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Jennifer Hunteac37312007-02-08 13:51:54 -08001/*
Jennifer Hunteac37312007-02-08 13:51:54 -08002 * IUCV protocol stack for Linux on zSeries
3 *
Ursula Braunc23cad92009-06-16 10:30:44 +02004 * Copyright IBM Corp. 2006, 2009
Jennifer Hunteac37312007-02-08 13:51:54 -08005 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
Ursula Braunc23cad92009-06-16 10:30:44 +02007 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
Jennifer Hunteac37312007-02-08 13:51:54 -080010 */
11
Ursula Braun8f7c5022008-12-25 13:39:47 +010012#define KMSG_COMPONENT "af_iucv"
13#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
Jennifer Hunteac37312007-02-08 13:51:54 -080015#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
Jennifer Hunteac37312007-02-08 13:51:54 -080030#include <net/iucv/af_iucv.h>
31
Ursula Braun3881ac42011-08-08 01:33:54 +000032#define VERSION "1.2"
Jennifer Hunteac37312007-02-08 13:51:54 -080033
34static char iucv_userid[80];
35
Alexey Dobriyan5708e862009-09-14 12:23:23 +000036static const struct proto_ops iucv_sock_ops;
Jennifer Hunteac37312007-02-08 13:51:54 -080037
38static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42};
43
Frank Blaschka6fcd61f2011-08-08 01:33:51 +000044static struct iucv_interface *pr_iucv;
45
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +000046/* special AF_IUCV IPRM messages */
47static const u8 iprm_shutdown[8] =
48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
49
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +000050#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
51
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +000052#define __iucv_sock_wait(sk, condition, timeo, ret) \
53do { \
54 DEFINE_WAIT(__wait); \
55 long __timeo = timeo; \
56 ret = 0; \
Eric Dumazetaa395142010-04-20 13:03:51 +000057 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +000058 while (!(condition)) { \
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +000059 if (!__timeo) { \
60 ret = -EAGAIN; \
61 break; \
62 } \
63 if (signal_pending(current)) { \
64 ret = sock_intr_errno(__timeo); \
65 break; \
66 } \
67 release_sock(sk); \
68 __timeo = schedule_timeout(__timeo); \
69 lock_sock(sk); \
70 ret = sock_error(sk); \
71 if (ret) \
72 break; \
73 } \
Eric Dumazetaa395142010-04-20 13:03:51 +000074 finish_wait(sk_sleep(sk), &__wait); \
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +000075} while (0)
76
77#define iucv_sock_wait(sk, condition, timeo) \
78({ \
79 int __ret = 0; \
80 if (!(condition)) \
81 __iucv_sock_wait(sk, condition, timeo, __ret); \
82 __ret; \
83})
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +000084
Heiko Carstens57f20442007-10-08 02:02:52 -070085static void iucv_sock_kill(struct sock *sk);
86static void iucv_sock_close(struct sock *sk);
Ursula Braun7d316b92012-02-08 00:19:45 +000087static void iucv_sever_path(struct sock *, int);
Heiko Carstens57f20442007-10-08 02:02:52 -070088
Ursula Braun3881ac42011-08-08 01:33:54 +000089static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
90 struct packet_type *pt, struct net_device *orig_dev);
91static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
92 struct sk_buff *skb, u8 flags);
93static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
94
Jennifer Hunteac37312007-02-08 13:51:54 -080095/* Call Back functions */
96static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
97static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
Ursula Braun91e60eb2015-09-18 16:06:52 +020098static void iucv_callback_connack(struct iucv_path *, u8 *);
99static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
100static void iucv_callback_connrej(struct iucv_path *, u8 *);
101static void iucv_callback_shutdown(struct iucv_path *, u8 *);
Jennifer Hunteac37312007-02-08 13:51:54 -0800102
103static struct iucv_sock_list iucv_sk_list = {
Robert P. J. Day3db8ce32008-04-10 02:11:24 -0700104 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
Jennifer Hunteac37312007-02-08 13:51:54 -0800105 .autobind_name = ATOMIC_INIT(0)
106};
107
108static struct iucv_handler af_iucv_handler = {
109 .path_pending = iucv_callback_connreq,
110 .path_complete = iucv_callback_connack,
111 .path_severed = iucv_callback_connrej,
112 .message_pending = iucv_callback_rx,
Hendrik Brueckneraf88b522009-04-21 23:26:21 +0000113 .message_complete = iucv_callback_txdone,
114 .path_quiesced = iucv_callback_shutdown,
Jennifer Hunteac37312007-02-08 13:51:54 -0800115};
116
117static inline void high_nmcpy(unsigned char *dst, char *src)
118{
119 memcpy(dst, src, 8);
120}
121
122static inline void low_nmcpy(unsigned char *dst, char *src)
123{
124 memcpy(&dst[8], src, 8);
125}
126
Ursula Braunc23cad92009-06-16 10:30:44 +0200127static int afiucv_pm_prepare(struct device *dev)
128{
129#ifdef CONFIG_PM_DEBUG
130 printk(KERN_WARNING "afiucv_pm_prepare\n");
131#endif
132 return 0;
133}
134
135static void afiucv_pm_complete(struct device *dev)
136{
137#ifdef CONFIG_PM_DEBUG
138 printk(KERN_WARNING "afiucv_pm_complete\n");
139#endif
Ursula Braunc23cad92009-06-16 10:30:44 +0200140}
141
142/**
143 * afiucv_pm_freeze() - Freeze PM callback
144 * @dev: AFIUCV dummy device
145 *
146 * Sever all established IUCV communication pathes
147 */
148static int afiucv_pm_freeze(struct device *dev)
149{
150 struct iucv_sock *iucv;
151 struct sock *sk;
Ursula Braunc23cad92009-06-16 10:30:44 +0200152 int err = 0;
153
154#ifdef CONFIG_PM_DEBUG
155 printk(KERN_WARNING "afiucv_pm_freeze\n");
156#endif
157 read_lock(&iucv_sk_list.lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800158 sk_for_each(sk, &iucv_sk_list.head) {
Ursula Braunc23cad92009-06-16 10:30:44 +0200159 iucv = iucv_sk(sk);
Ursula Braunc23cad92009-06-16 10:30:44 +0200160 switch (sk->sk_state) {
Ursula Braunc23cad92009-06-16 10:30:44 +0200161 case IUCV_DISCONN:
162 case IUCV_CLOSING:
163 case IUCV_CONNECTED:
Ursula Braun7d316b92012-02-08 00:19:45 +0000164 iucv_sever_path(sk, 0);
Ursula Braunc23cad92009-06-16 10:30:44 +0200165 break;
166 case IUCV_OPEN:
167 case IUCV_BOUND:
168 case IUCV_LISTEN:
169 case IUCV_CLOSED:
170 default:
171 break;
172 }
Ursula Braun7d316b92012-02-08 00:19:45 +0000173 skb_queue_purge(&iucv->send_skb_q);
174 skb_queue_purge(&iucv->backlog_skb_q);
Ursula Braunc23cad92009-06-16 10:30:44 +0200175 }
176 read_unlock(&iucv_sk_list.lock);
177 return err;
178}
179
180/**
181 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
182 * @dev: AFIUCV dummy device
183 *
184 * socket clean up after freeze
185 */
186static int afiucv_pm_restore_thaw(struct device *dev)
187{
Ursula Braunc23cad92009-06-16 10:30:44 +0200188 struct sock *sk;
Ursula Braunc23cad92009-06-16 10:30:44 +0200189
190#ifdef CONFIG_PM_DEBUG
191 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
192#endif
193 read_lock(&iucv_sk_list.lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800194 sk_for_each(sk, &iucv_sk_list.head) {
Ursula Braunc23cad92009-06-16 10:30:44 +0200195 switch (sk->sk_state) {
196 case IUCV_CONNECTED:
197 sk->sk_err = EPIPE;
198 sk->sk_state = IUCV_DISCONN;
199 sk->sk_state_change(sk);
200 break;
201 case IUCV_DISCONN:
Ursula Braunc23cad92009-06-16 10:30:44 +0200202 case IUCV_CLOSING:
203 case IUCV_LISTEN:
204 case IUCV_BOUND:
205 case IUCV_OPEN:
206 default:
207 break;
208 }
209 }
210 read_unlock(&iucv_sk_list.lock);
211 return 0;
212}
213
Alexey Dobriyan47145212009-12-14 18:00:08 -0800214static const struct dev_pm_ops afiucv_pm_ops = {
Ursula Braunc23cad92009-06-16 10:30:44 +0200215 .prepare = afiucv_pm_prepare,
216 .complete = afiucv_pm_complete,
217 .freeze = afiucv_pm_freeze,
218 .thaw = afiucv_pm_restore_thaw,
219 .restore = afiucv_pm_restore_thaw,
220};
221
222static struct device_driver af_iucv_driver = {
223 .owner = THIS_MODULE,
224 .name = "afiucv",
Frank Blaschka6fcd61f2011-08-08 01:33:51 +0000225 .bus = NULL,
Ursula Braunc23cad92009-06-16 10:30:44 +0200226 .pm = &afiucv_pm_ops,
227};
228
229/* dummy device used as trigger for PM functions */
230static struct device *af_iucv_dev;
231
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +0000232/**
233 * iucv_msg_length() - Returns the length of an iucv message.
234 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
235 *
236 * The function returns the length of the specified iucv message @msg of data
237 * stored in a buffer and of data stored in the parameter list (PRMDATA).
238 *
239 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
240 * data:
241 * PRMDATA[0..6] socket data (max 7 bytes);
242 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
243 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300244 * The socket data length is computed by subtracting the socket data length
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +0000245 * value from 0xFF.
246 * If the socket data len is greater 7, then PRMDATA can be used for special
247 * notifications (see iucv_sock_shutdown); and further,
248 * if the socket data len is > 7, the function returns 8.
249 *
250 * Use this function to allocate socket buffers to store iucv message data.
251 */
252static inline size_t iucv_msg_length(struct iucv_message *msg)
253{
254 size_t datalen;
255
256 if (msg->flags & IUCV_IPRMDATA) {
257 datalen = 0xff - msg->rmmsg[7];
258 return (datalen < 8) ? datalen : 8;
259 }
260 return msg->length;
261}
262
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000263/**
264 * iucv_sock_in_state() - check for specific states
265 * @sk: sock structure
266 * @state: first iucv sk state
267 * @state: second iucv sk state
268 *
269 * Returns true if the socket in either in the first or second state.
270 */
271static int iucv_sock_in_state(struct sock *sk, int state, int state2)
272{
273 return (sk->sk_state == state || sk->sk_state == state2);
274}
275
276/**
277 * iucv_below_msglim() - function to check if messages can be sent
278 * @sk: sock structure
279 *
280 * Returns true if the send queue length is lower than the message limit.
281 * Always returns true if the socket is not connected (no iucv path for
282 * checking the message limit).
