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Commit | Line | Data |
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eac3731b | 1 | /* |
eac3731b JH |
2 | * IUCV protocol stack for Linux on zSeries |
3 | * | |
c23cad92 | 4 | * Copyright IBM Corp. 2006, 2009 |
eac3731b JH |
5 | * |
6 | * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> | |
c23cad92 UB |
7 | * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> |
8 | * PM functions: | |
9 | * Ursula Braun <ursula.braun@de.ibm.com> | |
eac3731b JH |
10 | */ |
11 | ||
8f7c502c UB |
12 | #define KMSG_COMPONENT "af_iucv" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
eac3731b JH |
15 | #include <linux/module.h> |
16 | #include <linux/types.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/poll.h> | |
25 | #include <net/sock.h> | |
26 | #include <asm/ebcdic.h> | |
27 | #include <asm/cpcmd.h> | |
28 | #include <linux/kmod.h> | |
29 | ||
30 | #include <net/iucv/iucv.h> | |
31 | #include <net/iucv/af_iucv.h> | |
32 | ||
9d5c5d8f | 33 | #define VERSION "1.1" |
eac3731b JH |
34 | |
35 | static char iucv_userid[80]; | |
36 | ||
5708e868 | 37 | static const struct proto_ops iucv_sock_ops; |
eac3731b JH |
38 | |
39 | static struct proto iucv_proto = { | |
40 | .name = "AF_IUCV", | |
41 | .owner = THIS_MODULE, | |
42 | .obj_size = sizeof(struct iucv_sock), | |
43 | }; | |
44 | ||
b8942e3b HB |
45 | /* special AF_IUCV IPRM messages */ |
46 | static const u8 iprm_shutdown[8] = | |
47 | {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; | |
48 | ||
44b1e6b5 HB |
49 | #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) |
50 | ||
51 | /* macros to set/get socket control buffer at correct offset */ | |
52 | #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */ | |
53 | #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag)) | |
54 | #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ | |
55 | #define CB_TRGCLS_LEN (TRGCLS_SIZE) | |
56 | ||
0ea920d2 HB |
57 | #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
58 | do { \ | |
59 | DEFINE_WAIT(__wait); \ | |
60 | long __timeo = timeo; \ | |
61 | ret = 0; \ | |
aa395145 | 62 | prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
0ea920d2 | 63 | while (!(condition)) { \ |
0ea920d2 HB |
64 | if (!__timeo) { \ |
65 | ret = -EAGAIN; \ | |
66 | break; \ | |
67 | } \ | |
68 | if (signal_pending(current)) { \ | |
69 | ret = sock_intr_errno(__timeo); \ | |
70 | break; \ | |
71 | } \ | |
72 | release_sock(sk); \ | |
73 | __timeo = schedule_timeout(__timeo); \ | |
74 | lock_sock(sk); \ | |
75 | ret = sock_error(sk); \ | |
76 | if (ret) \ | |
77 | break; \ | |
78 | } \ | |
aa395145 | 79 | finish_wait(sk_sleep(sk), &__wait); \ |
0ea920d2 HB |
80 | } while (0) |
81 | ||
82 | #define iucv_sock_wait(sk, condition, timeo) \ | |
83 | ({ \ | |
84 | int __ret = 0; \ | |
85 | if (!(condition)) \ | |
86 | __iucv_sock_wait(sk, condition, timeo, __ret); \ | |
87 | __ret; \ | |
88 | }) | |
44b1e6b5 | 89 | |
57f20448 HC |
90 | static void iucv_sock_kill(struct sock *sk); |
91 | static void iucv_sock_close(struct sock *sk); | |
92 | ||
eac3731b JH |
93 | /* Call Back functions */ |
94 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
95 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
96 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
97 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
98 | u8 ipuser[16]); | |
eac3731b | 99 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 100 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
101 | |
102 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 103 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
104 | .autobind_name = ATOMIC_INIT(0) |
105 | }; | |
106 | ||
107 | static struct iucv_handler af_iucv_handler = { | |
108 | .path_pending = iucv_callback_connreq, | |
109 | .path_complete = iucv_callback_connack, | |
110 | .path_severed = iucv_callback_connrej, | |
111 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
112 | .message_complete = iucv_callback_txdone, |
113 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
114 | }; |
115 | ||
116 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
117 | { | |
118 | memcpy(dst, src, 8); | |
119 | } | |
120 | ||
121 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
122 | { | |
123 | memcpy(&dst[8], src, 8); | |
124 | } | |
125 | ||
c23cad92 UB |
126 | static int afiucv_pm_prepare(struct device *dev) |
127 | { | |
128 | #ifdef CONFIG_PM_DEBUG | |
129 | printk(KERN_WARNING "afiucv_pm_prepare\n"); | |
130 | #endif | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static void afiucv_pm_complete(struct device *dev) | |
135 | { | |
136 | #ifdef CONFIG_PM_DEBUG | |
137 | printk(KERN_WARNING "afiucv_pm_complete\n"); | |
138 | #endif | |
c23cad92 UB |
139 | } |
140 | ||
141 | /** | |
142 | * afiucv_pm_freeze() - Freeze PM callback | |
143 | * @dev: AFIUCV dummy device | |
144 | * | |
145 | * Sever all established IUCV communication pathes | |
146 | */ | |
147 | static int afiucv_pm_freeze(struct device *dev) | |
148 | { | |
149 | struct iucv_sock *iucv; | |
150 | struct sock *sk; | |
151 | struct hlist_node *node; | |
152 | int err = 0; | |
153 | ||
154 | #ifdef CONFIG_PM_DEBUG | |
155 | printk(KERN_WARNING "afiucv_pm_freeze\n"); | |
156 | #endif | |
157 | read_lock(&iucv_sk_list.lock); | |
158 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
159 | iucv = iucv_sk(sk); | |
160 | skb_queue_purge(&iucv->send_skb_q); | |
161 | skb_queue_purge(&iucv->backlog_skb_q); | |
162 | switch (sk->sk_state) { | |
163 | case IUCV_SEVERED: | |
164 | case IUCV_DISCONN: | |
165 | case IUCV_CLOSING: | |
166 | case IUCV_CONNECTED: | |
167 | if (iucv->path) { | |
168 | err = iucv_path_sever(iucv->path, NULL); | |
169 | iucv_path_free(iucv->path); | |
170 | iucv->path = NULL; | |
171 | } | |
172 | break; | |
173 | case IUCV_OPEN: | |
174 | case IUCV_BOUND: | |
175 | case IUCV_LISTEN: | |
176 | case IUCV_CLOSED: | |
177 | default: | |
178 | break; | |
179 | } | |
180 | } | |
181 | read_unlock(&iucv_sk_list.lock); | |
182 | return err; | |
183 | } | |
184 | ||
185 | /** | |
186 | * afiucv_pm_restore_thaw() - Thaw and restore PM callback | |
187 | * @dev: AFIUCV dummy device | |
188 | * | |
189 | * socket clean up after freeze | |
190 | */ | |
191 | static int afiucv_pm_restore_thaw(struct device *dev) | |
192 | { | |
c23cad92 UB |
193 | struct sock *sk; |
194 | struct hlist_node *node; | |
195 | ||
196 | #ifdef CONFIG_PM_DEBUG | |
197 | printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); | |
198 | #endif | |
199 | read_lock(&iucv_sk_list.lock); | |
200 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
c23cad92 UB |
201 | switch (sk->sk_state) { |
202 | case IUCV_CONNECTED: | |
203 | sk->sk_err = EPIPE; | |
204 | sk->sk_state = IUCV_DISCONN; | |
205 | sk->sk_state_change(sk); | |
206 | break; | |
207 | case IUCV_DISCONN: | |
208 | case IUCV_SEVERED: | |
209 | case IUCV_CLOSING: | |
210 | case IUCV_LISTEN: | |
211 | case IUCV_BOUND: | |
212 | case IUCV_OPEN: | |
213 | default: | |
214 | break; | |
215 | } | |
216 | } | |
217 | read_unlock(&iucv_sk_list.lock); | |
218 | return 0; | |
219 | } | |
220 | ||
47145210 | 221 | static const struct dev_pm_ops afiucv_pm_ops = { |
c23cad92 UB |
222 | .prepare = afiucv_pm_prepare, |
223 | .complete = afiucv_pm_complete, | |
224 | .freeze = afiucv_pm_freeze, | |
225 | .thaw = afiucv_pm_restore_thaw, | |
