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 | ||
8f7c502c UB |
11 | #define KMSG_COMPONENT "af_iucv" |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
eac3731b JH |
14 | #include <linux/module.h> |
15 | #include <linux/types.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/poll.h> | |
24 | #include <net/sock.h> | |
25 | #include <asm/ebcdic.h> | |
26 | #include <asm/cpcmd.h> | |
27 | #include <linux/kmod.h> | |
28 | ||
29 | #include <net/iucv/iucv.h> | |
30 | #include <net/iucv/af_iucv.h> | |
31 | ||
9d5c5d8f | 32 | #define VERSION "1.1" |
eac3731b JH |
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 | ||
b8942e3b HB |
44 | /* special AF_IUCV IPRM messages */ |
45 | static const u8 iprm_shutdown[8] = | |
46 | {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; | |
47 | ||
57f20448 HC |
48 | static void iucv_sock_kill(struct sock *sk); |
49 | static void iucv_sock_close(struct sock *sk); | |
50 | ||
eac3731b JH |
51 | /* Call Back functions */ |
52 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
53 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
54 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
55 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
56 | u8 ipuser[16]); | |
eac3731b | 57 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 58 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
59 | |
60 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 61 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
62 | .autobind_name = ATOMIC_INIT(0) |
63 | }; | |
64 | ||
65 | static struct iucv_handler af_iucv_handler = { | |
66 | .path_pending = iucv_callback_connreq, | |
67 | .path_complete = iucv_callback_connack, | |
68 | .path_severed = iucv_callback_connrej, | |
69 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
70 | .message_complete = iucv_callback_txdone, |
71 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
72 | }; |
73 | ||
74 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
75 | { | |
76 | memcpy(dst, src, 8); | |
77 | } | |
78 | ||
79 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
80 | { | |
81 | memcpy(&dst[8], src, 8); | |
82 | } | |
83 | ||
b8942e3b HB |
84 | /** |
85 | * iucv_msg_length() - Returns the length of an iucv message. | |
86 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
87 | * | |
88 | * The function returns the length of the specified iucv message @msg of data | |
89 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
90 | * | |
91 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
92 | * data: | |
93 | * PRMDATA[0..6] socket data (max 7 bytes); | |
94 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
95 | * | |
96 | * The socket data length is computed by substracting the socket data length | |
97 | * value from 0xFF. | |
98 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
99 | * notifications (see iucv_sock_shutdown); and further, | |
100 | * if the socket data len is > 7, the function returns 8. | |
101 | * | |
102 | * Use this function to allocate socket buffers to store iucv message data. | |
103 | */ | |
104 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
105 | { | |
106 | size_t datalen; | |
107 | ||
108 | if (msg->flags & IUCV_IPRMDATA) { | |
109 | datalen = 0xff - msg->rmmsg[7]; | |
110 | return (datalen < 8) ? datalen : 8; | |
111 | } | |
112 | return msg->length; | |
113 | } | |
114 | ||
eac3731b JH |
115 | /* Timers */ |
116 | static void iucv_sock_timeout(unsigned long arg) | |
117 | { | |
118 | struct sock *sk = (struct sock *)arg; | |
119 | ||
120 | bh_lock_sock(sk); | |
121 | sk->sk_err = ETIMEDOUT; | |
122 | sk->sk_state_change(sk); | |
123 | bh_unlock_sock(sk); | |
124 | ||
125 | iucv_sock_kill(sk); | |
126 | sock_put(sk); | |
127 | } | |
128 | ||
129 | static void iucv_sock_clear_timer(struct sock *sk) | |
130 | { | |
131 | sk_stop_timer(sk, &sk->sk_timer); | |
132 | } | |
133 | ||
eac3731b JH |
134 | static struct sock *__iucv_get_sock_by_name(char *nm) |
135 | { | |
136 | struct sock *sk; | |
137 | struct hlist_node *node; | |
138 | ||
139 | sk_for_each(sk, node, &iucv_sk_list.head) | |
140 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
141 | return sk; | |
142 | ||
143 | return NULL; | |
144 | } | |
145 | ||
146 | static void iucv_sock_destruct(struct sock *sk) | |
147 | { | |
148 | skb_queue_purge(&sk->sk_receive_queue); | |
149 | skb_queue_purge(&sk->sk_write_queue); | |
150 | } | |
151 | ||
152 | /* Cleanup Listen */ | |
153 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
154 | { | |
155 | struct sock *sk; | |
156 | ||
157 | /* Close non-accepted connections */ | |
158 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
159 | iucv_sock_close(sk); | |
160 | iucv_sock_kill(sk); | |
161 | } | |
162 | ||
163 | parent->sk_state = IUCV_CLOSED; | |
164 | sock_set_flag(parent, SOCK_ZAPPED); | |
165 | } | |
166 | ||
167 | /* Kill socket */ | |
168 | static void iucv_sock_kill(struct sock *sk) | |
169 | { | |
170 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
171 | return; | |
172 | ||
173 | iucv_sock_unlink(&iucv_sk_list, sk); | |
174 | sock_set_flag(sk, SOCK_DEAD); | |
175 | sock_put(sk); | |
176 | } | |
177 | ||
178 | /* Close an IUCV socket */ | |
179 | static void iucv_sock_close(struct sock *sk) | |
180 | { | |
181 | unsigned char user_data[16]; | |
182 | struct iucv_sock *iucv = iucv_sk(sk); | |
183 | int err; | |
561e0360 | 184 | unsigned long timeo; |
eac3731b JH |
185 | |
186 | iucv_sock_clear_timer(sk); | |
187 | lock_sock(sk); | |
188 | ||
da99f056 | 189 | switch (sk->sk_state) { |
eac3731b JH |
190 | case IUCV_LISTEN: |
