_IPRMDATA;
1521 else
1522 iucv->flags &= ~IUCV_IPRMDATA;
1523 break;
1524 case SO_MSGLIMIT:
1525 switch (sk->sk_state) {
1526 case IUCV_OPEN:
1527 case IUCV_BOUND:
1528 if (val < 1 || val > U16_MAX)
1529 rc = -EINVAL;
1530 else
1531 iucv->msglimit = val;
1532 break;
1533 default:
1534 rc = -EINVAL;
1535 break;
1536 }
1537 break;
1538 default:
1539 rc = -ENOPROTOOPT;
1540 break;
1541 }
1542 release_sock(sk);
1543
1544 return rc;
1545 }
1546
1547 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1548 char __user *optval, int __user *optlen)
1549 {
1550 struct sock *sk = sock->sk;
1551 struct iucv_sock *iucv = iucv_sk(sk);
1552 unsigned int val;
1553 int len;
1554
1555 if (level != SOL_IUCV)
1556 return -ENOPROTOOPT;
1557
1558 if (get_user(len, optlen))
1559 return -EFAULT;
1560
1561 if (len < 0)
1562 return -EINVAL;
1563
1564 len = min_t(unsigned int, len, sizeof(int));
1565
1566 switch (optname) {
1567 case SO_IPRMDATA_MSG:
1568 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1569 break;
1570 case SO_MSGLIMIT:
1571 lock_sock(sk);
1572 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1573 : iucv->msglimit; /* default */
1574 release_sock(sk);
1575 break;
1576 case SO_MSGSIZE:
1577 if (sk->sk_state == IUCV_OPEN)
1578 return -EBADFD;
1579 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1580 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1581 0x7fffffff;
1582 break;
1583 default:
1584 return -ENOPROTOOPT;
1585 }
1586
1587 if (put_user(len, optlen))
1588 return -EFAULT;
1589 if (copy_to_user(optval, &val, len))
1590 return -EFAULT;
1591
1592 return 0;
1593 }
1594
1595
1596 /* Callback wrappers - called from iucv base support */
1597 static int iucv_callback_connreq(struct iucv_path *path,
1598 u8 ipvmid[8], u8 ipuser[16])
1599 {
1600 unsigned char user_data[16];
1601 unsigned char nuser_data[16];
1602 unsigned char src_name[8];
1603 struct sock *sk, *nsk;
1604 struct iucv_sock *iucv, *niucv;
1605 int err;
1606
1607 memcpy(src_name, ipuser, 8);
1608 EBCASC(src_name, 8);
1609 /* Find out if this path belongs to af_iucv. */
1610 read_lock(&iucv_sk_list.lock);
1611 iucv = NULL;
1612 sk = NULL;
1613 sk_for_each(sk, &iucv_sk_list.head)
1614 if (sk->sk_state == IUCV_LISTEN &&
1615 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1616 /*
1617 * Found a listening socket with
1618 * src_name == ipuser[0-7].
