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Commit | Line | Data |
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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 | ||
44b1e6b5 HB |
48 | #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) |
49 | ||
50 | /* macros to set/get socket control buffer at correct offset */ | |
51 | #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */ | |
52 | #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag)) | |
53 | #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ | |
54 | #define CB_TRGCLS_LEN (TRGCLS_SIZE) | |
55 | ||
56 | ||
57f20448 HC |
57 | static void iucv_sock_kill(struct sock *sk); |
58 | static void iucv_sock_close(struct sock *sk); | |
59 | ||
eac3731b JH |
60 | /* Call Back functions */ |
61 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
62 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
63 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
64 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
65 | u8 ipuser[16]); | |
eac3731b | 66 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 67 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
68 | |
69 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 70 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
71 | .autobind_name = ATOMIC_INIT(0) |
72 | }; | |
73 | ||
74 | static struct iucv_handler af_iucv_handler = { | |
75 | .path_pending = iucv_callback_connreq, | |
76 | .path_complete = iucv_callback_connack, | |
77 | .path_severed = iucv_callback_connrej, | |
78 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
79 | .message_complete = iucv_callback_txdone, |
80 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
81 | }; |
82 | ||
83 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
84 | { | |
85 | memcpy(dst, src, 8); | |
86 | } | |
87 | ||
88 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
89 | { | |
90 | memcpy(&dst[8], src, 8); | |
91 | } | |
92 | ||
b8942e3b HB |
93 | /** |
94 | * iucv_msg_length() - Returns the length of an iucv message. | |
95 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
96 | * | |
97 | * The function returns the length of the specified iucv message @msg of data | |
98 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
99 | * | |
100 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
101 | * data: | |
102 | * PRMDATA[0..6] socket data (max 7 bytes); | |
103 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
104 | * | |
105 | * The socket data length is computed by substracting the socket data length | |
106 | * value from 0xFF. | |
107 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
108 | * notifications (see iucv_sock_shutdown); and further, | |
109 | * if the socket data len is > 7, the function returns 8. | |
110 | * | |
111 | * Use this function to allocate socket buffers to store iucv message data. | |
112 | */ | |
113 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
114 | { | |
115 | size_t datalen; | |
116 | ||
117 | if (msg->flags & IUCV_IPRMDATA) { | |
118 | datalen = 0xff - msg->rmmsg[7]; | |
119 | return (datalen < 8) ? datalen : 8; | |
120 | } | |
121 | return msg->length; | |
122 | } | |
123 | ||
eac3731b JH |
124 | /* Timers */ |
125 | static void iucv_sock_timeout(unsigned long arg) | |
126 | { | |
127 | struct sock *sk = (struct sock *)arg; | |
128 | ||
129 | bh_lock_sock(sk); | |
130 | sk->sk_err = ETIMEDOUT; | |
131 | sk->sk_state_change(sk); | |
132 | bh_unlock_sock(sk); | |
133 | ||
134 | iucv_sock_kill(sk); | |
135 | sock_put(sk); | |
136 | } | |
137 | ||
138 | static void iucv_sock_clear_timer(struct sock *sk) | |
139 | { | |
140 | sk_stop_timer(sk, &sk->sk_timer); | |
141 | } | |
142 | ||
eac3731b JH |
143 | static struct sock *__iucv_get_sock_by_name(char *nm) |
144 | { | |
145 | struct sock *sk; | |
146 | struct hlist_node *node; | |
147 | ||
148 | sk_for_each(sk, node, &iucv_sk_list.head) | |
149 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
150 | return sk; | |
151 | ||
152 | return NULL; | |
153 | } | |
154 | ||
155 | static void iucv_sock_destruct(struct sock *sk) | |
156 | { | |
157 | skb_queue_purge(&sk->sk_receive_queue); | |
158 | skb_queue_purge(&sk->sk_write_queue); | |
159 | } | |
160 | ||
161 | /* Cleanup Listen */ | |
162 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
163 | { | |
164 | struct sock *sk; | |
165 | ||
166 | /* Close non-accepted connections */ | |
167 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
168 | iucv_sock_close(sk); | |
169 | iucv_sock_kill(sk); | |
170 | } | |
171 | ||
172 | parent->sk_state = IUCV_CLOSED; | |
173 | sock_set_flag(parent, SOCK_ZAPPED); | |
174 | } | |
175 | ||
176 | /* Kill socket */ | |
177 | static void iucv_sock_kill(struct sock *sk) | |
178 | { | |
179 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
180 | return; | |
181 | ||
182 | iucv_sock_unlink(&iucv_sk_list, sk); | |
183 | sock_set_flag(sk, SOCK_DEAD); | |
184 | sock_put(sk); | |
185 | } | |
186 | ||
187 | /* Close an IUCV socket */ | |
188 | static void iucv_sock_close(struct sock *sk) | |
189 | { | |
190 | unsigned char user_data[16]; | |
191 | struct iucv_sock *iucv = iucv_sk(sk); | |
192 | int err; | |
561e0360 | 193 | unsigned long timeo; |
eac3731b JH |
194 | |
195 | iucv_sock_clear_timer(sk); | |
196 | lock_sock(sk); | |
197 | ||
da99f056 | 198 | switch (sk->sk_state) { |
eac3731b JH |
199 | case IUCV_LISTEN: |
200 | iucv_sock_cleanup_listen(sk); | |
201 | break; | |
202 | ||
203 | case IUCV_CONNECTED: | |
204 | case IUCV_DISCONN: | |
205 | err = 0; | |
561e0360 JH |
206 | |
207 | sk->sk_state = IUCV_CLOSING; | |
208 | sk->sk_state_change(sk); | |
209 | ||
da99f056 | 210 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
211 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
212 | timeo = sk->sk_lingertime; | |
213 | else | |
214 | timeo = IUCV_DISCONN_TIMEOUT; | |
215 | err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo); | |
216 | } | |
217 | ||
bbe188c8 | 218 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
219 | sk->sk_state = IUCV_CLOSED; |
220 | sk->sk_state_change(sk); | |
221 | ||
eac3731b JH |
222 | if (iucv->path) { |
223 | low_nmcpy(user_data, iucv->src_name); | |
