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kcmp: make it depend on CHECKPOINT_RESTORE
[deliverable/linux.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>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/skbuff.h>
23#include <linux/init.h>
24#include <linux/poll.h>
25#include <net/sock.h>
26#include <asm/ebcdic.h>
27#include <asm/cpcmd.h>
28#include <linux/kmod.h>
29
eac3731b
JH		 30#include <net/iucv/af_iucv.h>
31
3881ac44 32#define VERSION "1.2"
eac3731b
JH		 33
34static char iucv_userid[80];
35
5708e868 36static const struct proto_ops iucv_sock_ops;
eac3731b
JH		 37
38static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42};
43
6fcd61f7
FB		 44static struct iucv_interface *pr_iucv;
45
b8942e3b
HB		 46/* special AF_IUCV IPRM messages */
47static const u8 iprm_shutdown[8] =
48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
49
44b1e6b5
HB		 50#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
51
52/* macros to set/get socket control buffer at correct offset */
53#define CB_TAG(skb) ((skb)->cb) /* iucv message tag */
54#define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag))
55#define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
56#define CB_TRGCLS_LEN (TRGCLS_SIZE)
57
0ea920d2
HB		 58#define __iucv_sock_wait(sk, condition, timeo, ret) \
59do { \
60 DEFINE_WAIT(__wait); \
61 long __timeo = timeo; \
62 ret = 0; \
aa395145 63 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
0ea920d2 64 while (!(condition)) { \
0ea920d2
HB		 65 if (!__timeo) { \
66 ret = -EAGAIN; \
67 break; \
68 } \
69 if (signal_pending(current)) { \
70 ret = sock_intr_errno(__timeo); \
71 break; \
72 } \
73 release_sock(sk); \
74 __timeo = schedule_timeout(__timeo); \
75 lock_sock(sk); \
76 ret = sock_error(sk); \
77 if (ret) \
78 break; \
79 } \
aa395145 80 finish_wait(sk_sleep(sk), &__wait); \
0ea920d2
HB		 81} while (0)
82
83#define iucv_sock_wait(sk, condition, timeo) \
84({ \
85 int __ret = 0; \
86 if (!(condition)) \
87 __iucv_sock_wait(sk, condition, timeo, __ret); \
88 __ret; \
89})
44b1e6b5 90
57f20448
HC		 91static void iucv_sock_kill(struct sock *sk);
92static void iucv_sock_close(struct sock *sk);
7d316b94 93static void iucv_sever_path(struct sock *, int);
57f20448 94
3881ac44
UB		 95static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
96 struct packet_type *pt, struct net_device *orig_dev);
97static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
98 struct sk_buff *skb, u8 flags);
99static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
100
eac3731b
JH		 101/* Call Back functions */
102static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
103static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
104static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
da99f056
HC		 105static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
106 u8 ipuser[16]);
eac3731b 107static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
af88b52d 108static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
eac3731b
JH		 109
110static struct iucv_sock_list iucv_sk_list = {
3db8ce35 111 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
eac3731b
JH		 112 .autobind_name = ATOMIC_INIT(0)
113};
114
115static struct iucv_handler af_iucv_handler = {
116 .path_pending = iucv_callback_connreq,
117 .path_complete = iucv_callback_connack,
118 .path_severed = iucv_callback_connrej,
119 .message_pending = iucv_callback_rx,
af88b52d
HB		 120 .message_complete = iucv_callback_txdone,
121 .path_quiesced = iucv_callback_shutdown,
eac3731b
JH		 122};
123
124static inline void high_nmcpy(unsigned char *dst, char *src)
125{
126 memcpy(dst, src, 8);
127}
128
129static inline void low_nmcpy(unsigned char *dst, char *src)
130{
131 memcpy(&dst[8], src, 8);
132}
133
c23cad92
UB		 134static int afiucv_pm_prepare(struct device *dev)
135{
136#ifdef CONFIG_PM_DEBUG
137 printk(KERN_WARNING "afiucv_pm_prepare\n");
138#endif
139 return 0;
140}
141
142static void afiucv_pm_complete(struct device *dev)
143{
144#ifdef CONFIG_PM_DEBUG
145 printk(KERN_WARNING "afiucv_pm_complete\n");
146#endif
c23cad92
UB		 147}
148
149/**
150 * afiucv_pm_freeze() - Freeze PM callback
151 * @dev: AFIUCV dummy device
152 *
153 * Sever all established IUCV communication pathes
154 */
155static int afiucv_pm_freeze(struct device *dev)
156{
157 struct iucv_sock *iucv;
158 struct sock *sk;
159 struct hlist_node *node;
160 int err = 0;
161
162#ifdef CONFIG_PM_DEBUG
163 printk(KERN_WARNING "afiucv_pm_freeze\n");
164#endif
165 read_lock(&iucv_sk_list.lock);
166 sk_for_each(sk, node, &iucv_sk_list.head) {
167 iucv = iucv_sk(sk);
c23cad92 168 switch (sk->sk_state) {
c23cad92
UB		 169 case IUCV_DISCONN:
170 case IUCV_CLOSING:
171 case IUCV_CONNECTED:
7d316b94 172 iucv_sever_path(sk, 0);
c23cad92
UB		 173 break;
174 case IUCV_OPEN:
175 case IUCV_BOUND:
176 case IUCV_LISTEN:
177 case IUCV_CLOSED:
178 default:
179 break;
180 }
7d316b94
UB		 181 skb_queue_purge(&iucv->send_skb_q);
182 skb_queue_purge(&iucv->backlog_skb_q);
c23cad92
UB		 183 }
184 read_unlock(&iucv_sk_list.lock);
185 return err;
186}
187
188/**
189 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
190 * @dev: AFIUCV dummy device
191 *
192 * socket clean up after freeze
193 */
194static int afiucv_pm_restore_thaw(struct device *dev)
195{
c23cad92
UB		 196 struct sock *sk;
197 struct hlist_node *node;
198
199#ifdef CONFIG_PM_DEBUG
200 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
201#endif
202 read_lock(&iucv_sk_list.lock);
203 sk_for_each(sk, node, &iucv_sk_list.head) {
c23cad92
UB		 204 switch (sk->sk_state) {
205 case IUCV_CONNECTED:
206 sk->sk_err = EPIPE;
207 sk->sk_state = IUCV_DISCONN;
208 sk->sk_state_change(sk);
209 break;
210 case IUCV_DISCONN:
c23cad92
UB		 211 case IUCV_CLOSING:
212 case IUCV_LISTEN:
213 case IUCV_BOUND:
214 case IUCV_OPEN:
215 default:
216 break;
217 }
218 }
219 read_unlock(&iucv_sk_list.lock);
220 return 0;
221}
222
47145210 223static const struct dev_pm_ops afiucv_pm_ops = {
c23cad92
UB		 224 .prepare = afiucv_pm_prepare,
225 .complete = afiucv_pm_complete,
226 .freeze = afiucv_pm_freeze,
227 .thaw = afiucv_pm_restore_thaw,
228 .restore = afiucv_pm_restore_thaw,
229};
230
231static struct device_driver af_iucv_driver = {
232 .owner = THIS_MODULE,
233 .name = "afiucv",
6fcd61f7 234 .bus = NULL,
c23cad92
UB		 235 .pm = &afiucv_pm_ops,
236};
237
238/* dummy device used as trigger for PM functions */
239static struct device *af_iucv_dev;
240
b8942e3b
HB		 241/**
242 * iucv_msg_length() - Returns the length of an iucv message.
243 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
244 *
245 * The function returns the length of the specified iucv message @msg of data
246 * stored in a buffer and of data stored in the parameter list (PRMDATA).
247 *
248 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
249 * data:
250 * PRMDATA[0..6] socket data (max 7 bytes);
251 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
252 *
25985edc 253 * The socket data length is computed by subtracting the socket data length
b8942e3b
HB		 254 * value from 0xFF.
255 * If the socket data len is greater 7, then PRMDATA can be used for special
256 * notifications (see iucv_sock_shutdown); and further,
257 * if the socket data len is > 7, the function returns 8.
258 *
259 * Use this function to allocate socket buffers to store iucv message data.
260 */
261static inline size_t iucv_msg_length(struct iucv_message *msg)
262{
263 size_t datalen;
264
265 if (msg->flags & IUCV_IPRMDATA) {
266 datalen = 0xff - msg->rmmsg[7];
267 return (datalen < 8) ? datalen : 8;
268 }
269 return msg->length;
270}
271
0ea920d2
HB		 272/**
273 * iucv_sock_in_state() - check for specific states
274 * @sk: sock structure
275 * @state: first iucv sk state
276 * @state: second iucv sk state
277 *
278 * Returns true if the socket in either in the first or second state.
279 */
280static int iucv_sock_in_state(struct sock *sk, int state, int state2)
281{
282 return (sk->sk_state == state || sk->sk_state == state2);
283}
284
285/**
286 * iucv_below_msglim() - function to check if messages can be sent
287 * @sk: sock structure
288 *
289 * Returns true if the send queue length is lower than the message limit.
290 * Always returns true if the socket is not connected (no iucv path for
291 * checking the message limit).