1619 */
1620 iucv = iucv_sk(sk);
1621 break;
1622 }
1623 read_unlock(&iucv_sk_list.lock);
1624 if (!iucv)
1625 /* No socket found, not one of our paths. */
1626 return -EINVAL;
1627
1628 bh_lock_sock(sk);
1629
1630 /* Check if parent socket is listening */
1631 low_nmcpy(user_data, iucv->src_name);
1632 high_nmcpy(user_data, iucv->dst_name);
1633 ASCEBC(user_data, sizeof(user_data));
1634 if (sk->sk_state != IUCV_LISTEN) {
1635 err = pr_iucv->path_sever(path, user_data);
1636 iucv_path_free(path);
1637 goto fail;
1638 }
1639
1640 /* Check for backlog size */
1641 if (sk_acceptq_is_full(sk)) {
1642 err = pr_iucv->path_sever(path, user_data);
1643 iucv_path_free(path);
1644 goto fail;
1645 }
1646
1647 /* Create the new socket */
1648 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1649 if (!nsk) {
1650 err = pr_iucv->path_sever(path, user_data);
1651 iucv_path_free(path);
1652 goto fail;
1653 }
1654
1655 niucv = iucv_sk(nsk);
1656 iucv_sock_init(nsk, sk);
1657 niucv->transport = AF_IUCV_TRANS_IUCV;
1658 nsk->sk_allocation |= GFP_DMA;
1659
1660 /* Set the new iucv_sock */
1661 memcpy(niucv->dst_name, ipuser + 8, 8);
1662 EBCASC(niucv->dst_name, 8);
1663 memcpy(niucv->dst_user_id, ipvmid, 8);
1664 memcpy(niucv->src_name, iucv->src_name, 8);
1665 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1666 niucv->path = path;
1667
1668 /* Call iucv_accept */
1669 high_nmcpy(nuser_data, ipuser + 8);
1670 memcpy(nuser_data + 8, niucv->src_name, 8);
1671 ASCEBC(nuser_data + 8, 8);
1672
1673 /* set message limit for path based on msglimit of accepting socket */
1674 niucv->msglimit = iucv->msglimit;
1675 path->msglim = iucv->msglimit;
1676 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1677 if (err) {
1678 iucv_sever_path(nsk, 1);
1679 iucv_sock_kill(nsk);
1680 goto fail;
1681 }
1682
1683 iucv_accept_enqueue(sk, nsk);
1684
1685 /* Wake up accept */
1686 nsk->sk_state = IUCV_CONNECTED;
1687 sk->sk_data_ready(sk);
1688 err = 0;
1689 fail:
1690 bh_unlock_sock(sk);
1691 return 0;
1692 }
1693
1694 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1695 {
1696 struct sock *sk = path->private;
1697
1698 sk->sk_state = IUCV_CONNECTED;
1699 sk->sk_state_change(sk);
1700 }
1701
1702 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1703 {
1704 struct sock *sk = path->private;
1705 struct iucv_sock *iucv = iucv_sk(sk);
1706 struct sk_buff *skb;
1707 struct sock_msg_q *save_msg;
1708 int len;
1709
1710 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1711 pr_iucv->message_reject(path, msg);
1712 return;
1713 }
1714
1715 spin_lock(&iucv->message_q.lock);
1716
1717 if (!list_empty(&iucv->message_q.list) ||
1718 !skb_queue_empty(&iucv->backlog_skb_q))
1719 goto save_message;
1720
1721 len = atomic_read(&sk->sk_rmem_alloc);
1722 len += SKB_TRUESIZE(iucv_msg_length(msg));
1723 if (len > sk->sk_rcvbuf)
1724 goto save_message;
1725
1726 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1727 if (!skb)
1728 goto save_message;
1729
1730 iucv_process_message(sk, skb, path, msg);
1731 goto out_unlock;
1732
1733 save_message:
1734 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1735 if (!save_msg)
1736 goto out_unlock;
1737 save_msg->path = path;
1738 save_msg->msg = *msg;
1739
1740 list_add_tail(&save_msg->list, &iucv->message_q.list);
1741
1742 out_unlock:
1743 spin_unlock(&iucv->message_q.lock);
1744 }
1745
1746 static void iucv_callback_txdone(struct iucv_path *path,
1747 struct iucv_message *msg)
1748 {
1749 struct sock *sk = path->private;
