Commit | Line | Data |
---|---|---|
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 | ||
52 | /* macros to set/get socket control buffer at correct offset */ | |
53 | #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */ | |
54 | #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag)) | |
55 | #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ | |
56 | #define CB_TRGCLS_LEN (TRGCLS_SIZE) | |
57 | ||
0ea920d2 HB |
58 | #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
59 | do { \ | |
60 | DEFINE_WAIT(__wait); \ | |
61 | long __timeo = timeo; \ | |
62 | ret = 0; \ | |
aa395145 | 63 | prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
0ea920d2 | 64 | while (!(condition)) { \ |
0ea920d2 HB |
65 | if (!__timeo) { \ |
66 | ret = -EAGAIN; \ | |
67 | break; \ | |
68 | } \ | |
69 | if (signal_pending(current)) { \ | |
70 | ret = sock_intr_errno(__timeo); \ | |
71 | break; \ | |
72 | } \ | |
73 | release_sock(sk); \ | |
74 | __timeo = schedule_timeout(__timeo); \ | |
75 | lock_sock(sk); \ | |
76 | ret = sock_error(sk); \ | |
77 | if (ret) \ | |
78 | break; \ | |
79 | } \ | |
aa395145 | 80 | finish_wait(sk_sleep(sk), &__wait); \ |
0ea920d2 HB |
81 | } while (0) |
82 | ||
83 | #define iucv_sock_wait(sk, condition, timeo) \ | |
84 | ({ \ | |
85 | int __ret = 0; \ | |
86 | if (!(condition)) \ | |
87 | __iucv_sock_wait(sk, condition, timeo, __ret); \ | |
88 | __ret; \ | |
89 | }) | |
44b1e6b5 | 90 | |
57f20448 HC |
91 | static void iucv_sock_kill(struct sock *sk); |
92 | static void iucv_sock_close(struct sock *sk); | |
7d316b94 | 93 | static void iucv_sever_path(struct sock *, int); |
57f20448 | 94 | |
3881ac44 UB |
95 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, |
96 | struct packet_type *pt, struct net_device *orig_dev); | |
97 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
98 | struct sk_buff *skb, u8 flags); | |
99 | static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); | |
100 | ||
eac3731b JH |
101 | /* Call Back functions */ |
102 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
103 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
104 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
105 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
106 | u8 ipuser[16]); | |
eac3731b | 107 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 108 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
109 | |
110 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 111 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
112 | .autobind_name = ATOMIC_INIT(0) |
113 | }; | |
114 | ||
115 | static struct iucv_handler af_iucv_handler = { | |
116 | .path_pending = iucv_callback_connreq, | |
117 | .path_complete = iucv_callback_connack, | |
118 | .path_severed = iucv_callback_connrej, | |
119 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
120 | .message_complete = iucv_callback_txdone, |
121 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
122 | }; |
123 | ||
124 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
125 | { | |
126 | memcpy(dst, src, 8); | |
127 | } | |
128 | ||
129 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
130 | { | |
131 | memcpy(&dst[8], src, 8); | |
132 | } | |
133 | ||
c23cad92 UB |
134 | static int afiucv_pm_prepare(struct device *dev) |
135 | { | |
136 | #ifdef CONFIG_PM_DEBUG | |
137 | printk(KERN_WARNING "afiucv_pm_prepare\n"); | |
138 | #endif | |
139 | return 0; | |
140 | } | |
141 | ||
142 | static void afiucv_pm_complete(struct device *dev) | |
143 | { | |
144 | #ifdef CONFIG_PM_DEBUG | |
145 | printk(KERN_WARNING "afiucv_pm_complete\n"); | |
146 | #endif | |
c23cad92 UB |
147 | } |
148 | ||
149 | /** | |
150 | * afiucv_pm_freeze() - Freeze PM callback | |
151 | * @dev: AFIUCV dummy device | |
152 | * | |
153 | * Sever all established IUCV communication pathes | |
154 | */ | |
155 | static int afiucv_pm_freeze(struct device *dev) | |
156 | { | |
157 | struct iucv_sock *iucv; | |
158 | struct sock *sk; | |
159 | struct hlist_node *node; | |
160 | int err = 0; | |
161 | ||
162 | #ifdef CONFIG_PM_DEBUG | |
163 | printk(KERN_WARNING "afiucv_pm_freeze\n"); | |
164 | #endif | |
165 | read_lock(&iucv_sk_list.lock); | |
166 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
167 | iucv = iucv_sk(sk); | |
c23cad92 | 168 | switch (sk->sk_state) { |
c23cad92 UB |
169 | case IUCV_DISCONN: |
170 | case IUCV_CLOSING: | |
171 | case IUCV_CONNECTED: | |
7d316b94 | 172 | iucv_sever_path(sk, 0); |
c23cad92 UB |
173 | break; |
174 | case IUCV_OPEN: | |
175 | case IUCV_BOUND: | |
176 | case IUCV_LISTEN: | |
177 | case IUCV_CLOSED: | |
178 | default: | |
179 | break; | |
180 | } | |
7d316b94 UB |
181 | skb_queue_purge(&iucv->send_skb_q); |
182 | skb_queue_purge(&iucv->backlog_skb_q); | |
c23cad92 UB |
183 | } |
184 | read_unlock(&iucv_sk_list.lock); | |
185 | return err; | |
186 | } | |
187 | ||
188 | /** | |
189 | * afiucv_pm_restore_thaw() - Thaw and restore PM callback | |
190 | * @dev: AFIUCV dummy device | |
191 | * | |
192 | * socket clean up after freeze | |
193 | */ | |
194 | static int afiucv_pm_restore_thaw(struct device *dev) | |
195 | { | |
c23cad92 UB |
196 | struct sock *sk; |
197 | struct hlist_node *node; | |
198 | ||
199 | #ifdef CONFIG_PM_DEBUG | |
200 | printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); | |
201 | #endif | |
202 | read_lock(&iucv_sk_list.lock); | |
203 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
c23cad92 UB |
204 | switch (sk->sk_state) { |
205 | case IUCV_CONNECTED: | |
206 | sk->sk_err = EPIPE; | |
207 | sk->sk_state = IUCV_DISCONN; | |
208 | sk->sk_state_change(sk); | |
209 | break; | |
210 | case IUCV_DISCONN: | |
c23cad92 UB |
211 | case IUCV_CLOSING: |
212 | case IUCV_LISTEN: | |
213 | case IUCV_BOUND: | |
214 | case IUCV_OPEN: | |
215 | default: | |
216 | break; | |
217 | } | |
218 | } | |
219 | read_unlock(&iucv_sk_list.lock); | |
220 | return 0; | |
221 | } | |
222 | ||
47145210 | 223 | static const struct dev_pm_ops afiucv_pm_ops = { |
c23cad92 UB |
224 | .prepare = afiucv_pm_prepare, |
225 | .complete = afiucv_pm_complete, | |
226 | .freeze = afiucv_pm_freeze, | |
227 | .thaw = afiucv_pm_restore_thaw, | |
228 | .restore = afiucv_pm_restore_thaw, | |
229 | }; | |
230 | ||
231 | static struct device_driver af_iucv_driver = { | |
232 | .owner = THIS_MODULE, | |
233 | .name = "afiucv", | |
6fcd61f7 | 234 | .bus = NULL, |
c23cad92 UB |
235 | .pm = &afiucv_pm_ops, |
236 | }; | |
237 | ||
238 | /* dummy device used as trigger for PM functions */ | |
239 | static struct device *af_iucv_dev; | |
240 | ||
b8942e3b HB |
241 | /** |
242 | * iucv_msg_length() - Returns the length of an iucv message. | |
243 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
244 | * | |
245 | * The function returns the length of the specified iucv message @msg of data | |
246 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
247 | * | |
248 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
249 | * data: | |
250 | * PRMDATA[0..6] socket data (max 7 bytes); | |
251 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
252 | * | |
25985edc | 253 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
254 | * value from 0xFF. |
255 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
256 | * notifications (see iucv_sock_shutdown); and further, | |
257 | * if the socket data len is > 7, the function returns 8. | |
258 | * | |
259 | * Use this function to allocate socket buffers to store iucv message data. | |
260 | */ | |
261 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
262 | { | |
263 | size_t datalen; | |
264 | ||
265 | if (msg->flags & IUCV_IPRMDATA) { | |
266 | datalen = 0xff - msg->rmmsg[7]; | |
267 | return (datalen < 8) ? datalen : 8; | |
268 | } | |
269 | return msg->length; | |
270 | } | |
271 | ||
0ea920d2 HB |
272 | /** |
273 | * iucv_sock_in_state() - check for specific states | |
274 | * @sk: sock structure | |
275 | * @state: first iucv sk state | |
276 | * @state: second iucv sk state | |
277 | * | |
278 | * Returns true if the socket in either in the first or second state. | |
279 | */ | |
280 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
281 | { | |
282 | return (sk->sk_state == state || sk->sk_state == state2); | |
283 | } | |
284 | ||
285 | /** | |
286 | * iucv_below_msglim() - function to check if messages can be sent | |
287 | * @sk: sock structure | |
288 | * | |
289 | * Returns true if the send queue length is lower than the message limit. | |
290 | * Always returns true if the socket is not connected (no iucv path for | |
291 | * checking the message limit). | |
292 | */ | |
293 | static inline int iucv_below_msglim(struct sock *sk) | |
294 | { | |
295 | struct iucv_sock *iucv = iucv_sk(sk); | |
296 | ||
297 | if (sk->sk_state != IUCV_CONNECTED) | |
298 | return 1; | |
3881ac44 UB |
299 | if (iucv->transport == AF_IUCV_TRANS_IUCV) |
300 | return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); | |
301 | else | |
302 | return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && | |
303 | (atomic_read(&iucv->pendings) <= 0)); | |
0ea920d2 HB |
304 | } |
305 | ||
306 | /** | |
307 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
308 | */ | |
309 | static void iucv_sock_wake_msglim(struct sock *sk) | |
310 | { | |
43815482 ED |