283 */
284static inline int iucv_below_msglim(struct sock *sk)
285{
286 struct iucv_sock *iucv = iucv_sk(sk);
287
288 if (sk->sk_state != IUCV_CONNECTED)
289 return 1;
Ursula Braun3881ac42011-08-08 01:33:54 +0000290 if (iucv->transport == AF_IUCV_TRANS_IUCV)
291 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
292 else
293 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
294 (atomic_read(&iucv->pendings) <= 0));
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000295}
296
297/**
298 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
299 */
300static void iucv_sock_wake_msglim(struct sock *sk)
301{
Eric Dumazet43815482010-04-29 11:01:49 +0000302 struct socket_wq *wq;
303
304 rcu_read_lock();
305 wq = rcu_dereference(sk->sk_wq);
Herbert Xu1ce0bf52015-11-26 13:55:39 +0800306 if (skwq_has_sleeper(wq))
Eric Dumazet43815482010-04-29 11:01:49 +0000307 wake_up_interruptible_all(&wq->wait);
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000308 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
Eric Dumazet43815482010-04-29 11:01:49 +0000309 rcu_read_unlock();
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000310}
311
Ursula Braun3881ac42011-08-08 01:33:54 +0000312/**
313 * afiucv_hs_send() - send a message through HiperSockets transport
314 */
315static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
316 struct sk_buff *skb, u8 flags)
317{
Ursula Braun3881ac42011-08-08 01:33:54 +0000318 struct iucv_sock *iucv = iucv_sk(sock);
319 struct af_iucv_trans_hdr *phs_hdr;
320 struct sk_buff *nskb;
321 int err, confirm_recv = 0;
322
323 memset(skb->head, 0, ETH_HLEN);
324 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
325 sizeof(struct af_iucv_trans_hdr));
326 skb_reset_mac_header(skb);
327 skb_reset_network_header(skb);
328 skb_push(skb, ETH_HLEN);
329 skb_reset_mac_header(skb);
330 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
331
332 phs_hdr->magic = ETH_P_AF_IUCV;
333 phs_hdr->version = 1;
334 phs_hdr->flags = flags;
335 if (flags == AF_IUCV_FLAG_SYN)
336 phs_hdr->window = iucv->msglimit;
337 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
338 confirm_recv = atomic_read(&iucv->msg_recv);
339 phs_hdr->window = confirm_recv;
340 if (confirm_recv)
341 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
342 }
343 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
344 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
345 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
346 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
347 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
348 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
349 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
350 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
351 if (imsg)
352 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
353
Ursula Braun800c5eb2012-02-08 00:19:47 +0000354 skb->dev = iucv->hs_dev;
Ursula Braun3881ac42011-08-08 01:33:54 +0000355 if (!skb->dev)
356 return -ENODEV;
Ursula Braun800c5eb2012-02-08 00:19:47 +0000357 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
Ursula Braun3881ac42011-08-08 01:33:54 +0000358 return -ENETDOWN;
359 if (skb->len > skb->dev->mtu) {
360 if (sock->sk_type == SOCK_SEQPACKET)
361 return -EMSGSIZE;
362 else
363 skb_trim(skb, skb->dev->mtu);
364 }
365 skb->protocol = ETH_P_AF_IUCV;
Ursula Braun3881ac42011-08-08 01:33:54 +0000366 nskb = skb_clone(skb, GFP_ATOMIC);
367 if (!nskb)
368 return -ENOMEM;
369 skb_queue_tail(&iucv->send_skb_q, nskb);
370 err = dev_queue_xmit(skb);
Ursula Braun800c5eb2012-02-08 00:19:47 +0000371 if (net_xmit_eval(err)) {
Ursula Braun3881ac42011-08-08 01:33:54 +0000372 skb_unlink(nskb, &iucv->send_skb_q);
373 kfree_skb(nskb);
374 } else {
375 atomic_sub(confirm_recv, &iucv->msg_recv);
376 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
377 }
Ursula Braun800c5eb2012-02-08 00:19:47 +0000378 return net_xmit_eval(err);
Ursula Braun3881ac42011-08-08 01:33:54 +0000379}
380
Jennifer Hunteac37312007-02-08 13:51:54 -0800381static struct sock *__iucv_get_sock_by_name(char *nm)
382{
383 struct sock *sk;
Jennifer Hunteac37312007-02-08 13:51:54 -0800384
Sasha Levinb67bfe02013-02-27 17:06:00 -0800385 sk_for_each(sk, &iucv_sk_list.head)
Jennifer Hunteac37312007-02-08 13:51:54 -0800386 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
387 return sk;
388
389 return NULL;
390}
391
392static void iucv_sock_destruct(struct sock *sk)
393{
394 skb_queue_purge(&sk->sk_receive_queue);
Ursula Braun82492a32012-03-07 02:06:24 +0000395 skb_queue_purge(&sk->sk_error_queue);
396
397 sk_mem_reclaim(sk);
398
399 if (!sock_flag(sk, SOCK_DEAD)) {
400 pr_err("Attempt to release alive iucv socket %p\n", sk);
401 return;
402 }
403
404 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
405 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
406 WARN_ON(sk->sk_wmem_queued);
407 WARN_ON(sk->sk_forward_alloc);
Jennifer Hunteac37312007-02-08 13:51:54 -0800408}
409
410/* Cleanup Listen */
411static void iucv_sock_cleanup_listen(struct sock *parent)
412{
413 struct sock *sk;
414
415 /* Close non-accepted connections */
416 while ((sk = iucv_accept_dequeue(parent, NULL))) {
417 iucv_sock_close(sk);
418 iucv_sock_kill(sk);
419 }
420
421 parent->sk_state = IUCV_CLOSED;
Jennifer Hunteac37312007-02-08 13:51:54 -0800422}
423
Hendrik Brueckner7514bab2009-09-16 04:37:27 +0000424/* Kill socket (only if zapped and orphaned) */
Jennifer Hunteac37312007-02-08 13:51:54 -0800425static void iucv_sock_kill(struct sock *sk)
426{
427 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
428 return;
429
430 iucv_sock_unlink(&iucv_sk_list, sk);
431 sock_set_flag(sk, SOCK_DEAD);
432 sock_put(sk);
433}
434
Ursula Braun7d316b92012-02-08 00:19:45 +0000435/* Terminate an IUCV path */
436static void iucv_sever_path(struct sock *sk, int with_user_data)
437{
438 unsigned char user_data[16];
439 struct iucv_sock *iucv = iucv_sk(sk);
440 struct iucv_path *path = iucv->path;
441
442 if (iucv->path) {
443 iucv->path = NULL;
444 if (with_user_data) {
445 low_nmcpy(user_data, iucv->src_name);
446 high_nmcpy(user_data, iucv->dst_name);
447 ASCEBC(user_data, sizeof(user_data));
448 pr_iucv->path_sever(path, user_data);
449 } else
450 pr_iucv->path_sever(path, NULL);
451 iucv_path_free(path);
452 }
453}
454
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000455/* Send FIN through an IUCV socket for HIPER transport */
456static int iucv_send_ctrl(struct sock *sk, u8 flags)
457{
458 int err = 0;
459 int blen;
460 struct sk_buff *skb;
461
462 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
463 skb = sock_alloc_send_skb(sk, blen, 1, &err);
464 if (skb) {
465 skb_reserve(skb, blen);
466 err = afiucv_hs_send(NULL, sk, skb, flags);
467 }
468 return err;
469}
470
Jennifer Hunteac37312007-02-08 13:51:54 -0800471/* Close an IUCV socket */
472static void iucv_sock_close(struct sock *sk)
473{
Jennifer Hunteac37312007-02-08 13:51:54 -0800474 struct iucv_sock *iucv = iucv_sk(sk);
Jennifer Hunt561e0362007-05-04 12:22:07 -0700475 unsigned long timeo;
Ursula Braun800c5eb2012-02-08 00:19:47 +0000476 int err = 0;
Jennifer Hunteac37312007-02-08 13:51:54 -0800477
Jennifer Hunteac37312007-02-08 13:51:54 -0800478 lock_sock(sk);
479
Heiko Carstensda99f052007-05-04 12:23:27 -0700480 switch (sk->sk_state) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800481 case IUCV_LISTEN:
482 iucv_sock_cleanup_listen(sk);
483 break;
484
485 case IUCV_CONNECTED:
Ursula Braun3881ac42011-08-08 01:33:54 +0000486 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000487 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
Ursula Braun3881ac42011-08-08 01:33:54 +0000488 sk->sk_state = IUCV_DISCONN;
489 sk->sk_state_change(sk);
490 }
Ursula Braun816abba2011-12-19 22:56:29 +0000491 case IUCV_DISCONN: /* fall through */
Jennifer Hunt561e0362007-05-04 12:22:07 -0700492 sk->sk_state = IUCV_CLOSING;
493 sk->sk_state_change(sk);
494
Ursula Braun800c5eb2012-02-08 00:19:47 +0000495 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
Jennifer Hunt561e0362007-05-04 12:22:07 -0700496 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
497 timeo = sk->sk_lingertime;
498 else
499 timeo = IUCV_DISCONN_TIMEOUT;
Ursula Braun9f6298a2011-05-12 18:45:08 +0000500 iucv_sock_wait(sk,
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000501 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
502 timeo);
Jennifer Hunt561e0362007-05-04 12:22:07 -0700503 }
504
Ursula Braunbbe188c2009-04-21 06:04:20 +0000505 case IUCV_CLOSING: /* fall through */
Jennifer Hunt561e0362007-05-04 12:22:07 -0700506 sk->sk_state = IUCV_CLOSED;
507 sk->sk_state_change(sk);
508
Jennifer Hunteac37312007-02-08 13:51:54 -0800509 sk->sk_err = ECONNRESET;
510 sk->sk_state_change(sk);
511
Ursula Braun800c5eb2012-02-08 00:19:47 +0000512 skb_queue_purge(&iucv->send_skb_q);
Jennifer Hunt561e0362007-05-04 12:22:07 -0700513 skb_queue_purge(&iucv->backlog_skb_q);
Jennifer Hunteac37312007-02-08 13:51:54 -0800514
Ursula Braun7d316b92012-02-08 00:19:45 +0000515 default: /* fall through */
516 iucv_sever_path(sk, 1);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700517 }
Jennifer Hunteac37312007-02-08 13:51:54 -0800518
Ursula Braun800c5eb2012-02-08 00:19:47 +0000519 if (iucv->hs_dev) {
520 dev_put(iucv->hs_dev);
521 iucv->hs_dev = NULL;
522 sk->sk_bound_dev_if = 0;
523 }
524
Hendrik Brueckner7514bab2009-09-16 04:37:27 +0000525 /* mark socket for deletion by iucv_sock_kill() */
526 sock_set_flag(sk, SOCK_ZAPPED);
527
Jennifer Hunteac37312007-02-08 13:51:54 -0800528 release_sock(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800529}
530
531static void iucv_sock_init(struct sock *sk, struct sock *parent)
532{
533 if (parent)
534 sk->sk_type = parent->sk_type;
535}
536
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500537static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
Jennifer Hunteac37312007-02-08 13:51:54 -0800538{
539 struct sock *sk;
Ursula Braun493d3972011-08-08 01:33:52 +0000540 struct iucv_sock *iucv;
Jennifer Hunteac37312007-02-08 13:51:54 -0800541
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500542 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
Jennifer Hunteac37312007-02-08 13:51:54 -0800543 if (!sk)
544 return NULL;
Ursula Braun493d3972011-08-08 01:33:52 +0000545 iucv = iucv_sk(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800546
547 sock_init_data(sock, sk);
Ursula Braun493d3972011-08-08 01:33:52 +0000548 INIT_LIST_HEAD(&iucv->accept_q);
549 spin_lock_init(&iucv->accept_q_lock);
550 skb_queue_head_init(&iucv->send_skb_q);
551 INIT_LIST_HEAD(&iucv->message_q.list);
552 spin_lock_init(&iucv->message_q.lock);
553 skb_queue_head_init(&iucv->backlog_skb_q);
554 iucv->send_tag = 0;
Ursula Braun3881ac42011-08-08 01:33:54 +0000555 atomic_set(&iucv->pendings, 0);
Ursula Braun493d3972011-08-08 01:33:52 +0000556 iucv->flags = 0;
Ursula Braun3881ac42011-08-08 01:33:54 +0000557 iucv->msglimit = 0;
558 atomic_set(&iucv->msg_sent, 0);
559 atomic_set(&iucv->msg_recv, 0);
Ursula Braun493d3972011-08-08 01:33:52 +0000560 iucv->path = NULL;
Ursula Braun3881ac42011-08-08 01:33:54 +0000561 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
Ursula Braun493d3972011-08-08 01:33:52 +0000562 memset(&iucv->src_user_id , 0, 32);
Ursula Braun3881ac42011-08-08 01:33:54 +0000563 if (pr_iucv)
564 iucv->transport = AF_IUCV_TRANS_IUCV;
565 else
566 iucv->transport = AF_IUCV_TRANS_HIPER;
Jennifer Hunteac37312007-02-08 13:51:54 -0800567
568 sk->sk_destruct = iucv_sock_destruct;
569 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
570 sk->sk_allocation = GFP_DMA;
571
572 sock_reset_flag(sk, SOCK_ZAPPED);
573
574 sk->sk_protocol = proto;
575 sk->sk_state = IUCV_OPEN;
576
Jennifer Hunteac37312007-02-08 13:51:54 -0800577 iucv_sock_link(&iucv_sk_list, sk);
578 return sk;
579}
580
581/* Create an IUCV socket */
Eric Paris3f378b62009-11-05 22:18:14 -0800582static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
583 int kern)
Jennifer Hunteac37312007-02-08 13:51:54 -0800584{
585 struct sock *sk;
586
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +0000587 if (protocol && protocol != PF_IUCV)
588 return -EPROTONOSUPPORT;
Jennifer Hunteac37312007-02-08 13:51:54 -0800589
590 sock->state = SS_UNCONNECTED;
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +0000591
592 switch (sock->type) {
593 case SOCK_STREAM:
594 sock->ops = &iucv_sock_ops;
595 break;
596 case SOCK_SEQPACKET:
597 /* currently, proto ops can handle both sk types */
598 sock->ops = &iucv_sock_ops;
599 break;
600 default:
601 return -ESOCKTNOSUPPORT;
602 }
Jennifer Hunteac37312007-02-08 13:51:54 -0800603
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500604 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
Jennifer Hunteac37312007-02-08 13:51:54 -0800605 if (!sk)
606 return -ENOMEM;
607
608 iucv_sock_init(sk, NULL);
609
610 return 0;
611}
612
613void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
614{
615 write_lock_bh(&l->lock);
616 sk_add_node(sk, &l->head);
617 write_unlock_bh(&l->lock);
618}
619
620void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
621{
622 write_lock_bh(&l->lock);
623 sk_del_node_init(sk);
624 write_unlock_bh(&l->lock);
625}
626
627void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
628{
Ursula Braunfebca282007-07-14 19:04:25 -0700629 unsigned long flags;
630 struct iucv_sock *par = iucv_sk(parent);
631
Jennifer Hunteac37312007-02-08 13:51:54 -0800632 sock_hold(sk);
Ursula Braunfebca282007-07-14 19:04:25 -0700633 spin_lock_irqsave(&par->accept_q_lock, flags);
634 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
