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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 | ||
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); | |
93 | ||
3881ac44 UB |
94 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, |
95 | struct packet_type *pt, struct net_device *orig_dev); | |
96 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
97 | struct sk_buff *skb, u8 flags); | |
98 | static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); | |
99 | ||
eac3731b JH |
100 | /* Call Back functions */ |
101 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
102 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
103 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
104 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
105 | u8 ipuser[16]); | |
eac3731b | 106 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 107 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
108 | |
109 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 110 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
111 | .autobind_name = ATOMIC_INIT(0) |
112 | }; | |
113 | ||
114 | static struct iucv_handler af_iucv_handler = { | |
115 | .path_pending = iucv_callback_connreq, | |
116 | .path_complete = iucv_callback_connack, | |
117 | .path_severed = iucv_callback_connrej, | |
118 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
119 | .message_complete = iucv_callback_txdone, |
120 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
121 | }; |
122 | ||
123 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
124 | { | |
125 | memcpy(dst, src, 8); | |
126 | } | |
127 | ||
128 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
129 | { | |
130 | memcpy(&dst[8], src, 8); | |
131 | } | |
132 | ||
c23cad92 UB |
133 | static int afiucv_pm_prepare(struct device *dev) |
134 | { | |
135 | #ifdef CONFIG_PM_DEBUG | |
136 | printk(KERN_WARNING "afiucv_pm_prepare\n"); | |
137 | #endif | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static void afiucv_pm_complete(struct device *dev) | |
142 | { | |
143 | #ifdef CONFIG_PM_DEBUG | |
144 | printk(KERN_WARNING "afiucv_pm_complete\n"); | |
145 | #endif | |
c23cad92 UB |
146 | } |
147 | ||
148 | /** | |
149 | * afiucv_pm_freeze() - Freeze PM callback | |
150 | * @dev: AFIUCV dummy device | |
151 | * | |
152 | * Sever all established IUCV communication pathes | |
153 | */ | |
154 | static int afiucv_pm_freeze(struct device *dev) | |
155 | { | |
156 | struct iucv_sock *iucv; | |
157 | struct sock *sk; | |
158 | struct hlist_node *node; | |
159 | int err = 0; | |
160 | ||
161 | #ifdef CONFIG_PM_DEBUG | |
162 | printk(KERN_WARNING "afiucv_pm_freeze\n"); | |
163 | #endif | |
164 | read_lock(&iucv_sk_list.lock); | |
165 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
166 | iucv = iucv_sk(sk); | |
167 | skb_queue_purge(&iucv->send_skb_q); | |
168 | skb_queue_purge(&iucv->backlog_skb_q); | |
169 | switch (sk->sk_state) { | |
170 | case IUCV_SEVERED: | |
171 | case IUCV_DISCONN: | |
172 | case IUCV_CLOSING: | |
173 | case IUCV_CONNECTED: | |
174 | if (iucv->path) { | |
6fcd61f7 | 175 | err = pr_iucv->path_sever(iucv->path, NULL); |
c23cad92 UB |
176 | iucv_path_free(iucv->path); |
177 | iucv->path = NULL; | |
178 | } | |
179 | break; | |
180 | case IUCV_OPEN: | |
181 | case IUCV_BOUND: | |
182 | case IUCV_LISTEN: | |
183 | case IUCV_CLOSED: | |
184 | default: | |
185 | break; | |
186 | } | |
187 | } | |
188 | read_unlock(&iucv_sk_list.lock); | |
189 | return err; | |
190 | } | |
191 | ||
192 | /** | |
193 | * afiucv_pm_restore_thaw() - Thaw and restore PM callback | |
194 | * @dev: AFIUCV dummy device | |
195 | * | |
196 | * socket clean up after freeze | |
197 | */ | |
198 | static int afiucv_pm_restore_thaw(struct device *dev) | |
199 | { | |
c23cad92 UB |
200 | struct sock *sk; |
201 | struct hlist_node *node; | |
202 | ||
203 | #ifdef CONFIG_PM_DEBUG | |
204 | printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); | |
205 | #endif | |
206 | read_lock(&iucv_sk_list.lock); | |
207 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
c23cad92 UB |
208 | switch (sk->sk_state) { |
209 | case IUCV_CONNECTED: | |
210 | sk->sk_err = EPIPE; | |
211 | sk->sk_state = IUCV_DISCONN; | |
212 | sk->sk_state_change(sk); | |
213 | break; | |
214 | case IUCV_DISCONN: | |
215 | case IUCV_SEVERED: | |
216 | case IUCV_CLOSING: | |
217 | case IUCV_LISTEN: | |
218 | case IUCV_BOUND: | |
219 | case IUCV_OPEN: | |
220 | default: | |
221 | break; | |
222 | } | |
223 | } | |
224 | read_unlock(&iucv_sk_list.lock); | |
225 | return 0; | |
226 | } | |
227 | ||
47145210 | 228 | static const struct dev_pm_ops afiucv_pm_ops = { |
c23cad92 UB |
229 | .prepare = afiucv_pm_prepare, |
230 | .complete = afiucv_pm_complete, | |
231 | .freeze = afiucv_pm_freeze, | |
232 | .thaw = afiucv_pm_restore_thaw, | |
233 | .restore = afiucv_pm_restore_thaw, | |
234 | }; | |
235 | ||
236 | static struct device_driver af_iucv_driver = { | |
237 | .owner = THIS_MODULE, | |
238 | .name = "afiucv", | |
6fcd61f7 | 239 | .bus = NULL, |
c23cad92 UB |
240 | .pm = &afiucv_pm_ops, |
241 | }; | |
242 | ||
243 | /* dummy device used as trigger for PM functions */ | |
244 | static struct device *af_iucv_dev; | |
245 | ||
b8942e3b HB |
246 | /** |
247 | * iucv_msg_length() - Returns the length of an iucv message. | |
248 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
249 | * | |
250 | * The function returns the length of the specified iucv message @msg of data | |
251 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
252 | * | |
253 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
254 | * data: | |
255 | * PRMDATA[0..6] socket data (max 7 bytes); | |
256 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
257 | * | |
25985edc | 258 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
259 | * value from 0xFF. |
260 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
261 | * notifications (see iucv_sock_shutdown); and further, | |
262 | * if the socket data len is > 7, the function returns 8. | |
263 | * | |
264 | * Use this function to allocate socket buffers to store iucv message data. | |
265 | */ | |
266 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
267 | { | |
268 | size_t datalen; | |
269 | ||
270 | if (msg->flags & IUCV_IPRMDATA) { | |
271 | datalen = 0xff - msg->rmmsg[7]; | |
272 | return (datalen < 8) ? datalen : 8; | |
273 | } | |
274 | return msg->length; | |
275 | } | |
276 | ||
0ea920d2 HB |
277 | /** |
278 | * iucv_sock_in_state() - check for specific states | |
279 | * @sk: sock structure | |
280 | * @state: first iucv sk state | |
281 | * @state: second iucv sk state | |
282 | * | |
283 | * Returns true if the socket in either in the first or second state. | |
284 | */ | |
285 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
286 | { | |
287 | return (sk->sk_state == state || sk->sk_state == state2); | |
288 | } | |
289 | ||
290 | /** | |
291 | * iucv_below_msglim() - function to check if messages can be sent | |
292 | * @sk: sock structure | |
293 | * | |
294 | * Returns true if the send queue length is lower than the message limit. | |
295 | * Always returns true if the socket is not connected (no iucv path for | |
296 | * checking the message limit). | |
297 | */ | |
298 | static inline int iucv_below_msglim(struct sock *sk) | |
299 | { | |
300 | struct iucv_sock *iucv = iucv_sk(sk); | |
301 | ||
302 | if (sk->sk_state != IUCV_CONNECTED) | |
303 | return 1; | |
3881ac44 UB |
304 | if (iucv->transport == AF_IUCV_TRANS_IUCV) |
305 | return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); | |
306 | else | |
307 | return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && | |
308 | (atomic_read(&iucv->pendings) <= 0)); | |
0ea920d2 HB |
309 | } |
310 | ||
311 | /** | |
312 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
313 | */ | |
314 | static void iucv_sock_wake_msglim(struct sock *sk) | |
315 | { | |
43815482 ED |
316 | struct socket_wq *wq; |
317 | ||
318 | rcu_read_lock(); | |
319 | wq = rcu_dereference(sk->sk_wq); | |
320 | if (wq_has_sleeper(wq)) | |
321 | wake_up_interruptible_all(&wq->wait); | |
0ea920d2 | 322 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 323 | rcu_read_unlock(); |
0ea920d2 HB |
324 | } |
325 | ||
3881ac44 UB |
326 | /** |
327 | * afiucv_hs_send() - send a message through HiperSockets transport | |
328 | */ | |
329 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
330 | struct sk_buff *skb, u8 flags) | |
331 | { | |
332 | struct net *net = sock_net(sock); | |
333 | struct iucv_sock *iucv = iucv_sk(sock); | |
334 | struct af_iucv_trans_hdr *phs_hdr; | |
335 | struct sk_buff *nskb; | |
336 | int err, confirm_recv = 0; | |
337 | ||
338 | memset(skb->head, 0, ETH_HLEN); | |
339 | phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, | |
340 | sizeof(struct af_iucv_trans_hdr)); | |
341 | skb_reset_mac_header(skb); | |
342 | skb_reset_network_header(skb); | |
343 | skb_push(skb, ETH_HLEN); | |
344 | skb_reset_mac_header(skb); | |
345 | memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); | |
346 | ||
347 | phs_hdr->magic = ETH_P_AF_IUCV; | |
348 | phs_hdr->version = 1; | |
349 | phs_hdr->flags = flags; | |
350 | if (flags == AF_IUCV_FLAG_SYN) | |
351 | phs_hdr->window = iucv->msglimit; | |
352 | else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { | |
353 | confirm_recv = atomic_read(&iucv->msg_recv); | |
354 | phs_hdr->window = confirm_recv; | |
355 | if (confirm_recv) | |
356 | phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; | |
357 | } | |
358 | memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); | |
359 | memcpy(phs_hdr->destAppName, iucv->dst_name, 8); | |
360 | memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); | |
361 | memcpy(phs_hdr->srcAppName, iucv->src_name, 8); | |
362 | ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); | |
