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Merge tag 'xfs-4.18-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
[mirror_ubuntu-hirsute-kernel.git] / net / iucv / af_iucv.c
CommitLineData
eac3731b 1/*
eac3731b
JH		 2 * IUCV protocol stack for Linux on zSeries
3 *
c23cad92 4 * Copyright IBM Corp. 2006, 2009
eac3731b
JH		 5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
c23cad92
UB		 7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
eac3731b
JH		 10 */
11
8f7c502c
UB		 12#define KMSG_COMPONENT "af_iucv"
13#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
eac3731b
JH		 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>
174cd4b1 20#include <linux/sched/signal.h>
eac3731b
JH		 21#include <linux/slab.h>
22#include <linux/skbuff.h>
23#include <linux/init.h>
24#include <linux/poll.h>
02f06918 25#include <linux/security.h>
eac3731b
JH		 26#include <net/sock.h>
27#include <asm/ebcdic.h>
28#include <asm/cpcmd.h>
29#include <linux/kmod.h>
30
eac3731b
JH		 31#include <net/iucv/af_iucv.h>
32
3881ac44 33#define VERSION "1.2"
eac3731b
JH		 34
35static char iucv_userid[80];
36
5708e868 37static const struct proto_ops iucv_sock_ops;
eac3731b
JH		 38
39static struct proto iucv_proto = {
40 .name = "AF_IUCV",
41 .owner = THIS_MODULE,
42 .obj_size = sizeof(struct iucv_sock),
43};
44
6fcd61f7
FB		 45static struct iucv_interface *pr_iucv;
46
b8942e3b
HB		 47/* special AF_IUCV IPRM messages */
48static const u8 iprm_shutdown[8] =
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
50
44b1e6b5
HB		 51#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
52
0ea920d2
HB		 53#define __iucv_sock_wait(sk, condition, timeo, ret) \
54do { \
55 DEFINE_WAIT(__wait); \
56 long __timeo = timeo; \
57 ret = 0; \
aa395145 58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
0ea920d2 59 while (!(condition)) { \
0ea920d2
HB		 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 } \
aa395145 75 finish_wait(sk_sleep(sk), &__wait); \
0ea920d2
HB		 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})
44b1e6b5 85
57f20448
HC		 86static void iucv_sock_kill(struct sock *sk);
87static void iucv_sock_close(struct sock *sk);
7d316b94 88static void iucv_sever_path(struct sock *, int);
57f20448 89
3881ac44
UB		 90static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
91 struct packet_type *pt, struct net_device *orig_dev);
92static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
93 struct sk_buff *skb, u8 flags);
94static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
95
eac3731b
JH		 96/* Call Back functions */
97static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
98static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
91e60eb6
UB		 99static void iucv_callback_connack(struct iucv_path *, u8 *);
100static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101static void iucv_callback_connrej(struct iucv_path *, u8 *);
102static void iucv_callback_shutdown(struct iucv_path *, u8 *);
eac3731b
JH		 103
104static struct iucv_sock_list iucv_sk_list = {
3db8ce35 105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
eac3731b
JH		 106 .autobind_name = ATOMIC_INIT(0)
107};
108
109static 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,
af88b52d
HB		 114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
eac3731b
JH		 116};
117
118static inline void high_nmcpy(unsigned char *dst, char *src)
119{
120 memcpy(dst, src, 8);
121}
122
123static inline void low_nmcpy(unsigned char *dst, char *src)
124{
125 memcpy(&dst[8], src, 8);
126}
127
c23cad92
UB		 128static 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
136static void afiucv_pm_complete(struct device *dev)
137{
138#ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140#endif
c23cad92
UB		 141}
142
143/**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149static int afiucv_pm_freeze(struct device *dev)
150{
151 struct iucv_sock *iucv;
152 struct sock *sk;
c23cad92
UB		 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);
b67bfe0d 159 sk_for_each(sk, &iucv_sk_list.head) {
c23cad92 160 iucv = iucv_sk(sk);
c23cad92 161 switch (sk->sk_state) {
c23cad92
UB		 162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
7d316b94 165 iucv_sever_path(sk, 0);
c23cad92
UB		 166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
7d316b94
UB		 174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
c23cad92
UB		 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 */
187static int afiucv_pm_restore_thaw(struct device *dev)
188{
c23cad92 189 struct sock *sk;
c23cad92
UB		 190
191#ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193#endif
194 read_lock(&iucv_sk_list.lock);
b67bfe0d 195 sk_for_each(sk, &iucv_sk_list.head) {
c23cad92
UB		 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:
c23cad92
UB		 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
47145210 215static const struct dev_pm_ops afiucv_pm_ops = {
c23cad92
UB		 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
223static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
6fcd61f7 226 .bus = NULL,
c23cad92
UB		 227 .pm = &afiucv_pm_ops,
228};
229
230/* dummy device used as trigger for PM functions */
231static struct device *af_iucv_dev;
232
b8942e3b
HB		 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 *
25985edc 245 * The socket data length is computed by subtracting the socket data length
b8942e3b
HB		 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 */
253static 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
0ea920d2
HB		 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 */
272static 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 */
285static 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;
3881ac44
UB		 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));
0ea920d2
HB		 296}
297
298/**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301static void iucv_sock_wake_msglim(struct sock *sk)
302{
43815482
ED		 303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 307 if (skwq_has_sleeper(wq))
43815482 308 wake_up_interruptible_all(&wq->wait);
0ea920d2 309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
43815482 310 rcu_read_unlock();
0ea920d2
HB		 311}
312
3881ac44
UB		 313/**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318{
3881ac44
UB		 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);
d58ff351 325 phs_hdr = skb_push(skb, sizeof(struct af_iucv_trans_hdr));
3881ac44
UB		 326 skb_reset_mac_header(skb);
327 skb_reset_network_header(skb);
328 skb_push(skb, ETH_HLEN);
329 skb_reset_mac_header(skb);
330 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
331
332 phs_hdr->magic = ETH_P_AF_IUCV;
333 phs_hdr->version = 1;
334 phs_hdr->flags = flags;
335 if (flags == AF_IUCV_FLAG_SYN)
336 phs_hdr->window = iucv->msglimit;
337 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
338 confirm_recv = atomic_read(&iucv->msg_recv);
339 phs_hdr->window = confirm_recv;
340 if (confirm_recv)
341 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
342 }
343 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
344 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
345 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
346 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
347 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
348 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
349 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
350 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
351 if (imsg)
352 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
353
800c5eb7 354 skb->dev = iucv->hs_dev;
3881ac44
UB		 355 if (!skb->dev)
356 return -ENODEV;
800c5eb7 357 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
3881ac44
UB		 358 return -ENETDOWN;
359 if (skb->len > skb->dev->mtu) {
360 if (sock->sk_type == SOCK_SEQPACKET)
361 return -EMSGSIZE;
362 else
363 skb_trim(skb, skb->dev->mtu);
364 }
2e56c26b 365 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
3881ac44
UB		 366 nskb = skb_clone(skb, GFP_ATOMIC);
367 if (!nskb)
368 return -ENOMEM;
369 skb_queue_tail(&iucv->send_skb_q, nskb);
370 err = dev_queue_xmit(skb);
800c5eb7 371 if (net_xmit_eval(err)) {
3881ac44
UB		 372 skb_unlink(nskb, &iucv->send_skb_q);
373 kfree_skb(nskb);
374 } else {
375 atomic_sub(confirm_recv, &iucv->msg_recv);
376 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
377 }
800c5eb7 378 return net_xmit_eval(err);
3881ac44
UB		 379}
380
eac3731b
JH		 381static struct sock *__iucv_get_sock_by_name(char *nm)
382{
383 struct sock *sk;
eac3731b 384
b67bfe0d 385 sk_for_each(sk, &iucv_sk_list.head)
eac3731b
JH		 386 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
387 return sk;
388
389 return NULL;
390}
391
392static void iucv_sock_destruct(struct sock *sk)
393{
394 skb_queue_purge(&sk->sk_receive_queue);
82492a35
UB		 395 skb_queue_purge(&sk->sk_error_queue);
396
397 sk_mem_reclaim(sk);
398
399 if (!sock_flag(sk, SOCK_DEAD)) {
400 pr_err("Attempt to release alive iucv socket %p\n", sk);
401 return;
402 }
403
404 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