292 */
293static inline int iucv_below_msglim(struct sock *sk)
294{
295 struct iucv_sock *iucv = iucv_sk(sk);
296
297 if (sk->sk_state != IUCV_CONNECTED)
298 return 1;
3881ac44
UB		 299 if (iucv->transport == AF_IUCV_TRANS_IUCV)
300 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
301 else
302 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
303 (atomic_read(&iucv->pendings) <= 0));
0ea920d2
HB		 304}
305
306/**
307 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
308 */
309static void iucv_sock_wake_msglim(struct sock *sk)
310{
43815482
ED		 311 struct socket_wq *wq;
312
313 rcu_read_lock();
314 wq = rcu_dereference(sk->sk_wq);
315 if (wq_has_sleeper(wq))
316 wake_up_interruptible_all(&wq->wait);
0ea920d2 317 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
43815482 318 rcu_read_unlock();
0ea920d2
HB		 319}
320
3881ac44
UB		 321/**
322 * afiucv_hs_send() - send a message through HiperSockets transport
323 */
324static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
325 struct sk_buff *skb, u8 flags)
326{
3881ac44
UB		 327 struct iucv_sock *iucv = iucv_sk(sock);
328 struct af_iucv_trans_hdr *phs_hdr;
329 struct sk_buff *nskb;
330 int err, confirm_recv = 0;
331
332 memset(skb->head, 0, ETH_HLEN);
333 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
334 sizeof(struct af_iucv_trans_hdr));
335 skb_reset_mac_header(skb);
336 skb_reset_network_header(skb);
337 skb_push(skb, ETH_HLEN);
338 skb_reset_mac_header(skb);
339 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
340
341 phs_hdr->magic = ETH_P_AF_IUCV;
342 phs_hdr->version = 1;
343 phs_hdr->flags = flags;
344 if (flags == AF_IUCV_FLAG_SYN)
345 phs_hdr->window = iucv->msglimit;
346 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
347 confirm_recv = atomic_read(&iucv->msg_recv);
348 phs_hdr->window = confirm_recv;
349 if (confirm_recv)
350 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
351 }
352 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
353 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
354 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
355 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
356 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
357 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
358 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
359 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
360 if (imsg)
361 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
362
800c5eb7 363 skb->dev = iucv->hs_dev;
3881ac44
UB		 364 if (!skb->dev)
365 return -ENODEV;
800c5eb7 366 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
3881ac44
UB		 367 return -ENETDOWN;
368 if (skb->len > skb->dev->mtu) {
369 if (sock->sk_type == SOCK_SEQPACKET)
370 return -EMSGSIZE;
371 else
372 skb_trim(skb, skb->dev->mtu);
373 }
374 skb->protocol = ETH_P_AF_IUCV;
3881ac44
UB		 375 nskb = skb_clone(skb, GFP_ATOMIC);
376 if (!nskb)
377 return -ENOMEM;
378 skb_queue_tail(&iucv->send_skb_q, nskb);
379 err = dev_queue_xmit(skb);
800c5eb7 380 if (net_xmit_eval(err)) {
3881ac44
UB		 381 skb_unlink(nskb, &iucv->send_skb_q);
382 kfree_skb(nskb);
383 } else {
384 atomic_sub(confirm_recv, &iucv->msg_recv);
385 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
386 }
800c5eb7 387 return net_xmit_eval(err);
3881ac44
UB		 388}
389
eac3731b
JH		 390static struct sock *__iucv_get_sock_by_name(char *nm)
391{
392 struct sock *sk;
393 struct hlist_node *node;
394
395 sk_for_each(sk, node, &iucv_sk_list.head)
396 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
397 return sk;
398
399 return NULL;
400}
401
402static void iucv_sock_destruct(struct sock *sk)
403{
404 skb_queue_purge(&sk->sk_receive_queue);
82492a35
UB		 405 skb_queue_purge(&sk->sk_error_queue);
406
407 sk_mem_reclaim(sk);
408
409 if (!sock_flag(sk, SOCK_DEAD)) {
410 pr_err("Attempt to release alive iucv socket %p\n", sk);
411 return;
412 }
413
414 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
415 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
416 WARN_ON(sk->sk_wmem_queued);
417 WARN_ON(sk->sk_forward_alloc);
eac3731b
JH		 418}
419
420/* Cleanup Listen */
421static void iucv_sock_cleanup_listen(struct sock *parent)
422{
423 struct sock *sk;
424
425 /* Close non-accepted connections */
426 while ((sk = iucv_accept_dequeue(parent, NULL))) {
427 iucv_sock_close(sk);
428 iucv_sock_kill(sk);
429 }
430
431 parent->sk_state = IUCV_CLOSED;
eac3731b
JH		 432}
433
7514bab0 434/* Kill socket (only if zapped and orphaned) */
eac3731b
JH		 435static void iucv_sock_kill(struct sock *sk)
436{
437 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
438 return;
439
440 iucv_sock_unlink(&iucv_sk_list, sk);
441 sock_set_flag(sk, SOCK_DEAD);
442 sock_put(sk);
443}
444
7d316b94
UB		 445/* Terminate an IUCV path */
446static void iucv_sever_path(struct sock *sk, int with_user_data)
447{
448 unsigned char user_data[16];
449 struct iucv_sock *iucv = iucv_sk(sk);
450 struct iucv_path *path = iucv->path;
451
452 if (iucv->path) {
453 iucv->path = NULL;
454 if (with_user_data) {
455 low_nmcpy(user_data, iucv->src_name);
456 high_nmcpy(user_data, iucv->dst_name);
457 ASCEBC(user_data, sizeof(user_data));
458 pr_iucv->path_sever(path, user_data);
459 } else
460 pr_iucv->path_sever(path, NULL);
461 iucv_path_free(path);
462 }
463}
464
9fbd87d4
UB		 465/* Send FIN through an IUCV socket for HIPER transport */
466static int iucv_send_ctrl(struct sock *sk, u8 flags)
467{
468 int err = 0;
469 int blen;
470 struct sk_buff *skb;
471
472 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
473 skb = sock_alloc_send_skb(sk, blen, 1, &err);
474 if (skb) {
475 skb_reserve(skb, blen);
476 err = afiucv_hs_send(NULL, sk, skb, flags);
477 }
478 return err;
479}
480
eac3731b
JH		 481/* Close an IUCV socket */
482static void iucv_sock_close(struct sock *sk)
483{
eac3731b 484 struct iucv_sock *iucv = iucv_sk(sk);
561e0360 485 unsigned long timeo;
800c5eb7 486 int err = 0;
eac3731b 487
eac3731b
JH		 488 lock_sock(sk);
489
da99f056 490 switch (sk->sk_state) {
eac3731b
JH		 491 case IUCV_LISTEN:
492 iucv_sock_cleanup_listen(sk);
493 break;
494
495 case IUCV_CONNECTED:
3881ac44 496 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
9fbd87d4 497 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
3881ac44
UB		 498 sk->sk_state = IUCV_DISCONN;
499 sk->sk_state_change(sk);
500 }
816abbad 501 case IUCV_DISCONN: /* fall through */
561e0360
JH		 502 sk->sk_state = IUCV_CLOSING;
503 sk->sk_state_change(sk);
504
800c5eb7 505 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
561e0360
JH		 506 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
507 timeo = sk->sk_lingertime;
508 else
509 timeo = IUCV_DISCONN_TIMEOUT;
9f6298a6 510 iucv_sock_wait(sk,
0ea920d2
HB		 511 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
512 timeo);
561e0360
JH		 513 }
514
bbe188c8 515 case IUCV_CLOSING: /* fall through */
561e0360
JH		 516 sk->sk_state = IUCV_CLOSED;
517 sk->sk_state_change(sk);
518
eac3731b
JH		 519 sk->sk_err = ECONNRESET;
520 sk->sk_state_change(sk);
521
800c5eb7 522 skb_queue_purge(&iucv->send_skb_q);
561e0360 523 skb_queue_purge(&iucv->backlog_skb_q);
eac3731b 524
7d316b94
UB		 525 default: /* fall through */
526 iucv_sever_path(sk, 1);
3ff50b79 527 }
eac3731b 528
800c5eb7
UB		 529 if (iucv->hs_dev) {
530 dev_put(iucv->hs_dev);
531 iucv->hs_dev = NULL;
532 sk->sk_bound_dev_if = 0;
533 }
534
7514bab0
HB		 535 /* mark socket for deletion by iucv_sock_kill() */
536 sock_set_flag(sk, SOCK_ZAPPED);
537
eac3731b 538 release_sock(sk);
eac3731b
JH		 539}
540
541static void iucv_sock_init(struct sock *sk, struct sock *parent)
542{
543 if (parent)
544 sk->sk_type = parent->sk_type;
545}
546
547static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
548{
549 struct sock *sk;
493d3971 550 struct iucv_sock *iucv;
eac3731b 551
6257ff21 552 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
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
JH		 613
614 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
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
eac3731b
JH		 694/* Bind an unbound socket */
695static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
696 int addr_len)
697{
698 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
699 struct sock *sk = sock->sk;
700 struct iucv_sock *iucv;
3881ac44
UB		 701 int err = 0;
702 struct net_device *dev;
703 char uid[9];
eac3731b
JH		 704
705 /* Verify the input sockaddr */
706 if (!addr || addr->sa_family != AF_IUCV)
707 return -EINVAL;
708
709 lock_sock(sk);
710 if (sk->sk_state != IUCV_OPEN) {
711 err = -EBADFD;
712 goto done;
713 }
714
715 write_lock_bh(&iucv_sk_list.lock);
716
717 iucv = iucv_sk(sk);