311 | struct socket_wq *wq; |
312 | ||
313 | rcu_read_lock(); | |
314 | wq = rcu_dereference(sk->sk_wq); | |
315 | if (wq_has_sleeper(wq)) | |
316 | wake_up_interruptible_all(&wq->wait); | |
0ea920d2 | 317 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 318 | rcu_read_unlock(); |
0ea920d2 HB |
319 | } |
320 | ||
3881ac44 UB |
321 | /** |
322 | * afiucv_hs_send() - send a message through HiperSockets transport | |
323 | */ | |
324 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
325 | struct sk_buff *skb, u8 flags) | |
326 | { | |
3881ac44 UB |
327 | struct iucv_sock *iucv = iucv_sk(sock); |
328 | struct af_iucv_trans_hdr *phs_hdr; | |
329 | struct sk_buff *nskb; | |
330 | int err, confirm_recv = 0; | |
331 | ||
332 | memset(skb->head, 0, ETH_HLEN); | |
333 | phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, | |
334 | sizeof(struct af_iucv_trans_hdr)); | |
335 | skb_reset_mac_header(skb); | |
336 | skb_reset_network_header(skb); | |
337 | skb_push(skb, ETH_HLEN); | |
338 | skb_reset_mac_header(skb); | |
339 | memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); | |
340 | ||
341 | phs_hdr->magic = ETH_P_AF_IUCV; | |
342 | phs_hdr->version = 1; | |
343 | phs_hdr->flags = flags; | |
344 | if (flags == AF_IUCV_FLAG_SYN) | |
345 | phs_hdr->window = iucv->msglimit; | |
346 | else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { | |
347 | confirm_recv = atomic_read(&iucv->msg_recv); | |
348 | phs_hdr->window = confirm_recv; | |
349 | if (confirm_recv) | |
350 | phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; | |
351 | } | |
352 | memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); | |
353 | memcpy(phs_hdr->destAppName, iucv->dst_name, 8); | |
354 | memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); | |
355 | memcpy(phs_hdr->srcAppName, iucv->src_name, 8); | |
356 | ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); | |
357 | ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); | |
358 | ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); | |
359 | ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); | |
360 | if (imsg) | |
361 | memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); | |
362 | ||
800c5eb7 | 363 | skb->dev = iucv->hs_dev; |
3881ac44 UB |
364 | if (!skb->dev) |
365 | return -ENODEV; | |
800c5eb7 | 366 | if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) |
3881ac44 UB |
367 | return -ENETDOWN; |
368 | if (skb->len > skb->dev->mtu) { | |
369 | if (sock->sk_type == SOCK_SEQPACKET) | |
370 | return -EMSGSIZE; | |
371 | else | |
372 | skb_trim(skb, skb->dev->mtu); | |
373 | } | |
374 | skb->protocol = ETH_P_AF_IUCV; | |
3881ac44 UB |
375 | nskb = skb_clone(skb, GFP_ATOMIC); |
376 | if (!nskb) | |
377 | return -ENOMEM; | |
378 | skb_queue_tail(&iucv->send_skb_q, nskb); | |
379 | err = dev_queue_xmit(skb); | |
800c5eb7 | 380 | if (net_xmit_eval(err)) { |
3881ac44 UB |
381 | skb_unlink(nskb, &iucv->send_skb_q); |
382 | kfree_skb(nskb); | |
383 | } else { | |
384 | atomic_sub(confirm_recv, &iucv->msg_recv); | |
385 | WARN_ON(atomic_read(&iucv->msg_recv) < 0); | |
386 | } | |
800c5eb7 | 387 | return net_xmit_eval(err); |
3881ac44 UB |
388 | } |
389 | ||
eac3731b JH |
390 | static struct sock *__iucv_get_sock_by_name(char *nm) |
391 | { | |
392 | struct sock *sk; | |
393 | struct hlist_node *node; | |
394 | ||
395 | sk_for_each(sk, node, &iucv_sk_list.head) | |
396 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
397 | return sk; | |
398 | ||
399 | return NULL; | |
400 | } | |
401 | ||
402 | static void iucv_sock_destruct(struct sock *sk) | |
403 | { | |
404 | skb_queue_purge(&sk->sk_receive_queue); | |
82492a35 UB |
405 | skb_queue_purge(&sk->sk_error_queue); |
406 | ||
407 | sk_mem_reclaim(sk); | |
408 | ||
409 | if (!sock_flag(sk, SOCK_DEAD)) { | |
410 | pr_err("Attempt to release alive iucv socket %p\n", sk); | |
411 | return; | |
412 | } | |
413 | ||
414 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); | |
415 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
416 | WARN_ON(sk->sk_wmem_queued); | |
417 | WARN_ON(sk->sk_forward_alloc); | |
eac3731b JH |
418 | } |
419 | ||
420 | /* Cleanup Listen */ | |
421 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
422 | { | |
423 | struct sock *sk; | |
424 | ||
425 | /* Close non-accepted connections */ | |
426 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
427 | iucv_sock_close(sk); | |
428 | iucv_sock_kill(sk); | |
429 | } | |
430 | ||
431 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
432 | } |
433 | ||
7514bab0 | 434 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
435 | static void iucv_sock_kill(struct sock *sk) |
436 | { | |
437 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
438 | return; | |
439 | ||
440 | iucv_sock_unlink(&iucv_sk_list, sk); | |
441 | sock_set_flag(sk, SOCK_DEAD); | |
442 | sock_put(sk); | |
443 | } | |
444 | ||
7d316b94 UB |
445 | /* Terminate an IUCV path */ |
446 | static void iucv_sever_path(struct sock *sk, int with_user_data) | |
447 | { | |
448 | unsigned char user_data[16]; | |
449 | struct iucv_sock *iucv = iucv_sk(sk); | |
450 | struct iucv_path *path = iucv->path; | |
451 | ||
452 | if (iucv->path) { | |
453 | iucv->path = NULL; | |
454 | if (with_user_data) { | |
455 | low_nmcpy(user_data, iucv->src_name); | |
456 | high_nmcpy(user_data, iucv->dst_name); | |
457 | ASCEBC(user_data, sizeof(user_data)); | |
458 | pr_iucv->path_sever(path, user_data); | |
459 | } else | |
460 | pr_iucv->path_sever(path, NULL); | |
461 | iucv_path_free(path); | |
462 | } | |
463 | } | |
464 | ||
9fbd87d4 UB |
465 | /* Send FIN through an IUCV socket for HIPER transport */ |
466 | static int iucv_send_ctrl(struct sock *sk, u8 flags) | |
467 | { | |
468 | int err = 0; | |
469 | int blen; | |
470 | struct sk_buff *skb; | |
471 | ||
472 | blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
473 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
474 | if (skb) { | |
475 | skb_reserve(skb, blen); | |
476 | err = afiucv_hs_send(NULL, sk, skb, flags); | |
477 | } | |
478 | return err; | |
479 | } | |
480 | ||
eac3731b JH |
481 | /* Close an IUCV socket */ |
482 | static void iucv_sock_close(struct sock *sk) | |
483 | { | |
eac3731b | 484 | struct iucv_sock *iucv = iucv_sk(sk); |
561e0360 | 485 | unsigned long timeo; |
800c5eb7 | 486 | int err = 0; |
eac3731b | 487 | |
eac3731b JH |
488 | lock_sock(sk); |
489 | ||
da99f056 | 490 | switch (sk->sk_state) { |
eac3731b JH |
491 | case IUCV_LISTEN: |
492 | iucv_sock_cleanup_listen(sk); | |
493 | break; | |
494 | ||
495 | case IUCV_CONNECTED: | |
3881ac44 | 496 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
9fbd87d4 | 497 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); |
3881ac44 UB |
498 | sk->sk_state = IUCV_DISCONN; |
499 | sk->sk_state_change(sk); | |
500 | } | |
816abbad | 501 | case IUCV_DISCONN: /* fall through */ |
561e0360 JH |
502 | sk->sk_state = IUCV_CLOSING; |
503 | sk->sk_state_change(sk); | |
504 | ||
800c5eb7 | 505 | if (!err && !skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
506 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
507 | timeo = sk->sk_lingertime; | |
508 | else | |
509 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 510 | iucv_sock_wait(sk, |
0ea920d2 HB |
511 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
512 | timeo); | |
561e0360 JH |
513 | } |
514 | ||
bbe188c8 | 515 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
516 | sk->sk_state = IUCV_CLOSED; |
517 | sk->sk_state_change(sk); | |
518 | ||
eac3731b JH |
519 | sk->sk_err = ECONNRESET; |
520 | sk->sk_state_change(sk); | |
521 | ||
800c5eb7 | 522 | skb_queue_purge(&iucv->send_skb_q); |
561e0360 | 523 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b | 524 | |
7d316b94 UB |
525 | default: /* fall through */ |
526 | iucv_sever_path(sk, 1); | |
3ff50b79 | 527 | } |
eac3731b | 528 | |
800c5eb7 UB |
529 | if (iucv->hs_dev) { |
530 | dev_put(iucv->hs_dev); | |
531 | iucv->hs_dev = NULL; | |
532 | sk->sk_bound_dev_if = 0; | |
533 | } | |
534 | ||
7514bab0 HB |
535 | /* mark socket for deletion by iucv_sock_kill() */ |
536 | sock_set_flag(sk, SOCK_ZAPPED); | |
537 | ||
eac3731b | 538 | release_sock(sk); |
eac3731b JH |
539 | } |
540 | ||
541 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
542 | { | |
543 | if (parent) | |
544 | sk->sk_type = parent->sk_type; | |
545 | } | |
546 | ||
547 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
548 | { | |
549 | struct sock *sk; | |
493d3971 | 550 | struct iucv_sock *iucv; |
eac3731b | 551 | |
6257ff21 | 552 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
553 | if (!sk) |
554 | return NULL; | |
493d3971 | 555 | iucv = iucv_sk(sk); |
eac3731b JH |
556 | |
557 | sock_init_data(sock, sk); | |
493d3971 UB |
558 | INIT_LIST_HEAD(&iucv->accept_q); |
559 | spin_lock_init(&iucv->accept_q_lock); | |
560 | skb_queue_head_init(&iucv->send_skb_q); | |
561 | INIT_LIST_HEAD(&iucv->message_q.list); | |
562 | spin_lock_init(&iucv->message_q.lock); | |
563 | skb_queue_head_init(&iucv->backlog_skb_q); | |
564 | iucv->send_tag = 0; | |
3881ac44 | 565 | atomic_set(&iucv->pendings, 0); |
493d3971 | 566 | iucv->flags = 0; |
3881ac44 UB |
567 | iucv->msglimit = 0; |
568 | atomic_set(&iucv->msg_sent, 0); | |