b2c9c5df 405 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
82492a35
UB		 406 WARN_ON(sk->sk_wmem_queued);
407 WARN_ON(sk->sk_forward_alloc);
eac3731b
JH		 408}
409
410/* Cleanup Listen */
411static void iucv_sock_cleanup_listen(struct sock *parent)
412{
413 struct sock *sk;
414
415 /* Close non-accepted connections */
416 while ((sk = iucv_accept_dequeue(parent, NULL))) {
417 iucv_sock_close(sk);
418 iucv_sock_kill(sk);
419 }
420
421 parent->sk_state = IUCV_CLOSED;
eac3731b
JH		 422}
423
7514bab0 424/* Kill socket (only if zapped and orphaned) */
eac3731b
JH		 425static void iucv_sock_kill(struct sock *sk)
426{
427 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
428 return;
429
430 iucv_sock_unlink(&iucv_sk_list, sk);
431 sock_set_flag(sk, SOCK_DEAD);
432 sock_put(sk);
433}
434
7d316b94
UB		 435/* Terminate an IUCV path */
436static void iucv_sever_path(struct sock *sk, int with_user_data)
437{
438 unsigned char user_data[16];
439 struct iucv_sock *iucv = iucv_sk(sk);
440 struct iucv_path *path = iucv->path;
441
442 if (iucv->path) {
443 iucv->path = NULL;
444 if (with_user_data) {
445 low_nmcpy(user_data, iucv->src_name);
446 high_nmcpy(user_data, iucv->dst_name);
447 ASCEBC(user_data, sizeof(user_data));
448 pr_iucv->path_sever(path, user_data);
449 } else
450 pr_iucv->path_sever(path, NULL);
451 iucv_path_free(path);
452 }
453}
454
4e0ad322 455/* Send controlling flags through an IUCV socket for HIPER transport */
9fbd87d4
UB		 456static int iucv_send_ctrl(struct sock *sk, u8 flags)
457{
458 int err = 0;
459 int blen;
460 struct sk_buff *skb;
4e0ad322 461 u8 shutdown = 0;
9fbd87d4
UB		 462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
4e0ad322
UB		 464 if (sk->sk_shutdown & SEND_SHUTDOWN) {
465 /* controlling flags should be sent anyway */
466 shutdown = sk->sk_shutdown;
467 sk->sk_shutdown &= RCV_SHUTDOWN;
468 }
9fbd87d4
UB		 469 skb = sock_alloc_send_skb(sk, blen, 1, &err);
470 if (skb) {
471 skb_reserve(skb, blen);
472 err = afiucv_hs_send(NULL, sk, skb, flags);
473 }
4e0ad322
UB		 474 if (shutdown)
475 sk->sk_shutdown = shutdown;
9fbd87d4
UB		 476 return err;
477}
478
eac3731b
JH		 479/* Close an IUCV socket */
480static void iucv_sock_close(struct sock *sk)
481{
eac3731b 482 struct iucv_sock *iucv = iucv_sk(sk);
561e0360 483 unsigned long timeo;
800c5eb7 484 int err = 0;
eac3731b 485
eac3731b
JH		 486 lock_sock(sk);
487
da99f056 488 switch (sk->sk_state) {
eac3731b
JH		 489 case IUCV_LISTEN:
490 iucv_sock_cleanup_listen(sk);
491 break;
492
493 case IUCV_CONNECTED:
3881ac44 494 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
9fbd87d4 495 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
3881ac44
UB		 496 sk->sk_state = IUCV_DISCONN;
497 sk->sk_state_change(sk);
498 }
816abbad 499 case IUCV_DISCONN: /* fall through */
561e0360
JH		 500 sk->sk_state = IUCV_CLOSING;
501 sk->sk_state_change(sk);
502
800c5eb7 503 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
561e0360
JH		 504 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
505 timeo = sk->sk_lingertime;
506 else
507 timeo = IUCV_DISCONN_TIMEOUT;
9f6298a6 508 iucv_sock_wait(sk,
0ea920d2
HB		 509 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
510 timeo);
561e0360
JH		 511 }
512
bbe188c8 513 case IUCV_CLOSING: /* fall through */
561e0360
JH		 514 sk->sk_state = IUCV_CLOSED;
515 sk->sk_state_change(sk);
516
eac3731b
JH		 517 sk->sk_err = ECONNRESET;
518 sk->sk_state_change(sk);
519
800c5eb7 520 skb_queue_purge(&iucv->send_skb_q);
561e0360 521 skb_queue_purge(&iucv->backlog_skb_q);
eac3731b 522
7d316b94
UB		 523 default: /* fall through */
524 iucv_sever_path(sk, 1);
3ff50b79 525 }
eac3731b 526
800c5eb7
UB		 527 if (iucv->hs_dev) {
528 dev_put(iucv->hs_dev);
529 iucv->hs_dev = NULL;
530 sk->sk_bound_dev_if = 0;
531 }
532
7514bab0
HB		 533 /* mark socket for deletion by iucv_sock_kill() */
534 sock_set_flag(sk, SOCK_ZAPPED);
535
eac3731b 536 release_sock(sk);
eac3731b
JH		 537}
538
539static void iucv_sock_init(struct sock *sk, struct sock *parent)
540{
02f06918 541 if (parent) {
eac3731b 542 sk->sk_type = parent->sk_type;
02f06918
PM		 543 security_sk_clone(parent, sk);
544 }
eac3731b
JH		 545}
546
11aa9c28 547static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
eac3731b
JH		 548{
549 struct sock *sk;
493d3971 550 struct iucv_sock *iucv;
eac3731b 551
11aa9c28 552 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
eac3731b
JH		 553 if (!sk)
554 return NULL;
493d3971 555 iucv = iucv_sk(sk);
eac3731b
JH		 556
557 sock_init_data(sock, sk);
493d3971
UB		 558 INIT_LIST_HEAD(&iucv->accept_q);
559 spin_lock_init(&iucv->accept_q_lock);
560 skb_queue_head_init(&iucv->send_skb_q);
561 INIT_LIST_HEAD(&iucv->message_q.list);
562 spin_lock_init(&iucv->message_q.lock);
563 skb_queue_head_init(&iucv->backlog_skb_q);
564 iucv->send_tag = 0;
3881ac44 565 atomic_set(&iucv->pendings, 0);
493d3971 566 iucv->flags = 0;
3881ac44
UB		 567 iucv->msglimit = 0;
568 atomic_set(&iucv->msg_sent, 0);
569 atomic_set(&iucv->msg_recv, 0);
493d3971 570 iucv->path = NULL;
3881ac44 571 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
493d3971 572 memset(&iucv->src_user_id , 0, 32);
3881ac44
UB		 573 if (pr_iucv)
574 iucv->transport = AF_IUCV_TRANS_IUCV;
575 else
576 iucv->transport = AF_IUCV_TRANS_HIPER;
eac3731b
JH		 577
578 sk->sk_destruct = iucv_sock_destruct;
579 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
580 sk->sk_allocation = GFP_DMA;
581
582 sock_reset_flag(sk, SOCK_ZAPPED);
583
584 sk->sk_protocol = proto;
585 sk->sk_state = IUCV_OPEN;
586
eac3731b
JH		 587 iucv_sock_link(&iucv_sk_list, sk);
588 return sk;
589}
590
591/* Create an IUCV socket */
3f378b68
EP		 592static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
593 int kern)
eac3731b
JH		 594{
595 struct sock *sk;
596
aa8e71f5
HB		 597 if (protocol && protocol != PF_IUCV)
598 return -EPROTONOSUPPORT;
eac3731b
JH		 599
600 sock->state = SS_UNCONNECTED;
aa8e71f5
HB		 601
602 switch (sock->type) {
603 case SOCK_STREAM:
604 sock->ops = &iucv_sock_ops;
605 break;
606 case SOCK_SEQPACKET:
607 /* currently, proto ops can handle both sk types */
608 sock->ops = &iucv_sock_ops;
609 break;
610 default:
611 return -ESOCKTNOSUPPORT;
612 }
eac3731b 613
11aa9c28 614 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
eac3731b
JH		 615 if (!sk)
616 return -ENOMEM;
617
618 iucv_sock_init(sk, NULL);
619
620 return 0;
621}
622
623void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
624{
625 write_lock_bh(&l->lock);
626 sk_add_node(sk, &l->head);
627 write_unlock_bh(&l->lock);
628}
629
630void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
631{
632 write_lock_bh(&l->lock);
633 sk_del_node_init(sk);
634 write_unlock_bh(&l->lock);
635}
636
637void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
638{
febca281
UB		 639 unsigned long flags;
640 struct iucv_sock *par = iucv_sk(parent);
641
eac3731b 642 sock_hold(sk);
febca281
UB		 643 spin_lock_irqsave(&par->accept_q_lock, flags);
644 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
645 spin_unlock_irqrestore(&par->accept_q_lock, flags);
eac3731b 646 iucv_sk(sk)->parent = parent;
49f5eba7 647 sk_acceptq_added(parent);
eac3731b
JH		 648}
649
650void iucv_accept_unlink(struct sock *sk)
651{
febca281
UB		 652 unsigned long flags;
653 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
654
655 spin_lock_irqsave(&par->accept_q_lock, flags);
eac3731b 656 list_del_init(&iucv_sk(sk)->accept_q);
febca281 657 spin_unlock_irqrestore(&par->accept_q_lock, flags);
49f5eba7 658 sk_acceptq_removed(iucv_sk(sk)->parent);
eac3731b
JH		 659 iucv_sk(sk)->parent = NULL;
660 sock_put(sk);
661}
662
663struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
664{
665 struct iucv_sock *isk, *n;
666 struct sock *sk;
667
da99f056 668 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
eac3731b
JH		 669 sk = (struct sock *) isk;
670 lock_sock(sk);
671
672 if (sk->sk_state == IUCV_CLOSED) {
eac3731b 673 iucv_accept_unlink(sk);
febca281 674 release_sock(sk);
eac3731b
JH		 675 continue;
676 }
677
678 if (sk->sk_state == IUCV_CONNECTED ||
aac6399c 679 sk->sk_state == IUCV_DISCONN ||
eac3731b
JH		 680 !newsock) {
681 iucv_accept_unlink(sk);
682 if (newsock)
683 sock_graft(sk, newsock);
684
eac3731b
JH		 685 release_sock(sk);
686 return sk;
687 }
688
689 release_sock(sk);
690 }
691 return NULL;
692}
693
53a4b499
PH		 694static void __iucv_auto_name(struct iucv_sock *iucv)
695{
696 char name[12];
697
698 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
699 while (__iucv_get_sock_by_name(name)) {
700 sprintf(name, "%08x",
701 atomic_inc_return(&iucv_sk_list.autobind_name));
702 }
703 memcpy(iucv->src_name, name, 8);
704}
705
eac3731b
JH		 706/* Bind an unbound socket */
707static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
708 int addr_len)
709{
710 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
711 struct sock *sk = sock->sk;
712 struct iucv_sock *iucv;
3881ac44
UB		 713 int err = 0;
714 struct net_device *dev;
715 char uid[9];
eac3731b
JH		 716