718 if (__iucv_get_sock_by_name(sa->siucv_name)) {
719 err = -EADDRINUSE;
720 goto done_unlock;
721 }
3881ac44 722 if (iucv->path)
eac3731b 723 goto done_unlock;
eac3731b
JH		 724
725 /* Bind the socket */
3881ac44
UB		 726 if (pr_iucv)
727 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
728 goto vm_bind; /* VM IUCV transport */
eac3731b 729
3881ac44
UB		 730 /* try hiper transport */
731 memcpy(uid, sa->siucv_user_id, sizeof(uid));
732 ASCEBC(uid, 8);
733 rcu_read_lock();
734 for_each_netdev_rcu(&init_net, dev) {
735 if (!memcmp(dev->perm_addr, uid, 8)) {
736 memcpy(iucv->src_name, sa->siucv_name, 8);
737 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
816abbad 738 sk->sk_bound_dev_if = dev->ifindex;
800c5eb7
UB		 739 iucv->hs_dev = dev;
740 dev_hold(dev);
3881ac44
UB		 741 sk->sk_state = IUCV_BOUND;
742 iucv->transport = AF_IUCV_TRANS_HIPER;
743 if (!iucv->msglimit)
744 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
745 rcu_read_unlock();
746 goto done_unlock;
747 }
748 }
749 rcu_read_unlock();
750vm_bind:
751 if (pr_iucv) {
752 /* use local userid for backward compat */
753 memcpy(iucv->src_name, sa->siucv_name, 8);
754 memcpy(iucv->src_user_id, iucv_userid, 8);
755 sk->sk_state = IUCV_BOUND;
756 iucv->transport = AF_IUCV_TRANS_IUCV;
757 if (!iucv->msglimit)
758 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
759 goto done_unlock;
760 }
761 /* found no dev to bind */
762 err = -ENODEV;
eac3731b
JH		 763done_unlock:
764 /* Release the socket list lock */
765 write_unlock_bh(&iucv_sk_list.lock);
766done:
767 release_sock(sk);
768 return err;
769}
770
771/* Automatically bind an unbound socket */
772static int iucv_sock_autobind(struct sock *sk)
773{
774 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 775 char name[12];
776 int err = 0;
777
aac6399c 778 if (unlikely(!pr_iucv))
eac3731b
JH		 779 return -EPROTO;
780
aac6399c 781 memcpy(iucv->src_user_id, iucv_userid, 8);
eac3731b
JH		 782
783 write_lock_bh(&iucv_sk_list.lock);
784
785 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
786 while (__iucv_get_sock_by_name(name)) {
787 sprintf(name, "%08x",
788 atomic_inc_return(&iucv_sk_list.autobind_name));
789 }
790
791 write_unlock_bh(&iucv_sk_list.lock);
792
793 memcpy(&iucv->src_name, name, 8);
794
3881ac44
UB		 795 if (!iucv->msglimit)
796 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
797
eac3731b
JH		 798 return err;
799}
800
3881ac44 801static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
eac3731b
JH		 802{
803 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
804 struct sock *sk = sock->sk;
493d3971 805 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 806 unsigned char user_data[16];
807 int err;
808
eac3731b 809 high_nmcpy(user_data, sa->siucv_name);
493d3971 810 low_nmcpy(user_data, iucv->src_name);
eac3731b
JH		 811 ASCEBC(user_data, sizeof(user_data));
812
eac3731b 813 /* Create path. */
09488e2e 814 iucv->path = iucv_path_alloc(iucv->msglimit,
b8942e3b 815 IUCV_IPRMDATA, GFP_KERNEL);
d4444722
UB		 816 if (!iucv->path) {
817 err = -ENOMEM;
818 goto done;
819 }
6fcd61f7
FB		 820 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
821 sa->siucv_user_id, NULL, user_data,
822 sk);
eac3731b
JH		 823 if (err) {
824 iucv_path_free(iucv->path);
825 iucv->path = NULL;
55cdea9e
HB		 826 switch (err) {
827 case 0x0b: /* Target communicator is not logged on */
828 err = -ENETUNREACH;
829 break;
830 case 0x0d: /* Max connections for this guest exceeded */
831 case 0x0e: /* Max connections for target guest exceeded */
832 err = -EAGAIN;
833 break;
834 case 0x0f: /* Missing IUCV authorization */
835 err = -EACCES;
836 break;
837 default:
838 err = -ECONNREFUSED;
839 break;
840 }
eac3731b 841 }
3881ac44
UB		 842done:
843 return err;
844}
eac3731b 845
3881ac44
UB		 846/* Connect an unconnected socket */
847static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
848 int alen, int flags)
849{
850 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
851 struct sock *sk = sock->sk;
852 struct iucv_sock *iucv = iucv_sk(sk);
853 int err;
854
855 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
856 return -EINVAL;
857
858 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
859 return -EBADFD;
860
861 if (sk->sk_state == IUCV_OPEN &&
862 iucv->transport == AF_IUCV_TRANS_HIPER)
863 return -EBADFD; /* explicit bind required */
864
865 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
866 return -EINVAL;
867
868 if (sk->sk_state == IUCV_OPEN) {
869 err = iucv_sock_autobind(sk);
870 if (unlikely(err))
871 return err;
872 }
873
874 lock_sock(sk);
875
876 /* Set the destination information */
877 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
878 memcpy(iucv->dst_name, sa->siucv_name, 8);
879
880 if (iucv->transport == AF_IUCV_TRANS_HIPER)
9fbd87d4 881 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
3881ac44
UB		 882 else
883 err = afiucv_path_connect(sock, addr);
884 if (err)
885 goto done;
886
887 if (sk->sk_state != IUCV_CONNECTED)
0ea920d2
HB		 888 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
889 IUCV_DISCONN),
890 sock_sndtimeo(sk, flags & O_NONBLOCK));
eac3731b 891
3881ac44 892 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
b8942e3b 893 err = -ECONNREFUSED;
18becbc5 894
7d316b94
UB		 895 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
896 iucv_sever_path(sk, 0);
18becbc5 897
eac3731b
JH		 898done:
899 release_sock(sk);
900 return err;
901}
902
903/* Move a socket into listening state. */
904static int iucv_sock_listen(struct socket *sock, int backlog)
905{
906 struct sock *sk = sock->sk;
907 int err;
908
909 lock_sock(sk);
910
911 err = -EINVAL;
aa8e71f5
HB		 912 if (sk->sk_state != IUCV_BOUND)
913 goto done;
914
915 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
eac3731b
JH		 916 goto done;
917
918 sk->sk_max_ack_backlog = backlog;
919 sk->sk_ack_backlog = 0;
920 sk->sk_state = IUCV_LISTEN;
921 err = 0;
922
923done:
924 release_sock(sk);
925 return err;
926}
927
928/* Accept a pending connection */
929static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
930 int flags)
931{
932 DECLARE_WAITQUEUE(wait, current);
933 struct sock *sk = sock->sk, *nsk;
934 long timeo;
935 int err = 0;
936
561e0360 937 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
eac3731b
JH		 938
939 if (sk->sk_state != IUCV_LISTEN) {
940 err = -EBADFD;
941 goto done;
942 }
943
944 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
945
946 /* Wait for an incoming connection */
aa395145 947 add_wait_queue_exclusive(sk_sleep(sk), &wait);
da99f056 948 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
eac3731b
JH		 949 set_current_state(TASK_INTERRUPTIBLE);
950 if (!timeo) {
951 err = -EAGAIN;
952 break;
953 }
954
955 release_sock(sk);
956 timeo = schedule_timeout(timeo);
561e0360 957 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
eac3731b
JH		 958
959 if (sk->sk_state != IUCV_LISTEN) {
960 err = -EBADFD;
961 break;
962 }
963
964 if (signal_pending(current)) {
965 err = sock_intr_errno(timeo);
966 break;
967 }
968 }
969
970 set_current_state(TASK_RUNNING);
aa395145 971 remove_wait_queue(sk_sleep(sk), &wait);
eac3731b
JH		 972
973 if (err)
974 goto done;
975
976 newsock->state = SS_CONNECTED;
977
978done:
979 release_sock(sk);
980 return err;
981}
982
983static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
984 int *len, int peer)
985{
986 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
987 struct sock *sk = sock->sk;
493d3971 988 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 989
990 addr->sa_family = AF_IUCV;
991 *len = sizeof(struct sockaddr_iucv);
992
993 if (peer) {
493d3971
UB		 994 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
995 memcpy(siucv->siucv_name, iucv->dst_name, 8);
eac3731b 996 } else {
493d3971
UB		 997 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
998 memcpy(siucv->siucv_name, iucv->src_name, 8);
eac3731b
JH		 999 }
1000 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1001 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
493d3971 1002 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
eac3731b
JH		 1003
1004 return 0;
1005}
1006
b8942e3b
HB		 1007/**
1008 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1009 * @path: IUCV path
1010 * @msg: Pointer to a struct iucv_message
1011 * @skb: The socket data to send, skb->len MUST BE <= 7
1012 *
1013 * Send the socket data in the parameter list in the iucv message
1014 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1015 * list and the socket data len at index 7 (last byte).
1016 * See also iucv_msg_length().
1017 *
1018 * Returns the error code from the iucv_message_send() call.