569 | atomic_set(&iucv->msg_recv, 0); | |
493d3971 | 570 | iucv->path = NULL; |
3881ac44 | 571 | iucv->sk_txnotify = afiucv_hs_callback_txnotify; |
493d3971 | 572 | memset(&iucv->src_user_id , 0, 32); |
3881ac44 UB |
573 | if (pr_iucv) |
574 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
575 | else | |
576 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
eac3731b JH |
577 | |
578 | sk->sk_destruct = iucv_sock_destruct; | |
579 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
580 | sk->sk_allocation = GFP_DMA; | |
581 | ||
582 | sock_reset_flag(sk, SOCK_ZAPPED); | |
583 | ||
584 | sk->sk_protocol = proto; | |
585 | sk->sk_state = IUCV_OPEN; | |
586 | ||
eac3731b JH |
587 | iucv_sock_link(&iucv_sk_list, sk); |
588 | return sk; | |
589 | } | |
590 | ||
591 | /* Create an IUCV socket */ | |
3f378b68 EP |
592 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
593 | int kern) | |
eac3731b JH |
594 | { |
595 | struct sock *sk; | |
596 | ||
aa8e71f5 HB |
597 | if (protocol && protocol != PF_IUCV) |
598 | return -EPROTONOSUPPORT; | |
eac3731b JH |
599 | |
600 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
601 | |
602 | switch (sock->type) { | |
603 | case SOCK_STREAM: | |
604 | sock->ops = &iucv_sock_ops; | |
605 | break; | |
606 | case SOCK_SEQPACKET: | |
607 | /* currently, proto ops can handle both sk types */ | |
608 | sock->ops = &iucv_sock_ops; | |
609 | break; | |
610 | default: | |
611 | return -ESOCKTNOSUPPORT; | |
612 | } | |
eac3731b JH |
613 | |
614 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
615 | if (!sk) | |
616 | return -ENOMEM; | |
617 | ||
618 | iucv_sock_init(sk, NULL); | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
623 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
624 | { | |
625 | write_lock_bh(&l->lock); | |
626 | sk_add_node(sk, &l->head); | |
627 | write_unlock_bh(&l->lock); | |
628 | } | |
629 | ||
630 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
631 | { | |
632 | write_lock_bh(&l->lock); | |
633 | sk_del_node_init(sk); | |
634 | write_unlock_bh(&l->lock); | |
635 | } | |
636 | ||
637 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
638 | { | |
febca281 UB |
639 | unsigned long flags; |
640 | struct iucv_sock *par = iucv_sk(parent); | |
641 | ||
eac3731b | 642 | sock_hold(sk); |
febca281 UB |
643 | spin_lock_irqsave(&par->accept_q_lock, flags); |
644 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
645 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 646 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 647 | sk_acceptq_added(parent); |
eac3731b JH |
648 | } |
649 | ||
650 | void iucv_accept_unlink(struct sock *sk) | |
651 | { | |
febca281 UB |
652 | unsigned long flags; |
653 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
654 | ||
655 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 656 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 657 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 658 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
659 | iucv_sk(sk)->parent = NULL; |
660 | sock_put(sk); | |
661 | } | |
662 | ||
663 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
664 | { | |
665 | struct iucv_sock *isk, *n; | |
666 | struct sock *sk; | |
667 | ||
da99f056 | 668 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
669 | sk = (struct sock *) isk; |
670 | lock_sock(sk); | |
671 | ||
672 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 673 | iucv_accept_unlink(sk); |
febca281 | 674 | release_sock(sk); |
eac3731b JH |
675 | continue; |
676 | } | |
677 | ||
678 | if (sk->sk_state == IUCV_CONNECTED || | |
aac6399c | 679 | sk->sk_state == IUCV_DISCONN || |
eac3731b JH |
680 | !newsock) { |
681 | iucv_accept_unlink(sk); | |
682 | if (newsock) | |
683 | sock_graft(sk, newsock); | |
684 | ||
eac3731b JH |
685 | release_sock(sk); |
686 | return sk; | |
687 | } | |
688 | ||
689 | release_sock(sk); | |
690 | } | |
691 | return NULL; | |
692 | } | |
693 | ||
eac3731b JH |
694 | /* Bind an unbound socket */ |
695 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
696 | int addr_len) | |
697 | { | |
698 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
699 | struct sock *sk = sock->sk; | |
700 | struct iucv_sock *iucv; | |
3881ac44 UB |
701 | int err = 0; |
702 | struct net_device *dev; | |
703 | char uid[9]; | |
eac3731b JH |
704 | |
705 | /* Verify the input sockaddr */ | |
706 | if (!addr || addr->sa_family != AF_IUCV) | |
707 | return -EINVAL; | |
708 | ||
709 | lock_sock(sk); | |
710 | if (sk->sk_state != IUCV_OPEN) { | |
711 | err = -EBADFD; | |
712 | goto done; | |
713 | } | |
714 | ||
715 | write_lock_bh(&iucv_sk_list.lock); | |
716 | ||
717 | iucv = iucv_sk(sk); | |
718 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
719 | err = -EADDRINUSE; | |
720 | goto done_unlock; | |
721 | } | |
3881ac44 | 722 | if (iucv->path) |
eac3731b | 723 | goto done_unlock; |
eac3731b JH |
724 | |
725 | /* Bind the socket */ | |
3881ac44 UB |
726 | if (pr_iucv) |
727 | if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) | |
728 | goto vm_bind; /* VM IUCV transport */ | |
eac3731b | 729 | |
3881ac44 UB |
730 | /* try hiper transport */ |
731 | memcpy(uid, sa->siucv_user_id, sizeof(uid)); | |
732 | ASCEBC(uid, 8); | |
733 | rcu_read_lock(); | |
734 | for_each_netdev_rcu(&init_net, dev) { | |
735 | if (!memcmp(dev->perm_addr, uid, 8)) { | |
736 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
737 | memcpy(iucv->src_user_id, sa->siucv_user_id, 8); | |
816abbad | 738 | sk->sk_bound_dev_if = dev->ifindex; |
800c5eb7 UB |
739 | iucv->hs_dev = dev; |
740 | dev_hold(dev); | |
3881ac44 UB |
741 | sk->sk_state = IUCV_BOUND; |
742 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
743 | if (!iucv->msglimit) | |
744 | iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; | |
745 | rcu_read_unlock(); | |
746 | goto done_unlock; | |
747 | } | |
748 | } | |
749 | rcu_read_unlock(); | |
750 | vm_bind: | |
751 | if (pr_iucv) { | |
752 | /* use local userid for backward compat */ | |
753 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
754 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
755 | sk->sk_state = IUCV_BOUND; | |
756 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
757 | if (!iucv->msglimit) | |
758 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
759 | goto done_unlock; | |
760 | } | |
761 | /* found no dev to bind */ | |
762 | err = -ENODEV; | |
eac3731b JH |
763 | done_unlock: |
764 | /* Release the socket list lock */ | |
765 | write_unlock_bh(&iucv_sk_list.lock); | |
766 | done: | |
767 | release_sock(sk); | |
768 | return err; | |
769 | } | |
770 | ||
771 | /* Automatically bind an unbound socket */ | |
772 | static int iucv_sock_autobind(struct sock *sk) | |
773 | { | |
774 | struct iucv_sock *iucv = iucv_sk(sk); | |
eac3731b JH |
775 | char name[12]; |
776 | int err = 0; | |
777 | ||
aac6399c | 778 | if (unlikely(!pr_iucv)) |
eac3731b JH |
779 | return -EPROTO; |
780 | ||
aac6399c | 781 | memcpy(iucv->src_user_id, iucv_userid, 8); |
eac3731b JH |
782 | |
783 | write_lock_bh(&iucv_sk_list.lock); | |
784 | ||
785 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
786 | while (__iucv_get_sock_by_name(name)) { | |
787 | sprintf(name, "%08x", | |
788 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
789 | } | |
790 | ||
791 | write_unlock_bh(&iucv_sk_list.lock); | |
792 | ||
793 | memcpy(&iucv->src_name, name, 8); | |
794 | ||
3881ac44 UB |
795 | if (!iucv->msglimit) |
796 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
797 | ||
eac3731b JH |
798 | return err; |
799 | } | |
800 | ||
3881ac44 | 801 | static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) |
eac3731b JH |
802 | { |
803 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
804 | struct sock *sk = sock->sk; | |
493d3971 | 805 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
806 | unsigned char user_data[16]; |
807 | int err; | |
808 | ||
eac3731b | 809 | high_nmcpy(user_data, sa->siucv_name); |
493d3971 | 810 | low_nmcpy(user_data, iucv->src_name); |
eac3731b JH |
811 | ASCEBC(user_data, sizeof(user_data)); |
812 | ||
eac3731b | 813 | /* Create path. */ |
09488e2e | 814 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 815 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
816 | if (!iucv->path) { |
817 | err = -ENOMEM; | |
818 | goto done; | |
819 | } | |
6fcd61f7 FB |
820 | err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
821 | sa->siucv_user_id, NULL, user_data, | |
822 | sk); | |
eac3731b JH |
823 | if (err) { |
824 | iucv_path_free(iucv->path); | |
825 | iucv->path = NULL; | |
55cdea9e HB |
826 | switch (err) { |
827 | case 0x0b: /* Target communicator is not logged on */ | |
828 | err = -ENETUNREACH; | |
829 | break; | |
830 | case 0x0d: /* Max connections for this guest exceeded */ | |
831 | case 0x0e: /* Max connections for target guest exceeded */ | |
832 | err = -EAGAIN; | |
833 | break; | |
834 | case 0x0f: /* Missing IUCV authorization */ | |
835 | err = -EACCES; | |
836 | break; | |
837 | default: | |
838 | err = -ECONNREFUSED; | |
839 | break; | |
840 | } | |
eac3731b | 841 | } |
3881ac44 UB |
842 | done: |
843 | return err; | |
844 | } | |
eac3731b | 845 | |
3881ac44 UB |
846 | /* Connect an unconnected socket */ |