717 /* Verify the input sockaddr */
e3c42b61
MJ		 718 if (addr_len < sizeof(struct sockaddr_iucv) ||
719 addr->sa_family != AF_IUCV)
52a82e23
UB		 720 return -EINVAL;
721
eac3731b
JH		 722 lock_sock(sk);
723 if (sk->sk_state != IUCV_OPEN) {
724 err = -EBADFD;
725 goto done;
726 }
727
728 write_lock_bh(&iucv_sk_list.lock);
729
730 iucv = iucv_sk(sk);
731 if (__iucv_get_sock_by_name(sa->siucv_name)) {
732 err = -EADDRINUSE;
733 goto done_unlock;
734 }
3881ac44 735 if (iucv->path)
eac3731b 736 goto done_unlock;
eac3731b
JH		 737
738 /* Bind the socket */
3881ac44
UB		 739 if (pr_iucv)
740 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
741 goto vm_bind; /* VM IUCV transport */
eac3731b 742
3881ac44
UB		 743 /* try hiper transport */
744 memcpy(uid, sa->siucv_user_id, sizeof(uid));
745 ASCEBC(uid, 8);
746 rcu_read_lock();
747 for_each_netdev_rcu(&init_net, dev) {
748 if (!memcmp(dev->perm_addr, uid, 8)) {
3881ac44 749 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
53a4b499
PH		 750 /* Check for unitialized siucv_name */
751 if (strncmp(sa->siucv_name, " ", 8) == 0)
752 __iucv_auto_name(iucv);
753 else
754 memcpy(iucv->src_name, sa->siucv_name, 8);
816abbad 755 sk->sk_bound_dev_if = dev->ifindex;
800c5eb7
UB		 756 iucv->hs_dev = dev;
757 dev_hold(dev);
3881ac44
UB		 758 sk->sk_state = IUCV_BOUND;
759 iucv->transport = AF_IUCV_TRANS_HIPER;
760 if (!iucv->msglimit)
761 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
762 rcu_read_unlock();
763 goto done_unlock;
764 }
765 }
766 rcu_read_unlock();
767vm_bind:
768 if (pr_iucv) {
769 /* use local userid for backward compat */
770 memcpy(iucv->src_name, sa->siucv_name, 8);
771 memcpy(iucv->src_user_id, iucv_userid, 8);
772 sk->sk_state = IUCV_BOUND;
773 iucv->transport = AF_IUCV_TRANS_IUCV;
774 if (!iucv->msglimit)
775 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
776 goto done_unlock;
777 }
778 /* found no dev to bind */
779 err = -ENODEV;
eac3731b
JH		 780done_unlock:
781 /* Release the socket list lock */
782 write_unlock_bh(&iucv_sk_list.lock);
783done:
784 release_sock(sk);
785 return err;
786}
787
788/* Automatically bind an unbound socket */
789static int iucv_sock_autobind(struct sock *sk)
790{
791 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 792 int err = 0;
793
aac6399c 794 if (unlikely(!pr_iucv))
eac3731b
JH		 795 return -EPROTO;
796
aac6399c 797 memcpy(iucv->src_user_id, iucv_userid, 8);
eac3731b
JH		 798
799 write_lock_bh(&iucv_sk_list.lock);
53a4b499 800 __iucv_auto_name(iucv);
eac3731b
JH		 801 write_unlock_bh(&iucv_sk_list.lock);
802
3881ac44
UB		 803 if (!iucv->msglimit)
804 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
805
eac3731b
JH		 806 return err;
807}
808
3881ac44 809static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
eac3731b
JH		 810{
811 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
812 struct sock *sk = sock->sk;
493d3971 813 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 814 unsigned char user_data[16];
815 int err;
816
eac3731b 817 high_nmcpy(user_data, sa->siucv_name);
493d3971 818 low_nmcpy(user_data, iucv->src_name);
eac3731b
JH		 819 ASCEBC(user_data, sizeof(user_data));
820
eac3731b 821 /* Create path. */
09488e2e 822 iucv->path = iucv_path_alloc(iucv->msglimit,
b8942e3b 823 IUCV_IPRMDATA, GFP_KERNEL);
d4444722
UB		 824 if (!iucv->path) {
825 err = -ENOMEM;
826 goto done;
827 }
6fcd61f7
FB		 828 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
829 sa->siucv_user_id, NULL, user_data,
830 sk);
eac3731b
JH		 831 if (err) {
832 iucv_path_free(iucv->path);
833 iucv->path = NULL;
55cdea9e
HB		 834 switch (err) {
835 case 0x0b: /* Target communicator is not logged on */
836 err = -ENETUNREACH;
837 break;
838 case 0x0d: /* Max connections for this guest exceeded */
839 case 0x0e: /* Max connections for target guest exceeded */
840 err = -EAGAIN;
841 break;
842 case 0x0f: /* Missing IUCV authorization */
843 err = -EACCES;
844 break;
845 default:
846 err = -ECONNREFUSED;
847 break;
848 }
eac3731b 849 }
3881ac44
UB		 850done:
851 return err;
852}
eac3731b 853
3881ac44
UB		 854/* Connect an unconnected socket */
855static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
856 int alen, int flags)
857{
858 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
859 struct sock *sk = sock->sk;
860 struct iucv_sock *iucv = iucv_sk(sk);
861 int err;
862
e3c42b61 863 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
3881ac44
UB		 864 return -EINVAL;
865
866 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
867 return -EBADFD;
868
869 if (sk->sk_state == IUCV_OPEN &&
870 iucv->transport == AF_IUCV_TRANS_HIPER)
871 return -EBADFD; /* explicit bind required */
872
873 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
874 return -EINVAL;
875
876 if (sk->sk_state == IUCV_OPEN) {
877 err = iucv_sock_autobind(sk);
878 if (unlikely(err))
879 return err;
880 }
881
882 lock_sock(sk);
883
884 /* Set the destination information */
885 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
886 memcpy(iucv->dst_name, sa->siucv_name, 8);
887
888 if (iucv->transport == AF_IUCV_TRANS_HIPER)
9fbd87d4 889 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
3881ac44
UB		 890 else
891 err = afiucv_path_connect(sock, addr);
892 if (err)
893 goto done;
894
895 if (sk->sk_state != IUCV_CONNECTED)
0ea920d2
HB		 896 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
897 IUCV_DISCONN),
898 sock_sndtimeo(sk, flags & O_NONBLOCK));
eac3731b 899
3881ac44 900 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
b8942e3b 901 err = -ECONNREFUSED;
18becbc5 902
7d316b94
UB		 903 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
904 iucv_sever_path(sk, 0);
18becbc5 905
eac3731b
JH		 906done:
907 release_sock(sk);
908 return err;
909}
910
911/* Move a socket into listening state. */
912static int iucv_sock_listen(struct socket *sock, int backlog)
913{
914 struct sock *sk = sock->sk;
915 int err;
916
917 lock_sock(sk);
918
919 err = -EINVAL;
aa8e71f5
HB		 920 if (sk->sk_state != IUCV_BOUND)
921 goto done;
922
923 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
eac3731b
JH		 924 goto done;
925
926 sk->sk_max_ack_backlog = backlog;
927 sk->sk_ack_backlog = 0;
928 sk->sk_state = IUCV_LISTEN;
929 err = 0;
930
931done:
932 release_sock(sk);
933 return err;
934}
935
936/* Accept a pending connection */
937static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
cdfbabfb 938 int flags, bool kern)
eac3731b
JH		 939{
940 DECLARE_WAITQUEUE(wait, current);
941 struct sock *sk = sock->sk, *nsk;
942 long timeo;
943 int err = 0;
944
561e0360 945 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
eac3731b
JH		 946
947 if (sk->sk_state != IUCV_LISTEN) {
948 err = -EBADFD;
949 goto done;
950 }
951
952 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
953
954 /* Wait for an incoming connection */
aa395145 955 add_wait_queue_exclusive(sk_sleep(sk), &wait);
da99f056 956 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
eac3731b
JH		 957 set_current_state(TASK_INTERRUPTIBLE);
958 if (!timeo) {
959 err = -EAGAIN;
960 break;
961 }
962
963 release_sock(sk);
964 timeo = schedule_timeout(timeo);
561e0360 965 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
eac3731b
JH		 966
967 if (sk->sk_state != IUCV_LISTEN) {
968 err = -EBADFD;
969 break;
970 }
971
972 if (signal_pending(current)) {
973 err = sock_intr_errno(timeo);
974 break;
975 }
976 }
977
978 set_current_state(TASK_RUNNING);
aa395145 979 remove_wait_queue(sk_sleep(sk), &wait);
eac3731b
JH		 980
981 if (err)
982 goto done;
983
984 newsock->state = SS_CONNECTED;
985
986done:
987 release_sock(sk);
988 return err;
989}
990
991static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
9b2c45d4 992 int peer)
eac3731b
JH		 993{
994 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
995 struct sock *sk = sock->sk;
493d3971 996 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 997
998 addr->sa_family = AF_IUCV;
eac3731b
JH		 999
1000 if (peer) {
493d3971
UB		 1001 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1002 memcpy(siucv->siucv_name, iucv->dst_name, 8);
eac3731b 1003 } else {
493d3971
UB		 1004 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1005 memcpy(siucv->siucv_name, iucv->src_name, 8);
eac3731b
JH		 1006 }
1007 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1008 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
493d3971 1009 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
eac3731b 1010
9b2c45d4 1011 return sizeof(struct sockaddr_iucv);
eac3731b
JH		 1012}
1013
b8942e3b
HB		 1014/**
1015 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1016 * @path: IUCV path
1017 * @msg: Pointer to a struct iucv_message
1018 * @skb: The socket data to send, skb->len MUST BE <= 7
1019 *
1020 * Send the socket data in the parameter list in the iucv message
1021 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1022 * list and the socket data len at index 7 (last byte).
1023 * See also iucv_msg_length().
1024 *
1025 * Returns the error code from the iucv_message_send() call.