226 | .restore = afiucv_pm_restore_thaw, | |
227 | }; | |
228 | ||
229 | static struct device_driver af_iucv_driver = { | |
230 | .owner = THIS_MODULE, | |
231 | .name = "afiucv", | |
232 | .bus = &iucv_bus, | |
233 | .pm = &afiucv_pm_ops, | |
234 | }; | |
235 | ||
236 | /* dummy device used as trigger for PM functions */ | |
237 | static struct device *af_iucv_dev; | |
238 | ||
b8942e3b HB |
239 | /** |
240 | * iucv_msg_length() - Returns the length of an iucv message. | |
241 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
242 | * | |
243 | * The function returns the length of the specified iucv message @msg of data | |
244 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
245 | * | |
246 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
247 | * data: | |
248 | * PRMDATA[0..6] socket data (max 7 bytes); | |
249 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
250 | * | |
25985edc | 251 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
252 | * value from 0xFF. |
253 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
254 | * notifications (see iucv_sock_shutdown); and further, | |
255 | * if the socket data len is > 7, the function returns 8. | |
256 | * | |
257 | * Use this function to allocate socket buffers to store iucv message data. | |
258 | */ | |
259 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
260 | { | |
261 | size_t datalen; | |
262 | ||
263 | if (msg->flags & IUCV_IPRMDATA) { | |
264 | datalen = 0xff - msg->rmmsg[7]; | |
265 | return (datalen < 8) ? datalen : 8; | |
266 | } | |
267 | return msg->length; | |
268 | } | |
269 | ||
0ea920d2 HB |
270 | /** |
271 | * iucv_sock_in_state() - check for specific states | |
272 | * @sk: sock structure | |
273 | * @state: first iucv sk state | |
274 | * @state: second iucv sk state | |
275 | * | |
276 | * Returns true if the socket in either in the first or second state. | |
277 | */ | |
278 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
279 | { | |
280 | return (sk->sk_state == state || sk->sk_state == state2); | |
281 | } | |
282 | ||
283 | /** | |
284 | * iucv_below_msglim() - function to check if messages can be sent | |
285 | * @sk: sock structure | |
286 | * | |
287 | * Returns true if the send queue length is lower than the message limit. | |
288 | * Always returns true if the socket is not connected (no iucv path for | |
289 | * checking the message limit). | |
290 | */ | |
291 | static inline int iucv_below_msglim(struct sock *sk) | |
292 | { | |
293 | struct iucv_sock *iucv = iucv_sk(sk); | |
294 | ||
295 | if (sk->sk_state != IUCV_CONNECTED) | |
296 | return 1; | |
297 | return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); | |
298 | } | |
299 | ||
300 | /** | |
301 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
302 | */ | |
303 | static void iucv_sock_wake_msglim(struct sock *sk) | |
304 | { | |
43815482 ED |
305 | struct socket_wq *wq; |
306 | ||
307 | rcu_read_lock(); | |
308 | wq = rcu_dereference(sk->sk_wq); | |
309 | if (wq_has_sleeper(wq)) | |
310 | wake_up_interruptible_all(&wq->wait); | |
0ea920d2 | 311 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 312 | rcu_read_unlock(); |
0ea920d2 HB |
313 | } |
314 | ||
eac3731b JH |
315 | /* Timers */ |
316 | static void iucv_sock_timeout(unsigned long arg) | |
317 | { | |
318 | struct sock *sk = (struct sock *)arg; | |
319 | ||
320 | bh_lock_sock(sk); | |
321 | sk->sk_err = ETIMEDOUT; | |
322 | sk->sk_state_change(sk); | |
323 | bh_unlock_sock(sk); | |
324 | ||
325 | iucv_sock_kill(sk); | |
326 | sock_put(sk); | |
327 | } | |
328 | ||
329 | static void iucv_sock_clear_timer(struct sock *sk) | |
330 | { | |
331 | sk_stop_timer(sk, &sk->sk_timer); | |
332 | } | |
333 | ||
eac3731b JH |
334 | static struct sock *__iucv_get_sock_by_name(char *nm) |
335 | { | |
336 | struct sock *sk; | |
337 | struct hlist_node *node; | |
338 | ||
339 | sk_for_each(sk, node, &iucv_sk_list.head) | |
340 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
341 | return sk; | |
342 | ||
343 | return NULL; | |
344 | } | |
345 | ||
346 | static void iucv_sock_destruct(struct sock *sk) | |
347 | { | |
348 | skb_queue_purge(&sk->sk_receive_queue); | |
349 | skb_queue_purge(&sk->sk_write_queue); | |
350 | } | |
351 | ||
352 | /* Cleanup Listen */ | |
353 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
354 | { | |
355 | struct sock *sk; | |
356 | ||
357 | /* Close non-accepted connections */ | |
358 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
359 | iucv_sock_close(sk); | |
360 | iucv_sock_kill(sk); | |
361 | } | |
362 | ||
363 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
364 | } |
365 | ||
7514bab0 | 366 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
367 | static void iucv_sock_kill(struct sock *sk) |
368 | { | |
369 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
370 | return; | |
371 | ||
372 | iucv_sock_unlink(&iucv_sk_list, sk); | |
373 | sock_set_flag(sk, SOCK_DEAD); | |
374 | sock_put(sk); | |
375 | } | |
376 | ||
377 | /* Close an IUCV socket */ | |
378 | static void iucv_sock_close(struct sock *sk) | |
379 | { | |
380 | unsigned char user_data[16]; | |
381 | struct iucv_sock *iucv = iucv_sk(sk); | |
561e0360 | 382 | unsigned long timeo; |
eac3731b JH |
383 | |
384 | iucv_sock_clear_timer(sk); | |
385 | lock_sock(sk); | |
386 | ||
da99f056 | 387 | switch (sk->sk_state) { |
eac3731b JH |
388 | case IUCV_LISTEN: |
389 | iucv_sock_cleanup_listen(sk); | |
390 | break; | |
391 | ||
392 | case IUCV_CONNECTED: | |
393 | case IUCV_DISCONN: | |
561e0360 JH |
394 | sk->sk_state = IUCV_CLOSING; |
395 | sk->sk_state_change(sk); | |
396 | ||
da99f056 | 397 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
398 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
399 | timeo = sk->sk_lingertime; | |
400 | else | |
401 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 402 | iucv_sock_wait(sk, |
0ea920d2 HB |
403 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
404 | timeo); | |
561e0360 JH |
405 | } |
406 | ||
bbe188c8 | 407 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
408 | sk->sk_state = IUCV_CLOSED; |
409 | sk->sk_state_change(sk); | |
410 | ||
eac3731b JH |
411 | if (iucv->path) { |
412 | low_nmcpy(user_data, iucv->src_name); | |
413 | high_nmcpy(user_data, iucv->dst_name); | |
414 | ASCEBC(user_data, sizeof(user_data)); | |
9f6298a6 | 415 | iucv_path_sever(iucv->path, user_data); |
eac3731b JH |
416 | iucv_path_free(iucv->path); |
417 | iucv->path = NULL; | |
418 | } | |
419 | ||
eac3731b JH |
420 | sk->sk_err = ECONNRESET; |
421 | sk->sk_state_change(sk); | |
422 | ||
423 | skb_queue_purge(&iucv->send_skb_q); | |
561e0360 | 424 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b JH |
425 | break; |
426 | ||
427 | default: | |
7514bab0 | 428 | /* nothing to do here */ |
eac3731b | 429 | break; |
3ff50b79 | 430 | } |
eac3731b | 431 | |
7514bab0 HB |
432 | /* mark socket for deletion by iucv_sock_kill() */ |
433 | sock_set_flag(sk, SOCK_ZAPPED); | |
434 | ||
eac3731b | 435 | release_sock(sk); |
eac3731b JH |
436 | } |
437 | ||
438 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
439 | { | |
440 | if (parent) | |
441 | sk->sk_type = parent->sk_type; | |
442 | } | |
443 | ||
444 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
445 | { | |
446 | struct sock *sk; | |
447 | ||
6257ff21 | 448 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
449 | if (!sk) |
