Commit | Line | Data |
---|---|---|
eac3731b JH |
1 | /* |
2 | * linux/net/iucv/af_iucv.c | |
3 | * | |
4 | * IUCV protocol stack for Linux on zSeries | |
5 | * | |
6 | * Copyright 2006 IBM Corporation | |
7 | * | |
8 | * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/poll.h> | |
21 | #include <net/sock.h> | |
22 | #include <asm/ebcdic.h> | |
23 | #include <asm/cpcmd.h> | |
24 | #include <linux/kmod.h> | |
25 | ||
26 | #include <net/iucv/iucv.h> | |
27 | #include <net/iucv/af_iucv.h> | |
28 | ||
29 | #define CONFIG_IUCV_SOCK_DEBUG 1 | |
30 | ||
31 | #define IPRMDATA 0x80 | |
32 | #define VERSION "1.0" | |
33 | ||
34 | static char iucv_userid[80]; | |
35 | ||
36 | static struct proto_ops iucv_sock_ops; | |
37 | ||
38 | static struct proto iucv_proto = { | |
39 | .name = "AF_IUCV", | |
40 | .owner = THIS_MODULE, | |
41 | .obj_size = sizeof(struct iucv_sock), | |
42 | }; | |
43 | ||
44 | /* Call Back functions */ | |
45 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
46 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
47 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
48 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]); | |
49 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); | |
50 | ||
51 | static struct iucv_sock_list iucv_sk_list = { | |
52 | .lock = RW_LOCK_UNLOCKED, | |
53 | .autobind_name = ATOMIC_INIT(0) | |
54 | }; | |
55 | ||
56 | static struct iucv_handler af_iucv_handler = { | |
57 | .path_pending = iucv_callback_connreq, | |
58 | .path_complete = iucv_callback_connack, | |
59 | .path_severed = iucv_callback_connrej, | |
60 | .message_pending = iucv_callback_rx, | |
61 | .message_complete = iucv_callback_txdone | |
62 | }; | |
63 | ||
64 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
65 | { | |
66 | memcpy(dst, src, 8); | |
67 | } | |
68 | ||
69 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
70 | { | |
71 | memcpy(&dst[8], src, 8); | |
72 | } | |
73 | ||
74 | /* Timers */ | |
75 | static void iucv_sock_timeout(unsigned long arg) | |
76 | { | |
77 | struct sock *sk = (struct sock *)arg; | |
78 | ||
79 | bh_lock_sock(sk); | |
80 | sk->sk_err = ETIMEDOUT; | |
81 | sk->sk_state_change(sk); | |
82 | bh_unlock_sock(sk); | |
83 | ||
84 | iucv_sock_kill(sk); | |
85 | sock_put(sk); | |
86 | } | |
87 | ||
88 | static void iucv_sock_clear_timer(struct sock *sk) | |
89 | { | |
90 | sk_stop_timer(sk, &sk->sk_timer); | |
91 | } | |
92 | ||
93 | static void iucv_sock_init_timer(struct sock *sk) | |
94 | { | |
95 | init_timer(&sk->sk_timer); | |
96 | sk->sk_timer.function = iucv_sock_timeout; | |
97 | sk->sk_timer.data = (unsigned long)sk; | |
98 | } | |
99 | ||
100 | static struct sock *__iucv_get_sock_by_name(char *nm) | |
101 | { | |
102 | struct sock *sk; | |
103 | struct hlist_node *node; | |
104 | ||
105 | sk_for_each(sk, node, &iucv_sk_list.head) | |
106 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
107 | return sk; | |
108 | ||
109 | return NULL; | |
110 | } | |
111 | ||
112 | static void iucv_sock_destruct(struct sock *sk) | |
113 | { | |
114 | skb_queue_purge(&sk->sk_receive_queue); | |
115 | skb_queue_purge(&sk->sk_write_queue); | |
116 | } | |
117 | ||
118 | /* Cleanup Listen */ | |
119 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
120 | { | |
121 | struct sock *sk; | |
122 | ||
123 | /* Close non-accepted connections */ | |
124 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
125 | iucv_sock_close(sk); | |
126 | iucv_sock_kill(sk); | |
127 | } | |
128 | ||
129 | parent->sk_state = IUCV_CLOSED; | |
130 | sock_set_flag(parent, SOCK_ZAPPED); | |
131 | } | |
132 | ||
133 | /* Kill socket */ | |
134 | static void iucv_sock_kill(struct sock *sk) | |
135 | { | |
136 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
137 | return; | |
138 | ||
139 | iucv_sock_unlink(&iucv_sk_list, sk); | |
140 | sock_set_flag(sk, SOCK_DEAD); | |