1026 */
1027static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1028 struct sk_buff *skb)
1029{
1030 u8 prmdata[8];
1031
1032 memcpy(prmdata, (void *) skb->data, skb->len);
1033 prmdata[7] = 0xff - (u8) skb->len;
6fcd61f7 1034 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
b8942e3b
HB		 1035 (void *) prmdata, 8);
1036}
1037
1b784140
YX		 1038static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1039 size_t len)
eac3731b
JH		 1040{
1041 struct sock *sk = sock->sk;
1042 struct iucv_sock *iucv = iucv_sk(sk);
dc5367bc
JW		 1043 size_t headroom = 0;
1044 size_t linear;
eac3731b 1045 struct sk_buff *skb;
0506eb01 1046 struct iucv_message txmsg = {0};
44b1e6b5
HB		 1047 struct cmsghdr *cmsg;
1048 int cmsg_done;
0ea920d2 1049 long timeo;
8f7c502c
UB		 1050 char user_id[9];
1051 char appl_id[9];
eac3731b 1052 int err;
0ea920d2 1053 int noblock = msg->msg_flags & MSG_DONTWAIT;
eac3731b
JH		 1054
1055 err = sock_error(sk);
1056 if (err)
1057 return err;
1058
1059 if (msg->msg_flags & MSG_OOB)
1060 return -EOPNOTSUPP;
1061
aa8e71f5
HB		 1062 /* SOCK_SEQPACKET: we do not support segmented records */
1063 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1064 return -EOPNOTSUPP;
1065
eac3731b
JH		 1066 lock_sock(sk);
1067
1068 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1069 err = -EPIPE;
1070 goto out;
1071 }
1072
bb664f49
HB		 1073 /* Return if the socket is not in connected state */
1074 if (sk->sk_state != IUCV_CONNECTED) {
1075 err = -ENOTCONN;
1076 goto out;
1077 }
44b1e6b5 1078
bb664f49
HB		 1079 /* initialize defaults */
1080 cmsg_done = 0; /* check for duplicate headers */
1081 txmsg.class = 0;
44b1e6b5 1082
bb664f49 1083 /* iterate over control messages */
f95b414e 1084 for_each_cmsghdr(cmsg, msg) {
bb664f49
HB		 1085 if (!CMSG_OK(msg, cmsg)) {
1086 err = -EINVAL;
1087 goto out;
1088 }
44b1e6b5 1089
bb664f49
HB		 1090 if (cmsg->cmsg_level != SOL_IUCV)
1091 continue;
44b1e6b5 1092
bb664f49
HB		 1093 if (cmsg->cmsg_type & cmsg_done) {
1094 err = -EINVAL;
1095 goto out;
1096 }
1097 cmsg_done |= cmsg->cmsg_type;
44b1e6b5 1098
bb664f49
HB		 1099 switch (cmsg->cmsg_type) {
1100 case SCM_IUCV_TRGCLS:
1101 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
44b1e6b5
HB		 1102 err = -EINVAL;
1103 goto out;
1104 }
44b1e6b5 1105
bb664f49
HB		 1106 /* set iucv message target class */
1107 memcpy(&txmsg.class,
1108 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
44b1e6b5 1109
bb664f49 1110 break;
44b1e6b5 1111
bb664f49
HB		 1112 default:
1113 err = -EINVAL;
1114 goto out;
44b1e6b5 1115 }
bb664f49 1116 }
44b1e6b5 1117
bb664f49
HB		 1118 /* allocate one skb for each iucv message:
1119 * this is fine for SOCK_SEQPACKET (unless we want to support
1120 * segmented records using the MSG_EOR flag), but
1121 * for SOCK_STREAM we might want to improve it in future */
dc5367bc
JW		 1122 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1123 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
e5374399
EC		 1124 linear = len;
1125 } else {
dc5367bc
JW		 1126 if (len < PAGE_SIZE) {
1127 linear = len;
1128 } else {
1129 /* In nonlinear "classic" iucv skb,
1130 * reserve space for iucv_array
1131 */
1132 headroom = sizeof(struct iucv_array) *
1133 (MAX_SKB_FRAGS + 1);
1134 linear = PAGE_SIZE - headroom;
1135 }
e5374399
EC		 1136 }
1137 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1138 noblock, &err, 0);
ed4ac422 1139 if (!skb)
bb664f49 1140 goto out;
e5374399
EC		 1141 if (headroom)
1142 skb_reserve(skb, headroom);
1143 skb_put(skb, linear);
1144 skb->len = len;
1145 skb->data_len = len - linear;
1146 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1147 if (err)
bb664f49 1148 goto fail;
eac3731b 1149
0ea920d2
HB		 1150 /* wait if outstanding messages for iucv path has reached */
1151 timeo = sock_sndtimeo(sk, noblock);
1152 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1153 if (err)
1154 goto fail;
eac3731b 1155
0ea920d2
HB		 1156 /* return -ECONNRESET if the socket is no longer connected */
1157 if (sk->sk_state != IUCV_CONNECTED) {
1158 err = -ECONNRESET;
1159 goto fail;
1160 }
b8942e3b 1161
bb664f49
HB		 1162 /* increment and save iucv message tag for msg_completion cbk */
1163 txmsg.tag = iucv->send_tag++;
f9c41a62 1164 IUCV_SKB_CB(skb)->tag = txmsg.tag;
800c5eb7 1165
3881ac44
UB		 1166 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1167 atomic_inc(&iucv->msg_sent);
1168 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1169 if (err) {
1170 atomic_dec(&iucv->msg_sent);
1171 goto fail;
1172 }
e5374399
EC		 1173 } else { /* Classic VM IUCV transport */
1174 skb_queue_tail(&iucv->send_skb_q, skb);
1175
1176 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1177 skb->len <= 7) {
1178 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1179
1180 /* on success: there is no message_complete callback */
1181 /* for an IPRMDATA msg; remove skb from send queue */
1182 if (err == 0) {
1183 skb_unlink(skb, &iucv->send_skb_q);
1184 kfree_skb(skb);
1185 }
b8942e3b 1186
e5374399
EC		 1187 /* this error should never happen since the */
1188 /* IUCV_IPRMDATA path flag is set... sever path */
1189 if (err == 0x15) {
1190 pr_iucv->path_sever(iucv->path, NULL);
1191 skb_unlink(skb, &iucv->send_skb_q);
1192 err = -EPIPE;
1193 goto fail;
1194 }
1195 } else if (skb_is_nonlinear(skb)) {
1196 struct iucv_array *iba = (struct iucv_array *)skb->head;
1197 int i;
1198
1199 /* skip iucv_array lying in the headroom */
1200 iba[0].address = (u32)(addr_t)skb->data;
1201 iba[0].length = (u32)skb_headlen(skb);
1202 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1203 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1204
1205 iba[i + 1].address =
1206 (u32)(addr_t)skb_frag_address(frag);
1207 iba[i + 1].length = (u32)skb_frag_size(frag);
1208 }
1209 err = pr_iucv->message_send(iucv->path, &txmsg,
1210 IUCV_IPBUFLST, 0,
1211 (void *)iba, skb->len);
1212 } else { /* non-IPRM Linear skb */
1213 err = pr_iucv->message_send(iucv->path, &txmsg,
1214 0, 0, (void *)skb->data, skb->len);
bb664f49 1215 }
e5374399
EC		 1216 if (err) {
1217 if (err == 3) {
1218 user_id[8] = 0;
1219 memcpy(user_id, iucv->dst_user_id, 8);
1220 appl_id[8] = 0;
1221 memcpy(appl_id, iucv->dst_name, 8);
1222 pr_err(
1223 "Application %s on z/VM guest %s exceeds message limit\n",
1224 appl_id, user_id);
1225 err = -EAGAIN;
1226 } else {
1227 err = -EPIPE;
1228 }
eac3731b 1229 skb_unlink(skb, &iucv->send_skb_q);
eac3731b
JH		 1230 goto fail;
1231 }
eac3731b
JH		 1232 }
1233
1234 release_sock(sk);
1235 return len;
1236
1237fail:
1238 kfree_skb(skb);
1239out:
1240 release_sock(sk);
1241 return err;
1242}
1243
a006353a
EC		 1244static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1245{
1246 size_t headroom, linear;
1247 struct sk_buff *skb;
1248 int err;
1249
1250 if (len < PAGE_SIZE) {
1251 headroom = 0;
1252 linear = len;
1253 } else {
1254 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1255 linear = PAGE_SIZE - headroom;
1256 }
1257 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1258 0, &err, GFP_ATOMIC | GFP_DMA);
1259 WARN_ONCE(!skb,
1260 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1261 len, err);
1262 if (skb) {
1263 if (headroom)
1264 skb_reserve(skb, headroom);
1265 skb_put(skb, linear);
1266 skb->len = len;
1267 skb->data_len = len - linear;
1268 }
1269 return skb;
1270}
1271
bf95d20f
HB		 1272/* iucv_process_message() - Receive a single outstanding IUCV message
1273 *
1274 * Locking: must be called with message_q.lock held
1275 */
f0703c80
UB		 1276static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1277 struct iucv_path *path,
1278 struct iucv_message *msg)
1279{
1280 int rc;
b8942e3b
HB		 1281 unsigned int len;
1282
1283 len = iucv_msg_length(msg);
f0703c80 1284
44b1e6b5
HB		 1285 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1286 /* Note: the first 4 bytes are reserved for msg tag */
f9c41a62 1287 IUCV_SKB_CB(skb)->class = msg->class;
44b1e6b5 1288
b8942e3b
HB		 1289 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1290 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1291 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1292 skb->data = NULL;
1293 skb->len = 0;
1294 }
f0703c80 1295 } else {
a006353a
EC		 1296 if (skb_is_nonlinear(skb)) {
1297 struct iucv_array *iba = (struct iucv_array *)skb->head;
1298 int i;
1299
1300 iba[0].address = (u32)(addr_t)skb->data;
1301 iba[0].length = (u32)skb_headlen(skb);
1302 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1303 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1304
1305 iba[i + 1].address =
1306 (u32)(addr_t)skb_frag_address(frag);
1307 iba[i + 1].length = (u32)skb_frag_size(frag);
1308 }
1309 rc = pr_iucv->message_receive(path, msg,
1310 IUCV_IPBUFLST,
1311 (void *)iba, len, NULL);
1312 } else {
1313 rc = pr_iucv->message_receive(path, msg,
6fcd61f7
FB		 1314 msg->flags & IUCV_IPRMDATA,
1315 skb->data, len, NULL);
a006353a 1316 }
f0703c80
UB		 1317 if (rc) {
1318 kfree_skb(skb);
1319 return;
1320 }
a006353a 1321 WARN_ON_ONCE(skb->len != len);
f0703c80
UB		 1322 }
1323
f9c41a62 1324 IUCV_SKB_CB(skb)->offset = 0;
8c68b1a0
UB		 1325 if (sk_filter(sk, skb)) {
1326 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1327 kfree_skb(skb);
1328 return;
1329 }
1330 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1331 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
f0703c80
UB		 1332}
1333
bf95d20f
HB		 1334/* iucv_process_message_q() - Process outstanding IUCV messages
1335 *
1336 * Locking: must be called with message_q.lock held
1337 */
f0703c80
UB		 1338static void iucv_process_message_q(struct sock *sk)
1339{
1340 struct iucv_sock *iucv = iucv_sk(sk);
1341 struct sk_buff *skb;
1342 struct sock_msg_q *p, *n;
1343
1344 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
a006353a 1345 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
f0703c80
UB		 1346 if (!skb)
1347 break;
1348 iucv_process_message(sk, skb, p->path, &p->msg);
1349 list_del(&p->list);
1350 kfree(p);
1351 if (!skb_queue_empty(&iucv->backlog_skb_q))
1352 break;
1353 }
1354}
1355
1b784140
YX		 1356static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1357 size_t len, int flags)
eac3731b
JH		 1358{
1359 int noblock = flags & MSG_DONTWAIT;
1360 struct sock *sk = sock->sk;
561e0360 1361 struct iucv_sock *iucv = iucv_sk(sk);
aa8e71f5 1362 unsigned int copied, rlen;
9fbd87d4 1363 struct sk_buff *skb, *rskb, *cskb;
eac3731b 1364 int err = 0;
f9c41a62 1365 u32 offset;
eac3731b 1366
aac6399c 1367 if ((sk->sk_state == IUCV_DISCONN) &&