450 | return NULL; | |
451 | ||
452 | sock_init_data(sock, sk); | |
453 | INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); | |
febca281 | 454 | spin_lock_init(&iucv_sk(sk)->accept_q_lock); |
eac3731b | 455 | skb_queue_head_init(&iucv_sk(sk)->send_skb_q); |
f0703c80 UB |
456 | INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list); |
457 | spin_lock_init(&iucv_sk(sk)->message_q.lock); | |
561e0360 | 458 | skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q); |
eac3731b | 459 | iucv_sk(sk)->send_tag = 0; |
9d5c5d8f | 460 | iucv_sk(sk)->flags = 0; |
09488e2e | 461 | iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT; |
bbe188c8 UB |
462 | iucv_sk(sk)->path = NULL; |
463 | memset(&iucv_sk(sk)->src_user_id , 0, 32); | |
eac3731b JH |
464 | |
465 | sk->sk_destruct = iucv_sock_destruct; | |
466 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
467 | sk->sk_allocation = GFP_DMA; | |
468 | ||
469 | sock_reset_flag(sk, SOCK_ZAPPED); | |
470 | ||
471 | sk->sk_protocol = proto; | |
472 | sk->sk_state = IUCV_OPEN; | |
473 | ||
b24b8a24 | 474 | setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); |
eac3731b JH |
475 | |
476 | iucv_sock_link(&iucv_sk_list, sk); | |
477 | return sk; | |
478 | } | |
479 | ||
480 | /* Create an IUCV socket */ | |
3f378b68 EP |
481 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
482 | int kern) | |
eac3731b JH |
483 | { |
484 | struct sock *sk; | |
485 | ||
aa8e71f5 HB |
486 | if (protocol && protocol != PF_IUCV) |
487 | return -EPROTONOSUPPORT; | |
eac3731b JH |
488 | |
489 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
490 | |
491 | switch (sock->type) { | |
492 | case SOCK_STREAM: | |
493 | sock->ops = &iucv_sock_ops; | |
494 | break; | |
495 | case SOCK_SEQPACKET: | |
496 | /* currently, proto ops can handle both sk types */ | |
497 | sock->ops = &iucv_sock_ops; | |
498 | break; | |
499 | default: | |
500 | return -ESOCKTNOSUPPORT; | |
501 | } | |
eac3731b JH |
502 | |
503 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
504 | if (!sk) | |
505 | return -ENOMEM; | |
506 | ||
507 | iucv_sock_init(sk, NULL); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
513 | { | |
514 | write_lock_bh(&l->lock); | |
515 | sk_add_node(sk, &l->head); | |
516 | write_unlock_bh(&l->lock); | |
517 | } | |
518 | ||
519 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
520 | { | |
521 | write_lock_bh(&l->lock); | |
522 | sk_del_node_init(sk); | |
523 | write_unlock_bh(&l->lock); | |
524 | } | |
525 | ||
526 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
527 | { | |
febca281 UB |
528 | unsigned long flags; |
529 | struct iucv_sock *par = iucv_sk(parent); | |
530 | ||
eac3731b | 531 | sock_hold(sk); |
febca281 UB |
532 | spin_lock_irqsave(&par->accept_q_lock, flags); |
533 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
534 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 535 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 536 | sk_acceptq_added(parent); |
eac3731b JH |
537 | } |
538 | ||
539 | void iucv_accept_unlink(struct sock *sk) | |
540 | { | |
febca281 UB |
541 | unsigned long flags; |
542 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
543 | ||
544 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 545 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 546 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 547 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
548 | iucv_sk(sk)->parent = NULL; |
549 | sock_put(sk); | |
550 | } | |
551 | ||
552 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
553 | { | |
554 | struct iucv_sock *isk, *n; | |
555 | struct sock *sk; | |
556 | ||
da99f056 | 557 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
558 | sk = (struct sock *) isk; |
559 | lock_sock(sk); | |
560 | ||
561 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 562 | iucv_accept_unlink(sk); |
febca281 | 563 | release_sock(sk); |
eac3731b JH |
564 | continue; |
565 | } | |
566 | ||
567 | if (sk->sk_state == IUCV_CONNECTED || | |
568 | sk->sk_state == IUCV_SEVERED || | |
56a73de3 | 569 | sk->sk_state == IUCV_DISCONN || /* due to PM restore */ |
eac3731b JH |
570 | !newsock) { |
571 | iucv_accept_unlink(sk); | |
572 | if (newsock) | |
573 | sock_graft(sk, newsock); | |
574 | ||
575 | if (sk->sk_state == IUCV_SEVERED) | |
576 | sk->sk_state = IUCV_DISCONN; | |
577 | ||
578 | release_sock(sk); | |
579 | return sk; | |
580 | } | |
581 | ||
582 | release_sock(sk); | |
583 | } | |
584 | return NULL; | |
585 | } | |
586 | ||
eac3731b JH |
587 | /* Bind an unbound socket */ |
588 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
589 | int addr_len) | |
590 | { | |
591 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
592 | struct sock *sk = sock->sk; | |
593 | struct iucv_sock *iucv; | |
594 | int err; | |
595 | ||
596 | /* Verify the input sockaddr */ | |
597 | if (!addr || addr->sa_family != AF_IUCV) | |
598 | return -EINVAL; | |
599 | ||
600 | lock_sock(sk); | |
601 | if (sk->sk_state != IUCV_OPEN) { | |
602 | err = -EBADFD; | |
603 | goto done; | |
604 | } | |
605 | ||
606 | write_lock_bh(&iucv_sk_list.lock); | |
607 | ||
608 | iucv = iucv_sk(sk); | |
609 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
610 | err = -EADDRINUSE; | |
611 | goto done_unlock; | |
612 | } | |
613 | if (iucv->path) { | |
614 | err = 0; | |
615 | goto done_unlock; | |
616 | } | |
617 | ||
618 | /* Bind the socket */ | |
619 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
620 | ||
621 | /* Copy the user id */ | |
622 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
623 | sk->sk_state = IUCV_BOUND; | |
624 | err = 0; | |
625 | ||
626 | done_unlock: | |
627 | /* Release the socket list lock */ | |
628 | write_unlock_bh(&iucv_sk_list.lock); | |
629 | done: | |
630 | release_sock(sk); | |
631 | return err; | |
632 | } | |
633 | ||
634 | /* Automatically bind an unbound socket */ | |
635 | static int iucv_sock_autobind(struct sock *sk) | |
636 | { | |
637 | struct iucv_sock *iucv = iucv_sk(sk); | |
638 | char query_buffer[80]; | |
639 | char name[12]; | |
640 | int err = 0; | |
641 | ||
642 | /* Set the userid and name */ | |
643 | cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); | |
644 | if (unlikely(err)) | |
645 | return -EPROTO; | |
646 | ||
647 | memcpy(iucv->src_user_id, query_buffer, 8); | |
648 | ||
649 | write_lock_bh(&iucv_sk_list.lock); | |
650 | ||
651 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
652 | while (__iucv_get_sock_by_name(name)) { | |
653 | sprintf(name, "%08x", | |
654 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
655 | } | |
656 | ||
657 | write_unlock_bh(&iucv_sk_list.lock); | |
658 | ||
659 | memcpy(&iucv->src_name, name, 8); | |
660 | ||
661 | return err; | |
662 | } | |
663 | ||
664 | /* Connect an unconnected socket */ | |
665 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
666 | int alen, int flags) | |
667 | { | |
668 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
669 | struct sock *sk = sock->sk; | |
670 | struct iucv_sock *iucv; | |
671 | unsigned char user_data[16]; | |
672 | int err; | |
673 | ||
674 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
675 | return -EINVAL; | |
676 | ||
677 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
678 | return -EBADFD; | |
679 | ||
aa8e71f5 | 680 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) |
eac3731b JH |
681 | return -EINVAL; |
