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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 | ||
eac3731b JH |
30 | #include <net/iucv/af_iucv.h> |
31 | ||
3881ac44 | 32 | #define VERSION "1.2" |
eac3731b JH |
33 | |
34 | static char iucv_userid[80]; | |
35 | ||
5708e868 | 36 | static const struct proto_ops iucv_sock_ops; |
eac3731b JH |
37 | |
38 | static struct proto iucv_proto = { | |
39 | .name = "AF_IUCV", | |
40 | .owner = THIS_MODULE, | |
41 | .obj_size = sizeof(struct iucv_sock), | |
42 | }; | |
43 | ||
6fcd61f7 FB |
44 | static struct iucv_interface *pr_iucv; |
45 | ||
b8942e3b HB |
46 | /* special AF_IUCV IPRM messages */ |
47 | static const u8 iprm_shutdown[8] = | |
48 | {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; | |
49 | ||
44b1e6b5 HB |
50 | #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) |
51 | ||
0ea920d2 HB |
52 | #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
53 | do { \ | |
54 | DEFINE_WAIT(__wait); \ | |
55 | long __timeo = timeo; \ | |
56 | ret = 0; \ | |
aa395145 | 57 | prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
0ea920d2 | 58 | while (!(condition)) { \ |
0ea920d2 HB |
59 | if (!__timeo) { \ |
60 | ret = -EAGAIN; \ | |
61 | break; \ | |
62 | } \ | |
63 | if (signal_pending(current)) { \ | |
64 | ret = sock_intr_errno(__timeo); \ | |
65 | break; \ | |
66 | } \ | |
67 | release_sock(sk); \ | |
68 | __timeo = schedule_timeout(__timeo); \ | |
69 | lock_sock(sk); \ | |
70 | ret = sock_error(sk); \ | |
71 | if (ret) \ | |
72 | break; \ | |
73 | } \ | |
aa395145 | 74 | finish_wait(sk_sleep(sk), &__wait); \ |
0ea920d2 HB |
75 | } while (0) |
76 | ||
77 | #define iucv_sock_wait(sk, condition, timeo) \ | |
78 | ({ \ | |
79 | int __ret = 0; \ | |
80 | if (!(condition)) \ | |
81 | __iucv_sock_wait(sk, condition, timeo, __ret); \ | |
82 | __ret; \ | |
83 | }) | |
44b1e6b5 | 84 | |
57f20448 HC |
85 | static void iucv_sock_kill(struct sock *sk); |
86 | static void iucv_sock_close(struct sock *sk); | |
7d316b94 | 87 | static void iucv_sever_path(struct sock *, int); |
57f20448 | 88 | |
3881ac44 UB |
89 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, |
90 | struct packet_type *pt, struct net_device *orig_dev); | |
91 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
92 | struct sk_buff *skb, u8 flags); | |
93 | static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); | |
94 | ||
eac3731b JH |
95 | /* Call Back functions */ |
96 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
97 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
98 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
99 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
100 | u8 ipuser[16]); | |
eac3731b | 101 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 102 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
103 | |
104 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 105 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
106 | .autobind_name = ATOMIC_INIT(0) |
107 | }; | |
108 | ||
109 | static struct iucv_handler af_iucv_handler = { | |
110 | .path_pending = iucv_callback_connreq, | |
111 | .path_complete = iucv_callback_connack, | |
112 | .path_severed = iucv_callback_connrej, | |
113 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
114 | .message_complete = iucv_callback_txdone, |
115 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
116 | }; |
117 | ||
118 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
119 | { | |
120 | memcpy(dst, src, 8); | |
121 | } | |
122 | ||
123 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
124 | { | |
125 | memcpy(&dst[8], src, 8); | |
126 | } | |
127 | ||
c23cad92 UB |
128 | static int afiucv_pm_prepare(struct device *dev) |
129 | { | |
130 | #ifdef CONFIG_PM_DEBUG | |
131 | printk(KERN_WARNING "afiucv_pm_prepare\n"); | |
132 | #endif | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static void afiucv_pm_complete(struct device *dev) | |
137 | { | |
138 | #ifdef CONFIG_PM_DEBUG | |
139 | printk(KERN_WARNING "afiucv_pm_complete\n"); | |
140 | #endif | |
c23cad92 UB |
141 | } |
142 | ||
143 | /** | |
144 | * afiucv_pm_freeze() - Freeze PM callback | |
145 | * @dev: AFIUCV dummy device | |
146 | * | |
147 | * Sever all established IUCV communication pathes | |
148 | */ | |
149 | static int afiucv_pm_freeze(struct device *dev) | |
150 | { | |
151 | struct iucv_sock *iucv; | |
152 | struct sock *sk; | |
c23cad92 UB |
153 | int err = 0; |
154 | ||
155 | #ifdef CONFIG_PM_DEBUG | |
156 | printk(KERN_WARNING "afiucv_pm_freeze\n"); | |
157 | #endif | |
158 | read_lock(&iucv_sk_list.lock); | |
b67bfe0d | 159 | sk_for_each(sk, &iucv_sk_list.head) { |
c23cad92 | 160 | iucv = iucv_sk(sk); |
c23cad92 | 161 | switch (sk->sk_state) { |
c23cad92 UB |
162 | case IUCV_DISCONN: |
163 | case IUCV_CLOSING: | |
164 | case IUCV_CONNECTED: | |
7d316b94 | 165 | iucv_sever_path(sk, 0); |
c23cad92 UB |
166 | break; |
167 | case IUCV_OPEN: | |
168 | case IUCV_BOUND: | |
169 | case IUCV_LISTEN: | |
170 | case IUCV_CLOSED: | |
171 | default: | |
172 | break; | |
173 | } | |
7d316b94 UB |
174 | skb_queue_purge(&iucv->send_skb_q); |
175 | skb_queue_purge(&iucv->backlog_skb_q); | |
c23cad92 UB |
176 | } |
177 | read_unlock(&iucv_sk_list.lock); | |
178 | return err; | |
179 | } | |
180 | ||
181 | /** | |
182 | * afiucv_pm_restore_thaw() - Thaw and restore PM callback | |
183 | * @dev: AFIUCV dummy device | |
184 | * | |
185 | * socket clean up after freeze | |
186 | */ | |
187 | static int afiucv_pm_restore_thaw(struct device *dev) | |
188 | { | |
c23cad92 | 189 | struct sock *sk; |
c23cad92 UB |
190 | |
191 | #ifdef CONFIG_PM_DEBUG | |
192 | printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); | |
193 | #endif | |
194 | read_lock(&iucv_sk_list.lock); | |
b67bfe0d | 195 | sk_for_each(sk, &iucv_sk_list.head) { |
c23cad92 UB |
196 | switch (sk->sk_state) { |
197 | case IUCV_CONNECTED: | |
198 | sk->sk_err = EPIPE; | |
199 | sk->sk_state = IUCV_DISCONN; | |
200 | sk->sk_state_change(sk); | |
201 | break; | |
202 | case IUCV_DISCONN: | |
c23cad92 UB |
203 | case IUCV_CLOSING: |
204 | case IUCV_LISTEN: | |
205 | case IUCV_BOUND: | |
206 | case IUCV_OPEN: | |
207 | default: | |
208 | break; | |
209 | } | |
210 | } | |
211 | read_unlock(&iucv_sk_list.lock); | |
212 | return 0; | |
213 | } | |
214 | ||
47145210 | 215 | static const struct dev_pm_ops afiucv_pm_ops = { |
c23cad92 UB |
216 | .prepare = afiucv_pm_prepare, |
217 | .complete = afiucv_pm_complete, | |
218 | .freeze = afiucv_pm_freeze, | |
219 | .thaw = afiucv_pm_restore_thaw, | |
220 | .restore = afiucv_pm_restore_thaw, | |
221 | }; | |
222 | ||
223 | static struct device_driver af_iucv_driver = { | |
224 | .owner = THIS_MODULE, | |
225 | .name = "afiucv", | |
6fcd61f7 | 226 | .bus = NULL, |
c23cad92 UB |
227 | .pm = &afiucv_pm_ops, |
228 | }; | |
229 | ||
230 | /* dummy device used as trigger for PM functions */ | |
231 | static struct device *af_iucv_dev; | |
232 | ||
b8942e3b HB |
233 | /** |
234 | * iucv_msg_length() - Returns the length of an iucv message. | |
235 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
236 | * | |
237 | * The function returns the length of the specified iucv message @msg of data | |
238 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
239 | * | |
240 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
241 | * data: | |
242 | * PRMDATA[0..6] socket data (max 7 bytes); | |
243 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
244 | * | |
25985edc | 245 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
246 | * value from 0xFF. |
247 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
248 | * notifications (see iucv_sock_shutdown); and further, | |
249 | * if the socket data len is > 7, the function returns 8. | |
250 | * | |
251 | * Use this function to allocate socket buffers to store iucv message data. | |
252 | */ | |
253 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
254 | { | |
255 | size_t datalen; | |
256 | ||
257 | if (msg->flags & IUCV_IPRMDATA) { | |
258 | datalen = 0xff - msg->rmmsg[7]; | |
259 | return (datalen < 8) ? datalen : 8; | |
260 | } | |
261 | return msg->length; | |
262 | } | |
263 | ||
0ea920d2 HB |
264 | /** |
265 | * iucv_sock_in_state() - check for specific states | |
266 | * @sk: sock structure | |
267 | * @state: first iucv sk state | |
268 | * @state: second iucv sk state | |
269 | * | |
270 | * Returns true if the socket in either in the first or second state. | |
271 | */ | |
272 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
273 | { | |
274 | return (sk->sk_state == state || sk->sk_state == state2); | |
275 | } | |
276 | ||
277 | /** | |
278 | * iucv_below_msglim() - function to check if messages can be sent | |
279 | * @sk: sock structure | |
280 | * | |
281 | * Returns true if the send queue length is lower than the message limit. | |
282 | * Always returns true if the socket is not connected (no iucv path for | |
283 | * checking the message limit). | |
284 | */ | |
285 | static inline int iucv_below_msglim(struct sock *sk) | |
286 | { | |
287 | struct iucv_sock *iucv = iucv_sk(sk); | |
288 | ||
289 | if (sk->sk_state != IUCV_CONNECTED) | |
290 | return 1; | |
3881ac44 UB |
291 | if (iucv->transport == AF_IUCV_TRANS_IUCV) |
292 | return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); | |
293 | else | |
294 | return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && | |
295 | (atomic_read(&iucv->pendings) <= 0)); | |
0ea920d2 HB |
296 | } |
297 | ||
298 | /** | |
299 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
300 | */ | |
301 | static void iucv_sock_wake_msglim(struct sock *sk) | |
302 | { | |
43815482 ED |
303 | struct socket_wq *wq; |
304 | ||
305 | rcu_read_lock(); | |
306 | wq = rcu_dereference(sk->sk_wq); | |
307 | if (wq_has_sleeper(wq)) | |
308 | wake_up_interruptible_all(&wq->wait); | |
0ea920d2 | 309 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 310 | rcu_read_unlock(); |
0ea920d2 HB |
311 | } |
312 | ||
3881ac44 UB |
313 | /** |
314 | * afiucv_hs_send() - send a message through HiperSockets transport | |
315 | */ | |
316 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
317 | struct sk_buff *skb, u8 flags) | |
318 | { | |
3881ac44 UB |
319 | struct iucv_sock *iucv = iucv_sk(sock); |
320 | struct af_iucv_trans_hdr *phs_hdr; | |
321 | struct sk_buff *nskb; | |
322 | int err, confirm_recv = 0; | |
323 | ||
324 | memset(skb->head, 0, ETH_HLEN); | |
325 | phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, | |
326 | sizeof(struct af_iucv_trans_hdr)); | |
327 | skb_reset_mac_header(skb); | |
328 | skb_reset_network_header(skb); | |