224 | high_nmcpy(user_data, iucv->dst_name); | |
225 | ASCEBC(user_data, sizeof(user_data)); | |
226 | err = iucv_path_sever(iucv->path, user_data); | |
227 | iucv_path_free(iucv->path); | |
228 | iucv->path = NULL; | |
229 | } | |
230 | ||
eac3731b JH |
231 | sk->sk_err = ECONNRESET; |
232 | sk->sk_state_change(sk); | |
233 | ||
234 | skb_queue_purge(&iucv->send_skb_q); | |
561e0360 | 235 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b JH |
236 | |
237 | sock_set_flag(sk, SOCK_ZAPPED); | |
238 | break; | |
239 | ||
240 | default: | |
241 | sock_set_flag(sk, SOCK_ZAPPED); | |
242 | break; | |
3ff50b79 | 243 | } |
eac3731b JH |
244 | |
245 | release_sock(sk); | |
246 | iucv_sock_kill(sk); | |
247 | } | |
248 | ||
249 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
250 | { | |
251 | if (parent) | |
252 | sk->sk_type = parent->sk_type; | |
253 | } | |
254 | ||
255 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
256 | { | |
257 | struct sock *sk; | |
258 | ||
6257ff21 | 259 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
260 | if (!sk) |
261 | return NULL; | |
262 | ||
263 | sock_init_data(sock, sk); | |
264 | INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); | |
febca281 | 265 | spin_lock_init(&iucv_sk(sk)->accept_q_lock); |
eac3731b | 266 | skb_queue_head_init(&iucv_sk(sk)->send_skb_q); |
f0703c80 UB |
267 | INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list); |
268 | spin_lock_init(&iucv_sk(sk)->message_q.lock); | |
561e0360 | 269 | skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q); |
eac3731b | 270 | iucv_sk(sk)->send_tag = 0; |
9d5c5d8f | 271 | iucv_sk(sk)->flags = 0; |
09488e2e | 272 | iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT; |
bbe188c8 UB |
273 | iucv_sk(sk)->path = NULL; |
274 | memset(&iucv_sk(sk)->src_user_id , 0, 32); | |
eac3731b JH |
275 | |
276 | sk->sk_destruct = iucv_sock_destruct; | |
277 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
278 | sk->sk_allocation = GFP_DMA; | |
279 | ||
280 | sock_reset_flag(sk, SOCK_ZAPPED); | |
281 | ||
282 | sk->sk_protocol = proto; | |
283 | sk->sk_state = IUCV_OPEN; | |
284 | ||
b24b8a24 | 285 | setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); |
eac3731b JH |
286 | |
287 | iucv_sock_link(&iucv_sk_list, sk); | |
288 | return sk; | |
289 | } | |
290 | ||
291 | /* Create an IUCV socket */ | |
1b8d7ae4 | 292 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol) |
eac3731b JH |
293 | { |
294 | struct sock *sk; | |
295 | ||
aa8e71f5 HB |
296 | if (protocol && protocol != PF_IUCV) |
297 | return -EPROTONOSUPPORT; | |
eac3731b JH |
298 | |
299 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
300 | |
301 | switch (sock->type) { | |
302 | case SOCK_STREAM: | |
303 | sock->ops = &iucv_sock_ops; | |
304 | break; | |
305 | case SOCK_SEQPACKET: | |
306 | /* currently, proto ops can handle both sk types */ | |
307 | sock->ops = &iucv_sock_ops; | |
308 | break; | |
309 | default: | |
310 | return -ESOCKTNOSUPPORT; | |
311 | } | |
eac3731b JH |
312 | |
313 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
314 | if (!sk) | |
315 | return -ENOMEM; | |
316 | ||
317 | iucv_sock_init(sk, NULL); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
323 | { | |
324 | write_lock_bh(&l->lock); | |
325 | sk_add_node(sk, &l->head); | |
326 | write_unlock_bh(&l->lock); | |
327 | } | |
328 | ||
329 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
330 | { | |
331 | write_lock_bh(&l->lock); | |
332 | sk_del_node_init(sk); | |
333 | write_unlock_bh(&l->lock); | |
334 | } | |
335 | ||
336 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
337 | { | |
febca281 UB |
338 | unsigned long flags; |
339 | struct iucv_sock *par = iucv_sk(parent); | |
340 | ||
eac3731b | 341 | sock_hold(sk); |
febca281 UB |
342 | spin_lock_irqsave(&par->accept_q_lock, flags); |
343 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
344 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b JH |
345 | iucv_sk(sk)->parent = parent; |
346 | parent->sk_ack_backlog++; | |
347 | } | |
348 | ||
349 | void iucv_accept_unlink(struct sock *sk) | |
350 | { | |
febca281 UB |
351 | unsigned long flags; |
352 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
353 | ||
354 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 355 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 356 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
eac3731b JH |
357 | iucv_sk(sk)->parent->sk_ack_backlog--; |
358 | iucv_sk(sk)->parent = NULL; | |
359 | sock_put(sk); | |
360 | } | |
361 | ||
362 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
363 | { | |
364 | struct iucv_sock *isk, *n; | |
365 | struct sock *sk; | |
366 | ||
da99f056 | 367 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
368 | sk = (struct sock *) isk; |
369 | lock_sock(sk); | |
370 | ||
371 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 372 | iucv_accept_unlink(sk); |
febca281 | 373 | release_sock(sk); |
eac3731b JH |
374 | continue; |
375 | } | |
376 | ||
377 | if (sk->sk_state == IUCV_CONNECTED || | |
378 | sk->sk_state == IUCV_SEVERED || | |
379 | !newsock) { | |
380 | iucv_accept_unlink(sk); | |
381 | if (newsock) | |
382 | sock_graft(sk, newsock); | |
383 | ||
384 | if (sk->sk_state == IUCV_SEVERED) | |
385 | sk->sk_state = IUCV_DISCONN; | |
386 | ||
387 | release_sock(sk); | |
388 | return sk; | |
389 | } | |
390 | ||
391 | release_sock(sk); | |
392 | } | |
393 | return NULL; | |
394 | } | |
395 | ||
396 | int iucv_sock_wait_state(struct sock *sk, int state, int state2, | |
397 | unsigned long timeo) | |
398 | { | |
399 | DECLARE_WAITQUEUE(wait, current); | |
400 | int err = 0; | |
401 | ||
402 | add_wait_queue(sk->sk_sleep, &wait); | |
403 | while (sk->sk_state != state && sk->sk_state != state2) { | |
404 | set_current_state(TASK_INTERRUPTIBLE); | |
405 | ||
406 | if (!timeo) { | |
407 | err = -EAGAIN; | |
408 | break; | |
409 | } | |
410 | ||
411 | if (signal_pending(current)) { | |
412 | err = sock_intr_errno(timeo); | |
413 | break; | |
414 | } | |
415 | ||
416 | release_sock(sk); | |
417 | timeo = schedule_timeout(timeo); | |
418 | lock_sock(sk); | |
419 | ||
420 | err = sock_error(sk); | |
421 | if (err) | |
422 | break; | |