1019 */
1020static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1021 struct sk_buff *skb)
1022{
1023 u8 prmdata[8];
1024
1025 memcpy(prmdata, (void *) skb->data, skb->len);
1026 prmdata[7] = 0xff - (u8) skb->len;
6fcd61f7 1027 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
b8942e3b
HB		 1028 (void *) prmdata, 8);
1029}
1030
eac3731b
JH		 1031static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1032 struct msghdr *msg, size_t len)
1033{
1034 struct sock *sk = sock->sk;
1035 struct iucv_sock *iucv = iucv_sk(sk);
1036 struct sk_buff *skb;
1037 struct iucv_message txmsg;
44b1e6b5
HB		 1038 struct cmsghdr *cmsg;
1039 int cmsg_done;
0ea920d2 1040 long timeo;
8f7c502c
UB		 1041 char user_id[9];
1042 char appl_id[9];
eac3731b 1043 int err;
0ea920d2 1044 int noblock = msg->msg_flags & MSG_DONTWAIT;
eac3731b
JH		 1045
1046 err = sock_error(sk);
1047 if (err)
1048 return err;
1049
1050 if (msg->msg_flags & MSG_OOB)
1051 return -EOPNOTSUPP;
1052
aa8e71f5
HB		 1053 /* SOCK_SEQPACKET: we do not support segmented records */
1054 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1055 return -EOPNOTSUPP;
1056
eac3731b
JH		 1057 lock_sock(sk);
1058
1059 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1060 err = -EPIPE;
1061 goto out;
1062 }
1063
bb664f49
HB		 1064 /* Return if the socket is not in connected state */
1065 if (sk->sk_state != IUCV_CONNECTED) {
1066 err = -ENOTCONN;
1067 goto out;
1068 }
44b1e6b5 1069
bb664f49
HB		 1070 /* initialize defaults */
1071 cmsg_done = 0; /* check for duplicate headers */
1072 txmsg.class = 0;
44b1e6b5 1073
bb664f49
HB		 1074 /* iterate over control messages */
1075 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
1076 cmsg = CMSG_NXTHDR(msg, cmsg)) {
44b1e6b5 1077
bb664f49
HB		 1078 if (!CMSG_OK(msg, cmsg)) {
1079 err = -EINVAL;
1080 goto out;
1081 }
44b1e6b5 1082
bb664f49
HB		 1083 if (cmsg->cmsg_level != SOL_IUCV)
1084 continue;
44b1e6b5 1085
bb664f49
HB		 1086 if (cmsg->cmsg_type & cmsg_done) {
1087 err = -EINVAL;
1088 goto out;
1089 }
1090 cmsg_done |= cmsg->cmsg_type;
44b1e6b5 1091
bb664f49
HB		 1092 switch (cmsg->cmsg_type) {
1093 case SCM_IUCV_TRGCLS:
1094 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
44b1e6b5
HB		 1095 err = -EINVAL;
1096 goto out;
1097 }
44b1e6b5 1098
bb664f49
HB		 1099 /* set iucv message target class */
1100 memcpy(&txmsg.class,
1101 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
44b1e6b5 1102
bb664f49 1103 break;
44b1e6b5 1104
bb664f49
HB		 1105 default:
1106 err = -EINVAL;
1107 goto out;
1108 break;
44b1e6b5 1109 }
bb664f49 1110 }
44b1e6b5 1111
bb664f49
HB		 1112 /* allocate one skb for each iucv message:
1113 * this is fine for SOCK_SEQPACKET (unless we want to support
1114 * segmented records using the MSG_EOR flag), but
1115 * for SOCK_STREAM we might want to improve it in future */
3881ac44
UB		 1116 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1117 skb = sock_alloc_send_skb(sk,
1118 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1119 noblock, &err);
1120 else
1121 skb = sock_alloc_send_skb(sk, len, noblock, &err);
800c5eb7
UB		 1122 if (!skb) {
1123 err = -ENOMEM;
bb664f49 1124 goto out;
800c5eb7 1125 }
3881ac44
UB		 1126 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1127 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
bb664f49
HB		 1128 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1129 err = -EFAULT;
1130 goto fail;
1131 }
eac3731b 1132
0ea920d2
HB		 1133 /* wait if outstanding messages for iucv path has reached */
1134 timeo = sock_sndtimeo(sk, noblock);
1135 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1136 if (err)
1137 goto fail;
eac3731b 1138
0ea920d2
HB		 1139 /* return -ECONNRESET if the socket is no longer connected */
1140 if (sk->sk_state != IUCV_CONNECTED) {
1141 err = -ECONNRESET;
1142 goto fail;
1143 }
b8942e3b 1144
bb664f49
HB		 1145 /* increment and save iucv message tag for msg_completion cbk */
1146 txmsg.tag = iucv->send_tag++;
1147 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
800c5eb7 1148
3881ac44
UB		 1149 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1150 atomic_inc(&iucv->msg_sent);
1151 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1152 if (err) {
1153 atomic_dec(&iucv->msg_sent);
1154 goto fail;
1155 }
1156 goto release;
1157 }
bb664f49 1158 skb_queue_tail(&iucv->send_skb_q, skb);
b8942e3b 1159
bb664f49
HB		 1160 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1161 && skb->len <= 7) {
1162 err = iucv_send_iprm(iucv->path, &txmsg, skb);
b8942e3b 1163
bb664f49
HB		 1164 /* on success: there is no message_complete callback
1165 * for an IPRMDATA msg; remove skb from send queue */
1166 if (err == 0) {
1167 skb_unlink(skb, &iucv->send_skb_q);
1168 kfree_skb(skb);
1169 }
1170
1171 /* this error should never happen since the
1172 * IUCV_IPRMDATA path flag is set... sever path */
1173 if (err == 0x15) {
6fcd61f7 1174 pr_iucv->path_sever(iucv->path, NULL);
eac3731b
JH		 1175 skb_unlink(skb, &iucv->send_skb_q);
1176 err = -EPIPE;
1177 goto fail;
1178 }
bb664f49 1179 } else
6fcd61f7 1180 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
bb664f49
HB		 1181 (void *) skb->data, skb->len);
1182 if (err) {
1183 if (err == 3) {
1184 user_id[8] = 0;
1185 memcpy(user_id, iucv->dst_user_id, 8);
1186 appl_id[8] = 0;
1187 memcpy(appl_id, iucv->dst_name, 8);
1188 pr_err("Application %s on z/VM guest %s"
1189 " exceeds message limit\n",
1190 appl_id, user_id);
0ea920d2
HB		 1191 err = -EAGAIN;
1192 } else
1193 err = -EPIPE;
bb664f49 1194 skb_unlink(skb, &iucv->send_skb_q);
bb664f49 1195 goto fail;
eac3731b
JH		 1196 }
1197
3881ac44 1198release:
eac3731b
JH		 1199 release_sock(sk);
1200 return len;
1201
1202fail:
1203 kfree_skb(skb);
1204out:
1205 release_sock(sk);
1206 return err;
1207}
1208
bf95d20f
HB		 1209/* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1210 *
1211 * Locking: must be called with message_q.lock held
1212 */
f0703c80
UB		 1213static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1214{
1215 int dataleft, size, copied = 0;
1216 struct sk_buff *nskb;
1217
1218 dataleft = len;
1219 while (dataleft) {
1220 if (dataleft >= sk->sk_rcvbuf / 4)
1221 size = sk->sk_rcvbuf / 4;
1222 else
1223 size = dataleft;
1224
1225 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1226 if (!nskb)
1227 return -ENOMEM;
1228
44b1e6b5
HB		 1229 /* copy target class to control buffer of new skb */
1230 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1231
1232 /* copy data fragment */
f0703c80
UB		 1233 memcpy(nskb->data, skb->data + copied, size);
1234 copied += size;
1235 dataleft -= size;
1236
1237 skb_reset_transport_header(nskb);
1238 skb_reset_network_header(nskb);
1239 nskb->len = size;
1240
1241 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1242 }
1243
1244 return 0;
1245}
1246
bf95d20f
HB		 1247/* iucv_process_message() - Receive a single outstanding IUCV message
1248 *
1249 * Locking: must be called with message_q.lock held
1250 */
f0703c80
UB		 1251static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1252 struct iucv_path *path,
1253 struct iucv_message *msg)
1254{
1255 int rc;
b8942e3b
HB		 1256 unsigned int len;
1257
1258 len = iucv_msg_length(msg);
f0703c80 1259
44b1e6b5
HB		 1260 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1261 /* Note: the first 4 bytes are reserved for msg tag */
1262 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1263
b8942e3b
HB		 1264 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1265 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1266 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1267 skb->data = NULL;
1268 skb->len = 0;
1269 }
f0703c80 1270 } else {
6fcd61f7
FB		 1271 rc = pr_iucv->message_receive(path, msg,
1272 msg->flags & IUCV_IPRMDATA,
1273 skb->data, len, NULL);
f0703c80
UB		 1274 if (rc) {
1275 kfree_skb(skb);
1276 return;
1277 }
aa8e71f5
HB		 1278 /* we need to fragment iucv messages for SOCK_STREAM only;
1279 * for SOCK_SEQPACKET, it is only relevant if we support
1280 * record segmentation using MSG_EOR (see also recvmsg()) */
1281 if (sk->sk_type == SOCK_STREAM &&
1282 skb->truesize >= sk->sk_rcvbuf / 4) {
b8942e3b 1283 rc = iucv_fragment_skb(sk, skb, len);
f0703c80
UB		 1284 kfree_skb(skb);
1285 skb = NULL;
1286 if (rc) {
6fcd61f7 1287 pr_iucv->path_sever(path, NULL);
f0703c80
UB		 1288 return;
1289 }
1290 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1291 } else {
1292 skb_reset_transport_header(skb);
1293 skb_reset_network_header(skb);
b8942e3b 1294 skb->len = len;
f0703c80
UB		 1295 }
1296 }
1297
1298 if (sock_queue_rcv_skb(sk, skb))
1299 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1300}
1301
bf95d20f
HB		 1302/* iucv_process_message_q() - Process outstanding IUCV messages
1303 *
1304 * Locking: must be called with message_q.lock held
1305 */
f0703c80
UB		 1306static void iucv_process_message_q(struct sock *sk)
1307{
1308 struct iucv_sock *iucv = iucv_sk(sk);
1309 struct sk_buff *skb;
1310 struct sock_msg_q *p, *n;
1311
1312 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
b8942e3b 1313 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
f0703c80
UB		 1314 if (!skb)
1315 break;
1316 iucv_process_message(sk, skb, p->path, &p->msg);
1317 list_del(&p->list);
1318 kfree(p);
1319 if (!skb_queue_empty(&iucv->backlog_skb_q))
1320 break;
1321 }
1322}
1323
eac3731b
JH		 1324static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1325 struct msghdr *msg, size_t len, int flags)
1326{
1327 int noblock = flags & MSG_DONTWAIT;
1328 struct sock *sk = sock->sk;
561e0360 1329 struct iucv_sock *iucv = iucv_sk(sk);
aa8e71f5 1330 unsigned int copied, rlen;
9fbd87d4 1331 struct sk_buff *skb, *rskb, *cskb;
eac3731b
JH		 1332 int err = 0;
1333
aac6399c 1334 if ((sk->sk_state == IUCV_DISCONN) &&
f0703c80
UB		 1335 skb_queue_empty(&iucv->backlog_skb_q) &&
1336 skb_queue_empty(&sk->sk_receive_queue) &&
1337 list_empty(&iucv->message_q.list))