329 | skb_push(skb, ETH_HLEN); | |
330 | skb_reset_mac_header(skb); | |
331 | memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); | |
332 | ||
333 | phs_hdr->magic = ETH_P_AF_IUCV; | |
334 | phs_hdr->version = 1; | |
335 | phs_hdr->flags = flags; | |
336 | if (flags == AF_IUCV_FLAG_SYN) | |
337 | phs_hdr->window = iucv->msglimit; | |
338 | else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { | |
339 | confirm_recv = atomic_read(&iucv->msg_recv); | |
340 | phs_hdr->window = confirm_recv; | |
341 | if (confirm_recv) | |
342 | phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; | |
343 | } | |
344 | memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); | |
345 | memcpy(phs_hdr->destAppName, iucv->dst_name, 8); | |
346 | memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); | |
347 | memcpy(phs_hdr->srcAppName, iucv->src_name, 8); | |
348 | ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); | |
349 | ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); | |
350 | ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); | |
351 | ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); | |
352 | if (imsg) | |
353 | memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); | |
354 | ||
800c5eb7 | 355 | skb->dev = iucv->hs_dev; |
3881ac44 UB |
356 | if (!skb->dev) |
357 | return -ENODEV; | |
800c5eb7 | 358 | if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) |
3881ac44 UB |
359 | return -ENETDOWN; |
360 | if (skb->len > skb->dev->mtu) { | |
361 | if (sock->sk_type == SOCK_SEQPACKET) | |
362 | return -EMSGSIZE; | |
363 | else | |
364 | skb_trim(skb, skb->dev->mtu); | |
365 | } | |
366 | skb->protocol = ETH_P_AF_IUCV; | |
3881ac44 UB |
367 | nskb = skb_clone(skb, GFP_ATOMIC); |
368 | if (!nskb) | |
369 | return -ENOMEM; | |
370 | skb_queue_tail(&iucv->send_skb_q, nskb); | |
371 | err = dev_queue_xmit(skb); | |
800c5eb7 | 372 | if (net_xmit_eval(err)) { |
3881ac44 UB |
373 | skb_unlink(nskb, &iucv->send_skb_q); |
374 | kfree_skb(nskb); | |
375 | } else { | |
376 | atomic_sub(confirm_recv, &iucv->msg_recv); | |
377 | WARN_ON(atomic_read(&iucv->msg_recv) < 0); | |
378 | } | |
800c5eb7 | 379 | return net_xmit_eval(err); |
3881ac44 UB |
380 | } |
381 | ||
eac3731b JH |
382 | static struct sock *__iucv_get_sock_by_name(char *nm) |
383 | { | |
384 | struct sock *sk; | |
eac3731b | 385 | |
b67bfe0d | 386 | sk_for_each(sk, &iucv_sk_list.head) |
eac3731b JH |
387 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) |
388 | return sk; | |
389 | ||
390 | return NULL; | |
391 | } | |
392 | ||
393 | static void iucv_sock_destruct(struct sock *sk) | |
394 | { | |
395 | skb_queue_purge(&sk->sk_receive_queue); | |
82492a35 UB |
396 | skb_queue_purge(&sk->sk_error_queue); |
397 | ||
398 | sk_mem_reclaim(sk); | |
399 | ||
400 | if (!sock_flag(sk, SOCK_DEAD)) { | |
401 | pr_err("Attempt to release alive iucv socket %p\n", sk); | |
402 | return; | |
403 | } | |
404 | ||
405 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); | |
406 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
407 | WARN_ON(sk->sk_wmem_queued); | |
408 | WARN_ON(sk->sk_forward_alloc); | |
eac3731b JH |
409 | } |
410 | ||
411 | /* Cleanup Listen */ | |
412 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
413 | { | |
414 | struct sock *sk; | |
415 | ||
416 | /* Close non-accepted connections */ | |
417 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
418 | iucv_sock_close(sk); | |
419 | iucv_sock_kill(sk); | |
420 | } | |
421 | ||
422 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
423 | } |
424 | ||
7514bab0 | 425 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
426 | static void iucv_sock_kill(struct sock *sk) |
427 | { | |
428 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
429 | return; | |
430 | ||
431 | iucv_sock_unlink(&iucv_sk_list, sk); | |
432 | sock_set_flag(sk, SOCK_DEAD); | |
433 | sock_put(sk); | |
434 | } | |
435 | ||
7d316b94 UB |
436 | /* Terminate an IUCV path */ |
437 | static void iucv_sever_path(struct sock *sk, int with_user_data) | |
438 | { | |
439 | unsigned char user_data[16]; | |
440 | struct iucv_sock *iucv = iucv_sk(sk); | |
441 | struct iucv_path *path = iucv->path; | |
442 | ||
443 | if (iucv->path) { | |
444 | iucv->path = NULL; | |
445 | if (with_user_data) { | |
446 | low_nmcpy(user_data, iucv->src_name); | |
447 | high_nmcpy(user_data, iucv->dst_name); | |
448 | ASCEBC(user_data, sizeof(user_data)); | |
449 | pr_iucv->path_sever(path, user_data); | |
450 | } else | |
451 | pr_iucv->path_sever(path, NULL); | |
452 | iucv_path_free(path); | |
453 | } | |
454 | } | |
455 | ||
9fbd87d4 UB |
456 | /* Send FIN through an IUCV socket for HIPER transport */ |
457 | static int iucv_send_ctrl(struct sock *sk, u8 flags) | |
458 | { | |
459 | int err = 0; | |
460 | int blen; | |
461 | struct sk_buff *skb; | |
462 | ||
463 | blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
464 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
465 | if (skb) { | |
466 | skb_reserve(skb, blen); | |
467 | err = afiucv_hs_send(NULL, sk, skb, flags); | |
468 | } | |
469 | return err; | |
470 | } | |
471 | ||
eac3731b JH |
472 | /* Close an IUCV socket */ |
473 | static void iucv_sock_close(struct sock *sk) | |
474 | { | |
eac3731b | 475 | struct iucv_sock *iucv = iucv_sk(sk); |
561e0360 | 476 | unsigned long timeo; |
800c5eb7 | 477 | int err = 0; |
eac3731b | 478 | |
eac3731b JH |
479 | lock_sock(sk); |
480 | ||
da99f056 | 481 | switch (sk->sk_state) { |
eac3731b JH |
482 | case IUCV_LISTEN: |
483 | iucv_sock_cleanup_listen(sk); | |
484 | break; | |
485 | ||
486 | case IUCV_CONNECTED: | |
3881ac44 | 487 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
9fbd87d4 | 488 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); |
3881ac44 UB |
489 | sk->sk_state = IUCV_DISCONN; |
490 | sk->sk_state_change(sk); | |
491 | } | |
816abbad | 492 | case IUCV_DISCONN: /* fall through */ |
561e0360 JH |
493 | sk->sk_state = IUCV_CLOSING; |
494 | sk->sk_state_change(sk); | |
495 | ||
800c5eb7 | 496 | if (!err && !skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
497 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
498 | timeo = sk->sk_lingertime; | |
499 | else | |
500 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 501 | iucv_sock_wait(sk, |
0ea920d2 HB |
502 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
503 | timeo); | |
561e0360 JH |
504 | } |
505 | ||
bbe188c8 | 506 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
507 | sk->sk_state = IUCV_CLOSED; |
508 | sk->sk_state_change(sk); | |
509 | ||
eac3731b JH |
510 | sk->sk_err = ECONNRESET; |
511 | sk->sk_state_change(sk); | |
512 | ||
800c5eb7 | 513 | skb_queue_purge(&iucv->send_skb_q); |
561e0360 | 514 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b | 515 | |
7d316b94 UB |
516 | default: /* fall through */ |
517 | iucv_sever_path(sk, 1); | |
3ff50b79 | 518 | } |
eac3731b | 519 | |
800c5eb7 UB |
520 | if (iucv->hs_dev) { |
521 | dev_put(iucv->hs_dev); | |
522 | iucv->hs_dev = NULL; | |
523 | sk->sk_bound_dev_if = 0; | |
524 | } | |
525 | ||
7514bab0 HB |
526 | /* mark socket for deletion by iucv_sock_kill() */ |
527 | sock_set_flag(sk, SOCK_ZAPPED); | |
528 | ||
eac3731b | 529 | release_sock(sk); |
eac3731b JH |
530 | } |
531 | ||
532 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
533 | { | |
534 | if (parent) | |
535 | sk->sk_type = parent->sk_type; | |
536 | } | |
537 | ||
538 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
539 | { | |
540 | struct sock *sk; | |
493d3971 | 541 | struct iucv_sock *iucv; |
eac3731b | 542 | |
6257ff21 | 543 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
544 | if (!sk) |
545 | return NULL; | |
493d3971 | 546 | iucv = iucv_sk(sk); |
eac3731b JH |
547 | |
548 | sock_init_data(sock, sk); | |
493d3971 UB |
549 | INIT_LIST_HEAD(&iucv->accept_q); |
550 | spin_lock_init(&iucv->accept_q_lock); | |
551 | skb_queue_head_init(&iucv->send_skb_q); | |
552 | INIT_LIST_HEAD(&iucv->message_q.list); | |
553 | spin_lock_init(&iucv->message_q.lock); | |
554 | skb_queue_head_init(&iucv->backlog_skb_q); | |
555 | iucv->send_tag = 0; | |
3881ac44 | 556 | atomic_set(&iucv->pendings, 0); |
493d3971 | 557 | iucv->flags = 0; |
3881ac44 UB |
558 | iucv->msglimit = 0; |
559 | atomic_set(&iucv->msg_sent, 0); | |
560 | atomic_set(&iucv->msg_recv, 0); | |
493d3971 | 561 | iucv->path = NULL; |
3881ac44 | 562 | iucv->sk_txnotify = afiucv_hs_callback_txnotify; |
493d3971 | 563 | memset(&iucv->src_user_id , 0, 32); |
3881ac44 UB |
564 | if (pr_iucv) |
565 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
566 | else | |
567 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
eac3731b JH |
568 | |
569 | sk->sk_destruct = iucv_sock_destruct; | |
570 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
571 | sk->sk_allocation = GFP_DMA; | |
572 | ||
573 | sock_reset_flag(sk, SOCK_ZAPPED); | |
574 | ||
575 | sk->sk_protocol = proto; | |
576 | sk->sk_state = IUCV_OPEN; | |
577 | ||
eac3731b JH |
578 | iucv_sock_link(&iucv_sk_list, sk); |
579 | return sk; | |
580 | } | |
581 | ||
582 | /* Create an IUCV socket */ | |
3f378b68 EP |
583 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
584 | int kern) | |
eac3731b JH |
585 | { |
586 | struct sock *sk; | |
587 | ||
aa8e71f5 HB |
588 | if (protocol && protocol != PF_IUCV) |
589 | return -EPROTONOSUPPORT; | |
eac3731b JH |
590 | |
591 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
592 | |
593 | switch (sock->type) { | |
594 | case SOCK_STREAM: | |
595 | sock->ops = &iucv_sock_ops; | |
596 | break; | |
597 | case SOCK_SEQPACKET: | |
598 | /* currently, proto ops can handle both sk types */ | |
599 | sock->ops = &iucv_sock_ops; | |
600 | break; | |
601 | default: | |
602 | return -ESOCKTNOSUPPORT; | |
603 | } | |
eac3731b JH |
604 | |
605 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
606 | if (!sk) | |
607 | return -ENOMEM; | |
608 | ||
609 | iucv_sock_init(sk, NULL); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
615 | { | |
616 | write_lock_bh(&l->lock); | |
617 | sk_add_node(sk, &l->head); | |
618 | write_unlock_bh(&l->lock); | |
619 | } | |
620 | ||
621 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
622 | { | |
623 | write_lock_bh(&l->lock); | |
624 | sk_del_node_init(sk); | |
625 | write_unlock_bh(&l->lock); | |
626 | } | |
627 | ||
628 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
629 | { | |
febca281 UB |
630 | unsigned long flags; |
631 | struct iucv_sock *par = iucv_sk(parent); | |
632 | ||
eac3731b | 633 | sock_hold(sk); |
febca281 UB |
634 | spin_lock_irqsave(&par->accept_q_lock, flags); |