682 | ||
eac3731b JH |
683 | if (sk->sk_state == IUCV_OPEN) { |
684 | err = iucv_sock_autobind(sk); | |
685 | if (unlikely(err)) | |
686 | return err; | |
687 | } | |
688 | ||
689 | lock_sock(sk); | |
690 | ||
691 | /* Set the destination information */ | |
692 | memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); | |
693 | memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); | |
694 | ||
695 | high_nmcpy(user_data, sa->siucv_name); | |
696 | low_nmcpy(user_data, iucv_sk(sk)->src_name); | |
697 | ASCEBC(user_data, sizeof(user_data)); | |
698 | ||
699 | iucv = iucv_sk(sk); | |
700 | /* Create path. */ | |
09488e2e | 701 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 702 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
703 | if (!iucv->path) { |
704 | err = -ENOMEM; | |
705 | goto done; | |
706 | } | |
eac3731b JH |
707 | err = iucv_path_connect(iucv->path, &af_iucv_handler, |
708 | sa->siucv_user_id, NULL, user_data, sk); | |
709 | if (err) { | |
710 | iucv_path_free(iucv->path); | |
711 | iucv->path = NULL; | |
55cdea9e HB |
712 | switch (err) { |
713 | case 0x0b: /* Target communicator is not logged on */ | |
714 | err = -ENETUNREACH; | |
715 | break; | |
716 | case 0x0d: /* Max connections for this guest exceeded */ | |
717 | case 0x0e: /* Max connections for target guest exceeded */ | |
718 | err = -EAGAIN; | |
719 | break; | |
720 | case 0x0f: /* Missing IUCV authorization */ | |
721 | err = -EACCES; | |
722 | break; | |
723 | default: | |
724 | err = -ECONNREFUSED; | |
725 | break; | |
726 | } | |
eac3731b JH |
727 | goto done; |
728 | } | |
729 | ||
730 | if (sk->sk_state != IUCV_CONNECTED) { | |
0ea920d2 HB |
731 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
732 | IUCV_DISCONN), | |
733 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b JH |
734 | } |
735 | ||
736 | if (sk->sk_state == IUCV_DISCONN) { | |
b8942e3b | 737 | err = -ECONNREFUSED; |
eac3731b | 738 | } |
18becbc5 UB |
739 | |
740 | if (err) { | |
741 | iucv_path_sever(iucv->path, NULL); | |
742 | iucv_path_free(iucv->path); | |
743 | iucv->path = NULL; | |
744 | } | |
745 | ||
eac3731b JH |
746 | done: |
747 | release_sock(sk); | |
748 | return err; | |
749 | } | |
750 | ||
751 | /* Move a socket into listening state. */ | |
752 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
753 | { | |
754 | struct sock *sk = sock->sk; | |
755 | int err; | |
756 | ||
757 | lock_sock(sk); | |
758 | ||
759 | err = -EINVAL; | |
aa8e71f5 HB |
760 | if (sk->sk_state != IUCV_BOUND) |
761 | goto done; | |
762 | ||
763 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
764 | goto done; |
765 | ||
766 | sk->sk_max_ack_backlog = backlog; | |
767 | sk->sk_ack_backlog = 0; | |
768 | sk->sk_state = IUCV_LISTEN; | |
769 | err = 0; | |
770 | ||
771 | done: | |
772 | release_sock(sk); | |
773 | return err; | |
774 | } | |
775 | ||
776 | /* Accept a pending connection */ | |
777 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
778 | int flags) | |
779 | { | |
780 | DECLARE_WAITQUEUE(wait, current); | |
781 | struct sock *sk = sock->sk, *nsk; | |
782 | long timeo; | |
783 | int err = 0; | |
784 | ||
561e0360 | 785 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
786 | |
787 | if (sk->sk_state != IUCV_LISTEN) { | |
788 | err = -EBADFD; | |
789 | goto done; | |
790 | } | |
791 | ||
792 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
793 | ||
794 | /* Wait for an incoming connection */ | |
aa395145 | 795 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 796 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
797 | set_current_state(TASK_INTERRUPTIBLE); |
798 | if (!timeo) { | |
799 | err = -EAGAIN; | |
800 | break; | |
801 | } | |
802 | ||
803 | release_sock(sk); | |
804 | timeo = schedule_timeout(timeo); | |
561e0360 | 805 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
806 | |
807 | if (sk->sk_state != IUCV_LISTEN) { | |
808 | err = -EBADFD; | |
809 | break; | |
810 | } | |
811 | ||
812 | if (signal_pending(current)) { | |
813 | err = sock_intr_errno(timeo); | |
814 | break; | |
815 | } | |
816 | } | |
817 | ||
818 | set_current_state(TASK_RUNNING); | |
aa395145 | 819 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
820 | |
821 | if (err) | |
822 | goto done; | |
823 | ||
824 | newsock->state = SS_CONNECTED; | |
825 | ||
826 | done: | |
827 | release_sock(sk); | |
828 | return err; | |
829 | } | |
830 | ||
831 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
832 | int *len, int peer) | |
833 | { | |
834 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
835 | struct sock *sk = sock->sk; | |
836 | ||
837 | addr->sa_family = AF_IUCV; | |
838 | *len = sizeof(struct sockaddr_iucv); | |
839 | ||
840 | if (peer) { | |
841 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); | |
842 | memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); | |
843 | } else { | |
844 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8); | |
845 | memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); | |
846 | } | |
847 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
848 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
849 | memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); | |
850 | ||
851 | return 0; | |
852 | } | |
853 | ||
b8942e3b HB |
854 | /** |
855 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
856 | * @path: IUCV path | |
857 | * @msg: Pointer to a struct iucv_message | |
858 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
859 | * | |
860 | * Send the socket data in the parameter list in the iucv message | |
861 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
862 | * list and the socket data len at index 7 (last byte). | |
863 | * See also iucv_msg_length(). | |
864 | * | |
865 | * Returns the error code from the iucv_message_send() call. | |
866 | */ | |
867 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
868 | struct sk_buff *skb) | |
869 | { | |
870 | u8 prmdata[8]; | |
871 | ||
872 | memcpy(prmdata, (void *) skb->data, skb->len); | |
873 | prmdata[7] = 0xff - (u8) skb->len; | |
874 | return iucv_message_send(path, msg, IUCV_IPRMDATA, 0, | |
875 | (void *) prmdata, 8); | |
876 | } | |
877 | ||
eac3731b JH |
878 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
879 | struct msghdr *msg, size_t len) | |
880 | { | |
881 | struct sock *sk = sock->sk; | |
882 | struct iucv_sock *iucv = iucv_sk(sk); | |
883 | struct sk_buff *skb; | |
884 | struct iucv_message txmsg; | |
44b1e6b5 HB |
885 | struct cmsghdr *cmsg; |
886 | int cmsg_done; | |
0ea920d2 | 887 | long timeo; |
8f7c502c UB |
888 | char user_id[9]; |
889 | char appl_id[9]; | |
eac3731b | 890 | int err; |
0ea920d2 | 891 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
892 | |
893 | err = sock_error(sk); | |
894 | if (err) | |
895 | return err; | |
896 | ||
897 | if (msg->msg_flags & MSG_OOB) | |
898 | return -EOPNOTSUPP; | |
899 | ||
aa8e71f5 HB |
900 | /* SOCK_SEQPACKET: we do not support segmented records */ |
901 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
902 | return -EOPNOTSUPP; | |
903 | ||
eac3731b JH |
904 | lock_sock(sk); |
905 | ||
906 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
907 | err = -EPIPE; | |
908 | goto out; | |
909 | } | |
910 | ||
bb664f49 HB |
911 | /* Return if the socket is not in connected state */ |
912 | if (sk->sk_state != IUCV_CONNECTED) { | |
913 | err = -ENOTCONN; | |
914 | goto out; | |