847 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
848 | int alen, int flags) | |
849 | { | |
850 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
851 | struct sock *sk = sock->sk; | |
852 | struct iucv_sock *iucv = iucv_sk(sk); | |
853 | int err; | |
854 | ||
855 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
856 | return -EINVAL; | |
857 | ||
858 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
859 | return -EBADFD; | |
860 | ||
861 | if (sk->sk_state == IUCV_OPEN && | |
862 | iucv->transport == AF_IUCV_TRANS_HIPER) | |
863 | return -EBADFD; /* explicit bind required */ | |
864 | ||
865 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) | |
866 | return -EINVAL; | |
867 | ||
868 | if (sk->sk_state == IUCV_OPEN) { | |
869 | err = iucv_sock_autobind(sk); | |
870 | if (unlikely(err)) | |
871 | return err; | |
872 | } | |
873 | ||
874 | lock_sock(sk); | |
875 | ||
876 | /* Set the destination information */ | |
877 | memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); | |
878 | memcpy(iucv->dst_name, sa->siucv_name, 8); | |
879 | ||
880 | if (iucv->transport == AF_IUCV_TRANS_HIPER) | |
9fbd87d4 | 881 | err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); |
3881ac44 UB |
882 | else |
883 | err = afiucv_path_connect(sock, addr); | |
884 | if (err) | |
885 | goto done; | |
886 | ||
887 | if (sk->sk_state != IUCV_CONNECTED) | |
0ea920d2 HB |
888 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
889 | IUCV_DISCONN), | |
890 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b | 891 | |
3881ac44 | 892 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
b8942e3b | 893 | err = -ECONNREFUSED; |
18becbc5 | 894 | |
7d316b94 UB |
895 | if (err && iucv->transport == AF_IUCV_TRANS_IUCV) |
896 | iucv_sever_path(sk, 0); | |
18becbc5 | 897 | |
eac3731b JH |
898 | done: |
899 | release_sock(sk); | |
900 | return err; | |
901 | } | |
902 | ||
903 | /* Move a socket into listening state. */ | |
904 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
905 | { | |
906 | struct sock *sk = sock->sk; | |
907 | int err; | |
908 | ||
909 | lock_sock(sk); | |
910 | ||
911 | err = -EINVAL; | |
aa8e71f5 HB |
912 | if (sk->sk_state != IUCV_BOUND) |
913 | goto done; | |
914 | ||
915 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
916 | goto done; |
917 | ||
918 | sk->sk_max_ack_backlog = backlog; | |
919 | sk->sk_ack_backlog = 0; | |
920 | sk->sk_state = IUCV_LISTEN; | |
921 | err = 0; | |
922 | ||
923 | done: | |
924 | release_sock(sk); | |
925 | return err; | |
926 | } | |
927 | ||
928 | /* Accept a pending connection */ | |
929 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
930 | int flags) | |
931 | { | |
932 | DECLARE_WAITQUEUE(wait, current); | |
933 | struct sock *sk = sock->sk, *nsk; | |
934 | long timeo; | |
935 | int err = 0; | |
936 | ||
561e0360 | 937 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
938 | |
939 | if (sk->sk_state != IUCV_LISTEN) { | |
940 | err = -EBADFD; | |
941 | goto done; | |
942 | } | |
943 | ||
944 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
945 | ||
946 | /* Wait for an incoming connection */ | |
aa395145 | 947 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 948 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
949 | set_current_state(TASK_INTERRUPTIBLE); |
950 | if (!timeo) { | |
951 | err = -EAGAIN; | |
952 | break; | |
953 | } | |
954 | ||
955 | release_sock(sk); | |
956 | timeo = schedule_timeout(timeo); | |
561e0360 | 957 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
958 | |
959 | if (sk->sk_state != IUCV_LISTEN) { | |
960 | err = -EBADFD; | |
961 | break; | |
962 | } | |
963 | ||
964 | if (signal_pending(current)) { | |
965 | err = sock_intr_errno(timeo); | |
966 | break; | |
967 | } | |
968 | } | |
969 | ||
970 | set_current_state(TASK_RUNNING); | |
aa395145 | 971 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
972 | |
973 | if (err) | |
974 | goto done; | |
975 | ||
976 | newsock->state = SS_CONNECTED; | |
977 | ||
978 | done: | |
979 | release_sock(sk); | |
980 | return err; | |
981 | } | |
982 | ||
983 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
984 | int *len, int peer) | |
985 | { | |
986 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
987 | struct sock *sk = sock->sk; | |
493d3971 | 988 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
989 | |
990 | addr->sa_family = AF_IUCV; | |
991 | *len = sizeof(struct sockaddr_iucv); | |
992 | ||
993 | if (peer) { | |
493d3971 UB |
994 | memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
995 | memcpy(siucv->siucv_name, iucv->dst_name, 8); | |
eac3731b | 996 | } else { |
493d3971 UB |
997 | memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
998 | memcpy(siucv->siucv_name, iucv->src_name, 8); | |
eac3731b JH |
999 | } |
1000 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
1001 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
493d3971 | 1002 | memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
eac3731b JH |
1003 | |
1004 | return 0; | |
1005 | } | |
1006 | ||
b8942e3b HB |
1007 | /** |
1008 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
1009 | * @path: IUCV path | |
1010 | * @msg: Pointer to a struct iucv_message | |
1011 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
1012 | * | |
1013 | * Send the socket data in the parameter list in the iucv message | |
1014 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
1015 | * list and the socket data len at index 7 (last byte). | |
1016 | * See also iucv_msg_length(). | |
1017 | * | |
1018 | * Returns the error code from the iucv_message_send() call. | |
1019 | */ | |
1020 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
1021 | struct sk_buff *skb) | |
1022 | { | |
1023 | u8 prmdata[8]; | |
1024 | ||
1025 | memcpy(prmdata, (void *) skb->data, skb->len); | |
1026 | prmdata[7] = 0xff - (u8) skb->len; | |
6fcd61f7 | 1027 | return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
b8942e3b HB |
1028 | (void *) prmdata, 8); |
1029 | } | |
1030 | ||
eac3731b JH |
1031 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1032 | struct msghdr *msg, size_t len) | |
1033 | { | |
1034 | struct sock *sk = sock->sk; | |
1035 | struct iucv_sock *iucv = iucv_sk(sk); | |
1036 | struct sk_buff *skb; | |
1037 | struct iucv_message txmsg; | |
44b1e6b5 HB |
1038 | struct cmsghdr *cmsg; |
1039 | int cmsg_done; | |
0ea920d2 | 1040 | long timeo; |
8f7c502c UB |
1041 | char user_id[9]; |
1042 | char appl_id[9]; | |
eac3731b | 1043 | int err; |
0ea920d2 | 1044 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
1045 | |
1046 | err = sock_error(sk); | |
1047 | if (err) | |
1048 | return err; | |
1049 | ||
1050 | if (msg->msg_flags & MSG_OOB) | |
1051 | return -EOPNOTSUPP; | |
1052 | ||
aa8e71f5 HB |
1053 | /* SOCK_SEQPACKET: we do not support segmented records */ |
1054 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
1055 | return -EOPNOTSUPP; | |
1056 | ||
eac3731b JH |
1057 | lock_sock(sk); |
1058 | ||
1059 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1060 | err = -EPIPE; | |
1061 | goto out; | |
1062 | } | |
1063 | ||
bb664f49 HB |
1064 | /* Return if the socket is not in connected state */ |
1065 | if (sk->sk_state != IUCV_CONNECTED) { | |
1066 | err = -ENOTCONN; | |
1067 | goto out; | |
1068 | } | |
44b1e6b5 | 1069 | |
bb664f49 HB |
1070 | /* initialize defaults */ |
1071 | cmsg_done = 0; /* check for duplicate headers */ | |
1072 | txmsg.class = 0; | |
44b1e6b5 | 1073 | |
bb664f49 HB |
1074 | /* iterate over control messages */ |
1075 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; | |
1076 | cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
44b1e6b5 | 1077 | |
bb664f49 HB |
1078 | if (!CMSG_OK(msg, cmsg)) { |
1079 | err = -EINVAL; | |
1080 | goto out; | |
1081 | } | |
44b1e6b5 | 1082 | |
bb664f49 HB |
1083 | if (cmsg->cmsg_level != SOL_IUCV) |
1084 | continue; | |
44b1e6b5 | 1085 | |
bb664f49 HB |
1086 | if (cmsg->cmsg_type & cmsg_done) { |
1087 | err = -EINVAL; | |
1088 | goto out; | |
1089 | } | |
1090 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 1091 | |
bb664f49 HB |
1092 | switch (cmsg->cmsg_type) { |
1093 | case SCM_IUCV_TRGCLS: | |
1094 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
1095 | err = -EINVAL; |
1096 | goto out; | |
1097 | } | |
44b1e6b5 | 1098 | |
bb664f49 HB |
1099 | /* set iucv message target class */ |
1100 | memcpy(&txmsg.class, | |
1101 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 1102 | |
bb664f49 | 1103 | break; |
44b1e6b5 | 1104 | |
bb664f49 HB |
1105 | default: |
1106 | err = -EINVAL; | |
1107 | goto out; | |
1108 | break; | |
44b1e6b5 | 1109 | } |
bb664f49 | 1110 | } |
44b1e6b5 | 1111 | |
bb664f49 HB |
1112 | /* allocate one skb for each iucv message: |
1113 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
1114 | * segmented records using the MSG_EOR flag), but | |
1115 | * for SOCK_STREAM we might want to improve it in future */ | |
3881ac44 UB |
1116 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1117 | skb = sock_alloc_send_skb(sk, | |
1118 | len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, | |
1119 | noblock, &err); | |
1120 | else | |
1121 | skb = sock_alloc_send_skb(sk, len, noblock, &err); | |
800c5eb7 UB |
1122 | if (!skb) { |