635 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
636 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 637 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 638 | sk_acceptq_added(parent); |
eac3731b JH |
639 | } |
640 | ||
641 | void iucv_accept_unlink(struct sock *sk) | |
642 | { | |
febca281 UB |
643 | unsigned long flags; |
644 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
645 | ||
646 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 647 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 648 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 649 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
650 | iucv_sk(sk)->parent = NULL; |
651 | sock_put(sk); | |
652 | } | |
653 | ||
654 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
655 | { | |
656 | struct iucv_sock *isk, *n; | |
657 | struct sock *sk; | |
658 | ||
da99f056 | 659 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
660 | sk = (struct sock *) isk; |
661 | lock_sock(sk); | |
662 | ||
663 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 664 | iucv_accept_unlink(sk); |
febca281 | 665 | release_sock(sk); |
eac3731b JH |
666 | continue; |
667 | } | |
668 | ||
669 | if (sk->sk_state == IUCV_CONNECTED || | |
aac6399c | 670 | sk->sk_state == IUCV_DISCONN || |
eac3731b JH |
671 | !newsock) { |
672 | iucv_accept_unlink(sk); | |
673 | if (newsock) | |
674 | sock_graft(sk, newsock); | |
675 | ||
eac3731b JH |
676 | release_sock(sk); |
677 | return sk; | |
678 | } | |
679 | ||
680 | release_sock(sk); | |
681 | } | |
682 | return NULL; | |
683 | } | |
684 | ||
53a4b499 PH |
685 | static void __iucv_auto_name(struct iucv_sock *iucv) |
686 | { | |
687 | char name[12]; | |
688 | ||
689 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
690 | while (__iucv_get_sock_by_name(name)) { | |
691 | sprintf(name, "%08x", | |
692 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
693 | } | |
694 | memcpy(iucv->src_name, name, 8); | |
695 | } | |
696 | ||
eac3731b JH |
697 | /* Bind an unbound socket */ |
698 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
699 | int addr_len) | |
700 | { | |
701 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
702 | struct sock *sk = sock->sk; | |
703 | struct iucv_sock *iucv; | |
3881ac44 UB |
704 | int err = 0; |
705 | struct net_device *dev; | |
706 | char uid[9]; | |
eac3731b JH |
707 | |
708 | /* Verify the input sockaddr */ | |
709 | if (!addr || addr->sa_family != AF_IUCV) | |
710 | return -EINVAL; | |
711 | ||
712 | lock_sock(sk); | |
713 | if (sk->sk_state != IUCV_OPEN) { | |
714 | err = -EBADFD; | |
715 | goto done; | |
716 | } | |
717 | ||
718 | write_lock_bh(&iucv_sk_list.lock); | |
719 | ||
720 | iucv = iucv_sk(sk); | |
721 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
722 | err = -EADDRINUSE; | |
723 | goto done_unlock; | |
724 | } | |
3881ac44 | 725 | if (iucv->path) |
eac3731b | 726 | goto done_unlock; |
eac3731b JH |
727 | |
728 | /* Bind the socket */ | |
3881ac44 UB |
729 | if (pr_iucv) |
730 | if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) | |
731 | goto vm_bind; /* VM IUCV transport */ | |
eac3731b | 732 | |
3881ac44 UB |
733 | /* try hiper transport */ |
734 | memcpy(uid, sa->siucv_user_id, sizeof(uid)); | |
735 | ASCEBC(uid, 8); | |
736 | rcu_read_lock(); | |
737 | for_each_netdev_rcu(&init_net, dev) { | |
738 | if (!memcmp(dev->perm_addr, uid, 8)) { | |
3881ac44 | 739 | memcpy(iucv->src_user_id, sa->siucv_user_id, 8); |
53a4b499 PH |
740 | /* Check for unitialized siucv_name */ |
741 | if (strncmp(sa->siucv_name, " ", 8) == 0) | |
742 | __iucv_auto_name(iucv); | |
743 | else | |
744 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
816abbad | 745 | sk->sk_bound_dev_if = dev->ifindex; |
800c5eb7 UB |
746 | iucv->hs_dev = dev; |
747 | dev_hold(dev); | |
3881ac44 UB |
748 | sk->sk_state = IUCV_BOUND; |
749 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
750 | if (!iucv->msglimit) | |
751 | iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; | |
752 | rcu_read_unlock(); | |
753 | goto done_unlock; | |
754 | } | |
755 | } | |
756 | rcu_read_unlock(); | |
757 | vm_bind: | |
758 | if (pr_iucv) { | |
759 | /* use local userid for backward compat */ | |
760 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
761 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
762 | sk->sk_state = IUCV_BOUND; | |
763 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
764 | if (!iucv->msglimit) | |
765 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
766 | goto done_unlock; | |
767 | } | |
768 | /* found no dev to bind */ | |
769 | err = -ENODEV; | |
eac3731b JH |
770 | done_unlock: |
771 | /* Release the socket list lock */ | |
772 | write_unlock_bh(&iucv_sk_list.lock); | |
773 | done: | |
774 | release_sock(sk); | |
775 | return err; | |
776 | } | |
777 | ||
778 | /* Automatically bind an unbound socket */ | |
779 | static int iucv_sock_autobind(struct sock *sk) | |
780 | { | |
781 | struct iucv_sock *iucv = iucv_sk(sk); | |
eac3731b JH |
782 | int err = 0; |
783 | ||
aac6399c | 784 | if (unlikely(!pr_iucv)) |
eac3731b JH |
785 | return -EPROTO; |
786 | ||
aac6399c | 787 | memcpy(iucv->src_user_id, iucv_userid, 8); |
eac3731b JH |
788 | |
789 | write_lock_bh(&iucv_sk_list.lock); | |
53a4b499 | 790 | __iucv_auto_name(iucv); |
eac3731b JH |
791 | write_unlock_bh(&iucv_sk_list.lock); |
792 | ||
3881ac44 UB |
793 | if (!iucv->msglimit) |
794 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
795 | ||
eac3731b JH |
796 | return err; |
797 | } | |
798 | ||
3881ac44 | 799 | static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) |
eac3731b JH |
800 | { |
801 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
802 | struct sock *sk = sock->sk; | |
493d3971 | 803 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
804 | unsigned char user_data[16]; |
805 | int err; | |
806 | ||
eac3731b | 807 | high_nmcpy(user_data, sa->siucv_name); |
493d3971 | 808 | low_nmcpy(user_data, iucv->src_name); |
eac3731b JH |
809 | ASCEBC(user_data, sizeof(user_data)); |
810 | ||
eac3731b | 811 | /* Create path. */ |
09488e2e | 812 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 813 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
814 | if (!iucv->path) { |
815 | err = -ENOMEM; | |
816 | goto done; | |
817 | } | |
6fcd61f7 FB |
818 | err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
819 | sa->siucv_user_id, NULL, user_data, | |
820 | sk); | |
eac3731b JH |
821 | if (err) { |
822 | iucv_path_free(iucv->path); | |
823 | iucv->path = NULL; | |
55cdea9e HB |
824 | switch (err) { |
825 | case 0x0b: /* Target communicator is not logged on */ | |
826 | err = -ENETUNREACH; | |
827 | break; | |
828 | case 0x0d: /* Max connections for this guest exceeded */ | |
829 | case 0x0e: /* Max connections for target guest exceeded */ | |
830 | err = -EAGAIN; | |
831 | break; | |
832 | case 0x0f: /* Missing IUCV authorization */ | |
833 | err = -EACCES; | |
834 | break; | |
835 | default: | |
836 | err = -ECONNREFUSED; | |
837 | break; | |
838 | } | |
eac3731b | 839 | } |
3881ac44 UB |
840 | done: |
841 | return err; | |
842 | } | |
eac3731b | 843 | |
3881ac44 UB |
844 | /* Connect an unconnected socket */ |
845 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
846 | int alen, int flags) | |
847 | { | |
848 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
849 | struct sock *sk = sock->sk; | |
850 | struct iucv_sock *iucv = iucv_sk(sk); | |
851 | int err; | |
852 | ||
853 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
854 | return -EINVAL; | |
855 | ||
856 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
857 | return -EBADFD; | |
858 | ||
859 | if (sk->sk_state == IUCV_OPEN && | |
860 | iucv->transport == AF_IUCV_TRANS_HIPER) | |
861 | return -EBADFD; /* explicit bind required */ | |
862 | ||
863 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) | |
864 | return -EINVAL; | |
865 | ||
866 | if (sk->sk_state == IUCV_OPEN) { | |
867 | err = iucv_sock_autobind(sk); | |
868 | if (unlikely(err)) | |
869 | return err; | |
870 | } | |
871 | ||
872 | lock_sock(sk); | |
873 | ||
874 | /* Set the destination information */ | |
875 | memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); | |
876 | memcpy(iucv->dst_name, sa->siucv_name, 8); | |
877 | ||
878 | if (iucv->transport == AF_IUCV_TRANS_HIPER) | |
9fbd87d4 | 879 | err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); |
3881ac44 UB |
880 | else |
881 | err = afiucv_path_connect(sock, addr); | |
882 | if (err) | |
883 | goto done; | |
884 | ||
885 | if (sk->sk_state != IUCV_CONNECTED) | |
0ea920d2 HB |
886 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
887 | IUCV_DISCONN), | |
888 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b | 889 | |
3881ac44 | 890 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
b8942e3b | 891 | err = -ECONNREFUSED; |
18becbc5 | 892 | |
7d316b94 UB |
893 | if (err && iucv->transport == AF_IUCV_TRANS_IUCV) |
894 | iucv_sever_path(sk, 0); | |
18becbc5 | 895 | |
eac3731b JH |
896 | done: |
897 | release_sock(sk); | |
898 | return err; | |
899 | } | |
900 | ||
901 | /* Move a socket into listening state. */ | |
902 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
903 | { | |
904 | struct sock *sk = sock->sk; | |
905 | int err; | |
906 | ||
907 | lock_sock(sk); | |
908 | ||
909 | err = -EINVAL; | |
aa8e71f5 HB |
910 | if (sk->sk_state != IUCV_BOUND) |
911 | goto done; | |
912 | ||
913 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
914 | goto done; |
915 | ||
916 | sk->sk_max_ack_backlog = backlog; | |
917 | sk->sk_ack_backlog = 0; | |
918 | sk->sk_state = IUCV_LISTEN; | |
919 | err = 0; | |
920 | ||
921 | done: | |
922 | release_sock(sk); | |
923 | return err; | |
924 | } | |
925 | ||
926 | /* Accept a pending connection */ | |
927 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
928 | int flags) | |
929 | { | |
930 | DECLARE_WAITQUEUE(wait, current); | |
931 | struct sock *sk = sock->sk, *nsk; | |
932 | long timeo; | |
933 | int err = 0; | |
934 | ||
561e0360 | 935 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
936 | |
937 | if (sk->sk_state != IUCV_LISTEN) { | |
938 | err = -EBADFD; | |
939 | goto done; | |
940 | } | |
941 | ||
942 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
943 | ||
944 | /* Wait for an incoming connection */ | |
aa395145 | 945 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 946 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
947 | set_current_state(TASK_INTERRUPTIBLE); |
948 | if (!timeo) { | |
949 | err = -EAGAIN; | |
950 | break; | |
951 | } | |
952 | ||
953 | release_sock(sk); | |
954 | timeo = schedule_timeout(timeo); | |