f0703c80
UB		 1368 skb_queue_empty(&iucv->backlog_skb_q) &&
1369 skb_queue_empty(&sk->sk_receive_queue) &&
1370 list_empty(&iucv->message_q.list))
561e0360
JH		 1371 return 0;
1372
eac3731b
JH		 1373 if (flags & (MSG_OOB))
1374 return -EOPNOTSUPP;
1375
60d3705f
HB		 1376 /* receive/dequeue next skb:
1377 * the function understands MSG_PEEK and, thus, does not dequeue skb */
eac3731b
JH		 1378 skb = skb_recv_datagram(sk, flags, noblock, &err);
1379 if (!skb) {
1380 if (sk->sk_shutdown & RCV_SHUTDOWN)
1381 return 0;
1382 return err;
1383 }
1384
f9c41a62
UB		 1385 offset = IUCV_SKB_CB(skb)->offset;
1386 rlen = skb->len - offset; /* real length of skb */
aa8e71f5 1387 copied = min_t(unsigned int, rlen, len);
82492a35
UB		 1388 if (!rlen)
1389 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
eac3731b 1390
561e0360 1391 cskb = skb;
51f3d02b 1392 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
802788bf
HB		 1393 if (!(flags & MSG_PEEK))
1394 skb_queue_head(&sk->sk_receive_queue, skb);
1395 return -EFAULT;
eac3731b
JH		 1396 }
1397
aa8e71f5
HB		 1398 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1399 if (sk->sk_type == SOCK_SEQPACKET) {
1400 if (copied < rlen)
1401 msg->msg_flags |= MSG_TRUNC;
1402 /* each iucv message contains a complete record */
1403 msg->msg_flags |= MSG_EOR;
1404 }
eac3731b 1405
44b1e6b5
HB		 1406 /* create control message to store iucv msg target class:
1407 * get the trgcls from the control buffer of the skb due to
1408 * fragmentation of original iucv message. */
1409 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
f9c41a62
UB		 1410 sizeof(IUCV_SKB_CB(skb)->class),
1411 (void *)&IUCV_SKB_CB(skb)->class);
44b1e6b5
HB		 1412 if (err) {
1413 if (!(flags & MSG_PEEK))
1414 skb_queue_head(&sk->sk_receive_queue, skb);
1415 return err;
1416 }
1417
eac3731b
JH		 1418 /* Mark read part of skb as used */
1419 if (!(flags & MSG_PEEK)) {
eac3731b 1420
aa8e71f5
HB		 1421 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1422 if (sk->sk_type == SOCK_STREAM) {
f9c41a62
UB		 1423 if (copied < rlen) {
1424 IUCV_SKB_CB(skb)->offset = offset + copied;
2f139a5d 1425 skb_queue_head(&sk->sk_receive_queue, skb);
aa8e71f5
HB		 1426 goto done;
1427 }
eac3731b
JH		 1428 }
1429
1430 kfree_skb(skb);
800c5eb7
UB		 1431 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1432 atomic_inc(&iucv->msg_recv);
1433 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1434 WARN_ON(1);
1435 iucv_sock_close(sk);
1436 return -EFAULT;
1437 }
1438 }
561e0360
JH		 1439
1440 /* Queue backlog skbs */
bf95d20f 1441 spin_lock_bh(&iucv->message_q.lock);
f0703c80 1442 rskb = skb_dequeue(&iucv->backlog_skb_q);
da99f056 1443 while (rskb) {
f9c41a62 1444 IUCV_SKB_CB(rskb)->offset = 0;
8c68b1a0
UB		 1445 if (__sock_queue_rcv_skb(sk, rskb)) {
1446 /* handle rcv queue full */
f0703c80 1447 skb_queue_head(&iucv->backlog_skb_q,
561e0360
JH		 1448 rskb);
1449 break;
561e0360 1450 }
8c68b1a0 1451 rskb = skb_dequeue(&iucv->backlog_skb_q);
561e0360 1452 }
f0703c80 1453 if (skb_queue_empty(&iucv->backlog_skb_q)) {
f0703c80
UB		 1454 if (!list_empty(&iucv->message_q.list))
1455 iucv_process_message_q(sk);
3881ac44
UB		 1456 if (atomic_read(&iucv->msg_recv) >=
1457 iucv->msglimit / 2) {
9fbd87d4 1458 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
3881ac44
UB		 1459 if (err) {
1460 sk->sk_state = IUCV_DISCONN;
1461 sk->sk_state_change(sk);
1462 }
1463 }
f0703c80 1464 }
bf95d20f 1465 spin_unlock_bh(&iucv->message_q.lock);
60d3705f 1466 }
eac3731b
JH		 1467
1468done:
aa8e71f5
HB		 1469 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1470 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1471 copied = rlen;
1472
1473 return copied;
eac3731b
JH		 1474}
1475
ade994f4 1476static inline __poll_t iucv_accept_poll(struct sock *parent)
eac3731b
JH		 1477{
1478 struct iucv_sock *isk, *n;
1479 struct sock *sk;
1480
da99f056 1481 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
eac3731b
JH		 1482 sk = (struct sock *) isk;
1483
1484 if (sk->sk_state == IUCV_CONNECTED)
a9a08845 1485 return EPOLLIN | EPOLLRDNORM;
eac3731b
JH		 1486 }
1487
1488 return 0;
1489}
1490
f87be894 1491static __poll_t iucv_sock_poll_mask(struct socket *sock, __poll_t events)
eac3731b
JH		 1492{
1493 struct sock *sk = sock->sk;
ade994f4 1494 __poll_t mask = 0;
eac3731b 1495
eac3731b
JH		 1496 if (sk->sk_state == IUCV_LISTEN)
1497 return iucv_accept_poll(sk);
1498
1499 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
a9a08845
LT		 1500 mask |= EPOLLERR |
1501 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
eac3731b
JH		 1502
1503 if (sk->sk_shutdown & RCV_SHUTDOWN)
a9a08845 1504 mask |= EPOLLRDHUP;
eac3731b
JH		 1505
1506 if (sk->sk_shutdown == SHUTDOWN_MASK)
a9a08845 1507 mask |= EPOLLHUP;
eac3731b
JH		 1508
1509 if (!skb_queue_empty(&sk->sk_receive_queue) ||
da99f056 1510 (sk->sk_shutdown & RCV_SHUTDOWN))
a9a08845 1511 mask |= EPOLLIN | EPOLLRDNORM;
eac3731b
JH		 1512
1513 if (sk->sk_state == IUCV_CLOSED)
a9a08845 1514 mask |= EPOLLHUP;
eac3731b 1515
aac6399c 1516 if (sk->sk_state == IUCV_DISCONN)
a9a08845 1517 mask |= EPOLLIN;
561e0360 1518
7f1b0ea4 1519 if (sock_writeable(sk) && iucv_below_msglim(sk))
a9a08845 1520 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
eac3731b 1521 else
9cd3e072 1522 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
eac3731b
JH		 1523
1524 return mask;
1525}
1526
1527static int iucv_sock_shutdown(struct socket *sock, int how)
1528{
1529 struct sock *sk = sock->sk;
1530 struct iucv_sock *iucv = iucv_sk(sk);
1531 struct iucv_message txmsg;
1532 int err = 0;
eac3731b
JH		 1533
1534 how++;
1535
1536 if ((how & ~SHUTDOWN_MASK) || !how)
1537 return -EINVAL;
1538
1539 lock_sock(sk);
da99f056 1540 switch (sk->sk_state) {
82492a35 1541 case IUCV_LISTEN:
e14ad5fa
HB		 1542 case IUCV_DISCONN:
1543 case IUCV_CLOSING:
eac3731b
JH		 1544 case IUCV_CLOSED:
1545 err = -ENOTCONN;
1546 goto fail;
eac3731b 1547 default:
eac3731b
JH		 1548 break;
1549 }
1550
1551 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
82492a35
UB		 1552 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1553 txmsg.class = 0;
1554 txmsg.tag = 0;
1555 err = pr_iucv->message_send(iucv->path, &txmsg,
1556 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1557 if (err) {
1558 switch (err) {
1559 case 1:
1560 err = -ENOTCONN;
1561 break;
1562 case 2:
1563 err = -ECONNRESET;
1564 break;
1565 default:
1566 err = -ENOTCONN;
1567 break;
1568 }
eac3731b 1569 }
82492a35
UB		 1570 } else
1571 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
eac3731b
JH		 1572 }
1573
82492a35 1574 sk->sk_shutdown |= how;
eac3731b 1575 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1042cab8
UB		 1576 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1577 iucv->path) {
82492a35
UB		 1578 err = pr_iucv->path_quiesce(iucv->path, NULL);
1579 if (err)
1580 err = -ENOTCONN;
1581/* skb_queue_purge(&sk->sk_receive_queue); */
1582 }
eac3731b
JH		 1583 skb_queue_purge(&sk->sk_receive_queue);
1584 }
1585
1586 /* Wake up anyone sleeping in poll */
1587 sk->sk_state_change(sk);
1588
1589fail:
1590 release_sock(sk);
1591 return err;
1592}
1593
1594static int iucv_sock_release(struct socket *sock)
1595{
1596 struct sock *sk = sock->sk;
1597 int err = 0;
1598
1599 if (!sk)
1600 return 0;
1601
1602 iucv_sock_close(sk);
1603
eac3731b
JH		 1604 sock_orphan(sk);
1605 iucv_sock_kill(sk);
1606 return err;
1607}
1608
9d5c5d8f
HB		 1609/* getsockopt and setsockopt */
1610static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 1611 char __user *optval, unsigned int optlen)
9d5c5d8f
HB		 1612{
1613 struct sock *sk = sock->sk;
1614 struct iucv_sock *iucv = iucv_sk(sk);
1615 int val;
1616 int rc;
1617
1618 if (level != SOL_IUCV)
1619 return -ENOPROTOOPT;
1620
1621 if (optlen < sizeof(int))
1622 return -EINVAL;
1623
1624 if (get_user(val, (int __user *) optval))
1625 return -EFAULT;
1626
1627 rc = 0;
1628
1629 lock_sock(sk);
1630 switch (optname) {
1631 case SO_IPRMDATA_MSG:
1632 if (val)
1633 iucv->flags |= IUCV_IPRMDATA;
1634 else
1635 iucv->flags &= ~IUCV_IPRMDATA;
1636 break;
09488e2e
HB		 1637 case SO_MSGLIMIT:
1638 switch (sk->sk_state) {
1639 case IUCV_OPEN:
1640 case IUCV_BOUND:
1641 if (val < 1 || val > (u16)(~0))
1642 rc = -EINVAL;
1643 else
1644 iucv->msglimit = val;
1645 break;
1646 default:
1647 rc = -EINVAL;
1648 break;
1649 }
1650 break;
9d5c5d8f
HB		 1651 default:
1652 rc = -ENOPROTOOPT;
1653 break;
1654 }
1655 release_sock(sk);
1656
1657 return rc;
1658}
1659
1660static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1661 char __user *optval, int __user *optlen)
1662{
1663 struct sock *sk = sock->sk;
1664 struct iucv_sock *iucv = iucv_sk(sk);
51363b87
UB		 1665 unsigned int val;
1666 int len;
9d5c5d8f
HB		 1667
1668 if (level != SOL_IUCV)
1669 return -ENOPROTOOPT;
1670
1671 if (get_user(len, optlen))
1672 return -EFAULT;
1673
1674 if (len < 0)
1675 return -EINVAL;
1676
1677 len = min_t(unsigned int, len, sizeof(int));
1678
1679 switch (optname) {
1680 case SO_IPRMDATA_MSG:
1681 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1682 break;
09488e2e
HB		 1683 case SO_MSGLIMIT:
1684 lock_sock(sk);
1685 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1686 : iucv->msglimit; /* default */
1687 release_sock(sk);
1688 break;
51363b87
UB		 1689 case SO_MSGSIZE:
1690 if (sk->sk_state == IUCV_OPEN)
1691 return -EBADFD;
1692 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1693 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1694 0x7fffffff;
1695 break;
9d5c5d8f
HB		 1696 default:
1697 return -ENOPROTOOPT;
1698 }
1699
1700 if (put_user(len, optlen))
1701 return -EFAULT;
1702 if (copy_to_user(optval, &val, len))
1703 return -EFAULT;
1704
1705 return 0;
1706}
1707
1708
eac3731b
JH		 1709/* Callback wrappers - called from iucv base support */
1710static int iucv_callback_connreq(struct iucv_path *path,
1711 u8 ipvmid[8], u8 ipuser[16])
1712{
1713 unsigned char user_data[16];
1714 unsigned char nuser_data[16];
1715 unsigned char src_name[8];
eac3731b
JH		 1716 struct sock *sk, *nsk;
1717 struct iucv_sock *iucv, *niucv;
1718 int err;
1719
1720 memcpy(src_name, ipuser, 8);
1721 EBCASC(src_name, 8);
1722 /* Find out if this path belongs to af_iucv. */
1723 read_lock(&iucv_sk_list.lock);
1724 iucv = NULL;
febca281 1725 sk = NULL;
b67bfe0d 1726 sk_for_each(sk, &iucv_sk_list.head)
eac3731b
JH		 1727 if (sk->sk_state == IUCV_LISTEN &&
1728 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1729 /*
1730 * Found a listening socket with
1731 * src_name == ipuser[0-7].