635 spin_unlock_irqrestore(&par->accept_q_lock, flags);
Jennifer Hunteac37312007-02-08 13:51:54 -0800636 iucv_sk(sk)->parent = parent;
Hendrik Brueckner49f5eba2009-10-14 22:54:55 +0000637 sk_acceptq_added(parent);
Jennifer Hunteac37312007-02-08 13:51:54 -0800638}
639
640void iucv_accept_unlink(struct sock *sk)
641{
Ursula Braunfebca282007-07-14 19:04:25 -0700642 unsigned long flags;
643 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
644
645 spin_lock_irqsave(&par->accept_q_lock, flags);
Jennifer Hunteac37312007-02-08 13:51:54 -0800646 list_del_init(&iucv_sk(sk)->accept_q);
Ursula Braunfebca282007-07-14 19:04:25 -0700647 spin_unlock_irqrestore(&par->accept_q_lock, flags);
Hendrik Brueckner49f5eba2009-10-14 22:54:55 +0000648 sk_acceptq_removed(iucv_sk(sk)->parent);
Jennifer Hunteac37312007-02-08 13:51:54 -0800649 iucv_sk(sk)->parent = NULL;
650 sock_put(sk);
651}
652
653struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
654{
655 struct iucv_sock *isk, *n;
656 struct sock *sk;
657
Heiko Carstensda99f052007-05-04 12:23:27 -0700658 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800659 sk = (struct sock *) isk;
660 lock_sock(sk);
661
662 if (sk->sk_state == IUCV_CLOSED) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800663 iucv_accept_unlink(sk);
Ursula Braunfebca282007-07-14 19:04:25 -0700664 release_sock(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800665 continue;
666 }
667
668 if (sk->sk_state == IUCV_CONNECTED ||
Ursula Braunaac63992011-12-19 22:56:31 +0000669 sk->sk_state == IUCV_DISCONN ||
Jennifer Hunteac37312007-02-08 13:51:54 -0800670 !newsock) {
671 iucv_accept_unlink(sk);
672 if (newsock)
673 sock_graft(sk, newsock);
674
Jennifer Hunteac37312007-02-08 13:51:54 -0800675 release_sock(sk);
676 return sk;
677 }
678
679 release_sock(sk);
680 }
681 return NULL;
682}
683
Philipp Hachtmann53a4b492014-05-28 10:22:28 +0200684static void __iucv_auto_name(struct iucv_sock *iucv)
685{
686 char name[12];
687
688 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
689 while (__iucv_get_sock_by_name(name)) {
690 sprintf(name, "%08x",
691 atomic_inc_return(&iucv_sk_list.autobind_name));
692 }
693 memcpy(iucv->src_name, name, 8);
694}
695
Jennifer Hunteac37312007-02-08 13:51:54 -0800696/* Bind an unbound socket */
697static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
698 int addr_len)
699{
700 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
701 struct sock *sk = sock->sk;
702 struct iucv_sock *iucv;
Ursula Braun3881ac42011-08-08 01:33:54 +0000703 int err = 0;
704 struct net_device *dev;
705 char uid[9];
Jennifer Hunteac37312007-02-08 13:51:54 -0800706
707 /* Verify the input sockaddr */
708 if (!addr || addr->sa_family != AF_IUCV)
709 return -EINVAL;
710
711 lock_sock(sk);
712 if (sk->sk_state != IUCV_OPEN) {
713 err = -EBADFD;
714 goto done;
715 }
716
717 write_lock_bh(&iucv_sk_list.lock);
718
719 iucv = iucv_sk(sk);
720 if (__iucv_get_sock_by_name(sa->siucv_name)) {
721 err = -EADDRINUSE;
722 goto done_unlock;
723 }
Ursula Braun3881ac42011-08-08 01:33:54 +0000724 if (iucv->path)
Jennifer Hunteac37312007-02-08 13:51:54 -0800725 goto done_unlock;
Jennifer Hunteac37312007-02-08 13:51:54 -0800726
727 /* Bind the socket */
Ursula Braun3881ac42011-08-08 01:33:54 +0000728 if (pr_iucv)
729 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
730 goto vm_bind; /* VM IUCV transport */
Jennifer Hunteac37312007-02-08 13:51:54 -0800731
Ursula Braun3881ac42011-08-08 01:33:54 +0000732 /* try hiper transport */
733 memcpy(uid, sa->siucv_user_id, sizeof(uid));
734 ASCEBC(uid, 8);
735 rcu_read_lock();
736 for_each_netdev_rcu(&init_net, dev) {
737 if (!memcmp(dev->perm_addr, uid, 8)) {
Ursula Braun3881ac42011-08-08 01:33:54 +0000738 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
Philipp Hachtmann53a4b492014-05-28 10:22:28 +0200739 /* Check for unitialized siucv_name */
740 if (strncmp(sa->siucv_name, " ", 8) == 0)
741 __iucv_auto_name(iucv);
742 else
743 memcpy(iucv->src_name, sa->siucv_name, 8);
Ursula Braun816abba2011-12-19 22:56:29 +0000744 sk->sk_bound_dev_if = dev->ifindex;
Ursula Braun800c5eb2012-02-08 00:19:47 +0000745 iucv->hs_dev = dev;
746 dev_hold(dev);
Ursula Braun3881ac42011-08-08 01:33:54 +0000747 sk->sk_state = IUCV_BOUND;
748 iucv->transport = AF_IUCV_TRANS_HIPER;
749 if (!iucv->msglimit)
750 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
751 rcu_read_unlock();
752 goto done_unlock;
753 }
754 }
755 rcu_read_unlock();
756vm_bind:
757 if (pr_iucv) {
758 /* use local userid for backward compat */
759 memcpy(iucv->src_name, sa->siucv_name, 8);
760 memcpy(iucv->src_user_id, iucv_userid, 8);
761 sk->sk_state = IUCV_BOUND;
762 iucv->transport = AF_IUCV_TRANS_IUCV;
763 if (!iucv->msglimit)
764 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
765 goto done_unlock;
766 }
767 /* found no dev to bind */
768 err = -ENODEV;
Jennifer Hunteac37312007-02-08 13:51:54 -0800769done_unlock:
770 /* Release the socket list lock */
771 write_unlock_bh(&iucv_sk_list.lock);
772done:
773 release_sock(sk);
774 return err;
775}
776
777/* Automatically bind an unbound socket */
778static int iucv_sock_autobind(struct sock *sk)
779{
780 struct iucv_sock *iucv = iucv_sk(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800781 int err = 0;
782
Ursula Braunaac63992011-12-19 22:56:31 +0000783 if (unlikely(!pr_iucv))
Jennifer Hunteac37312007-02-08 13:51:54 -0800784 return -EPROTO;
785
Ursula Braunaac63992011-12-19 22:56:31 +0000786 memcpy(iucv->src_user_id, iucv_userid, 8);
Jennifer Hunteac37312007-02-08 13:51:54 -0800787
788 write_lock_bh(&iucv_sk_list.lock);
Philipp Hachtmann53a4b492014-05-28 10:22:28 +0200789 __iucv_auto_name(iucv);
Jennifer Hunteac37312007-02-08 13:51:54 -0800790 write_unlock_bh(&iucv_sk_list.lock);
791
Ursula Braun3881ac42011-08-08 01:33:54 +0000792 if (!iucv->msglimit)
793 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
794
Jennifer Hunteac37312007-02-08 13:51:54 -0800795 return err;
796}
797
Ursula Braun3881ac42011-08-08 01:33:54 +0000798static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
Jennifer Hunteac37312007-02-08 13:51:54 -0800799{
800 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
801 struct sock *sk = sock->sk;
Ursula Braun493d3972011-08-08 01:33:52 +0000802 struct iucv_sock *iucv = iucv_sk(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800803 unsigned char user_data[16];
804 int err;
805
Jennifer Hunteac37312007-02-08 13:51:54 -0800806 high_nmcpy(user_data, sa->siucv_name);
Ursula Braun493d3972011-08-08 01:33:52 +0000807 low_nmcpy(user_data, iucv->src_name);
Jennifer Hunteac37312007-02-08 13:51:54 -0800808 ASCEBC(user_data, sizeof(user_data));
809
Jennifer Hunteac37312007-02-08 13:51:54 -0800810 /* Create path. */
Hendrik Brueckner09488e22009-04-21 23:26:27 +0000811 iucv->path = iucv_path_alloc(iucv->msglimit,
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +0000812 IUCV_IPRMDATA, GFP_KERNEL);
Ursula Braund4444722008-02-07 18:07:19 -0800813 if (!iucv->path) {
814 err = -ENOMEM;
815 goto done;
816 }
Frank Blaschka6fcd61f2011-08-08 01:33:51 +0000817 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
818 sa->siucv_user_id, NULL, user_data,
819 sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800820 if (err) {
821 iucv_path_free(iucv->path);
822 iucv->path = NULL;
Hendrik Brueckner55cdea92009-01-05 18:07:07 -0800823 switch (err) {
824 case 0x0b: /* Target communicator is not logged on */
825 err = -ENETUNREACH;
826 break;
827 case 0x0d: /* Max connections for this guest exceeded */
828 case 0x0e: /* Max connections for target guest exceeded */
829 err = -EAGAIN;
830 break;
831 case 0x0f: /* Missing IUCV authorization */
832 err = -EACCES;
833 break;
834 default:
835 err = -ECONNREFUSED;
836 break;
837 }
Ursula Braun3881ac42011-08-08 01:33:54 +0000838 }
839done:
840 return err;
841}
842
843/* Connect an unconnected socket */
844static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
845 int alen, int flags)
846{
847 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
848 struct sock *sk = sock->sk;
849 struct iucv_sock *iucv = iucv_sk(sk);
850 int err;
851
852 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
853 return -EINVAL;
854
855 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
856 return -EBADFD;
857
858 if (sk->sk_state == IUCV_OPEN &&
859 iucv->transport == AF_IUCV_TRANS_HIPER)
860 return -EBADFD; /* explicit bind required */
861
862 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
863 return -EINVAL;
864
865 if (sk->sk_state == IUCV_OPEN) {
866 err = iucv_sock_autobind(sk);
867 if (unlikely(err))
868 return err;
Jennifer Hunteac37312007-02-08 13:51:54 -0800869 }
870
Ursula Braun3881ac42011-08-08 01:33:54 +0000871 lock_sock(sk);
872
873 /* Set the destination information */
874 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
875 memcpy(iucv->dst_name, sa->siucv_name, 8);
876
877 if (iucv->transport == AF_IUCV_TRANS_HIPER)
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000878 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
Ursula Braun3881ac42011-08-08 01:33:54 +0000879 else
880 err = afiucv_path_connect(sock, addr);
881 if (err)
882 goto done;
883
884 if (sk->sk_state != IUCV_CONNECTED)
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000885 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
886 IUCV_DISCONN),
887 sock_sndtimeo(sk, flags & O_NONBLOCK));
Jennifer Hunteac37312007-02-08 13:51:54 -0800888
Ursula Braun3881ac42011-08-08 01:33:54 +0000889 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +0000890 err = -ECONNREFUSED;
Ursula Braun18becbc2009-01-05 18:07:46 -0800891
Ursula Braun7d316b92012-02-08 00:19:45 +0000892 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
893 iucv_sever_path(sk, 0);
Ursula Braun18becbc2009-01-05 18:07:46 -0800894
Jennifer Hunteac37312007-02-08 13:51:54 -0800895done:
896 release_sock(sk);
897 return err;
898}
899
900/* Move a socket into listening state. */
901static int iucv_sock_listen(struct socket *sock, int backlog)
902{
903 struct sock *sk = sock->sk;
904 int err;
905
906 lock_sock(sk);
907
908 err = -EINVAL;
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +0000909 if (sk->sk_state != IUCV_BOUND)
910 goto done;
911
912 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
Jennifer Hunteac37312007-02-08 13:51:54 -0800913 goto done;
914
915 sk->sk_max_ack_backlog = backlog;
916 sk->sk_ack_backlog = 0;
917 sk->sk_state = IUCV_LISTEN;
918 err = 0;
919
920done:
921 release_sock(sk);
922 return err;
923}
924
925/* Accept a pending connection */
926static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
927 int flags)
928{
929 DECLARE_WAITQUEUE(wait, current);
930 struct sock *sk = sock->sk, *nsk;
931 long timeo;
932 int err = 0;
933
Jennifer Hunt561e0362007-05-04 12:22:07 -0700934 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
Jennifer Hunteac37312007-02-08 13:51:54 -0800935
936 if (sk->sk_state != IUCV_LISTEN) {
937 err = -EBADFD;
938 goto done;
939 }
940
941 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
942
943 /* Wait for an incoming connection */
Eric Dumazetaa395142010-04-20 13:03:51 +0000944 add_wait_queue_exclusive(sk_sleep(sk), &wait);
Heiko Carstensda99f052007-05-04 12:23:27 -0700945 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800946 set_current_state(TASK_INTERRUPTIBLE);
947 if (!timeo) {
948 err = -EAGAIN;
949 break;
950 }
951
952 release_sock(sk);
953 timeo = schedule_timeout(timeo);
Jennifer Hunt561e0362007-05-04 12:22:07 -0700954 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
Jennifer Hunteac37312007-02-08 13:51:54 -0800955
956 if (sk->sk_state != IUCV_LISTEN) {
957 err = -EBADFD;
958 break;
959 }
960
961 if (signal_pending(current)) {
962 err = sock_intr_errno(timeo);
963 break;
964 }
965 }
966
967 set_current_state(TASK_RUNNING);
Eric Dumazetaa395142010-04-20 13:03:51 +0000968 remove_wait_queue(sk_sleep(sk), &wait);
Jennifer Hunteac37312007-02-08 13:51:54 -0800969
970 if (err)
971 goto done;
972
973 newsock->state = SS_CONNECTED;
974
975done:
976 release_sock(sk);
977 return err;
978}
979
980static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
981 int *len, int peer)
982{
983 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
984 struct sock *sk = sock->sk;
Ursula Braun493d3972011-08-08 01:33:52 +0000985 struct iucv_sock *iucv = iucv_sk(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800986
987 addr->sa_family = AF_IUCV;
988 *len = sizeof(struct sockaddr_iucv);
989
990 if (peer) {
Ursula Braun493d3972011-08-08 01:33:52 +0000991 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
992 memcpy(siucv->siucv_name, iucv->dst_name, 8);
Jennifer Hunteac37312007-02-08 13:51:54 -0800993 } else {
Ursula Braun493d3972011-08-08 01:33:52 +0000994 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
995 memcpy(siucv->siucv_name, iucv->src_name, 8);
Jennifer Hunteac37312007-02-08 13:51:54 -0800996 }
997 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
998 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
Ursula Braun493d3972011-08-08 01:33:52 +0000999 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
Jennifer Hunteac37312007-02-08 13:51:54 -08001000
1001 return 0;
1002}
1003
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001004/**
1005 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1006 * @path: IUCV path
1007 * @msg: Pointer to a struct iucv_message
1008 * @skb: The socket data to send, skb->len MUST BE <= 7
1009 *
1010 * Send the socket data in the parameter list in the iucv message
1011 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1012 * list and the socket data len at index 7 (last byte).