191 | iucv_sock_cleanup_listen(sk); | |
192 | break; | |
193 | ||
194 | case IUCV_CONNECTED: | |
195 | case IUCV_DISCONN: | |
196 | err = 0; | |
561e0360 JH |
197 | |
198 | sk->sk_state = IUCV_CLOSING; | |
199 | sk->sk_state_change(sk); | |
200 | ||
da99f056 | 201 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
202 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
203 | timeo = sk->sk_lingertime; | |
204 | else | |
205 | timeo = IUCV_DISCONN_TIMEOUT; | |
206 | err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo); | |
207 | } | |
208 | ||
209 | sk->sk_state = IUCV_CLOSED; | |
210 | sk->sk_state_change(sk); | |
211 | ||
eac3731b JH |
212 | if (iucv->path) { |
213 | low_nmcpy(user_data, iucv->src_name); | |
214 | high_nmcpy(user_data, iucv->dst_name); | |
215 | ASCEBC(user_data, sizeof(user_data)); | |
216 | err = iucv_path_sever(iucv->path, user_data); | |
217 | iucv_path_free(iucv->path); | |
218 | iucv->path = NULL; | |
219 | } | |
220 | ||
eac3731b JH |
221 | sk->sk_err = ECONNRESET; |
222 | sk->sk_state_change(sk); | |
223 | ||
224 | skb_queue_purge(&iucv->send_skb_q); | |
561e0360 | 225 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b JH |
226 | |
227 | sock_set_flag(sk, SOCK_ZAPPED); | |
228 | break; | |
229 | ||
230 | default: | |
231 | sock_set_flag(sk, SOCK_ZAPPED); | |
232 | break; | |
3ff50b79 | 233 | } |
eac3731b JH |
234 | |
235 | release_sock(sk); | |
236 | iucv_sock_kill(sk); | |
237 | } | |
238 | ||
239 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
240 | { | |
241 | if (parent) | |
242 | sk->sk_type = parent->sk_type; | |
243 | } | |
244 | ||
245 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
246 | { | |
247 | struct sock *sk; | |
248 | ||
6257ff21 | 249 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
250 | if (!sk) |
251 | return NULL; | |
252 | ||
253 | sock_init_data(sock, sk); | |
254 | INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); | |
febca281 | 255 | spin_lock_init(&iucv_sk(sk)->accept_q_lock); |
eac3731b | 256 | skb_queue_head_init(&iucv_sk(sk)->send_skb_q); |
f0703c80 UB |
257 | INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list); |
258 | spin_lock_init(&iucv_sk(sk)->message_q.lock); | |
561e0360 | 259 | skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q); |
eac3731b | 260 | iucv_sk(sk)->send_tag = 0; |
9d5c5d8f | 261 | iucv_sk(sk)->flags = 0; |
eac3731b JH |
262 | |
263 | sk->sk_destruct = iucv_sock_destruct; | |
264 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
265 | sk->sk_allocation = GFP_DMA; | |
266 | ||
267 | sock_reset_flag(sk, SOCK_ZAPPED); | |
268 | ||
269 | sk->sk_protocol = proto; | |
270 | sk->sk_state = IUCV_OPEN; | |
271 | ||
b24b8a24 | 272 | setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); |
eac3731b JH |
273 | |
274 | iucv_sock_link(&iucv_sk_list, sk); | |
275 | return sk; | |
276 | } | |
277 | ||
278 | /* Create an IUCV socket */ | |
1b8d7ae4 | 279 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol) |
eac3731b JH |
280 | { |
281 | struct sock *sk; | |
282 | ||
283 | if (sock->type != SOCK_STREAM) | |
284 | return -ESOCKTNOSUPPORT; | |
285 | ||
286 | sock->state = SS_UNCONNECTED; | |
287 | sock->ops = &iucv_sock_ops; | |
288 | ||
289 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
290 | if (!sk) | |
291 | return -ENOMEM; | |
292 | ||
293 | iucv_sock_init(sk, NULL); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
298 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
299 | { | |
300 | write_lock_bh(&l->lock); | |
301 | sk_add_node(sk, &l->head); | |
302 | write_unlock_bh(&l->lock); | |
303 | } | |
304 | ||
305 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
306 | { | |
307 | write_lock_bh(&l->lock); | |
308 | sk_del_node_init(sk); | |
309 | write_unlock_bh(&l->lock); | |
310 | } | |
311 | ||
312 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
313 | { | |
febca281 UB |
314 | unsigned long flags; |
315 | struct iucv_sock *par = iucv_sk(parent); | |
316 | ||
eac3731b | 317 | sock_hold(sk); |
febca281 UB |
318 | spin_lock_irqsave(&par->accept_q_lock, flags); |
319 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
320 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b JH |
321 | iucv_sk(sk)->parent = parent; |
322 | parent->sk_ack_backlog++; | |
323 | } | |
324 | ||
325 | void iucv_accept_unlink(struct sock *sk) | |
326 | { | |
febca281 UB |
327 | unsigned long flags; |
328 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
329 | ||
330 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 331 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 332 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
eac3731b JH |
333 | iucv_sk(sk)->parent->sk_ack_backlog--; |
334 | iucv_sk(sk)->parent = NULL; | |
335 | sock_put(sk); | |
336 | } | |
337 | ||
338 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
339 | { | |
340 | struct iucv_sock *isk, *n; | |
341 | struct sock *sk; | |
342 | ||
da99f056 | 343 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
344 | sk = (struct sock *) isk; |
345 | lock_sock(sk); | |
346 | ||
347 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 348 | iucv_accept_unlink(sk); |
febca281 | 349 | release_sock(sk); |
eac3731b JH |
350 | continue; |
351 | } | |
352 | ||
353 | if (sk->sk_state == IUCV_CONNECTED || | |
354 | sk->sk_state == IUCV_SEVERED || | |
355 | !newsock) { | |
356 | iucv_accept_unlink(sk); | |
357 | if (newsock) | |
358 | sock_graft(sk, newsock); | |
359 | ||
360 | if (sk->sk_state == IUCV_SEVERED) | |
361 | sk->sk_state = IUCV_DISCONN; | |
362 | ||
363 | release_sock(sk); | |
364 | return sk; | |