1123 | err = -ENOMEM; | |
bb664f49 | 1124 | goto out; |
800c5eb7 | 1125 | } |
3881ac44 UB |
1126 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1127 | skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); | |
bb664f49 HB |
1128 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
1129 | err = -EFAULT; | |
1130 | goto fail; | |
1131 | } | |
eac3731b | 1132 | |
0ea920d2 HB |
1133 | /* wait if outstanding messages for iucv path has reached */ |
1134 | timeo = sock_sndtimeo(sk, noblock); | |
1135 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
1136 | if (err) | |
1137 | goto fail; | |
eac3731b | 1138 | |
0ea920d2 HB |
1139 | /* return -ECONNRESET if the socket is no longer connected */ |
1140 | if (sk->sk_state != IUCV_CONNECTED) { | |
1141 | err = -ECONNRESET; | |
1142 | goto fail; | |
1143 | } | |
b8942e3b | 1144 | |
bb664f49 HB |
1145 | /* increment and save iucv message tag for msg_completion cbk */ |
1146 | txmsg.tag = iucv->send_tag++; | |
1147 | memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); | |
800c5eb7 | 1148 | |
3881ac44 UB |
1149 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1150 | atomic_inc(&iucv->msg_sent); | |
1151 | err = afiucv_hs_send(&txmsg, sk, skb, 0); | |
1152 | if (err) { | |
1153 | atomic_dec(&iucv->msg_sent); | |
1154 | goto fail; | |
1155 | } | |
1156 | goto release; | |
1157 | } | |
bb664f49 | 1158 | skb_queue_tail(&iucv->send_skb_q, skb); |
b8942e3b | 1159 | |
bb664f49 HB |
1160 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
1161 | && skb->len <= 7) { | |
1162 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 1163 | |
bb664f49 HB |
1164 | /* on success: there is no message_complete callback |
1165 | * for an IPRMDATA msg; remove skb from send queue */ | |
1166 | if (err == 0) { | |
1167 | skb_unlink(skb, &iucv->send_skb_q); | |
1168 | kfree_skb(skb); | |
1169 | } | |
1170 | ||
1171 | /* this error should never happen since the | |
1172 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1173 | if (err == 0x15) { | |
6fcd61f7 | 1174 | pr_iucv->path_sever(iucv->path, NULL); |
eac3731b JH |
1175 | skb_unlink(skb, &iucv->send_skb_q); |
1176 | err = -EPIPE; | |
1177 | goto fail; | |
1178 | } | |
bb664f49 | 1179 | } else |
6fcd61f7 | 1180 | err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, |
bb664f49 HB |
1181 | (void *) skb->data, skb->len); |
1182 | if (err) { | |
1183 | if (err == 3) { | |
1184 | user_id[8] = 0; | |
1185 | memcpy(user_id, iucv->dst_user_id, 8); | |
1186 | appl_id[8] = 0; | |
1187 | memcpy(appl_id, iucv->dst_name, 8); | |
1188 | pr_err("Application %s on z/VM guest %s" | |
1189 | " exceeds message limit\n", | |
1190 | appl_id, user_id); | |
0ea920d2 HB |
1191 | err = -EAGAIN; |
1192 | } else | |
1193 | err = -EPIPE; | |
bb664f49 | 1194 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1195 | goto fail; |
eac3731b JH |
1196 | } |
1197 | ||
3881ac44 | 1198 | release: |
eac3731b JH |
1199 | release_sock(sk); |
1200 | return len; | |
1201 | ||
1202 | fail: | |
1203 | kfree_skb(skb); | |
1204 | out: | |
1205 | release_sock(sk); | |
1206 | return err; | |
1207 | } | |
1208 | ||
bf95d20f HB |
1209 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1210 | * | |
1211 | * Locking: must be called with message_q.lock held | |
1212 | */ | |
f0703c80 UB |
1213 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1214 | { | |
1215 | int dataleft, size, copied = 0; | |
1216 | struct sk_buff *nskb; | |
1217 | ||
1218 | dataleft = len; | |
1219 | while (dataleft) { | |
1220 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1221 | size = sk->sk_rcvbuf / 4; | |
1222 | else | |
1223 | size = dataleft; | |
1224 | ||
1225 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1226 | if (!nskb) | |
1227 | return -ENOMEM; | |
1228 | ||
44b1e6b5 HB |
1229 | /* copy target class to control buffer of new skb */ |
1230 | memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); | |
1231 | ||
1232 | /* copy data fragment */ | |
f0703c80 UB |
1233 | memcpy(nskb->data, skb->data + copied, size); |
1234 | copied += size; | |
1235 | dataleft -= size; | |
1236 | ||
1237 | skb_reset_transport_header(nskb); | |
1238 | skb_reset_network_header(nskb); | |
1239 | nskb->len = size; | |
1240 | ||
1241 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1242 | } | |
1243 | ||
1244 | return 0; | |
1245 | } | |
1246 | ||
bf95d20f HB |
1247 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1248 | * | |
1249 | * Locking: must be called with message_q.lock held | |
1250 | */ | |
f0703c80 UB |
1251 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1252 | struct iucv_path *path, | |
1253 | struct iucv_message *msg) | |
1254 | { | |
1255 | int rc; | |
b8942e3b HB |
1256 | unsigned int len; |
1257 | ||
1258 | len = iucv_msg_length(msg); | |
f0703c80 | 1259 | |
44b1e6b5 HB |
1260 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1261 | /* Note: the first 4 bytes are reserved for msg tag */ | |
1262 | memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); | |
1263 | ||
b8942e3b HB |
1264 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1265 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1266 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1267 | skb->data = NULL; | |
1268 | skb->len = 0; | |
1269 | } | |
f0703c80 | 1270 | } else { |
6fcd61f7 FB |
1271 | rc = pr_iucv->message_receive(path, msg, |
1272 | msg->flags & IUCV_IPRMDATA, | |
1273 | skb->data, len, NULL); | |
f0703c80 UB |
1274 | if (rc) { |
1275 | kfree_skb(skb); | |
1276 | return; | |
1277 | } | |
aa8e71f5 HB |
1278 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1279 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1280 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1281 | if (sk->sk_type == SOCK_STREAM && | |
1282 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1283 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1284 | kfree_skb(skb); |
1285 | skb = NULL; | |
1286 | if (rc) { | |
6fcd61f7 | 1287 | pr_iucv->path_sever(path, NULL); |
f0703c80 UB |
1288 | return; |
1289 | } | |
1290 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1291 | } else { | |
1292 | skb_reset_transport_header(skb); | |
1293 | skb_reset_network_header(skb); | |
b8942e3b | 1294 | skb->len = len; |
f0703c80 UB |
1295 | } |
1296 | } | |
1297 | ||
1298 | if (sock_queue_rcv_skb(sk, skb)) | |
1299 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1300 | } | |
1301 | ||
bf95d20f HB |
1302 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1303 | * | |
1304 | * Locking: must be called with message_q.lock held | |
1305 | */ | |
f0703c80 UB |
1306 | static void iucv_process_message_q(struct sock *sk) |
1307 | { | |
1308 | struct iucv_sock *iucv = iucv_sk(sk); | |
1309 | struct sk_buff *skb; | |
1310 | struct sock_msg_q *p, *n; | |
1311 | ||
1312 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1313 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1314 | if (!skb) |
1315 | break; | |
1316 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1317 | list_del(&p->list); | |
1318 | kfree(p); | |
1319 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1320 | break; | |
1321 | } | |
1322 | } | |
1323 | ||
eac3731b JH |
1324 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1325 | struct msghdr *msg, size_t len, int flags) | |
1326 | { | |
1327 | int noblock = flags & MSG_DONTWAIT; | |
1328 | struct sock *sk = sock->sk; | |
561e0360 | 1329 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1330 | unsigned int copied, rlen; |
9fbd87d4 | 1331 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b JH |
1332 | int err = 0; |
1333 | ||
aac6399c | 1334 | if ((sk->sk_state == IUCV_DISCONN) && |
f0703c80 UB |
1335 | skb_queue_empty(&iucv->backlog_skb_q) && |
1336 | skb_queue_empty(&sk->sk_receive_queue) && | |
1337 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1338 | return 0; |
1339 | ||
eac3731b JH |
1340 | if (flags & (MSG_OOB)) |
1341 | return -EOPNOTSUPP; | |
1342 | ||
60d3705f HB |
1343 | /* receive/dequeue next skb: |
1344 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1345 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1346 | if (!skb) { | |
1347 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1348 | return 0; | |
1349 | return err; | |
1350 | } | |
1351 | ||
aa8e71f5 HB |
1352 | rlen = skb->len; /* real length of skb */ |
1353 | copied = min_t(unsigned int, rlen, len); | |
82492a35 UB |
1354 | if (!rlen) |
1355 | sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; | |
eac3731b | 1356 | |
561e0360 | 1357 | cskb = skb; |
3881ac44 | 1358 | if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { |
802788bf HB |
1359 | if (!(flags & MSG_PEEK)) |
1360 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1361 | return -EFAULT; | |
eac3731b JH |
1362 | } |
1363 | ||
aa8e71f5 HB |
1364 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1365 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1366 | if (copied < rlen) | |
1367 | msg->msg_flags |= MSG_TRUNC; | |
1368 | /* each iucv message contains a complete record */ | |
1369 | msg->msg_flags |= MSG_EOR; | |
1370 | } | |
eac3731b | 1371 | |
44b1e6b5 HB |
1372 | /* create control message to store iucv msg target class: |
1373 | * get the trgcls from the control buffer of the skb due to | |