141 | sock_put(sk); | |
142 | } | |
143 | ||
144 | /* Close an IUCV socket */ | |
145 | static void iucv_sock_close(struct sock *sk) | |
146 | { | |
147 | unsigned char user_data[16]; | |
148 | struct iucv_sock *iucv = iucv_sk(sk); | |
149 | int err; | |
150 | ||
151 | iucv_sock_clear_timer(sk); | |
152 | lock_sock(sk); | |
153 | ||
154 | switch(sk->sk_state) { | |
155 | case IUCV_LISTEN: | |
156 | iucv_sock_cleanup_listen(sk); | |
157 | break; | |
158 | ||
159 | case IUCV_CONNECTED: | |
160 | case IUCV_DISCONN: | |
161 | err = 0; | |
162 | if (iucv->path) { | |
163 | low_nmcpy(user_data, iucv->src_name); | |
164 | high_nmcpy(user_data, iucv->dst_name); | |
165 | ASCEBC(user_data, sizeof(user_data)); | |
166 | err = iucv_path_sever(iucv->path, user_data); | |
167 | iucv_path_free(iucv->path); | |
168 | iucv->path = NULL; | |
169 | } | |
170 | ||
171 | sk->sk_state = IUCV_CLOSED; | |
172 | sk->sk_state_change(sk); | |
173 | sk->sk_err = ECONNRESET; | |
174 | sk->sk_state_change(sk); | |
175 | ||
176 | skb_queue_purge(&iucv->send_skb_q); | |
177 | ||
178 | sock_set_flag(sk, SOCK_ZAPPED); | |
179 | break; | |
180 | ||
181 | default: | |
182 | sock_set_flag(sk, SOCK_ZAPPED); | |
183 | break; | |
184 | }; | |
185 | ||
186 | release_sock(sk); | |
187 | iucv_sock_kill(sk); | |
188 | } | |
189 | ||
190 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
191 | { | |
192 | if (parent) | |
193 | sk->sk_type = parent->sk_type; | |
194 | } | |
195 | ||
196 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
197 | { | |
198 | struct sock *sk; | |
199 | ||
200 | sk = sk_alloc(PF_IUCV, prio, &iucv_proto, 1); | |
201 | if (!sk) | |
202 | return NULL; | |
203 | ||
204 | sock_init_data(sock, sk); | |
205 | INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); | |
206 | skb_queue_head_init(&iucv_sk(sk)->send_skb_q); | |
207 | iucv_sk(sk)->send_tag = 0; | |
208 | ||
209 | sk->sk_destruct = iucv_sock_destruct; | |
210 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
211 | sk->sk_allocation = GFP_DMA; | |
212 | ||
213 | sock_reset_flag(sk, SOCK_ZAPPED); | |
214 | ||
215 | sk->sk_protocol = proto; | |
216 | sk->sk_state = IUCV_OPEN; | |
217 | ||
218 | iucv_sock_init_timer(sk); | |
219 | ||
220 | iucv_sock_link(&iucv_sk_list, sk); | |
221 | return sk; | |
222 | } | |
223 | ||
224 | /* Create an IUCV socket */ | |
225 | static int iucv_sock_create(struct socket *sock, int protocol) | |
226 | { | |
227 | struct sock *sk; | |
228 | ||
229 | if (sock->type != SOCK_STREAM) | |
230 | return -ESOCKTNOSUPPORT; | |
231 | ||
232 | sock->state = SS_UNCONNECTED; | |
233 | sock->ops = &iucv_sock_ops; | |
234 | ||
235 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
236 | if (!sk) | |
237 | return -ENOMEM; | |
238 | ||
239 | iucv_sock_init(sk, NULL); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
245 | { | |
246 | write_lock_bh(&l->lock); | |
247 | sk_add_node(sk, &l->head); | |
248 | write_unlock_bh(&l->lock); | |
249 | } | |
250 | ||
251 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
252 | { | |
253 | write_lock_bh(&l->lock); | |
254 | sk_del_node_init(sk); | |
255 | write_unlock_bh(&l->lock); | |
256 | } | |
257 | ||
258 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
259 | { | |
260 | sock_hold(sk); | |
261 | list_add_tail(&iucv_sk(sk)->accept_q, &iucv_sk(parent)->accept_q); | |
262 | iucv_sk(sk)->parent = parent; | |
263 | parent->sk_ack_backlog++; | |
264 | } | |
265 | ||
266 | void iucv_accept_unlink(struct sock *sk) | |
267 | { | |
268 | list_del_init(&iucv_sk(sk)->accept_q); | |
269 | iucv_sk(sk)->parent->sk_ack_backlog--; | |
270 | iucv_sk(sk)->parent = NULL; | |
271 | sock_put(sk); | |
272 | } | |
273 | ||
274 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
275 | { | |
276 | struct iucv_sock *isk, *n; | |
277 | struct sock *sk; | |
278 | ||