365 | } | |
366 | ||
367 | release_sock(sk); | |
368 | } | |
369 | return NULL; | |
370 | } | |
371 | ||
372 | int iucv_sock_wait_state(struct sock *sk, int state, int state2, | |
373 | unsigned long timeo) | |
374 | { | |
375 | DECLARE_WAITQUEUE(wait, current); | |
376 | int err = 0; | |
377 | ||
378 | add_wait_queue(sk->sk_sleep, &wait); | |
379 | while (sk->sk_state != state && sk->sk_state != state2) { | |
380 | set_current_state(TASK_INTERRUPTIBLE); | |
381 | ||
382 | if (!timeo) { | |
383 | err = -EAGAIN; | |
384 | break; | |
385 | } | |
386 | ||
387 | if (signal_pending(current)) { | |
388 | err = sock_intr_errno(timeo); | |
389 | break; | |
390 | } | |
391 | ||
392 | release_sock(sk); | |
393 | timeo = schedule_timeout(timeo); | |
394 | lock_sock(sk); | |
395 | ||
396 | err = sock_error(sk); | |
397 | if (err) | |
398 | break; | |
399 | } | |
400 | set_current_state(TASK_RUNNING); | |
401 | remove_wait_queue(sk->sk_sleep, &wait); | |
402 | return err; | |
403 | } | |
404 | ||
405 | /* Bind an unbound socket */ | |
406 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
407 | int addr_len) | |
408 | { | |
409 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
410 | struct sock *sk = sock->sk; | |
411 | struct iucv_sock *iucv; | |
412 | int err; | |
413 | ||
414 | /* Verify the input sockaddr */ | |
415 | if (!addr || addr->sa_family != AF_IUCV) | |
416 | return -EINVAL; | |
417 | ||
418 | lock_sock(sk); | |
419 | if (sk->sk_state != IUCV_OPEN) { | |
420 | err = -EBADFD; | |
421 | goto done; | |
422 | } | |
423 | ||
424 | write_lock_bh(&iucv_sk_list.lock); | |
425 | ||
426 | iucv = iucv_sk(sk); | |
427 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
428 | err = -EADDRINUSE; | |
429 | goto done_unlock; | |
430 | } | |
431 | if (iucv->path) { | |
432 | err = 0; | |
433 | goto done_unlock; | |
434 | } | |
435 | ||
436 | /* Bind the socket */ | |
437 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
438 | ||
439 | /* Copy the user id */ | |
440 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
441 | sk->sk_state = IUCV_BOUND; | |
442 | err = 0; | |
443 | ||
444 | done_unlock: | |
445 | /* Release the socket list lock */ | |
446 | write_unlock_bh(&iucv_sk_list.lock); | |
447 | done: | |
448 | release_sock(sk); | |
449 | return err; | |
450 | } | |
451 | ||
452 | /* Automatically bind an unbound socket */ | |
453 | static int iucv_sock_autobind(struct sock *sk) | |
454 | { | |
455 | struct iucv_sock *iucv = iucv_sk(sk); | |
456 | char query_buffer[80]; | |
457 | char name[12]; | |
458 | int err = 0; | |
459 | ||
460 | /* Set the userid and name */ | |
461 | cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); | |
462 | if (unlikely(err)) | |
463 | return -EPROTO; | |
464 | ||
465 | memcpy(iucv->src_user_id, query_buffer, 8); | |
466 | ||
467 | write_lock_bh(&iucv_sk_list.lock); | |
468 | ||
469 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
470 | while (__iucv_get_sock_by_name(name)) { | |
471 | sprintf(name, "%08x", | |
472 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
473 | } | |
474 | ||
475 | write_unlock_bh(&iucv_sk_list.lock); | |
476 | ||
477 | memcpy(&iucv->src_name, name, 8); | |
478 | ||
479 | return err; | |
480 | } | |
481 | ||
482 | /* Connect an unconnected socket */ | |
483 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
484 | int alen, int flags) | |
485 | { | |
486 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
487 | struct sock *sk = sock->sk; | |
488 | struct iucv_sock *iucv; | |
489 | unsigned char user_data[16]; | |
490 | int err; | |
491 | ||
492 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
493 | return -EINVAL; | |
494 | ||
495 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
496 | return -EBADFD; | |
497 | ||
498 | if (sk->sk_type != SOCK_STREAM) | |
499 | return -EINVAL; | |
500 | ||
501 | iucv = iucv_sk(sk); | |
502 | ||
503 | if (sk->sk_state == IUCV_OPEN) { | |
504 | err = iucv_sock_autobind(sk); | |
505 | if (unlikely(err)) | |
506 | return err; | |
507 | } | |
508 | ||
509 | lock_sock(sk); | |
510 | ||
511 | /* Set the destination information */ | |
512 | memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); | |
513 | memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); | |
514 | ||
515 | high_nmcpy(user_data, sa->siucv_name); | |
516 | low_nmcpy(user_data, iucv_sk(sk)->src_name); | |
517 | ASCEBC(user_data, sizeof(user_data)); | |
518 | ||
519 | iucv = iucv_sk(sk); | |
520 | /* Create path. */ | |
521 | iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT, | |
b8942e3b | 522 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
523 | if (!iucv->path) { |
524 | err = -ENOMEM; | |
525 | goto done; | |
526 | } | |
eac3731b JH |
527 | err = iucv_path_connect(iucv->path, &af_iucv_handler, |
528 | sa->siucv_user_id, NULL, user_data, sk); | |
529 | if (err) { | |
530 | iucv_path_free(iucv->path); | |
531 | iucv->path = NULL; | |
55cdea9e HB |
532 | switch (err) { |
533 | case 0x0b: /* Target communicator is not logged on */ | |
534 | err = -ENETUNREACH; | |
535 | break; | |
536 | case 0x0d: /* Max connections for this guest exceeded */ | |
537 | case 0x0e: /* Max connections for target guest exceeded */ | |
538 | err = -EAGAIN; | |
539 | break; | |
540 | case 0x0f: /* Missing IUCV authorization */ | |
541 | err = -EACCES; | |
542 | break; | |
543 | default: | |
544 | err = -ECONNREFUSED; | |
545 | break; | |
546 | } | |
eac3731b JH |
547 | goto done; |
548 | } | |
549 | ||
550 | if (sk->sk_state != IUCV_CONNECTED) { | |
551 | err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN, | |