1750 struct sk_buff *this = NULL;
1751 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1752 struct sk_buff *list_skb;
1753 unsigned long flags;
1754
1755 bh_lock_sock(sk);
1756
1757 spin_lock_irqsave(&list->lock, flags);
1758 skb_queue_walk(list, list_skb) {
1759 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1760 this = list_skb;
1761 break;
1762 }
1763 }
1764 if (this)
1765 __skb_unlink(this, list);
1766 spin_unlock_irqrestore(&list->lock, flags);
1767
1768 if (this) {
1769 kfree_skb(this);
1770 /* wake up any process waiting for sending */
1771 iucv_sock_wake_msglim(sk);
1772 }
1773
1774 if (sk->sk_state == IUCV_CLOSING) {
1775 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1776 sk->sk_state = IUCV_CLOSED;
1777 sk->sk_state_change(sk);
1778 }
1779 }
1780 bh_unlock_sock(sk);
1781
1782 }
1783
1784 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1785 {
1786 struct sock *sk = path->private;
1787
1788 if (sk->sk_state == IUCV_CLOSED)
1789 return;
1790
1791 bh_lock_sock(sk);
1792 iucv_sever_path(sk, 1);
1793 sk->sk_state = IUCV_DISCONN;
1794
1795 sk->sk_state_change(sk);
1796 bh_unlock_sock(sk);
1797 }
1798
1799 /* called if the other communication side shuts down its RECV direction;
1800 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1801 */
1802 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1803 {
1804 struct sock *sk = path->private;
1805
1806 bh_lock_sock(sk);
1807 if (sk->sk_state != IUCV_CLOSED) {
1808 sk->sk_shutdown |= SEND_SHUTDOWN;
1809 sk->sk_state_change(sk);
1810 }
1811 bh_unlock_sock(sk);
1812 }
1813
1814 /***************** HiperSockets transport callbacks ********************/
1815 static void afiucv_swap_src_dest(struct sk_buff *skb)
1816 {
1817 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1818 char tmpID[8];
1819 char tmpName[8];
1820
1821 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1822 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1823 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1824 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1825 memcpy(tmpID, trans_hdr->srcUserID, 8);
1826 memcpy(tmpName, trans_hdr->srcAppName, 8);
1827 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1828 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1829 memcpy(trans_hdr->destUserID, tmpID, 8);
1830 memcpy(trans_hdr->destAppName, tmpName, 8);
1831 skb_push(skb, ETH_HLEN);
1832 memset(skb->data, 0, ETH_HLEN);
1833 }
1834
1835 /**
1836 * afiucv_hs_callback_syn - react on received SYN
1837 **/
1838 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1839 {
1840 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1841 struct sock *nsk;
1842 struct iucv_sock *iucv, *niucv;
1843 int err;
1844
1845 iucv = iucv_sk(sk);
1846 if (!iucv) {
1847 /* no sock - connection refused */
1848 afiucv_swap_src_dest(skb);
1849 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1850 err = dev_queue_xmit(skb);
1851 goto out;
1852 }
1853
1854 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1855 bh_lock_sock(sk);
1856 if ((sk->sk_state != IUCV_LISTEN) ||
1857 sk_acceptq_is_full(sk) ||
1858 !nsk) {
1859 /* error on server socket - connection refused */
1860 afiucv_swap_src_dest(skb);
1861 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1862 err = dev_queue_xmit(skb);
1863 iucv_sock_kill(nsk);
1864 bh_unlock_sock(sk);
1865 goto out;
1866 }
1867
1868 niucv = iucv_sk(nsk);
1869 iucv_sock_init(nsk, sk);
1870 niucv->transport = AF_IUCV_TRANS_HIPER;