1013 * See also iucv_msg_length().
1014 *
1015 * Returns the error code from the iucv_message_send() call.
1016 */
1017static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1018 struct sk_buff *skb)
1019{
1020 u8 prmdata[8];
1021
1022 memcpy(prmdata, (void *) skb->data, skb->len);
1023 prmdata[7] = 0xff - (u8) skb->len;
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001024 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001025 (void *) prmdata, 8);
1026}
1027
Ying Xue1b784142015-03-02 15:37:48 +08001028static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1029 size_t len)
Jennifer Hunteac37312007-02-08 13:51:54 -08001030{
1031 struct sock *sk = sock->sk;
1032 struct iucv_sock *iucv = iucv_sk(sk);
1033 struct sk_buff *skb;
1034 struct iucv_message txmsg;
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001035 struct cmsghdr *cmsg;
1036 int cmsg_done;
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001037 long timeo;
Ursula Braun8f7c5022008-12-25 13:39:47 +01001038 char user_id[9];
1039 char appl_id[9];
Jennifer Hunteac37312007-02-08 13:51:54 -08001040 int err;
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001041 int noblock = msg->msg_flags & MSG_DONTWAIT;
Jennifer Hunteac37312007-02-08 13:51:54 -08001042
1043 err = sock_error(sk);
1044 if (err)
1045 return err;
1046
1047 if (msg->msg_flags & MSG_OOB)
1048 return -EOPNOTSUPP;
1049
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001050 /* SOCK_SEQPACKET: we do not support segmented records */
1051 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1052 return -EOPNOTSUPP;
1053
Jennifer Hunteac37312007-02-08 13:51:54 -08001054 lock_sock(sk);
1055
1056 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1057 err = -EPIPE;
1058 goto out;
1059 }
1060
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001061 /* Return if the socket is not in connected state */
1062 if (sk->sk_state != IUCV_CONNECTED) {
1063 err = -ENOTCONN;
1064 goto out;
1065 }
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001066
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001067 /* initialize defaults */
1068 cmsg_done = 0; /* check for duplicate headers */
1069 txmsg.class = 0;
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001070
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001071 /* iterate over control messages */
Gu Zhengf95b4142014-12-11 11:22:04 +08001072 for_each_cmsghdr(cmsg, msg) {
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001073 if (!CMSG_OK(msg, cmsg)) {
1074 err = -EINVAL;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001075 goto out;
Jennifer Hunteac37312007-02-08 13:51:54 -08001076 }
1077
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001078 if (cmsg->cmsg_level != SOL_IUCV)
1079 continue;
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001080
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001081 if (cmsg->cmsg_type & cmsg_done) {
1082 err = -EINVAL;
1083 goto out;
1084 }
1085 cmsg_done |= cmsg->cmsg_type;
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001086
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001087 switch (cmsg->cmsg_type) {
1088 case SCM_IUCV_TRGCLS:
1089 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1090 err = -EINVAL;
1091 goto out;
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001092 }
1093
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001094 /* set iucv message target class */
1095 memcpy(&txmsg.class,
1096 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1097
1098 break;
1099
1100 default:
1101 err = -EINVAL;
1102 goto out;
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001103 }
1104 }
1105
1106 /* allocate one skb for each iucv message:
1107 * this is fine for SOCK_SEQPACKET (unless we want to support
1108 * segmented records using the MSG_EOR flag), but
1109 * for SOCK_STREAM we might want to improve it in future */
Ursula Braun3881ac42011-08-08 01:33:54 +00001110 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1111 skb = sock_alloc_send_skb(sk,
1112 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1113 noblock, &err);
1114 else
1115 skb = sock_alloc_send_skb(sk, len, noblock, &err);
Eugene Crossered4ac422015-03-30 15:40:42 +02001116 if (!skb)
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001117 goto out;
Ursula Braun3881ac42011-08-08 01:33:54 +00001118 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1119 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
Al Viro6ce8e9c2014-04-06 21:25:44 -04001120 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001121 err = -EFAULT;
1122 goto fail;
1123 }
1124
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001125 /* wait if outstanding messages for iucv path has reached */
1126 timeo = sock_sndtimeo(sk, noblock);
1127 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1128 if (err)
1129 goto fail;
1130
1131 /* return -ECONNRESET if the socket is no longer connected */
1132 if (sk->sk_state != IUCV_CONNECTED) {
1133 err = -ECONNRESET;
1134 goto fail;
1135 }
1136
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001137 /* increment and save iucv message tag for msg_completion cbk */
1138 txmsg.tag = iucv->send_tag++;
Ursula Braunf9c41a62013-04-07 22:19:26 +00001139 IUCV_SKB_CB(skb)->tag = txmsg.tag;
Ursula Braun800c5eb2012-02-08 00:19:47 +00001140
Ursula Braun3881ac42011-08-08 01:33:54 +00001141 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1142 atomic_inc(&iucv->msg_sent);
1143 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1144 if (err) {
1145 atomic_dec(&iucv->msg_sent);
1146 goto fail;
1147 }
1148 goto release;
1149 }
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001150 skb_queue_tail(&iucv->send_skb_q, skb);
1151
1152 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1153 && skb->len <= 7) {
1154 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1155
1156 /* on success: there is no message_complete callback
1157 * for an IPRMDATA msg; remove skb from send queue */
1158 if (err == 0) {
1159 skb_unlink(skb, &iucv->send_skb_q);
1160 kfree_skb(skb);
1161 }
1162
1163 /* this error should never happen since the
1164 * IUCV_IPRMDATA path flag is set... sever path */
1165 if (err == 0x15) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001166 pr_iucv->path_sever(iucv->path, NULL);
Jennifer Hunteac37312007-02-08 13:51:54 -08001167 skb_unlink(skb, &iucv->send_skb_q);
1168 err = -EPIPE;
1169 goto fail;
1170 }
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001171 } else
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001172 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001173 (void *) skb->data, skb->len);
1174 if (err) {
1175 if (err == 3) {
1176 user_id[8] = 0;
1177 memcpy(user_id, iucv->dst_user_id, 8);
1178 appl_id[8] = 0;
1179 memcpy(appl_id, iucv->dst_name, 8);
1180 pr_err("Application %s on z/VM guest %s"
1181 " exceeds message limit\n",
1182 appl_id, user_id);
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001183 err = -EAGAIN;
1184 } else
1185 err = -EPIPE;
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001186 skb_unlink(skb, &iucv->send_skb_q);
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001187 goto fail;
Jennifer Hunteac37312007-02-08 13:51:54 -08001188 }
1189
Ursula Braun3881ac42011-08-08 01:33:54 +00001190release:
Jennifer Hunteac37312007-02-08 13:51:54 -08001191 release_sock(sk);
1192 return len;
1193
1194fail:
1195 kfree_skb(skb);
1196out:
1197 release_sock(sk);
1198 return err;
1199}
1200
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001201/* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1202 *
1203 * Locking: must be called with message_q.lock held
1204 */
Ursula Braunf0703c82007-10-08 02:03:31 -07001205static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1206{
1207 int dataleft, size, copied = 0;
1208 struct sk_buff *nskb;
1209
1210 dataleft = len;
1211 while (dataleft) {
1212 if (dataleft >= sk->sk_rcvbuf / 4)
1213 size = sk->sk_rcvbuf / 4;
1214 else
1215 size = dataleft;
1216
1217 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1218 if (!nskb)
1219 return -ENOMEM;
1220
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001221 /* copy target class to control buffer of new skb */
Ursula Braunf9c41a62013-04-07 22:19:26 +00001222 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001223
1224 /* copy data fragment */
Ursula Braunf0703c82007-10-08 02:03:31 -07001225 memcpy(nskb->data, skb->data + copied, size);
1226 copied += size;
1227 dataleft -= size;
1228
1229 skb_reset_transport_header(nskb);
1230 skb_reset_network_header(nskb);
1231 nskb->len = size;
1232
1233 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1234 }
1235
1236 return 0;
1237}
1238
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001239/* iucv_process_message() - Receive a single outstanding IUCV message
1240 *
1241 * Locking: must be called with message_q.lock held
1242 */
Ursula Braunf0703c82007-10-08 02:03:31 -07001243static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1244 struct iucv_path *path,
1245 struct iucv_message *msg)
1246{
1247 int rc;
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001248 unsigned int len;
Ursula Braunf0703c82007-10-08 02:03:31 -07001249
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001250 len = iucv_msg_length(msg);
1251
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001252 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1253 /* Note: the first 4 bytes are reserved for msg tag */
Ursula Braunf9c41a62013-04-07 22:19:26 +00001254 IUCV_SKB_CB(skb)->class = msg->class;
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001255
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001256 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1257 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1258 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1259 skb->data = NULL;
1260 skb->len = 0;
1261 }
Ursula Braunf0703c82007-10-08 02:03:31 -07001262 } else {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001263 rc = pr_iucv->message_receive(path, msg,
1264 msg->flags & IUCV_IPRMDATA,
1265 skb->data, len, NULL);
Ursula Braunf0703c82007-10-08 02:03:31 -07001266 if (rc) {
1267 kfree_skb(skb);
1268 return;
1269 }
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001270 /* we need to fragment iucv messages for SOCK_STREAM only;
1271 * for SOCK_SEQPACKET, it is only relevant if we support
1272 * record segmentation using MSG_EOR (see also recvmsg()) */
1273 if (sk->sk_type == SOCK_STREAM &&
1274 skb->truesize >= sk->sk_rcvbuf / 4) {
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001275 rc = iucv_fragment_skb(sk, skb, len);
Ursula Braunf0703c82007-10-08 02:03:31 -07001276 kfree_skb(skb);
1277 skb = NULL;
1278 if (rc) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001279 pr_iucv->path_sever(path, NULL);
Ursula Braunf0703c82007-10-08 02:03:31 -07001280 return;
1281 }
1282 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1283 } else {
1284 skb_reset_transport_header(skb);
1285 skb_reset_network_header(skb);