915 | } | |
44b1e6b5 | 916 | |
bb664f49 HB |
917 | /* initialize defaults */ |
918 | cmsg_done = 0; /* check for duplicate headers */ | |
919 | txmsg.class = 0; | |
44b1e6b5 | 920 | |
bb664f49 HB |
921 | /* iterate over control messages */ |
922 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; | |
923 | cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
44b1e6b5 | 924 | |
bb664f49 HB |
925 | if (!CMSG_OK(msg, cmsg)) { |
926 | err = -EINVAL; | |
927 | goto out; | |
928 | } | |
44b1e6b5 | 929 | |
bb664f49 HB |
930 | if (cmsg->cmsg_level != SOL_IUCV) |
931 | continue; | |
44b1e6b5 | 932 | |
bb664f49 HB |
933 | if (cmsg->cmsg_type & cmsg_done) { |
934 | err = -EINVAL; | |
935 | goto out; | |
936 | } | |
937 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 938 | |
bb664f49 HB |
939 | switch (cmsg->cmsg_type) { |
940 | case SCM_IUCV_TRGCLS: | |
941 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
942 | err = -EINVAL; |
943 | goto out; | |
944 | } | |
44b1e6b5 | 945 | |
bb664f49 HB |
946 | /* set iucv message target class */ |
947 | memcpy(&txmsg.class, | |
948 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 949 | |
bb664f49 | 950 | break; |
44b1e6b5 | 951 | |
bb664f49 HB |
952 | default: |
953 | err = -EINVAL; | |
954 | goto out; | |
955 | break; | |
44b1e6b5 | 956 | } |
bb664f49 | 957 | } |
44b1e6b5 | 958 | |
bb664f49 HB |
959 | /* allocate one skb for each iucv message: |
960 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
961 | * segmented records using the MSG_EOR flag), but | |
962 | * for SOCK_STREAM we might want to improve it in future */ | |
0ea920d2 | 963 | skb = sock_alloc_send_skb(sk, len, noblock, &err); |
bb664f49 HB |
964 | if (!skb) |
965 | goto out; | |
966 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { | |
967 | err = -EFAULT; | |
968 | goto fail; | |
969 | } | |
eac3731b | 970 | |
0ea920d2 HB |
971 | /* wait if outstanding messages for iucv path has reached */ |
972 | timeo = sock_sndtimeo(sk, noblock); | |
973 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
974 | if (err) | |
975 | goto fail; | |
eac3731b | 976 | |
0ea920d2 HB |
977 | /* return -ECONNRESET if the socket is no longer connected */ |
978 | if (sk->sk_state != IUCV_CONNECTED) { | |
979 | err = -ECONNRESET; | |
980 | goto fail; | |
981 | } | |
b8942e3b | 982 | |
bb664f49 HB |
983 | /* increment and save iucv message tag for msg_completion cbk */ |
984 | txmsg.tag = iucv->send_tag++; | |
985 | memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); | |
986 | skb_queue_tail(&iucv->send_skb_q, skb); | |
b8942e3b | 987 | |
bb664f49 HB |
988 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
989 | && skb->len <= 7) { | |
990 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 991 | |
bb664f49 HB |
992 | /* on success: there is no message_complete callback |
993 | * for an IPRMDATA msg; remove skb from send queue */ | |
994 | if (err == 0) { | |
995 | skb_unlink(skb, &iucv->send_skb_q); | |
996 | kfree_skb(skb); | |
997 | } | |
998 | ||
999 | /* this error should never happen since the | |
1000 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1001 | if (err == 0x15) { | |
1002 | iucv_path_sever(iucv->path, NULL); | |
eac3731b JH |
1003 | skb_unlink(skb, &iucv->send_skb_q); |
1004 | err = -EPIPE; | |
1005 | goto fail; | |
1006 | } | |
bb664f49 HB |
1007 | } else |
1008 | err = iucv_message_send(iucv->path, &txmsg, 0, 0, | |
1009 | (void *) skb->data, skb->len); | |
1010 | if (err) { | |
1011 | if (err == 3) { | |
1012 | user_id[8] = 0; | |
1013 | memcpy(user_id, iucv->dst_user_id, 8); | |
1014 | appl_id[8] = 0; | |
1015 | memcpy(appl_id, iucv->dst_name, 8); | |
1016 | pr_err("Application %s on z/VM guest %s" | |
1017 | " exceeds message limit\n", | |
1018 | appl_id, user_id); | |
0ea920d2 HB |
1019 | err = -EAGAIN; |
1020 | } else | |
1021 | err = -EPIPE; | |
bb664f49 | 1022 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1023 | goto fail; |
eac3731b JH |
1024 | } |
1025 | ||
1026 | release_sock(sk); | |
1027 | return len; | |
1028 | ||
1029 | fail: | |
1030 | kfree_skb(skb); | |
1031 | out: | |
1032 | release_sock(sk); | |
1033 | return err; | |
1034 | } | |
1035 | ||
bf95d20f HB |
1036 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1037 | * | |
1038 | * Locking: must be called with message_q.lock held | |
1039 | */ | |
f0703c80 UB |
1040 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1041 | { | |
1042 | int dataleft, size, copied = 0; | |
1043 | struct sk_buff *nskb; | |
1044 | ||
1045 | dataleft = len; | |
1046 | while (dataleft) { | |
1047 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1048 | size = sk->sk_rcvbuf / 4; | |
1049 | else | |
1050 | size = dataleft; | |
1051 | ||
1052 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1053 | if (!nskb) | |
1054 | return -ENOMEM; | |
1055 | ||
44b1e6b5 HB |
1056 | /* copy target class to control buffer of new skb */ |
1057 | memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); | |
1058 | ||
1059 | /* copy data fragment */ | |
f0703c80 UB |
1060 | memcpy(nskb->data, skb->data + copied, size); |
1061 | copied += size; | |
1062 | dataleft -= size; | |
1063 | ||
1064 | skb_reset_transport_header(nskb); | |
1065 | skb_reset_network_header(nskb); | |
1066 | nskb->len = size; | |
1067 | ||
1068 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1069 | } | |
1070 | ||
1071 | return 0; | |
1072 | } | |
1073 | ||
bf95d20f HB |
1074 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1075 | * | |
1076 | * Locking: must be called with message_q.lock held | |
1077 | */ | |
f0703c80 UB |
1078 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1079 | struct iucv_path *path, | |
1080 | struct iucv_message *msg) | |
1081 | { | |
1082 | int rc; | |
b8942e3b HB |
1083 | unsigned int len; |
1084 | ||
1085 | len = iucv_msg_length(msg); | |
f0703c80 | 1086 | |
44b1e6b5 HB |
1087 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1088 | /* Note: the first 4 bytes are reserved for msg tag */ | |
1089 | memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); | |
1090 | ||
b8942e3b HB |
1091 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1092 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1093 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1094 | skb->data = NULL; | |
1095 | skb->len = 0; | |
1096 | } | |
f0703c80 | 1097 | } else { |
b8942e3b HB |
1098 | rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA, |
1099 | skb->data, len, NULL); | |
f0703c80 UB |
1100 | if (rc) { |
1101 | kfree_skb(skb); | |
1102 | return; | |
1103 | } | |
aa8e71f5 HB |
1104 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1105 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1106 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1107 | if (sk->sk_type == SOCK_STREAM && | |
1108 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1109 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1110 | kfree_skb(skb); |
1111 | skb = NULL; | |
1112 | if (rc) { | |
1113 | iucv_path_sever(path, NULL); | |
1114 | return; | |
1115 | } | |
1116 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1117 | } else { | |
1118 | skb_reset_transport_header(skb); | |
1119 | skb_reset_network_header(skb); | |
b8942e3b | 1120 | skb->len = len; |
f0703c80 UB |
1121 | } |
1122 | } | |
1123 | ||
1124 | if (sock_queue_rcv_skb(sk, skb)) | |
1125 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1126 | } | |