561e0360 | 955 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
956 | |
957 | if (sk->sk_state != IUCV_LISTEN) { | |
958 | err = -EBADFD; | |
959 | break; | |
960 | } | |
961 | ||
962 | if (signal_pending(current)) { | |
963 | err = sock_intr_errno(timeo); | |
964 | break; | |
965 | } | |
966 | } | |
967 | ||
968 | set_current_state(TASK_RUNNING); | |
aa395145 | 969 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
970 | |
971 | if (err) | |
972 | goto done; | |
973 | ||
974 | newsock->state = SS_CONNECTED; | |
975 | ||
976 | done: | |
977 | release_sock(sk); | |
978 | return err; | |
979 | } | |
980 | ||
981 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
982 | int *len, int peer) | |
983 | { | |
984 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
985 | struct sock *sk = sock->sk; | |
493d3971 | 986 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
987 | |
988 | addr->sa_family = AF_IUCV; | |
989 | *len = sizeof(struct sockaddr_iucv); | |
990 | ||
991 | if (peer) { | |
493d3971 UB |
992 | memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
993 | memcpy(siucv->siucv_name, iucv->dst_name, 8); | |
eac3731b | 994 | } else { |
493d3971 UB |
995 | memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
996 | memcpy(siucv->siucv_name, iucv->src_name, 8); | |
eac3731b JH |
997 | } |
998 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
999 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
493d3971 | 1000 | memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
eac3731b JH |
1001 | |
1002 | return 0; | |
1003 | } | |
1004 | ||
b8942e3b HB |
1005 | /** |
1006 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
1007 | * @path: IUCV path | |
1008 | * @msg: Pointer to a struct iucv_message | |
1009 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
1010 | * | |
1011 | * Send the socket data in the parameter list in the iucv message | |
1012 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
1013 | * list and the socket data len at index 7 (last byte). | |
1014 | * See also iucv_msg_length(). | |
1015 | * | |
1016 | * Returns the error code from the iucv_message_send() call. | |
1017 | */ | |
1018 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
1019 | struct sk_buff *skb) | |
1020 | { | |
1021 | u8 prmdata[8]; | |
1022 | ||
1023 | memcpy(prmdata, (void *) skb->data, skb->len); | |
1024 | prmdata[7] = 0xff - (u8) skb->len; | |
6fcd61f7 | 1025 | return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
b8942e3b HB |
1026 | (void *) prmdata, 8); |
1027 | } | |
1028 | ||
eac3731b JH |
1029 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1030 | struct msghdr *msg, size_t len) | |
1031 | { | |
1032 | struct sock *sk = sock->sk; | |
1033 | struct iucv_sock *iucv = iucv_sk(sk); | |
1034 | struct sk_buff *skb; | |
1035 | struct iucv_message txmsg; | |
44b1e6b5 HB |
1036 | struct cmsghdr *cmsg; |
1037 | int cmsg_done; | |
0ea920d2 | 1038 | long timeo; |
8f7c502c UB |
1039 | char user_id[9]; |
1040 | char appl_id[9]; | |
eac3731b | 1041 | int err; |
0ea920d2 | 1042 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
1043 | |
1044 | err = sock_error(sk); | |
1045 | if (err) | |
1046 | return err; | |
1047 | ||
1048 | if (msg->msg_flags & MSG_OOB) | |
1049 | return -EOPNOTSUPP; | |
1050 | ||
aa8e71f5 HB |
1051 | /* SOCK_SEQPACKET: we do not support segmented records */ |
1052 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
1053 | return -EOPNOTSUPP; | |
1054 | ||
eac3731b JH |
1055 | lock_sock(sk); |
1056 | ||
1057 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1058 | err = -EPIPE; | |
1059 | goto out; | |
1060 | } | |
1061 | ||
bb664f49 HB |
1062 | /* Return if the socket is not in connected state */ |
1063 | if (sk->sk_state != IUCV_CONNECTED) { | |
1064 | err = -ENOTCONN; | |
1065 | goto out; | |
1066 | } | |
44b1e6b5 | 1067 | |
bb664f49 HB |
1068 | /* initialize defaults */ |
1069 | cmsg_done = 0; /* check for duplicate headers */ | |
1070 | txmsg.class = 0; | |
44b1e6b5 | 1071 | |
bb664f49 | 1072 | /* iterate over control messages */ |
f95b414e | 1073 | for_each_cmsghdr(cmsg, msg) { |
bb664f49 HB |
1074 | if (!CMSG_OK(msg, cmsg)) { |
1075 | err = -EINVAL; | |
1076 | goto out; | |
1077 | } | |
44b1e6b5 | 1078 | |
bb664f49 HB |
1079 | if (cmsg->cmsg_level != SOL_IUCV) |
1080 | continue; | |
44b1e6b5 | 1081 | |
bb664f49 HB |
1082 | if (cmsg->cmsg_type & cmsg_done) { |
1083 | err = -EINVAL; | |
1084 | goto out; | |
1085 | } | |
1086 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 1087 | |
bb664f49 HB |
1088 | switch (cmsg->cmsg_type) { |
1089 | case SCM_IUCV_TRGCLS: | |
1090 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
1091 | err = -EINVAL; |
1092 | goto out; | |
1093 | } | |
44b1e6b5 | 1094 | |
bb664f49 HB |
1095 | /* set iucv message target class */ |
1096 | memcpy(&txmsg.class, | |
1097 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 1098 | |
bb664f49 | 1099 | break; |
44b1e6b5 | 1100 | |
bb664f49 HB |
1101 | default: |
1102 | err = -EINVAL; | |
1103 | goto out; | |
44b1e6b5 | 1104 | } |
bb664f49 | 1105 | } |
44b1e6b5 | 1106 | |
bb664f49 HB |
1107 | /* allocate one skb for each iucv message: |
1108 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
1109 | * segmented records using the MSG_EOR flag), but | |
1110 | * for SOCK_STREAM we might want to improve it in future */ | |
3881ac44 UB |
1111 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1112 | skb = sock_alloc_send_skb(sk, | |
1113 | len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, | |
1114 | noblock, &err); | |
1115 | else | |
1116 | skb = sock_alloc_send_skb(sk, len, noblock, &err); | |
800c5eb7 UB |
1117 | if (!skb) { |
1118 | err = -ENOMEM; | |
bb664f49 | 1119 | goto out; |
800c5eb7 | 1120 | } |
3881ac44 UB |
1121 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1122 | skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); | |
6ce8e9ce | 1123 | if (memcpy_from_msg(skb_put(skb, len), msg, len)) { |
bb664f49 HB |
1124 | err = -EFAULT; |
1125 | goto fail; | |
1126 | } | |
eac3731b | 1127 | |
0ea920d2 HB |
1128 | /* wait if outstanding messages for iucv path has reached */ |
1129 | timeo = sock_sndtimeo(sk, noblock); | |
1130 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
1131 | if (err) | |
1132 | goto fail; | |
eac3731b | 1133 | |
0ea920d2 HB |
1134 | /* return -ECONNRESET if the socket is no longer connected */ |
1135 | if (sk->sk_state != IUCV_CONNECTED) { | |
1136 | err = -ECONNRESET; | |
1137 | goto fail; | |
1138 | } | |
b8942e3b | 1139 | |
bb664f49 HB |
1140 | /* increment and save iucv message tag for msg_completion cbk */ |
1141 | txmsg.tag = iucv->send_tag++; | |
f9c41a62 | 1142 | IUCV_SKB_CB(skb)->tag = txmsg.tag; |
800c5eb7 | 1143 | |
3881ac44 UB |
1144 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1145 | atomic_inc(&iucv->msg_sent); | |
1146 | err = afiucv_hs_send(&txmsg, sk, skb, 0); | |
1147 | if (err) { | |
1148 | atomic_dec(&iucv->msg_sent); | |
1149 | goto fail; | |
1150 | } | |
1151 | goto release; | |
1152 | } | |
bb664f49 | 1153 | skb_queue_tail(&iucv->send_skb_q, skb); |
b8942e3b | 1154 | |
bb664f49 HB |
1155 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
1156 | && skb->len <= 7) { | |
1157 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 1158 | |
bb664f49 HB |
1159 | /* on success: there is no message_complete callback |
1160 | * for an IPRMDATA msg; remove skb from send queue */ | |
1161 | if (err == 0) { | |
1162 | skb_unlink(skb, &iucv->send_skb_q); | |
1163 | kfree_skb(skb); | |
1164 | } | |
1165 | ||
1166 | /* this error should never happen since the | |
1167 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1168 | if (err == 0x15) { | |
6fcd61f7 | 1169 | pr_iucv->path_sever(iucv->path, NULL); |
eac3731b JH |
1170 | skb_unlink(skb, &iucv->send_skb_q); |
1171 | err = -EPIPE; | |
1172 | goto fail; | |
1173 | } | |
bb664f49 | 1174 | } else |
6fcd61f7 | 1175 | err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, |
bb664f49 HB |
1176 | (void *) skb->data, skb->len); |
1177 | if (err) { | |
1178 | if (err == 3) { | |
1179 | user_id[8] = 0; | |
1180 | memcpy(user_id, iucv->dst_user_id, 8); | |
1181 | appl_id[8] = 0; | |
1182 | memcpy(appl_id, iucv->dst_name, 8); | |
1183 | pr_err("Application %s on z/VM guest %s" | |
1184 | " exceeds message limit\n", | |
1185 | appl_id, user_id); | |
0ea920d2 HB |
1186 | err = -EAGAIN; |
1187 | } else | |
1188 | err = -EPIPE; | |
bb664f49 | 1189 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1190 | goto fail; |
eac3731b JH |
1191 | } |
1192 | ||
3881ac44 | 1193 | release: |
eac3731b JH |
1194 | release_sock(sk); |
1195 | return len; | |
1196 | ||
1197 | fail: | |
1198 | kfree_skb(skb); | |
1199 | out: | |
1200 | release_sock(sk); | |
1201 | return err; | |
1202 | } | |
1203 | ||
bf95d20f HB |
1204 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1205 | * | |
1206 | * Locking: must be called with message_q.lock held | |
1207 | */ | |
f0703c80 UB |
1208 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1209 | { | |
1210 | int dataleft, size, copied = 0; | |
1211 | struct sk_buff *nskb; | |
1212 | ||
1213 | dataleft = len; | |
1214 | while (dataleft) { | |
1215 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1216 | size = sk->sk_rcvbuf / 4; | |
1217 | else | |
1218 | size = dataleft; | |
1219 | ||
1220 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1221 | if (!nskb) | |
1222 | return -ENOMEM; | |
1223 | ||
44b1e6b5 | 1224 | /* copy target class to control buffer of new skb */ |
f9c41a62 | 1225 | IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class; |
44b1e6b5 HB |
1226 | |
1227 | /* copy data fragment */ | |
f0703c80 UB |
1228 | memcpy(nskb->data, skb->data + copied, size); |
1229 | copied += size; | |
1230 | dataleft -= size; | |
1231 | ||
1232 | skb_reset_transport_header(nskb); | |
1233 | skb_reset_network_header(nskb); | |
1234 | nskb->len = size; | |
1235 | ||
1236 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1237 | } | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | ||
bf95d20f HB |
1242 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1243 | * | |
1244 | * Locking: must be called with message_q.lock held | |
1245 | */ | |
f0703c80 UB |
1246 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1247 | struct iucv_path *path, | |
1248 | struct iucv_message *msg) | |
1249 | { | |
1250 | int rc; | |
b8942e3b HB |
1251 | unsigned int len; |
1252 | ||
1253 | len = iucv_msg_length(msg); | |
f0703c80 | 1254 | |
44b1e6b5 HB |
1255 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1256 | /* Note: the first 4 bytes are reserved for msg tag */ | |