279 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q){ | |
280 | sk = (struct sock *) isk; | |
281 | lock_sock(sk); | |
282 | ||
283 | if (sk->sk_state == IUCV_CLOSED) { | |
284 | release_sock(sk); | |
285 | iucv_accept_unlink(sk); | |
286 | continue; | |
287 | } | |
288 | ||
289 | if (sk->sk_state == IUCV_CONNECTED || | |
290 | sk->sk_state == IUCV_SEVERED || | |
291 | !newsock) { | |
292 | iucv_accept_unlink(sk); | |
293 | if (newsock) | |
294 | sock_graft(sk, newsock); | |
295 | ||
296 | if (sk->sk_state == IUCV_SEVERED) | |
297 | sk->sk_state = IUCV_DISCONN; | |
298 | ||
299 | release_sock(sk); | |
300 | return sk; | |
301 | } | |
302 | ||
303 | release_sock(sk); | |
304 | } | |
305 | return NULL; | |
306 | } | |
307 | ||
308 | int iucv_sock_wait_state(struct sock *sk, int state, int state2, | |
309 | unsigned long timeo) | |
310 | { | |
311 | DECLARE_WAITQUEUE(wait, current); | |
312 | int err = 0; | |
313 | ||
314 | add_wait_queue(sk->sk_sleep, &wait); | |
315 | while (sk->sk_state != state && sk->sk_state != state2) { | |
316 | set_current_state(TASK_INTERRUPTIBLE); | |
317 | ||
318 | if (!timeo) { | |
319 | err = -EAGAIN; | |
320 | break; | |
321 | } | |
322 | ||
323 | if (signal_pending(current)) { | |
324 | err = sock_intr_errno(timeo); | |
325 | break; | |
326 | } | |
327 | ||
328 | release_sock(sk); | |
329 | timeo = schedule_timeout(timeo); | |
330 | lock_sock(sk); | |
331 | ||
332 | err = sock_error(sk); | |
333 | if (err) | |
334 | break; | |
335 | } | |
336 | set_current_state(TASK_RUNNING); | |
337 | remove_wait_queue(sk->sk_sleep, &wait); | |
338 | return err; | |
339 | } | |
340 | ||
341 | /* Bind an unbound socket */ | |
342 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
343 | int addr_len) | |
344 | { | |
345 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
346 | struct sock *sk = sock->sk; | |
347 | struct iucv_sock *iucv; | |
348 | int err; | |
349 | ||
350 | /* Verify the input sockaddr */ | |
351 | if (!addr || addr->sa_family != AF_IUCV) | |
352 | return -EINVAL; | |
353 | ||
354 | lock_sock(sk); | |
355 | if (sk->sk_state != IUCV_OPEN) { | |
356 | err = -EBADFD; | |
357 | goto done; | |
358 | } | |
359 | ||
360 | write_lock_bh(&iucv_sk_list.lock); | |
361 | ||
362 | iucv = iucv_sk(sk); | |
363 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
364 | err = -EADDRINUSE; | |
365 | goto done_unlock; | |
366 | } | |
367 | if (iucv->path) { | |
368 | err = 0; | |
369 | goto done_unlock; | |
370 | } | |
371 | ||
372 | /* Bind the socket */ | |
373 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
374 | ||
375 | /* Copy the user id */ | |
376 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
377 | sk->sk_state = IUCV_BOUND; | |
378 | err = 0; | |
379 | ||
380 | done_unlock: | |
381 | /* Release the socket list lock */ | |
382 | write_unlock_bh(&iucv_sk_list.lock); | |
383 | done: | |
384 | release_sock(sk); | |
385 | return err; | |
386 | } | |
387 | ||
388 | /* Automatically bind an unbound socket */ | |
389 | static int iucv_sock_autobind(struct sock *sk) | |
390 | { | |
391 | struct iucv_sock *iucv = iucv_sk(sk); | |
392 | char query_buffer[80]; | |
393 | char name[12]; | |
394 | int err = 0; | |
395 | ||
396 | /* Set the userid and name */ | |
397 | cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); | |
398 | if (unlikely(err)) | |
399 | return -EPROTO; | |
400 | ||
401 | memcpy(iucv->src_user_id, query_buffer, 8); | |
402 | ||
403 | write_lock_bh(&iucv_sk_list.lock); | |
404 | ||
405 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
406 | while (__iucv_get_sock_by_name(name)) { | |
407 | sprintf(name, "%08x", | |
408 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
409 | } | |
410 | ||
411 | write_unlock_bh(&iucv_sk_list.lock); | |
412 | ||
413 | memcpy(&iucv->src_name, name, 8); | |
414 | ||
415 | return err; | |
416 | } | |
417 | ||