1127 | ||
bf95d20f HB |
1128 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1129 | * | |
1130 | * Locking: must be called with message_q.lock held | |
1131 | */ | |
f0703c80 UB |
1132 | static void iucv_process_message_q(struct sock *sk) |
1133 | { | |
1134 | struct iucv_sock *iucv = iucv_sk(sk); | |
1135 | struct sk_buff *skb; | |
1136 | struct sock_msg_q *p, *n; | |
1137 | ||
1138 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1139 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1140 | if (!skb) |
1141 | break; | |
1142 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1143 | list_del(&p->list); | |
1144 | kfree(p); | |
1145 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1146 | break; | |
1147 | } | |
1148 | } | |
1149 | ||
eac3731b JH |
1150 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1151 | struct msghdr *msg, size_t len, int flags) | |
1152 | { | |
1153 | int noblock = flags & MSG_DONTWAIT; | |
1154 | struct sock *sk = sock->sk; | |
561e0360 | 1155 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1156 | unsigned int copied, rlen; |
561e0360 | 1157 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b JH |
1158 | int err = 0; |
1159 | ||
561e0360 | 1160 | if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && |
f0703c80 UB |
1161 | skb_queue_empty(&iucv->backlog_skb_q) && |
1162 | skb_queue_empty(&sk->sk_receive_queue) && | |
1163 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1164 | return 0; |
1165 | ||
eac3731b JH |
1166 | if (flags & (MSG_OOB)) |
1167 | return -EOPNOTSUPP; | |
1168 | ||
60d3705f HB |
1169 | /* receive/dequeue next skb: |
1170 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1171 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1172 | if (!skb) { | |
1173 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1174 | return 0; | |
1175 | return err; | |
1176 | } | |
1177 | ||
aa8e71f5 HB |
1178 | rlen = skb->len; /* real length of skb */ |
1179 | copied = min_t(unsigned int, rlen, len); | |
eac3731b | 1180 | |
561e0360 JH |
1181 | cskb = skb; |
1182 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
802788bf HB |
1183 | if (!(flags & MSG_PEEK)) |
1184 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1185 | return -EFAULT; | |
eac3731b JH |
1186 | } |
1187 | ||
aa8e71f5 HB |
1188 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1189 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1190 | if (copied < rlen) | |
1191 | msg->msg_flags |= MSG_TRUNC; | |
1192 | /* each iucv message contains a complete record */ | |
1193 | msg->msg_flags |= MSG_EOR; | |
1194 | } | |
eac3731b | 1195 | |
44b1e6b5 HB |
1196 | /* create control message to store iucv msg target class: |
1197 | * get the trgcls from the control buffer of the skb due to | |
1198 | * fragmentation of original iucv message. */ | |
1199 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
1200 | CB_TRGCLS_LEN, CB_TRGCLS(skb)); | |
1201 | if (err) { | |
1202 | if (!(flags & MSG_PEEK)) | |
1203 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1204 | return err; | |
1205 | } | |
1206 | ||
eac3731b JH |
1207 | /* Mark read part of skb as used */ |
1208 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1209 | |
aa8e71f5 HB |
1210 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1211 | if (sk->sk_type == SOCK_STREAM) { | |
1212 | skb_pull(skb, copied); | |
1213 | if (skb->len) { | |
1214 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1215 | goto done; | |
1216 | } | |
eac3731b JH |
1217 | } |
1218 | ||
1219 | kfree_skb(skb); | |
561e0360 JH |
1220 | |
1221 | /* Queue backlog skbs */ | |
bf95d20f | 1222 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1223 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1224 | while (rskb) { |
561e0360 | 1225 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1226 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1227 | rskb); |
1228 | break; | |
1229 | } else { | |
f0703c80 | 1230 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1231 | } |
1232 | } | |
f0703c80 | 1233 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1234 | if (!list_empty(&iucv->message_q.list)) |
1235 | iucv_process_message_q(sk); | |
f0703c80 | 1236 | } |
bf95d20f | 1237 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1238 | } |
eac3731b JH |
1239 | |
1240 | done: | |
aa8e71f5 HB |
1241 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1242 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1243 | copied = rlen; | |
1244 | ||
1245 | return copied; | |
eac3731b JH |
1246 | } |
1247 | ||
1248 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1249 | { | |
1250 | struct iucv_sock *isk, *n; | |
1251 | struct sock *sk; | |
1252 | ||
da99f056 | 1253 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1254 | sk = (struct sock *) isk; |
1255 | ||
1256 | if (sk->sk_state == IUCV_CONNECTED) | |
1257 | return POLLIN | POLLRDNORM; | |
1258 | } | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1264 | poll_table *wait) | |
1265 | { | |
1266 | struct sock *sk = sock->sk; | |
1267 | unsigned int mask = 0; | |
1268 | ||
aa395145 | 1269 | sock_poll_wait(file, sk_sleep(sk), wait); |
eac3731b JH |
1270 | |
1271 | if (sk->sk_state == IUCV_LISTEN) | |
1272 | return iucv_accept_poll(sk); | |
1273 | ||
1274 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
1275 | mask |= POLLERR; | |
1276 | ||
1277 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1278 | mask |= POLLRDHUP; | |
1279 | ||
1280 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1281 | mask |= POLLHUP; | |
1282 | ||
1283 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1284 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1285 | mask |= POLLIN | POLLRDNORM; |
1286 | ||
1287 | if (sk->sk_state == IUCV_CLOSED) | |
1288 | mask |= POLLHUP; | |
1289 | ||
561e0360 JH |
1290 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) |
1291 | mask |= POLLIN; | |
1292 | ||
eac3731b JH |
1293 | if (sock_writeable(sk)) |
1294 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1295 | else | |
1296 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1297 | ||
1298 | return mask; | |
1299 | } | |
1300 | ||
1301 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1302 | { | |
1303 | struct sock *sk = sock->sk; | |
1304 | struct iucv_sock *iucv = iucv_sk(sk); | |
1305 | struct iucv_message txmsg; | |
1306 | int err = 0; | |
eac3731b JH |
1307 | |
1308 | how++; | |
1309 | ||
1310 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1311 | return -EINVAL; | |
1312 | ||
1313 | lock_sock(sk); | |
da99f056 | 1314 | switch (sk->sk_state) { |
e14ad5fa HB |
1315 | case IUCV_DISCONN: |
1316 | case IUCV_CLOSING: | |
1317 | case IUCV_SEVERED: | |
eac3731b JH |
1318 | case IUCV_CLOSED: |
1319 | err = -ENOTCONN; | |
1320 | goto fail; | |
1321 | ||
1322 | default: | |
1323 | sk->sk_shutdown |= how; | |
1324 | break; | |
1325 | } | |
1326 | ||
1327 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1328 | txmsg.class = 0; | |
1329 | txmsg.tag = 0; | |
1330 | err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, | |
b8942e3b | 1331 | (void *) iprm_shutdown, 8); |
eac3731b | 1332 | if (err) { |
da99f056 | 1333 | switch (err) { |
eac3731b JH |
1334 | case 1: |
1335 | err = -ENOTCONN; | |
1336 | break; | |
1337 | case 2: | |
1338 | err = -ECONNRESET; | |
1339 | break; | |
1340 | default: | |
1341 | err = -ENOTCONN; | |