561e0360
JH		 1338 return 0;
1339
eac3731b
JH		 1340 if (flags & (MSG_OOB))
1341 return -EOPNOTSUPP;
1342
60d3705f
HB		 1343 /* receive/dequeue next skb:
1344 * the function understands MSG_PEEK and, thus, does not dequeue skb */
eac3731b
JH		 1345 skb = skb_recv_datagram(sk, flags, noblock, &err);
1346 if (!skb) {
1347 if (sk->sk_shutdown & RCV_SHUTDOWN)
1348 return 0;
1349 return err;
1350 }
1351
aa8e71f5
HB		 1352 rlen = skb->len; /* real length of skb */
1353 copied = min_t(unsigned int, rlen, len);
82492a35
UB		 1354 if (!rlen)
1355 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
eac3731b 1356
561e0360 1357 cskb = skb;
3881ac44 1358 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
802788bf
HB		 1359 if (!(flags & MSG_PEEK))
1360 skb_queue_head(&sk->sk_receive_queue, skb);
1361 return -EFAULT;
eac3731b
JH		 1362 }
1363
aa8e71f5
HB		 1364 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1365 if (sk->sk_type == SOCK_SEQPACKET) {
1366 if (copied < rlen)
1367 msg->msg_flags |= MSG_TRUNC;
1368 /* each iucv message contains a complete record */
1369 msg->msg_flags |= MSG_EOR;
1370 }
eac3731b 1371
44b1e6b5
HB		 1372 /* create control message to store iucv msg target class:
1373 * get the trgcls from the control buffer of the skb due to
1374 * fragmentation of original iucv message. */
1375 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1376 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1377 if (err) {
1378 if (!(flags & MSG_PEEK))
1379 skb_queue_head(&sk->sk_receive_queue, skb);
1380 return err;
1381 }
1382
eac3731b
JH		 1383 /* Mark read part of skb as used */
1384 if (!(flags & MSG_PEEK)) {
eac3731b 1385
aa8e71f5
HB		 1386 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1387 if (sk->sk_type == SOCK_STREAM) {
1388 skb_pull(skb, copied);
1389 if (skb->len) {
1390 skb_queue_head(&sk->sk_receive_queue, skb);
1391 goto done;
1392 }
eac3731b
JH		 1393 }
1394
1395 kfree_skb(skb);
800c5eb7
UB		 1396 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1397 atomic_inc(&iucv->msg_recv);
1398 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1399 WARN_ON(1);
1400 iucv_sock_close(sk);
1401 return -EFAULT;
1402 }
1403 }
561e0360
JH		 1404
1405 /* Queue backlog skbs */
bf95d20f 1406 spin_lock_bh(&iucv->message_q.lock);
f0703c80 1407 rskb = skb_dequeue(&iucv->backlog_skb_q);
da99f056 1408 while (rskb) {
561e0360 1409 if (sock_queue_rcv_skb(sk, rskb)) {
f0703c80 1410 skb_queue_head(&iucv->backlog_skb_q,
561e0360
JH		 1411 rskb);
1412 break;
1413 } else {
f0703c80 1414 rskb = skb_dequeue(&iucv->backlog_skb_q);
561e0360
JH		 1415 }
1416 }
f0703c80 1417 if (skb_queue_empty(&iucv->backlog_skb_q)) {
f0703c80
UB		 1418 if (!list_empty(&iucv->message_q.list))
1419 iucv_process_message_q(sk);
3881ac44
UB		 1420 if (atomic_read(&iucv->msg_recv) >=
1421 iucv->msglimit / 2) {
9fbd87d4 1422 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
3881ac44
UB		 1423 if (err) {
1424 sk->sk_state = IUCV_DISCONN;
1425 sk->sk_state_change(sk);
1426 }
1427 }
f0703c80 1428 }
bf95d20f 1429 spin_unlock_bh(&iucv->message_q.lock);
60d3705f 1430 }
eac3731b
JH		 1431
1432done:
aa8e71f5
HB		 1433 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1434 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1435 copied = rlen;
1436
1437 return copied;
eac3731b
JH		 1438}
1439
1440static inline unsigned int iucv_accept_poll(struct sock *parent)
1441{
1442 struct iucv_sock *isk, *n;
1443 struct sock *sk;
1444
da99f056 1445 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
eac3731b
JH		 1446 sk = (struct sock *) isk;
1447
1448 if (sk->sk_state == IUCV_CONNECTED)
1449 return POLLIN | POLLRDNORM;
1450 }
1451
1452 return 0;
1453}
1454
1455unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1456 poll_table *wait)
1457{
1458 struct sock *sk = sock->sk;
1459 unsigned int mask = 0;
1460
aa395145 1461 sock_poll_wait(file, sk_sleep(sk), wait);
eac3731b
JH		 1462
1463 if (sk->sk_state == IUCV_LISTEN)
1464 return iucv_accept_poll(sk);
1465
1466 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1467 mask |= POLLERR;
1468
1469 if (sk->sk_shutdown & RCV_SHUTDOWN)
1470 mask |= POLLRDHUP;
1471
1472 if (sk->sk_shutdown == SHUTDOWN_MASK)
1473 mask |= POLLHUP;
1474
1475 if (!skb_queue_empty(&sk->sk_receive_queue) ||
da99f056 1476 (sk->sk_shutdown & RCV_SHUTDOWN))
eac3731b
JH		 1477 mask |= POLLIN | POLLRDNORM;
1478
1479 if (sk->sk_state == IUCV_CLOSED)
1480 mask |= POLLHUP;
1481
aac6399c 1482 if (sk->sk_state == IUCV_DISCONN)
561e0360
JH		 1483 mask |= POLLIN;
1484
7f1b0ea4 1485 if (sock_writeable(sk) && iucv_below_msglim(sk))
eac3731b
JH		 1486 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1487 else
1488 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1489
1490 return mask;
1491}
1492
1493static int iucv_sock_shutdown(struct socket *sock, int how)
1494{
1495 struct sock *sk = sock->sk;
1496 struct iucv_sock *iucv = iucv_sk(sk);
1497 struct iucv_message txmsg;
1498 int err = 0;
eac3731b
JH		 1499
1500 how++;
1501
1502 if ((how & ~SHUTDOWN_MASK) || !how)
1503 return -EINVAL;
1504
1505 lock_sock(sk);
da99f056 1506 switch (sk->sk_state) {
82492a35 1507 case IUCV_LISTEN:
e14ad5fa
HB		 1508 case IUCV_DISCONN:
1509 case IUCV_CLOSING:
eac3731b
JH		 1510 case IUCV_CLOSED:
1511 err = -ENOTCONN;
1512 goto fail;
eac3731b 1513 default:
eac3731b
JH		 1514 break;
1515 }
1516
1517 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
82492a35
UB		 1518 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1519 txmsg.class = 0;
1520 txmsg.tag = 0;
1521 err = pr_iucv->message_send(iucv->path, &txmsg,
1522 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1523 if (err) {
1524 switch (err) {
1525 case 1:
1526 err = -ENOTCONN;
1527 break;
1528 case 2:
1529 err = -ECONNRESET;
1530 break;
1531 default:
1532 err = -ENOTCONN;
1533 break;
1534 }
eac3731b 1535 }
82492a35
UB		 1536 } else
1537 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
eac3731b
JH		 1538 }
1539
82492a35 1540 sk->sk_shutdown |= how;
eac3731b 1541 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
82492a35
UB		 1542 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1543 err = pr_iucv->path_quiesce(iucv->path, NULL);
1544 if (err)
1545 err = -ENOTCONN;
1546/* skb_queue_purge(&sk->sk_receive_queue); */
1547 }
eac3731b
JH		 1548 skb_queue_purge(&sk->sk_receive_queue);
1549 }
1550
1551 /* Wake up anyone sleeping in poll */
1552 sk->sk_state_change(sk);
1553
1554fail:
1555 release_sock(sk);
1556 return err;
1557}
1558
1559static int iucv_sock_release(struct socket *sock)
1560{
1561 struct sock *sk = sock->sk;
1562 int err = 0;
1563
1564 if (!sk)
1565 return 0;
1566
1567 iucv_sock_close(sk);
1568
eac3731b
JH		 1569 sock_orphan(sk);
1570 iucv_sock_kill(sk);
1571 return err;
1572}
1573
9d5c5d8f
HB		 1574/* getsockopt and setsockopt */
1575static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 1576 char __user *optval, unsigned int optlen)
9d5c5d8f
HB		 1577{
1578 struct sock *sk = sock->sk;
1579 struct iucv_sock *iucv = iucv_sk(sk);
1580 int val;
1581 int rc;
1582
1583 if (level != SOL_IUCV)
1584 return -ENOPROTOOPT;
1585
1586 if (optlen < sizeof(int))
1587 return -EINVAL;
1588
1589 if (get_user(val, (int __user *) optval))
1590 return -EFAULT;
1591
1592 rc = 0;
1593
1594 lock_sock(sk);
1595 switch (optname) {
1596 case SO_IPRMDATA_MSG:
1597 if (val)
1598 iucv->flags |= IUCV_IPRMDATA;
1599 else
1600 iucv->flags &= ~IUCV_IPRMDATA;
1601 break;
09488e2e
HB		 1602 case SO_MSGLIMIT:
1603 switch (sk->sk_state) {
1604 case IUCV_OPEN:
1605 case IUCV_BOUND:
1606 if (val < 1 || val > (u16)(~0))
1607 rc = -EINVAL;
1608 else
1609 iucv->msglimit = val;
1610 break;
1611 default:
1612 rc = -EINVAL;
1613 break;
1614 }
1615 break;
9d5c5d8f
HB		 1616 default:
1617 rc = -ENOPROTOOPT;
1618 break;
1619 }
1620 release_sock(sk);
1621
1622 return rc;
1623}
1624
1625static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1626 char __user *optval, int __user *optlen)
1627{
1628 struct sock *sk = sock->sk;
1629 struct iucv_sock *iucv = iucv_sk(sk);
51363b87
UB		 1630 unsigned int val;
1631 int len;
9d5c5d8f
HB		 1632
1633 if (level != SOL_IUCV)
1634 return -ENOPROTOOPT;
1635
1636 if (get_user(len, optlen))
1637 return -EFAULT;
1638
1639 if (len < 0)
1640 return -EINVAL;
1641
1642 len = min_t(unsigned int, len, sizeof(int));
1643
1644 switch (optname) {
1645 case SO_IPRMDATA_MSG:
1646 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1647 break;
09488e2e
HB		 1648 case SO_MSGLIMIT:
1649 lock_sock(sk);
1650 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1651 : iucv->msglimit; /* default */
1652 release_sock(sk);
1653 break;
51363b87
UB		 1654 case SO_MSGSIZE:
1655 if (sk->sk_state == IUCV_OPEN)
1656 return -EBADFD;
1657 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1658 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1659 0x7fffffff;
1660 break;
9d5c5d8f
HB		 1661 default:
1662 return -ENOPROTOOPT;
1663 }
1664
1665 if (put_user(len, optlen))
1666 return -EFAULT;
1667 if (copy_to_user(optval, &val, len))
1668 return -EFAULT;
1669
1670 return 0;
1671}
1672
1673
eac3731b
JH		 1674/* Callback wrappers - called from iucv base support */
1675static int iucv_callback_connreq(struct iucv_path *path,
1676 u8 ipvmid[8], u8 ipuser[16])
1677{
1678 unsigned char user_data[16];
1679 unsigned char nuser_data[16];
1680 unsigned char src_name[8];
1681 struct hlist_node *node;
1682 struct sock *sk, *nsk;
1683 struct iucv_sock *iucv, *niucv;
1684 int err;
1685
1686 memcpy(src_name, ipuser, 8);
1687 EBCASC(src_name, 8);
1688 /* Find out if this path belongs to af_iucv. */
1689 read_lock(&iucv_sk_list.lock);
1690 iucv = NULL;
febca281 1691 sk = NULL;
eac3731b
JH		 1692 sk_for_each(sk, node, &iucv_sk_list.head)
1693 if (sk->sk_state == IUCV_LISTEN &&
1694 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1695 /*
1696 * Found a listening socket with
1697 * src_name == ipuser[0-7].