1871 niucv->msglimit = iucv->msglimit;
1872 if (!trans_hdr->window)
1873 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1874 else
1875 niucv->msglimit_peer = trans_hdr->window;
1876 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1877 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1878 memcpy(niucv->src_name, iucv->src_name, 8);
1879 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1880 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1881 niucv->hs_dev = iucv->hs_dev;
1882 dev_hold(niucv->hs_dev);
1883 afiucv_swap_src_dest(skb);
1884 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1885 trans_hdr->window = niucv->msglimit;
1886 /* if receiver acks the xmit connection is established */
1887 err = dev_queue_xmit(skb);
1888 if (!err) {
1889 iucv_accept_enqueue(sk, nsk);
1890 nsk->sk_state = IUCV_CONNECTED;
1891 sk->sk_data_ready(sk);
1892 } else
1893 iucv_sock_kill(nsk);
1894 bh_unlock_sock(sk);
1895
1896 out:
1897 return NET_RX_SUCCESS;
1898 }
1899
1900 /**
1901 * afiucv_hs_callback_synack() - react on received SYN-ACK
1902 **/
1903 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1904 {
1905 struct iucv_sock *iucv = iucv_sk(sk);
1906
1907 if (!iucv)
1908 goto out;
1909 if (sk->sk_state != IUCV_BOUND)
1910 goto out;
1911 bh_lock_sock(sk);
1912 iucv->msglimit_peer = iucv_trans_hdr(skb)->window;
1913 sk->sk_state = IUCV_CONNECTED;
1914 sk->sk_state_change(sk);
1915 bh_unlock_sock(sk);
1916 out:
1917 kfree_skb(skb);
1918 return NET_RX_SUCCESS;
1919 }
1920
1921 /**
1922 * afiucv_hs_callback_synfin() - react on received SYN_FIN
1923 **/
1924 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
1925 {
1926 struct iucv_sock *iucv = iucv_sk(sk);
1927
1928 if (!iucv)
1929 goto out;
1930 if (sk->sk_state != IUCV_BOUND)
1931 goto out;
1932 bh_lock_sock(sk);
1933 sk->sk_state = IUCV_DISCONN;
1934 sk->sk_state_change(sk);
1935 bh_unlock_sock(sk);
1936 out:
1937 kfree_skb(skb);
1938 return NET_RX_SUCCESS;
1939 }
1940
1941 /**
1942 * afiucv_hs_callback_fin() - react on received FIN
1943 **/
1944 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
1945 {
1946 struct iucv_sock *iucv = iucv_sk(sk);
1947
1948 /* other end of connection closed */
1949 if (!iucv)
1950 goto out;
1951 bh_lock_sock(sk);
1952 if (sk->sk_state == IUCV_CONNECTED) {
1953 sk->sk_state = IUCV_DISCONN;
1954 sk->sk_state_change(sk);
1955 }
1956 bh_unlock_sock(sk);
1957 out:
1958 kfree_skb(skb);
1959 return NET_RX_SUCCESS;
1960 }
1961
1962 /**
1963 * afiucv_hs_callback_win() - react on received WIN
1964 **/
1965 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
1966 {
1967 struct iucv_sock *iucv = iucv_sk(sk);
1968
1969 if (!iucv)
1970 return NET_RX_SUCCESS;
1971
1972 if (sk->sk_state != IUCV_CONNECTED)
1973 return NET_RX_SUCCESS;
1974
1975 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent);
1976 iucv_sock_wake_msglim(sk);
1977 return NET_RX_SUCCESS;
1978 }
1979
1980 /**
1981 * afiucv_hs_callback_rx() - react on received data
1982 **/
1983 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
1984 {
1985 struct iucv_sock *iucv = iucv_sk(sk);
1986
1987 if (!iucv) {
1988 kfree_skb(skb);
1989 return NET_RX_SUCCESS;
1990 }
1991
1992 if (sk->sk_state != IUCV_CONNECTED) {
1993 kfree_skb(skb);
1994 return NET_RX_SUCCESS;
1995 }
1996
1997 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1998 kfree_skb(skb);
1999 return NET_RX_SUCCESS;
2000 }
2001
2002 /* write stuff from iucv_msg to skb cb */
2003 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2004 skb_reset_transport_header(skb);