363 | ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); | |
364 | ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); | |
365 | ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); | |
366 | if (imsg) | |
367 | memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); | |
368 | ||
369 | rcu_read_lock(); | |
370 | skb->dev = dev_get_by_index_rcu(net, sock->sk_bound_dev_if); | |
371 | rcu_read_unlock(); | |
372 | if (!skb->dev) | |
373 | return -ENODEV; | |
374 | if (!(skb->dev->flags & IFF_UP)) | |
375 | return -ENETDOWN; | |
376 | if (skb->len > skb->dev->mtu) { | |
377 | if (sock->sk_type == SOCK_SEQPACKET) | |
378 | return -EMSGSIZE; | |
379 | else | |
380 | skb_trim(skb, skb->dev->mtu); | |
381 | } | |
382 | skb->protocol = ETH_P_AF_IUCV; | |
383 | skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF; | |
384 | nskb = skb_clone(skb, GFP_ATOMIC); | |
385 | if (!nskb) | |
386 | return -ENOMEM; | |
387 | skb_queue_tail(&iucv->send_skb_q, nskb); | |
388 | err = dev_queue_xmit(skb); | |
389 | if (err) { | |
390 | skb_unlink(nskb, &iucv->send_skb_q); | |
391 | kfree_skb(nskb); | |
392 | } else { | |
393 | atomic_sub(confirm_recv, &iucv->msg_recv); | |
394 | WARN_ON(atomic_read(&iucv->msg_recv) < 0); | |
395 | } | |
396 | return err; | |
397 | } | |
398 | ||
eac3731b JH |
399 | /* Timers */ |
400 | static void iucv_sock_timeout(unsigned long arg) | |
401 | { | |
402 | struct sock *sk = (struct sock *)arg; | |
403 | ||
404 | bh_lock_sock(sk); | |
405 | sk->sk_err = ETIMEDOUT; | |
406 | sk->sk_state_change(sk); | |
407 | bh_unlock_sock(sk); | |
408 | ||
409 | iucv_sock_kill(sk); | |
410 | sock_put(sk); | |
411 | } | |
412 | ||
413 | static void iucv_sock_clear_timer(struct sock *sk) | |
414 | { | |
415 | sk_stop_timer(sk, &sk->sk_timer); | |
416 | } | |
417 | ||
eac3731b JH |
418 | static struct sock *__iucv_get_sock_by_name(char *nm) |
419 | { | |
420 | struct sock *sk; | |
421 | struct hlist_node *node; | |
422 | ||
423 | sk_for_each(sk, node, &iucv_sk_list.head) | |
424 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
425 | return sk; | |
426 | ||
427 | return NULL; | |
428 | } | |
429 | ||
430 | static void iucv_sock_destruct(struct sock *sk) | |
431 | { | |
432 | skb_queue_purge(&sk->sk_receive_queue); | |
433 | skb_queue_purge(&sk->sk_write_queue); | |
434 | } | |
435 | ||
436 | /* Cleanup Listen */ | |
437 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
438 | { | |
439 | struct sock *sk; | |
440 | ||
441 | /* Close non-accepted connections */ | |
442 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
443 | iucv_sock_close(sk); | |
444 | iucv_sock_kill(sk); | |
445 | } | |
446 | ||
447 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
448 | } |
449 | ||
7514bab0 | 450 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
451 | static void iucv_sock_kill(struct sock *sk) |
452 | { | |
453 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
454 | return; | |
455 | ||
456 | iucv_sock_unlink(&iucv_sk_list, sk); | |
457 | sock_set_flag(sk, SOCK_DEAD); | |
458 | sock_put(sk); | |
459 | } | |
460 | ||
461 | /* Close an IUCV socket */ | |
462 | static void iucv_sock_close(struct sock *sk) | |
463 | { | |
464 | unsigned char user_data[16]; | |
465 | struct iucv_sock *iucv = iucv_sk(sk); | |
561e0360 | 466 | unsigned long timeo; |
3881ac44 UB |
467 | int err, blen; |
468 | struct sk_buff *skb; | |
eac3731b JH |
469 | |
470 | iucv_sock_clear_timer(sk); | |
471 | lock_sock(sk); | |
472 | ||
da99f056 | 473 | switch (sk->sk_state) { |
eac3731b JH |
474 | case IUCV_LISTEN: |
475 | iucv_sock_cleanup_listen(sk); | |
476 | break; | |
477 | ||
478 | case IUCV_CONNECTED: | |
3881ac44 UB |
479 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
480 | /* send fin */ | |
481 | blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
482 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
483 | if (skb) { | |
484 | skb_reserve(skb, | |
485 | sizeof(struct af_iucv_trans_hdr) + | |
486 | ETH_HLEN); | |
487 | err = afiucv_hs_send(NULL, sk, skb, | |
488 | AF_IUCV_FLAG_FIN); | |
489 | } | |
490 | sk->sk_state = IUCV_DISCONN; | |
491 | sk->sk_state_change(sk); | |
492 | } | |
eac3731b | 493 | case IUCV_DISCONN: |
561e0360 JH |
494 | sk->sk_state = IUCV_CLOSING; |
495 | sk->sk_state_change(sk); | |
496 | ||
da99f056 | 497 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
498 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
499 | timeo = sk->sk_lingertime; | |
500 | else | |
501 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 502 | iucv_sock_wait(sk, |
0ea920d2 HB |
503 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
504 | timeo); | |
561e0360 JH |
505 | } |
506 | ||
bbe188c8 | 507 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
508 | sk->sk_state = IUCV_CLOSED; |
509 | sk->sk_state_change(sk); | |
510 | ||
eac3731b JH |
511 | if (iucv->path) { |
512 | low_nmcpy(user_data, iucv->src_name); | |
513 | high_nmcpy(user_data, iucv->dst_name); | |
514 | ASCEBC(user_data, sizeof(user_data)); | |
6fcd61f7 | 515 | pr_iucv->path_sever(iucv->path, user_data); |
eac3731b JH |
516 | iucv_path_free(iucv->path); |
517 | iucv->path = NULL; | |
518 | } | |
519 | ||
eac3731b JH |
520 | sk->sk_err = ECONNRESET; |
521 | sk->sk_state_change(sk); | |
522 | ||
523 | skb_queue_purge(&iucv->send_skb_q); | |
561e0360 | 524 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b JH |
525 | break; |
526 | ||
527 | default: | |
7514bab0 | 528 | /* nothing to do here */ |
eac3731b | 529 | break; |
3ff50b79 | 530 | } |
eac3731b | 531 | |
7514bab0 HB |
532 | /* mark socket for deletion by iucv_sock_kill() */ |
533 | sock_set_flag(sk, SOCK_ZAPPED); | |
534 | ||
eac3731b | 535 | release_sock(sk); |
eac3731b JH |
536 | } |
537 | ||
538 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
539 | { | |
540 | if (parent) | |
541 | sk->sk_type = parent->sk_type; | |
542 | } | |
543 | ||
544 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
545 | { | |
546 | struct sock *sk; | |
493d3971 | 547 | struct iucv_sock *iucv; |
eac3731b | 548 | |
6257ff21 | 549 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
550 | if (!sk) |
551 | return NULL; | |
493d3971 | 552 | iucv = iucv_sk(sk); |
eac3731b JH |
553 | |
554 | sock_init_data(sock, sk); | |
493d3971 UB |
555 | INIT_LIST_HEAD(&iucv->accept_q); |
556 | spin_lock_init(&iucv->accept_q_lock); | |
557 | skb_queue_head_init(&iucv->send_skb_q); | |
558 | INIT_LIST_HEAD(&iucv->message_q.list); | |
559 | spin_lock_init(&iucv->message_q.lock); | |
560 | skb_queue_head_init(&iucv->backlog_skb_q); | |
561 | iucv->send_tag = 0; | |
3881ac44 | 562 | atomic_set(&iucv->pendings, 0); |
493d3971 | 563 | iucv->flags = 0; |
3881ac44 UB |
564 | iucv->msglimit = 0; |
565 | atomic_set(&iucv->msg_sent, 0); | |
566 | atomic_set(&iucv->msg_recv, 0); | |
493d3971 | 567 | iucv->path = NULL; |
3881ac44 | 568 | iucv->sk_txnotify = afiucv_hs_callback_txnotify; |
493d3971 | 569 | memset(&iucv->src_user_id , 0, 32); |
3881ac44 UB |
570 | if (pr_iucv) |
571 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
572 | else | |
573 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
eac3731b JH |
574 | |
575 | sk->sk_destruct = iucv_sock_destruct; | |
576 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
577 | sk->sk_allocation = GFP_DMA; | |
578 | ||
579 | sock_reset_flag(sk, SOCK_ZAPPED); | |
580 | ||
581 | sk->sk_protocol = proto; | |
582 | sk->sk_state = IUCV_OPEN; | |
583 | ||
b24b8a24 | 584 | setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); |
eac3731b JH |
585 | |
586 | iucv_sock_link(&iucv_sk_list, sk); | |
587 | return sk; | |
588 | } | |
589 | ||
590 | /* Create an IUCV socket */ | |
3f378b68 EP |
591 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
592 | int kern) | |
eac3731b JH |
593 | { |
594 | struct sock *sk; | |
595 | ||
aa8e71f5 HB |
596 | if (protocol && protocol != PF_IUCV) |
597 | return -EPROTONOSUPPORT; | |
eac3731b JH |
598 | |
599 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
600 | |
601 | switch (sock->type) { | |
602 | case SOCK_STREAM: | |
603 | sock->ops = &iucv_sock_ops; | |
604 | break; | |
605 | case SOCK_SEQPACKET: | |
606 | /* currently, proto ops can handle both sk types */ | |
607 | sock->ops = &iucv_sock_ops; | |
608 | break; | |
609 | default: | |
610 | return -ESOCKTNOSUPPORT; | |
611 | } | |
eac3731b JH |
612 | |
613 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
614 | if (!sk) | |
615 | return -ENOMEM; | |
616 | ||
617 | iucv_sock_init(sk, NULL); | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
623 | { | |
624 | write_lock_bh(&l->lock); | |
625 | sk_add_node(sk, &l->head); | |
626 | write_unlock_bh(&l->lock); | |
627 | } | |
628 | ||
629 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
630 | { | |
631 | write_lock_bh(&l->lock); | |
632 | sk_del_node_init(sk); | |
633 | write_unlock_bh(&l->lock); | |
634 | } | |
635 | ||
636 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
637 | { | |
febca281 UB |
638 | unsigned long flags; |
639 | struct iucv_sock *par = iucv_sk(parent); | |
640 | ||
eac3731b | 641 | sock_hold(sk); |
febca281 UB |
642 | spin_lock_irqsave(&par->accept_q_lock, flags); |
643 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
644 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 645 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 646 | sk_acceptq_added(parent); |
eac3731b JH |
647 | } |
648 | ||
649 | void iucv_accept_unlink(struct sock *sk) | |
650 | { | |
febca281 UB |
651 | unsigned long flags; |
652 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
653 | ||
654 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 655 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 656 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 657 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
658 | iucv_sk(sk)->parent = NULL; |