1698 */
1699 iucv = iucv_sk(sk);
1700 break;
1701 }
1702 read_unlock(&iucv_sk_list.lock);
1703 if (!iucv)
1704 /* No socket found, not one of our paths. */
1705 return -EINVAL;
1706
1707 bh_lock_sock(sk);
1708
1709 /* Check if parent socket is listening */
1710 low_nmcpy(user_data, iucv->src_name);
1711 high_nmcpy(user_data, iucv->dst_name);
1712 ASCEBC(user_data, sizeof(user_data));
1713 if (sk->sk_state != IUCV_LISTEN) {
6fcd61f7 1714 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1715 iucv_path_free(path);
eac3731b
JH		 1716 goto fail;
1717 }
1718
1719 /* Check for backlog size */
1720 if (sk_acceptq_is_full(sk)) {
6fcd61f7 1721 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1722 iucv_path_free(path);
eac3731b
JH		 1723 goto fail;
1724 }
1725
1726 /* Create the new socket */
aa8e71f5 1727 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
da99f056 1728 if (!nsk) {
6fcd61f7 1729 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1730 iucv_path_free(path);
eac3731b
JH		 1731 goto fail;
1732 }
1733
1734 niucv = iucv_sk(nsk);
1735 iucv_sock_init(nsk, sk);
1736
1737 /* Set the new iucv_sock */
1738 memcpy(niucv->dst_name, ipuser + 8, 8);
1739 EBCASC(niucv->dst_name, 8);
1740 memcpy(niucv->dst_user_id, ipvmid, 8);
1741 memcpy(niucv->src_name, iucv->src_name, 8);
1742 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1743 niucv->path = path;
1744
1745 /* Call iucv_accept */
1746 high_nmcpy(nuser_data, ipuser + 8);
1747 memcpy(nuser_data + 8, niucv->src_name, 8);
1748 ASCEBC(nuser_data + 8, 8);
1749
09488e2e
HB		 1750 /* set message limit for path based on msglimit of accepting socket */
1751 niucv->msglimit = iucv->msglimit;
1752 path->msglim = iucv->msglimit;
6fcd61f7 1753 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
da99f056 1754 if (err) {
7d316b94 1755 iucv_sever_path(nsk, 1);
65dbd7c2 1756 iucv_sock_kill(nsk);
eac3731b
JH		 1757 goto fail;
1758 }
1759
1760 iucv_accept_enqueue(sk, nsk);
1761
1762 /* Wake up accept */
1763 nsk->sk_state = IUCV_CONNECTED;
1764 sk->sk_data_ready(sk, 1);
1765 err = 0;
1766fail:
1767 bh_unlock_sock(sk);
1768 return 0;
1769}
1770
1771static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1772{
1773 struct sock *sk = path->private;
1774
1775 sk->sk_state = IUCV_CONNECTED;
1776 sk->sk_state_change(sk);
1777}
1778
1779static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1780{
1781 struct sock *sk = path->private;
561e0360 1782 struct iucv_sock *iucv = iucv_sk(sk);
f0703c80
UB		 1783 struct sk_buff *skb;
1784 struct sock_msg_q *save_msg;
1785 int len;
561e0360 1786
fe86e54e 1787 if (sk->sk_shutdown & RCV_SHUTDOWN) {
6fcd61f7 1788 pr_iucv->message_reject(path, msg);
eac3731b 1789 return;
fe86e54e 1790 }
eac3731b 1791
3fa6b5ad 1792 spin_lock(&iucv->message_q.lock);
eac3731b 1793
f0703c80
UB		 1794 if (!list_empty(&iucv->message_q.list) ||
1795 !skb_queue_empty(&iucv->backlog_skb_q))
1796 goto save_message;
1797
1798 len = atomic_read(&sk->sk_rmem_alloc);
87fb4b7b 1799 len += SKB_TRUESIZE(iucv_msg_length(msg));
f0703c80
UB		 1800 if (len > sk->sk_rcvbuf)
1801 goto save_message;
1802
b8942e3b 1803 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
f0703c80
UB		 1804 if (!skb)
1805 goto save_message;
eac3731b 1806
f0703c80 1807 iucv_process_message(sk, skb, path, msg);
3fa6b5ad 1808 goto out_unlock;
eac3731b 1809
f0703c80
UB		 1810save_message:
1811 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
d4444722 1812 if (!save_msg)
a56635a5 1813 goto out_unlock;
f0703c80
UB		 1814 save_msg->path = path;
1815 save_msg->msg = *msg;
eac3731b 1816
f0703c80 1817 list_add_tail(&save_msg->list, &iucv->message_q.list);
3fa6b5ad
HB		 1818
1819out_unlock:
f0703c80 1820 spin_unlock(&iucv->message_q.lock);
eac3731b
JH		 1821}
1822
1823static void iucv_callback_txdone(struct iucv_path *path,
1824 struct iucv_message *msg)
1825{
1826 struct sock *sk = path->private;
f2a77991 1827 struct sk_buff *this = NULL;
eac3731b
JH		 1828 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1829 struct sk_buff *list_skb = list->next;
1830 unsigned long flags;
1831
7d316b94 1832 bh_lock_sock(sk);
f2a77991 1833 if (!skb_queue_empty(list)) {
561e0360
JH		 1834 spin_lock_irqsave(&list->lock, flags);
1835
f2a77991 1836 while (list_skb != (struct sk_buff *)list) {
44b1e6b5 1837 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
f2a77991
UB		 1838 this = list_skb;
1839 break;
1840 }
561e0360 1841 list_skb = list_skb->next;
f2a77991
UB		 1842 }
1843 if (this)
1844 __skb_unlink(this, list);
561e0360
JH		 1845
1846 spin_unlock_irqrestore(&list->lock, flags);
eac3731b 1847
0ea920d2
HB		 1848 if (this) {
1849 kfree_skb(this);
1850 /* wake up any process waiting for sending */
1851 iucv_sock_wake_msglim(sk);
1852 }
561e0360 1853 }
eac3731b 1854
da99f056 1855 if (sk->sk_state == IUCV_CLOSING) {
561e0360
JH		 1856 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1857 sk->sk_state = IUCV_CLOSED;
1858 sk->sk_state_change(sk);
1859 }
1860 }
7d316b94 1861 bh_unlock_sock(sk);
eac3731b 1862
eac3731b
JH		 1863}
1864
1865static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1866{
1867 struct sock *sk = path->private;
1868
7d316b94
UB		 1869 if (sk->sk_state == IUCV_CLOSED)
1870 return;
1871
1872 bh_lock_sock(sk);
1873 iucv_sever_path(sk, 1);
aac6399c 1874 sk->sk_state = IUCV_DISCONN;
eac3731b
JH		 1875
1876 sk->sk_state_change(sk);
7d316b94 1877 bh_unlock_sock(sk);
eac3731b
JH		 1878}
1879
af88b52d
HB		 1880/* called if the other communication side shuts down its RECV direction;
1881 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1882 */
1883static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1884{
1885 struct sock *sk = path->private;
1886
1887 bh_lock_sock(sk);
1888 if (sk->sk_state != IUCV_CLOSED) {
1889 sk->sk_shutdown |= SEND_SHUTDOWN;
1890 sk->sk_state_change(sk);
1891 }
1892 bh_unlock_sock(sk);
1893}
1894
3881ac44
UB		 1895/***************** HiperSockets transport callbacks ********************/
1896static void afiucv_swap_src_dest(struct sk_buff *skb)
1897{
1898 struct af_iucv_trans_hdr *trans_hdr =
1899 (struct af_iucv_trans_hdr *)skb->data;
1900 char tmpID[8];
1901 char tmpName[8];
1902
1903 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1904 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1905 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1906 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1907 memcpy(tmpID, trans_hdr->srcUserID, 8);
1908 memcpy(tmpName, trans_hdr->srcAppName, 8);
1909 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1910 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1911 memcpy(trans_hdr->destUserID, tmpID, 8);
1912 memcpy(trans_hdr->destAppName, tmpName, 8);
1913 skb_push(skb, ETH_HLEN);
1914 memset(skb->data, 0, ETH_HLEN);
1915}
1916
1917/**
1918 * afiucv_hs_callback_syn - react on received SYN
1919 **/
1920static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1921{
1922 struct sock *nsk;
1923 struct iucv_sock *iucv, *niucv;
1924 struct af_iucv_trans_hdr *trans_hdr;
1925 int err;
1926