1342 | break; | |
1343 | } | |
1344 | } | |
1345 | } | |
1346 | ||
1347 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1348 | err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); | |
1349 | if (err) | |
1350 | err = -ENOTCONN; | |
1351 | ||
1352 | skb_queue_purge(&sk->sk_receive_queue); | |
1353 | } | |
1354 | ||
1355 | /* Wake up anyone sleeping in poll */ | |
1356 | sk->sk_state_change(sk); | |
1357 | ||
1358 | fail: | |
1359 | release_sock(sk); | |
1360 | return err; | |
1361 | } | |
1362 | ||
1363 | static int iucv_sock_release(struct socket *sock) | |
1364 | { | |
1365 | struct sock *sk = sock->sk; | |
1366 | int err = 0; | |
1367 | ||
1368 | if (!sk) | |
1369 | return 0; | |
1370 | ||
1371 | iucv_sock_close(sk); | |
1372 | ||
1373 | /* Unregister with IUCV base support */ | |
1374 | if (iucv_sk(sk)->path) { | |
1375 | iucv_path_sever(iucv_sk(sk)->path, NULL); | |
1376 | iucv_path_free(iucv_sk(sk)->path); | |
1377 | iucv_sk(sk)->path = NULL; | |
1378 | } | |
1379 | ||
eac3731b JH |
1380 | sock_orphan(sk); |
1381 | iucv_sock_kill(sk); | |
1382 | return err; | |
1383 | } | |
1384 | ||
9d5c5d8f HB |
1385 | /* getsockopt and setsockopt */ |
1386 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1387 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1388 | { |
1389 | struct sock *sk = sock->sk; | |
1390 | struct iucv_sock *iucv = iucv_sk(sk); | |
1391 | int val; | |
1392 | int rc; | |
1393 | ||
1394 | if (level != SOL_IUCV) | |
1395 | return -ENOPROTOOPT; | |
1396 | ||
1397 | if (optlen < sizeof(int)) | |
1398 | return -EINVAL; | |
1399 | ||
1400 | if (get_user(val, (int __user *) optval)) | |
1401 | return -EFAULT; | |
1402 | ||
1403 | rc = 0; | |
1404 | ||
1405 | lock_sock(sk); | |
1406 | switch (optname) { | |
1407 | case SO_IPRMDATA_MSG: | |
1408 | if (val) | |
1409 | iucv->flags |= IUCV_IPRMDATA; | |
1410 | else | |
1411 | iucv->flags &= ~IUCV_IPRMDATA; | |
1412 | break; | |
09488e2e HB |
1413 | case SO_MSGLIMIT: |
1414 | switch (sk->sk_state) { | |
1415 | case IUCV_OPEN: | |
1416 | case IUCV_BOUND: | |
1417 | if (val < 1 || val > (u16)(~0)) | |
1418 | rc = -EINVAL; | |
1419 | else | |
1420 | iucv->msglimit = val; | |
1421 | break; | |
1422 | default: | |
1423 | rc = -EINVAL; | |
1424 | break; | |
1425 | } | |
1426 | break; | |
9d5c5d8f HB |
1427 | default: |
1428 | rc = -ENOPROTOOPT; | |
1429 | break; | |
1430 | } | |
1431 | release_sock(sk); | |
1432 | ||
1433 | return rc; | |
1434 | } | |
1435 | ||
1436 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1437 | char __user *optval, int __user *optlen) | |
1438 | { | |
1439 | struct sock *sk = sock->sk; | |
1440 | struct iucv_sock *iucv = iucv_sk(sk); | |
1441 | int val, len; | |
1442 | ||
1443 | if (level != SOL_IUCV) | |
1444 | return -ENOPROTOOPT; | |
1445 | ||
1446 | if (get_user(len, optlen)) | |
1447 | return -EFAULT; | |
1448 | ||
1449 | if (len < 0) | |
1450 | return -EINVAL; | |
1451 | ||
1452 | len = min_t(unsigned int, len, sizeof(int)); | |
1453 | ||
1454 | switch (optname) { | |
1455 | case SO_IPRMDATA_MSG: | |
1456 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1457 | break; | |
09488e2e HB |
1458 | case SO_MSGLIMIT: |
1459 | lock_sock(sk); | |
1460 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1461 | : iucv->msglimit; /* default */ | |
1462 | release_sock(sk); | |
1463 | break; | |
9d5c5d8f HB |
1464 | default: |
1465 | return -ENOPROTOOPT; | |
1466 | } | |
1467 | ||
1468 | if (put_user(len, optlen)) | |
1469 | return -EFAULT; | |
1470 | if (copy_to_user(optval, &val, len)) | |
1471 | return -EFAULT; | |
1472 | ||
1473 | return 0; | |
1474 | } | |
1475 | ||
1476 | ||
eac3731b JH |
1477 | /* Callback wrappers - called from iucv base support */ |
1478 | static int iucv_callback_connreq(struct iucv_path *path, | |
1479 | u8 ipvmid[8], u8 ipuser[16]) | |
1480 | { | |
1481 | unsigned char user_data[16]; | |
1482 | unsigned char nuser_data[16]; | |
1483 | unsigned char src_name[8]; | |
1484 | struct hlist_node *node; | |
1485 | struct sock *sk, *nsk; | |
1486 | struct iucv_sock *iucv, *niucv; | |
1487 | int err; | |
1488 | ||
1489 | memcpy(src_name, ipuser, 8); | |
1490 | EBCASC(src_name, 8); | |
1491 | /* Find out if this path belongs to af_iucv. */ | |
1492 | read_lock(&iucv_sk_list.lock); | |
1493 | iucv = NULL; | |
febca281 | 1494 | sk = NULL; |
eac3731b JH |
1495 | sk_for_each(sk, node, &iucv_sk_list.head) |
1496 | if (sk->sk_state == IUCV_LISTEN && | |
1497 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1498 | /* | |
1499 | * Found a listening socket with | |
1500 | * src_name == ipuser[0-7]. | |
1501 | */ | |
1502 | iucv = iucv_sk(sk); | |
1503 | break; | |
1504 | } | |
1505 | read_unlock(&iucv_sk_list.lock); | |
1506 | if (!iucv) | |
1507 | /* No socket found, not one of our paths. */ | |
1508 | return -EINVAL; | |
1509 | ||
1510 | bh_lock_sock(sk); | |
1511 | ||
1512 | /* Check if parent socket is listening */ | |
1513 | low_nmcpy(user_data, iucv->src_name); | |
1514 | high_nmcpy(user_data, iucv->dst_name); | |
1515 | ASCEBC(user_data, sizeof(user_data)); | |
1516 | if (sk->sk_state != IUCV_LISTEN) { | |
1517 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1518 | iucv_path_free(path); |
eac3731b JH |
1519 | goto fail; |
1520 | } | |
1521 | ||
1522 | /* Check for backlog size */ | |
1523 | if (sk_acceptq_is_full(sk)) { | |
1524 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1525 | iucv_path_free(path); |
eac3731b JH |
1526 | goto fail; |
1527 | } | |
1528 | ||
1529 | /* Create the new socket */ | |
aa8e71f5 | 1530 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
da99f056 | 1531 | if (!nsk) { |
eac3731b | 1532 | err = iucv_path_sever(path, user_data); |
65dbd7c2 | 1533 | iucv_path_free(path); |
eac3731b JH |
1534 | goto fail; |
1535 | } | |
1536 | ||
1537 | niucv = iucv_sk(nsk); | |
1538 | iucv_sock_init(nsk, sk); | |
1539 | ||
1540 | /* Set the new iucv_sock */ | |
1541 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1542 | EBCASC(niucv->dst_name, 8); | |
1543 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1544 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1545 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1546 | niucv->path = path; | |
1547 | ||
1548 | /* Call iucv_accept */ | |
1549 | high_nmcpy(nuser_data, ipuser + 8); | |
1550 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1551 | ASCEBC(nuser_data + 8, 8); | |
1552 | ||
09488e2e HB |
1553 | /* set message limit for path based on msglimit of accepting socket */ |
1554 | niucv->msglimit = iucv->msglimit; | |
1555 | path->msglim = iucv->msglimit; | |
eac3731b | 1556 | err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1557 | if (err) { |
eac3731b | 1558 | err = iucv_path_sever(path, user_data); |
65dbd7c2 HB |
1559 | iucv_path_free(path); |
1560 | iucv_sock_kill(nsk); | |
eac3731b JH |
1561 | goto fail; |
1562 | } | |
1563 | ||
1564 | iucv_accept_enqueue(sk, nsk); | |
1565 | ||
1566 | /* Wake up accept */ | |
1567 | nsk->sk_state = IUCV_CONNECTED; | |
1568 | sk->sk_data_ready(sk, 1); | |
1569 | err = 0; | |
1570 | fail: | |
1571 | bh_unlock_sock(sk); | |
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1576 | { | |
1577 | struct sock *sk = path->private; | |
1578 | ||
1579 | sk->sk_state = IUCV_CONNECTED; | |
1580 | sk->sk_state_change(sk); | |
1581 | } | |
1582 | ||
1583 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1584 | { | |