f9c41a62 | 1257 | IUCV_SKB_CB(skb)->class = msg->class; |
44b1e6b5 | 1258 | |
b8942e3b HB |
1259 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1260 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1261 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1262 | skb->data = NULL; | |
1263 | skb->len = 0; | |
1264 | } | |
f0703c80 | 1265 | } else { |
6fcd61f7 FB |
1266 | rc = pr_iucv->message_receive(path, msg, |
1267 | msg->flags & IUCV_IPRMDATA, | |
1268 | skb->data, len, NULL); | |
f0703c80 UB |
1269 | if (rc) { |
1270 | kfree_skb(skb); | |
1271 | return; | |
1272 | } | |
aa8e71f5 HB |
1273 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1274 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1275 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1276 | if (sk->sk_type == SOCK_STREAM && | |
1277 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1278 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1279 | kfree_skb(skb); |
1280 | skb = NULL; | |
1281 | if (rc) { | |
6fcd61f7 | 1282 | pr_iucv->path_sever(path, NULL); |
f0703c80 UB |
1283 | return; |
1284 | } | |
1285 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1286 | } else { | |
1287 | skb_reset_transport_header(skb); | |
1288 | skb_reset_network_header(skb); | |
b8942e3b | 1289 | skb->len = len; |
f0703c80 UB |
1290 | } |
1291 | } | |
1292 | ||
f9c41a62 | 1293 | IUCV_SKB_CB(skb)->offset = 0; |
f0703c80 UB |
1294 | if (sock_queue_rcv_skb(sk, skb)) |
1295 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1296 | } | |
1297 | ||
bf95d20f HB |
1298 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1299 | * | |
1300 | * Locking: must be called with message_q.lock held | |
1301 | */ | |
f0703c80 UB |
1302 | static void iucv_process_message_q(struct sock *sk) |
1303 | { | |
1304 | struct iucv_sock *iucv = iucv_sk(sk); | |
1305 | struct sk_buff *skb; | |
1306 | struct sock_msg_q *p, *n; | |
1307 | ||
1308 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1309 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1310 | if (!skb) |
1311 | break; | |
1312 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1313 | list_del(&p->list); | |
1314 | kfree(p); | |
1315 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1316 | break; | |
1317 | } | |
1318 | } | |
1319 | ||
eac3731b JH |
1320 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1321 | struct msghdr *msg, size_t len, int flags) | |
1322 | { | |
1323 | int noblock = flags & MSG_DONTWAIT; | |
1324 | struct sock *sk = sock->sk; | |
561e0360 | 1325 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1326 | unsigned int copied, rlen; |
9fbd87d4 | 1327 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b | 1328 | int err = 0; |
f9c41a62 | 1329 | u32 offset; |
eac3731b | 1330 | |
aac6399c | 1331 | if ((sk->sk_state == IUCV_DISCONN) && |
f0703c80 UB |
1332 | skb_queue_empty(&iucv->backlog_skb_q) && |
1333 | skb_queue_empty(&sk->sk_receive_queue) && | |
1334 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1335 | return 0; |
1336 | ||
eac3731b JH |
1337 | if (flags & (MSG_OOB)) |
1338 | return -EOPNOTSUPP; | |
1339 | ||
60d3705f HB |
1340 | /* receive/dequeue next skb: |
1341 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1342 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1343 | if (!skb) { | |
1344 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1345 | return 0; | |
1346 | return err; | |
1347 | } | |
1348 | ||
f9c41a62 UB |
1349 | offset = IUCV_SKB_CB(skb)->offset; |
1350 | rlen = skb->len - offset; /* real length of skb */ | |
aa8e71f5 | 1351 | copied = min_t(unsigned int, rlen, len); |
82492a35 UB |
1352 | if (!rlen) |
1353 | sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; | |
eac3731b | 1354 | |
561e0360 | 1355 | cskb = skb; |
51f3d02b | 1356 | if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { |
802788bf HB |
1357 | if (!(flags & MSG_PEEK)) |
1358 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1359 | return -EFAULT; | |
eac3731b JH |
1360 | } |
1361 | ||
aa8e71f5 HB |
1362 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1363 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1364 | if (copied < rlen) | |
1365 | msg->msg_flags |= MSG_TRUNC; | |
1366 | /* each iucv message contains a complete record */ | |
1367 | msg->msg_flags |= MSG_EOR; | |
1368 | } | |
eac3731b | 1369 | |
44b1e6b5 HB |
1370 | /* create control message to store iucv msg target class: |
1371 | * get the trgcls from the control buffer of the skb due to | |
1372 | * fragmentation of original iucv message. */ | |
1373 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
f9c41a62 UB |
1374 | sizeof(IUCV_SKB_CB(skb)->class), |
1375 | (void *)&IUCV_SKB_CB(skb)->class); | |
44b1e6b5 HB |
1376 | if (err) { |
1377 | if (!(flags & MSG_PEEK)) | |
1378 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1379 | return err; | |
1380 | } | |
1381 | ||
eac3731b JH |
1382 | /* Mark read part of skb as used */ |
1383 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1384 | |
aa8e71f5 HB |
1385 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1386 | if (sk->sk_type == SOCK_STREAM) { | |
f9c41a62 UB |
1387 | if (copied < rlen) { |
1388 | IUCV_SKB_CB(skb)->offset = offset + copied; | |
2f139a5d | 1389 | skb_queue_head(&sk->sk_receive_queue, skb); |
aa8e71f5 HB |
1390 | goto done; |
1391 | } | |
eac3731b JH |
1392 | } |
1393 | ||
1394 | kfree_skb(skb); | |
800c5eb7 UB |
1395 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1396 | atomic_inc(&iucv->msg_recv); | |
1397 | if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { | |
1398 | WARN_ON(1); | |
1399 | iucv_sock_close(sk); | |
1400 | return -EFAULT; | |
1401 | } | |
1402 | } | |
561e0360 JH |
1403 | |
1404 | /* Queue backlog skbs */ | |
bf95d20f | 1405 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1406 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1407 | while (rskb) { |
f9c41a62 | 1408 | IUCV_SKB_CB(rskb)->offset = 0; |
561e0360 | 1409 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1410 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1411 | rskb); |
1412 | break; | |
1413 | } else { | |
f0703c80 | 1414 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1415 | } |
1416 | } | |
f0703c80 | 1417 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1418 | if (!list_empty(&iucv->message_q.list)) |
1419 | iucv_process_message_q(sk); | |
3881ac44 UB |
1420 | if (atomic_read(&iucv->msg_recv) >= |
1421 | iucv->msglimit / 2) { | |
9fbd87d4 | 1422 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); |
3881ac44 UB |
1423 | if (err) { |
1424 | sk->sk_state = IUCV_DISCONN; | |
1425 | sk->sk_state_change(sk); | |
1426 | } | |
1427 | } | |
f0703c80 | 1428 | } |
bf95d20f | 1429 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1430 | } |
eac3731b JH |
1431 | |
1432 | done: | |
aa8e71f5 HB |
1433 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1434 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1435 | copied = rlen; | |
1436 | ||
1437 | return copied; | |
eac3731b JH |
1438 | } |
1439 | ||
1440 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1441 | { | |
1442 | struct iucv_sock *isk, *n; | |
1443 | struct sock *sk; | |
1444 | ||
da99f056 | 1445 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1446 | sk = (struct sock *) isk; |
1447 | ||
1448 | if (sk->sk_state == IUCV_CONNECTED) | |
1449 | return POLLIN | POLLRDNORM; | |
1450 | } | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1456 | poll_table *wait) | |
1457 | { | |
1458 | struct sock *sk = sock->sk; | |
1459 | unsigned int mask = 0; | |
1460 | ||
aa395145 | 1461 | sock_poll_wait(file, sk_sleep(sk), wait); |
eac3731b JH |
1462 | |
1463 | if (sk->sk_state == IUCV_LISTEN) | |
1464 | return iucv_accept_poll(sk); | |
1465 | ||
1466 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
7d4c04fc | 1467 | mask |= POLLERR | |
8facd5fb | 1468 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); |
eac3731b JH |
1469 | |
1470 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1471 | mask |= POLLRDHUP; | |
1472 | ||
1473 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1474 | mask |= POLLHUP; | |
1475 | ||
1476 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1477 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1478 | mask |= POLLIN | POLLRDNORM; |
1479 | ||
1480 | if (sk->sk_state == IUCV_CLOSED) | |
1481 | mask |= POLLHUP; | |
1482 | ||
aac6399c | 1483 | if (sk->sk_state == IUCV_DISCONN) |
561e0360 JH |
1484 | mask |= POLLIN; |
1485 | ||
7f1b0ea4 | 1486 | if (sock_writeable(sk) && iucv_below_msglim(sk)) |
eac3731b JH |
1487 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
1488 | else | |
1489 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1490 | ||
1491 | return mask; | |
1492 | } | |
1493 | ||
1494 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1495 | { | |
1496 | struct sock *sk = sock->sk; | |
1497 | struct iucv_sock *iucv = iucv_sk(sk); | |
1498 | struct iucv_message txmsg; | |
1499 | int err = 0; | |
eac3731b JH |
1500 | |
1501 | how++; | |
1502 | ||
1503 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1504 | return -EINVAL; | |
1505 | ||
1506 | lock_sock(sk); | |
da99f056 | 1507 | switch (sk->sk_state) { |
82492a35 | 1508 | case IUCV_LISTEN: |
e14ad5fa HB |
1509 | case IUCV_DISCONN: |
1510 | case IUCV_CLOSING: | |
eac3731b JH |
1511 | case IUCV_CLOSED: |
1512 | err = -ENOTCONN; | |
1513 | goto fail; | |
eac3731b | 1514 | default: |
eac3731b JH |
1515 | break; |
1516 | } | |
1517 | ||
1518 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
82492a35 UB |
1519 | if (iucv->transport == AF_IUCV_TRANS_IUCV) { |
1520 | txmsg.class = 0; | |
1521 | txmsg.tag = 0; | |
1522 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1523 | IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); | |
1524 | if (err) { | |
1525 | switch (err) { | |
1526 | case 1: | |
1527 | err = -ENOTCONN; | |
1528 | break; | |
1529 | case 2: | |
1530 | err = -ECONNRESET; | |
1531 | break; | |
1532 | default: | |
1533 | err = -ENOTCONN; | |
1534 | break; | |
1535 | } | |
eac3731b | 1536 | } |
82492a35 UB |
1537 | } else |
1538 | iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); | |
eac3731b JH |
1539 | } |
1540 | ||
82492a35 | 1541 | sk->sk_shutdown |= how; |
eac3731b | 1542 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { |
1042cab8 UB |
1543 | if ((iucv->transport == AF_IUCV_TRANS_IUCV) && |
1544 | iucv->path) { | |
82492a35 UB |
1545 | err = pr_iucv->path_quiesce(iucv->path, NULL); |
1546 | if (err) | |
1547 | err = -ENOTCONN; | |
1548 | /* skb_queue_purge(&sk->sk_receive_queue); */ | |