423 | } | |
424 | set_current_state(TASK_RUNNING); | |
425 | remove_wait_queue(sk->sk_sleep, &wait); | |
426 | return err; | |
427 | } | |
428 | ||
429 | /* Bind an unbound socket */ | |
430 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
431 | int addr_len) | |
432 | { | |
433 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
434 | struct sock *sk = sock->sk; | |
435 | struct iucv_sock *iucv; | |
436 | int err; | |
437 | ||
438 | /* Verify the input sockaddr */ | |
439 | if (!addr || addr->sa_family != AF_IUCV) | |
440 | return -EINVAL; | |
441 | ||
442 | lock_sock(sk); | |
443 | if (sk->sk_state != IUCV_OPEN) { | |
444 | err = -EBADFD; | |
445 | goto done; | |
446 | } | |
447 | ||
448 | write_lock_bh(&iucv_sk_list.lock); | |
449 | ||
450 | iucv = iucv_sk(sk); | |
451 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
452 | err = -EADDRINUSE; | |
453 | goto done_unlock; | |
454 | } | |
455 | if (iucv->path) { | |
456 | err = 0; | |
457 | goto done_unlock; | |
458 | } | |
459 | ||
460 | /* Bind the socket */ | |
461 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
462 | ||
463 | /* Copy the user id */ | |
464 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
465 | sk->sk_state = IUCV_BOUND; | |
466 | err = 0; | |
467 | ||
468 | done_unlock: | |
469 | /* Release the socket list lock */ | |
470 | write_unlock_bh(&iucv_sk_list.lock); | |
471 | done: | |
472 | release_sock(sk); | |
473 | return err; | |
474 | } | |
475 | ||
476 | /* Automatically bind an unbound socket */ | |
477 | static int iucv_sock_autobind(struct sock *sk) | |
478 | { | |
479 | struct iucv_sock *iucv = iucv_sk(sk); | |
480 | char query_buffer[80]; | |
481 | char name[12]; | |
482 | int err = 0; | |
483 | ||
484 | /* Set the userid and name */ | |
485 | cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); | |
486 | if (unlikely(err)) | |
487 | return -EPROTO; | |
488 | ||
489 | memcpy(iucv->src_user_id, query_buffer, 8); | |
490 | ||
491 | write_lock_bh(&iucv_sk_list.lock); | |
492 | ||
493 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
494 | while (__iucv_get_sock_by_name(name)) { | |
495 | sprintf(name, "%08x", | |
496 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
497 | } | |
498 | ||
499 | write_unlock_bh(&iucv_sk_list.lock); | |
500 | ||
501 | memcpy(&iucv->src_name, name, 8); | |
502 | ||
503 | return err; | |
504 | } | |
505 | ||
506 | /* Connect an unconnected socket */ | |
507 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
508 | int alen, int flags) | |
509 | { | |
510 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
511 | struct sock *sk = sock->sk; | |
512 | struct iucv_sock *iucv; | |
513 | unsigned char user_data[16]; | |
514 | int err; | |
515 | ||
516 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
517 | return -EINVAL; | |
518 | ||
519 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
520 | return -EBADFD; | |
521 | ||
aa8e71f5 | 522 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) |
eac3731b JH |
523 | return -EINVAL; |
524 | ||
eac3731b JH |
525 | if (sk->sk_state == IUCV_OPEN) { |
526 | err = iucv_sock_autobind(sk); | |
527 | if (unlikely(err)) | |
528 | return err; | |
529 | } | |
530 | ||
531 | lock_sock(sk); | |
532 | ||
533 | /* Set the destination information */ | |
534 | memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); | |
535 | memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); | |
536 | ||
537 | high_nmcpy(user_data, sa->siucv_name); | |
538 | low_nmcpy(user_data, iucv_sk(sk)->src_name); | |
539 | ASCEBC(user_data, sizeof(user_data)); | |
540 | ||
541 | iucv = iucv_sk(sk); | |
542 | /* Create path. */ | |
09488e2e | 543 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 544 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
545 | if (!iucv->path) { |
546 | err = -ENOMEM; | |
547 | goto done; | |
548 | } | |
eac3731b JH |
549 | err = iucv_path_connect(iucv->path, &af_iucv_handler, |
550 | sa->siucv_user_id, NULL, user_data, sk); | |
551 | if (err) { | |
552 | iucv_path_free(iucv->path); | |
553 | iucv->path = NULL; | |
55cdea9e HB |
554 | switch (err) { |
555 | case 0x0b: /* Target communicator is not logged on */ | |
556 | err = -ENETUNREACH; | |
557 | break; | |
558 | case 0x0d: /* Max connections for this guest exceeded */ | |
559 | case 0x0e: /* Max connections for target guest exceeded */ | |
560 | err = -EAGAIN; | |
561 | break; | |
562 | case 0x0f: /* Missing IUCV authorization */ | |
563 | err = -EACCES; | |
564 | break; | |
565 | default: | |
566 | err = -ECONNREFUSED; | |
567 | break; | |
568 | } | |
eac3731b JH |
569 | goto done; |
570 | } | |
571 | ||
572 | if (sk->sk_state != IUCV_CONNECTED) { | |
573 | err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN, | |
574 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
575 | } | |
576 | ||
577 | if (sk->sk_state == IUCV_DISCONN) { | |
b8942e3b | 578 | err = -ECONNREFUSED; |
eac3731b | 579 | } |
18becbc5 UB |
580 | |
581 | if (err) { | |
582 | iucv_path_sever(iucv->path, NULL); | |
583 | iucv_path_free(iucv->path); | |
584 | iucv->path = NULL; | |
585 | } | |
586 | ||
eac3731b JH |
587 | done: |
588 | release_sock(sk); | |
589 | return err; | |
590 | } | |
591 | ||
592 | /* Move a socket into listening state. */ | |
593 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
594 | { | |
595 | struct sock *sk = sock->sk; | |
596 | int err; | |
597 | ||
598 | lock_sock(sk); | |
599 | ||
600 | err = -EINVAL; | |
aa8e71f5 HB |
601 | if (sk->sk_state != IUCV_BOUND) |
602 | goto done; | |
603 | ||
604 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
605 | goto done; |
606 | ||
607 | sk->sk_max_ack_backlog = backlog; | |
608 | sk->sk_ack_backlog = 0; | |
609 | sk->sk_state = IUCV_LISTEN; | |
610 | err = 0; | |
611 | ||
612 | done: | |
613 | release_sock(sk); | |
614 | return err; | |
615 | } | |
616 | ||
617 | /* Accept a pending connection */ | |
618 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
619 | int flags) | |
620 | { | |
621 | DECLARE_WAITQUEUE(wait, current); | |
622 | struct sock *sk = sock->sk, *nsk; | |
623 | long timeo; | |
624 | int err = 0; | |
625 | ||
561e0360 | 626 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
627 | |