1927 iucv = iucv_sk(sk);
1928 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1929 if (!iucv) {
1930 /* no sock - connection refused */
1931 afiucv_swap_src_dest(skb);
1932 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1933 err = dev_queue_xmit(skb);
1934 goto out;
1935 }
1936
1937 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1938 bh_lock_sock(sk);
1939 if ((sk->sk_state != IUCV_LISTEN) ||
1940 sk_acceptq_is_full(sk) ||
1941 !nsk) {
1942 /* error on server socket - connection refused */
1943 if (nsk)
1944 sk_free(nsk);
1945 afiucv_swap_src_dest(skb);
1946 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1947 err = dev_queue_xmit(skb);
1948 bh_unlock_sock(sk);
1949 goto out;
1950 }
1951
1952 niucv = iucv_sk(nsk);
1953 iucv_sock_init(nsk, sk);
1954 niucv->transport = AF_IUCV_TRANS_HIPER;
1955 niucv->msglimit = iucv->msglimit;
1956 if (!trans_hdr->window)
1957 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1958 else
1959 niucv->msglimit_peer = trans_hdr->window;
1960 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1961 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1962 memcpy(niucv->src_name, iucv->src_name, 8);
1963 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1964 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
800c5eb7
UB		 1965 niucv->hs_dev = iucv->hs_dev;
1966 dev_hold(niucv->hs_dev);
3881ac44
UB		 1967 afiucv_swap_src_dest(skb);
1968 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1969 trans_hdr->window = niucv->msglimit;
1970 /* if receiver acks the xmit connection is established */
1971 err = dev_queue_xmit(skb);
1972 if (!err) {
1973 iucv_accept_enqueue(sk, nsk);
1974 nsk->sk_state = IUCV_CONNECTED;
1975 sk->sk_data_ready(sk, 1);
1976 } else
1977 iucv_sock_kill(nsk);
1978 bh_unlock_sock(sk);
1979
1980out:
1981 return NET_RX_SUCCESS;
1982}
1983
1984/**
1985 * afiucv_hs_callback_synack() - react on received SYN-ACK
1986 **/
1987static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1988{
1989 struct iucv_sock *iucv = iucv_sk(sk);
1990 struct af_iucv_trans_hdr *trans_hdr =
1991 (struct af_iucv_trans_hdr *)skb->data;
1992
1993 if (!iucv)
1994 goto out;
1995 if (sk->sk_state != IUCV_BOUND)
1996 goto out;
1997 bh_lock_sock(sk);
1998 iucv->msglimit_peer = trans_hdr->window;
1999 sk->sk_state = IUCV_CONNECTED;
2000 sk->sk_state_change(sk);
2001 bh_unlock_sock(sk);
2002out:
2003 kfree_skb(skb);
2004 return NET_RX_SUCCESS;
2005}
2006
2007/**
2008 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2009 **/
2010static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2011{
2012 struct iucv_sock *iucv = iucv_sk(sk);
2013
2014 if (!iucv)
2015 goto out;
2016 if (sk->sk_state != IUCV_BOUND)
2017 goto out;
2018 bh_lock_sock(sk);
2019 sk->sk_state = IUCV_DISCONN;
2020 sk->sk_state_change(sk);
2021 bh_unlock_sock(sk);
2022out:
2023 kfree_skb(skb);
2024 return NET_RX_SUCCESS;
2025}
2026
2027/**
2028 * afiucv_hs_callback_fin() - react on received FIN
2029 **/
2030static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2031{
2032 struct iucv_sock *iucv = iucv_sk(sk);
2033
2034 /* other end of connection closed */
800c5eb7
UB		 2035 if (!iucv)
2036 goto out;
2037 bh_lock_sock(sk);
2038 if (sk->sk_state == IUCV_CONNECTED) {
aac6399c 2039 sk->sk_state = IUCV_DISCONN;
3881ac44 2040 sk->sk_state_change(sk);
3881ac44 2041 }
800c5eb7
UB		 2042 bh_unlock_sock(sk);
2043out:
3881ac44
UB		 2044 kfree_skb(skb);
2045 return NET_RX_SUCCESS;
2046}
2047
2048/**
2049 * afiucv_hs_callback_win() - react on received WIN
2050 **/
2051static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2052{
2053 struct iucv_sock *iucv = iucv_sk(sk);
2054 struct af_iucv_trans_hdr *trans_hdr =
2055 (struct af_iucv_trans_hdr *)skb->data;
2056
2057 if (!iucv)
2058 return NET_RX_SUCCESS;
2059
2060 if (sk->sk_state != IUCV_CONNECTED)
2061 return NET_RX_SUCCESS;
2062
2063 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2064 iucv_sock_wake_msglim(sk);
2065 return NET_RX_SUCCESS;
2066}
2067
2068/**
2069 * afiucv_hs_callback_rx() - react on received data
2070 **/
2071static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2072{
2073 struct iucv_sock *iucv = iucv_sk(sk);
2074
2075 if (!iucv) {
2076 kfree_skb(skb);
2077 return NET_RX_SUCCESS;
2078 }
2079
2080 if (sk->sk_state != IUCV_CONNECTED) {
2081 kfree_skb(skb);
2082 return NET_RX_SUCCESS;
2083 }
2084
82492a35
UB		 2085 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2086 kfree_skb(skb);
2087 return NET_RX_SUCCESS;
2088 }
2089
3881ac44 2090 /* write stuff from iucv_msg to skb cb */
82492a35 2091 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
3881ac44
UB		 2092 kfree_skb(skb);
2093 return NET_RX_SUCCESS;
2094 }
2095 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2096 skb_reset_transport_header(skb);
2097 skb_reset_network_header(skb);
2098 spin_lock(&iucv->message_q.lock);
2099 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2100 if (sock_queue_rcv_skb(sk, skb)) {
2101 /* handle rcv queue full */
2102 skb_queue_tail(&iucv->backlog_skb_q, skb);
2103 }
2104 } else
2105 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2106 spin_unlock(&iucv->message_q.lock);
2107 return NET_RX_SUCCESS;
2108}
2109
2110/**
2111 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2112 * transport
2113 * called from netif RX softirq
2114 **/
2115static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2116 struct packet_type *pt, struct net_device *orig_dev)
2117{
2118 struct hlist_node *node;
2119 struct sock *sk;
2120 struct iucv_sock *iucv;
2121 struct af_iucv_trans_hdr *trans_hdr;
2122 char nullstring[8];
2123 int err = 0;
2124
2125 skb_pull(skb, ETH_HLEN);
2126 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2127 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2128 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2129 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2130 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2131 memset(nullstring, 0, sizeof(nullstring));
2132 iucv = NULL;
2133 sk = NULL;
2134 read_lock(&iucv_sk_list.lock);
2135 sk_for_each(sk, node, &iucv_sk_list.head) {
2136 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2137 if ((!memcmp(&iucv_sk(sk)->src_name,
2138 trans_hdr->destAppName, 8)) &&
2139 (!memcmp(&iucv_sk(sk)->src_user_id,
2140 trans_hdr->destUserID, 8)) &&
2141 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2142 (!memcmp(&iucv_sk(sk)->dst_user_id,
2143 nullstring, 8))) {
2144 iucv = iucv_sk(sk);
2145 break;
2146 }
2147 } else {
2148 if ((!memcmp(&iucv_sk(sk)->src_name,
2149 trans_hdr->destAppName, 8)) &&
2150 (!memcmp(&iucv_sk(sk)->src_user_id,
2151 trans_hdr->destUserID, 8)) &&
2152 (!memcmp(&iucv_sk(sk)->dst_name,
2153 trans_hdr->srcAppName, 8)) &&
2154 (!memcmp(&iucv_sk(sk)->dst_user_id,
2155 trans_hdr->srcUserID, 8))) {
2156 iucv = iucv_sk(sk);
2157 break;
2158 }
2159 }
2160 }
2161 read_unlock(&iucv_sk_list.lock);
2162 if (!iucv)
2163 sk = NULL;
2164
2165 /* no sock
2166 how should we send with no sock
2167 1) send without sock no send rc checking?