1549 | } | |
eac3731b JH |
1550 | skb_queue_purge(&sk->sk_receive_queue); |
1551 | } | |
1552 | ||
1553 | /* Wake up anyone sleeping in poll */ | |
1554 | sk->sk_state_change(sk); | |
1555 | ||
1556 | fail: | |
1557 | release_sock(sk); | |
1558 | return err; | |
1559 | } | |
1560 | ||
1561 | static int iucv_sock_release(struct socket *sock) | |
1562 | { | |
1563 | struct sock *sk = sock->sk; | |
1564 | int err = 0; | |
1565 | ||
1566 | if (!sk) | |
1567 | return 0; | |
1568 | ||
1569 | iucv_sock_close(sk); | |
1570 | ||
eac3731b JH |
1571 | sock_orphan(sk); |
1572 | iucv_sock_kill(sk); | |
1573 | return err; | |
1574 | } | |
1575 | ||
9d5c5d8f HB |
1576 | /* getsockopt and setsockopt */ |
1577 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1578 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1579 | { |
1580 | struct sock *sk = sock->sk; | |
1581 | struct iucv_sock *iucv = iucv_sk(sk); | |
1582 | int val; | |
1583 | int rc; | |
1584 | ||
1585 | if (level != SOL_IUCV) | |
1586 | return -ENOPROTOOPT; | |
1587 | ||
1588 | if (optlen < sizeof(int)) | |
1589 | return -EINVAL; | |
1590 | ||
1591 | if (get_user(val, (int __user *) optval)) | |
1592 | return -EFAULT; | |
1593 | ||
1594 | rc = 0; | |
1595 | ||
1596 | lock_sock(sk); | |
1597 | switch (optname) { | |
1598 | case SO_IPRMDATA_MSG: | |
1599 | if (val) | |
1600 | iucv->flags |= IUCV_IPRMDATA; | |
1601 | else | |
1602 | iucv->flags &= ~IUCV_IPRMDATA; | |
1603 | break; | |
09488e2e HB |
1604 | case SO_MSGLIMIT: |
1605 | switch (sk->sk_state) { | |
1606 | case IUCV_OPEN: | |
1607 | case IUCV_BOUND: | |
1608 | if (val < 1 || val > (u16)(~0)) | |
1609 | rc = -EINVAL; | |
1610 | else | |
1611 | iucv->msglimit = val; | |
1612 | break; | |
1613 | default: | |
1614 | rc = -EINVAL; | |
1615 | break; | |
1616 | } | |
1617 | break; | |
9d5c5d8f HB |
1618 | default: |
1619 | rc = -ENOPROTOOPT; | |
1620 | break; | |
1621 | } | |
1622 | release_sock(sk); | |
1623 | ||
1624 | return rc; | |
1625 | } | |
1626 | ||
1627 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1628 | char __user *optval, int __user *optlen) | |
1629 | { | |
1630 | struct sock *sk = sock->sk; | |
1631 | struct iucv_sock *iucv = iucv_sk(sk); | |
51363b87 UB |
1632 | unsigned int val; |
1633 | int len; | |
9d5c5d8f HB |
1634 | |
1635 | if (level != SOL_IUCV) | |
1636 | return -ENOPROTOOPT; | |
1637 | ||
1638 | if (get_user(len, optlen)) | |
1639 | return -EFAULT; | |
1640 | ||
1641 | if (len < 0) | |
1642 | return -EINVAL; | |
1643 | ||
1644 | len = min_t(unsigned int, len, sizeof(int)); | |
1645 | ||
1646 | switch (optname) { | |
1647 | case SO_IPRMDATA_MSG: | |
1648 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1649 | break; | |
09488e2e HB |
1650 | case SO_MSGLIMIT: |
1651 | lock_sock(sk); | |
1652 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1653 | : iucv->msglimit; /* default */ | |
1654 | release_sock(sk); | |
1655 | break; | |
51363b87 UB |
1656 | case SO_MSGSIZE: |
1657 | if (sk->sk_state == IUCV_OPEN) | |
1658 | return -EBADFD; | |
1659 | val = (iucv->hs_dev) ? iucv->hs_dev->mtu - | |
1660 | sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : | |
1661 | 0x7fffffff; | |
1662 | break; | |
9d5c5d8f HB |
1663 | default: |
1664 | return -ENOPROTOOPT; | |
1665 | } | |
1666 | ||
1667 | if (put_user(len, optlen)) | |
1668 | return -EFAULT; | |
1669 | if (copy_to_user(optval, &val, len)) | |
1670 | return -EFAULT; | |
1671 | ||
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | ||
eac3731b JH |
1676 | /* Callback wrappers - called from iucv base support */ |
1677 | static int iucv_callback_connreq(struct iucv_path *path, | |
1678 | u8 ipvmid[8], u8 ipuser[16]) | |
1679 | { | |
1680 | unsigned char user_data[16]; | |
1681 | unsigned char nuser_data[16]; | |
1682 | unsigned char src_name[8]; | |
eac3731b JH |
1683 | struct sock *sk, *nsk; |
1684 | struct iucv_sock *iucv, *niucv; | |
1685 | int err; | |
1686 | ||
1687 | memcpy(src_name, ipuser, 8); | |
1688 | EBCASC(src_name, 8); | |
1689 | /* Find out if this path belongs to af_iucv. */ | |
1690 | read_lock(&iucv_sk_list.lock); | |
1691 | iucv = NULL; | |
febca281 | 1692 | sk = NULL; |
b67bfe0d | 1693 | sk_for_each(sk, &iucv_sk_list.head) |
eac3731b JH |
1694 | if (sk->sk_state == IUCV_LISTEN && |
1695 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1696 | /* | |
1697 | * Found a listening socket with | |
1698 | * src_name == ipuser[0-7]. | |
1699 | */ | |
1700 | iucv = iucv_sk(sk); | |
1701 | break; | |
1702 | } | |
1703 | read_unlock(&iucv_sk_list.lock); | |
1704 | if (!iucv) | |
1705 | /* No socket found, not one of our paths. */ | |
1706 | return -EINVAL; | |
1707 | ||
1708 | bh_lock_sock(sk); | |
1709 | ||
1710 | /* Check if parent socket is listening */ | |
1711 | low_nmcpy(user_data, iucv->src_name); | |
1712 | high_nmcpy(user_data, iucv->dst_name); | |
1713 | ASCEBC(user_data, sizeof(user_data)); | |
1714 | if (sk->sk_state != IUCV_LISTEN) { | |
6fcd61f7 | 1715 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1716 | iucv_path_free(path); |
eac3731b JH |
1717 | goto fail; |
1718 | } | |
1719 | ||
1720 | /* Check for backlog size */ | |
1721 | if (sk_acceptq_is_full(sk)) { | |
6fcd61f7 | 1722 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1723 | iucv_path_free(path); |
eac3731b JH |
1724 | goto fail; |
1725 | } | |
1726 | ||
1727 | /* Create the new socket */ | |
aa8e71f5 | 1728 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
da99f056 | 1729 | if (!nsk) { |
6fcd61f7 | 1730 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1731 | iucv_path_free(path); |
eac3731b JH |
1732 | goto fail; |
1733 | } | |
1734 | ||
1735 | niucv = iucv_sk(nsk); | |
1736 | iucv_sock_init(nsk, sk); | |
1737 | ||
1738 | /* Set the new iucv_sock */ | |
1739 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1740 | EBCASC(niucv->dst_name, 8); | |
1741 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1742 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1743 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1744 | niucv->path = path; | |
1745 | ||
1746 | /* Call iucv_accept */ | |
1747 | high_nmcpy(nuser_data, ipuser + 8); | |
1748 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1749 | ASCEBC(nuser_data + 8, 8); | |
1750 | ||
09488e2e HB |
1751 | /* set message limit for path based on msglimit of accepting socket */ |
1752 | niucv->msglimit = iucv->msglimit; | |
1753 | path->msglim = iucv->msglimit; | |
6fcd61f7 | 1754 | err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1755 | if (err) { |
7d316b94 | 1756 | iucv_sever_path(nsk, 1); |
65dbd7c2 | 1757 | iucv_sock_kill(nsk); |
eac3731b JH |
1758 | goto fail; |
1759 | } | |
1760 | ||
1761 | iucv_accept_enqueue(sk, nsk); | |
1762 | ||
1763 | /* Wake up accept */ | |
1764 | nsk->sk_state = IUCV_CONNECTED; | |
676d2369 | 1765 | sk->sk_data_ready(sk); |
eac3731b JH |
1766 | err = 0; |
1767 | fail: | |
1768 | bh_unlock_sock(sk); | |
1769 | return 0; | |
1770 | } | |
1771 | ||
1772 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1773 | { | |
1774 | struct sock *sk = path->private; | |
1775 | ||
1776 | sk->sk_state = IUCV_CONNECTED; | |
1777 | sk->sk_state_change(sk); | |
1778 | } | |
1779 | ||
1780 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1781 | { | |
1782 | struct sock *sk = path->private; | |
561e0360 | 1783 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1784 | struct sk_buff *skb; |
1785 | struct sock_msg_q *save_msg; | |
1786 | int len; | |
561e0360 | 1787 | |
fe86e54e | 1788 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
6fcd61f7 | 1789 | pr_iucv->message_reject(path, msg); |
eac3731b | 1790 | return; |
fe86e54e | 1791 | } |
eac3731b | 1792 | |
3fa6b5ad | 1793 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1794 | |
f0703c80 UB |
1795 | if (!list_empty(&iucv->message_q.list) || |
1796 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1797 | goto save_message; | |
1798 | ||
1799 | len = atomic_read(&sk->sk_rmem_alloc); | |
87fb4b7b | 1800 | len += SKB_TRUESIZE(iucv_msg_length(msg)); |
f0703c80 UB |
1801 | if (len > sk->sk_rcvbuf) |
1802 | goto save_message; | |
1803 | ||
b8942e3b | 1804 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1805 | if (!skb) |
1806 | goto save_message; | |
eac3731b | 1807 | |
f0703c80 | 1808 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1809 | goto out_unlock; |
eac3731b | 1810 | |
f0703c80 UB |
1811 | save_message: |
1812 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1813 | if (!save_msg) |
a56635a5 | 1814 | goto out_unlock; |
f0703c80 UB |
1815 | save_msg->path = path; |
1816 | save_msg->msg = *msg; | |
eac3731b | 1817 | |
f0703c80 | 1818 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1819 | |
1820 | out_unlock: | |
f0703c80 | 1821 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1822 | } |
1823 | ||
1824 | static void iucv_callback_txdone(struct iucv_path *path, | |
1825 | struct iucv_message *msg) | |
1826 | { | |
1827 | struct sock *sk = path->private; | |
f2a77991 | 1828 | struct sk_buff *this = NULL; |
eac3731b JH |
1829 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1830 | struct sk_buff *list_skb = list->next; | |
1831 | unsigned long flags; | |
1832 | ||
7d316b94 | 1833 | bh_lock_sock(sk); |
f2a77991 | 1834 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1835 | spin_lock_irqsave(&list->lock, flags); |
1836 | ||
f2a77991 | 1837 | while (list_skb != (struct sk_buff *)list) { |
f5738e2e | 1838 | if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { |
f2a77991 UB |
1839 | this = list_skb; |
1840 | break; | |
1841 | } | |
561e0360 | 1842 | list_skb = list_skb->next; |
f2a77991 UB |
1843 | } |
1844 | if (this) | |
1845 | __skb_unlink(this, list); | |
561e0360 JH |
1846 | |
1847 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1848 | |
0ea920d2 HB |
1849 | if (this) { |
1850 | kfree_skb(this); | |
1851 | /* wake up any process waiting for sending */ | |
1852 | iucv_sock_wake_msglim(sk); | |
1853 | } | |
561e0360 | 1854 | } |
eac3731b | 1855 | |
da99f056 | 1856 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1857 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1858 | sk->sk_state = IUCV_CLOSED; | |
1859 | sk->sk_state_change(sk); | |
1860 | } | |
1861 | } | |
7d316b94 | 1862 | bh_unlock_sock(sk); |
eac3731b | 1863 | |
eac3731b JH |
1864 | } |
1865 | ||
1866 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1867 | { | |
1868 | struct sock *sk = path->private; | |
1869 | ||
7d316b94 UB |
1870 | if (sk->sk_state == IUCV_CLOSED) |
1871 | return; | |
1872 | ||
1873 | bh_lock_sock(sk); | |
1874 | iucv_sever_path(sk, 1); | |