1585 | struct sock *sk = path->private; | |
561e0360 | 1586 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1587 | struct sk_buff *skb; |
1588 | struct sock_msg_q *save_msg; | |
1589 | int len; | |
561e0360 | 1590 | |
fe86e54e HB |
1591 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
1592 | iucv_message_reject(path, msg); | |
eac3731b | 1593 | return; |
fe86e54e | 1594 | } |
eac3731b | 1595 | |
3fa6b5ad | 1596 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1597 | |
f0703c80 UB |
1598 | if (!list_empty(&iucv->message_q.list) || |
1599 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1600 | goto save_message; | |
1601 | ||
1602 | len = atomic_read(&sk->sk_rmem_alloc); | |
b8942e3b | 1603 | len += iucv_msg_length(msg) + sizeof(struct sk_buff); |
f0703c80 UB |
1604 | if (len > sk->sk_rcvbuf) |
1605 | goto save_message; | |
1606 | ||
b8942e3b | 1607 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1608 | if (!skb) |
1609 | goto save_message; | |
eac3731b | 1610 | |
f0703c80 | 1611 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1612 | goto out_unlock; |
eac3731b | 1613 | |
f0703c80 UB |
1614 | save_message: |
1615 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1616 | if (!save_msg) |
a56635a5 | 1617 | goto out_unlock; |
f0703c80 UB |
1618 | save_msg->path = path; |
1619 | save_msg->msg = *msg; | |
eac3731b | 1620 | |
f0703c80 | 1621 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1622 | |
1623 | out_unlock: | |
f0703c80 | 1624 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1625 | } |
1626 | ||
1627 | static void iucv_callback_txdone(struct iucv_path *path, | |
1628 | struct iucv_message *msg) | |
1629 | { | |
1630 | struct sock *sk = path->private; | |
f2a77991 | 1631 | struct sk_buff *this = NULL; |
eac3731b JH |
1632 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1633 | struct sk_buff *list_skb = list->next; | |
1634 | unsigned long flags; | |
1635 | ||
f2a77991 | 1636 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1637 | spin_lock_irqsave(&list->lock, flags); |
1638 | ||
f2a77991 | 1639 | while (list_skb != (struct sk_buff *)list) { |
44b1e6b5 | 1640 | if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { |
f2a77991 UB |
1641 | this = list_skb; |
1642 | break; | |
1643 | } | |
561e0360 | 1644 | list_skb = list_skb->next; |
f2a77991 UB |
1645 | } |
1646 | if (this) | |
1647 | __skb_unlink(this, list); | |
561e0360 JH |
1648 | |
1649 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1650 | |
0ea920d2 HB |
1651 | if (this) { |
1652 | kfree_skb(this); | |
1653 | /* wake up any process waiting for sending */ | |
1654 | iucv_sock_wake_msglim(sk); | |
1655 | } | |
561e0360 | 1656 | } |
c2b4afd2 | 1657 | BUG_ON(!this); |
eac3731b | 1658 | |
da99f056 | 1659 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1660 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1661 | sk->sk_state = IUCV_CLOSED; | |
1662 | sk->sk_state_change(sk); | |
1663 | } | |
1664 | } | |
eac3731b | 1665 | |
eac3731b JH |
1666 | } |
1667 | ||
1668 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1669 | { | |
1670 | struct sock *sk = path->private; | |
1671 | ||
1672 | if (!list_empty(&iucv_sk(sk)->accept_q)) | |
1673 | sk->sk_state = IUCV_SEVERED; | |
1674 | else | |
1675 | sk->sk_state = IUCV_DISCONN; | |
1676 | ||
1677 | sk->sk_state_change(sk); | |
1678 | } | |
1679 | ||
af88b52d HB |
1680 | /* called if the other communication side shuts down its RECV direction; |
1681 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1682 | */ | |
1683 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1684 | { | |
1685 | struct sock *sk = path->private; | |
1686 | ||
1687 | bh_lock_sock(sk); | |
1688 | if (sk->sk_state != IUCV_CLOSED) { | |
1689 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1690 | sk->sk_state_change(sk); | |
1691 | } | |
1692 | bh_unlock_sock(sk); | |
1693 | } | |
1694 | ||
5708e868 | 1695 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
1696 | .family = PF_IUCV, |
1697 | .owner = THIS_MODULE, | |
1698 | .release = iucv_sock_release, | |
1699 | .bind = iucv_sock_bind, | |
1700 | .connect = iucv_sock_connect, | |
1701 | .listen = iucv_sock_listen, | |
1702 | .accept = iucv_sock_accept, | |
1703 | .getname = iucv_sock_getname, | |
1704 | .sendmsg = iucv_sock_sendmsg, | |
1705 | .recvmsg = iucv_sock_recvmsg, | |
1706 | .poll = iucv_sock_poll, | |
1707 | .ioctl = sock_no_ioctl, | |
1708 | .mmap = sock_no_mmap, | |
1709 | .socketpair = sock_no_socketpair, | |
1710 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
1711 | .setsockopt = iucv_sock_setsockopt, |
1712 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
1713 | }; |
1714 | ||
ec1b4cf7 | 1715 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
1716 | .family = AF_IUCV, |
1717 | .owner = THIS_MODULE, | |
1718 | .create = iucv_sock_create, | |
1719 | }; | |
1720 | ||
da99f056 | 1721 | static int __init afiucv_init(void) |
eac3731b JH |
1722 | { |
1723 | int err; | |
1724 | ||
1725 | if (!MACHINE_IS_VM) { | |
8f7c502c UB |
1726 | pr_err("The af_iucv module cannot be loaded" |
1727 | " without z/VM\n"); | |
eac3731b JH |
1728 | err = -EPROTONOSUPPORT; |
1729 | goto out; | |
1730 | } | |
1731 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
1732 | if (unlikely(err)) { | |
c2b4afd2 | 1733 | WARN_ON(err); |
eac3731b JH |
1734 | err = -EPROTONOSUPPORT; |
1735 | goto out; | |
1736 | } | |
1737 | ||
1738 | err = iucv_register(&af_iucv_handler, 0); | |
1739 | if (err) | |
1740 | goto out; | |
1741 | err = proto_register(&iucv_proto, 0); | |
1742 | if (err) | |
1743 | goto out_iucv; | |
1744 | err = sock_register(&iucv_sock_family_ops); | |
1745 | if (err) | |
1746 | goto out_proto; | |
c23cad92 UB |
1747 | /* establish dummy device */ |
1748 | err = driver_register(&af_iucv_driver); | |
1749 | if (err) | |
1750 | goto out_sock; | |
1751 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
1752 | if (!af_iucv_dev) { | |
1753 | err = -ENOMEM; | |
1754 | goto out_driver; | |
1755 | } | |
1756 | dev_set_name(af_iucv_dev, "af_iucv"); | |
1757 | af_iucv_dev->bus = &iucv_bus; | |
1758 | af_iucv_dev->parent = iucv_root; | |
1759 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
1760 | af_iucv_dev->driver = &af_iucv_driver; | |
1761 | err = device_register(af_iucv_dev); | |
1762 | if (err) | |
1763 | goto out_driver; | |
1764 | ||
eac3731b JH |
1765 | return 0; |
1766 | ||
c23cad92 UB |
1767 | out_driver: |
1768 | driver_unregister(&af_iucv_driver); | |
1769 | out_sock: | |
1770 | sock_unregister(PF_IUCV); | |
eac3731b JH |
1771 | out_proto: |
1772 | proto_unregister(&iucv_proto); | |
1773 | out_iucv: | |
1774 | iucv_unregister(&af_iucv_handler, 0); | |
1775 | out: | |
1776 | return err; | |
1777 | } | |
1778 | ||
1779 | static void __exit afiucv_exit(void) | |
1780 | { | |
c23cad92 UB |
1781 | device_unregister(af_iucv_dev); |
1782 | driver_unregister(&af_iucv_driver); | |
eac3731b JH |
1783 | sock_unregister(PF_IUCV); |
1784 | proto_unregister(&iucv_proto); | |
1785 | iucv_unregister(&af_iucv_handler, 0); | |
eac3731b JH |
1786 | } |
1787 | ||
1788 | module_init(afiucv_init); | |
1789 | module_exit(afiucv_exit); | |
1790 | ||
1791 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
1792 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
1793 | MODULE_VERSION(VERSION); | |
1794 | MODULE_LICENSE("GPL"); | |
1795 | MODULE_ALIAS_NETPROTO(PF_IUCV); |