628 | if (sk->sk_state != IUCV_LISTEN) { | |
629 | err = -EBADFD; | |
630 | goto done; | |
631 | } | |
632 | ||
633 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
634 | ||
635 | /* Wait for an incoming connection */ | |
636 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
da99f056 | 637 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
638 | set_current_state(TASK_INTERRUPTIBLE); |
639 | if (!timeo) { | |
640 | err = -EAGAIN; | |
641 | break; | |
642 | } | |
643 | ||
644 | release_sock(sk); | |
645 | timeo = schedule_timeout(timeo); | |
561e0360 | 646 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
647 | |
648 | if (sk->sk_state != IUCV_LISTEN) { | |
649 | err = -EBADFD; | |
650 | break; | |
651 | } | |
652 | ||
653 | if (signal_pending(current)) { | |
654 | err = sock_intr_errno(timeo); | |
655 | break; | |
656 | } | |
657 | } | |
658 | ||
659 | set_current_state(TASK_RUNNING); | |
660 | remove_wait_queue(sk->sk_sleep, &wait); | |
661 | ||
662 | if (err) | |
663 | goto done; | |
664 | ||
665 | newsock->state = SS_CONNECTED; | |
666 | ||
667 | done: | |
668 | release_sock(sk); | |
669 | return err; | |
670 | } | |
671 | ||
672 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
673 | int *len, int peer) | |
674 | { | |
675 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
676 | struct sock *sk = sock->sk; | |
677 | ||
678 | addr->sa_family = AF_IUCV; | |
679 | *len = sizeof(struct sockaddr_iucv); | |
680 | ||
681 | if (peer) { | |
682 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); | |
683 | memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); | |
684 | } else { | |
685 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8); | |
686 | memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); | |
687 | } | |
688 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
689 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
690 | memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
b8942e3b HB |
695 | /** |
696 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
697 | * @path: IUCV path | |
698 | * @msg: Pointer to a struct iucv_message | |
699 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
700 | * | |
701 | * Send the socket data in the parameter list in the iucv message | |
702 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
703 | * list and the socket data len at index 7 (last byte). | |
704 | * See also iucv_msg_length(). | |
705 | * | |
706 | * Returns the error code from the iucv_message_send() call. | |
707 | */ | |
708 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
709 | struct sk_buff *skb) | |
710 | { | |
711 | u8 prmdata[8]; | |
712 | ||
713 | memcpy(prmdata, (void *) skb->data, skb->len); | |
714 | prmdata[7] = 0xff - (u8) skb->len; | |
715 | return iucv_message_send(path, msg, IUCV_IPRMDATA, 0, | |
716 | (void *) prmdata, 8); | |
717 | } | |
718 | ||
eac3731b JH |
719 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
720 | struct msghdr *msg, size_t len) | |
721 | { | |
722 | struct sock *sk = sock->sk; | |
723 | struct iucv_sock *iucv = iucv_sk(sk); | |
724 | struct sk_buff *skb; | |
725 | struct iucv_message txmsg; | |
44b1e6b5 HB |
726 | struct cmsghdr *cmsg; |
727 | int cmsg_done; | |
8f7c502c UB |
728 | char user_id[9]; |
729 | char appl_id[9]; | |
eac3731b JH |
730 | int err; |
731 | ||
732 | err = sock_error(sk); | |
733 | if (err) | |
734 | return err; | |
735 | ||
736 | if (msg->msg_flags & MSG_OOB) | |
737 | return -EOPNOTSUPP; | |
738 | ||
aa8e71f5 HB |
739 | /* SOCK_SEQPACKET: we do not support segmented records */ |
740 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
741 | return -EOPNOTSUPP; | |
742 | ||
eac3731b JH |
743 | lock_sock(sk); |
744 | ||
745 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
746 | err = -EPIPE; | |
747 | goto out; | |
748 | } | |
749 | ||
da99f056 | 750 | if (sk->sk_state == IUCV_CONNECTED) { |
44b1e6b5 HB |
751 | /* initialize defaults */ |
752 | cmsg_done = 0; /* check for duplicate headers */ | |
753 | txmsg.class = 0; | |
754 | ||
755 | /* iterate over control messages */ | |
756 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; | |
757 | cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
758 | ||
759 | if (!CMSG_OK(msg, cmsg)) { | |
760 | err = -EINVAL; | |
761 | goto out; | |
762 | } | |
763 | ||
764 | if (cmsg->cmsg_level != SOL_IUCV) | |
765 | continue; | |
766 | ||
767 | if (cmsg->cmsg_type & cmsg_done) { | |
768 | err = -EINVAL; | |
769 | goto out; | |
770 | } | |
771 | cmsg_done |= cmsg->cmsg_type; | |
772 | ||
773 | switch (cmsg->cmsg_type) { | |
774 | case SCM_IUCV_TRGCLS: | |
775 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
776 | err = -EINVAL; | |
777 | goto out; | |
778 | } | |
779 | ||
780 | /* set iucv message target class */ | |
781 | memcpy(&txmsg.class, | |
782 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
783 | ||
784 | break; | |
785 | ||
786 | default: | |
787 | err = -EINVAL; | |
788 | goto out; | |
789 | break; | |
790 | } | |
791 | } | |
792 | ||
aa8e71f5 HB |
793 | /* allocate one skb for each iucv message: |
794 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
795 | * segmented records using the MSG_EOR flag), but | |
796 | * for SOCK_STREAM we might want to improve it in future */ | |
da99f056 HC |
797 | if (!(skb = sock_alloc_send_skb(sk, len, |
798 | msg->msg_flags & MSG_DONTWAIT, | |
799 | &err))) | |
561e0360 | 800 | goto out; |
eac3731b | 801 | |
da99f056 | 802 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
eac3731b JH |
803 | err = -EFAULT; |
804 | goto fail; | |
805 | } | |
806 | ||
44b1e6b5 | 807 | /* increment and save iucv message tag for msg_completion cbk */ |
eac3731b | 808 | txmsg.tag = iucv->send_tag++; |
44b1e6b5 | 809 | memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); |
eac3731b | 810 | skb_queue_tail(&iucv->send_skb_q, skb); |
b8942e3b HB |
811 | |
812 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) | |
813 | && skb->len <= 7) { | |
814 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
815 | ||
816 | /* on success: there is no message_complete callback | |
817 | * for an IPRMDATA msg; remove skb from send queue */ | |
818 | if (err == 0) { | |