659 | sock_put(sk); | |
660 | } | |
661 | ||
662 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
663 | { | |
664 | struct iucv_sock *isk, *n; | |
665 | struct sock *sk; | |
666 | ||
da99f056 | 667 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
668 | sk = (struct sock *) isk; |
669 | lock_sock(sk); | |
670 | ||
671 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 672 | iucv_accept_unlink(sk); |
febca281 | 673 | release_sock(sk); |
eac3731b JH |
674 | continue; |
675 | } | |
676 | ||
677 | if (sk->sk_state == IUCV_CONNECTED || | |
678 | sk->sk_state == IUCV_SEVERED || | |
56a73de3 | 679 | sk->sk_state == IUCV_DISCONN || /* due to PM restore */ |
eac3731b JH |
680 | !newsock) { |
681 | iucv_accept_unlink(sk); | |
682 | if (newsock) | |
683 | sock_graft(sk, newsock); | |
684 | ||
685 | if (sk->sk_state == IUCV_SEVERED) | |
686 | sk->sk_state = IUCV_DISCONN; | |
687 | ||
688 | release_sock(sk); | |
689 | return sk; | |
690 | } | |
691 | ||
692 | release_sock(sk); | |
693 | } | |
694 | return NULL; | |
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 */ | |
eac3731b | 729 | |
3881ac44 UB |
730 | if (pr_iucv) |
731 | if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) | |
732 | goto vm_bind; /* VM IUCV transport */ | |
eac3731b | 733 | |
3881ac44 UB |
734 | /* try hiper transport */ |
735 | memcpy(uid, sa->siucv_user_id, sizeof(uid)); | |
736 | ASCEBC(uid, 8); | |
737 | rcu_read_lock(); | |
738 | for_each_netdev_rcu(&init_net, dev) { | |
739 | if (!memcmp(dev->perm_addr, uid, 8)) { | |
740 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
741 | memcpy(iucv->src_user_id, sa->siucv_user_id, 8); | |
742 | sock->sk->sk_bound_dev_if = dev->ifindex; | |
743 | sk->sk_state = IUCV_BOUND; | |
744 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
745 | if (!iucv->msglimit) | |
746 | iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; | |
747 | rcu_read_unlock(); | |
748 | goto done_unlock; | |
749 | } | |
750 | } | |
751 | rcu_read_unlock(); | |
752 | vm_bind: | |
753 | if (pr_iucv) { | |
754 | /* use local userid for backward compat */ | |
755 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
756 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
757 | sk->sk_state = IUCV_BOUND; | |
758 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
759 | if (!iucv->msglimit) | |
760 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
761 | goto done_unlock; | |
762 | } | |
763 | /* found no dev to bind */ | |
764 | err = -ENODEV; | |
eac3731b JH |
765 | done_unlock: |
766 | /* Release the socket list lock */ | |
767 | write_unlock_bh(&iucv_sk_list.lock); | |
768 | done: | |
769 | release_sock(sk); | |
770 | return err; | |
771 | } | |
772 | ||
773 | /* Automatically bind an unbound socket */ | |
774 | static int iucv_sock_autobind(struct sock *sk) | |
775 | { | |
776 | struct iucv_sock *iucv = iucv_sk(sk); | |
777 | char query_buffer[80]; | |
778 | char name[12]; | |
779 | int err = 0; | |
780 | ||
781 | /* Set the userid and name */ | |
782 | cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); | |
783 | if (unlikely(err)) | |
784 | return -EPROTO; | |
785 | ||
786 | memcpy(iucv->src_user_id, query_buffer, 8); | |
787 | ||
788 | write_lock_bh(&iucv_sk_list.lock); | |
789 | ||
790 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
791 | while (__iucv_get_sock_by_name(name)) { | |
792 | sprintf(name, "%08x", | |
793 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
794 | } | |
795 | ||
796 | write_unlock_bh(&iucv_sk_list.lock); | |
797 | ||
798 | memcpy(&iucv->src_name, name, 8); | |
799 | ||
3881ac44 UB |
800 | if (!iucv->msglimit) |
801 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
802 | ||
eac3731b JH |
803 | return err; |
804 | } | |
805 | ||
3881ac44 UB |
806 | static int afiucv_hs_connect(struct socket *sock) |
807 | { | |
808 | struct sock *sk = sock->sk; | |
809 | struct sk_buff *skb; | |
810 | int blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
811 | int err = 0; | |
812 | ||
813 | /* send syn */ | |
814 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
815 | if (!skb) { | |
816 | err = -ENOMEM; | |
817 | goto done; | |
818 | } | |
819 | skb->dev = NULL; | |
820 | skb_reserve(skb, blen); | |
821 | err = afiucv_hs_send(NULL, sk, skb, AF_IUCV_FLAG_SYN); | |
822 | done: | |
823 | return err; | |
824 | } | |
825 | ||
826 | static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) | |
eac3731b JH |
827 | { |
828 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
829 | struct sock *sk = sock->sk; | |
493d3971 | 830 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
831 | unsigned char user_data[16]; |
832 | int err; | |
833 | ||
eac3731b | 834 | high_nmcpy(user_data, sa->siucv_name); |
493d3971 | 835 | low_nmcpy(user_data, iucv->src_name); |
eac3731b JH |
836 | ASCEBC(user_data, sizeof(user_data)); |
837 | ||
eac3731b | 838 | /* Create path. */ |
09488e2e | 839 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 840 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
841 | if (!iucv->path) { |
842 | err = -ENOMEM; | |
843 | goto done; | |
844 | } | |
6fcd61f7 FB |
845 | err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
846 | sa->siucv_user_id, NULL, user_data, | |
847 | sk); | |
eac3731b JH |
848 | if (err) { |
849 | iucv_path_free(iucv->path); | |
850 | iucv->path = NULL; | |
55cdea9e HB |
851 | switch (err) { |
852 | case 0x0b: /* Target communicator is not logged on */ | |
853 | err = -ENETUNREACH; | |
854 | break; | |
855 | case 0x0d: /* Max connections for this guest exceeded */ | |
856 | case 0x0e: /* Max connections for target guest exceeded */ | |
857 | err = -EAGAIN; | |
858 | break; | |
859 | case 0x0f: /* Missing IUCV authorization */ | |
860 | err = -EACCES; | |
861 | break; | |
862 | default: | |
863 | err = -ECONNREFUSED; | |
864 | break; | |
865 | } | |
eac3731b | 866 | } |
3881ac44 UB |
867 | done: |
868 | return err; | |
869 | } | |
eac3731b | 870 | |
3881ac44 UB |
871 | /* Connect an unconnected socket */ |
872 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
873 | int alen, int flags) | |
874 | { | |
875 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
876 | struct sock *sk = sock->sk; | |
877 | struct iucv_sock *iucv = iucv_sk(sk); | |
878 | int err; | |
879 | ||
880 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
881 | return -EINVAL; | |
882 | ||
883 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
884 | return -EBADFD; | |
885 | ||
886 | if (sk->sk_state == IUCV_OPEN && | |
887 | iucv->transport == AF_IUCV_TRANS_HIPER) | |
888 | return -EBADFD; /* explicit bind required */ | |
889 | ||
890 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) | |
891 | return -EINVAL; | |
892 | ||
893 | if (sk->sk_state == IUCV_OPEN) { | |
894 | err = iucv_sock_autobind(sk); | |
895 | if (unlikely(err)) | |
896 | return err; | |
897 | } | |
898 | ||
899 | lock_sock(sk); | |
900 | ||
901 | /* Set the destination information */ | |
902 | memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); | |
903 | memcpy(iucv->dst_name, sa->siucv_name, 8); | |
904 | ||
905 | if (iucv->transport == AF_IUCV_TRANS_HIPER) | |
906 | err = afiucv_hs_connect(sock); | |
907 | else | |
908 | err = afiucv_path_connect(sock, addr); | |
909 | if (err) | |
910 | goto done; | |
911 | ||
912 | if (sk->sk_state != IUCV_CONNECTED) | |
0ea920d2 HB |
913 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
914 | IUCV_DISCONN), | |
915 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b | 916 | |
3881ac44 | 917 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
b8942e3b | 918 | err = -ECONNREFUSED; |
18becbc5 | 919 | |
3881ac44 | 920 | if (err && iucv->transport == AF_IUCV_TRANS_IUCV) { |
6fcd61f7 | 921 | pr_iucv->path_sever(iucv->path, NULL); |
18becbc5 UB |
922 | iucv_path_free(iucv->path); |
923 | iucv->path = NULL; | |
924 | } | |
925 | ||
eac3731b JH |
926 | done: |
927 | release_sock(sk); | |
928 | return err; | |
929 | } | |
930 | ||
931 | /* Move a socket into listening state. */ | |
932 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
933 | { | |
934 | struct sock *sk = sock->sk; | |
935 | int err; | |
936 | ||
937 | lock_sock(sk); | |
938 | ||
939 | err = -EINVAL; | |
aa8e71f5 HB |
940 | if (sk->sk_state != IUCV_BOUND) |
941 | goto done; | |
942 | ||
943 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
944 | goto done; |
945 | ||
946 | sk->sk_max_ack_backlog = backlog; | |
947 | sk->sk_ack_backlog = 0; | |
948 | sk->sk_state = IUCV_LISTEN; | |
949 | err = 0; | |
950 | ||
951 | done: | |
952 | release_sock(sk); | |
953 | return err; | |
954 | } | |
955 | ||
956 | /* Accept a pending connection */ | |
957 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
958 | int flags) | |
959 | { | |
960 | DECLARE_WAITQUEUE(wait, current); | |
961 | struct sock *sk = sock->sk, *nsk; | |
962 | long timeo; | |
963 | int err = 0; | |
964 | ||
561e0360 | 965 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
966 | |
967 | if (sk->sk_state != IUCV_LISTEN) { | |
968 | err = -EBADFD; | |
969 | goto done; | |
970 | } | |
971 | ||
972 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
973 | ||
974 | /* Wait for an incoming connection */ | |
aa395145 | 975 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 976 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
977 | set_current_state(TASK_INTERRUPTIBLE); |
978 | if (!timeo) { | |
979 | err = -EAGAIN; | |
980 | break; | |
981 | } | |
982 | ||
983 | release_sock(sk); | |
984 | timeo = schedule_timeout(timeo); | |
561e0360 | 985 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
986 | |
987 | if (sk->sk_state != IUCV_LISTEN) { | |
988 | err = -EBADFD; | |
989 | break; | |
990 | } | |
991 | ||
992 | if (signal_pending(current)) { | |
993 | err = sock_intr_errno(timeo); | |
994 | break; | |
995 | } | |
996 | } | |
997 | ||