552 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
553 | } | |
554 | ||
555 | if (sk->sk_state == IUCV_DISCONN) { | |
b8942e3b | 556 | err = -ECONNREFUSED; |
eac3731b | 557 | } |
18becbc5 UB |
558 | |
559 | if (err) { | |
560 | iucv_path_sever(iucv->path, NULL); | |
561 | iucv_path_free(iucv->path); | |
562 | iucv->path = NULL; | |
563 | } | |
564 | ||
eac3731b JH |
565 | done: |
566 | release_sock(sk); | |
567 | return err; | |
568 | } | |
569 | ||
570 | /* Move a socket into listening state. */ | |
571 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
572 | { | |
573 | struct sock *sk = sock->sk; | |
574 | int err; | |
575 | ||
576 | lock_sock(sk); | |
577 | ||
578 | err = -EINVAL; | |
579 | if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM) | |
580 | goto done; | |
581 | ||
582 | sk->sk_max_ack_backlog = backlog; | |
583 | sk->sk_ack_backlog = 0; | |
584 | sk->sk_state = IUCV_LISTEN; | |
585 | err = 0; | |
586 | ||
587 | done: | |
588 | release_sock(sk); | |
589 | return err; | |
590 | } | |
591 | ||
592 | /* Accept a pending connection */ | |
593 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
594 | int flags) | |
595 | { | |
596 | DECLARE_WAITQUEUE(wait, current); | |
597 | struct sock *sk = sock->sk, *nsk; | |
598 | long timeo; | |
599 | int err = 0; | |
600 | ||
561e0360 | 601 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
602 | |
603 | if (sk->sk_state != IUCV_LISTEN) { | |
604 | err = -EBADFD; | |
605 | goto done; | |
606 | } | |
607 | ||
608 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
609 | ||
610 | /* Wait for an incoming connection */ | |
611 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
da99f056 | 612 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
613 | set_current_state(TASK_INTERRUPTIBLE); |
614 | if (!timeo) { | |
615 | err = -EAGAIN; | |
616 | break; | |
617 | } | |
618 | ||
619 | release_sock(sk); | |
620 | timeo = schedule_timeout(timeo); | |
561e0360 | 621 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
622 | |
623 | if (sk->sk_state != IUCV_LISTEN) { | |
624 | err = -EBADFD; | |
625 | break; | |
626 | } | |
627 | ||
628 | if (signal_pending(current)) { | |
629 | err = sock_intr_errno(timeo); | |
630 | break; | |
631 | } | |
632 | } | |
633 | ||
634 | set_current_state(TASK_RUNNING); | |
635 | remove_wait_queue(sk->sk_sleep, &wait); | |
636 | ||
637 | if (err) | |
638 | goto done; | |
639 | ||
640 | newsock->state = SS_CONNECTED; | |
641 | ||
642 | done: | |
643 | release_sock(sk); | |
644 | return err; | |
645 | } | |
646 | ||
647 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
648 | int *len, int peer) | |
649 | { | |
650 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
651 | struct sock *sk = sock->sk; | |
652 | ||
653 | addr->sa_family = AF_IUCV; | |
654 | *len = sizeof(struct sockaddr_iucv); | |
655 | ||
656 | if (peer) { | |
657 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); | |
658 | memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); | |
659 | } else { | |
660 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8); | |
661 | memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); | |
662 | } | |
663 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
664 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
665 | memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
b8942e3b HB |
670 | /** |
671 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
672 | * @path: IUCV path | |
673 | * @msg: Pointer to a struct iucv_message | |
674 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
675 | * | |
676 | * Send the socket data in the parameter list in the iucv message | |
677 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
678 | * list and the socket data len at index 7 (last byte). | |
679 | * See also iucv_msg_length(). | |
680 | * | |
681 | * Returns the error code from the iucv_message_send() call. | |
682 | */ | |
683 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
684 | struct sk_buff *skb) | |
685 | { | |
686 | u8 prmdata[8]; | |
687 | ||
688 | memcpy(prmdata, (void *) skb->data, skb->len); | |
689 | prmdata[7] = 0xff - (u8) skb->len; | |
690 | return iucv_message_send(path, msg, IUCV_IPRMDATA, 0, | |
691 | (void *) prmdata, 8); | |
692 | } | |
693 | ||
eac3731b JH |
694 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
695 | struct msghdr *msg, size_t len) | |
696 | { | |
697 | struct sock *sk = sock->sk; | |
698 | struct iucv_sock *iucv = iucv_sk(sk); | |
699 | struct sk_buff *skb; | |
700 | struct iucv_message txmsg; | |
8f7c502c UB |
701 | char user_id[9]; |
702 | char appl_id[9]; | |
eac3731b JH |
703 | int err; |
704 | ||
705 | err = sock_error(sk); | |
706 | if (err) | |
707 | return err; | |
708 | ||
709 | if (msg->msg_flags & MSG_OOB) | |
710 | return -EOPNOTSUPP; | |
711 | ||
712 | lock_sock(sk); | |
713 | ||
714 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
715 | err = -EPIPE; | |
716 | goto out; | |
717 | } | |
718 | ||
da99f056 HC |
719 | if (sk->sk_state == IUCV_CONNECTED) { |
720 | if (!(skb = sock_alloc_send_skb(sk, len, | |
721 | msg->msg_flags & MSG_DONTWAIT, | |
722 | &err))) | |
561e0360 | 723 | goto out; |
eac3731b | 724 | |
da99f056 | 725 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
eac3731b JH |
726 | err = -EFAULT; |
727 | goto fail; | |
728 | } | |
729 | ||
730 | txmsg.class = 0; | |
469689a4 | 731 | memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len); |
eac3731b JH |
732 | txmsg.tag = iucv->send_tag++; |
733 | memcpy(skb->cb, &txmsg.tag, 4); | |
734 | skb_queue_tail(&iucv->send_skb_q, skb); | |
b8942e3b HB |
735 | |