2005 skb_reset_network_header(skb);
2006 IUCV_SKB_CB(skb)->offset = 0;
2007 if (sk_filter(sk, skb)) {
2008 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2009 kfree_skb(skb);
2010 return NET_RX_SUCCESS;
2011 }
2012
2013 spin_lock(&iucv->message_q.lock);
2014 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2015 if (__sock_queue_rcv_skb(sk, skb))
2016 /* handle rcv queue full */
2017 skb_queue_tail(&iucv->backlog_skb_q, skb);
2018 } else
2019 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2020 spin_unlock(&iucv->message_q.lock);
2021 return NET_RX_SUCCESS;
2022 }
2023
2024 /**
2025 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2026 * transport
2027 * called from netif RX softirq
2028 **/
2029 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2030 struct packet_type *pt, struct net_device *orig_dev)
2031 {
2032 struct sock *sk;
2033 struct iucv_sock *iucv;
2034 struct af_iucv_trans_hdr *trans_hdr;
2035 int err = NET_RX_SUCCESS;
2036 char nullstring[8];
2037
2038 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) {
2039 WARN_ONCE(1, "AF_IUCV failed to receive skb, len=%u", skb->len);
2040 kfree_skb(skb);
2041 return NET_RX_SUCCESS;
2042 }
2043
2044 trans_hdr = iucv_trans_hdr(skb);
2045 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2046 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2047 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2048 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2049 memset(nullstring, 0, sizeof(nullstring));
2050 iucv = NULL;
2051 sk = NULL;
2052 read_lock(&iucv_sk_list.lock);
2053 sk_for_each(sk, &iucv_sk_list.head) {
2054 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2055 if ((!memcmp(&iucv_sk(sk)->src_name,
2056 trans_hdr->destAppName, 8)) &&
2057 (!memcmp(&iucv_sk(sk)->src_user_id,
2058 trans_hdr->destUserID, 8)) &&
2059 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2060 (!memcmp(&iucv_sk(sk)->dst_user_id,
2061 nullstring, 8))) {
2062 iucv = iucv_sk(sk);
2063 break;
2064 }
2065 } else {
2066 if ((!memcmp(&iucv_sk(sk)->src_name,
2067 trans_hdr->destAppName, 8)) &&
2068 (!memcmp(&iucv_sk(sk)->src_user_id,
2069 trans_hdr->destUserID, 8)) &&
2070 (!memcmp(&iucv_sk(sk)->dst_name,
2071 trans_hdr->srcAppName, 8)) &&
2072 (!memcmp(&iucv_sk(sk)->dst_user_id,
2073 trans_hdr->srcUserID, 8))) {
2074 iucv = iucv_sk(sk);
2075 break;
2076 }
2077 }
2078 }
2079 read_unlock(&iucv_sk_list.lock);
2080 if (!iucv)
2081 sk = NULL;
2082
2083 /* no sock
2084 how should we send with no sock
2085 1) send without sock no send rc checking?
2086 2) introduce default sock to handle this cases
2087
2088 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2089 data -> send FIN
2090 SYN|ACK, SYN|FIN, FIN -> no action? */
2091
2092 switch (trans_hdr->flags) {
2093 case AF_IUCV_FLAG_SYN:
2094 /* connect request */
2095 err = afiucv_hs_callback_syn(sk, skb);
2096 break;
2097 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2098 /* connect request confirmed */
2099 err = afiucv_hs_callback_synack(sk, skb);
2100 break;
2101 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2102 /* connect request refused */
2103 err = afiucv_hs_callback_synfin(sk, skb);
2104 break;
2105 case (AF_IUCV_FLAG_FIN):
2106 /* close request */
2107 err = afiucv_hs_callback_fin(sk, skb);
2108 break;
2109 case (AF_IUCV_FLAG_WIN):
2110 err = afiucv_hs_callback_win(sk, skb);
2111 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2112 kfree_skb(skb);