998 | set_current_state(TASK_RUNNING); | |
aa395145 | 999 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
1000 | |
1001 | if (err) | |
1002 | goto done; | |
1003 | ||
1004 | newsock->state = SS_CONNECTED; | |
1005 | ||
1006 | done: | |
1007 | release_sock(sk); | |
1008 | return err; | |
1009 | } | |
1010 | ||
1011 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
1012 | int *len, int peer) | |
1013 | { | |
1014 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
1015 | struct sock *sk = sock->sk; | |
493d3971 | 1016 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
1017 | |
1018 | addr->sa_family = AF_IUCV; | |
1019 | *len = sizeof(struct sockaddr_iucv); | |
1020 | ||
1021 | if (peer) { | |
493d3971 UB |
1022 | memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
1023 | memcpy(siucv->siucv_name, iucv->dst_name, 8); | |
eac3731b | 1024 | } else { |
493d3971 UB |
1025 | memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
1026 | memcpy(siucv->siucv_name, iucv->src_name, 8); | |
eac3731b JH |
1027 | } |
1028 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
1029 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
493d3971 | 1030 | memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
eac3731b JH |
1031 | |
1032 | return 0; | |
1033 | } | |
1034 | ||
b8942e3b HB |
1035 | /** |
1036 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
1037 | * @path: IUCV path | |
1038 | * @msg: Pointer to a struct iucv_message | |
1039 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
1040 | * | |
1041 | * Send the socket data in the parameter list in the iucv message | |
1042 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
1043 | * list and the socket data len at index 7 (last byte). | |
1044 | * See also iucv_msg_length(). | |
1045 | * | |
1046 | * Returns the error code from the iucv_message_send() call. | |
1047 | */ | |
1048 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
1049 | struct sk_buff *skb) | |
1050 | { | |
1051 | u8 prmdata[8]; | |
1052 | ||
1053 | memcpy(prmdata, (void *) skb->data, skb->len); | |
1054 | prmdata[7] = 0xff - (u8) skb->len; | |
6fcd61f7 | 1055 | return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
b8942e3b HB |
1056 | (void *) prmdata, 8); |
1057 | } | |
1058 | ||
eac3731b JH |
1059 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1060 | struct msghdr *msg, size_t len) | |
1061 | { | |
1062 | struct sock *sk = sock->sk; | |
1063 | struct iucv_sock *iucv = iucv_sk(sk); | |
1064 | struct sk_buff *skb; | |
1065 | struct iucv_message txmsg; | |
44b1e6b5 HB |
1066 | struct cmsghdr *cmsg; |
1067 | int cmsg_done; | |
0ea920d2 | 1068 | long timeo; |
8f7c502c UB |
1069 | char user_id[9]; |
1070 | char appl_id[9]; | |
eac3731b | 1071 | int err; |
0ea920d2 | 1072 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
1073 | |
1074 | err = sock_error(sk); | |
1075 | if (err) | |
1076 | return err; | |
1077 | ||
1078 | if (msg->msg_flags & MSG_OOB) | |
1079 | return -EOPNOTSUPP; | |
1080 | ||
aa8e71f5 HB |
1081 | /* SOCK_SEQPACKET: we do not support segmented records */ |
1082 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
1083 | return -EOPNOTSUPP; | |
1084 | ||
eac3731b JH |
1085 | lock_sock(sk); |
1086 | ||
1087 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1088 | err = -EPIPE; | |
1089 | goto out; | |
1090 | } | |
1091 | ||
bb664f49 HB |
1092 | /* Return if the socket is not in connected state */ |
1093 | if (sk->sk_state != IUCV_CONNECTED) { | |
1094 | err = -ENOTCONN; | |
1095 | goto out; | |
1096 | } | |
44b1e6b5 | 1097 | |
bb664f49 HB |
1098 | /* initialize defaults */ |
1099 | cmsg_done = 0; /* check for duplicate headers */ | |
1100 | txmsg.class = 0; | |
44b1e6b5 | 1101 | |
bb664f49 HB |
1102 | /* iterate over control messages */ |
1103 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; | |
1104 | cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
44b1e6b5 | 1105 | |
bb664f49 HB |
1106 | if (!CMSG_OK(msg, cmsg)) { |
1107 | err = -EINVAL; | |
1108 | goto out; | |
1109 | } | |
44b1e6b5 | 1110 | |
bb664f49 HB |
1111 | if (cmsg->cmsg_level != SOL_IUCV) |
1112 | continue; | |
44b1e6b5 | 1113 | |
bb664f49 HB |
1114 | if (cmsg->cmsg_type & cmsg_done) { |
1115 | err = -EINVAL; | |
1116 | goto out; | |
1117 | } | |
1118 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 1119 | |
bb664f49 HB |
1120 | switch (cmsg->cmsg_type) { |
1121 | case SCM_IUCV_TRGCLS: | |
1122 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
1123 | err = -EINVAL; |
1124 | goto out; | |
1125 | } | |
44b1e6b5 | 1126 | |
bb664f49 HB |
1127 | /* set iucv message target class */ |
1128 | memcpy(&txmsg.class, | |
1129 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 1130 | |
bb664f49 | 1131 | break; |
44b1e6b5 | 1132 | |
bb664f49 HB |
1133 | default: |
1134 | err = -EINVAL; | |
1135 | goto out; | |
1136 | break; | |
44b1e6b5 | 1137 | } |
bb664f49 | 1138 | } |
44b1e6b5 | 1139 | |
bb664f49 HB |
1140 | /* allocate one skb for each iucv message: |
1141 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
1142 | * segmented records using the MSG_EOR flag), but | |
1143 | * for SOCK_STREAM we might want to improve it in future */ | |
3881ac44 UB |
1144 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1145 | skb = sock_alloc_send_skb(sk, | |
1146 | len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, | |
1147 | noblock, &err); | |
1148 | else | |
1149 | skb = sock_alloc_send_skb(sk, len, noblock, &err); | |
bb664f49 HB |
1150 | if (!skb) |
1151 | goto out; | |
3881ac44 UB |
1152 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1153 | skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); | |
bb664f49 HB |
1154 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
1155 | err = -EFAULT; | |
1156 | goto fail; | |
1157 | } | |
eac3731b | 1158 | |
0ea920d2 HB |
1159 | /* wait if outstanding messages for iucv path has reached */ |
1160 | timeo = sock_sndtimeo(sk, noblock); | |
1161 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
1162 | if (err) | |
1163 | goto fail; | |
eac3731b | 1164 | |
0ea920d2 HB |
1165 | /* return -ECONNRESET if the socket is no longer connected */ |
1166 | if (sk->sk_state != IUCV_CONNECTED) { | |
1167 | err = -ECONNRESET; | |
1168 | goto fail; | |
1169 | } | |
b8942e3b | 1170 | |
bb664f49 HB |
1171 | /* increment and save iucv message tag for msg_completion cbk */ |
1172 | txmsg.tag = iucv->send_tag++; | |
1173 | memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); | |
3881ac44 UB |
1174 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1175 | atomic_inc(&iucv->msg_sent); | |
1176 | err = afiucv_hs_send(&txmsg, sk, skb, 0); | |
1177 | if (err) { | |
1178 | atomic_dec(&iucv->msg_sent); | |
1179 | goto fail; | |
1180 | } | |
1181 | goto release; | |
1182 | } | |
bb664f49 | 1183 | skb_queue_tail(&iucv->send_skb_q, skb); |
b8942e3b | 1184 | |
bb664f49 HB |
1185 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
1186 | && skb->len <= 7) { | |
1187 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 1188 | |
bb664f49 HB |
1189 | /* on success: there is no message_complete callback |
1190 | * for an IPRMDATA msg; remove skb from send queue */ | |
1191 | if (err == 0) { | |
1192 | skb_unlink(skb, &iucv->send_skb_q); | |
1193 | kfree_skb(skb); | |
1194 | } | |
1195 | ||
1196 | /* this error should never happen since the | |
1197 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1198 | if (err == 0x15) { | |
6fcd61f7 | 1199 | pr_iucv->path_sever(iucv->path, NULL); |
eac3731b JH |
1200 | skb_unlink(skb, &iucv->send_skb_q); |
1201 | err = -EPIPE; | |
1202 | goto fail; | |
1203 | } | |
bb664f49 | 1204 | } else |
6fcd61f7 | 1205 | err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, |
bb664f49 HB |
1206 | (void *) skb->data, skb->len); |
1207 | if (err) { | |
1208 | if (err == 3) { | |
1209 | user_id[8] = 0; | |
1210 | memcpy(user_id, iucv->dst_user_id, 8); | |
1211 | appl_id[8] = 0; | |
1212 | memcpy(appl_id, iucv->dst_name, 8); | |
1213 | pr_err("Application %s on z/VM guest %s" | |
1214 | " exceeds message limit\n", | |
1215 | appl_id, user_id); | |
0ea920d2 HB |
1216 | err = -EAGAIN; |
1217 | } else | |
1218 | err = -EPIPE; | |
bb664f49 | 1219 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1220 | goto fail; |
eac3731b JH |
1221 | } |
1222 | ||
3881ac44 | 1223 | release: |
eac3731b JH |
1224 | release_sock(sk); |
1225 | return len; | |
1226 | ||
1227 | fail: | |
1228 | kfree_skb(skb); | |
1229 | out: | |
1230 | release_sock(sk); | |
1231 | return err; | |
1232 | } | |
1233 | ||
bf95d20f HB |
1234 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1235 | * | |
1236 | * Locking: must be called with message_q.lock held | |
1237 | */ | |
f0703c80 UB |
1238 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1239 | { | |
1240 | int dataleft, size, copied = 0; | |
1241 | struct sk_buff *nskb; | |
1242 | ||
1243 | dataleft = len; | |
1244 | while (dataleft) { | |
1245 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1246 | size = sk->sk_rcvbuf / 4; | |
1247 | else | |
1248 | size = dataleft; | |
1249 | ||
1250 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1251 | if (!nskb) | |
1252 | return -ENOMEM; | |
1253 | ||
44b1e6b5 HB |
1254 | /* copy target class to control buffer of new skb */ |
1255 | memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); | |
1256 | ||
1257 | /* copy data fragment */ | |
f0703c80 UB |
1258 | memcpy(nskb->data, skb->data + copied, size); |
1259 | copied += size; | |
1260 | dataleft -= size; | |
1261 | ||
1262 | skb_reset_transport_header(nskb); | |
1263 | skb_reset_network_header(nskb); | |
1264 | nskb->len = size; | |
1265 | ||
1266 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1267 | } | |
1268 | ||
1269 | return 0; | |
1270 | } | |
1271 | ||
bf95d20f HB |
1272 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1273 | * | |