736 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) | |
737 | && skb->len <= 7) { | |
738 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
739 | ||
740 | /* on success: there is no message_complete callback | |
741 | * for an IPRMDATA msg; remove skb from send queue */ | |
742 | if (err == 0) { | |
743 | skb_unlink(skb, &iucv->send_skb_q); | |
744 | kfree_skb(skb); | |
745 | } | |
746 | ||
747 | /* this error should never happen since the | |
748 | * IUCV_IPRMDATA path flag is set... sever path */ | |
749 | if (err == 0x15) { | |
750 | iucv_path_sever(iucv->path, NULL); | |
751 | skb_unlink(skb, &iucv->send_skb_q); | |
752 | err = -EPIPE; | |
753 | goto fail; | |
754 | } | |
755 | } else | |
756 | err = iucv_message_send(iucv->path, &txmsg, 0, 0, | |
757 | (void *) skb->data, skb->len); | |
eac3731b | 758 | if (err) { |
8f7c502c UB |
759 | if (err == 3) { |
760 | user_id[8] = 0; | |
761 | memcpy(user_id, iucv->dst_user_id, 8); | |
762 | appl_id[8] = 0; | |
763 | memcpy(appl_id, iucv->dst_name, 8); | |
764 | pr_err("Application %s on z/VM guest %s" | |
765 | " exceeds message limit\n", | |
766 | user_id, appl_id); | |
767 | } | |
eac3731b JH |
768 | skb_unlink(skb, &iucv->send_skb_q); |
769 | err = -EPIPE; | |
770 | goto fail; | |
771 | } | |
772 | ||
773 | } else { | |
774 | err = -ENOTCONN; | |
775 | goto out; | |
776 | } | |
777 | ||
778 | release_sock(sk); | |
779 | return len; | |
780 | ||
781 | fail: | |
782 | kfree_skb(skb); | |
783 | out: | |
784 | release_sock(sk); | |
785 | return err; | |
786 | } | |
787 | ||
f0703c80 UB |
788 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
789 | { | |
790 | int dataleft, size, copied = 0; | |
791 | struct sk_buff *nskb; | |
792 | ||
793 | dataleft = len; | |
794 | while (dataleft) { | |
795 | if (dataleft >= sk->sk_rcvbuf / 4) | |
796 | size = sk->sk_rcvbuf / 4; | |
797 | else | |
798 | size = dataleft; | |
799 | ||
800 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
801 | if (!nskb) | |
802 | return -ENOMEM; | |
803 | ||
804 | memcpy(nskb->data, skb->data + copied, size); | |
805 | copied += size; | |
806 | dataleft -= size; | |
807 | ||
808 | skb_reset_transport_header(nskb); | |
809 | skb_reset_network_header(nskb); | |
810 | nskb->len = size; | |
811 | ||
812 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
813 | } | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
818 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, | |
819 | struct iucv_path *path, | |
820 | struct iucv_message *msg) | |
821 | { | |
822 | int rc; | |
b8942e3b HB |
823 | unsigned int len; |
824 | ||
825 | len = iucv_msg_length(msg); | |
f0703c80 | 826 | |
b8942e3b HB |
827 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
828 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
829 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
830 | skb->data = NULL; | |
831 | skb->len = 0; | |
832 | } | |
f0703c80 | 833 | } else { |
b8942e3b HB |
834 | rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA, |
835 | skb->data, len, NULL); | |
f0703c80 UB |
836 | if (rc) { |
837 | kfree_skb(skb); | |
838 | return; | |
839 | } | |
840 | if (skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 841 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
842 | kfree_skb(skb); |
843 | skb = NULL; | |
844 | if (rc) { | |
845 | iucv_path_sever(path, NULL); | |
846 | return; | |
847 | } | |
848 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
849 | } else { | |
850 | skb_reset_transport_header(skb); | |
851 | skb_reset_network_header(skb); | |
b8942e3b | 852 | skb->len = len; |
f0703c80 UB |
853 | } |
854 | } | |
855 | ||
856 | if (sock_queue_rcv_skb(sk, skb)) | |
857 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
858 | } | |
859 | ||
860 | static void iucv_process_message_q(struct sock *sk) | |
861 | { | |
862 | struct iucv_sock *iucv = iucv_sk(sk); | |
863 | struct sk_buff *skb; | |
864 | struct sock_msg_q *p, *n; | |
865 | ||
866 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 867 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
868 | if (!skb) |
869 | break; | |
870 | iucv_process_message(sk, skb, p->path, &p->msg); | |
871 | list_del(&p->list); | |
872 | kfree(p); | |
873 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
874 | break; | |
875 | } | |
876 | } | |
877 | ||
eac3731b JH |
878 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
879 | struct msghdr *msg, size_t len, int flags) | |
880 | { | |
881 | int noblock = flags & MSG_DONTWAIT; | |
882 | struct sock *sk = sock->sk; | |
561e0360 | 883 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b | 884 | int target, copied = 0; |
561e0360 | 885 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b JH |
886 | int err = 0; |
887 | ||
561e0360 | 888 | if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && |
f0703c80 UB |
889 | skb_queue_empty(&iucv->backlog_skb_q) && |
890 | skb_queue_empty(&sk->sk_receive_queue) && | |
891 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
892 | return 0; |
893 | ||
eac3731b JH |
894 | if (flags & (MSG_OOB)) |
895 | return -EOPNOTSUPP; | |
896 | ||
897 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
898 | ||
899 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
900 | if (!skb) { | |
901 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
902 | return 0; | |
903 | return err; | |
904 | } | |
905 | ||
906 | copied = min_t(unsigned int, skb->len, len); | |
907 | ||
561e0360 JH |
908 | cskb = skb; |
909 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
eac3731b JH |
910 | skb_queue_head(&sk->sk_receive_queue, skb); |
911 | if (copied == 0) | |