1732 */
1733 iucv = iucv_sk(sk);
1734 break;
1735 }
1736 read_unlock(&iucv_sk_list.lock);
1737 if (!iucv)
1738 /* No socket found, not one of our paths. */
1739 return -EINVAL;
1740
1741 bh_lock_sock(sk);
1742
1743 /* Check if parent socket is listening */
1744 low_nmcpy(user_data, iucv->src_name);
1745 high_nmcpy(user_data, iucv->dst_name);
1746 ASCEBC(user_data, sizeof(user_data));
1747 if (sk->sk_state != IUCV_LISTEN) {
6fcd61f7 1748 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1749 iucv_path_free(path);
eac3731b
JH		 1750 goto fail;
1751 }
1752
1753 /* Check for backlog size */
1754 if (sk_acceptq_is_full(sk)) {
6fcd61f7 1755 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1756 iucv_path_free(path);
eac3731b
JH		 1757 goto fail;
1758 }
1759
1760 /* Create the new socket */
11aa9c28 1761 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
da99f056 1762 if (!nsk) {
6fcd61f7 1763 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1764 iucv_path_free(path);
eac3731b
JH		 1765 goto fail;
1766 }
1767
1768 niucv = iucv_sk(nsk);
1769 iucv_sock_init(nsk, sk);
1770
1771 /* Set the new iucv_sock */
1772 memcpy(niucv->dst_name, ipuser + 8, 8);
1773 EBCASC(niucv->dst_name, 8);
1774 memcpy(niucv->dst_user_id, ipvmid, 8);
1775 memcpy(niucv->src_name, iucv->src_name, 8);
1776 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1777 niucv->path = path;
1778
1779 /* Call iucv_accept */
1780 high_nmcpy(nuser_data, ipuser + 8);
1781 memcpy(nuser_data + 8, niucv->src_name, 8);
1782 ASCEBC(nuser_data + 8, 8);
1783
09488e2e
HB		 1784 /* set message limit for path based on msglimit of accepting socket */
1785 niucv->msglimit = iucv->msglimit;
1786 path->msglim = iucv->msglimit;
6fcd61f7 1787 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
da99f056 1788 if (err) {
7d316b94 1789 iucv_sever_path(nsk, 1);
65dbd7c2 1790 iucv_sock_kill(nsk);
eac3731b
JH		 1791 goto fail;
1792 }
1793
1794 iucv_accept_enqueue(sk, nsk);
1795
1796 /* Wake up accept */
1797 nsk->sk_state = IUCV_CONNECTED;
676d2369 1798 sk->sk_data_ready(sk);
eac3731b
JH		 1799 err = 0;
1800fail:
1801 bh_unlock_sock(sk);
1802 return 0;
1803}
1804
1805static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1806{
1807 struct sock *sk = path->private;
1808
1809 sk->sk_state = IUCV_CONNECTED;
1810 sk->sk_state_change(sk);
1811}
1812
1813static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1814{
1815 struct sock *sk = path->private;
561e0360 1816 struct iucv_sock *iucv = iucv_sk(sk);
f0703c80
UB		 1817 struct sk_buff *skb;
1818 struct sock_msg_q *save_msg;
1819 int len;
561e0360 1820
fe86e54e 1821 if (sk->sk_shutdown & RCV_SHUTDOWN) {
6fcd61f7 1822 pr_iucv->message_reject(path, msg);
eac3731b 1823 return;
fe86e54e 1824 }
eac3731b 1825
3fa6b5ad 1826 spin_lock(&iucv->message_q.lock);
eac3731b 1827
f0703c80
UB		 1828 if (!list_empty(&iucv->message_q.list) ||
1829 !skb_queue_empty(&iucv->backlog_skb_q))
1830 goto save_message;
1831
1832 len = atomic_read(&sk->sk_rmem_alloc);
87fb4b7b 1833 len += SKB_TRUESIZE(iucv_msg_length(msg));
f0703c80
UB		 1834 if (len > sk->sk_rcvbuf)
1835 goto save_message;
1836
a006353a 1837 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
f0703c80
UB		 1838 if (!skb)
1839 goto save_message;
eac3731b 1840
f0703c80 1841 iucv_process_message(sk, skb, path, msg);
3fa6b5ad 1842 goto out_unlock;
eac3731b 1843
f0703c80
UB		 1844save_message:
1845 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
d4444722 1846 if (!save_msg)
a56635a5 1847 goto out_unlock;
f0703c80
UB		 1848 save_msg->path = path;
1849 save_msg->msg = *msg;
eac3731b 1850
f0703c80 1851 list_add_tail(&save_msg->list, &iucv->message_q.list);
3fa6b5ad
HB		 1852
1853out_unlock:
f0703c80 1854 spin_unlock(&iucv->message_q.lock);
eac3731b
JH		 1855}
1856
1857static void iucv_callback_txdone(struct iucv_path *path,
1858 struct iucv_message *msg)
1859{
1860 struct sock *sk = path->private;
f2a77991 1861 struct sk_buff *this = NULL;
eac3731b
JH		 1862 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1863 struct sk_buff *list_skb = list->next;
1864 unsigned long flags;
1865
7d316b94 1866 bh_lock_sock(sk);
f2a77991 1867 if (!skb_queue_empty(list)) {
561e0360
JH		 1868 spin_lock_irqsave(&list->lock, flags);
1869
f2a77991 1870 while (list_skb != (struct sk_buff *)list) {
f5738e2e 1871 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
f2a77991
UB		 1872 this = list_skb;
1873 break;
1874 }
561e0360 1875 list_skb = list_skb->next;
f2a77991
UB		 1876 }
1877 if (this)
1878 __skb_unlink(this, list);
561e0360
JH		 1879
1880 spin_unlock_irqrestore(&list->lock, flags);
eac3731b 1881
0ea920d2
HB		 1882 if (this) {
1883 kfree_skb(this);
1884 /* wake up any process waiting for sending */
1885 iucv_sock_wake_msglim(sk);
1886 }
561e0360 1887 }
eac3731b 1888
da99f056 1889 if (sk->sk_state == IUCV_CLOSING) {
561e0360
JH		 1890 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1891 sk->sk_state = IUCV_CLOSED;
1892 sk->sk_state_change(sk);
1893 }
1894 }
7d316b94 1895 bh_unlock_sock(sk);
eac3731b 1896
eac3731b
JH		 1897}
1898
1899static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1900{
1901 struct sock *sk = path->private;
1902
7d316b94
UB		 1903 if (sk->sk_state == IUCV_CLOSED)
1904 return;
1905
1906 bh_lock_sock(sk);
1907 iucv_sever_path(sk, 1);
aac6399c 1908 sk->sk_state = IUCV_DISCONN;
eac3731b
JH		 1909
1910 sk->sk_state_change(sk);
7d316b94 1911 bh_unlock_sock(sk);
eac3731b
JH		 1912}
1913
af88b52d
HB		 1914/* called if the other communication side shuts down its RECV direction;
1915 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1916 */
1917static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1918{
1919 struct sock *sk = path->private;
1920
1921 bh_lock_sock(sk);
1922 if (sk->sk_state != IUCV_CLOSED) {
1923 sk->sk_shutdown |= SEND_SHUTDOWN;
1924 sk->sk_state_change(sk);
1925 }
1926 bh_unlock_sock(sk);
1927}
1928
3881ac44
UB		 1929/***************** HiperSockets transport callbacks ********************/
1930static void afiucv_swap_src_dest(struct sk_buff *skb)
1931{
1932 struct af_iucv_trans_hdr *trans_hdr =
1933 (struct af_iucv_trans_hdr *)skb->data;
1934 char tmpID[8];
1935 char tmpName[8];
1936
1937 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1938 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1939 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1940 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1941 memcpy(tmpID, trans_hdr->srcUserID, 8);
1942 memcpy(tmpName, trans_hdr->srcAppName, 8);
1943 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1944 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1945 memcpy(trans_hdr->destUserID, tmpID, 8);
1946 memcpy(trans_hdr->destAppName, tmpName, 8);
1947 skb_push(skb, ETH_HLEN);
1948 memset(skb->data, 0, ETH_HLEN);
1949}
1950
1951/**
1952 * afiucv_hs_callback_syn - react on received SYN
1953 **/
1954static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1955{
1956 struct sock *nsk;
1957 struct iucv_sock *iucv, *niucv;
1958 struct af_iucv_trans_hdr *trans_hdr;
1959 int err;
1960
1961 iucv = iucv_sk(sk);
1962 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1963 if (!iucv) {
1964 /* no sock - connection refused */
1965 afiucv_swap_src_dest(skb);
1966 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1967 err = dev_queue_xmit(skb);
1968 goto out;
1969 }
1970
11aa9c28 1971 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