2113 break;
2114 }
2115 fallthrough; /* and receive non-zero length data */
2116 case (AF_IUCV_FLAG_SHT):
2117 /* shutdown request */
2118 fallthrough; /* and receive zero length data */
2119 case 0:
2120 /* plain data frame */
2121 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2122 err = afiucv_hs_callback_rx(sk, skb);
2123 break;
2124 default:
2125 kfree_skb(skb);
2126 }
2127
2128 return err;
2129 }
2130
2131 /**
2132 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2133 * transport
2134 **/
2135 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2136 enum iucv_tx_notify n)
2137 {
2138 struct sock *isk = skb->sk;
2139 struct sock *sk = NULL;
2140 struct iucv_sock *iucv = NULL;
2141 struct sk_buff_head *list;
2142 struct sk_buff *list_skb;
2143 struct sk_buff *nskb;
2144 unsigned long flags;
2145
2146 read_lock_irqsave(&iucv_sk_list.lock, flags);
2147 sk_for_each(sk, &iucv_sk_list.head)
2148 if (sk == isk) {
2149 iucv = iucv_sk(sk);
2150 break;
2151 }
2152 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2153
2154 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2155 return;
2156
2157 list = &iucv->send_skb_q;
2158 spin_lock_irqsave(&list->lock, flags);
2159 skb_queue_walk_safe(list, list_skb, nskb) {
2160 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2161 switch (n) {
2162 case TX_NOTIFY_OK:
2163 __skb_unlink(list_skb, list);
2164 kfree_skb(list_skb);
2165 iucv_sock_wake_msglim(sk);
2166 break;
2167 case TX_NOTIFY_PENDING:
2168 atomic_inc(&iucv->pendings);
2169 break;
2170 case TX_NOTIFY_DELAYED_OK:
2171 __skb_unlink(list_skb, list);
2172 atomic_dec(&iucv->pendings);
2173 if (atomic_read(&iucv->pendings) <= 0)
2174 iucv_sock_wake_msglim(sk);
2175 kfree_skb(list_skb);
2176 break;
2177 case TX_NOTIFY_UNREACHABLE:
2178 case TX_NOTIFY_DELAYED_UNREACHABLE:
2179 case TX_NOTIFY_TPQFULL: /* not yet used */
2180 case TX_NOTIFY_GENERALERROR:
2181 case TX_NOTIFY_DELAYED_GENERALERROR:
2182 __skb_unlink(list_skb, list);
2183 kfree_skb(list_skb);
2184 if (sk->sk_state == IUCV_CONNECTED) {
2185 sk->sk_state = IUCV_DISCONN;
2186 sk->sk_state_change(sk);
2187 }
2188 break;
2189 }
2190 break;
2191 }
2192 }
2193 spin_unlock_irqrestore(&list->lock, flags);
2194
2195 if (sk->sk_state == IUCV_CLOSING) {
2196 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2197 sk->sk_state = IUCV_CLOSED;
2198 sk->sk_state_change(sk);
2199 }
2200 }
2201
2202 }
2203
2204 /*
2205 * afiucv_netdev_event: handle netdev notifier chain events
2206 */
2207 static int afiucv_netdev_event(struct notifier_block *this,
2208 unsigned long event, void *ptr)
2209 {
2210 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2211 struct sock *sk;
2212 struct iucv_sock *iucv;
2213
2214 switch (event) {
2215 case NETDEV_REBOOT:
2216 case NETDEV_GOING_DOWN:
2217 sk_for_each(sk, &iucv_sk_list.head) {
2218 iucv = iucv_sk(sk);
2219 if ((iucv->hs_dev == event_dev) &&
2220 (sk->sk_state == IUCV_CONNECTED)) {
2221 if (event == NETDEV_GOING_DOWN)
2222 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2223 sk->sk_state = IUCV_DISCONN;
2224 sk->sk_state_change(sk);
2225 }
2226 }
2227 break;
2228 case NETDEV_DOWN:
2229 case NETDEV_UNREGISTER:
2230 default:
2231 break;
2232 }
2233 return NOTIFY_DONE;
2234 }
2235
2236 static struct notifier_block afiucv_netdev_notifier = {
2237 .notifier_call = afiucv_netdev_event,
2238 };
2239
2240 static const struct proto_ops iucv_sock_ops = {
2241 .family = PF_IUCV,
2242 .owner = THIS_MODULE,
2243 .release = iucv_sock_release,