418 | /* Connect an unconnected socket */ | |
419 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
420 | int alen, int flags) | |
421 | { | |
422 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
423 | struct sock *sk = sock->sk; | |
424 | struct iucv_sock *iucv; | |
425 | unsigned char user_data[16]; | |
426 | int err; | |
427 | ||
428 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
429 | return -EINVAL; | |
430 | ||
431 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
432 | return -EBADFD; | |
433 | ||
434 | if (sk->sk_type != SOCK_STREAM) | |
435 | return -EINVAL; | |
436 | ||
437 | iucv = iucv_sk(sk); | |
438 | ||
439 | if (sk->sk_state == IUCV_OPEN) { | |
440 | err = iucv_sock_autobind(sk); | |
441 | if (unlikely(err)) | |
442 | return err; | |
443 | } | |
444 | ||
445 | lock_sock(sk); | |
446 | ||
447 | /* Set the destination information */ | |
448 | memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); | |
449 | memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); | |
450 | ||
451 | high_nmcpy(user_data, sa->siucv_name); | |
452 | low_nmcpy(user_data, iucv_sk(sk)->src_name); | |
453 | ASCEBC(user_data, sizeof(user_data)); | |
454 | ||
455 | iucv = iucv_sk(sk); | |
456 | /* Create path. */ | |
457 | iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT, | |
458 | IPRMDATA, GFP_KERNEL); | |
459 | err = iucv_path_connect(iucv->path, &af_iucv_handler, | |
460 | sa->siucv_user_id, NULL, user_data, sk); | |
461 | if (err) { | |
462 | iucv_path_free(iucv->path); | |
463 | iucv->path = NULL; | |
464 | err = -ECONNREFUSED; | |
465 | goto done; | |
466 | } | |
467 | ||
468 | if (sk->sk_state != IUCV_CONNECTED) { | |
469 | err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN, | |
470 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
471 | } | |
472 | ||
473 | if (sk->sk_state == IUCV_DISCONN) { | |
474 | release_sock(sk); | |
475 | return -ECONNREFUSED; | |
476 | } | |
477 | done: | |
478 | release_sock(sk); | |
479 | return err; | |
480 | } | |
481 | ||
482 | /* Move a socket into listening state. */ | |
483 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
484 | { | |
485 | struct sock *sk = sock->sk; | |
486 | int err; | |
487 | ||
488 | lock_sock(sk); | |
489 | ||
490 | err = -EINVAL; | |
491 | if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM) | |
492 | goto done; | |
493 | ||
494 | sk->sk_max_ack_backlog = backlog; | |
495 | sk->sk_ack_backlog = 0; | |
496 | sk->sk_state = IUCV_LISTEN; | |
497 | err = 0; | |
498 | ||
499 | done: | |
500 | release_sock(sk); | |
501 | return err; | |
502 | } | |
503 | ||
504 | /* Accept a pending connection */ | |
505 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
506 | int flags) | |
507 | { | |
508 | DECLARE_WAITQUEUE(wait, current); | |
509 | struct sock *sk = sock->sk, *nsk; | |
510 | long timeo; | |
511 | int err = 0; | |
512 | ||
513 | lock_sock(sk); | |
514 | ||
515 | if (sk->sk_state != IUCV_LISTEN) { | |
516 | err = -EBADFD; | |
517 | goto done; | |
518 | } | |
519 | ||
520 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
521 | ||
522 | /* Wait for an incoming connection */ | |
523 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
524 | while (!(nsk = iucv_accept_dequeue(sk, newsock))){ | |
525 | set_current_state(TASK_INTERRUPTIBLE); | |
526 | if (!timeo) { | |
527 | err = -EAGAIN; | |
528 | break; | |
529 | } | |
530 | ||
531 | release_sock(sk); | |
532 | timeo = schedule_timeout(timeo); | |
533 | lock_sock(sk); | |
534 | ||
535 | if (sk->sk_state != IUCV_LISTEN) { | |
536 | err = -EBADFD; | |
537 | break; | |
538 | } | |
539 | ||
540 | if (signal_pending(current)) { | |
541 | err = sock_intr_errno(timeo); | |
542 | break; | |
543 | } | |
544 | } | |
545 | ||
546 | set_current_state(TASK_RUNNING); | |
547 | remove_wait_queue(sk->sk_sleep, &wait); | |
548 | ||
549 | if (err) | |
550 | goto done; | |