2168 2) introduce default sock to handle this cases
2169
2170 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2171 data -> send FIN
2172 SYN|ACK, SYN|FIN, FIN -> no action? */
2173
2174 switch (trans_hdr->flags) {
2175 case AF_IUCV_FLAG_SYN:
2176 /* connect request */
2177 err = afiucv_hs_callback_syn(sk, skb);
2178 break;
2179 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2180 /* connect request confirmed */
2181 err = afiucv_hs_callback_synack(sk, skb);
2182 break;
2183 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2184 /* connect request refused */
2185 err = afiucv_hs_callback_synfin(sk, skb);
2186 break;
2187 case (AF_IUCV_FLAG_FIN):
2188 /* close request */
2189 err = afiucv_hs_callback_fin(sk, skb);
2190 break;
2191 case (AF_IUCV_FLAG_WIN):
2192 err = afiucv_hs_callback_win(sk, skb);
800c5eb7
UB		 2193 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2194 kfree_skb(skb);
2195 break;
2196 }
82492a35
UB		 2197 /* fall through and receive non-zero length data */
2198 case (AF_IUCV_FLAG_SHT):
2199 /* shutdown request */
2200 /* fall through and receive zero length data */
3881ac44
UB		 2201 case 0:
2202 /* plain data frame */
c64d3f8f
UB		 2203 memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class,
2204 CB_TRGCLS_LEN);
3881ac44
UB		 2205 err = afiucv_hs_callback_rx(sk, skb);
2206 break;
2207 default:
2208 ;
2209 }
2210
2211 return err;
2212}
2213
2214/**
2215 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2216 * transport
2217 **/
2218static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2219 enum iucv_tx_notify n)
2220{
2221 struct sock *isk = skb->sk;
2222 struct sock *sk = NULL;
2223 struct iucv_sock *iucv = NULL;
2224 struct sk_buff_head *list;
2225 struct sk_buff *list_skb;
800c5eb7 2226 struct sk_buff *nskb;
3881ac44
UB		 2227 unsigned long flags;
2228 struct hlist_node *node;
2229
800c5eb7 2230 read_lock_irqsave(&iucv_sk_list.lock, flags);
3881ac44
UB		 2231 sk_for_each(sk, node, &iucv_sk_list.head)
2232 if (sk == isk) {
2233 iucv = iucv_sk(sk);
2234 break;
2235 }
800c5eb7 2236 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
3881ac44 2237
800c5eb7 2238 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
3881ac44
UB		 2239 return;
2240
3881ac44 2241 list = &iucv->send_skb_q;
800c5eb7 2242 spin_lock_irqsave(&list->lock, flags);
3881ac44
UB		 2243 if (skb_queue_empty(list))
2244 goto out_unlock;
800c5eb7
UB		 2245 list_skb = list->next;
2246 nskb = list_skb->next;
3881ac44
UB		 2247 while (list_skb != (struct sk_buff *)list) {
2248 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
3881ac44
UB		 2249 switch (n) {
2250 case TX_NOTIFY_OK:
800c5eb7
UB		 2251 __skb_unlink(list_skb, list);
2252 kfree_skb(list_skb);
3881ac44 2253 iucv_sock_wake_msglim(sk);
3881ac44
UB		 2254 break;
2255 case TX_NOTIFY_PENDING:
2256 atomic_inc(&iucv->pendings);
2257 break;
2258 case TX_NOTIFY_DELAYED_OK:
800c5eb7 2259 __skb_unlink(list_skb, list);
3881ac44
UB		 2260 atomic_dec(&iucv->pendings);
2261 if (atomic_read(&iucv->pendings) <= 0)
2262 iucv_sock_wake_msglim(sk);
800c5eb7 2263 kfree_skb(list_skb);
3881ac44
UB		 2264 break;
2265 case TX_NOTIFY_UNREACHABLE:
2266 case TX_NOTIFY_DELAYED_UNREACHABLE:
2267 case TX_NOTIFY_TPQFULL: /* not yet used */
2268 case TX_NOTIFY_GENERALERROR:
2269 case TX_NOTIFY_DELAYED_GENERALERROR:
800c5eb7
UB		 2270 __skb_unlink(list_skb, list);
2271 kfree_skb(list_skb);
2272 if (sk->sk_state == IUCV_CONNECTED) {
2273 sk->sk_state = IUCV_DISCONN;
2274 sk->sk_state_change(sk);
2275 }
3881ac44
UB		 2276 break;
2277 }
2278 break;
2279 }
800c5eb7
UB		 2280 list_skb = nskb;
2281 nskb = nskb->next;
3881ac44 2282 }
800c5eb7 2283out_unlock:
3881ac44
UB		 2284 spin_unlock_irqrestore(&list->lock, flags);
2285
42bd48e0
UB		 2286 if (sk->sk_state == IUCV_CLOSING) {
2287 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2288 sk->sk_state = IUCV_CLOSED;
2289 sk->sk_state_change(sk);
2290 }
2291 }
2292
3881ac44 2293}
9fbd87d4
UB		 2294
2295/*
2296 * afiucv_netdev_event: handle netdev notifier chain events
2297 */
2298static int afiucv_netdev_event(struct notifier_block *this,
2299 unsigned long event, void *ptr)
2300{
2301 struct net_device *event_dev = (struct net_device *)ptr;
2302 struct hlist_node *node;
2303 struct sock *sk;
2304 struct iucv_sock *iucv;
2305
2306 switch (event) {
2307 case NETDEV_REBOOT:
2308 case NETDEV_GOING_DOWN:
2309 sk_for_each(sk, node, &iucv_sk_list.head) {
2310 iucv = iucv_sk(sk);
2311 if ((iucv->hs_dev == event_dev) &&
2312 (sk->sk_state == IUCV_CONNECTED)) {
2313 if (event == NETDEV_GOING_DOWN)
2314 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2315 sk->sk_state = IUCV_DISCONN;
2316 sk->sk_state_change(sk);
2317 }
2318 }
2319 break;
2320 case NETDEV_DOWN:
2321 case NETDEV_UNREGISTER:
2322 default:
2323 break;
2324 }
2325 return NOTIFY_DONE;
2326}
2327
2328static struct notifier_block afiucv_netdev_notifier = {
2329 .notifier_call = afiucv_netdev_event,
2330};
2331
5708e868 2332static const struct proto_ops iucv_sock_ops = {
eac3731b
JH		 2333 .family = PF_IUCV,
2334 .owner = THIS_MODULE,
2335 .release = iucv_sock_release,
2336 .bind = iucv_sock_bind,
2337 .connect = iucv_sock_connect,
2338 .listen = iucv_sock_listen,
2339 .accept = iucv_sock_accept,
2340 .getname = iucv_sock_getname,
2341 .sendmsg = iucv_sock_sendmsg,
2342 .recvmsg = iucv_sock_recvmsg,
2343 .poll = iucv_sock_poll,
2344 .ioctl = sock_no_ioctl,
2345 .mmap = sock_no_mmap,
2346 .socketpair = sock_no_socketpair,
2347 .shutdown = iucv_sock_shutdown,
9d5c5d8f
HB		 2348 .setsockopt = iucv_sock_setsockopt,
2349 .getsockopt = iucv_sock_getsockopt,
eac3731b
JH		 2350};
2351
ec1b4cf7 2352static const struct net_proto_family iucv_sock_family_ops = {
eac3731b
JH		 2353 .family = AF_IUCV,
2354 .owner = THIS_MODULE,
2355 .create = iucv_sock_create,
2356};
2357
3881ac44
UB		 2358static struct packet_type iucv_packet_type = {
2359 .type = cpu_to_be16(ETH_P_AF_IUCV),
2360 .func = afiucv_hs_rcv,
2361};
2362
2363static int afiucv_iucv_init(void)
6fcd61f7
FB		 2364{
2365 int err;
2366
2367 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2368 if (err)
2369 goto out;
2370 /* establish dummy device */
2371 af_iucv_driver.bus = pr_iucv->bus;
2372 err = driver_register(&af_iucv_driver);
2373 if (err)
2374 goto out_iucv;
2375 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2376 if (!af_iucv_dev) {
2377 err = -ENOMEM;
2378 goto out_driver;
2379 }
2380 dev_set_name(af_iucv_dev, "af_iucv");
2381 af_iucv_dev->bus = pr_iucv->bus;
2382 af_iucv_dev->parent = pr_iucv->root;
2383 af_iucv_dev->release = (void (*)(struct device *))kfree;
2384 af_iucv_dev->driver = &af_iucv_driver;
2385 err = device_register(af_iucv_dev);
2386 if (err)
2387 goto out_driver;
2388 return 0;
2389
2390out_driver:
2391 driver_unregister(&af_iucv_driver);
2392out_iucv:
2393 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2394out:
2395 return err;
2396}
2397
da99f056 2398static int __init afiucv_init(void)
eac3731b
JH		 2399{
2400 int err;
2401
3881ac44
UB		 2402 if (MACHINE_IS_VM) {
2403 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2404 if (unlikely(err)) {
2405 WARN_ON(err);
2406 err = -EPROTONOSUPPORT;
2407 goto out;
2408 }
eac3731b 2409
3881ac44
UB		 2410 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2411 if (!pr_iucv) {
2412 printk(KERN_WARNING "iucv_if lookup failed\n");
2413 memset(&iucv_userid, 0, sizeof(iucv_userid));
2414 }
2415 } else {
2416 memset(&iucv_userid, 0, sizeof(iucv_userid));
2417 pr_iucv = NULL;
6fcd61f7
FB		 2418 }
2419
eac3731b
JH		 2420 err = proto_register(&iucv_proto, 0);
2421 if (err)
6fcd61f7 2422 goto out;
eac3731b
JH		 2423 err = sock_register(&iucv_sock_family_ops);
2424 if (err)
2425 goto out_proto;
6fcd61f7 2426
3881ac44
UB		 2427 if (pr_iucv) {
2428 err = afiucv_iucv_init();
2429 if (err)
2430 goto out_sock;
9fbd87d4
UB		 2431 } else
2432 register_netdevice_notifier(&afiucv_netdev_notifier);
3881ac44 2433 dev_add_pack(&iucv_packet_type);
eac3731b
JH		 2434 return 0;
2435
c23cad92
UB		 2436out_sock:
2437 sock_unregister(PF_IUCV);
eac3731b
JH		 2438out_proto:
2439 proto_unregister(&iucv_proto);
eac3731b 2440out:
6fcd61f7
FB		 2441 if (pr_iucv)
2442 symbol_put(iucv_if);
eac3731b
JH		 2443 return err;
2444}
2445
2446static void __exit afiucv_exit(void)
2447{
3881ac44
UB		 2448 if (pr_iucv) {
2449 device_unregister(af_iucv_dev);
2450 driver_unregister(&af_iucv_driver);
2451 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2452 symbol_put(iucv_if);
9fbd87d4
UB		 2453 } else
2454 unregister_netdevice_notifier(&afiucv_netdev_notifier);
3881ac44 2455 dev_remove_pack(&iucv_packet_type);
eac3731b
JH		 2456 sock_unregister(PF_IUCV);
2457 proto_unregister(&iucv_proto);
eac3731b
JH		 2458}
2459
2460module_init(afiucv_init);
2461module_exit(afiucv_exit);
2462
2463MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2464MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2465MODULE_VERSION(VERSION);
2466MODULE_LICENSE("GPL");
2467MODULE_ALIAS_NETPROTO(PF_IUCV);
3881ac44 2468
Linux kernel - Deliverables
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