3881ac44
UB		 1972 bh_lock_sock(sk);
1973 if ((sk->sk_state != IUCV_LISTEN) ||
1974 sk_acceptq_is_full(sk) ||
1975 !nsk) {
1976 /* error on server socket - connection refused */
3881ac44
UB		 1977 afiucv_swap_src_dest(skb);
1978 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1979 err = dev_queue_xmit(skb);
4d520f62 1980 iucv_sock_kill(nsk);
3881ac44
UB		 1981 bh_unlock_sock(sk);
1982 goto out;
1983 }
1984
1985 niucv = iucv_sk(nsk);
1986 iucv_sock_init(nsk, sk);
1987 niucv->transport = AF_IUCV_TRANS_HIPER;
1988 niucv->msglimit = iucv->msglimit;
1989 if (!trans_hdr->window)
1990 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1991 else
1992 niucv->msglimit_peer = trans_hdr->window;
1993 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1994 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1995 memcpy(niucv->src_name, iucv->src_name, 8);
1996 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1997 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
800c5eb7
UB		 1998 niucv->hs_dev = iucv->hs_dev;
1999 dev_hold(niucv->hs_dev);
3881ac44
UB		 2000 afiucv_swap_src_dest(skb);
2001 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2002 trans_hdr->window = niucv->msglimit;
2003 /* if receiver acks the xmit connection is established */
2004 err = dev_queue_xmit(skb);
2005 if (!err) {
2006 iucv_accept_enqueue(sk, nsk);
2007 nsk->sk_state = IUCV_CONNECTED;
676d2369 2008 sk->sk_data_ready(sk);
3881ac44
UB		 2009 } else
2010 iucv_sock_kill(nsk);
2011 bh_unlock_sock(sk);
2012
2013out:
2014 return NET_RX_SUCCESS;
2015}
2016
2017/**
2018 * afiucv_hs_callback_synack() - react on received SYN-ACK
2019 **/
2020static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2021{
2022 struct iucv_sock *iucv = iucv_sk(sk);
2023 struct af_iucv_trans_hdr *trans_hdr =
2024 (struct af_iucv_trans_hdr *)skb->data;
2025
2026 if (!iucv)
2027 goto out;
2028 if (sk->sk_state != IUCV_BOUND)
2029 goto out;
2030 bh_lock_sock(sk);
2031 iucv->msglimit_peer = trans_hdr->window;
2032 sk->sk_state = IUCV_CONNECTED;
2033 sk->sk_state_change(sk);
2034 bh_unlock_sock(sk);
2035out:
2036 kfree_skb(skb);
2037 return NET_RX_SUCCESS;
2038}
2039
2040/**
2041 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2042 **/
2043static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2044{
2045 struct iucv_sock *iucv = iucv_sk(sk);
2046
2047 if (!iucv)
2048 goto out;
2049 if (sk->sk_state != IUCV_BOUND)
2050 goto out;
2051 bh_lock_sock(sk);
2052 sk->sk_state = IUCV_DISCONN;
2053 sk->sk_state_change(sk);
2054 bh_unlock_sock(sk);
2055out:
2056 kfree_skb(skb);
2057 return NET_RX_SUCCESS;
2058}
2059
2060/**
2061 * afiucv_hs_callback_fin() - react on received FIN
2062 **/
2063static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2064{
2065 struct iucv_sock *iucv = iucv_sk(sk);
2066
2067 /* other end of connection closed */
800c5eb7
UB		 2068 if (!iucv)
2069 goto out;
2070 bh_lock_sock(sk);
2071 if (sk->sk_state == IUCV_CONNECTED) {
aac6399c 2072 sk->sk_state = IUCV_DISCONN;
3881ac44 2073 sk->sk_state_change(sk);
3881ac44 2074 }
800c5eb7
UB		 2075 bh_unlock_sock(sk);
2076out:
3881ac44
UB		 2077 kfree_skb(skb);
2078 return NET_RX_SUCCESS;
2079}
2080
2081/**
2082 * afiucv_hs_callback_win() - react on received WIN
2083 **/
2084static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2085{
2086 struct iucv_sock *iucv = iucv_sk(sk);
2087 struct af_iucv_trans_hdr *trans_hdr =
2088 (struct af_iucv_trans_hdr *)skb->data;
2089
2090 if (!iucv)
2091 return NET_RX_SUCCESS;
2092
2093 if (sk->sk_state != IUCV_CONNECTED)
2094 return NET_RX_SUCCESS;
2095
2096 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2097 iucv_sock_wake_msglim(sk);
2098 return NET_RX_SUCCESS;
2099}
2100
2101/**
2102 * afiucv_hs_callback_rx() - react on received data
2103 **/
2104static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2105{
2106 struct iucv_sock *iucv = iucv_sk(sk);
2107
2108 if (!iucv) {
2109 kfree_skb(skb);
2110 return NET_RX_SUCCESS;
2111 }
2112
2113 if (sk->sk_state != IUCV_CONNECTED) {
2114 kfree_skb(skb);
2115 return NET_RX_SUCCESS;
2116 }
2117
82492a35
UB		 2118 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2119 kfree_skb(skb);
2120 return NET_RX_SUCCESS;
2121 }
2122
979f66b3 2123 /* write stuff from iucv_msg to skb cb */
3881ac44
UB		 2124 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2125 skb_reset_transport_header(skb);
2126 skb_reset_network_header(skb);
f9c41a62 2127 IUCV_SKB_CB(skb)->offset = 0;
8c68b1a0
UB		 2128 if (sk_filter(sk, skb)) {
2129 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2130 kfree_skb(skb);
2131 return NET_RX_SUCCESS;
2132 }
2133
3881ac44
UB		 2134 spin_lock(&iucv->message_q.lock);
2135 if (skb_queue_empty(&iucv->backlog_skb_q)) {
8c68b1a0 2136 if (__sock_queue_rcv_skb(sk, skb))
3881ac44
UB		 2137 /* handle rcv queue full */
2138 skb_queue_tail(&iucv->backlog_skb_q, skb);
3881ac44
UB		 2139 } else
2140 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2141 spin_unlock(&iucv->message_q.lock);
2142 return NET_RX_SUCCESS;
2143}
2144
2145/**
2146 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2147 * transport
2148 * called from netif RX softirq
2149 **/
2150static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2151 struct packet_type *pt, struct net_device *orig_dev)
2152{
3881ac44
UB		 2153 struct sock *sk;
2154 struct iucv_sock *iucv;
2155 struct af_iucv_trans_hdr *trans_hdr;
2156 char nullstring[8];
2157 int err = 0;
2158
979f66b3
EC		 2159 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2160 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2161 (int)skb->len,
2162 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2163 kfree_skb(skb);
2164 return NET_RX_SUCCESS;
2165 }
2166 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2167 if (skb_linearize(skb)) {
2168 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2169 (int)skb->len);
2170 kfree_skb(skb);
2171 return NET_RX_SUCCESS;
2172 }
3881ac44
UB		 2173 skb_pull(skb, ETH_HLEN);
2174 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2175 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2176 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2177 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2178 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2179 memset(nullstring, 0, sizeof(nullstring));
2180 iucv = NULL;
2181 sk = NULL;
2182 read_lock(&iucv_sk_list.lock);
b67bfe0d 2183 sk_for_each(sk, &iucv_sk_list.head) {
3881ac44
UB		 2184 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2185 if ((!memcmp(&iucv_sk(sk)->src_name,
2186 trans_hdr->destAppName, 8)) &&
2187 (!memcmp(&iucv_sk(sk)->src_user_id,
2188 trans_hdr->destUserID, 8)) &&
2189 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2190 (!memcmp(&iucv_sk(sk)->dst_user_id,
2191 nullstring, 8))) {
2192 iucv = iucv_sk(sk);
2193 break;
2194 }
2195 } else {
2196 if ((!memcmp(&iucv_sk(sk)->src_name,
2197 trans_hdr->destAppName, 8)) &&
2198 (!memcmp(&iucv_sk(sk)->src_user_id,
2199 trans_hdr->destUserID, 8)) &&
2200 (!memcmp(&iucv_sk(sk)->dst_name,
2201 trans_hdr->srcAppName, 8)) &&
2202 (!memcmp(&iucv_sk(sk)->dst_user_id,
2203 trans_hdr->srcUserID, 8))) {
2204 iucv = iucv_sk(sk);
2205 break;
2206 }
2207 }
2208 }
2209 read_unlock(&iucv_sk_list.lock);
2210 if (!iucv)
2211 sk = NULL;
2212
2213 /* no sock
2214 how should we send with no sock
2215 1) send without sock no send rc checking?