1274 | * Locking: must be called with message_q.lock held | |
1275 | */ | |
f0703c80 UB |
1276 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1277 | struct iucv_path *path, | |
1278 | struct iucv_message *msg) | |
1279 | { | |
1280 | int rc; | |
b8942e3b HB |
1281 | unsigned int len; |
1282 | ||
1283 | len = iucv_msg_length(msg); | |
f0703c80 | 1284 | |
44b1e6b5 HB |
1285 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1286 | /* Note: the first 4 bytes are reserved for msg tag */ | |
1287 | memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); | |
1288 | ||
b8942e3b HB |
1289 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1290 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1291 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1292 | skb->data = NULL; | |
1293 | skb->len = 0; | |
1294 | } | |
f0703c80 | 1295 | } else { |
6fcd61f7 FB |
1296 | rc = pr_iucv->message_receive(path, msg, |
1297 | msg->flags & IUCV_IPRMDATA, | |
1298 | skb->data, len, NULL); | |
f0703c80 UB |
1299 | if (rc) { |
1300 | kfree_skb(skb); | |
1301 | return; | |
1302 | } | |
aa8e71f5 HB |
1303 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1304 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1305 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1306 | if (sk->sk_type == SOCK_STREAM && | |
1307 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1308 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1309 | kfree_skb(skb); |
1310 | skb = NULL; | |
1311 | if (rc) { | |
6fcd61f7 | 1312 | pr_iucv->path_sever(path, NULL); |
f0703c80 UB |
1313 | return; |
1314 | } | |
1315 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1316 | } else { | |
1317 | skb_reset_transport_header(skb); | |
1318 | skb_reset_network_header(skb); | |
b8942e3b | 1319 | skb->len = len; |
f0703c80 UB |
1320 | } |
1321 | } | |
1322 | ||
1323 | if (sock_queue_rcv_skb(sk, skb)) | |
1324 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1325 | } | |
1326 | ||
bf95d20f HB |
1327 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1328 | * | |
1329 | * Locking: must be called with message_q.lock held | |
1330 | */ | |
f0703c80 UB |
1331 | static void iucv_process_message_q(struct sock *sk) |
1332 | { | |
1333 | struct iucv_sock *iucv = iucv_sk(sk); | |
1334 | struct sk_buff *skb; | |
1335 | struct sock_msg_q *p, *n; | |
1336 | ||
1337 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1338 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1339 | if (!skb) |
1340 | break; | |
1341 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1342 | list_del(&p->list); | |
1343 | kfree(p); | |
1344 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1345 | break; | |
1346 | } | |
1347 | } | |
1348 | ||
eac3731b JH |
1349 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1350 | struct msghdr *msg, size_t len, int flags) | |
1351 | { | |
1352 | int noblock = flags & MSG_DONTWAIT; | |
1353 | struct sock *sk = sock->sk; | |
561e0360 | 1354 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1355 | unsigned int copied, rlen; |
3881ac44 UB |
1356 | struct sk_buff *skb, *rskb, *cskb, *sskb; |
1357 | int blen; | |
eac3731b JH |
1358 | int err = 0; |
1359 | ||
561e0360 | 1360 | if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && |
f0703c80 UB |
1361 | skb_queue_empty(&iucv->backlog_skb_q) && |
1362 | skb_queue_empty(&sk->sk_receive_queue) && | |
1363 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1364 | return 0; |
1365 | ||
eac3731b JH |
1366 | if (flags & (MSG_OOB)) |
1367 | return -EOPNOTSUPP; | |
1368 | ||
60d3705f HB |
1369 | /* receive/dequeue next skb: |
1370 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1371 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1372 | if (!skb) { | |
1373 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1374 | return 0; | |
1375 | return err; | |
1376 | } | |
1377 | ||
aa8e71f5 HB |
1378 | rlen = skb->len; /* real length of skb */ |
1379 | copied = min_t(unsigned int, rlen, len); | |
eac3731b | 1380 | |
561e0360 | 1381 | cskb = skb; |
3881ac44 | 1382 | if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { |
802788bf HB |
1383 | if (!(flags & MSG_PEEK)) |
1384 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1385 | return -EFAULT; | |
eac3731b JH |
1386 | } |
1387 | ||
aa8e71f5 HB |
1388 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1389 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1390 | if (copied < rlen) | |
1391 | msg->msg_flags |= MSG_TRUNC; | |
1392 | /* each iucv message contains a complete record */ | |
1393 | msg->msg_flags |= MSG_EOR; | |
1394 | } | |
eac3731b | 1395 | |
44b1e6b5 HB |
1396 | /* create control message to store iucv msg target class: |
1397 | * get the trgcls from the control buffer of the skb due to | |
1398 | * fragmentation of original iucv message. */ | |
1399 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
1400 | CB_TRGCLS_LEN, CB_TRGCLS(skb)); | |
1401 | if (err) { | |
1402 | if (!(flags & MSG_PEEK)) | |
1403 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1404 | return err; | |
1405 | } | |
1406 | ||
eac3731b JH |
1407 | /* Mark read part of skb as used */ |
1408 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1409 | |
aa8e71f5 HB |
1410 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1411 | if (sk->sk_type == SOCK_STREAM) { | |
1412 | skb_pull(skb, copied); | |
1413 | if (skb->len) { | |
1414 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1415 | goto done; | |
1416 | } | |
eac3731b JH |
1417 | } |
1418 | ||
1419 | kfree_skb(skb); | |
3881ac44 | 1420 | atomic_inc(&iucv->msg_recv); |
561e0360 JH |
1421 | |
1422 | /* Queue backlog skbs */ | |
bf95d20f | 1423 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1424 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1425 | while (rskb) { |
561e0360 | 1426 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1427 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1428 | rskb); |
1429 | break; | |
1430 | } else { | |
f0703c80 | 1431 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1432 | } |
1433 | } | |
f0703c80 | 1434 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1435 | if (!list_empty(&iucv->message_q.list)) |
1436 | iucv_process_message_q(sk); | |
3881ac44 UB |
1437 | if (atomic_read(&iucv->msg_recv) >= |
1438 | iucv->msglimit / 2) { | |
1439 | /* send WIN to peer */ | |
1440 | blen = sizeof(struct af_iucv_trans_hdr) + | |
1441 | ETH_HLEN; | |
1442 | sskb = sock_alloc_send_skb(sk, blen, 1, &err); | |
1443 | if (sskb) { | |
1444 | skb_reserve(sskb, | |
1445 | sizeof(struct af_iucv_trans_hdr) | |
1446 | + ETH_HLEN); | |
1447 | err = afiucv_hs_send(NULL, sk, sskb, | |
1448 | AF_IUCV_FLAG_WIN); | |
1449 | } | |
1450 | if (err) { | |
1451 | sk->sk_state = IUCV_DISCONN; | |
1452 | sk->sk_state_change(sk); | |
1453 | } | |
1454 | } | |
f0703c80 | 1455 | } |
bf95d20f | 1456 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1457 | } |
eac3731b JH |
1458 | |
1459 | done: | |
aa8e71f5 HB |
1460 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1461 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1462 | copied = rlen; | |
1463 | ||
1464 | return copied; | |
eac3731b JH |
1465 | } |
1466 | ||
1467 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1468 | { | |
1469 | struct iucv_sock *isk, *n; | |
1470 | struct sock *sk; | |
1471 | ||
da99f056 | 1472 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1473 | sk = (struct sock *) isk; |
1474 | ||
1475 | if (sk->sk_state == IUCV_CONNECTED) | |
1476 | return POLLIN | POLLRDNORM; | |
1477 | } | |
1478 | ||
1479 | return 0; | |
1480 | } | |
1481 | ||
1482 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1483 | poll_table *wait) | |
1484 | { | |
1485 | struct sock *sk = sock->sk; | |
1486 | unsigned int mask = 0; | |
1487 | ||
aa395145 | 1488 | sock_poll_wait(file, sk_sleep(sk), wait); |
eac3731b JH |
1489 | |
1490 | if (sk->sk_state == IUCV_LISTEN) | |
1491 | return iucv_accept_poll(sk); | |
1492 | ||
1493 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
1494 | mask |= POLLERR; | |
1495 | ||
1496 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1497 | mask |= POLLRDHUP; | |
1498 | ||
1499 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1500 | mask |= POLLHUP; | |
1501 | ||
1502 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1503 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1504 | mask |= POLLIN | POLLRDNORM; |
1505 | ||
1506 | if (sk->sk_state == IUCV_CLOSED) | |
1507 | mask |= POLLHUP; | |
1508 | ||
561e0360 JH |
1509 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) |
1510 | mask |= POLLIN; | |
1511 | ||
eac3731b JH |
1512 | if (sock_writeable(sk)) |
1513 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1514 | else | |
1515 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1516 | ||
1517 | return mask; | |
1518 | } | |
1519 | ||
1520 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1521 | { | |
1522 | struct sock *sk = sock->sk; | |
1523 | struct iucv_sock *iucv = iucv_sk(sk); | |
1524 | struct iucv_message txmsg; | |
1525 | int err = 0; | |
eac3731b JH |
1526 | |
1527 | how++; | |
1528 | ||
1529 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1530 | return -EINVAL; | |
1531 | ||
1532 | lock_sock(sk); | |
da99f056 | 1533 | switch (sk->sk_state) { |
e14ad5fa HB |
1534 | case IUCV_DISCONN: |
1535 | case IUCV_CLOSING: | |
1536 | case IUCV_SEVERED: | |
eac3731b JH |
1537 | case IUCV_CLOSED: |
1538 | err = -ENOTCONN; | |
1539 | goto fail; | |
1540 | ||
1541 | default: | |
1542 | sk->sk_shutdown |= how; | |
1543 | break; | |
1544 | } | |
1545 | ||
1546 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1547 | txmsg.class = 0; | |
1548 | txmsg.tag = 0; | |
6fcd61f7 FB |
1549 | err = pr_iucv->message_send(iucv->path, &txmsg, IUCV_IPRMDATA, |
1550 | 0, (void *) iprm_shutdown, 8); | |
eac3731b | 1551 | if (err) { |