551 | ||
552 | newsock->state = SS_CONNECTED; | |
553 | ||
554 | done: | |
555 | release_sock(sk); | |
556 | return err; | |
557 | } | |
558 | ||
559 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
560 | int *len, int peer) | |
561 | { | |
562 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
563 | struct sock *sk = sock->sk; | |
564 | ||
565 | addr->sa_family = AF_IUCV; | |
566 | *len = sizeof(struct sockaddr_iucv); | |
567 | ||
568 | if (peer) { | |
569 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); | |
570 | memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); | |
571 | } else { | |
572 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8); | |
573 | memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); | |
574 | } | |
575 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
576 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
577 | memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
583 | struct msghdr *msg, size_t len) | |
584 | { | |
585 | struct sock *sk = sock->sk; | |
586 | struct iucv_sock *iucv = iucv_sk(sk); | |
587 | struct sk_buff *skb; | |
588 | struct iucv_message txmsg; | |
589 | int err; | |
590 | ||
591 | err = sock_error(sk); | |
592 | if (err) | |
593 | return err; | |
594 | ||
595 | if (msg->msg_flags & MSG_OOB) | |
596 | return -EOPNOTSUPP; | |
597 | ||
598 | lock_sock(sk); | |
599 | ||
600 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
601 | err = -EPIPE; | |
602 | goto out; | |
603 | } | |
604 | ||
605 | if (sk->sk_state == IUCV_CONNECTED){ | |
606 | if(!(skb = sock_alloc_send_skb(sk, len, | |
607 | msg->msg_flags & MSG_DONTWAIT, | |
608 | &err))) | |
609 | return err; | |
610 | ||
611 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)){ | |
612 | err = -EFAULT; | |
613 | goto fail; | |
614 | } | |
615 | ||
616 | txmsg.class = 0; | |
617 | txmsg.tag = iucv->send_tag++; | |
618 | memcpy(skb->cb, &txmsg.tag, 4); | |
619 | skb_queue_tail(&iucv->send_skb_q, skb); | |
620 | err = iucv_message_send(iucv->path, &txmsg, 0, 0, | |
621 | (void *) skb->data, skb->len); | |
622 | if (err) { | |
623 | if (err == 3) | |
624 | printk(KERN_ERR "AF_IUCV msg limit exceeded\n"); | |
625 | skb_unlink(skb, &iucv->send_skb_q); | |
626 | err = -EPIPE; | |
627 | goto fail; | |
628 | } | |
629 | ||
630 | } else { | |
631 | err = -ENOTCONN; | |
632 | goto out; | |
633 | } | |
634 | ||
635 | release_sock(sk); | |
636 | return len; | |
637 | ||
638 | fail: | |
639 | kfree_skb(skb); | |
640 | out: | |
641 | release_sock(sk); | |
642 | return err; | |
643 | } | |
644 | ||
645 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
646 | struct msghdr *msg, size_t len, int flags) | |
647 | { | |
648 | int noblock = flags & MSG_DONTWAIT; | |
649 | struct sock *sk = sock->sk; | |
650 | int target, copied = 0; | |
651 | struct sk_buff *skb; | |
652 | int err = 0; | |
653 | ||
654 | if (flags & (MSG_OOB)) | |
655 | return -EOPNOTSUPP; | |
656 | ||
657 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
658 | ||
659 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
660 | if (!skb) { | |
661 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
662 | return 0; | |
663 | return err; | |
664 | } | |
665 | ||
666 | copied = min_t(unsigned int, skb->len, len); | |
667 | ||
668 | if (memcpy_toiovec(msg->msg_iov, skb->data, copied)) { | |
669 | skb_queue_head(&sk->sk_receive_queue, skb); | |
670 | if (copied == 0) | |
671 | return -EFAULT; | |
672 | } | |
673 | ||
674 | len -= copied; | |
675 | ||
676 | /* Mark read part of skb as used */ | |
677 | if (!(flags & MSG_PEEK)) { | |
678 | skb_pull(skb, copied); | |
679 | ||
680 | if (skb->len) { | |
681 | skb_queue_head(&sk->sk_receive_queue, skb); | |
682 | goto done; | |
683 | } | |
684 | ||
685 | kfree_skb(skb); | |
686 | } else | |
687 | skb_queue_head(&sk->sk_receive_queue, skb); | |
688 | ||
689 | done: | |