912 | return -EFAULT; | |
561e0360 | 913 | goto done; |
eac3731b JH |
914 | } |
915 | ||
916 | len -= copied; | |
917 | ||
918 | /* Mark read part of skb as used */ | |
919 | if (!(flags & MSG_PEEK)) { | |
920 | skb_pull(skb, copied); | |
921 | ||
922 | if (skb->len) { | |
923 | skb_queue_head(&sk->sk_receive_queue, skb); | |
924 | goto done; | |
925 | } | |
926 | ||
927 | kfree_skb(skb); | |
561e0360 JH |
928 | |
929 | /* Queue backlog skbs */ | |
f0703c80 | 930 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 931 | while (rskb) { |
561e0360 | 932 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 933 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
934 | rskb); |
935 | break; | |
936 | } else { | |
f0703c80 | 937 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
938 | } |
939 | } | |
f0703c80 UB |
940 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
941 | spin_lock_bh(&iucv->message_q.lock); | |
942 | if (!list_empty(&iucv->message_q.list)) | |
943 | iucv_process_message_q(sk); | |
944 | spin_unlock_bh(&iucv->message_q.lock); | |
945 | } | |
946 | ||
eac3731b JH |
947 | } else |
948 | skb_queue_head(&sk->sk_receive_queue, skb); | |
949 | ||
950 | done: | |
951 | return err ? : copied; | |
952 | } | |
953 | ||
954 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
955 | { | |
956 | struct iucv_sock *isk, *n; | |
957 | struct sock *sk; | |
958 | ||
da99f056 | 959 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
960 | sk = (struct sock *) isk; |
961 | ||
962 | if (sk->sk_state == IUCV_CONNECTED) | |
963 | return POLLIN | POLLRDNORM; | |
964 | } | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
969 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
970 | poll_table *wait) | |
971 | { | |
972 | struct sock *sk = sock->sk; | |
973 | unsigned int mask = 0; | |
974 | ||
975 | poll_wait(file, sk->sk_sleep, wait); | |
976 | ||
977 | if (sk->sk_state == IUCV_LISTEN) | |
978 | return iucv_accept_poll(sk); | |
979 | ||
980 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
981 | mask |= POLLERR; | |
982 | ||
983 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
984 | mask |= POLLRDHUP; | |
985 | ||
986 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
987 | mask |= POLLHUP; | |
988 | ||
989 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 990 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
991 | mask |= POLLIN | POLLRDNORM; |
992 | ||
993 | if (sk->sk_state == IUCV_CLOSED) | |
994 | mask |= POLLHUP; | |
995 | ||
561e0360 JH |
996 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) |
997 | mask |= POLLIN; | |
998 | ||
eac3731b JH |
999 | if (sock_writeable(sk)) |
1000 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1001 | else | |
1002 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1003 | ||
1004 | return mask; | |
1005 | } | |
1006 | ||
1007 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1008 | { | |
1009 | struct sock *sk = sock->sk; | |
1010 | struct iucv_sock *iucv = iucv_sk(sk); | |
1011 | struct iucv_message txmsg; | |
1012 | int err = 0; | |
eac3731b JH |
1013 | |
1014 | how++; | |
1015 | ||
1016 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1017 | return -EINVAL; | |
1018 | ||
1019 | lock_sock(sk); | |
da99f056 | 1020 | switch (sk->sk_state) { |
eac3731b JH |
1021 | case IUCV_CLOSED: |
1022 | err = -ENOTCONN; | |
1023 | goto fail; | |
1024 | ||
1025 | default: | |
1026 | sk->sk_shutdown |= how; | |
1027 | break; | |
1028 | } | |
1029 | ||
1030 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1031 | txmsg.class = 0; | |
1032 | txmsg.tag = 0; | |
1033 | err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, | |
b8942e3b | 1034 | (void *) iprm_shutdown, 8); |
eac3731b | 1035 | if (err) { |
da99f056 | 1036 | switch (err) { |
eac3731b JH |
1037 | case 1: |
1038 | err = -ENOTCONN; | |
1039 | break; | |
1040 | case 2: | |
1041 | err = -ECONNRESET; | |
1042 | break; | |
1043 | default: | |
1044 | err = -ENOTCONN; | |
1045 | break; | |
1046 | } | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1051 | err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); | |
1052 | if (err) | |
1053 | err = -ENOTCONN; | |
1054 | ||
1055 | skb_queue_purge(&sk->sk_receive_queue); | |
1056 | } | |
1057 | ||
1058 | /* Wake up anyone sleeping in poll */ | |
1059 | sk->sk_state_change(sk); | |
1060 | ||
1061 | fail: | |
1062 | release_sock(sk); | |
1063 | return err; | |
1064 | } | |
1065 | ||
1066 | static int iucv_sock_release(struct socket *sock) | |
1067 | { | |
1068 | struct sock *sk = sock->sk; | |
1069 | int err = 0; | |
1070 | ||
1071 | if (!sk) | |
1072 | return 0; | |
1073 | ||
1074 | iucv_sock_close(sk); | |
1075 | ||
1076 | /* Unregister with IUCV base support */ | |
1077 | if (iucv_sk(sk)->path) { | |
1078 | iucv_path_sever(iucv_sk(sk)->path, NULL); | |
1079 | iucv_path_free(iucv_sk(sk)->path); | |
1080 | iucv_sk(sk)->path = NULL; | |
1081 | } | |
1082 | ||
eac3731b JH |
1083 | sock_orphan(sk); |
1084 | iucv_sock_kill(sk); | |
1085 | return err; | |
1086 | } | |
1087 | ||
9d5c5d8f HB |
1088 | /* getsockopt and setsockopt */ |
1089 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
1090 | char __user *optval, int optlen) | |
1091 | { | |
1092 | struct sock *sk = sock->sk; | |
1093 | struct iucv_sock *iucv = iucv_sk(sk); | |
1094 | int val; | |
1095 | int rc; | |
1096 | ||
1097 | if (level != SOL_IUCV) | |
1098 | return -ENOPROTOOPT; | |
1099 | ||
1100 | if (optlen < sizeof(int)) | |
1101 | return -EINVAL; | |
1102 | ||
1103 | if (get_user(val, (int __user *) optval)) | |
1104 | return -EFAULT; | |
1105 | ||