2216 2) introduce default sock to handle this cases
2217
2218 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2219 data -> send FIN
2220 SYN|ACK, SYN|FIN, FIN -> no action? */
2221
2222 switch (trans_hdr->flags) {
2223 case AF_IUCV_FLAG_SYN:
2224 /* connect request */
2225 err = afiucv_hs_callback_syn(sk, skb);
2226 break;
2227 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2228 /* connect request confirmed */
2229 err = afiucv_hs_callback_synack(sk, skb);
2230 break;
2231 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2232 /* connect request refused */
2233 err = afiucv_hs_callback_synfin(sk, skb);
2234 break;
2235 case (AF_IUCV_FLAG_FIN):
2236 /* close request */
2237 err = afiucv_hs_callback_fin(sk, skb);
2238 break;
2239 case (AF_IUCV_FLAG_WIN):
2240 err = afiucv_hs_callback_win(sk, skb);
800c5eb7
UB		 2241 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2242 kfree_skb(skb);
2243 break;
2244 }
82492a35
UB		 2245 /* fall through and receive non-zero length data */
2246 case (AF_IUCV_FLAG_SHT):
2247 /* shutdown request */
2248 /* fall through and receive zero length data */
3881ac44
UB		 2249 case 0:
2250 /* plain data frame */
f9c41a62 2251 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
3881ac44
UB		 2252 err = afiucv_hs_callback_rx(sk, skb);
2253 break;
2254 default:
2255 ;
2256 }
2257
2258 return err;
2259}
2260
2261/**
2262 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2263 * transport
2264 **/
2265static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2266 enum iucv_tx_notify n)
2267{
2268 struct sock *isk = skb->sk;
2269 struct sock *sk = NULL;
2270 struct iucv_sock *iucv = NULL;
2271 struct sk_buff_head *list;
2272 struct sk_buff *list_skb;
800c5eb7 2273 struct sk_buff *nskb;
3881ac44 2274 unsigned long flags;
3881ac44 2275
800c5eb7 2276 read_lock_irqsave(&iucv_sk_list.lock, flags);
b67bfe0d 2277 sk_for_each(sk, &iucv_sk_list.head)
3881ac44
UB		 2278 if (sk == isk) {
2279 iucv = iucv_sk(sk);
2280 break;
2281 }
800c5eb7 2282 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
3881ac44 2283
800c5eb7 2284 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
3881ac44
UB		 2285 return;
2286
3881ac44 2287 list = &iucv->send_skb_q;
800c5eb7 2288 spin_lock_irqsave(&list->lock, flags);
3881ac44
UB		 2289 if (skb_queue_empty(list))
2290 goto out_unlock;
800c5eb7
UB		 2291 list_skb = list->next;
2292 nskb = list_skb->next;
3881ac44
UB		 2293 while (list_skb != (struct sk_buff *)list) {
2294 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
3881ac44
UB		 2295 switch (n) {
2296 case TX_NOTIFY_OK:
800c5eb7
UB		 2297 __skb_unlink(list_skb, list);
2298 kfree_skb(list_skb);
3881ac44 2299 iucv_sock_wake_msglim(sk);
3881ac44
UB		 2300 break;
2301 case TX_NOTIFY_PENDING:
2302 atomic_inc(&iucv->pendings);
2303 break;
2304 case TX_NOTIFY_DELAYED_OK:
800c5eb7 2305 __skb_unlink(list_skb, list);
3881ac44
UB		 2306 atomic_dec(&iucv->pendings);
2307 if (atomic_read(&iucv->pendings) <= 0)
2308 iucv_sock_wake_msglim(sk);
800c5eb7 2309 kfree_skb(list_skb);
3881ac44
UB		 2310 break;
2311 case TX_NOTIFY_UNREACHABLE:
2312 case TX_NOTIFY_DELAYED_UNREACHABLE:
2313 case TX_NOTIFY_TPQFULL: /* not yet used */
2314 case TX_NOTIFY_GENERALERROR:
2315 case TX_NOTIFY_DELAYED_GENERALERROR:
800c5eb7
UB		 2316 __skb_unlink(list_skb, list);
2317 kfree_skb(list_skb);
2318 if (sk->sk_state == IUCV_CONNECTED) {
2319 sk->sk_state = IUCV_DISCONN;
2320 sk->sk_state_change(sk);
2321 }
3881ac44
UB		 2322 break;
2323 }
2324 break;
2325 }
800c5eb7
UB		 2326 list_skb = nskb;
2327 nskb = nskb->next;
3881ac44 2328 }
800c5eb7 2329out_unlock:
3881ac44
UB		 2330 spin_unlock_irqrestore(&list->lock, flags);
2331
42bd48e0
UB		 2332 if (sk->sk_state == IUCV_CLOSING) {
2333 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2334 sk->sk_state = IUCV_CLOSED;
2335 sk->sk_state_change(sk);
2336 }
2337 }
2338
3881ac44 2339}
9fbd87d4
UB		 2340
2341/*
2342 * afiucv_netdev_event: handle netdev notifier chain events
2343 */
2344static int afiucv_netdev_event(struct notifier_block *this,
2345 unsigned long event, void *ptr)
2346{
351638e7 2347 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
9fbd87d4
UB		 2348 struct sock *sk;
2349 struct iucv_sock *iucv;
2350
2351 switch (event) {
2352 case NETDEV_REBOOT:
2353 case NETDEV_GOING_DOWN:
b67bfe0d 2354 sk_for_each(sk, &iucv_sk_list.head) {
9fbd87d4
UB		 2355 iucv = iucv_sk(sk);
2356 if ((iucv->hs_dev == event_dev) &&
2357 (sk->sk_state == IUCV_CONNECTED)) {
2358 if (event == NETDEV_GOING_DOWN)
2359 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2360 sk->sk_state = IUCV_DISCONN;
2361 sk->sk_state_change(sk);
2362 }
2363 }
2364 break;
2365 case NETDEV_DOWN:
2366 case NETDEV_UNREGISTER:
2367 default:
2368 break;
2369 }
2370 return NOTIFY_DONE;
2371}
2372
2373static struct notifier_block afiucv_netdev_notifier = {
2374 .notifier_call = afiucv_netdev_event,
2375};
2376
5708e868 2377static const struct proto_ops iucv_sock_ops = {
eac3731b
JH		 2378 .family = PF_IUCV,
2379 .owner = THIS_MODULE,
2380 .release = iucv_sock_release,
2381 .bind = iucv_sock_bind,
2382 .connect = iucv_sock_connect,
2383 .listen = iucv_sock_listen,
2384 .accept = iucv_sock_accept,
2385 .getname = iucv_sock_getname,
2386 .sendmsg = iucv_sock_sendmsg,
2387 .recvmsg = iucv_sock_recvmsg,
f87be894 2388 .poll_mask = iucv_sock_poll_mask,
eac3731b
JH		 2389 .ioctl = sock_no_ioctl,
2390 .mmap = sock_no_mmap,
2391 .socketpair = sock_no_socketpair,
2392 .shutdown = iucv_sock_shutdown,
9d5c5d8f
HB		 2393 .setsockopt = iucv_sock_setsockopt,
2394 .getsockopt = iucv_sock_getsockopt,
eac3731b
JH		 2395};
2396
ec1b4cf7 2397static const struct net_proto_family iucv_sock_family_ops = {
eac3731b
JH		 2398 .family = AF_IUCV,
2399 .owner = THIS_MODULE,
2400 .create = iucv_sock_create,
2401};
2402
3881ac44
UB		 2403static struct packet_type iucv_packet_type = {
2404 .type = cpu_to_be16(ETH_P_AF_IUCV),
2405 .func = afiucv_hs_rcv,
2406};
2407
2408static int afiucv_iucv_init(void)
6fcd61f7
FB		 2409{
2410 int err;
2411
2412 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2413 if (err)
2414 goto out;
2415 /* establish dummy device */
2416 af_iucv_driver.bus = pr_iucv->bus;
2417 err = driver_register(&af_iucv_driver);
2418 if (err)
2419 goto out_iucv;
2420 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2421 if (!af_iucv_dev) {
2422 err = -ENOMEM;
2423 goto out_driver;
2424 }
2425 dev_set_name(af_iucv_dev, "af_iucv");
2426 af_iucv_dev->bus = pr_iucv->bus;
2427 af_iucv_dev->parent = pr_iucv->root;
2428 af_iucv_dev->release = (void (*)(struct device *))kfree;
2429 af_iucv_dev->driver = &af_iucv_driver;
2430 err = device_register(af_iucv_dev);
2431 if (err)
fa6a91e9 2432 goto out_iucv_dev;
6fcd61f7
FB		 2433 return 0;
2434
fa6a91e9
AY		 2435out_iucv_dev:
2436 put_device(af_iucv_dev);
6fcd61f7
FB		 2437out_driver:
2438 driver_unregister(&af_iucv_driver);
2439out_iucv:
2440 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2441out:
2442 return err;
2443}
2444
da99f056 2445static int __init afiucv_init(void)
eac3731b
JH		 2446{
2447 int err;
2448
3881ac44
UB		 2449 if (MACHINE_IS_VM) {
2450 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2451 if (unlikely(err)) {
2452 WARN_ON(err);
2453 err = -EPROTONOSUPPORT;
2454 goto out;
2455 }
eac3731b 2456
3881ac44
UB		 2457 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2458 if (!pr_iucv) {
2459 printk(KERN_WARNING "iucv_if lookup failed\n");
2460 memset(&iucv_userid, 0, sizeof(iucv_userid));
2461 }
2462 } else {
2463 memset(&iucv_userid, 0, sizeof(iucv_userid));
2464 pr_iucv = NULL;
6fcd61f7
FB		 2465 }
2466
eac3731b
JH		 2467 err = proto_register(&iucv_proto, 0);
2468 if (err)
6fcd61f7 2469 goto out;
eac3731b
JH		 2470 err = sock_register(&iucv_sock_family_ops);
2471 if (err)
2472 goto out_proto;
6fcd61f7 2473
3881ac44
UB		 2474 if (pr_iucv) {
2475 err = afiucv_iucv_init();
2476 if (err)
2477 goto out_sock;
9fbd87d4
UB		 2478 } else
2479 register_netdevice_notifier(&afiucv_netdev_notifier);
3881ac44 2480 dev_add_pack(&iucv_packet_type);
eac3731b
JH		 2481 return 0;
2482
c23cad92
UB		 2483out_sock:
2484 sock_unregister(PF_IUCV);
eac3731b
JH		 2485out_proto:
2486 proto_unregister(&iucv_proto);
eac3731b 2487out:
6fcd61f7
FB		 2488 if (pr_iucv)
2489 symbol_put(iucv_if);
eac3731b
JH		 2490 return err;
2491}
2492
2493static void __exit afiucv_exit(void)
2494{
3881ac44
UB		 2495 if (pr_iucv) {
2496 device_unregister(af_iucv_dev);
2497 driver_unregister(&af_iucv_driver);
2498 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2499 symbol_put(iucv_if);
9fbd87d4
UB		 2500 } else
2501 unregister_netdevice_notifier(&afiucv_netdev_notifier);
3881ac44 2502 dev_remove_pack(&iucv_packet_type);
eac3731b
JH		 2503 sock_unregister(PF_IUCV);
2504 proto_unregister(&iucv_proto);
eac3731b
JH		 2505}
2506
2507module_init(afiucv_init);
2508module_exit(afiucv_exit);
2509
2510MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2511MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2512MODULE_VERSION(VERSION);
2513MODULE_LICENSE("GPL");
2514MODULE_ALIAS_NETPROTO(PF_IUCV);
3881ac44 2515
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