690 | return err ? : copied; | |
691 | } | |
692 | ||
693 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
694 | { | |
695 | struct iucv_sock *isk, *n; | |
696 | struct sock *sk; | |
697 | ||
698 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q){ | |
699 | sk = (struct sock *) isk; | |
700 | ||
701 | if (sk->sk_state == IUCV_CONNECTED) | |
702 | return POLLIN | POLLRDNORM; | |
703 | } | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
708 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
709 | poll_table *wait) | |
710 | { | |
711 | struct sock *sk = sock->sk; | |
712 | unsigned int mask = 0; | |
713 | ||
714 | poll_wait(file, sk->sk_sleep, wait); | |
715 | ||
716 | if (sk->sk_state == IUCV_LISTEN) | |
717 | return iucv_accept_poll(sk); | |
718 | ||
719 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
720 | mask |= POLLERR; | |
721 | ||
722 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
723 | mask |= POLLRDHUP; | |
724 | ||
725 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
726 | mask |= POLLHUP; | |
727 | ||
728 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
729 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
730 | mask |= POLLIN | POLLRDNORM; | |
731 | ||
732 | if (sk->sk_state == IUCV_CLOSED) | |
733 | mask |= POLLHUP; | |
734 | ||
735 | if (sock_writeable(sk)) | |
736 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
737 | else | |
738 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
739 | ||
740 | return mask; | |
741 | } | |
742 | ||
743 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
744 | { | |
745 | struct sock *sk = sock->sk; | |
746 | struct iucv_sock *iucv = iucv_sk(sk); | |
747 | struct iucv_message txmsg; | |
748 | int err = 0; | |
749 | u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; | |
750 | ||
751 | how++; | |
752 | ||
753 | if ((how & ~SHUTDOWN_MASK) || !how) | |
754 | return -EINVAL; | |
755 | ||
756 | lock_sock(sk); | |
757 | switch(sk->sk_state) { | |
758 | case IUCV_CLOSED: | |
759 | err = -ENOTCONN; | |
760 | goto fail; | |
761 | ||
762 | default: | |
763 | sk->sk_shutdown |= how; | |
764 | break; | |
765 | } | |
766 | ||
767 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
768 | txmsg.class = 0; | |
769 | txmsg.tag = 0; | |
770 | err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, | |
771 | (void *) prmmsg, 8); | |
772 | if (err) { | |
773 | switch(err) { | |
774 | case 1: | |
775 | err = -ENOTCONN; | |
776 | break; | |
777 | case 2: | |
778 | err = -ECONNRESET; | |
779 | break; | |
780 | default: | |
781 | err = -ENOTCONN; | |
782 | break; | |
783 | } | |
784 | } | |
785 | } | |
786 | ||
787 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
788 | err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); | |
789 | if (err) | |
790 | err = -ENOTCONN; | |
791 | ||
792 | skb_queue_purge(&sk->sk_receive_queue); | |
793 | } | |
794 | ||
795 | /* Wake up anyone sleeping in poll */ | |
796 | sk->sk_state_change(sk); | |
797 | ||
798 | fail: | |
799 | release_sock(sk); | |
800 | return err; | |
801 | } | |
802 | ||
803 | static int iucv_sock_release(struct socket *sock) | |
804 | { | |
805 | struct sock *sk = sock->sk; | |
806 | int err = 0; | |
807 | ||
808 | if (!sk) | |
809 | return 0; | |
810 | ||
811 | iucv_sock_close(sk); | |
812 | ||
813 | /* Unregister with IUCV base support */ | |
814 | if (iucv_sk(sk)->path) { | |
815 | iucv_path_sever(iucv_sk(sk)->path, NULL); | |
816 | iucv_path_free(iucv_sk(sk)->path); | |
817 | iucv_sk(sk)->path = NULL; | |
818 | } | |
819 | ||
820 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime){ | |
821 | lock_sock(sk); | |
822 | err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, | |
823 | sk->sk_lingertime); | |
824 | release_sock(sk); | |
825 | } | |
826 | ||
827 | sock_orphan(sk); | |
828 | iucv_sock_kill(sk); | |
829 | return err; | |