da99f056 | 1552 | switch (err) { |
eac3731b JH |
1553 | case 1: |
1554 | err = -ENOTCONN; | |
1555 | break; | |
1556 | case 2: | |
1557 | err = -ECONNRESET; | |
1558 | break; | |
1559 | default: | |
1560 | err = -ENOTCONN; | |
1561 | break; | |
1562 | } | |
1563 | } | |
1564 | } | |
1565 | ||
1566 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
6fcd61f7 | 1567 | err = pr_iucv->path_quiesce(iucv->path, NULL); |
eac3731b JH |
1568 | if (err) |
1569 | err = -ENOTCONN; | |
1570 | ||
1571 | skb_queue_purge(&sk->sk_receive_queue); | |
1572 | } | |
1573 | ||
1574 | /* Wake up anyone sleeping in poll */ | |
1575 | sk->sk_state_change(sk); | |
1576 | ||
1577 | fail: | |
1578 | release_sock(sk); | |
1579 | return err; | |
1580 | } | |
1581 | ||
1582 | static int iucv_sock_release(struct socket *sock) | |
1583 | { | |
1584 | struct sock *sk = sock->sk; | |
1585 | int err = 0; | |
1586 | ||
1587 | if (!sk) | |
1588 | return 0; | |
1589 | ||
1590 | iucv_sock_close(sk); | |
1591 | ||
1592 | /* Unregister with IUCV base support */ | |
1593 | if (iucv_sk(sk)->path) { | |
6fcd61f7 | 1594 | pr_iucv->path_sever(iucv_sk(sk)->path, NULL); |
eac3731b JH |
1595 | iucv_path_free(iucv_sk(sk)->path); |
1596 | iucv_sk(sk)->path = NULL; | |
1597 | } | |
1598 | ||
eac3731b JH |
1599 | sock_orphan(sk); |
1600 | iucv_sock_kill(sk); | |
1601 | return err; | |
1602 | } | |
1603 | ||
9d5c5d8f HB |
1604 | /* getsockopt and setsockopt */ |
1605 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1606 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1607 | { |
1608 | struct sock *sk = sock->sk; | |
1609 | struct iucv_sock *iucv = iucv_sk(sk); | |
1610 | int val; | |
1611 | int rc; | |
1612 | ||
1613 | if (level != SOL_IUCV) | |
1614 | return -ENOPROTOOPT; | |
1615 | ||
1616 | if (optlen < sizeof(int)) | |
1617 | return -EINVAL; | |
1618 | ||
1619 | if (get_user(val, (int __user *) optval)) | |
1620 | return -EFAULT; | |
1621 | ||
1622 | rc = 0; | |
1623 | ||
1624 | lock_sock(sk); | |
1625 | switch (optname) { | |
1626 | case SO_IPRMDATA_MSG: | |
1627 | if (val) | |
1628 | iucv->flags |= IUCV_IPRMDATA; | |
1629 | else | |
1630 | iucv->flags &= ~IUCV_IPRMDATA; | |
1631 | break; | |
09488e2e HB |
1632 | case SO_MSGLIMIT: |
1633 | switch (sk->sk_state) { | |
1634 | case IUCV_OPEN: | |
1635 | case IUCV_BOUND: | |
1636 | if (val < 1 || val > (u16)(~0)) | |
1637 | rc = -EINVAL; | |
1638 | else | |
1639 | iucv->msglimit = val; | |
1640 | break; | |
1641 | default: | |
1642 | rc = -EINVAL; | |
1643 | break; | |
1644 | } | |
1645 | break; | |
9d5c5d8f HB |
1646 | default: |
1647 | rc = -ENOPROTOOPT; | |
1648 | break; | |
1649 | } | |
1650 | release_sock(sk); | |
1651 | ||
1652 | return rc; | |
1653 | } | |
1654 | ||
1655 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1656 | char __user *optval, int __user *optlen) | |
1657 | { | |
1658 | struct sock *sk = sock->sk; | |
1659 | struct iucv_sock *iucv = iucv_sk(sk); | |
1660 | int val, len; | |
1661 | ||
1662 | if (level != SOL_IUCV) | |
1663 | return -ENOPROTOOPT; | |
1664 | ||
1665 | if (get_user(len, optlen)) | |
1666 | return -EFAULT; | |
1667 | ||
1668 | if (len < 0) | |
1669 | return -EINVAL; | |
1670 | ||
1671 | len = min_t(unsigned int, len, sizeof(int)); | |
1672 | ||
1673 | switch (optname) { | |
1674 | case SO_IPRMDATA_MSG: | |
1675 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1676 | break; | |
09488e2e HB |
1677 | case SO_MSGLIMIT: |
1678 | lock_sock(sk); | |
1679 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1680 | : iucv->msglimit; /* default */ | |
1681 | release_sock(sk); | |
1682 | break; | |
9d5c5d8f HB |
1683 | default: |
1684 | return -ENOPROTOOPT; | |
1685 | } | |
1686 | ||
1687 | if (put_user(len, optlen)) | |
1688 | return -EFAULT; | |
1689 | if (copy_to_user(optval, &val, len)) | |
1690 | return -EFAULT; | |
1691 | ||
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | ||
eac3731b JH |
1696 | /* Callback wrappers - called from iucv base support */ |
1697 | static int iucv_callback_connreq(struct iucv_path *path, | |
1698 | u8 ipvmid[8], u8 ipuser[16]) | |
1699 | { | |
1700 | unsigned char user_data[16]; | |
1701 | unsigned char nuser_data[16]; | |
1702 | unsigned char src_name[8]; | |
1703 | struct hlist_node *node; | |
1704 | struct sock *sk, *nsk; | |
1705 | struct iucv_sock *iucv, *niucv; | |
1706 | int err; | |
1707 | ||
1708 | memcpy(src_name, ipuser, 8); | |
1709 | EBCASC(src_name, 8); | |
1710 | /* Find out if this path belongs to af_iucv. */ | |
1711 | read_lock(&iucv_sk_list.lock); | |
1712 | iucv = NULL; | |
febca281 | 1713 | sk = NULL; |
eac3731b JH |
1714 | sk_for_each(sk, node, &iucv_sk_list.head) |
1715 | if (sk->sk_state == IUCV_LISTEN && | |
1716 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1717 | /* | |
1718 | * Found a listening socket with | |
1719 | * src_name == ipuser[0-7]. | |
1720 | */ | |
1721 | iucv = iucv_sk(sk); | |
1722 | break; | |
1723 | } | |
1724 | read_unlock(&iucv_sk_list.lock); | |
1725 | if (!iucv) | |
1726 | /* No socket found, not one of our paths. */ | |
1727 | return -EINVAL; | |
1728 | ||
1729 | bh_lock_sock(sk); | |
1730 | ||
1731 | /* Check if parent socket is listening */ | |
1732 | low_nmcpy(user_data, iucv->src_name); | |
1733 | high_nmcpy(user_data, iucv->dst_name); | |
1734 | ASCEBC(user_data, sizeof(user_data)); | |
1735 | if (sk->sk_state != IUCV_LISTEN) { | |
6fcd61f7 | 1736 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1737 | iucv_path_free(path); |
eac3731b JH |
1738 | goto fail; |
1739 | } | |
1740 | ||
1741 | /* Check for backlog size */ | |
1742 | if (sk_acceptq_is_full(sk)) { | |
6fcd61f7 | 1743 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1744 | iucv_path_free(path); |
eac3731b JH |
1745 | goto fail; |
1746 | } | |
1747 | ||
1748 | /* Create the new socket */ | |
aa8e71f5 | 1749 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
da99f056 | 1750 | if (!nsk) { |
6fcd61f7 | 1751 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1752 | iucv_path_free(path); |
eac3731b JH |
1753 | goto fail; |
1754 | } | |
1755 | ||
1756 | niucv = iucv_sk(nsk); | |
1757 | iucv_sock_init(nsk, sk); | |
1758 | ||
1759 | /* Set the new iucv_sock */ | |
1760 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1761 | EBCASC(niucv->dst_name, 8); | |
1762 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1763 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1764 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1765 | niucv->path = path; | |
1766 | ||
1767 | /* Call iucv_accept */ | |
1768 | high_nmcpy(nuser_data, ipuser + 8); | |
1769 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1770 | ASCEBC(nuser_data + 8, 8); | |
1771 | ||
09488e2e HB |
1772 | /* set message limit for path based on msglimit of accepting socket */ |
1773 | niucv->msglimit = iucv->msglimit; | |
1774 | path->msglim = iucv->msglimit; | |
6fcd61f7 | 1775 | err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1776 | if (err) { |
6fcd61f7 | 1777 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 HB |
1778 | iucv_path_free(path); |
1779 | iucv_sock_kill(nsk); | |
eac3731b JH |
1780 | goto fail; |
1781 | } | |
1782 | ||
1783 | iucv_accept_enqueue(sk, nsk); | |
1784 | ||
1785 | /* Wake up accept */ | |
1786 | nsk->sk_state = IUCV_CONNECTED; | |
1787 | sk->sk_data_ready(sk, 1); | |
1788 | err = 0; | |
1789 | fail: | |
1790 | bh_unlock_sock(sk); | |
1791 | return 0; | |
1792 | } | |
1793 | ||
1794 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1795 | { | |
1796 | struct sock *sk = path->private; | |
1797 | ||
1798 | sk->sk_state = IUCV_CONNECTED; | |
1799 | sk->sk_state_change(sk); | |
1800 | } | |
1801 | ||
1802 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1803 | { | |
1804 | struct sock *sk = path->private; | |
561e0360 | 1805 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1806 | struct sk_buff *skb; |
1807 | struct sock_msg_q *save_msg; | |
1808 | int len; | |
561e0360 | 1809 | |
fe86e54e | 1810 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
6fcd61f7 | 1811 | pr_iucv->message_reject(path, msg); |
eac3731b | 1812 | return; |
fe86e54e | 1813 | } |
eac3731b | 1814 | |
3fa6b5ad | 1815 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1816 | |
f0703c80 UB |
1817 | if (!list_empty(&iucv->message_q.list) || |
1818 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1819 | goto save_message; | |
1820 | ||
1821 | len = atomic_read(&sk->sk_rmem_alloc); | |
b8942e3b | 1822 | len += iucv_msg_length(msg) + sizeof(struct sk_buff); |
f0703c80 UB |
1823 | if (len > sk->sk_rcvbuf) |
1824 | goto save_message; | |
1825 | ||
b8942e3b | 1826 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1827 | if (!skb) |
1828 | goto save_message; | |
eac3731b | 1829 | |
f0703c80 | 1830 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1831 | goto out_unlock; |
eac3731b | 1832 | |
f0703c80 UB |
1833 | save_message: |
1834 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1835 | if (!save_msg) |
a56635a5 | 1836 | goto out_unlock; |
f0703c80 UB |
1837 | save_msg->path = path; |
1838 | save_msg->msg = *msg; | |
eac3731b | 1839 | |
f0703c80 | 1840 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1841 | |
1842 | out_unlock: | |
f0703c80 | 1843 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1844 | } |
1845 | ||
1846 | static void iucv_callback_txdone(struct iucv_path *path, | |
1847 | struct iucv_message *msg) | |
1848 | { | |
1849 | struct sock *sk = path->private; | |
f2a77991 | 1850 | struct sk_buff *this = NULL; |
eac3731b JH |
1851 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1852 | struct sk_buff *list_skb = list->next; | |
1853 | unsigned long flags; | |
1854 | ||
f2a77991 | 1855 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1856 | spin_lock_irqsave(&list->lock, flags); |
1857 | ||
f2a77991 | 1858 | while (list_skb != (struct sk_buff *)list) { |