819 | skb_unlink(skb, &iucv->send_skb_q); | |
820 | kfree_skb(skb); | |
821 | } | |
822 | ||
823 | /* this error should never happen since the | |
824 | * IUCV_IPRMDATA path flag is set... sever path */ | |
825 | if (err == 0x15) { | |
826 | iucv_path_sever(iucv->path, NULL); | |
827 | skb_unlink(skb, &iucv->send_skb_q); | |
828 | err = -EPIPE; | |
829 | goto fail; | |
830 | } | |
831 | } else | |
832 | err = iucv_message_send(iucv->path, &txmsg, 0, 0, | |
833 | (void *) skb->data, skb->len); | |
eac3731b | 834 | if (err) { |
8f7c502c UB |
835 | if (err == 3) { |
836 | user_id[8] = 0; | |
837 | memcpy(user_id, iucv->dst_user_id, 8); | |
838 | appl_id[8] = 0; | |
839 | memcpy(appl_id, iucv->dst_name, 8); | |
840 | pr_err("Application %s on z/VM guest %s" | |
841 | " exceeds message limit\n", | |
842 | user_id, appl_id); | |
843 | } | |
eac3731b JH |
844 | skb_unlink(skb, &iucv->send_skb_q); |
845 | err = -EPIPE; | |
846 | goto fail; | |
847 | } | |
848 | ||
849 | } else { | |
850 | err = -ENOTCONN; | |
851 | goto out; | |
852 | } | |
853 | ||
854 | release_sock(sk); | |
855 | return len; | |
856 | ||
857 | fail: | |
858 | kfree_skb(skb); | |
859 | out: | |
860 | release_sock(sk); | |
861 | return err; | |
862 | } | |
863 | ||
f0703c80 UB |
864 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
865 | { | |
866 | int dataleft, size, copied = 0; | |
867 | struct sk_buff *nskb; | |
868 | ||
869 | dataleft = len; | |
870 | while (dataleft) { | |
871 | if (dataleft >= sk->sk_rcvbuf / 4) | |
872 | size = sk->sk_rcvbuf / 4; | |
873 | else | |
874 | size = dataleft; | |
875 | ||
876 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
877 | if (!nskb) | |
878 | return -ENOMEM; | |
879 | ||
44b1e6b5 HB |
880 | /* copy target class to control buffer of new skb */ |
881 | memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); | |
882 | ||
883 | /* copy data fragment */ | |
f0703c80 UB |
884 | memcpy(nskb->data, skb->data + copied, size); |
885 | copied += size; | |
886 | dataleft -= size; | |
887 | ||
888 | skb_reset_transport_header(nskb); | |
889 | skb_reset_network_header(nskb); | |
890 | nskb->len = size; | |
891 | ||
892 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
893 | } | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, | |
899 | struct iucv_path *path, | |
900 | struct iucv_message *msg) | |
901 | { | |
902 | int rc; | |
b8942e3b HB |
903 | unsigned int len; |
904 | ||
905 | len = iucv_msg_length(msg); | |
f0703c80 | 906 | |
44b1e6b5 HB |
907 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
908 | /* Note: the first 4 bytes are reserved for msg tag */ | |
909 | memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); | |
910 | ||
b8942e3b HB |
911 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
912 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
913 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
914 | skb->data = NULL; | |
915 | skb->len = 0; | |
916 | } | |
f0703c80 | 917 | } else { |
b8942e3b HB |
918 | rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA, |
919 | skb->data, len, NULL); | |
f0703c80 UB |
920 | if (rc) { |
921 | kfree_skb(skb); | |
922 | return; | |
923 | } | |
aa8e71f5 HB |
924 | /* we need to fragment iucv messages for SOCK_STREAM only; |
925 | * for SOCK_SEQPACKET, it is only relevant if we support | |
926 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
927 | if (sk->sk_type == SOCK_STREAM && | |
928 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 929 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
930 | kfree_skb(skb); |
931 | skb = NULL; | |
932 | if (rc) { | |
933 | iucv_path_sever(path, NULL); | |
934 | return; | |
935 | } | |
936 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
937 | } else { | |
938 | skb_reset_transport_header(skb); | |
939 | skb_reset_network_header(skb); | |
b8942e3b | 940 | skb->len = len; |
f0703c80 UB |
941 | } |
942 | } | |
943 | ||
944 | if (sock_queue_rcv_skb(sk, skb)) | |
945 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
946 | } | |
947 | ||
948 | static void iucv_process_message_q(struct sock *sk) | |
949 | { | |
950 | struct iucv_sock *iucv = iucv_sk(sk); | |
951 | struct sk_buff *skb; | |
952 | struct sock_msg_q *p, *n; | |
953 | ||
954 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 955 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
956 | if (!skb) |
957 | break; | |
958 | iucv_process_message(sk, skb, p->path, &p->msg); | |
959 | list_del(&p->list); | |
960 | kfree(p); | |
961 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
962 | break; | |
963 | } | |
964 | } | |
965 | ||
eac3731b JH |
966 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
967 | struct msghdr *msg, size_t len, int flags) | |
968 | { | |
969 | int noblock = flags & MSG_DONTWAIT; | |
970 | struct sock *sk = sock->sk; | |
561e0360 | 971 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 972 | unsigned int copied, rlen; |
561e0360 | 973 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b JH |
974 | int err = 0; |
975 | ||
561e0360 | 976 | if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && |
f0703c80 UB |
977 | skb_queue_empty(&iucv->backlog_skb_q) && |
978 | skb_queue_empty(&sk->sk_receive_queue) && | |
979 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
980 | return 0; |
981 | ||
eac3731b JH |
982 | if (flags & (MSG_OOB)) |
983 | return -EOPNOTSUPP; | |
984 | ||
60d3705f HB |
985 | /* receive/dequeue next skb: |
986 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
987 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
988 | if (!skb) { | |
989 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
990 | return 0; | |
991 | return err; | |
992 | } | |
993 | ||
aa8e71f5 HB |
994 | rlen = skb->len; /* real length of skb */ |
995 | copied = min_t(unsigned int, rlen, len); | |
eac3731b | 996 | |
561e0360 JH |
997 | cskb = skb; |
998 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
802788bf HB |
999 | if (!(flags & MSG_PEEK)) |
1000 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1001 | return -EFAULT; | |
eac3731b JH |
1002 | } |
1003 | ||
aa8e71f5 HB |
1004 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1005 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1006 | if (copied < rlen) | |