1106 | rc = 0; | |
1107 | ||
1108 | lock_sock(sk); | |
1109 | switch (optname) { | |
1110 | case SO_IPRMDATA_MSG: | |
1111 | if (val) | |
1112 | iucv->flags |= IUCV_IPRMDATA; | |
1113 | else | |
1114 | iucv->flags &= ~IUCV_IPRMDATA; | |
1115 | break; | |
1116 | default: | |
1117 | rc = -ENOPROTOOPT; | |
1118 | break; | |
1119 | } | |
1120 | release_sock(sk); | |
1121 | ||
1122 | return rc; | |
1123 | } | |
1124 | ||
1125 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1126 | char __user *optval, int __user *optlen) | |
1127 | { | |
1128 | struct sock *sk = sock->sk; | |
1129 | struct iucv_sock *iucv = iucv_sk(sk); | |
1130 | int val, len; | |
1131 | ||
1132 | if (level != SOL_IUCV) | |
1133 | return -ENOPROTOOPT; | |
1134 | ||
1135 | if (get_user(len, optlen)) | |
1136 | return -EFAULT; | |
1137 | ||
1138 | if (len < 0) | |
1139 | return -EINVAL; | |
1140 | ||
1141 | len = min_t(unsigned int, len, sizeof(int)); | |
1142 | ||
1143 | switch (optname) { | |
1144 | case SO_IPRMDATA_MSG: | |
1145 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1146 | break; | |
1147 | default: | |
1148 | return -ENOPROTOOPT; | |
1149 | } | |
1150 | ||
1151 | if (put_user(len, optlen)) | |
1152 | return -EFAULT; | |
1153 | if (copy_to_user(optval, &val, len)) | |
1154 | return -EFAULT; | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | ||
eac3731b JH |
1160 | /* Callback wrappers - called from iucv base support */ |
1161 | static int iucv_callback_connreq(struct iucv_path *path, | |
1162 | u8 ipvmid[8], u8 ipuser[16]) | |
1163 | { | |
1164 | unsigned char user_data[16]; | |
1165 | unsigned char nuser_data[16]; | |
1166 | unsigned char src_name[8]; | |
1167 | struct hlist_node *node; | |
1168 | struct sock *sk, *nsk; | |
1169 | struct iucv_sock *iucv, *niucv; | |
1170 | int err; | |
1171 | ||
1172 | memcpy(src_name, ipuser, 8); | |
1173 | EBCASC(src_name, 8); | |
1174 | /* Find out if this path belongs to af_iucv. */ | |
1175 | read_lock(&iucv_sk_list.lock); | |
1176 | iucv = NULL; | |
febca281 | 1177 | sk = NULL; |
eac3731b JH |
1178 | sk_for_each(sk, node, &iucv_sk_list.head) |
1179 | if (sk->sk_state == IUCV_LISTEN && | |
1180 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1181 | /* | |
1182 | * Found a listening socket with | |
1183 | * src_name == ipuser[0-7]. | |
1184 | */ | |
1185 | iucv = iucv_sk(sk); | |
1186 | break; | |
1187 | } | |
1188 | read_unlock(&iucv_sk_list.lock); | |
1189 | if (!iucv) | |
1190 | /* No socket found, not one of our paths. */ | |
1191 | return -EINVAL; | |
1192 | ||
1193 | bh_lock_sock(sk); | |
1194 | ||
1195 | /* Check if parent socket is listening */ | |
1196 | low_nmcpy(user_data, iucv->src_name); | |
1197 | high_nmcpy(user_data, iucv->dst_name); | |
1198 | ASCEBC(user_data, sizeof(user_data)); | |
1199 | if (sk->sk_state != IUCV_LISTEN) { | |
1200 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1201 | iucv_path_free(path); |
eac3731b JH |
1202 | goto fail; |
1203 | } | |
1204 | ||
1205 | /* Check for backlog size */ | |
1206 | if (sk_acceptq_is_full(sk)) { | |
1207 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1208 | iucv_path_free(path); |
eac3731b JH |
1209 | goto fail; |
1210 | } | |
1211 | ||
1212 | /* Create the new socket */ | |
1213 | nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC); | |
da99f056 | 1214 | if (!nsk) { |
eac3731b | 1215 | err = iucv_path_sever(path, user_data); |
65dbd7c2 | 1216 | iucv_path_free(path); |
eac3731b JH |
1217 | goto fail; |
1218 | } | |
1219 | ||
1220 | niucv = iucv_sk(nsk); | |
1221 | iucv_sock_init(nsk, sk); | |
1222 | ||
1223 | /* Set the new iucv_sock */ | |
1224 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1225 | EBCASC(niucv->dst_name, 8); | |
1226 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1227 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1228 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1229 | niucv->path = path; | |
1230 | ||
1231 | /* Call iucv_accept */ | |
1232 | high_nmcpy(nuser_data, ipuser + 8); | |
1233 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1234 | ASCEBC(nuser_data + 8, 8); | |
1235 | ||
1236 | path->msglim = IUCV_QUEUELEN_DEFAULT; | |
1237 | err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); | |
da99f056 | 1238 | if (err) { |
eac3731b | 1239 | err = iucv_path_sever(path, user_data); |
65dbd7c2 HB |
1240 | iucv_path_free(path); |
1241 | iucv_sock_kill(nsk); | |
eac3731b JH |
1242 | goto fail; |
1243 | } | |
1244 | ||
1245 | iucv_accept_enqueue(sk, nsk); | |
1246 | ||
1247 | /* Wake up accept */ | |
1248 | nsk->sk_state = IUCV_CONNECTED; | |
1249 | sk->sk_data_ready(sk, 1); | |
1250 | err = 0; | |
1251 | fail: | |
1252 | bh_unlock_sock(sk); | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1257 | { | |
1258 | struct sock *sk = path->private; | |
1259 | ||
1260 | sk->sk_state = IUCV_CONNECTED; | |
1261 | sk->sk_state_change(sk); | |
1262 | } | |
1263 | ||
1264 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1265 | { | |
1266 | struct sock *sk = path->private; | |
561e0360 | 1267 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1268 | struct sk_buff *skb; |
1269 | struct sock_msg_q *save_msg; | |
1270 | int len; | |
561e0360 | 1271 | |
eac3731b JH |
1272 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1273 | return; | |
1274 | ||
f0703c80 UB |
1275 | if (!list_empty(&iucv->message_q.list) || |
1276 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1277 | goto save_message; | |
1278 | ||
1279 | len = atomic_read(&sk->sk_rmem_alloc); | |
b8942e3b | 1280 | len += iucv_msg_length(msg) + sizeof(struct sk_buff); |
f0703c80 UB |