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001286 skb->len = len;
Ursula Braunf0703c82007-10-08 02:03:31 -07001287 }
1288 }
1289
Ursula Braunf9c41a62013-04-07 22:19:26 +00001290 IUCV_SKB_CB(skb)->offset = 0;
Ursula Braunf0703c82007-10-08 02:03:31 -07001291 if (sock_queue_rcv_skb(sk, skb))
1292 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1293}
1294
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001295/* iucv_process_message_q() - Process outstanding IUCV messages
1296 *
1297 * Locking: must be called with message_q.lock held
1298 */
Ursula Braunf0703c82007-10-08 02:03:31 -07001299static void iucv_process_message_q(struct sock *sk)
1300{
1301 struct iucv_sock *iucv = iucv_sk(sk);
1302 struct sk_buff *skb;
1303 struct sock_msg_q *p, *n;
1304
1305 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001306 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
Ursula Braunf0703c82007-10-08 02:03:31 -07001307 if (!skb)
1308 break;
1309 iucv_process_message(sk, skb, p->path, &p->msg);
1310 list_del(&p->list);
1311 kfree(p);
1312 if (!skb_queue_empty(&iucv->backlog_skb_q))
1313 break;
1314 }
1315}
1316
Ying Xue1b784142015-03-02 15:37:48 +08001317static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1318 size_t len, int flags)
Jennifer Hunteac37312007-02-08 13:51:54 -08001319{
1320 int noblock = flags & MSG_DONTWAIT;
1321 struct sock *sk = sock->sk;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001322 struct iucv_sock *iucv = iucv_sk(sk);
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001323 unsigned int copied, rlen;
Ursula Braun9fbd87d2012-03-07 02:06:23 +00001324 struct sk_buff *skb, *rskb, *cskb;
Jennifer Hunteac37312007-02-08 13:51:54 -08001325 int err = 0;
Ursula Braunf9c41a62013-04-07 22:19:26 +00001326 u32 offset;
Jennifer Hunteac37312007-02-08 13:51:54 -08001327
Ursula Braunaac63992011-12-19 22:56:31 +00001328 if ((sk->sk_state == IUCV_DISCONN) &&
Ursula Braunf0703c82007-10-08 02:03:31 -07001329 skb_queue_empty(&iucv->backlog_skb_q) &&
1330 skb_queue_empty(&sk->sk_receive_queue) &&
1331 list_empty(&iucv->message_q.list))
Jennifer Hunt561e0362007-05-04 12:22:07 -07001332 return 0;
1333
Jennifer Hunteac37312007-02-08 13:51:54 -08001334 if (flags & (MSG_OOB))
1335 return -EOPNOTSUPP;
1336
Hendrik Brueckner60d37052009-04-21 06:04:21 +00001337 /* receive/dequeue next skb:
1338 * the function understands MSG_PEEK and, thus, does not dequeue skb */
Jennifer Hunteac37312007-02-08 13:51:54 -08001339 skb = skb_recv_datagram(sk, flags, noblock, &err);
1340 if (!skb) {
1341 if (sk->sk_shutdown & RCV_SHUTDOWN)
1342 return 0;
1343 return err;
1344 }
1345
Ursula Braunf9c41a62013-04-07 22:19:26 +00001346 offset = IUCV_SKB_CB(skb)->offset;
1347 rlen = skb->len - offset; /* real length of skb */
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001348 copied = min_t(unsigned int, rlen, len);
Ursula Braun82492a32012-03-07 02:06:24 +00001349 if (!rlen)
1350 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
Jennifer Hunteac37312007-02-08 13:51:54 -08001351
Jennifer Hunt561e0362007-05-04 12:22:07 -07001352 cskb = skb;
David S. Miller51f3d022014-11-05 16:46:40 -05001353 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
Hendrik Brueckner802788b2009-04-21 23:26:26 +00001354 if (!(flags & MSG_PEEK))
1355 skb_queue_head(&sk->sk_receive_queue, skb);
1356 return -EFAULT;
Jennifer Hunteac37312007-02-08 13:51:54 -08001357 }
1358
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001359 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1360 if (sk->sk_type == SOCK_SEQPACKET) {
1361 if (copied < rlen)
1362 msg->msg_flags |= MSG_TRUNC;
1363 /* each iucv message contains a complete record */
1364 msg->msg_flags |= MSG_EOR;
1365 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001366
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001367 /* create control message to store iucv msg target class:
1368 * get the trgcls from the control buffer of the skb due to
1369 * fragmentation of original iucv message. */
1370 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
Ursula Braunf9c41a62013-04-07 22:19:26 +00001371 sizeof(IUCV_SKB_CB(skb)->class),
1372 (void *)&IUCV_SKB_CB(skb)->class);
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001373 if (err) {
1374 if (!(flags & MSG_PEEK))
1375 skb_queue_head(&sk->sk_receive_queue, skb);
1376 return err;
1377 }
1378
Jennifer Hunteac37312007-02-08 13:51:54 -08001379 /* Mark read part of skb as used */
1380 if (!(flags & MSG_PEEK)) {
Jennifer Hunteac37312007-02-08 13:51:54 -08001381
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001382 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1383 if (sk->sk_type == SOCK_STREAM) {
Ursula Braunf9c41a62013-04-07 22:19:26 +00001384 if (copied < rlen) {
1385 IUCV_SKB_CB(skb)->offset = offset + copied;
Ursula Braun2f139a52014-03-19 07:57:59 +01001386 skb_queue_head(&sk->sk_receive_queue, skb);
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001387 goto done;
1388 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001389 }
1390
1391 kfree_skb(skb);
Ursula Braun800c5eb2012-02-08 00:19:47 +00001392 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1393 atomic_inc(&iucv->msg_recv);
1394 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1395 WARN_ON(1);
1396 iucv_sock_close(sk);
1397 return -EFAULT;
1398 }
1399 }
Jennifer Hunt561e0362007-05-04 12:22:07 -07001400
1401 /* Queue backlog skbs */
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001402 spin_lock_bh(&iucv->message_q.lock);
Ursula Braunf0703c82007-10-08 02:03:31 -07001403 rskb = skb_dequeue(&iucv->backlog_skb_q);
Heiko Carstensda99f052007-05-04 12:23:27 -07001404 while (rskb) {
Ursula Braunf9c41a62013-04-07 22:19:26 +00001405 IUCV_SKB_CB(rskb)->offset = 0;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001406 if (sock_queue_rcv_skb(sk, rskb)) {
Ursula Braunf0703c82007-10-08 02:03:31 -07001407 skb_queue_head(&iucv->backlog_skb_q,
Jennifer Hunt561e0362007-05-04 12:22:07 -07001408 rskb);
1409 break;
1410 } else {
Ursula Braunf0703c82007-10-08 02:03:31 -07001411 rskb = skb_dequeue(&iucv->backlog_skb_q);
Jennifer Hunt561e0362007-05-04 12:22:07 -07001412 }
1413 }
Ursula Braunf0703c82007-10-08 02:03:31 -07001414 if (skb_queue_empty(&iucv->backlog_skb_q)) {
Ursula Braunf0703c82007-10-08 02:03:31 -07001415 if (!list_empty(&iucv->message_q.list))
1416 iucv_process_message_q(sk);
Ursula Braun3881ac42011-08-08 01:33:54 +00001417 if (atomic_read(&iucv->msg_recv) >=
1418 iucv->msglimit / 2) {
Ursula Braun9fbd87d2012-03-07 02:06:23 +00001419 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
Ursula Braun3881ac42011-08-08 01:33:54 +00001420 if (err) {
1421 sk->sk_state = IUCV_DISCONN;
1422 sk->sk_state_change(sk);
1423 }
1424 }
Ursula Braunf0703c82007-10-08 02:03:31 -07001425 }
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001426 spin_unlock_bh(&iucv->message_q.lock);
Hendrik Brueckner60d37052009-04-21 06:04:21 +00001427 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001428
1429done:
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001430 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1431 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1432 copied = rlen;
1433
1434 return copied;
Jennifer Hunteac37312007-02-08 13:51:54 -08001435}
1436
1437static inline unsigned int iucv_accept_poll(struct sock *parent)
1438{
1439 struct iucv_sock *isk, *n;
1440 struct sock *sk;
1441
Heiko Carstensda99f052007-05-04 12:23:27 -07001442 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
Jennifer Hunteac37312007-02-08 13:51:54 -08001443 sk = (struct sock *) isk;
1444
1445 if (sk->sk_state == IUCV_CONNECTED)
1446 return POLLIN | POLLRDNORM;
1447 }
1448
1449 return 0;
1450}
1451
1452unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1453 poll_table *wait)
1454{
1455 struct sock *sk = sock->sk;
1456 unsigned int mask = 0;
1457
Eric Dumazetaa395142010-04-20 13:03:51 +00001458 sock_poll_wait(file, sk_sleep(sk), wait);
Jennifer Hunteac37312007-02-08 13:51:54 -08001459
1460 if (sk->sk_state == IUCV_LISTEN)
1461 return iucv_accept_poll(sk);
1462
1463 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
Keller, Jacob E7d4c04f2013-03-28 11:19:25 +00001464 mask |= POLLERR |
Jacob Keller8facd5f2013-04-02 13:55:40 -07001465 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
Jennifer Hunteac37312007-02-08 13:51:54 -08001466
1467 if (sk->sk_shutdown & RCV_SHUTDOWN)
1468 mask |= POLLRDHUP;
1469
1470 if (sk->sk_shutdown == SHUTDOWN_MASK)
1471 mask |= POLLHUP;
1472
1473 if (!skb_queue_empty(&sk->sk_receive_queue) ||
Heiko Carstensda99f052007-05-04 12:23:27 -07001474 (sk->sk_shutdown & RCV_SHUTDOWN))
Jennifer Hunteac37312007-02-08 13:51:54 -08001475 mask |= POLLIN | POLLRDNORM;
1476
1477 if (sk->sk_state == IUCV_CLOSED)
1478 mask |= POLLHUP;
1479
Ursula Braunaac63992011-12-19 22:56:31 +00001480 if (sk->sk_state == IUCV_DISCONN)
Jennifer Hunt561e0362007-05-04 12:22:07 -07001481 mask |= POLLIN;
1482
Ursula Braun7f1b0ea2012-02-08 00:19:46 +00001483 if (sock_writeable(sk) && iucv_below_msglim(sk))
Jennifer Hunteac37312007-02-08 13:51:54 -08001484 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1485 else
1486 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1487
1488 return mask;
1489}
1490
1491static int iucv_sock_shutdown(struct socket *sock, int how)
1492{
1493 struct sock *sk = sock->sk;
1494 struct iucv_sock *iucv = iucv_sk(sk);
1495 struct iucv_message txmsg;
1496 int err = 0;
Jennifer Hunteac37312007-02-08 13:51:54 -08001497
1498 how++;
1499
1500 if ((how & ~SHUTDOWN_MASK) || !how)
1501 return -EINVAL;
1502
1503 lock_sock(sk);
Heiko Carstensda99f052007-05-04 12:23:27 -07001504 switch (sk->sk_state) {
Ursula Braun82492a32012-03-07 02:06:24 +00001505 case IUCV_LISTEN:
Hendrik Bruecknere14ad5f2009-04-21 06:04:23 +00001506 case IUCV_DISCONN:
1507 case IUCV_CLOSING:
Jennifer Hunteac37312007-02-08 13:51:54 -08001508 case IUCV_CLOSED:
1509 err = -ENOTCONN;
1510 goto fail;
Jennifer Hunteac37312007-02-08 13:51:54 -08001511 default:
Jennifer Hunteac37312007-02-08 13:51:54 -08001512 break;
1513 }
1514
1515 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
Ursula Braun82492a32012-03-07 02:06:24 +00001516 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1517 txmsg.class = 0;
1518 txmsg.tag = 0;
1519 err = pr_iucv->message_send(iucv->path, &txmsg,
1520 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1521 if (err) {
1522 switch (err) {
1523 case 1:
1524 err = -ENOTCONN;
1525 break;
1526 case 2:
1527 err = -ECONNRESET;
1528 break;
1529 default:
1530 err = -ENOTCONN;
1531 break;
1532 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001533 }
Ursula Braun82492a32012-03-07 02:06:24 +00001534 } else
1535 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
Jennifer Hunteac37312007-02-08 13:51:54 -08001536 }
1537
Ursula Braun82492a32012-03-07 02:06:24 +00001538 sk->sk_shutdown |= how;
Jennifer Hunteac37312007-02-08 13:51:54 -08001539 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
Ursula Braun1042cab2014-07-21 12:54:44 +02001540 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1541 iucv->path) {