2244 .bind = iucv_sock_bind,
2245 .connect = iucv_sock_connect,
2246 .listen = iucv_sock_listen,
2247 .accept = iucv_sock_accept,
2248 .getname = iucv_sock_getname,
2249 .sendmsg = iucv_sock_sendmsg,
2250 .recvmsg = iucv_sock_recvmsg,
2251 .poll = iucv_sock_poll,
2252 .ioctl = sock_no_ioctl,
2253 .mmap = sock_no_mmap,
2254 .socketpair = sock_no_socketpair,
2255 .shutdown = iucv_sock_shutdown,
2256 .setsockopt = iucv_sock_setsockopt,
2257 .getsockopt = iucv_sock_getsockopt,
2258 };
2259
2260 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
2261 int kern)
2262 {
2263 struct sock *sk;
2264
2265 if (protocol && protocol != PF_IUCV)
2266 return -EPROTONOSUPPORT;
2267
2268 sock->state = SS_UNCONNECTED;
2269
2270 switch (sock->type) {
2271 case SOCK_STREAM:
2272 case SOCK_SEQPACKET:
2273 /* currently, proto ops can handle both sk types */
2274 sock->ops = &iucv_sock_ops;
2275 break;
2276 default:
2277 return -ESOCKTNOSUPPORT;
2278 }
2279
2280 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
2281 if (!sk)
2282 return -ENOMEM;
2283
2284 iucv_sock_init(sk, NULL);
2285
2286 return 0;
2287 }
2288
2289 static const struct net_proto_family iucv_sock_family_ops = {
2290 .family = AF_IUCV,
2291 .owner = THIS_MODULE,
2292 .create = iucv_sock_create,
2293 };
2294
2295 static struct packet_type iucv_packet_type = {
2296 .type = cpu_to_be16(ETH_P_AF_IUCV),
2297 .func = afiucv_hs_rcv,
2298 };
2299
2300 static int afiucv_iucv_init(void)
2301 {
2302 return pr_iucv->iucv_register(&af_iucv_handler, 0);
2303 }
2304
2305 static void afiucv_iucv_exit(void)
2306 {
2307 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2308 }
2309
2310 static int __init afiucv_init(void)
2311 {
2312 int err;
2313
2314 if (MACHINE_IS_VM) {
2315 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2316 if (unlikely(err)) {
2317 WARN_ON(err);
2318 err = -EPROTONOSUPPORT;
2319 goto out;
2320 }
2321
2322 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2323 if (!pr_iucv) {
2324 printk(KERN_WARNING "iucv_if lookup failed\n");
2325 memset(&iucv_userid, 0, sizeof(iucv_userid));
2326 }
2327 } else {
2328 memset(&iucv_userid, 0, sizeof(iucv_userid));
2329 pr_iucv = NULL;
2330 }
2331
2332 err = proto_register(&iucv_proto, 0);
2333 if (err)
2334 goto out;
2335 err = sock_register(&iucv_sock_family_ops);
2336 if (err)
2337 goto out_proto;
2338
2339 if (pr_iucv) {
2340 err = afiucv_iucv_init();
2341 if (err)
2342 goto out_sock;
2343 }
2344
2345 err = register_netdevice_notifier(&afiucv_netdev_notifier);
2346 if (err)
2347 goto out_notifier;
2348
2349 dev_add_pack(&iucv_packet_type);
2350 return 0;
2351
2352 out_notifier:
2353 if (pr_iucv)
2354 afiucv_iucv_exit();
2355 out_sock:
2356 sock_unregister(PF_IUCV);
2357 out_proto:
2358 proto_unregister(&iucv_proto);
2359 out:
2360 if (pr_iucv)
2361 symbol_put(iucv_if);
2362 return err;
2363 }
2364
2365 static void __exit afiucv_exit(void)
2366 {
2367 if (pr_iucv) {
2368 afiucv_iucv_exit();
2369 symbol_put(iucv_if);
2370 }
2371
2372 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2373 dev_remove_pack(&iucv_packet_type);
2374 sock_unregister(PF_IUCV);
2375 proto_unregister(&iucv_proto);
2376 }
2377
2378 module_init(afiucv_init);
2379 module_exit(afiucv_exit);
2380
2381 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2382 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2383 MODULE_VERSION(VERSION);
2384 MODULE_LICENSE("GPL");
2385 MODULE_ALIAS_NETPROTO(PF_IUCV);
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