44b1e6b5 | 1859 | if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { |
f2a77991 UB |
1860 | this = list_skb; |
1861 | break; | |
1862 | } | |
561e0360 | 1863 | list_skb = list_skb->next; |
f2a77991 UB |
1864 | } |
1865 | if (this) | |
1866 | __skb_unlink(this, list); | |
561e0360 JH |
1867 | |
1868 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1869 | |
0ea920d2 HB |
1870 | if (this) { |
1871 | kfree_skb(this); | |
1872 | /* wake up any process waiting for sending */ | |
1873 | iucv_sock_wake_msglim(sk); | |
1874 | } | |
561e0360 | 1875 | } |
c2b4afd2 | 1876 | BUG_ON(!this); |
eac3731b | 1877 | |
da99f056 | 1878 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1879 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1880 | sk->sk_state = IUCV_CLOSED; | |
1881 | sk->sk_state_change(sk); | |
1882 | } | |
1883 | } | |
eac3731b | 1884 | |
eac3731b JH |
1885 | } |
1886 | ||
1887 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1888 | { | |
1889 | struct sock *sk = path->private; | |
1890 | ||
1891 | if (!list_empty(&iucv_sk(sk)->accept_q)) | |
1892 | sk->sk_state = IUCV_SEVERED; | |
1893 | else | |
1894 | sk->sk_state = IUCV_DISCONN; | |
1895 | ||
1896 | sk->sk_state_change(sk); | |
1897 | } | |
1898 | ||
af88b52d HB |
1899 | /* called if the other communication side shuts down its RECV direction; |
1900 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1901 | */ | |
1902 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1903 | { | |
1904 | struct sock *sk = path->private; | |
1905 | ||
1906 | bh_lock_sock(sk); | |
1907 | if (sk->sk_state != IUCV_CLOSED) { | |
1908 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1909 | sk->sk_state_change(sk); | |
1910 | } | |
1911 | bh_unlock_sock(sk); | |
1912 | } | |
1913 | ||
3881ac44 UB |
1914 | /***************** HiperSockets transport callbacks ********************/ |
1915 | static void afiucv_swap_src_dest(struct sk_buff *skb) | |
1916 | { | |
1917 | struct af_iucv_trans_hdr *trans_hdr = | |
1918 | (struct af_iucv_trans_hdr *)skb->data; | |
1919 | char tmpID[8]; | |
1920 | char tmpName[8]; | |
1921 | ||
1922 | ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
1923 | ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
1924 | ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
1925 | ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
1926 | memcpy(tmpID, trans_hdr->srcUserID, 8); | |
1927 | memcpy(tmpName, trans_hdr->srcAppName, 8); | |
1928 | memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); | |
1929 | memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); | |
1930 | memcpy(trans_hdr->destUserID, tmpID, 8); | |
1931 | memcpy(trans_hdr->destAppName, tmpName, 8); | |
1932 | skb_push(skb, ETH_HLEN); | |
1933 | memset(skb->data, 0, ETH_HLEN); | |
1934 | } | |
1935 | ||
1936 | /** | |
1937 | * afiucv_hs_callback_syn - react on received SYN | |
1938 | **/ | |
1939 | static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) | |
1940 | { | |
1941 | struct sock *nsk; | |
1942 | struct iucv_sock *iucv, *niucv; | |
1943 | struct af_iucv_trans_hdr *trans_hdr; | |
1944 | int err; | |
1945 | ||
1946 | iucv = iucv_sk(sk); | |
1947 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
1948 | if (!iucv) { | |
1949 | /* no sock - connection refused */ | |
1950 | afiucv_swap_src_dest(skb); | |
1951 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1952 | err = dev_queue_xmit(skb); | |
1953 | goto out; | |
1954 | } | |
1955 | ||
1956 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); | |
1957 | bh_lock_sock(sk); | |
1958 | if ((sk->sk_state != IUCV_LISTEN) || | |
1959 | sk_acceptq_is_full(sk) || | |
1960 | !nsk) { | |
1961 | /* error on server socket - connection refused */ | |
1962 | if (nsk) | |
1963 | sk_free(nsk); | |
1964 | afiucv_swap_src_dest(skb); | |
1965 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1966 | err = dev_queue_xmit(skb); | |
1967 | bh_unlock_sock(sk); | |
1968 | goto out; | |
1969 | } | |
1970 | ||
1971 | niucv = iucv_sk(nsk); | |
1972 | iucv_sock_init(nsk, sk); | |
1973 | niucv->transport = AF_IUCV_TRANS_HIPER; | |
1974 | niucv->msglimit = iucv->msglimit; | |
1975 | if (!trans_hdr->window) | |
1976 | niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; | |
1977 | else | |
1978 | niucv->msglimit_peer = trans_hdr->window; | |
1979 | memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); | |
1980 | memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); | |
1981 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1982 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1983 | nsk->sk_bound_dev_if = sk->sk_bound_dev_if; | |
1984 | afiucv_swap_src_dest(skb); | |
1985 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; | |
1986 | trans_hdr->window = niucv->msglimit; | |
1987 | /* if receiver acks the xmit connection is established */ | |
1988 | err = dev_queue_xmit(skb); | |
1989 | if (!err) { | |
1990 | iucv_accept_enqueue(sk, nsk); | |
1991 | nsk->sk_state = IUCV_CONNECTED; | |
1992 | sk->sk_data_ready(sk, 1); | |
1993 | } else | |
1994 | iucv_sock_kill(nsk); | |
1995 | bh_unlock_sock(sk); | |
1996 | ||
1997 | out: | |
1998 | return NET_RX_SUCCESS; | |
1999 | } | |
2000 | ||
2001 | /** | |
2002 | * afiucv_hs_callback_synack() - react on received SYN-ACK | |
2003 | **/ | |
2004 | static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) | |
2005 | { | |
2006 | struct iucv_sock *iucv = iucv_sk(sk); | |
2007 | struct af_iucv_trans_hdr *trans_hdr = | |
2008 | (struct af_iucv_trans_hdr *)skb->data; | |
2009 | ||
2010 | if (!iucv) | |
2011 | goto out; | |
2012 | if (sk->sk_state != IUCV_BOUND) | |
2013 | goto out; | |
2014 | bh_lock_sock(sk); | |
2015 | iucv->msglimit_peer = trans_hdr->window; | |
2016 | sk->sk_state = IUCV_CONNECTED; | |
2017 | sk->sk_state_change(sk); | |
2018 | bh_unlock_sock(sk); | |
2019 | out: | |
2020 | kfree_skb(skb); | |
2021 | return NET_RX_SUCCESS; | |
2022 | } | |
2023 | ||
2024 | /** | |
2025 | * afiucv_hs_callback_synfin() - react on received SYN_FIN | |
2026 | **/ | |
2027 | static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) | |
2028 | { | |
2029 | struct iucv_sock *iucv = iucv_sk(sk); | |
2030 | ||
2031 | if (!iucv) | |
2032 | goto out; | |
2033 | if (sk->sk_state != IUCV_BOUND) | |
2034 | goto out; | |
2035 | bh_lock_sock(sk); | |
2036 | sk->sk_state = IUCV_DISCONN; | |
2037 | sk->sk_state_change(sk); | |
2038 | bh_unlock_sock(sk); | |
2039 | out: | |
2040 | kfree_skb(skb); | |
2041 | return NET_RX_SUCCESS; | |
2042 | } | |
2043 | ||
2044 | /** | |
2045 | * afiucv_hs_callback_fin() - react on received FIN | |
2046 | **/ | |
2047 | static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) | |
2048 | { | |
2049 | struct iucv_sock *iucv = iucv_sk(sk); | |
2050 | ||
2051 | /* other end of connection closed */ | |
2052 | if (iucv) { | |
2053 | bh_lock_sock(sk); | |
2054 | if (!list_empty(&iucv->accept_q)) | |
2055 | sk->sk_state = IUCV_SEVERED; | |
2056 | else | |
2057 | sk->sk_state = IUCV_DISCONN; | |
2058 | sk->sk_state_change(sk); | |
2059 | bh_unlock_sock(sk); | |
2060 | } | |
2061 | kfree_skb(skb); | |
2062 | return NET_RX_SUCCESS; | |
2063 | } | |
2064 | ||
2065 | /** | |
2066 | * afiucv_hs_callback_win() - react on received WIN | |
2067 | **/ | |
2068 | static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) | |
2069 | { | |
2070 | struct iucv_sock *iucv = iucv_sk(sk); | |
2071 | struct af_iucv_trans_hdr *trans_hdr = | |
2072 | (struct af_iucv_trans_hdr *)skb->data; | |
2073 | ||
2074 | if (!iucv) | |
2075 | return NET_RX_SUCCESS; | |
2076 | ||
2077 | if (sk->sk_state != IUCV_CONNECTED) | |
2078 | return NET_RX_SUCCESS; | |
2079 | ||
2080 | atomic_sub(trans_hdr->window, &iucv->msg_sent); | |
2081 | iucv_sock_wake_msglim(sk); | |
2082 | return NET_RX_SUCCESS; | |
2083 | } | |
2084 | ||
2085 | /** | |
2086 | * afiucv_hs_callback_rx() - react on received data | |
2087 | **/ | |
2088 | static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) | |
2089 | { | |
2090 | struct iucv_sock *iucv = iucv_sk(sk); | |
2091 | ||
2092 | if (!iucv) { | |
2093 | kfree_skb(skb); | |
2094 | return NET_RX_SUCCESS; | |
2095 | } | |
2096 | ||
2097 | if (sk->sk_state != IUCV_CONNECTED) { | |
2098 | kfree_skb(skb); | |
2099 | return NET_RX_SUCCESS; | |
2100 | } | |
2101 | ||
2102 | /* write stuff from iucv_msg to skb cb */ | |
2103 | if (skb->len <= sizeof(struct af_iucv_trans_hdr)) { | |
2104 | kfree_skb(skb); | |
2105 | return NET_RX_SUCCESS; | |
2106 | } | |
2107 | skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); | |
2108 | skb_reset_transport_header(skb); | |
2109 | skb_reset_network_header(skb); | |
2110 | spin_lock(&iucv->message_q.lock); | |
2111 | if (skb_queue_empty(&iucv->backlog_skb_q)) { | |
2112 | if (sock_queue_rcv_skb(sk, skb)) { | |
2113 | /* handle rcv queue full */ | |
2114 | skb_queue_tail(&iucv->backlog_skb_q, skb); | |
2115 | } | |
2116 | } else | |
2117 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
2118 | spin_unlock(&iucv->message_q.lock); | |
2119 | return NET_RX_SUCCESS; | |
2120 | } | |
2121 | ||
2122 | /** | |
2123 | * afiucv_hs_rcv() - base function for arriving data through HiperSockets | |
2124 | * transport | |
2125 | * called from netif RX softirq | |
2126 | **/ | |
2127 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, | |
2128 | struct packet_type *pt, struct net_device *orig_dev) | |
2129 | { | |
2130 | struct hlist_node *node; | |
2131 | struct sock *sk; | |
2132 | struct iucv_sock *iucv; | |
2133 | struct af_iucv_trans_hdr *trans_hdr; | |
2134 | char nullstring[8]; | |
2135 | int err = 0; | |
2136 | ||
2137 | skb_pull(skb, ETH_HLEN); | |
2138 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
2139 | EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
2140 | EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
2141 | EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