1007 | msg->msg_flags |= MSG_TRUNC; | |
1008 | /* each iucv message contains a complete record */ | |
1009 | msg->msg_flags |= MSG_EOR; | |
1010 | } | |
eac3731b | 1011 | |
44b1e6b5 HB |
1012 | /* create control message to store iucv msg target class: |
1013 | * get the trgcls from the control buffer of the skb due to | |
1014 | * fragmentation of original iucv message. */ | |
1015 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
1016 | CB_TRGCLS_LEN, CB_TRGCLS(skb)); | |
1017 | if (err) { | |
1018 | if (!(flags & MSG_PEEK)) | |
1019 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1020 | return err; | |
1021 | } | |
1022 | ||
eac3731b JH |
1023 | /* Mark read part of skb as used */ |
1024 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1025 | |
aa8e71f5 HB |
1026 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1027 | if (sk->sk_type == SOCK_STREAM) { | |
1028 | skb_pull(skb, copied); | |
1029 | if (skb->len) { | |
1030 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1031 | goto done; | |
1032 | } | |
eac3731b JH |
1033 | } |
1034 | ||
1035 | kfree_skb(skb); | |
561e0360 JH |
1036 | |
1037 | /* Queue backlog skbs */ | |
f0703c80 | 1038 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1039 | while (rskb) { |
561e0360 | 1040 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1041 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1042 | rskb); |
1043 | break; | |
1044 | } else { | |
f0703c80 | 1045 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1046 | } |
1047 | } | |
f0703c80 UB |
1048 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
1049 | spin_lock_bh(&iucv->message_q.lock); | |
1050 | if (!list_empty(&iucv->message_q.list)) | |
1051 | iucv_process_message_q(sk); | |
1052 | spin_unlock_bh(&iucv->message_q.lock); | |
1053 | } | |
60d3705f | 1054 | } |
eac3731b JH |
1055 | |
1056 | done: | |
aa8e71f5 HB |
1057 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1058 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1059 | copied = rlen; | |
1060 | ||
1061 | return copied; | |
eac3731b JH |
1062 | } |
1063 | ||
1064 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1065 | { | |
1066 | struct iucv_sock *isk, *n; | |
1067 | struct sock *sk; | |
1068 | ||
da99f056 | 1069 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1070 | sk = (struct sock *) isk; |
1071 | ||
1072 | if (sk->sk_state == IUCV_CONNECTED) | |
1073 | return POLLIN | POLLRDNORM; | |
1074 | } | |
1075 | ||
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1080 | poll_table *wait) | |
1081 | { | |
1082 | struct sock *sk = sock->sk; | |
1083 | unsigned int mask = 0; | |
1084 | ||
1085 | poll_wait(file, sk->sk_sleep, wait); | |
1086 | ||
1087 | if (sk->sk_state == IUCV_LISTEN) | |
1088 | return iucv_accept_poll(sk); | |
1089 | ||
1090 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
1091 | mask |= POLLERR; | |
1092 | ||
1093 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1094 | mask |= POLLRDHUP; | |
1095 | ||
1096 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1097 | mask |= POLLHUP; | |
1098 | ||
1099 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1100 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1101 | mask |= POLLIN | POLLRDNORM; |
1102 | ||
1103 | if (sk->sk_state == IUCV_CLOSED) | |
1104 | mask |= POLLHUP; | |
1105 | ||
561e0360 JH |
1106 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) |
1107 | mask |= POLLIN; | |
1108 | ||
eac3731b JH |
1109 | if (sock_writeable(sk)) |
1110 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1111 | else | |
1112 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1113 | ||
1114 | return mask; | |
1115 | } | |
1116 | ||
1117 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1118 | { | |
1119 | struct sock *sk = sock->sk; | |
1120 | struct iucv_sock *iucv = iucv_sk(sk); | |
1121 | struct iucv_message txmsg; | |
1122 | int err = 0; | |
eac3731b JH |
1123 | |
1124 | how++; | |
1125 | ||
1126 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1127 | return -EINVAL; | |
1128 | ||
1129 | lock_sock(sk); | |
da99f056 | 1130 | switch (sk->sk_state) { |
e14ad5fa HB |
1131 | case IUCV_DISCONN: |
1132 | case IUCV_CLOSING: | |
1133 | case IUCV_SEVERED: | |
eac3731b JH |
1134 | case IUCV_CLOSED: |
1135 | err = -ENOTCONN; | |
1136 | goto fail; | |
1137 | ||
1138 | default: | |
1139 | sk->sk_shutdown |= how; | |
1140 | break; | |
1141 | } | |
1142 | ||
1143 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1144 | txmsg.class = 0; | |
1145 | txmsg.tag = 0; | |
1146 | err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, | |
b8942e3b | 1147 | (void *) iprm_shutdown, 8); |
eac3731b | 1148 | if (err) { |
da99f056 | 1149 | switch (err) { |
eac3731b JH |
1150 | case 1: |
1151 | err = -ENOTCONN; | |
1152 | break; | |
1153 | case 2: | |
1154 | err = -ECONNRESET; | |
1155 | break; | |
1156 | default: | |
1157 | err = -ENOTCONN; | |
1158 | break; | |
1159 | } | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1164 | err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); | |
1165 | if (err) | |
1166 | err = -ENOTCONN; | |
1167 | ||
1168 | skb_queue_purge(&sk->sk_receive_queue); | |
1169 | } | |
1170 | ||
1171 | /* Wake up anyone sleeping in poll */ | |
1172 | sk->sk_state_change(sk); | |
1173 | ||
1174 | fail: | |
1175 | release_sock(sk); | |
1176 | return err; | |
1177 | } | |
1178 | ||
1179 | static int iucv_sock_release(struct socket *sock) | |
1180 | { | |
1181 | struct sock *sk = sock->sk; | |
1182 | int err = 0; | |
1183 | ||
1184 | if (!sk) | |
1185 | return 0; | |
1186 | ||
1187 | iucv_sock_close(sk); | |
1188 | ||
1189 | /* Unregister with IUCV base support */ | |
1190 | if (iucv_sk(sk)->path) { | |
1191 | iucv_path_sever(iucv_sk(sk)->path, NULL); | |
1192 | iucv_path_free(iucv_sk(sk)->path); | |
1193 | iucv_sk(sk)->path = NULL; | |
1194 | } | |
1195 | ||
eac3731b JH |
1196 | sock_orphan(sk); |
1197 | iucv_sock_kill(sk); | |
1198 | return err; | |
1199 | } | |
1200 | ||
9d5c5d8f HB |
1201 | /* getsockopt and setsockopt */ |
1202 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
1203 | char __user *optval, int optlen) | |
1204 | { | |