Ursula Braun82492a32012-03-07 02:06:24 +00001542 err = pr_iucv->path_quiesce(iucv->path, NULL);
1543 if (err)
1544 err = -ENOTCONN;
1545/* skb_queue_purge(&sk->sk_receive_queue); */
1546 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001547 skb_queue_purge(&sk->sk_receive_queue);
1548 }
1549
1550 /* Wake up anyone sleeping in poll */
1551 sk->sk_state_change(sk);
1552
1553fail:
1554 release_sock(sk);
1555 return err;
1556}
1557
1558static int iucv_sock_release(struct socket *sock)
1559{
1560 struct sock *sk = sock->sk;
1561 int err = 0;
1562
1563 if (!sk)
1564 return 0;
1565
1566 iucv_sock_close(sk);
1567
Jennifer Hunteac37312007-02-08 13:51:54 -08001568 sock_orphan(sk);
1569 iucv_sock_kill(sk);
1570 return err;
1571}
1572
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001573/* getsockopt and setsockopt */
1574static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001575 char __user *optval, unsigned int optlen)
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001576{
1577 struct sock *sk = sock->sk;
1578 struct iucv_sock *iucv = iucv_sk(sk);
1579 int val;
1580 int rc;
1581
1582 if (level != SOL_IUCV)
1583 return -ENOPROTOOPT;
1584
1585 if (optlen < sizeof(int))
1586 return -EINVAL;
1587
1588 if (get_user(val, (int __user *) optval))
1589 return -EFAULT;
1590
1591 rc = 0;
1592
1593 lock_sock(sk);
1594 switch (optname) {
1595 case SO_IPRMDATA_MSG:
1596 if (val)
1597 iucv->flags |= IUCV_IPRMDATA;
1598 else
1599 iucv->flags &= ~IUCV_IPRMDATA;
1600 break;
Hendrik Brueckner09488e22009-04-21 23:26:27 +00001601 case SO_MSGLIMIT:
1602 switch (sk->sk_state) {
1603 case IUCV_OPEN:
1604 case IUCV_BOUND:
1605 if (val < 1 || val > (u16)(~0))
1606 rc = -EINVAL;
1607 else
1608 iucv->msglimit = val;
1609 break;
1610 default:
1611 rc = -EINVAL;
1612 break;
1613 }
1614 break;
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001615 default:
1616 rc = -ENOPROTOOPT;
1617 break;
1618 }
1619 release_sock(sk);
1620
1621 return rc;
1622}
1623
1624static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1625 char __user *optval, int __user *optlen)
1626{
1627 struct sock *sk = sock->sk;
1628 struct iucv_sock *iucv = iucv_sk(sk);
Ursula Braun51363b82012-02-08 00:19:48 +00001629 unsigned int val;
1630 int len;
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001631
1632 if (level != SOL_IUCV)
1633 return -ENOPROTOOPT;
1634
1635 if (get_user(len, optlen))
1636 return -EFAULT;
1637
1638 if (len < 0)
1639 return -EINVAL;
1640
1641 len = min_t(unsigned int, len, sizeof(int));
1642
1643 switch (optname) {
1644 case SO_IPRMDATA_MSG:
1645 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1646 break;
Hendrik Brueckner09488e22009-04-21 23:26:27 +00001647 case SO_MSGLIMIT:
1648 lock_sock(sk);
1649 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1650 : iucv->msglimit; /* default */
1651 release_sock(sk);
1652 break;
Ursula Braun51363b82012-02-08 00:19:48 +00001653 case SO_MSGSIZE:
1654 if (sk->sk_state == IUCV_OPEN)
1655 return -EBADFD;
1656 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1657 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1658 0x7fffffff;
1659 break;
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001660 default:
1661 return -ENOPROTOOPT;
1662 }
1663
1664 if (put_user(len, optlen))
1665 return -EFAULT;
1666 if (copy_to_user(optval, &val, len))
1667 return -EFAULT;
1668
1669 return 0;
1670}
1671
1672
Jennifer Hunteac37312007-02-08 13:51:54 -08001673/* Callback wrappers - called from iucv base support */
1674static int iucv_callback_connreq(struct iucv_path *path,
1675 u8 ipvmid[8], u8 ipuser[16])
1676{
1677 unsigned char user_data[16];
1678 unsigned char nuser_data[16];
1679 unsigned char src_name[8];
Jennifer Hunteac37312007-02-08 13:51:54 -08001680 struct sock *sk, *nsk;
1681 struct iucv_sock *iucv, *niucv;
1682 int err;
1683
1684 memcpy(src_name, ipuser, 8);
1685 EBCASC(src_name, 8);
1686 /* Find out if this path belongs to af_iucv. */
1687 read_lock(&iucv_sk_list.lock);
1688 iucv = NULL;
Ursula Braunfebca282007-07-14 19:04:25 -07001689 sk = NULL;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001690 sk_for_each(sk, &iucv_sk_list.head)
Jennifer Hunteac37312007-02-08 13:51:54 -08001691 if (sk->sk_state == IUCV_LISTEN &&
1692 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1693 /*
1694 * Found a listening socket with
1695 * src_name == ipuser[0-7].
1696 */
1697 iucv = iucv_sk(sk);
1698 break;
1699 }
1700 read_unlock(&iucv_sk_list.lock);
1701 if (!iucv)
1702 /* No socket found, not one of our paths. */
1703 return -EINVAL;
1704
1705 bh_lock_sock(sk);
1706
1707 /* Check if parent socket is listening */
1708 low_nmcpy(user_data, iucv->src_name);
1709 high_nmcpy(user_data, iucv->dst_name);
1710 ASCEBC(user_data, sizeof(user_data));
1711 if (sk->sk_state != IUCV_LISTEN) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001712 err = pr_iucv->path_sever(path, user_data);
Hendrik Brueckner65dbd7c2009-01-05 18:08:23 -08001713 iucv_path_free(path);
Jennifer Hunteac37312007-02-08 13:51:54 -08001714 goto fail;
1715 }
1716
1717 /* Check for backlog size */
1718 if (sk_acceptq_is_full(sk)) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001719 err = pr_iucv->path_sever(path, user_data);
Hendrik Brueckner65dbd7c2009-01-05 18:08:23 -08001720 iucv_path_free(path);
Jennifer Hunteac37312007-02-08 13:51:54 -08001721 goto fail;
1722 }
1723
1724 /* Create the new socket */
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001725 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
Heiko Carstensda99f052007-05-04 12:23:27 -07001726 if (!nsk) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001727 err = pr_iucv->path_sever(path, user_data);
Hendrik Brueckner65dbd7c2009-01-05 18:08:23 -08001728 iucv_path_free(path);
Jennifer Hunteac37312007-02-08 13:51:54 -08001729 goto fail;
1730 }
1731
1732 niucv = iucv_sk(nsk);
1733 iucv_sock_init(nsk, sk);
1734
1735 /* Set the new iucv_sock */
1736 memcpy(niucv->dst_name, ipuser + 8, 8);
1737 EBCASC(niucv->dst_name, 8);
1738 memcpy(niucv->dst_user_id, ipvmid, 8);
1739 memcpy(niucv->src_name, iucv->src_name, 8);
1740 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1741 niucv->path = path;
1742
1743 /* Call iucv_accept */
1744 high_nmcpy(nuser_data, ipuser + 8);
1745 memcpy(nuser_data + 8, niucv->src_name, 8);
1746 ASCEBC(nuser_data + 8, 8);
1747
Hendrik Brueckner09488e22009-04-21 23:26:27 +00001748 /* set message limit for path based on msglimit of accepting socket */
1749 niucv->msglimit = iucv->msglimit;
1750 path->msglim = iucv->msglimit;
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001751 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
Heiko Carstensda99f052007-05-04 12:23:27 -07001752 if (err) {
Ursula Braun7d316b92012-02-08 00:19:45 +00001753 iucv_sever_path(nsk, 1);
Hendrik Brueckner65dbd7c2009-01-05 18:08:23 -08001754 iucv_sock_kill(nsk);
Jennifer Hunteac37312007-02-08 13:51:54 -08001755 goto fail;
1756 }
1757
1758 iucv_accept_enqueue(sk, nsk);
1759
1760 /* Wake up accept */
1761 nsk->sk_state = IUCV_CONNECTED;
David S. Miller676d2362014-04-11 16:15:36 -04001762 sk->sk_data_ready(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -08001763 err = 0;
1764fail:
1765 bh_unlock_sock(sk);
1766 return 0;
1767}
1768
1769static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1770{
1771 struct sock *sk = path->private;
1772
1773 sk->sk_state = IUCV_CONNECTED;
1774 sk->sk_state_change(sk);
1775}
1776
1777static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1778{
1779 struct sock *sk = path->private;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001780 struct iucv_sock *iucv = iucv_sk(sk);
Ursula Braunf0703c82007-10-08 02:03:31 -07001781 struct sk_buff *skb;
1782 struct sock_msg_q *save_msg;
1783 int len;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001784
Hendrik Bruecknerfe86e542009-04-21 06:04:22 +00001785 if (sk->sk_shutdown & RCV_SHUTDOWN) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001786 pr_iucv->message_reject(path, msg);
Jennifer Hunteac37312007-02-08 13:51:54 -08001787 return;
Hendrik Bruecknerfe86e542009-04-21 06:04:22 +00001788 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001789
Hendrik Brueckner3fa6b5a2009-04-21 06:04:24 +00001790 spin_lock(&iucv->message_q.lock);
Jennifer Hunteac37312007-02-08 13:51:54 -08001791
Ursula Braunf0703c82007-10-08 02:03:31 -07001792 if (!list_empty(&iucv->message_q.list) ||
1793 !skb_queue_empty(&iucv->backlog_skb_q))
1794 goto save_message;
1795
1796 len = atomic_read(&sk->sk_rmem_alloc);
Eric Dumazet87fb4b72011-10-13 07:28:54 +00001797 len += SKB_TRUESIZE(iucv_msg_length(msg));
Ursula Braunf0703c82007-10-08 02:03:31 -07001798 if (len > sk->sk_rcvbuf)
1799 goto save_message;
1800
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001801 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
Ursula Braunf0703c82007-10-08 02:03:31 -07001802 if (!skb)
1803 goto save_message;
Jennifer Hunteac37312007-02-08 13:51:54 -08001804
Ursula Braunf0703c82007-10-08 02:03:31 -07001805 iucv_process_message(sk, skb, path, msg);
Hendrik Brueckner3fa6b5a2009-04-21 06:04:24 +00001806 goto out_unlock;
Jennifer Hunteac37312007-02-08 13:51:54 -08001807
Ursula Braunf0703c82007-10-08 02:03:31 -07001808save_message:
1809 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
Ursula Braund4444722008-02-07 18:07:19 -08001810 if (!save_msg)
Julia Lawalla56635a2010-05-26 05:56:48 +00001811 goto out_unlock;
Ursula Braunf0703c82007-10-08 02:03:31 -07001812 save_msg->path = path;
1813 save_msg->msg = *msg;
1814
Ursula Braunf0703c82007-10-08 02:03:31 -07001815 list_add_tail(&save_msg->list, &iucv->message_q.list);
Hendrik Brueckner3fa6b5a2009-04-21 06:04:24 +00001816
1817out_unlock:
Ursula Braunf0703c82007-10-08 02:03:31 -07001818 spin_unlock(&iucv->message_q.lock);
Jennifer Hunteac37312007-02-08 13:51:54 -08001819}
1820
1821static void iucv_callback_txdone(struct iucv_path *path,
1822 struct iucv_message *msg)
1823{
1824 struct sock *sk = path->private;
Ursula Braunf2a77992008-02-07 18:07:44 -08001825 struct sk_buff *this = NULL;
Jennifer Hunteac37312007-02-08 13:51:54 -08001826 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1827 struct sk_buff *list_skb = list->next;
1828 unsigned long flags;
1829
Ursula Braun7d316b92012-02-08 00:19:45 +00001830 bh_lock_sock(sk);
Ursula Braunf2a77992008-02-07 18:07:44 -08001831 if (!skb_queue_empty(list)) {
Jennifer Hunt561e0362007-05-04 12:22:07 -07001832 spin_lock_irqsave(&list->lock, flags);
Jennifer Hunteac37312007-02-08 13:51:54 -08001833
Ursula Braunf2a77992008-02-07 18:07:44 -08001834 while (list_skb != (struct sk_buff *)list) {
Ursula Braunf5738e22014-05-13 14:38:02 +02001835 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
Ursula Braunf2a77992008-02-07 18:07:44 -08001836 this = list_skb;
1837 break;
1838 }
Jennifer Hunt561e0362007-05-04 12:22:07 -07001839 list_skb = list_skb->next;
Ursula Braunf2a77992008-02-07 18:07:44 -08001840 }
1841 if (this)
1842 __skb_unlink(this, list);