1374 | * fragmentation of original iucv message. */ | |
1375 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
1376 | CB_TRGCLS_LEN, CB_TRGCLS(skb)); | |
1377 | if (err) { | |
1378 | if (!(flags & MSG_PEEK)) | |
1379 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1380 | return err; | |
1381 | } | |
1382 | ||
eac3731b JH |
1383 | /* Mark read part of skb as used */ |
1384 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1385 | |
aa8e71f5 HB |
1386 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1387 | if (sk->sk_type == SOCK_STREAM) { | |
1388 | skb_pull(skb, copied); | |
1389 | if (skb->len) { | |
1390 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1391 | goto done; | |
1392 | } | |
eac3731b JH |
1393 | } |
1394 | ||
1395 | kfree_skb(skb); | |
800c5eb7 UB |
1396 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1397 | atomic_inc(&iucv->msg_recv); | |
1398 | if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { | |
1399 | WARN_ON(1); | |
1400 | iucv_sock_close(sk); | |
1401 | return -EFAULT; | |
1402 | } | |
1403 | } | |
561e0360 JH |
1404 | |
1405 | /* Queue backlog skbs */ | |
bf95d20f | 1406 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1407 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1408 | while (rskb) { |
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)) | |
1467 | mask |= POLLERR; | |
1468 | ||
1469 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1470 | mask |= POLLRDHUP; | |
1471 | ||
1472 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1473 | mask |= POLLHUP; | |
1474 | ||
1475 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1476 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1477 | mask |= POLLIN | POLLRDNORM; |
1478 | ||
1479 | if (sk->sk_state == IUCV_CLOSED) | |
1480 | mask |= POLLHUP; | |
1481 | ||
aac6399c | 1482 | if (sk->sk_state == IUCV_DISCONN) |
561e0360 JH |
1483 | mask |= POLLIN; |
1484 | ||
7f1b0ea4 | 1485 | if (sock_writeable(sk) && iucv_below_msglim(sk)) |
eac3731b JH |
1486 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
1487 | else | |
1488 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1489 | ||
1490 | return mask; | |
1491 | } | |
1492 | ||
1493 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1494 | { | |
1495 | struct sock *sk = sock->sk; | |
1496 | struct iucv_sock *iucv = iucv_sk(sk); | |
1497 | struct iucv_message txmsg; | |
1498 | int err = 0; | |
eac3731b JH |
1499 | |
1500 | how++; | |
1501 | ||
1502 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1503 | return -EINVAL; | |
1504 | ||
1505 | lock_sock(sk); | |
da99f056 | 1506 | switch (sk->sk_state) { |
82492a35 | 1507 | case IUCV_LISTEN: |
e14ad5fa HB |
1508 | case IUCV_DISCONN: |
1509 | case IUCV_CLOSING: | |
eac3731b JH |
1510 | case IUCV_CLOSED: |
1511 | err = -ENOTCONN; | |
1512 | goto fail; | |
eac3731b | 1513 | default: |
eac3731b JH |
1514 | break; |
1515 | } | |
1516 | ||
1517 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
82492a35 UB |
1518 | if (iucv->transport == AF_IUCV_TRANS_IUCV) { |
1519 | txmsg.class = 0; | |
1520 | txmsg.tag = 0; | |
1521 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1522 | IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); | |
1523 | if (err) { | |
1524 | switch (err) { | |
1525 | case 1: | |
1526 | err = -ENOTCONN; | |
1527 | break; | |
1528 | case 2: | |
1529 | err = -ECONNRESET; | |
1530 | break; | |
1531 | default: | |
1532 | err = -ENOTCONN; | |
1533 | break; | |
1534 | } | |
eac3731b | 1535 | } |
82492a35 UB |
1536 | } else |
1537 | iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); | |
eac3731b JH |
1538 | } |
1539 | ||
82492a35 | 1540 | sk->sk_shutdown |= how; |
eac3731b | 1541 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { |
82492a35 UB |
1542 | if (iucv->transport == AF_IUCV_TRANS_IUCV) { |
1543 | err = pr_iucv->path_quiesce(iucv->path, NULL); | |
1544 | if (err) | |
1545 | err = -ENOTCONN; | |
1546 | /* skb_queue_purge(&sk->sk_receive_queue); */ | |
1547 | } | |
eac3731b JH |
1548 | skb_queue_purge(&sk->sk_receive_queue); |
1549 | } | |
1550 | ||
1551 | /* Wake up anyone sleeping in poll */ | |
1552 | sk->sk_state_change(sk); | |
1553 | ||
1554 | fail: | |
1555 | release_sock(sk); | |
1556 | return err; | |
1557 | } | |
1558 | ||
1559 | static int iucv_sock_release(struct socket *sock) | |
1560 | { | |
1561 | struct sock *sk = sock->sk; | |
1562 | int err = 0; | |
1563 | ||
1564 | if (!sk) | |
1565 | return 0; | |
1566 | ||
1567 | iucv_sock_close(sk); | |
1568 | ||
eac3731b JH |
1569 | sock_orphan(sk); |
1570 | iucv_sock_kill(sk); | |
1571 | return err; | |
1572 | } | |
1573 | ||
9d5c5d8f HB |
1574 | /* getsockopt and setsockopt */ |
1575 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1576 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1577 | { |
1578 | struct sock *sk = sock->sk; | |
1579 | struct iucv_sock *iucv = iucv_sk(sk); | |
1580 | int val; | |
1581 | int rc; | |
1582 | ||
1583 | if (level != SOL_IUCV) | |
1584 | return -ENOPROTOOPT; | |
1585 | ||
1586 | if (optlen < sizeof(int)) | |
1587 | return -EINVAL; | |
1588 | ||
1589 | if (get_user(val, (int __user *) optval)) | |
1590 | return -EFAULT; | |
1591 | ||
1592 | rc = 0; | |
1593 | ||
1594 | lock_sock(sk); | |
1595 | switch (optname) { | |
1596 | case SO_IPRMDATA_MSG: | |
1597 | if (val) | |
1598 | iucv->flags |= IUCV_IPRMDATA; | |
1599 | else | |
1600 | iucv->flags &= ~IUCV_IPRMDATA; | |
1601 | break; | |
09488e2e HB |
1602 | case SO_MSGLIMIT: |
1603 | switch (sk->sk_state) { | |
1604 | case IUCV_OPEN: | |
1605 | case IUCV_BOUND: | |
1606 | if (val < 1 || val > (u16)(~0)) | |
1607 | rc = -EINVAL; | |
1608 | else | |
1609 | iucv->msglimit = val; | |
1610 | break; | |
1611 | default: | |
1612 | rc = -EINVAL; | |
1613 | break; | |
1614 | } | |
1615 | break; | |
9d5c5d8f HB |
1616 | default: |
1617 | rc = -ENOPROTOOPT; | |
1618 | break; | |
1619 | } | |
1620 | release_sock(sk); | |
1621 | ||
1622 | return rc; | |
1623 | } | |
1624 | ||
1625 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1626 | char __user *optval, int __user *optlen) | |
1627 | { | |
1628 | struct sock *sk = sock->sk; | |
1629 | struct iucv_sock *iucv = iucv_sk(sk); | |
51363b87 UB |
1630 | unsigned int val; |
1631 | int len; | |
9d5c5d8f HB |
1632 | |
1633 | if (level != SOL_IUCV) | |
1634 | return -ENOPROTOOPT; | |
1635 | ||
1636 | if (get_user(len, optlen)) | |
1637 | return -EFAULT; | |
1638 | ||
1639 | if (len < 0) | |
1640 | return -EINVAL; | |
1641 | ||
1642 | len = min_t(unsigned int, len, sizeof(int)); | |
1643 | ||
1644 | switch (optname) { | |
1645 | case SO_IPRMDATA_MSG: | |
1646 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1647 | break; | |
09488e2e HB |
1648 | case SO_MSGLIMIT: |
1649 | lock_sock(sk); | |
1650 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1651 | : iucv->msglimit; /* default */ | |
1652 | release_sock(sk); | |
1653 | break; | |
51363b87 UB |
1654 | case SO_MSGSIZE: |
1655 | if (sk->sk_state == IUCV_OPEN) | |
1656 | return -EBADFD; | |
1657 | val = (iucv->hs_dev) ? iucv->hs_dev->mtu - | |
1658 | sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : | |
1659 | 0x7fffffff; | |
1660 | break; | |
9d5c5d8f HB |
1661 | default: |
1662 | return -ENOPROTOOPT; | |
1663 | } | |
1664 | ||
1665 | if (put_user(len, optlen)) | |
1666 | return -EFAULT; | |
1667 | if (copy_to_user(optval, &val, len)) | |
1668 | return -EFAULT; | |
1669 | ||
1670 | return 0; | |
1671 | } | |
1672 | ||
1673 | ||
eac3731b JH |
1674 | /* Callback wrappers - called from iucv base support */ |
1675 | static int iucv_callback_connreq(struct iucv_path *path, | |
1676 | u8 ipvmid[8], u8 ipuser[16]) | |
1677 | { | |
1678 | unsigned char user_data[16]; | |
1679 | unsigned char nuser_data[16]; | |
1680 | unsigned char src_name[8]; | |
1681 | struct hlist_node *node; | |
1682 | struct sock *sk, *nsk; | |
1683 | struct iucv_sock *iucv, *niucv; | |
1684 | int err; | |
1685 | ||
1686 | memcpy(src_name, ipuser, 8); | |
1687 | EBCASC(src_name, 8); | |
1688 | /* Find out if this path belongs to af_iucv. */ | |
1689 | read_lock(&iucv_sk_list.lock); | |
1690 | iucv = NULL; | |
febca281 | 1691 | sk = NULL; |
eac3731b JH |
1692 | sk_for_each(sk, node, &iucv_sk_list.head) |
1693 | if (sk->sk_state == IUCV_LISTEN && | |
1694 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1695 | /* | |
1696 | * Found a listening socket with | |
1697 | * src_name == ipuser[0-7]. | |
1698 | */ | |
1699 | iucv = iucv_sk(sk); | |
1700 | break; | |
1701 | } | |
1702 | read_unlock(&iucv_sk_list.lock); | |
1703 | if (!iucv) | |
1704 | /* No socket found, not one of our paths. */ | |
1705 | return -EINVAL; | |
1706 | ||
1707 | bh_lock_sock(sk); | |
1708 | ||
1709 | /* Check if parent socket is listening */ | |
1710 | low_nmcpy(user_data, iucv->src_name); | |
1711 | high_nmcpy(user_data, iucv->dst_name); | |
1712 | ASCEBC(user_data, sizeof(user_data)); | |
1713 | if (sk->sk_state != IUCV_LISTEN) { | |
6fcd61f7 | 1714 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1715 | iucv_path_free(path); |
eac3731b JH |
1716 | goto fail; |
1717 | } | |
1718 | ||
1719 | /* Check for backlog size */ | |
1720 | if (sk_acceptq_is_full(sk)) { | |
6fcd61f7 | 1721 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1722 | iucv_path_free(path); |