1281 | if (len > sk->sk_rcvbuf) |
1282 | goto save_message; | |
1283 | ||
b8942e3b | 1284 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1285 | if (!skb) |
1286 | goto save_message; | |
eac3731b | 1287 | |
f0703c80 UB |
1288 | spin_lock(&iucv->message_q.lock); |
1289 | iucv_process_message(sk, skb, path, msg); | |
1290 | spin_unlock(&iucv->message_q.lock); | |
eac3731b | 1291 | |
f0703c80 UB |
1292 | return; |
1293 | ||
1294 | save_message: | |
1295 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 UB |
1296 | if (!save_msg) |
1297 | return; | |
f0703c80 UB |
1298 | save_msg->path = path; |
1299 | save_msg->msg = *msg; | |
eac3731b | 1300 | |
f0703c80 UB |
1301 | spin_lock(&iucv->message_q.lock); |
1302 | list_add_tail(&save_msg->list, &iucv->message_q.list); | |
1303 | spin_unlock(&iucv->message_q.lock); | |
eac3731b JH |
1304 | } |
1305 | ||
1306 | static void iucv_callback_txdone(struct iucv_path *path, | |
1307 | struct iucv_message *msg) | |
1308 | { | |
1309 | struct sock *sk = path->private; | |
f2a77991 | 1310 | struct sk_buff *this = NULL; |
eac3731b JH |
1311 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1312 | struct sk_buff *list_skb = list->next; | |
1313 | unsigned long flags; | |
1314 | ||
f2a77991 | 1315 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1316 | spin_lock_irqsave(&list->lock, flags); |
1317 | ||
f2a77991 UB |
1318 | while (list_skb != (struct sk_buff *)list) { |
1319 | if (!memcmp(&msg->tag, list_skb->cb, 4)) { | |
1320 | this = list_skb; | |
1321 | break; | |
1322 | } | |
561e0360 | 1323 | list_skb = list_skb->next; |
f2a77991 UB |
1324 | } |
1325 | if (this) | |
1326 | __skb_unlink(this, list); | |
561e0360 JH |
1327 | |
1328 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1329 | |
47a30b26 | 1330 | kfree_skb(this); |
561e0360 | 1331 | } |
c2b4afd2 | 1332 | BUG_ON(!this); |
eac3731b | 1333 | |
da99f056 | 1334 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1335 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1336 | sk->sk_state = IUCV_CLOSED; | |
1337 | sk->sk_state_change(sk); | |
1338 | } | |
1339 | } | |
eac3731b | 1340 | |
eac3731b JH |
1341 | } |
1342 | ||
1343 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1344 | { | |
1345 | struct sock *sk = path->private; | |
1346 | ||
1347 | if (!list_empty(&iucv_sk(sk)->accept_q)) | |
1348 | sk->sk_state = IUCV_SEVERED; | |
1349 | else | |
1350 | sk->sk_state = IUCV_DISCONN; | |
1351 | ||
1352 | sk->sk_state_change(sk); | |
1353 | } | |
1354 | ||
af88b52d HB |
1355 | /* called if the other communication side shuts down its RECV direction; |
1356 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1357 | */ | |
1358 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1359 | { | |
1360 | struct sock *sk = path->private; | |
1361 | ||
1362 | bh_lock_sock(sk); | |
1363 | if (sk->sk_state != IUCV_CLOSED) { | |
1364 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1365 | sk->sk_state_change(sk); | |
1366 | } | |
1367 | bh_unlock_sock(sk); | |
1368 | } | |
1369 | ||
eac3731b JH |
1370 | static struct proto_ops iucv_sock_ops = { |
1371 | .family = PF_IUCV, | |
1372 | .owner = THIS_MODULE, | |
1373 | .release = iucv_sock_release, | |
1374 | .bind = iucv_sock_bind, | |
1375 | .connect = iucv_sock_connect, | |
1376 | .listen = iucv_sock_listen, | |
1377 | .accept = iucv_sock_accept, | |
1378 | .getname = iucv_sock_getname, | |
1379 | .sendmsg = iucv_sock_sendmsg, | |
1380 | .recvmsg = iucv_sock_recvmsg, | |
1381 | .poll = iucv_sock_poll, | |
1382 | .ioctl = sock_no_ioctl, | |
1383 | .mmap = sock_no_mmap, | |
1384 | .socketpair = sock_no_socketpair, | |
1385 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
1386 | .setsockopt = iucv_sock_setsockopt, |
1387 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
1388 | }; |
1389 | ||
1390 | static struct net_proto_family iucv_sock_family_ops = { | |
1391 | .family = AF_IUCV, | |
1392 | .owner = THIS_MODULE, | |
1393 | .create = iucv_sock_create, | |
1394 | }; | |
1395 | ||
da99f056 | 1396 | static int __init afiucv_init(void) |
eac3731b JH |
1397 | { |
1398 | int err; | |
1399 | ||
1400 | if (!MACHINE_IS_VM) { | |
8f7c502c UB |
1401 | pr_err("The af_iucv module cannot be loaded" |
1402 | " without z/VM\n"); | |
eac3731b JH |
1403 | err = -EPROTONOSUPPORT; |
1404 | goto out; | |
1405 | } | |
1406 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
1407 | if (unlikely(err)) { | |
c2b4afd2 | 1408 | WARN_ON(err); |
eac3731b JH |
1409 | err = -EPROTONOSUPPORT; |
1410 | goto out; | |
1411 | } | |
1412 | ||
1413 | err = iucv_register(&af_iucv_handler, 0); | |
1414 | if (err) | |
1415 | goto out; | |
1416 | err = proto_register(&iucv_proto, 0); | |
1417 | if (err) | |
1418 | goto out_iucv; | |
1419 | err = sock_register(&iucv_sock_family_ops); | |
1420 | if (err) | |
1421 | goto out_proto; | |
eac3731b JH |
1422 | return 0; |
1423 | ||
1424 | out_proto: | |
1425 | proto_unregister(&iucv_proto); | |
1426 | out_iucv: | |
1427 | iucv_unregister(&af_iucv_handler, 0); | |
1428 | out: | |
1429 | return err; | |
1430 | } | |
1431 | ||
1432 | static void __exit afiucv_exit(void) | |
1433 | { | |
1434 | sock_unregister(PF_IUCV); | |
1435 | proto_unregister(&iucv_proto); | |
1436 | iucv_unregister(&af_iucv_handler, 0); | |
eac3731b JH |
1437 | } |
1438 | ||
1439 | module_init(afiucv_init); | |
1440 | module_exit(afiucv_exit); | |
1441 | ||
1442 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
1443 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
1444 | MODULE_VERSION(VERSION); | |
1445 | MODULE_LICENSE("GPL"); | |
1446 | MODULE_ALIAS_NETPROTO(PF_IUCV); |