1205 | struct sock *sk = sock->sk; | |
1206 | struct iucv_sock *iucv = iucv_sk(sk); | |
1207 | int val; | |
1208 | int rc; | |
1209 | ||
1210 | if (level != SOL_IUCV) | |
1211 | return -ENOPROTOOPT; | |
1212 | ||
1213 | if (optlen < sizeof(int)) | |
1214 | return -EINVAL; | |
1215 | ||
1216 | if (get_user(val, (int __user *) optval)) | |
1217 | return -EFAULT; | |
1218 | ||
1219 | rc = 0; | |
1220 | ||
1221 | lock_sock(sk); | |
1222 | switch (optname) { | |
1223 | case SO_IPRMDATA_MSG: | |
1224 | if (val) | |
1225 | iucv->flags |= IUCV_IPRMDATA; | |
1226 | else | |
1227 | iucv->flags &= ~IUCV_IPRMDATA; | |
1228 | break; | |
09488e2e HB |
1229 | case SO_MSGLIMIT: |
1230 | switch (sk->sk_state) { | |
1231 | case IUCV_OPEN: | |
1232 | case IUCV_BOUND: | |
1233 | if (val < 1 || val > (u16)(~0)) | |
1234 | rc = -EINVAL; | |
1235 | else | |
1236 | iucv->msglimit = val; | |
1237 | break; | |
1238 | default: | |
1239 | rc = -EINVAL; | |
1240 | break; | |
1241 | } | |
1242 | break; | |
9d5c5d8f HB |
1243 | default: |
1244 | rc = -ENOPROTOOPT; | |
1245 | break; | |
1246 | } | |
1247 | release_sock(sk); | |
1248 | ||
1249 | return rc; | |
1250 | } | |
1251 | ||
1252 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1253 | char __user *optval, int __user *optlen) | |
1254 | { | |
1255 | struct sock *sk = sock->sk; | |
1256 | struct iucv_sock *iucv = iucv_sk(sk); | |
1257 | int val, len; | |
1258 | ||
1259 | if (level != SOL_IUCV) | |
1260 | return -ENOPROTOOPT; | |
1261 | ||
1262 | if (get_user(len, optlen)) | |
1263 | return -EFAULT; | |
1264 | ||
1265 | if (len < 0) | |
1266 | return -EINVAL; | |
1267 | ||
1268 | len = min_t(unsigned int, len, sizeof(int)); | |
1269 | ||
1270 | switch (optname) { | |
1271 | case SO_IPRMDATA_MSG: | |
1272 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1273 | break; | |
09488e2e HB |
1274 | case SO_MSGLIMIT: |
1275 | lock_sock(sk); | |
1276 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1277 | : iucv->msglimit; /* default */ | |
1278 | release_sock(sk); | |
1279 | break; | |
9d5c5d8f HB |
1280 | default: |
1281 | return -ENOPROTOOPT; | |
1282 | } | |
1283 | ||
1284 | if (put_user(len, optlen)) | |
1285 | return -EFAULT; | |
1286 | if (copy_to_user(optval, &val, len)) | |
1287 | return -EFAULT; | |
1288 | ||
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | ||
eac3731b JH |
1293 | /* Callback wrappers - called from iucv base support */ |
1294 | static int iucv_callback_connreq(struct iucv_path *path, | |
1295 | u8 ipvmid[8], u8 ipuser[16]) | |
1296 | { | |
1297 | unsigned char user_data[16]; | |
1298 | unsigned char nuser_data[16]; | |
1299 | unsigned char src_name[8]; | |
1300 | struct hlist_node *node; | |
1301 | struct sock *sk, *nsk; | |
1302 | struct iucv_sock *iucv, *niucv; | |
1303 | int err; | |
1304 | ||
1305 | memcpy(src_name, ipuser, 8); | |
1306 | EBCASC(src_name, 8); | |
1307 | /* Find out if this path belongs to af_iucv. */ | |
1308 | read_lock(&iucv_sk_list.lock); | |
1309 | iucv = NULL; | |
febca281 | 1310 | sk = NULL; |
eac3731b JH |
1311 | sk_for_each(sk, node, &iucv_sk_list.head) |
1312 | if (sk->sk_state == IUCV_LISTEN && | |
1313 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1314 | /* | |
1315 | * Found a listening socket with | |
1316 | * src_name == ipuser[0-7]. | |
1317 | */ | |
1318 | iucv = iucv_sk(sk); | |
1319 | break; | |
1320 | } | |
1321 | read_unlock(&iucv_sk_list.lock); | |
1322 | if (!iucv) | |
1323 | /* No socket found, not one of our paths. */ | |
1324 | return -EINVAL; | |
1325 | ||
1326 | bh_lock_sock(sk); | |
1327 | ||
1328 | /* Check if parent socket is listening */ | |
1329 | low_nmcpy(user_data, iucv->src_name); | |
1330 | high_nmcpy(user_data, iucv->dst_name); | |
1331 | ASCEBC(user_data, sizeof(user_data)); | |
1332 | if (sk->sk_state != IUCV_LISTEN) { | |
1333 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1334 | iucv_path_free(path); |
eac3731b JH |
1335 | goto fail; |
1336 | } | |
1337 | ||
1338 | /* Check for backlog size */ | |
1339 | if (sk_acceptq_is_full(sk)) { | |
1340 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1341 | iucv_path_free(path); |
eac3731b JH |
1342 | goto fail; |
1343 | } | |
1344 | ||
1345 | /* Create the new socket */ | |
aa8e71f5 | 1346 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
da99f056 | 1347 | if (!nsk) { |
eac3731b | 1348 | err = iucv_path_sever(path, user_data); |
65dbd7c2 | 1349 | iucv_path_free(path); |
eac3731b JH |
1350 | goto fail; |
1351 | } | |
1352 | ||
1353 | niucv = iucv_sk(nsk); | |
1354 | iucv_sock_init(nsk, sk); | |
1355 | ||
1356 | /* Set the new iucv_sock */ | |
1357 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1358 | EBCASC(niucv->dst_name, 8); | |
1359 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1360 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1361 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1362 | niucv->path = path; | |
1363 | ||
1364 | /* Call iucv_accept */ | |
1365 | high_nmcpy(nuser_data, ipuser + 8); | |
1366 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1367 | ASCEBC(nuser_data + 8, 8); | |
1368 | ||
09488e2e HB |
1369 | /* set message limit for path based on msglimit of accepting socket */ |
1370 | niucv->msglimit = iucv->msglimit; | |
1371 | path->msglim = iucv->msglimit; | |
eac3731b | 1372 | err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1373 | if (err) { |
eac3731b | 1374 | err = iucv_path_sever(path, user_data); |
65dbd7c2 HB |
1375 | iucv_path_free(path); |
1376 | iucv_sock_kill(nsk); | |
eac3731b JH |
1377 | goto fail; |
1378 | } | |
1379 | ||
1380 | iucv_accept_enqueue(sk, nsk); | |
1381 | ||
1382 | /* Wake up accept */ | |
1383 | nsk->sk_state = IUCV_CONNECTED; | |
1384 | sk->sk_data_ready(sk, 1); | |
1385 | err = 0; | |
1386 | fail: | |
1387 | bh_unlock_sock(sk); | |
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1392 | { | |
1393 | struct sock *sk = path->private; | |
1394 | ||
1395 | sk->sk_state = IUCV_CONNECTED; | |
1396 | sk->sk_state_change(sk); | |
1397 | } | |
1398 | ||
1399 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1400 | { | |
1401 | struct sock *sk = path->private; | |
561e0360 | 1402 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1403 | struct sk_buff *skb; |