Jennifer Hunteac37312007-02-08 13:51:54 -08001843
Jennifer Hunt561e0362007-05-04 12:22:07 -07001844 spin_unlock_irqrestore(&list->lock, flags);
Jennifer Hunteac37312007-02-08 13:51:54 -08001845
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001846 if (this) {
1847 kfree_skb(this);
1848 /* wake up any process waiting for sending */
1849 iucv_sock_wake_msglim(sk);
1850 }
Jennifer Hunt561e0362007-05-04 12:22:07 -07001851 }
1852
Heiko Carstensda99f052007-05-04 12:23:27 -07001853 if (sk->sk_state == IUCV_CLOSING) {
Jennifer Hunt561e0362007-05-04 12:22:07 -07001854 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1855 sk->sk_state = IUCV_CLOSED;
1856 sk->sk_state_change(sk);
1857 }
1858 }
Ursula Braun7d316b92012-02-08 00:19:45 +00001859 bh_unlock_sock(sk);
Jennifer Hunt561e0362007-05-04 12:22:07 -07001860
Jennifer Hunteac37312007-02-08 13:51:54 -08001861}
1862
1863static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1864{
1865 struct sock *sk = path->private;
1866
Ursula Braun7d316b92012-02-08 00:19:45 +00001867 if (sk->sk_state == IUCV_CLOSED)
1868 return;
1869
1870 bh_lock_sock(sk);
1871 iucv_sever_path(sk, 1);
Ursula Braunaac63992011-12-19 22:56:31 +00001872 sk->sk_state = IUCV_DISCONN;
Jennifer Hunteac37312007-02-08 13:51:54 -08001873
1874 sk->sk_state_change(sk);
Ursula Braun7d316b92012-02-08 00:19:45 +00001875 bh_unlock_sock(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -08001876}
1877
Hendrik Brueckneraf88b522009-04-21 23:26:21 +00001878/* called if the other communication side shuts down its RECV direction;
1879 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1880 */
1881static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1882{
1883 struct sock *sk = path->private;
1884
1885 bh_lock_sock(sk);
1886 if (sk->sk_state != IUCV_CLOSED) {
1887 sk->sk_shutdown |= SEND_SHUTDOWN;
1888 sk->sk_state_change(sk);
1889 }
1890 bh_unlock_sock(sk);
1891}
1892
Ursula Braun3881ac42011-08-08 01:33:54 +00001893/***************** HiperSockets transport callbacks ********************/
1894static void afiucv_swap_src_dest(struct sk_buff *skb)
1895{
1896 struct af_iucv_trans_hdr *trans_hdr =
1897 (struct af_iucv_trans_hdr *)skb->data;
1898 char tmpID[8];
1899 char tmpName[8];
1900
1901 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1902 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1903 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1904 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1905 memcpy(tmpID, trans_hdr->srcUserID, 8);
1906 memcpy(tmpName, trans_hdr->srcAppName, 8);
1907 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1908 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1909 memcpy(trans_hdr->destUserID, tmpID, 8);
1910 memcpy(trans_hdr->destAppName, tmpName, 8);
1911 skb_push(skb, ETH_HLEN);
1912 memset(skb->data, 0, ETH_HLEN);
1913}
1914
1915/**
1916 * afiucv_hs_callback_syn - react on received SYN
1917 **/
1918static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1919{
1920 struct sock *nsk;
1921 struct iucv_sock *iucv, *niucv;
1922 struct af_iucv_trans_hdr *trans_hdr;
1923 int err;
1924
1925 iucv = iucv_sk(sk);
1926 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1927 if (!iucv) {
1928 /* no sock - connection refused */
1929 afiucv_swap_src_dest(skb);
1930 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1931 err = dev_queue_xmit(skb);
1932 goto out;
1933 }
1934
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001935 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
Ursula Braun3881ac42011-08-08 01:33:54 +00001936 bh_lock_sock(sk);
1937 if ((sk->sk_state != IUCV_LISTEN) ||
1938 sk_acceptq_is_full(sk) ||
1939 !nsk) {
1940 /* error on server socket - connection refused */
Ursula Braun3881ac42011-08-08 01:33:54 +00001941 afiucv_swap_src_dest(skb);
1942 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1943 err = dev_queue_xmit(skb);
Ursula Braun4d520f62014-05-28 10:22:29 +02001944 iucv_sock_kill(nsk);
Ursula Braun3881ac42011-08-08 01:33:54 +00001945 bh_unlock_sock(sk);
1946 goto out;
1947 }
1948
1949 niucv = iucv_sk(nsk);
1950 iucv_sock_init(nsk, sk);
1951 niucv->transport = AF_IUCV_TRANS_HIPER;
1952 niucv->msglimit = iucv->msglimit;
1953 if (!trans_hdr->window)
1954 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1955 else
1956 niucv->msglimit_peer = trans_hdr->window;
1957 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1958 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1959 memcpy(niucv->src_name, iucv->src_name, 8);
1960 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1961 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
Ursula Braun800c5eb2012-02-08 00:19:47 +00001962 niucv->hs_dev = iucv->hs_dev;
1963 dev_hold(niucv->hs_dev);
Ursula Braun3881ac42011-08-08 01:33:54 +00001964 afiucv_swap_src_dest(skb);
1965 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1966 trans_hdr->window = niucv->msglimit;
1967 /* if receiver acks the xmit connection is established */
1968 err = dev_queue_xmit(skb);
1969 if (!err) {
1970 iucv_accept_enqueue(sk, nsk);
1971 nsk->sk_state = IUCV_CONNECTED;
David S. Miller676d2362014-04-11 16:15:36 -04001972 sk->sk_data_ready(sk);
Ursula Braun3881ac42011-08-08 01:33:54 +00001973 } else
1974 iucv_sock_kill(nsk);
1975 bh_unlock_sock(sk);
1976
1977out:
1978 return NET_RX_SUCCESS;
1979}
1980
1981/**
1982 * afiucv_hs_callback_synack() - react on received SYN-ACK
1983 **/
1984static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1985{
1986 struct iucv_sock *iucv = iucv_sk(sk);
1987 struct af_iucv_trans_hdr *trans_hdr =
1988 (struct af_iucv_trans_hdr *)skb->data;
1989
1990 if (!iucv)
1991 goto out;
1992 if (sk->sk_state != IUCV_BOUND)
1993 goto out;
1994 bh_lock_sock(sk);
1995 iucv->msglimit_peer = trans_hdr->window;
1996 sk->sk_state = IUCV_CONNECTED;
1997 sk->sk_state_change(sk);
1998 bh_unlock_sock(sk);
1999out:
2000 kfree_skb(skb);
2001 return NET_RX_SUCCESS;
2002}
2003
2004/**
2005 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2006 **/
2007static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2008{
2009 struct iucv_sock *iucv = iucv_sk(sk);
2010
2011 if (!iucv)
2012 goto out;
2013 if (sk->sk_state != IUCV_BOUND)
2014 goto out;
2015 bh_lock_sock(sk);
2016 sk->sk_state = IUCV_DISCONN;
2017 sk->sk_state_change(sk);
2018 bh_unlock_sock(sk);
2019out:
2020 kfree_skb(skb);
2021 return NET_RX_SUCCESS;
2022}
2023
2024/**
2025 * afiucv_hs_callback_fin() - react on received FIN
2026 **/
2027static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2028{
2029 struct iucv_sock *iucv = iucv_sk(sk);
2030
2031 /* other end of connection closed */
Ursula Braun800c5eb2012-02-08 00:19:47 +00002032 if (!iucv)
2033 goto out;
2034 bh_lock_sock(sk);
2035 if (sk->sk_state == IUCV_CONNECTED) {
Ursula Braunaac63992011-12-19 22:56:31 +00002036 sk->sk_state = IUCV_DISCONN;
Ursula Braun3881ac42011-08-08 01:33:54 +00002037 sk->sk_state_change(sk);
Ursula Braun3881ac42011-08-08 01:33:54 +00002038 }
Ursula Braun800c5eb2012-02-08 00:19:47 +00002039 bh_unlock_sock(sk);
2040out:
Ursula Braun3881ac42011-08-08 01:33:54 +00002041 kfree_skb(skb);
2042 return NET_RX_SUCCESS;
2043}
2044
2045/**
2046 * afiucv_hs_callback_win() - react on received WIN
2047 **/
2048static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2049{
2050 struct iucv_sock *iucv = iucv_sk(sk);
2051 struct af_iucv_trans_hdr *trans_hdr =
2052 (struct af_iucv_trans_hdr *)skb->data;
2053
2054 if (!iucv)
2055 return NET_RX_SUCCESS;
2056
2057 if (sk->sk_state != IUCV_CONNECTED)
2058 return NET_RX_SUCCESS;
2059
2060 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2061 iucv_sock_wake_msglim(sk);
2062 return NET_RX_SUCCESS;
2063}
2064
2065/**
2066 * afiucv_hs_callback_rx() - react on received data
2067 **/
2068static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2069{
2070 struct iucv_sock *iucv = iucv_sk(sk);
2071
2072 if (!iucv) {
2073 kfree_skb(skb);
2074 return NET_RX_SUCCESS;
2075 }
2076
2077 if (sk->sk_state != IUCV_CONNECTED) {
2078 kfree_skb(skb);
2079 return NET_RX_SUCCESS;
2080 }
2081
Ursula Braun82492a32012-03-07 02:06:24 +00002082 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2083 kfree_skb(skb);
2084 return NET_RX_SUCCESS;
2085 }
2086
Ursula Braun3881ac42011-08-08 01:33:54 +00002087 /* write stuff from iucv_msg to skb cb */
Ursula Braun82492a32012-03-07 02:06:24 +00002088 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
Ursula Braun3881ac42011-08-08 01:33:54 +00002089 kfree_skb(skb);
2090 return NET_RX_SUCCESS;
2091 }
2092 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2093 skb_reset_transport_header(skb);
2094 skb_reset_network_header(skb);
Ursula Braunf9c41a62013-04-07 22:19:26 +00002095 IUCV_SKB_CB(skb)->offset = 0;
Ursula Braun3881ac42011-08-08 01:33:54 +00002096 spin_lock(&iucv->message_q.lock);
2097 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2098 if (sock_queue_rcv_skb(sk, skb)) {
2099 /* handle rcv queue full */
2100 skb_queue_tail(&iucv->backlog_skb_q, skb);
2101 }
2102 } else
2103 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2104 spin_unlock(&iucv->message_q.lock);
2105 return NET_RX_SUCCESS;
2106}
2107
2108/**
2109 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2110 * transport
2111 * called from netif RX softirq
2112 **/
2113static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2114 struct packet_type *pt, struct net_device *orig_dev)
2115{
Ursula Braun3881ac42011-08-08 01:33:54 +00002116 struct sock *sk;
2117 struct iucv_sock *iucv;
2118 struct af_iucv_trans_hdr *trans_hdr;
2119 char nullstring[8];
2120 int err = 0;
2121
2122 skb_pull(skb, ETH_HLEN);
2123 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2124 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2125 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2126 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2127 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2128 memset(nullstring, 0, sizeof(nullstring));
2129 iucv = NULL;
2130 sk = NULL;
2131 read_lock(&iucv_sk_list.lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08002132 sk_for_each(sk, &iucv_sk_list.head) {
Ursula Braun3881ac42011-08-08 01:33:54 +00002133 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2134 if ((!memcmp(&iucv_sk(sk)->src_name,
2135 trans_hdr->destAppName, 8)) &&
2136 (!memcmp(&iucv_sk(sk)->src_user_id,
2137 trans_hdr->destUserID, 8)) &&
2138 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2139 (!memcmp(&iucv_sk(sk)->dst_user_id,
2140 nullstring, 8))) {
2141 iucv = iucv_sk(sk);
2142 break;
2143 }
2144 } else {
2145 if ((!memcmp(&iucv_sk(sk)->src_name,
2146 trans_hdr->destAppName, 8)) &&
2147 (!memcmp(&iucv_sk(sk)->src_user_id,
2148 trans_hdr->destUserID, 8)) &&
2149 (!memcmp(&iucv_sk(sk)->dst_name,
2150 trans_hdr->srcAppName, 8)) &&
2151 (!memcmp(&iucv_sk(sk)->dst_user_id,
2152 trans_hdr->srcUserID, 8))) {
2153 iucv = iucv_sk(sk);
2154 break;
2155 }
2156 }
2157 }
2158 read_unlock(&iucv_sk_list.lock);
2159 if (!iucv)
2160 sk = NULL;
2161
2162 /* no sock
2163 how should we send with no sock
2164 1) send without sock no send rc checking?