aac6399c | 1875 | sk->sk_state = IUCV_DISCONN; |
eac3731b JH |
1876 | |
1877 | sk->sk_state_change(sk); | |
7d316b94 | 1878 | bh_unlock_sock(sk); |
eac3731b JH |
1879 | } |
1880 | ||
af88b52d HB |
1881 | /* called if the other communication side shuts down its RECV direction; |
1882 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1883 | */ | |
1884 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1885 | { | |
1886 | struct sock *sk = path->private; | |
1887 | ||
1888 | bh_lock_sock(sk); | |
1889 | if (sk->sk_state != IUCV_CLOSED) { | |
1890 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1891 | sk->sk_state_change(sk); | |
1892 | } | |
1893 | bh_unlock_sock(sk); | |
1894 | } | |
1895 | ||
3881ac44 UB |
1896 | /***************** HiperSockets transport callbacks ********************/ |
1897 | static void afiucv_swap_src_dest(struct sk_buff *skb) | |
1898 | { | |
1899 | struct af_iucv_trans_hdr *trans_hdr = | |
1900 | (struct af_iucv_trans_hdr *)skb->data; | |
1901 | char tmpID[8]; | |
1902 | char tmpName[8]; | |
1903 | ||
1904 | ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
1905 | ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
1906 | ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
1907 | ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
1908 | memcpy(tmpID, trans_hdr->srcUserID, 8); | |
1909 | memcpy(tmpName, trans_hdr->srcAppName, 8); | |
1910 | memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); | |
1911 | memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); | |
1912 | memcpy(trans_hdr->destUserID, tmpID, 8); | |
1913 | memcpy(trans_hdr->destAppName, tmpName, 8); | |
1914 | skb_push(skb, ETH_HLEN); | |
1915 | memset(skb->data, 0, ETH_HLEN); | |
1916 | } | |
1917 | ||
1918 | /** | |
1919 | * afiucv_hs_callback_syn - react on received SYN | |
1920 | **/ | |
1921 | static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) | |
1922 | { | |
1923 | struct sock *nsk; | |
1924 | struct iucv_sock *iucv, *niucv; | |
1925 | struct af_iucv_trans_hdr *trans_hdr; | |
1926 | int err; | |
1927 | ||
1928 | iucv = iucv_sk(sk); | |
1929 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
1930 | if (!iucv) { | |
1931 | /* no sock - connection refused */ | |
1932 | afiucv_swap_src_dest(skb); | |
1933 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1934 | err = dev_queue_xmit(skb); | |
1935 | goto out; | |
1936 | } | |
1937 | ||
1938 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); | |
1939 | bh_lock_sock(sk); | |
1940 | if ((sk->sk_state != IUCV_LISTEN) || | |
1941 | sk_acceptq_is_full(sk) || | |
1942 | !nsk) { | |
1943 | /* error on server socket - connection refused */ | |
3881ac44 UB |
1944 | afiucv_swap_src_dest(skb); |
1945 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1946 | err = dev_queue_xmit(skb); | |
4d520f62 | 1947 | iucv_sock_kill(nsk); |
3881ac44 UB |
1948 | bh_unlock_sock(sk); |
1949 | goto out; | |
1950 | } | |
1951 | ||
1952 | niucv = iucv_sk(nsk); | |
1953 | iucv_sock_init(nsk, sk); | |
1954 | niucv->transport = AF_IUCV_TRANS_HIPER; | |
1955 | niucv->msglimit = iucv->msglimit; | |
1956 | if (!trans_hdr->window) | |
1957 | niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; | |
1958 | else | |
1959 | niucv->msglimit_peer = trans_hdr->window; | |
1960 | memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); | |
1961 | memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); | |
1962 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1963 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1964 | nsk->sk_bound_dev_if = sk->sk_bound_dev_if; | |
800c5eb7 UB |
1965 | niucv->hs_dev = iucv->hs_dev; |
1966 | dev_hold(niucv->hs_dev); | |
3881ac44 UB |
1967 | afiucv_swap_src_dest(skb); |
1968 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; | |
1969 | trans_hdr->window = niucv->msglimit; | |
1970 | /* if receiver acks the xmit connection is established */ | |
1971 | err = dev_queue_xmit(skb); | |
1972 | if (!err) { | |
1973 | iucv_accept_enqueue(sk, nsk); | |
1974 | nsk->sk_state = IUCV_CONNECTED; | |
676d2369 | 1975 | sk->sk_data_ready(sk); |
3881ac44 UB |
1976 | } else |
1977 | iucv_sock_kill(nsk); | |
1978 | bh_unlock_sock(sk); | |
1979 | ||
1980 | out: | |
1981 | return NET_RX_SUCCESS; | |
1982 | } | |
1983 | ||
1984 | /** | |
1985 | * afiucv_hs_callback_synack() - react on received SYN-ACK | |
1986 | **/ | |
1987 | static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) | |
1988 | { | |
1989 | struct iucv_sock *iucv = iucv_sk(sk); | |
1990 | struct af_iucv_trans_hdr *trans_hdr = | |
1991 | (struct af_iucv_trans_hdr *)skb->data; | |
1992 | ||
1993 | if (!iucv) | |
1994 | goto out; | |
1995 | if (sk->sk_state != IUCV_BOUND) | |
1996 | goto out; | |
1997 | bh_lock_sock(sk); | |
1998 | iucv->msglimit_peer = trans_hdr->window; | |
1999 | sk->sk_state = IUCV_CONNECTED; | |
2000 | sk->sk_state_change(sk); | |
2001 | bh_unlock_sock(sk); | |
2002 | out: | |
2003 | kfree_skb(skb); | |
2004 | return NET_RX_SUCCESS; | |
2005 | } | |
2006 | ||
2007 | /** | |
2008 | * afiucv_hs_callback_synfin() - react on received SYN_FIN | |
2009 | **/ | |
2010 | static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) | |
2011 | { | |
2012 | struct iucv_sock *iucv = iucv_sk(sk); | |
2013 | ||
2014 | if (!iucv) | |
2015 | goto out; | |
2016 | if (sk->sk_state != IUCV_BOUND) | |
2017 | goto out; | |
2018 | bh_lock_sock(sk); | |
2019 | sk->sk_state = IUCV_DISCONN; | |
2020 | sk->sk_state_change(sk); | |
2021 | bh_unlock_sock(sk); | |
2022 | out: | |
2023 | kfree_skb(skb); | |
2024 | return NET_RX_SUCCESS; | |
2025 | } | |
2026 | ||
2027 | /** | |
2028 | * afiucv_hs_callback_fin() - react on received FIN | |
2029 | **/ | |
2030 | static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) | |
2031 | { | |
2032 | struct iucv_sock *iucv = iucv_sk(sk); | |
2033 | ||
2034 | /* other end of connection closed */ | |
800c5eb7 UB |
2035 | if (!iucv) |
2036 | goto out; | |
2037 | bh_lock_sock(sk); | |
2038 | if (sk->sk_state == IUCV_CONNECTED) { | |
aac6399c | 2039 | sk->sk_state = IUCV_DISCONN; |
3881ac44 | 2040 | sk->sk_state_change(sk); |
3881ac44 | 2041 | } |
800c5eb7 UB |
2042 | bh_unlock_sock(sk); |
2043 | out: | |
3881ac44 UB |
2044 | kfree_skb(skb); |
2045 | return NET_RX_SUCCESS; | |
2046 | } | |
2047 | ||
2048 | /** | |
2049 | * afiucv_hs_callback_win() - react on received WIN | |
2050 | **/ | |
2051 | static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) | |
2052 | { | |
2053 | struct iucv_sock *iucv = iucv_sk(sk); | |
2054 | struct af_iucv_trans_hdr *trans_hdr = | |
2055 | (struct af_iucv_trans_hdr *)skb->data; | |
2056 | ||
2057 | if (!iucv) | |
2058 | return NET_RX_SUCCESS; | |
2059 | ||
2060 | if (sk->sk_state != IUCV_CONNECTED) | |
2061 | return NET_RX_SUCCESS; | |
2062 | ||
2063 | atomic_sub(trans_hdr->window, &iucv->msg_sent); | |
2064 | iucv_sock_wake_msglim(sk); | |
2065 | return NET_RX_SUCCESS; | |
2066 | } | |
2067 | ||
2068 | /** | |
2069 | * afiucv_hs_callback_rx() - react on received data | |
2070 | **/ | |
2071 | static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) | |
2072 | { | |
2073 | struct iucv_sock *iucv = iucv_sk(sk); | |
2074 | ||
2075 | if (!iucv) { | |
2076 | kfree_skb(skb); | |
2077 | return NET_RX_SUCCESS; | |
2078 | } | |
2079 | ||
2080 | if (sk->sk_state != IUCV_CONNECTED) { | |
2081 | kfree_skb(skb); | |
2082 | return NET_RX_SUCCESS; | |
2083 | } | |
2084 | ||
82492a35 UB |
2085 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
2086 | kfree_skb(skb); | |
2087 | return NET_RX_SUCCESS; | |
2088 | } | |
2089 | ||
3881ac44 | 2090 | /* write stuff from iucv_msg to skb cb */ |
82492a35 | 2091 | if (skb->len < sizeof(struct af_iucv_trans_hdr)) { |
3881ac44 UB |
2092 | kfree_skb(skb); |
2093 | return NET_RX_SUCCESS; | |
2094 | } | |
2095 | skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); | |
2096 | skb_reset_transport_header(skb); | |
2097 | skb_reset_network_header(skb); | |
f9c41a62 | 2098 | IUCV_SKB_CB(skb)->offset = 0; |
3881ac44 UB |
2099 | spin_lock(&iucv->message_q.lock); |
2100 | if (skb_queue_empty(&iucv->backlog_skb_q)) { | |
2101 | if (sock_queue_rcv_skb(sk, skb)) { | |
2102 | /* handle rcv queue full */ | |
2103 | skb_queue_tail(&iucv->backlog_skb_q, skb); | |
2104 | } | |
2105 | } else | |
2106 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
2107 | spin_unlock(&iucv->message_q.lock); | |
2108 | return NET_RX_SUCCESS; | |
2109 | } | |
2110 | ||
2111 | /** | |
2112 | * afiucv_hs_rcv() - base function for arriving data through HiperSockets | |
2113 | * transport | |
2114 | * called from netif RX softirq | |
2115 | **/ | |
2116 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, | |
2117 | struct packet_type *pt, struct net_device *orig_dev) | |
2118 | { | |
3881ac44 UB |
2119 | struct sock *sk; |
2120 | struct iucv_sock *iucv; | |
2121 | struct af_iucv_trans_hdr *trans_hdr; | |
2122 | char nullstring[8]; | |
2123 | int err = 0; | |
2124 | ||
2125 | skb_pull(skb, ETH_HLEN); | |
2126 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
2127 | EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
2128 | EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
2129 | EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
2130 | EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
2131 | memset(nullstring, 0, sizeof(nullstring)); | |
2132 | iucv = NULL; | |
2133 | sk = NULL; | |
2134 | read_lock(&iucv_sk_list.lock); | |
b67bfe0d | 2135 | sk_for_each(sk, &iucv_sk_list.head) { |
3881ac44 UB |
2136 | if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { |
2137 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2138 | trans_hdr->destAppName, 8)) && | |
2139 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2140 | trans_hdr->destUserID, 8)) && | |
2141 | (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && | |
2142 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2143 | nullstring, 8))) { | |
2144 | iucv = iucv_sk(sk); | |
2145 | break; | |
2146 | } | |
2147 | } else { | |
2148 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2149 | trans_hdr->destAppName, 8)) && | |
2150 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2151 | trans_hdr->destUserID, 8)) && | |
2152 | (!memcmp(&iucv_sk(sk)->dst_name, | |
2153 | trans_hdr->srcAppName, 8)) && | |
2154 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2155 | trans_hdr->srcUserID, 8))) { | |
2156 | iucv = iucv_sk(sk); | |
2157 | break; | |
2158 | } | |
2159 | } | |
2160 | } | |
2161 | read_unlock(&iucv_sk_list.lock); | |
2162 | if (!iucv) | |
2163 | sk = NULL; | |
2164 | ||
2165 | /* no sock | |
2166 | how should we send with no sock | |