eac3731b JH |
1723 | goto fail; |
1724 | } | |
1725 | ||
1726 | /* Create the new socket */ | |
aa8e71f5 | 1727 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
da99f056 | 1728 | if (!nsk) { |
6fcd61f7 | 1729 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1730 | iucv_path_free(path); |
eac3731b JH |
1731 | goto fail; |
1732 | } | |
1733 | ||
1734 | niucv = iucv_sk(nsk); | |
1735 | iucv_sock_init(nsk, sk); | |
1736 | ||
1737 | /* Set the new iucv_sock */ | |
1738 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1739 | EBCASC(niucv->dst_name, 8); | |
1740 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1741 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1742 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1743 | niucv->path = path; | |
1744 | ||
1745 | /* Call iucv_accept */ | |
1746 | high_nmcpy(nuser_data, ipuser + 8); | |
1747 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1748 | ASCEBC(nuser_data + 8, 8); | |
1749 | ||
09488e2e HB |
1750 | /* set message limit for path based on msglimit of accepting socket */ |
1751 | niucv->msglimit = iucv->msglimit; | |
1752 | path->msglim = iucv->msglimit; | |
6fcd61f7 | 1753 | err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1754 | if (err) { |
7d316b94 | 1755 | iucv_sever_path(nsk, 1); |
65dbd7c2 | 1756 | iucv_sock_kill(nsk); |
eac3731b JH |
1757 | goto fail; |
1758 | } | |
1759 | ||
1760 | iucv_accept_enqueue(sk, nsk); | |
1761 | ||
1762 | /* Wake up accept */ | |
1763 | nsk->sk_state = IUCV_CONNECTED; | |
1764 | sk->sk_data_ready(sk, 1); | |
1765 | err = 0; | |
1766 | fail: | |
1767 | bh_unlock_sock(sk); | |
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1772 | { | |
1773 | struct sock *sk = path->private; | |
1774 | ||
1775 | sk->sk_state = IUCV_CONNECTED; | |
1776 | sk->sk_state_change(sk); | |
1777 | } | |
1778 | ||
1779 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1780 | { | |
1781 | struct sock *sk = path->private; | |
561e0360 | 1782 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1783 | struct sk_buff *skb; |
1784 | struct sock_msg_q *save_msg; | |
1785 | int len; | |
561e0360 | 1786 | |
fe86e54e | 1787 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
6fcd61f7 | 1788 | pr_iucv->message_reject(path, msg); |
eac3731b | 1789 | return; |
fe86e54e | 1790 | } |
eac3731b | 1791 | |
3fa6b5ad | 1792 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1793 | |
f0703c80 UB |
1794 | if (!list_empty(&iucv->message_q.list) || |
1795 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1796 | goto save_message; | |
1797 | ||
1798 | len = atomic_read(&sk->sk_rmem_alloc); | |
87fb4b7b | 1799 | len += SKB_TRUESIZE(iucv_msg_length(msg)); |
f0703c80 UB |
1800 | if (len > sk->sk_rcvbuf) |
1801 | goto save_message; | |
1802 | ||
b8942e3b | 1803 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1804 | if (!skb) |
1805 | goto save_message; | |
eac3731b | 1806 | |
f0703c80 | 1807 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1808 | goto out_unlock; |
eac3731b | 1809 | |
f0703c80 UB |
1810 | save_message: |
1811 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1812 | if (!save_msg) |
a56635a5 | 1813 | goto out_unlock; |
f0703c80 UB |
1814 | save_msg->path = path; |
1815 | save_msg->msg = *msg; | |
eac3731b | 1816 | |
f0703c80 | 1817 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1818 | |
1819 | out_unlock: | |
f0703c80 | 1820 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1821 | } |
1822 | ||
1823 | static void iucv_callback_txdone(struct iucv_path *path, | |
1824 | struct iucv_message *msg) | |
1825 | { | |
1826 | struct sock *sk = path->private; | |
f2a77991 | 1827 | struct sk_buff *this = NULL; |
eac3731b JH |
1828 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1829 | struct sk_buff *list_skb = list->next; | |
1830 | unsigned long flags; | |
1831 | ||
7d316b94 | 1832 | bh_lock_sock(sk); |
f2a77991 | 1833 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1834 | spin_lock_irqsave(&list->lock, flags); |
1835 | ||
f2a77991 | 1836 | while (list_skb != (struct sk_buff *)list) { |
44b1e6b5 | 1837 | if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { |
f2a77991 UB |
1838 | this = list_skb; |
1839 | break; | |
1840 | } | |
561e0360 | 1841 | list_skb = list_skb->next; |
f2a77991 UB |
1842 | } |
1843 | if (this) | |
1844 | __skb_unlink(this, list); | |
561e0360 JH |
1845 | |
1846 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1847 | |
0ea920d2 HB |
1848 | if (this) { |
1849 | kfree_skb(this); | |
1850 | /* wake up any process waiting for sending */ | |
1851 | iucv_sock_wake_msglim(sk); | |
1852 | } | |
561e0360 | 1853 | } |
eac3731b | 1854 | |
da99f056 | 1855 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1856 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1857 | sk->sk_state = IUCV_CLOSED; | |
1858 | sk->sk_state_change(sk); | |
1859 | } | |
1860 | } | |
7d316b94 | 1861 | bh_unlock_sock(sk); |
eac3731b | 1862 | |
eac3731b JH |
1863 | } |
1864 | ||
1865 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1866 | { | |
1867 | struct sock *sk = path->private; | |
1868 | ||
7d316b94 UB |
1869 | if (sk->sk_state == IUCV_CLOSED) |
1870 | return; | |
1871 | ||
1872 | bh_lock_sock(sk); | |
1873 | iucv_sever_path(sk, 1); | |
aac6399c | 1874 | sk->sk_state = IUCV_DISCONN; |
eac3731b JH |
1875 | |
1876 | sk->sk_state_change(sk); | |
7d316b94 | 1877 | bh_unlock_sock(sk); |
eac3731b JH |
1878 | } |
1879 | ||
af88b52d HB |
1880 | /* called if the other communication side shuts down its RECV direction; |
1881 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1882 | */ | |
1883 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1884 | { | |
1885 | struct sock *sk = path->private; | |
1886 | ||
1887 | bh_lock_sock(sk); | |
1888 | if (sk->sk_state != IUCV_CLOSED) { | |
1889 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1890 | sk->sk_state_change(sk); | |
1891 | } | |
1892 | bh_unlock_sock(sk); | |
1893 | } | |
1894 | ||
3881ac44 UB |
1895 | /***************** HiperSockets transport callbacks ********************/ |
1896 | static void afiucv_swap_src_dest(struct sk_buff *skb) | |
1897 | { | |
1898 | struct af_iucv_trans_hdr *trans_hdr = | |
1899 | (struct af_iucv_trans_hdr *)skb->data; | |
1900 | char tmpID[8]; | |
1901 | char tmpName[8]; | |
1902 | ||
1903 | ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
1904 | ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
1905 | ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
1906 | ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
1907 | memcpy(tmpID, trans_hdr->srcUserID, 8); | |
1908 | memcpy(tmpName, trans_hdr->srcAppName, 8); | |
1909 | memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); | |
1910 | memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); | |
1911 | memcpy(trans_hdr->destUserID, tmpID, 8); | |
1912 | memcpy(trans_hdr->destAppName, tmpName, 8); | |
1913 | skb_push(skb, ETH_HLEN); | |
1914 | memset(skb->data, 0, ETH_HLEN); | |
1915 | } | |
1916 | ||
1917 | /** | |
1918 | * afiucv_hs_callback_syn - react on received SYN | |
1919 | **/ | |
1920 | static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) | |
1921 | { | |
1922 | struct sock *nsk; | |
1923 | struct iucv_sock *iucv, *niucv; | |
1924 | struct af_iucv_trans_hdr *trans_hdr; | |
1925 | int err; | |
1926 | ||
1927 | iucv = iucv_sk(sk); | |
1928 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
1929 | if (!iucv) { | |
1930 | /* no sock - connection refused */ | |
1931 | afiucv_swap_src_dest(skb); | |
1932 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1933 | err = dev_queue_xmit(skb); | |
1934 | goto out; | |
1935 | } | |
1936 | ||
1937 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); | |
1938 | bh_lock_sock(sk); | |
1939 | if ((sk->sk_state != IUCV_LISTEN) || | |
1940 | sk_acceptq_is_full(sk) || | |
1941 | !nsk) { | |
1942 | /* error on server socket - connection refused */ | |
1943 | if (nsk) | |
1944 | sk_free(nsk); | |
1945 | afiucv_swap_src_dest(skb); | |
1946 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1947 | err = dev_queue_xmit(skb); | |
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; | |
1975 | sk->sk_data_ready(sk, 1); | |
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); | |
2098 | spin_lock(&iucv->message_q.lock); | |
2099 | if (skb_queue_empty(&iucv->backlog_skb_q)) { | |
2100 | if (sock_queue_rcv_skb(sk, skb)) { | |
2101 | /* handle rcv queue full */ | |
2102 | skb_queue_tail(&iucv->backlog_skb_q, skb); | |
2103 | } | |
2104 | } else | |
2105 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
2106 | spin_unlock(&iucv->message_q.lock); | |
2107 | return NET_RX_SUCCESS; | |
2108 | } | |
2109 | ||
2110 | /** | |
2111 | * afiucv_hs_rcv() - base function for arriving data through HiperSockets | |
2112 | * transport | |
2113 | * called from netif RX softirq | |
2114 | **/ | |
2115 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, | |
2116 | struct packet_type *pt, struct net_device *orig_dev) | |
2117 | { | |
2118 | struct hlist_node *node; | |
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); | |
2135 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
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 */ | |