2165 2) introduce default sock to handle this cases
2166
2167 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2168 data -> send FIN
2169 SYN|ACK, SYN|FIN, FIN -> no action? */
2170
2171 switch (trans_hdr->flags) {
2172 case AF_IUCV_FLAG_SYN:
2173 /* connect request */
2174 err = afiucv_hs_callback_syn(sk, skb);
2175 break;
2176 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2177 /* connect request confirmed */
2178 err = afiucv_hs_callback_synack(sk, skb);
2179 break;
2180 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2181 /* connect request refused */
2182 err = afiucv_hs_callback_synfin(sk, skb);
2183 break;
2184 case (AF_IUCV_FLAG_FIN):
2185 /* close request */
2186 err = afiucv_hs_callback_fin(sk, skb);
2187 break;
2188 case (AF_IUCV_FLAG_WIN):
2189 err = afiucv_hs_callback_win(sk, skb);
Ursula Braun800c5eb2012-02-08 00:19:47 +00002190 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2191 kfree_skb(skb);
2192 break;
2193 }
Ursula Braun82492a32012-03-07 02:06:24 +00002194 /* fall through and receive non-zero length data */
2195 case (AF_IUCV_FLAG_SHT):
2196 /* shutdown request */
2197 /* fall through and receive zero length data */
Ursula Braun3881ac42011-08-08 01:33:54 +00002198 case 0:
2199 /* plain data frame */
Ursula Braunf9c41a62013-04-07 22:19:26 +00002200 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
Ursula Braun3881ac42011-08-08 01:33:54 +00002201 err = afiucv_hs_callback_rx(sk, skb);
2202 break;
2203 default:
2204 ;
2205 }
2206
2207 return err;
2208}
2209
2210/**
2211 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2212 * transport
2213 **/
2214static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2215 enum iucv_tx_notify n)
2216{
2217 struct sock *isk = skb->sk;
2218 struct sock *sk = NULL;
2219 struct iucv_sock *iucv = NULL;
2220 struct sk_buff_head *list;
2221 struct sk_buff *list_skb;
Ursula Braun800c5eb2012-02-08 00:19:47 +00002222 struct sk_buff *nskb;
Ursula Braun3881ac42011-08-08 01:33:54 +00002223 unsigned long flags;
Ursula Braun3881ac42011-08-08 01:33:54 +00002224
Ursula Braun800c5eb2012-02-08 00:19:47 +00002225 read_lock_irqsave(&iucv_sk_list.lock, flags);
Sasha Levinb67bfe02013-02-27 17:06:00 -08002226 sk_for_each(sk, &iucv_sk_list.head)
Ursula Braun3881ac42011-08-08 01:33:54 +00002227 if (sk == isk) {
2228 iucv = iucv_sk(sk);
2229 break;
2230 }
Ursula Braun800c5eb2012-02-08 00:19:47 +00002231 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
Ursula Braun3881ac42011-08-08 01:33:54 +00002232
Ursula Braun800c5eb2012-02-08 00:19:47 +00002233 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
Ursula Braun3881ac42011-08-08 01:33:54 +00002234 return;
2235
Ursula Braun3881ac42011-08-08 01:33:54 +00002236 list = &iucv->send_skb_q;
Ursula Braun800c5eb2012-02-08 00:19:47 +00002237 spin_lock_irqsave(&list->lock, flags);
Ursula Braun3881ac42011-08-08 01:33:54 +00002238 if (skb_queue_empty(list))
2239 goto out_unlock;
Ursula Braun800c5eb2012-02-08 00:19:47 +00002240 list_skb = list->next;
2241 nskb = list_skb->next;
Ursula Braun3881ac42011-08-08 01:33:54 +00002242 while (list_skb != (struct sk_buff *)list) {
2243 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
Ursula Braun3881ac42011-08-08 01:33:54 +00002244 switch (n) {
2245 case TX_NOTIFY_OK:
Ursula Braun800c5eb2012-02-08 00:19:47 +00002246 __skb_unlink(list_skb, list);
2247 kfree_skb(list_skb);
Ursula Braun3881ac42011-08-08 01:33:54 +00002248 iucv_sock_wake_msglim(sk);
Ursula Braun3881ac42011-08-08 01:33:54 +00002249 break;
2250 case TX_NOTIFY_PENDING:
2251 atomic_inc(&iucv->pendings);
2252 break;
2253 case TX_NOTIFY_DELAYED_OK:
Ursula Braun800c5eb2012-02-08 00:19:47 +00002254 __skb_unlink(list_skb, list);
Ursula Braun3881ac42011-08-08 01:33:54 +00002255 atomic_dec(&iucv->pendings);
2256 if (atomic_read(&iucv->pendings) <= 0)
2257 iucv_sock_wake_msglim(sk);
Ursula Braun800c5eb2012-02-08 00:19:47 +00002258 kfree_skb(list_skb);
Ursula Braun3881ac42011-08-08 01:33:54 +00002259 break;
2260 case TX_NOTIFY_UNREACHABLE:
2261 case TX_NOTIFY_DELAYED_UNREACHABLE:
2262 case TX_NOTIFY_TPQFULL: /* not yet used */
2263 case TX_NOTIFY_GENERALERROR:
2264 case TX_NOTIFY_DELAYED_GENERALERROR:
Ursula Braun800c5eb2012-02-08 00:19:47 +00002265 __skb_unlink(list_skb, list);
2266 kfree_skb(list_skb);
2267 if (sk->sk_state == IUCV_CONNECTED) {
2268 sk->sk_state = IUCV_DISCONN;
2269 sk->sk_state_change(sk);
2270 }
Ursula Braun3881ac42011-08-08 01:33:54 +00002271 break;
2272 }
2273 break;
2274 }
Ursula Braun800c5eb2012-02-08 00:19:47 +00002275 list_skb = nskb;
2276 nskb = nskb->next;
Ursula Braun3881ac42011-08-08 01:33:54 +00002277 }
Ursula Braun800c5eb2012-02-08 00:19:47 +00002278out_unlock:
Ursula Braun3881ac42011-08-08 01:33:54 +00002279 spin_unlock_irqrestore(&list->lock, flags);
2280
Ursula Braun42bd48e2011-12-19 22:56:28 +00002281 if (sk->sk_state == IUCV_CLOSING) {
2282 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2283 sk->sk_state = IUCV_CLOSED;
2284 sk->sk_state_change(sk);
2285 }
2286 }
2287
Ursula Braun3881ac42011-08-08 01:33:54 +00002288}
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002289
2290/*
2291 * afiucv_netdev_event: handle netdev notifier chain events
2292 */
2293static int afiucv_netdev_event(struct notifier_block *this,
2294 unsigned long event, void *ptr)
2295{
Jiri Pirko351638e2013-05-28 01:30:21 +00002296 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002297 struct sock *sk;
2298 struct iucv_sock *iucv;
2299
2300 switch (event) {
2301 case NETDEV_REBOOT:
2302 case NETDEV_GOING_DOWN:
Sasha Levinb67bfe02013-02-27 17:06:00 -08002303 sk_for_each(sk, &iucv_sk_list.head) {
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002304 iucv = iucv_sk(sk);
2305 if ((iucv->hs_dev == event_dev) &&
2306 (sk->sk_state == IUCV_CONNECTED)) {
2307 if (event == NETDEV_GOING_DOWN)
2308 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2309 sk->sk_state = IUCV_DISCONN;
2310 sk->sk_state_change(sk);
2311 }
2312 }
2313 break;
2314 case NETDEV_DOWN:
2315 case NETDEV_UNREGISTER:
2316 default:
2317 break;
2318 }
2319 return NOTIFY_DONE;
2320}
2321
2322static struct notifier_block afiucv_netdev_notifier = {
2323 .notifier_call = afiucv_netdev_event,
2324};
2325
Alexey Dobriyan5708e862009-09-14 12:23:23 +00002326static const struct proto_ops iucv_sock_ops = {
Jennifer Hunteac37312007-02-08 13:51:54 -08002327 .family = PF_IUCV,
2328 .owner = THIS_MODULE,
2329 .release = iucv_sock_release,
2330 .bind = iucv_sock_bind,
2331 .connect = iucv_sock_connect,
2332 .listen = iucv_sock_listen,
2333 .accept = iucv_sock_accept,
2334 .getname = iucv_sock_getname,
2335 .sendmsg = iucv_sock_sendmsg,
2336 .recvmsg = iucv_sock_recvmsg,
2337 .poll = iucv_sock_poll,
2338 .ioctl = sock_no_ioctl,
2339 .mmap = sock_no_mmap,
2340 .socketpair = sock_no_socketpair,
2341 .shutdown = iucv_sock_shutdown,
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00002342 .setsockopt = iucv_sock_setsockopt,
2343 .getsockopt = iucv_sock_getsockopt,
Jennifer Hunteac37312007-02-08 13:51:54 -08002344};
2345
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00002346static const struct net_proto_family iucv_sock_family_ops = {
Jennifer Hunteac37312007-02-08 13:51:54 -08002347 .family = AF_IUCV,
2348 .owner = THIS_MODULE,
2349 .create = iucv_sock_create,
2350};
2351
Ursula Braun3881ac42011-08-08 01:33:54 +00002352static struct packet_type iucv_packet_type = {
2353 .type = cpu_to_be16(ETH_P_AF_IUCV),
2354 .func = afiucv_hs_rcv,
2355};
2356
2357static int afiucv_iucv_init(void)
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002358{
2359 int err;
2360
2361 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2362 if (err)
2363 goto out;
2364 /* establish dummy device */
2365 af_iucv_driver.bus = pr_iucv->bus;
2366 err = driver_register(&af_iucv_driver);
2367 if (err)
2368 goto out_iucv;
2369 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2370 if (!af_iucv_dev) {
2371 err = -ENOMEM;
2372 goto out_driver;
2373 }
2374 dev_set_name(af_iucv_dev, "af_iucv");
2375 af_iucv_dev->bus = pr_iucv->bus;
2376 af_iucv_dev->parent = pr_iucv->root;
2377 af_iucv_dev->release = (void (*)(struct device *))kfree;
2378 af_iucv_dev->driver = &af_iucv_driver;
2379 err = device_register(af_iucv_dev);
2380 if (err)
2381 goto out_driver;
2382 return 0;
2383
2384out_driver:
2385 driver_unregister(&af_iucv_driver);
2386out_iucv:
2387 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2388out:
2389 return err;
2390}
2391
Heiko Carstensda99f052007-05-04 12:23:27 -07002392static int __init afiucv_init(void)
Jennifer Hunteac37312007-02-08 13:51:54 -08002393{
2394 int err;
2395
Ursula Braun3881ac42011-08-08 01:33:54 +00002396 if (MACHINE_IS_VM) {
2397 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2398 if (unlikely(err)) {
2399 WARN_ON(err);
2400 err = -EPROTONOSUPPORT;
2401 goto out;
2402 }
Jennifer Hunteac37312007-02-08 13:51:54 -08002403
Ursula Braun3881ac42011-08-08 01:33:54 +00002404 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2405 if (!pr_iucv) {
2406 printk(KERN_WARNING "iucv_if lookup failed\n");
2407 memset(&iucv_userid, 0, sizeof(iucv_userid));
2408 }
2409 } else {
2410 memset(&iucv_userid, 0, sizeof(iucv_userid));
2411 pr_iucv = NULL;
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002412 }
2413
Jennifer Hunteac37312007-02-08 13:51:54 -08002414 err = proto_register(&iucv_proto, 0);
2415 if (err)
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002416 goto out;
Jennifer Hunteac37312007-02-08 13:51:54 -08002417 err = sock_register(&iucv_sock_family_ops);
2418 if (err)
2419 goto out_proto;
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002420
Ursula Braun3881ac42011-08-08 01:33:54 +00002421 if (pr_iucv) {
2422 err = afiucv_iucv_init();
2423 if (err)
2424 goto out_sock;
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002425 } else
2426 register_netdevice_notifier(&afiucv_netdev_notifier);
Ursula Braun3881ac42011-08-08 01:33:54 +00002427 dev_add_pack(&iucv_packet_type);
Jennifer Hunteac37312007-02-08 13:51:54 -08002428 return 0;
2429
Ursula Braunc23cad92009-06-16 10:30:44 +02002430out_sock:
2431 sock_unregister(PF_IUCV);
Jennifer Hunteac37312007-02-08 13:51:54 -08002432out_proto:
2433 proto_unregister(&iucv_proto);
Jennifer Hunteac37312007-02-08 13:51:54 -08002434out:
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002435 if (pr_iucv)
2436 symbol_put(iucv_if);
Jennifer Hunteac37312007-02-08 13:51:54 -08002437 return err;
2438}
2439
2440static void __exit afiucv_exit(void)
2441{
Ursula Braun3881ac42011-08-08 01:33:54 +00002442 if (pr_iucv) {
2443 device_unregister(af_iucv_dev);
2444 driver_unregister(&af_iucv_driver);
2445 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2446 symbol_put(iucv_if);
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002447 } else
2448 unregister_netdevice_notifier(&afiucv_netdev_notifier);
Ursula Braun3881ac42011-08-08 01:33:54 +00002449 dev_remove_pack(&iucv_packet_type);
Jennifer Hunteac37312007-02-08 13:51:54 -08002450 sock_unregister(PF_IUCV);
2451 proto_unregister(&iucv_proto);
Jennifer Hunteac37312007-02-08 13:51:54 -08002452}
2453
2454module_init(afiucv_init);
2455module_exit(afiucv_exit);
2456
2457MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2458MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2459MODULE_VERSION(VERSION);
2460MODULE_LICENSE("GPL");
2461MODULE_ALIAS_NETPROTO(PF_IUCV);
Ursula Braun3881ac42011-08-08 01:33:54 +00002462