830 | } | |
831 | ||
832 | /* Callback wrappers - called from iucv base support */ | |
833 | static int iucv_callback_connreq(struct iucv_path *path, | |
834 | u8 ipvmid[8], u8 ipuser[16]) | |
835 | { | |
836 | unsigned char user_data[16]; | |
837 | unsigned char nuser_data[16]; | |
838 | unsigned char src_name[8]; | |
839 | struct hlist_node *node; | |
840 | struct sock *sk, *nsk; | |
841 | struct iucv_sock *iucv, *niucv; | |
842 | int err; | |
843 | ||
844 | memcpy(src_name, ipuser, 8); | |
845 | EBCASC(src_name, 8); | |
846 | /* Find out if this path belongs to af_iucv. */ | |
847 | read_lock(&iucv_sk_list.lock); | |
848 | iucv = NULL; | |
849 | sk_for_each(sk, node, &iucv_sk_list.head) | |
850 | if (sk->sk_state == IUCV_LISTEN && | |
851 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
852 | /* | |
853 | * Found a listening socket with | |
854 | * src_name == ipuser[0-7]. | |
855 | */ | |
856 | iucv = iucv_sk(sk); | |
857 | break; | |
858 | } | |
859 | read_unlock(&iucv_sk_list.lock); | |
860 | if (!iucv) | |
861 | /* No socket found, not one of our paths. */ | |
862 | return -EINVAL; | |
863 | ||
864 | bh_lock_sock(sk); | |
865 | ||
866 | /* Check if parent socket is listening */ | |
867 | low_nmcpy(user_data, iucv->src_name); | |
868 | high_nmcpy(user_data, iucv->dst_name); | |
869 | ASCEBC(user_data, sizeof(user_data)); | |
870 | if (sk->sk_state != IUCV_LISTEN) { | |
871 | err = iucv_path_sever(path, user_data); | |
872 | goto fail; | |
873 | } | |
874 | ||
875 | /* Check for backlog size */ | |
876 | if (sk_acceptq_is_full(sk)) { | |
877 | err = iucv_path_sever(path, user_data); | |
878 | goto fail; | |
879 | } | |
880 | ||
881 | /* Create the new socket */ | |
882 | nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC); | |
883 | if (!nsk){ | |
884 | err = iucv_path_sever(path, user_data); | |
885 | goto fail; | |
886 | } | |
887 | ||
888 | niucv = iucv_sk(nsk); | |
889 | iucv_sock_init(nsk, sk); | |
890 | ||
891 | /* Set the new iucv_sock */ | |
892 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
893 | EBCASC(niucv->dst_name, 8); | |
894 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
895 | memcpy(niucv->src_name, iucv->src_name, 8); | |
896 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
897 | niucv->path = path; | |
898 | ||
899 | /* Call iucv_accept */ | |
900 | high_nmcpy(nuser_data, ipuser + 8); | |
901 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
902 | ASCEBC(nuser_data + 8, 8); | |
903 | ||
904 | path->msglim = IUCV_QUEUELEN_DEFAULT; | |
905 | err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); | |
906 | if (err){ | |
907 | err = iucv_path_sever(path, user_data); | |
908 | goto fail; | |
909 | } | |
910 | ||
911 | iucv_accept_enqueue(sk, nsk); | |
912 | ||
913 | /* Wake up accept */ | |
914 | nsk->sk_state = IUCV_CONNECTED; | |
915 | sk->sk_data_ready(sk, 1); | |
916 | err = 0; | |
917 | fail: | |
918 | bh_unlock_sock(sk); | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
923 | { | |
924 | struct sock *sk = path->private; | |
925 | ||
926 | sk->sk_state = IUCV_CONNECTED; | |
927 | sk->sk_state_change(sk); | |
928 | } | |
929 | ||
930 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
931 | { | |
932 | struct sock *sk = path->private; | |
933 | struct sk_buff *skb; | |
934 | int rc; | |
935 | ||
936 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
937 | return; | |
938 | ||
939 | skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA); | |
940 | if (!skb) { | |
941 | iucv_message_reject(path, msg); | |
942 | return; | |
943 | } | |
944 | ||
945 | if (msg->flags & IPRMDATA) { | |
946 | skb->data = NULL; | |
947 | skb->len = 0; | |
948 | } else { | |
949 | rc = iucv_message_receive(path, msg, 0, skb->data, | |
950 | msg->length, NULL); | |
951 | if (rc) { | |
952 | kfree_skb(skb); | |
953 | return; | |
954 | } | |