c64d3f8f UB |
2203 | memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class, |
2204 | CB_TRGCLS_LEN); | |
3881ac44 UB |
2205 | err = afiucv_hs_callback_rx(sk, skb); |
2206 | break; | |
2207 | default: | |
2208 | ; | |
2209 | } | |
2210 | ||
2211 | return err; | |
2212 | } | |
2213 | ||
2214 | /** | |
2215 | * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets | |
2216 | * transport | |
2217 | **/ | |
2218 | static void afiucv_hs_callback_txnotify(struct sk_buff *skb, | |
2219 | enum iucv_tx_notify n) | |
2220 | { | |
2221 | struct sock *isk = skb->sk; | |
2222 | struct sock *sk = NULL; | |
2223 | struct iucv_sock *iucv = NULL; | |
2224 | struct sk_buff_head *list; | |
2225 | struct sk_buff *list_skb; | |
800c5eb7 | 2226 | struct sk_buff *nskb; |
3881ac44 UB |
2227 | unsigned long flags; |
2228 | struct hlist_node *node; | |
2229 | ||
800c5eb7 | 2230 | read_lock_irqsave(&iucv_sk_list.lock, flags); |
3881ac44 UB |
2231 | sk_for_each(sk, node, &iucv_sk_list.head) |
2232 | if (sk == isk) { | |
2233 | iucv = iucv_sk(sk); | |
2234 | break; | |
2235 | } | |
800c5eb7 | 2236 | read_unlock_irqrestore(&iucv_sk_list.lock, flags); |
3881ac44 | 2237 | |
800c5eb7 | 2238 | if (!iucv || sock_flag(sk, SOCK_ZAPPED)) |
3881ac44 UB |
2239 | return; |
2240 | ||
3881ac44 | 2241 | list = &iucv->send_skb_q; |
800c5eb7 | 2242 | spin_lock_irqsave(&list->lock, flags); |
3881ac44 UB |
2243 | if (skb_queue_empty(list)) |
2244 | goto out_unlock; | |
800c5eb7 UB |
2245 | list_skb = list->next; |
2246 | nskb = list_skb->next; | |
3881ac44 UB |
2247 | while (list_skb != (struct sk_buff *)list) { |
2248 | if (skb_shinfo(list_skb) == skb_shinfo(skb)) { | |
3881ac44 UB |
2249 | switch (n) { |
2250 | case TX_NOTIFY_OK: | |
800c5eb7 UB |
2251 | __skb_unlink(list_skb, list); |
2252 | kfree_skb(list_skb); | |
3881ac44 | 2253 | iucv_sock_wake_msglim(sk); |
3881ac44 UB |
2254 | break; |
2255 | case TX_NOTIFY_PENDING: | |
2256 | atomic_inc(&iucv->pendings); | |
2257 | break; | |
2258 | case TX_NOTIFY_DELAYED_OK: | |
800c5eb7 | 2259 | __skb_unlink(list_skb, list); |
3881ac44 UB |
2260 | atomic_dec(&iucv->pendings); |
2261 | if (atomic_read(&iucv->pendings) <= 0) | |
2262 | iucv_sock_wake_msglim(sk); | |
800c5eb7 | 2263 | kfree_skb(list_skb); |
3881ac44 UB |
2264 | break; |
2265 | case TX_NOTIFY_UNREACHABLE: | |
2266 | case TX_NOTIFY_DELAYED_UNREACHABLE: | |
2267 | case TX_NOTIFY_TPQFULL: /* not yet used */ | |
2268 | case TX_NOTIFY_GENERALERROR: | |
2269 | case TX_NOTIFY_DELAYED_GENERALERROR: | |
800c5eb7 UB |
2270 | __skb_unlink(list_skb, list); |
2271 | kfree_skb(list_skb); | |
2272 | if (sk->sk_state == IUCV_CONNECTED) { | |
2273 | sk->sk_state = IUCV_DISCONN; | |
2274 | sk->sk_state_change(sk); | |
2275 | } | |
3881ac44 UB |
2276 | break; |
2277 | } | |
2278 | break; | |
2279 | } | |
800c5eb7 UB |
2280 | list_skb = nskb; |
2281 | nskb = nskb->next; | |
3881ac44 | 2282 | } |
800c5eb7 | 2283 | out_unlock: |
3881ac44 UB |
2284 | spin_unlock_irqrestore(&list->lock, flags); |
2285 | ||
42bd48e0 UB |
2286 | if (sk->sk_state == IUCV_CLOSING) { |
2287 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { | |
2288 | sk->sk_state = IUCV_CLOSED; | |
2289 | sk->sk_state_change(sk); | |
2290 | } | |
2291 | } | |
2292 | ||
3881ac44 | 2293 | } |
9fbd87d4 UB |
2294 | |
2295 | /* | |
2296 | * afiucv_netdev_event: handle netdev notifier chain events | |
2297 | */ | |
2298 | static int afiucv_netdev_event(struct notifier_block *this, | |
2299 | unsigned long event, void *ptr) | |
2300 | { | |
2301 | struct net_device *event_dev = (struct net_device *)ptr; | |
2302 | struct hlist_node *node; | |
2303 | struct sock *sk; | |
2304 | struct iucv_sock *iucv; | |
2305 | ||
2306 | switch (event) { | |
2307 | case NETDEV_REBOOT: | |
2308 | case NETDEV_GOING_DOWN: | |
2309 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
2310 | iucv = iucv_sk(sk); | |
2311 | if ((iucv->hs_dev == event_dev) && | |
2312 | (sk->sk_state == IUCV_CONNECTED)) { | |
2313 | if (event == NETDEV_GOING_DOWN) | |
2314 | iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); | |
2315 | sk->sk_state = IUCV_DISCONN; | |
2316 | sk->sk_state_change(sk); | |
2317 | } | |
2318 | } | |
2319 | break; | |
2320 | case NETDEV_DOWN: | |
2321 | case NETDEV_UNREGISTER: | |
2322 | default: | |
2323 | break; | |
2324 | } | |
2325 | return NOTIFY_DONE; | |
2326 | } | |
2327 | ||
2328 | static struct notifier_block afiucv_netdev_notifier = { | |
2329 | .notifier_call = afiucv_netdev_event, | |
2330 | }; | |
2331 | ||
5708e868 | 2332 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
2333 | .family = PF_IUCV, |
2334 | .owner = THIS_MODULE, | |
2335 | .release = iucv_sock_release, | |
2336 | .bind = iucv_sock_bind, | |
2337 | .connect = iucv_sock_connect, | |
2338 | .listen = iucv_sock_listen, | |
2339 | .accept = iucv_sock_accept, | |
2340 | .getname = iucv_sock_getname, | |
2341 | .sendmsg = iucv_sock_sendmsg, | |
2342 | .recvmsg = iucv_sock_recvmsg, | |
2343 | .poll = iucv_sock_poll, | |
2344 | .ioctl = sock_no_ioctl, | |
2345 | .mmap = sock_no_mmap, | |
2346 | .socketpair = sock_no_socketpair, | |
2347 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
2348 | .setsockopt = iucv_sock_setsockopt, |
2349 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
2350 | }; |
2351 | ||
ec1b4cf7 | 2352 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
2353 | .family = AF_IUCV, |
2354 | .owner = THIS_MODULE, | |
2355 | .create = iucv_sock_create, | |
2356 | }; | |
2357 | ||
3881ac44 UB |
2358 | static struct packet_type iucv_packet_type = { |
2359 | .type = cpu_to_be16(ETH_P_AF_IUCV), | |
2360 | .func = afiucv_hs_rcv, | |
2361 | }; | |
2362 | ||
2363 | static int afiucv_iucv_init(void) | |
6fcd61f7 FB |
2364 | { |
2365 | int err; | |
2366 | ||
2367 | err = pr_iucv->iucv_register(&af_iucv_handler, 0); | |
2368 | if (err) | |
2369 | goto out; | |
2370 | /* establish dummy device */ | |
2371 | af_iucv_driver.bus = pr_iucv->bus; | |
2372 | err = driver_register(&af_iucv_driver); | |
2373 | if (err) | |
2374 | goto out_iucv; | |
2375 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
2376 | if (!af_iucv_dev) { | |
2377 | err = -ENOMEM; | |
2378 | goto out_driver; | |
2379 | } | |
2380 | dev_set_name(af_iucv_dev, "af_iucv"); | |
2381 | af_iucv_dev->bus = pr_iucv->bus; | |
2382 | af_iucv_dev->parent = pr_iucv->root; | |
2383 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
2384 | af_iucv_dev->driver = &af_iucv_driver; | |
2385 | err = device_register(af_iucv_dev); | |
2386 | if (err) | |
2387 | goto out_driver; | |
2388 | return 0; | |
2389 | ||
2390 | out_driver: | |
2391 | driver_unregister(&af_iucv_driver); | |
2392 | out_iucv: | |
2393 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2394 | out: | |
2395 | return err; | |
2396 | } | |
2397 | ||
da99f056 | 2398 | static int __init afiucv_init(void) |
eac3731b JH |
2399 | { |
2400 | int err; | |
2401 | ||
3881ac44 UB |
2402 | if (MACHINE_IS_VM) { |
2403 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
2404 | if (unlikely(err)) { | |
2405 | WARN_ON(err); | |
2406 | err = -EPROTONOSUPPORT; | |
2407 | goto out; | |
2408 | } | |
eac3731b | 2409 | |
3881ac44 UB |
2410 | pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); |
2411 | if (!pr_iucv) { | |
2412 | printk(KERN_WARNING "iucv_if lookup failed\n"); | |
2413 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2414 | } | |
2415 | } else { | |
2416 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2417 | pr_iucv = NULL; | |
6fcd61f7 FB |
2418 | } |
2419 | ||
eac3731b JH |
2420 | err = proto_register(&iucv_proto, 0); |
2421 | if (err) | |
6fcd61f7 | 2422 | goto out; |
eac3731b JH |
2423 | err = sock_register(&iucv_sock_family_ops); |
2424 | if (err) | |
2425 | goto out_proto; | |
6fcd61f7 | 2426 | |
3881ac44 UB |
2427 | if (pr_iucv) { |
2428 | err = afiucv_iucv_init(); | |
2429 | if (err) | |
2430 | goto out_sock; | |
9fbd87d4 UB |
2431 | } else |
2432 | register_netdevice_notifier(&afiucv_netdev_notifier); | |
3881ac44 | 2433 | dev_add_pack(&iucv_packet_type); |
eac3731b JH |
2434 | return 0; |
2435 | ||
c23cad92 UB |
2436 | out_sock: |
2437 | sock_unregister(PF_IUCV); | |
eac3731b JH |
2438 | out_proto: |
2439 | proto_unregister(&iucv_proto); | |
eac3731b | 2440 | out: |
6fcd61f7 FB |
2441 | if (pr_iucv) |
2442 | symbol_put(iucv_if); | |
eac3731b JH |
2443 | return err; |
2444 | } | |
2445 | ||
2446 | static void __exit afiucv_exit(void) | |
2447 | { | |
3881ac44 UB |
2448 | if (pr_iucv) { |
2449 | device_unregister(af_iucv_dev); | |
2450 | driver_unregister(&af_iucv_driver); | |
2451 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2452 | symbol_put(iucv_if); | |
9fbd87d4 UB |
2453 | } else |
2454 | unregister_netdevice_notifier(&afiucv_netdev_notifier); | |
3881ac44 | 2455 | dev_remove_pack(&iucv_packet_type); |
eac3731b JH |
2456 | sock_unregister(PF_IUCV); |
2457 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2458 | } |
2459 | ||
2460 | module_init(afiucv_init); | |
2461 | module_exit(afiucv_exit); | |
2462 | ||
2463 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
2464 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
2465 | MODULE_VERSION(VERSION); | |
2466 | MODULE_LICENSE("GPL"); | |
2467 | MODULE_ALIAS_NETPROTO(PF_IUCV); | |
3881ac44 | 2468 |