2167 | 1) send without sock no send rc checking? | |
2168 | 2) introduce default sock to handle this cases | |
2169 | ||
2170 | SYN -> send SYN|ACK in good case, send SYN|FIN in bad case | |
2171 | data -> send FIN | |
2172 | SYN|ACK, SYN|FIN, FIN -> no action? */ | |
2173 | ||
2174 | switch (trans_hdr->flags) { | |
2175 | case AF_IUCV_FLAG_SYN: | |
2176 | /* connect request */ | |
2177 | err = afiucv_hs_callback_syn(sk, skb); | |
2178 | break; | |
2179 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): | |
2180 | /* connect request confirmed */ | |
2181 | err = afiucv_hs_callback_synack(sk, skb); | |
2182 | break; | |
2183 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): | |
2184 | /* connect request refused */ | |
2185 | err = afiucv_hs_callback_synfin(sk, skb); | |
2186 | break; | |
2187 | case (AF_IUCV_FLAG_FIN): | |
2188 | /* close request */ | |
2189 | err = afiucv_hs_callback_fin(sk, skb); | |
2190 | break; | |
2191 | case (AF_IUCV_FLAG_WIN): | |
2192 | err = afiucv_hs_callback_win(sk, skb); | |
800c5eb7 UB |
2193 | if (skb->len == sizeof(struct af_iucv_trans_hdr)) { |
2194 | kfree_skb(skb); | |
2195 | break; | |
2196 | } | |
82492a35 UB |
2197 | /* fall through and receive non-zero length data */ |
2198 | case (AF_IUCV_FLAG_SHT): | |
2199 | /* shutdown request */ | |
2200 | /* fall through and receive zero length data */ | |
3881ac44 UB |
2201 | case 0: |
2202 | /* plain data frame */ | |
f9c41a62 | 2203 | IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; |
3881ac44 UB |
2204 | err = afiucv_hs_callback_rx(sk, skb); |
2205 | break; | |
2206 | default: | |
2207 | ; | |
2208 | } | |
2209 | ||
2210 | return err; | |
2211 | } | |
2212 | ||
2213 | /** | |
2214 | * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets | |
2215 | * transport | |
2216 | **/ | |
2217 | static void afiucv_hs_callback_txnotify(struct sk_buff *skb, | |
2218 | enum iucv_tx_notify n) | |
2219 | { | |
2220 | struct sock *isk = skb->sk; | |
2221 | struct sock *sk = NULL; | |
2222 | struct iucv_sock *iucv = NULL; | |
2223 | struct sk_buff_head *list; | |
2224 | struct sk_buff *list_skb; | |
800c5eb7 | 2225 | struct sk_buff *nskb; |
3881ac44 | 2226 | unsigned long flags; |
3881ac44 | 2227 | |
800c5eb7 | 2228 | read_lock_irqsave(&iucv_sk_list.lock, flags); |
b67bfe0d | 2229 | sk_for_each(sk, &iucv_sk_list.head) |
3881ac44 UB |
2230 | if (sk == isk) { |
2231 | iucv = iucv_sk(sk); | |
2232 | break; | |
2233 | } | |
800c5eb7 | 2234 | read_unlock_irqrestore(&iucv_sk_list.lock, flags); |
3881ac44 | 2235 | |
800c5eb7 | 2236 | if (!iucv || sock_flag(sk, SOCK_ZAPPED)) |
3881ac44 UB |
2237 | return; |
2238 | ||
3881ac44 | 2239 | list = &iucv->send_skb_q; |
800c5eb7 | 2240 | spin_lock_irqsave(&list->lock, flags); |
3881ac44 UB |
2241 | if (skb_queue_empty(list)) |
2242 | goto out_unlock; | |
800c5eb7 UB |
2243 | list_skb = list->next; |
2244 | nskb = list_skb->next; | |
3881ac44 UB |
2245 | while (list_skb != (struct sk_buff *)list) { |
2246 | if (skb_shinfo(list_skb) == skb_shinfo(skb)) { | |
3881ac44 UB |
2247 | switch (n) { |
2248 | case TX_NOTIFY_OK: | |
800c5eb7 UB |
2249 | __skb_unlink(list_skb, list); |
2250 | kfree_skb(list_skb); | |
3881ac44 | 2251 | iucv_sock_wake_msglim(sk); |
3881ac44 UB |
2252 | break; |
2253 | case TX_NOTIFY_PENDING: | |
2254 | atomic_inc(&iucv->pendings); | |
2255 | break; | |
2256 | case TX_NOTIFY_DELAYED_OK: | |
800c5eb7 | 2257 | __skb_unlink(list_skb, list); |
3881ac44 UB |
2258 | atomic_dec(&iucv->pendings); |
2259 | if (atomic_read(&iucv->pendings) <= 0) | |
2260 | iucv_sock_wake_msglim(sk); | |
800c5eb7 | 2261 | kfree_skb(list_skb); |
3881ac44 UB |
2262 | break; |
2263 | case TX_NOTIFY_UNREACHABLE: | |
2264 | case TX_NOTIFY_DELAYED_UNREACHABLE: | |
2265 | case TX_NOTIFY_TPQFULL: /* not yet used */ | |
2266 | case TX_NOTIFY_GENERALERROR: | |
2267 | case TX_NOTIFY_DELAYED_GENERALERROR: | |
800c5eb7 UB |
2268 | __skb_unlink(list_skb, list); |
2269 | kfree_skb(list_skb); | |
2270 | if (sk->sk_state == IUCV_CONNECTED) { | |
2271 | sk->sk_state = IUCV_DISCONN; | |
2272 | sk->sk_state_change(sk); | |
2273 | } | |
3881ac44 UB |
2274 | break; |
2275 | } | |
2276 | break; | |
2277 | } | |
800c5eb7 UB |
2278 | list_skb = nskb; |
2279 | nskb = nskb->next; | |
3881ac44 | 2280 | } |
800c5eb7 | 2281 | out_unlock: |
3881ac44 UB |
2282 | spin_unlock_irqrestore(&list->lock, flags); |
2283 | ||
42bd48e0 UB |
2284 | if (sk->sk_state == IUCV_CLOSING) { |
2285 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { | |
2286 | sk->sk_state = IUCV_CLOSED; | |
2287 | sk->sk_state_change(sk); | |
2288 | } | |
2289 | } | |
2290 | ||
3881ac44 | 2291 | } |
9fbd87d4 UB |
2292 | |
2293 | /* | |
2294 | * afiucv_netdev_event: handle netdev notifier chain events | |
2295 | */ | |
2296 | static int afiucv_netdev_event(struct notifier_block *this, | |
2297 | unsigned long event, void *ptr) | |
2298 | { | |
351638e7 | 2299 | struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); |
9fbd87d4 UB |
2300 | struct sock *sk; |
2301 | struct iucv_sock *iucv; | |
2302 | ||
2303 | switch (event) { | |
2304 | case NETDEV_REBOOT: | |
2305 | case NETDEV_GOING_DOWN: | |
b67bfe0d | 2306 | sk_for_each(sk, &iucv_sk_list.head) { |
9fbd87d4 UB |
2307 | iucv = iucv_sk(sk); |
2308 | if ((iucv->hs_dev == event_dev) && | |
2309 | (sk->sk_state == IUCV_CONNECTED)) { | |
2310 | if (event == NETDEV_GOING_DOWN) | |
2311 | iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); | |
2312 | sk->sk_state = IUCV_DISCONN; | |
2313 | sk->sk_state_change(sk); | |
2314 | } | |
2315 | } | |
2316 | break; | |
2317 | case NETDEV_DOWN: | |
2318 | case NETDEV_UNREGISTER: | |
2319 | default: | |
2320 | break; | |
2321 | } | |
2322 | return NOTIFY_DONE; | |
2323 | } | |
2324 | ||
2325 | static struct notifier_block afiucv_netdev_notifier = { | |
2326 | .notifier_call = afiucv_netdev_event, | |
2327 | }; | |
2328 | ||
5708e868 | 2329 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
2330 | .family = PF_IUCV, |
2331 | .owner = THIS_MODULE, | |
2332 | .release = iucv_sock_release, | |
2333 | .bind = iucv_sock_bind, | |
2334 | .connect = iucv_sock_connect, | |
2335 | .listen = iucv_sock_listen, | |
2336 | .accept = iucv_sock_accept, | |
2337 | .getname = iucv_sock_getname, | |
2338 | .sendmsg = iucv_sock_sendmsg, | |
2339 | .recvmsg = iucv_sock_recvmsg, | |
2340 | .poll = iucv_sock_poll, | |
2341 | .ioctl = sock_no_ioctl, | |
2342 | .mmap = sock_no_mmap, | |
2343 | .socketpair = sock_no_socketpair, | |
2344 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
2345 | .setsockopt = iucv_sock_setsockopt, |
2346 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
2347 | }; |
2348 | ||
ec1b4cf7 | 2349 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
2350 | .family = AF_IUCV, |
2351 | .owner = THIS_MODULE, | |
2352 | .create = iucv_sock_create, | |
2353 | }; | |
2354 | ||
3881ac44 UB |
2355 | static struct packet_type iucv_packet_type = { |
2356 | .type = cpu_to_be16(ETH_P_AF_IUCV), | |
2357 | .func = afiucv_hs_rcv, | |
2358 | }; | |
2359 | ||
2360 | static int afiucv_iucv_init(void) | |
6fcd61f7 FB |
2361 | { |
2362 | int err; | |
2363 | ||
2364 | err = pr_iucv->iucv_register(&af_iucv_handler, 0); | |
2365 | if (err) | |
2366 | goto out; | |
2367 | /* establish dummy device */ | |
2368 | af_iucv_driver.bus = pr_iucv->bus; | |
2369 | err = driver_register(&af_iucv_driver); | |
2370 | if (err) | |
2371 | goto out_iucv; | |
2372 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
2373 | if (!af_iucv_dev) { | |
2374 | err = -ENOMEM; | |
2375 | goto out_driver; | |
2376 | } | |
2377 | dev_set_name(af_iucv_dev, "af_iucv"); | |
2378 | af_iucv_dev->bus = pr_iucv->bus; | |
2379 | af_iucv_dev->parent = pr_iucv->root; | |
2380 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
2381 | af_iucv_dev->driver = &af_iucv_driver; | |
2382 | err = device_register(af_iucv_dev); | |
2383 | if (err) | |
2384 | goto out_driver; | |
2385 | return 0; | |
2386 | ||
2387 | out_driver: | |
2388 | driver_unregister(&af_iucv_driver); | |
2389 | out_iucv: | |
2390 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2391 | out: | |
2392 | return err; | |
2393 | } | |
2394 | ||
da99f056 | 2395 | static int __init afiucv_init(void) |
eac3731b JH |
2396 | { |
2397 | int err; | |
2398 | ||
3881ac44 UB |
2399 | if (MACHINE_IS_VM) { |
2400 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
2401 | if (unlikely(err)) { | |
2402 | WARN_ON(err); | |
2403 | err = -EPROTONOSUPPORT; | |
2404 | goto out; | |
2405 | } | |
eac3731b | 2406 | |
3881ac44 UB |
2407 | pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); |
2408 | if (!pr_iucv) { | |
2409 | printk(KERN_WARNING "iucv_if lookup failed\n"); | |
2410 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2411 | } | |
2412 | } else { | |
2413 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2414 | pr_iucv = NULL; | |
6fcd61f7 FB |
2415 | } |
2416 | ||
eac3731b JH |
2417 | err = proto_register(&iucv_proto, 0); |
2418 | if (err) | |
6fcd61f7 | 2419 | goto out; |
eac3731b JH |
2420 | err = sock_register(&iucv_sock_family_ops); |
2421 | if (err) | |
2422 | goto out_proto; | |
6fcd61f7 | 2423 | |
3881ac44 UB |
2424 | if (pr_iucv) { |
2425 | err = afiucv_iucv_init(); | |
2426 | if (err) | |
2427 | goto out_sock; | |
9fbd87d4 UB |
2428 | } else |
2429 | register_netdevice_notifier(&afiucv_netdev_notifier); | |
3881ac44 | 2430 | dev_add_pack(&iucv_packet_type); |
eac3731b JH |
2431 | return 0; |
2432 | ||
c23cad92 UB |
2433 | out_sock: |
2434 | sock_unregister(PF_IUCV); | |
eac3731b JH |
2435 | out_proto: |
2436 | proto_unregister(&iucv_proto); | |
eac3731b | 2437 | out: |
6fcd61f7 FB |
2438 | if (pr_iucv) |
2439 | symbol_put(iucv_if); | |
eac3731b JH |
2440 | return err; |
2441 | } | |
2442 | ||
2443 | static void __exit afiucv_exit(void) | |
2444 | { | |
3881ac44 UB |
2445 | if (pr_iucv) { |
2446 | device_unregister(af_iucv_dev); | |
2447 | driver_unregister(&af_iucv_driver); | |
2448 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2449 | symbol_put(iucv_if); | |
9fbd87d4 UB |
2450 | } else |
2451 | unregister_netdevice_notifier(&afiucv_netdev_notifier); | |
3881ac44 | 2452 | dev_remove_pack(&iucv_packet_type); |
eac3731b JH |
2453 | sock_unregister(PF_IUCV); |
2454 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2455 | } |
2456 | ||
2457 | module_init(afiucv_init); | |
2458 | module_exit(afiucv_exit); | |
2459 | ||
2460 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
2461 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
2462 | MODULE_VERSION(VERSION); | |
2463 | MODULE_LICENSE("GPL"); | |
2464 | MODULE_ALIAS_NETPROTO(PF_IUCV); | |
3881ac44 | 2465 |