2142 | EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
2143 | memset(nullstring, 0, sizeof(nullstring)); | |
2144 | iucv = NULL; | |
2145 | sk = NULL; | |
2146 | read_lock(&iucv_sk_list.lock); | |
2147 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
2148 | if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { | |
2149 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2150 | trans_hdr->destAppName, 8)) && | |
2151 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2152 | trans_hdr->destUserID, 8)) && | |
2153 | (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && | |
2154 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2155 | nullstring, 8))) { | |
2156 | iucv = iucv_sk(sk); | |
2157 | break; | |
2158 | } | |
2159 | } else { | |
2160 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2161 | trans_hdr->destAppName, 8)) && | |
2162 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2163 | trans_hdr->destUserID, 8)) && | |
2164 | (!memcmp(&iucv_sk(sk)->dst_name, | |
2165 | trans_hdr->srcAppName, 8)) && | |
2166 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2167 | trans_hdr->srcUserID, 8))) { | |
2168 | iucv = iucv_sk(sk); | |
2169 | break; | |
2170 | } | |
2171 | } | |
2172 | } | |
2173 | read_unlock(&iucv_sk_list.lock); | |
2174 | if (!iucv) | |
2175 | sk = NULL; | |
2176 | ||
2177 | /* no sock | |
2178 | how should we send with no sock | |
2179 | 1) send without sock no send rc checking? | |
2180 | 2) introduce default sock to handle this cases | |
2181 | ||
2182 | SYN -> send SYN|ACK in good case, send SYN|FIN in bad case | |
2183 | data -> send FIN | |
2184 | SYN|ACK, SYN|FIN, FIN -> no action? */ | |
2185 | ||
2186 | switch (trans_hdr->flags) { | |
2187 | case AF_IUCV_FLAG_SYN: | |
2188 | /* connect request */ | |
2189 | err = afiucv_hs_callback_syn(sk, skb); | |
2190 | break; | |
2191 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): | |
2192 | /* connect request confirmed */ | |
2193 | err = afiucv_hs_callback_synack(sk, skb); | |
2194 | break; | |
2195 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): | |
2196 | /* connect request refused */ | |
2197 | err = afiucv_hs_callback_synfin(sk, skb); | |
2198 | break; | |
2199 | case (AF_IUCV_FLAG_FIN): | |
2200 | /* close request */ | |
2201 | err = afiucv_hs_callback_fin(sk, skb); | |
2202 | break; | |
2203 | case (AF_IUCV_FLAG_WIN): | |
2204 | err = afiucv_hs_callback_win(sk, skb); | |
2205 | if (skb->len > sizeof(struct af_iucv_trans_hdr)) | |
2206 | err = afiucv_hs_callback_rx(sk, skb); | |
2207 | else | |
2208 | kfree(skb); | |
2209 | break; | |
2210 | case 0: | |
2211 | /* plain data frame */ | |
2212 | err = afiucv_hs_callback_rx(sk, skb); | |
2213 | break; | |
2214 | default: | |
2215 | ; | |
2216 | } | |
2217 | ||
2218 | return err; | |
2219 | } | |
2220 | ||
2221 | /** | |
2222 | * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets | |
2223 | * transport | |
2224 | **/ | |
2225 | static void afiucv_hs_callback_txnotify(struct sk_buff *skb, | |
2226 | enum iucv_tx_notify n) | |
2227 | { | |
2228 | struct sock *isk = skb->sk; | |
2229 | struct sock *sk = NULL; | |
2230 | struct iucv_sock *iucv = NULL; | |
2231 | struct sk_buff_head *list; | |
2232 | struct sk_buff *list_skb; | |
2233 | struct sk_buff *this = NULL; | |
2234 | unsigned long flags; | |
2235 | struct hlist_node *node; | |
2236 | ||
2237 | read_lock(&iucv_sk_list.lock); | |
2238 | sk_for_each(sk, node, &iucv_sk_list.head) | |
2239 | if (sk == isk) { | |
2240 | iucv = iucv_sk(sk); | |
2241 | break; | |
2242 | } | |
2243 | read_unlock(&iucv_sk_list.lock); | |
2244 | ||
2245 | if (!iucv) | |
2246 | return; | |
2247 | ||
2248 | bh_lock_sock(sk); | |
2249 | list = &iucv->send_skb_q; | |
2250 | list_skb = list->next; | |
2251 | if (skb_queue_empty(list)) | |
2252 | goto out_unlock; | |
2253 | ||
2254 | spin_lock_irqsave(&list->lock, flags); | |
2255 | while (list_skb != (struct sk_buff *)list) { | |
2256 | if (skb_shinfo(list_skb) == skb_shinfo(skb)) { | |
2257 | this = list_skb; | |
2258 | switch (n) { | |
2259 | case TX_NOTIFY_OK: | |
2260 | __skb_unlink(this, list); | |
2261 | iucv_sock_wake_msglim(sk); | |
2262 | kfree_skb(this); | |
2263 | break; | |
2264 | case TX_NOTIFY_PENDING: | |
2265 | atomic_inc(&iucv->pendings); | |
2266 | break; | |
2267 | case TX_NOTIFY_DELAYED_OK: | |
2268 | __skb_unlink(this, list); | |
2269 | atomic_dec(&iucv->pendings); | |
2270 | if (atomic_read(&iucv->pendings) <= 0) | |
2271 | iucv_sock_wake_msglim(sk); | |
2272 | kfree_skb(this); | |
2273 | break; | |
2274 | case TX_NOTIFY_UNREACHABLE: | |
2275 | case TX_NOTIFY_DELAYED_UNREACHABLE: | |
2276 | case TX_NOTIFY_TPQFULL: /* not yet used */ | |
2277 | case TX_NOTIFY_GENERALERROR: | |
2278 | case TX_NOTIFY_DELAYED_GENERALERROR: | |
2279 | __skb_unlink(this, list); | |
2280 | kfree_skb(this); | |
2281 | if (!list_empty(&iucv->accept_q)) | |
2282 | sk->sk_state = IUCV_SEVERED; | |
2283 | else | |
2284 | sk->sk_state = IUCV_DISCONN; | |
2285 | sk->sk_state_change(sk); | |
2286 | break; | |
2287 | } | |
2288 | break; | |
2289 | } | |
2290 | list_skb = list_skb->next; | |
2291 | } | |
2292 | spin_unlock_irqrestore(&list->lock, flags); | |
2293 | ||
2294 | out_unlock: | |
2295 | bh_unlock_sock(sk); | |
2296 | } | |
5708e868 | 2297 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
2298 | .family = PF_IUCV, |
2299 | .owner = THIS_MODULE, | |
2300 | .release = iucv_sock_release, | |
2301 | .bind = iucv_sock_bind, | |
2302 | .connect = iucv_sock_connect, | |
2303 | .listen = iucv_sock_listen, | |
2304 | .accept = iucv_sock_accept, | |
2305 | .getname = iucv_sock_getname, | |
2306 | .sendmsg = iucv_sock_sendmsg, | |
2307 | .recvmsg = iucv_sock_recvmsg, | |
2308 | .poll = iucv_sock_poll, | |
2309 | .ioctl = sock_no_ioctl, | |
2310 | .mmap = sock_no_mmap, | |
2311 | .socketpair = sock_no_socketpair, | |
2312 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
2313 | .setsockopt = iucv_sock_setsockopt, |
2314 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
2315 | }; |
2316 | ||
ec1b4cf7 | 2317 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
2318 | .family = AF_IUCV, |
2319 | .owner = THIS_MODULE, | |
2320 | .create = iucv_sock_create, | |
2321 | }; | |
2322 | ||
3881ac44 UB |
2323 | static struct packet_type iucv_packet_type = { |
2324 | .type = cpu_to_be16(ETH_P_AF_IUCV), | |
2325 | .func = afiucv_hs_rcv, | |
2326 | }; | |
2327 | ||
2328 | static int afiucv_iucv_init(void) | |
6fcd61f7 FB |
2329 | { |
2330 | int err; | |
2331 | ||
2332 | err = pr_iucv->iucv_register(&af_iucv_handler, 0); | |
2333 | if (err) | |
2334 | goto out; | |
2335 | /* establish dummy device */ | |
2336 | af_iucv_driver.bus = pr_iucv->bus; | |
2337 | err = driver_register(&af_iucv_driver); | |
2338 | if (err) | |
2339 | goto out_iucv; | |
2340 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
2341 | if (!af_iucv_dev) { | |
2342 | err = -ENOMEM; | |
2343 | goto out_driver; | |
2344 | } | |
2345 | dev_set_name(af_iucv_dev, "af_iucv"); | |
2346 | af_iucv_dev->bus = pr_iucv->bus; | |
2347 | af_iucv_dev->parent = pr_iucv->root; | |
2348 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
2349 | af_iucv_dev->driver = &af_iucv_driver; | |
2350 | err = device_register(af_iucv_dev); | |
2351 | if (err) | |
2352 | goto out_driver; | |
2353 | return 0; | |
2354 | ||
2355 | out_driver: | |
2356 | driver_unregister(&af_iucv_driver); | |
2357 | out_iucv: | |
2358 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2359 | out: | |
2360 | return err; | |
2361 | } | |
2362 | ||
da99f056 | 2363 | static int __init afiucv_init(void) |
eac3731b JH |
2364 | { |
2365 | int err; | |
2366 | ||
3881ac44 UB |
2367 | if (MACHINE_IS_VM) { |
2368 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
2369 | if (unlikely(err)) { | |
2370 | WARN_ON(err); | |
2371 | err = -EPROTONOSUPPORT; | |
2372 | goto out; | |
2373 | } | |
eac3731b | 2374 | |
3881ac44 UB |
2375 | pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); |
2376 | if (!pr_iucv) { | |
2377 | printk(KERN_WARNING "iucv_if lookup failed\n"); | |
2378 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2379 | } | |
2380 | } else { | |
2381 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2382 | pr_iucv = NULL; | |
6fcd61f7 FB |
2383 | } |
2384 | ||
eac3731b JH |
2385 | err = proto_register(&iucv_proto, 0); |
2386 | if (err) | |
6fcd61f7 | 2387 | goto out; |
eac3731b JH |
2388 | err = sock_register(&iucv_sock_family_ops); |
2389 | if (err) | |
2390 | goto out_proto; | |
6fcd61f7 | 2391 | |
3881ac44 UB |
2392 | if (pr_iucv) { |
2393 | err = afiucv_iucv_init(); | |
2394 | if (err) | |
2395 | goto out_sock; | |
2396 | } | |
2397 | dev_add_pack(&iucv_packet_type); | |
eac3731b JH |
2398 | return 0; |
2399 | ||
c23cad92 UB |
2400 | out_sock: |
2401 | sock_unregister(PF_IUCV); | |
eac3731b JH |
2402 | out_proto: |
2403 | proto_unregister(&iucv_proto); | |
eac3731b | 2404 | out: |
6fcd61f7 FB |
2405 | if (pr_iucv) |
2406 | symbol_put(iucv_if); | |
eac3731b JH |
2407 | return err; |
2408 | } | |
2409 | ||
2410 | static void __exit afiucv_exit(void) | |
2411 | { | |
3881ac44 UB |
2412 | if (pr_iucv) { |
2413 | device_unregister(af_iucv_dev); | |
2414 | driver_unregister(&af_iucv_driver); | |
2415 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2416 | symbol_put(iucv_if); | |
2417 | } | |
2418 | dev_remove_pack(&iucv_packet_type); | |
eac3731b JH |
2419 | sock_unregister(PF_IUCV); |
2420 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2421 | } |
2422 | ||
2423 | module_init(afiucv_init); | |
2424 | module_exit(afiucv_exit); | |
2425 | ||
2426 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
2427 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
2428 | MODULE_VERSION(VERSION); | |
2429 | MODULE_LICENSE("GPL"); | |
2430 | MODULE_ALIAS_NETPROTO(PF_IUCV); | |
3881ac44 | 2431 |