1404 | struct sock_msg_q *save_msg; | |
1405 | int len; | |
561e0360 | 1406 | |
fe86e54e HB |
1407 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
1408 | iucv_message_reject(path, msg); | |
eac3731b | 1409 | return; |
fe86e54e | 1410 | } |
eac3731b | 1411 | |
3fa6b5ad | 1412 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1413 | |
f0703c80 UB |
1414 | if (!list_empty(&iucv->message_q.list) || |
1415 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1416 | goto save_message; | |
1417 | ||
1418 | len = atomic_read(&sk->sk_rmem_alloc); | |
b8942e3b | 1419 | len += iucv_msg_length(msg) + sizeof(struct sk_buff); |
f0703c80 UB |
1420 | if (len > sk->sk_rcvbuf) |
1421 | goto save_message; | |
1422 | ||
b8942e3b | 1423 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1424 | if (!skb) |
1425 | goto save_message; | |
eac3731b | 1426 | |
f0703c80 | 1427 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1428 | goto out_unlock; |
eac3731b | 1429 | |
f0703c80 UB |
1430 | save_message: |
1431 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 UB |
1432 | if (!save_msg) |
1433 | return; | |
f0703c80 UB |
1434 | save_msg->path = path; |
1435 | save_msg->msg = *msg; | |
eac3731b | 1436 | |
f0703c80 | 1437 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1438 | |
1439 | out_unlock: | |
f0703c80 | 1440 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1441 | } |
1442 | ||
1443 | static void iucv_callback_txdone(struct iucv_path *path, | |
1444 | struct iucv_message *msg) | |
1445 | { | |
1446 | struct sock *sk = path->private; | |
f2a77991 | 1447 | struct sk_buff *this = NULL; |
eac3731b JH |
1448 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1449 | struct sk_buff *list_skb = list->next; | |
1450 | unsigned long flags; | |
1451 | ||
f2a77991 | 1452 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1453 | spin_lock_irqsave(&list->lock, flags); |
1454 | ||
f2a77991 | 1455 | while (list_skb != (struct sk_buff *)list) { |
44b1e6b5 | 1456 | if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { |
f2a77991 UB |
1457 | this = list_skb; |
1458 | break; | |
1459 | } | |
561e0360 | 1460 | list_skb = list_skb->next; |
f2a77991 UB |
1461 | } |
1462 | if (this) | |
1463 | __skb_unlink(this, list); | |
561e0360 JH |
1464 | |
1465 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1466 | |
47a30b26 | 1467 | kfree_skb(this); |
561e0360 | 1468 | } |
c2b4afd2 | 1469 | BUG_ON(!this); |
eac3731b | 1470 | |
da99f056 | 1471 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1472 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1473 | sk->sk_state = IUCV_CLOSED; | |
1474 | sk->sk_state_change(sk); | |
1475 | } | |
1476 | } | |
eac3731b | 1477 | |
eac3731b JH |
1478 | } |
1479 | ||
1480 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1481 | { | |
1482 | struct sock *sk = path->private; | |
1483 | ||
1484 | if (!list_empty(&iucv_sk(sk)->accept_q)) | |
1485 | sk->sk_state = IUCV_SEVERED; | |
1486 | else | |
1487 | sk->sk_state = IUCV_DISCONN; | |
1488 | ||
1489 | sk->sk_state_change(sk); | |
1490 | } | |
1491 | ||
af88b52d HB |
1492 | /* called if the other communication side shuts down its RECV direction; |
1493 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1494 | */ | |
1495 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1496 | { | |
1497 | struct sock *sk = path->private; | |
1498 | ||
1499 | bh_lock_sock(sk); | |
1500 | if (sk->sk_state != IUCV_CLOSED) { | |
1501 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1502 | sk->sk_state_change(sk); | |
1503 | } | |
1504 | bh_unlock_sock(sk); | |
1505 | } | |
1506 | ||
eac3731b JH |
1507 | static struct proto_ops iucv_sock_ops = { |
1508 | .family = PF_IUCV, | |
1509 | .owner = THIS_MODULE, | |
1510 | .release = iucv_sock_release, | |
1511 | .bind = iucv_sock_bind, | |
1512 | .connect = iucv_sock_connect, | |
1513 | .listen = iucv_sock_listen, | |
1514 | .accept = iucv_sock_accept, | |
1515 | .getname = iucv_sock_getname, | |
1516 | .sendmsg = iucv_sock_sendmsg, | |
1517 | .recvmsg = iucv_sock_recvmsg, | |
1518 | .poll = iucv_sock_poll, | |
1519 | .ioctl = sock_no_ioctl, | |
1520 | .mmap = sock_no_mmap, | |
1521 | .socketpair = sock_no_socketpair, | |
1522 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
1523 | .setsockopt = iucv_sock_setsockopt, |
1524 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
1525 | }; |
1526 | ||
1527 | static struct net_proto_family iucv_sock_family_ops = { | |
1528 | .family = AF_IUCV, | |
1529 | .owner = THIS_MODULE, | |
1530 | .create = iucv_sock_create, | |
1531 | }; | |
1532 | ||
da99f056 | 1533 | static int __init afiucv_init(void) |
eac3731b JH |
1534 | { |
1535 | int err; | |
1536 | ||
1537 | if (!MACHINE_IS_VM) { | |
8f7c502c UB |
1538 | pr_err("The af_iucv module cannot be loaded" |
1539 | " without z/VM\n"); | |
eac3731b JH |
1540 | err = -EPROTONOSUPPORT; |
1541 | goto out; | |
1542 | } | |
1543 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
1544 | if (unlikely(err)) { | |
c2b4afd2 | 1545 | WARN_ON(err); |
eac3731b JH |
1546 | err = -EPROTONOSUPPORT; |
1547 | goto out; | |
1548 | } | |
1549 | ||
1550 | err = iucv_register(&af_iucv_handler, 0); | |
1551 | if (err) | |
1552 | goto out; | |
1553 | err = proto_register(&iucv_proto, 0); | |
1554 | if (err) | |
1555 | goto out_iucv; | |
1556 | err = sock_register(&iucv_sock_family_ops); | |
1557 | if (err) | |
1558 | goto out_proto; | |
eac3731b JH |
1559 | return 0; |
1560 | ||
1561 | out_proto: | |
1562 | proto_unregister(&iucv_proto); | |
1563 | out_iucv: | |
1564 | iucv_unregister(&af_iucv_handler, 0); | |
1565 | out: | |
1566 | return err; | |
1567 | } | |
1568 | ||
1569 | static void __exit afiucv_exit(void) | |
1570 | { | |
1571 | sock_unregister(PF_IUCV); | |
1572 | proto_unregister(&iucv_proto); | |
1573 | iucv_unregister(&af_iucv_handler, 0); | |
eac3731b JH |
1574 | } |
1575 | ||
1576 | module_init(afiucv_init); | |
1577 | module_exit(afiucv_exit); | |
1578 | ||
1579 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
1580 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
1581 | MODULE_VERSION(VERSION); | |
1582 | MODULE_LICENSE("GPL"); | |
1583 | MODULE_ALIAS_NETPROTO(PF_IUCV); |