955 | ||
956 | skb->h.raw = skb->data; | |
957 | skb->nh.raw = skb->data; | |
958 | skb->len = msg->length; | |
959 | } | |
960 | ||
961 | if (sock_queue_rcv_skb(sk, skb)) | |
962 | kfree_skb(skb); | |
963 | } | |
964 | ||
965 | static void iucv_callback_txdone(struct iucv_path *path, | |
966 | struct iucv_message *msg) | |
967 | { | |
968 | struct sock *sk = path->private; | |
969 | struct sk_buff *this; | |
970 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; | |
971 | struct sk_buff *list_skb = list->next; | |
972 | unsigned long flags; | |
973 | ||
974 | spin_lock_irqsave(&list->lock, flags); | |
975 | ||
976 | do { | |
977 | this = list_skb; | |
978 | list_skb = list_skb->next; | |
979 | } while (memcmp(&msg->tag, this->cb, 4)); | |
980 | ||
981 | spin_unlock_irqrestore(&list->lock, flags); | |
982 | ||
983 | skb_unlink(this, &iucv_sk(sk)->send_skb_q); | |
984 | kfree_skb(this); | |
985 | } | |
986 | ||
987 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
988 | { | |
989 | struct sock *sk = path->private; | |
990 | ||
991 | if (!list_empty(&iucv_sk(sk)->accept_q)) | |
992 | sk->sk_state = IUCV_SEVERED; | |
993 | else | |
994 | sk->sk_state = IUCV_DISCONN; | |
995 | ||
996 | sk->sk_state_change(sk); | |
997 | } | |
998 | ||
999 | static struct proto_ops iucv_sock_ops = { | |
1000 | .family = PF_IUCV, | |
1001 | .owner = THIS_MODULE, | |
1002 | .release = iucv_sock_release, | |
1003 | .bind = iucv_sock_bind, | |
1004 | .connect = iucv_sock_connect, | |
1005 | .listen = iucv_sock_listen, | |
1006 | .accept = iucv_sock_accept, | |
1007 | .getname = iucv_sock_getname, | |
1008 | .sendmsg = iucv_sock_sendmsg, | |
1009 | .recvmsg = iucv_sock_recvmsg, | |
1010 | .poll = iucv_sock_poll, | |
1011 | .ioctl = sock_no_ioctl, | |
1012 | .mmap = sock_no_mmap, | |
1013 | .socketpair = sock_no_socketpair, | |
1014 | .shutdown = iucv_sock_shutdown, | |
1015 | .setsockopt = sock_no_setsockopt, | |
1016 | .getsockopt = sock_no_getsockopt | |
1017 | }; | |
1018 | ||
1019 | static struct net_proto_family iucv_sock_family_ops = { | |
1020 | .family = AF_IUCV, | |
1021 | .owner = THIS_MODULE, | |
1022 | .create = iucv_sock_create, | |
1023 | }; | |
1024 | ||
1025 | static int afiucv_init(void) | |
1026 | { | |
1027 | int err; | |
1028 | ||
1029 | if (!MACHINE_IS_VM) { | |
1030 | printk(KERN_ERR "AF_IUCV connection needs VM as base\n"); | |
1031 | err = -EPROTONOSUPPORT; | |
1032 | goto out; | |
1033 | } | |
1034 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
1035 | if (unlikely(err)) { | |
1036 | printk(KERN_ERR "AF_IUCV needs the VM userid\n"); | |
1037 | err = -EPROTONOSUPPORT; | |
1038 | goto out; | |
1039 | } | |
1040 | ||
1041 | err = iucv_register(&af_iucv_handler, 0); | |
1042 | if (err) | |
1043 | goto out; | |
1044 | err = proto_register(&iucv_proto, 0); | |
1045 | if (err) | |
1046 | goto out_iucv; | |
1047 | err = sock_register(&iucv_sock_family_ops); | |
1048 | if (err) | |
1049 | goto out_proto; | |
1050 | printk(KERN_INFO "AF_IUCV lowlevel driver initialized\n"); | |
1051 | return 0; | |
1052 | ||
1053 | out_proto: | |
1054 | proto_unregister(&iucv_proto); | |
1055 | out_iucv: | |
1056 | iucv_unregister(&af_iucv_handler, 0); | |
1057 | out: | |
1058 | return err; | |
1059 | } | |
1060 | ||
1061 | static void __exit afiucv_exit(void) | |
1062 | { | |
1063 | sock_unregister(PF_IUCV); | |
1064 | proto_unregister(&iucv_proto); | |
1065 | iucv_unregister(&af_iucv_handler, 0); | |
1066 | ||
1067 | printk(KERN_INFO "AF_IUCV lowlevel driver unloaded\n"); | |
1068 | } | |
1069 | ||
1070 | module_init(afiucv_init); | |
1071 | module_exit(afiucv_exit); | |
1072 | ||
1073 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
1074 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
1075 | MODULE_VERSION(VERSION); | |
1076 | MODULE_LICENSE("GPL"); | |
1077 | MODULE_ALIAS_NETPROTO(PF_IUCV); |