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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>
Paul Moore02f06912016-06-07 10:30:53 -040025#include <linux/security.h>
Jennifer Hunteac37312007-02-08 13:51:54 -080026#include <net/sock.h>
27#include <asm/ebcdic.h>
28#include <asm/cpcmd.h>
29#include <linux/kmod.h>
30
Jennifer Hunteac37312007-02-08 13:51:54 -080031#include <net/iucv/af_iucv.h>
32
Ursula Braun3881ac42011-08-08 01:33:54 +000033#define VERSION "1.2"
Jennifer Hunteac37312007-02-08 13:51:54 -080034
35static char iucv_userid[80];
36
Alexey Dobriyan5708e862009-09-14 12:23:23 +000037static const struct proto_ops iucv_sock_ops;
Jennifer Hunteac37312007-02-08 13:51:54 -080038
39static struct proto iucv_proto = {
40 .name = "AF_IUCV",
41 .owner = THIS_MODULE,
42 .obj_size = sizeof(struct iucv_sock),
43};
44
Frank Blaschka6fcd61f2011-08-08 01:33:51 +000045static struct iucv_interface *pr_iucv;
46
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +000047/* special AF_IUCV IPRM messages */
48static const u8 iprm_shutdown[8] =
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
50
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +000051#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
52
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +000053#define __iucv_sock_wait(sk, condition, timeo, ret) \
54do { \
55 DEFINE_WAIT(__wait); \
56 long __timeo = timeo; \
57 ret = 0; \
Eric Dumazetaa395142010-04-20 13:03:51 +000058 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +000059 while (!(condition)) { \
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +000060 if (!__timeo) { \
61 ret = -EAGAIN; \
62 break; \
63 } \
64 if (signal_pending(current)) { \
65 ret = sock_intr_errno(__timeo); \
66 break; \
67 } \
68 release_sock(sk); \
69 __timeo = schedule_timeout(__timeo); \
70 lock_sock(sk); \
71 ret = sock_error(sk); \
72 if (ret) \
73 break; \
74 } \
Eric Dumazetaa395142010-04-20 13:03:51 +000075 finish_wait(sk_sleep(sk), &__wait); \
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +000076} while (0)
77
78#define iucv_sock_wait(sk, condition, timeo) \
79({ \
80 int __ret = 0; \
81 if (!(condition)) \
82 __iucv_sock_wait(sk, condition, timeo, __ret); \
83 __ret; \
84})
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +000085
Heiko Carstens57f20442007-10-08 02:02:52 -070086static void iucv_sock_kill(struct sock *sk);
87static void iucv_sock_close(struct sock *sk);
Ursula Braun7d316b92012-02-08 00:19:45 +000088static void iucv_sever_path(struct sock *, int);
Heiko Carstens57f20442007-10-08 02:02:52 -070089
Ursula Braun3881ac42011-08-08 01:33:54 +000090static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
91 struct packet_type *pt, struct net_device *orig_dev);
92static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
93 struct sk_buff *skb, u8 flags);
94static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
95
Jennifer Hunteac37312007-02-08 13:51:54 -080096/* Call Back functions */
97static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
98static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
Ursula Braun91e60eb2015-09-18 16:06:52 +020099static void iucv_callback_connack(struct iucv_path *, u8 *);
100static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101static void iucv_callback_connrej(struct iucv_path *, u8 *);
102static void iucv_callback_shutdown(struct iucv_path *, u8 *);
Jennifer Hunteac37312007-02-08 13:51:54 -0800103
104static struct iucv_sock_list iucv_sk_list = {
Robert P. J. Day3db8ce32008-04-10 02:11:24 -0700105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
Jennifer Hunteac37312007-02-08 13:51:54 -0800106 .autobind_name = ATOMIC_INIT(0)
107};
108
109static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
Hendrik Brueckneraf88b522009-04-21 23:26:21 +0000114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
Jennifer Hunteac37312007-02-08 13:51:54 -0800116};
117
118static inline void high_nmcpy(unsigned char *dst, char *src)
119{
120 memcpy(dst, src, 8);
121}
122
123static inline void low_nmcpy(unsigned char *dst, char *src)
124{
125 memcpy(&dst[8], src, 8);
126}
127
Ursula Braunc23cad92009-06-16 10:30:44 +0200128static int afiucv_pm_prepare(struct device *dev)
129{
130#ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132#endif
133 return 0;
134}
135
136static void afiucv_pm_complete(struct device *dev)
137{
138#ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140#endif
Ursula Braunc23cad92009-06-16 10:30:44 +0200141}
142
143/**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149static int afiucv_pm_freeze(struct device *dev)
150{
151 struct iucv_sock *iucv;
152 struct sock *sk;
Ursula Braunc23cad92009-06-16 10:30:44 +0200153 int err = 0;
154
155#ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157#endif
158 read_lock(&iucv_sk_list.lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800159 sk_for_each(sk, &iucv_sk_list.head) {
Ursula Braunc23cad92009-06-16 10:30:44 +0200160 iucv = iucv_sk(sk);
Ursula Braunc23cad92009-06-16 10:30:44 +0200161 switch (sk->sk_state) {
Ursula Braunc23cad92009-06-16 10:30:44 +0200162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
Ursula Braun7d316b92012-02-08 00:19:45 +0000165 iucv_sever_path(sk, 0);
Ursula Braunc23cad92009-06-16 10:30:44 +0200166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
Ursula Braun7d316b92012-02-08 00:19:45 +0000174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
Ursula Braunc23cad92009-06-16 10:30:44 +0200176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179}
180
181/**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187static int afiucv_pm_restore_thaw(struct device *dev)
188{
Ursula Braunc23cad92009-06-16 10:30:44 +0200189 struct sock *sk;
Ursula Braunc23cad92009-06-16 10:30:44 +0200190
191#ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193#endif
194 read_lock(&iucv_sk_list.lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800195 sk_for_each(sk, &iucv_sk_list.head) {
Ursula Braunc23cad92009-06-16 10:30:44 +0200196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
Ursula Braunc23cad92009-06-16 10:30:44 +0200203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213}
214
Alexey Dobriyan47145212009-12-14 18:00:08 -0800215static const struct dev_pm_ops afiucv_pm_ops = {
Ursula Braunc23cad92009-06-16 10:30:44 +0200216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221};
222
223static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
Frank Blaschka6fcd61f2011-08-08 01:33:51 +0000226 .bus = NULL,
Ursula Braunc23cad92009-06-16 10:30:44 +0200227 .pm = &afiucv_pm_ops,
228};
229
230/* dummy device used as trigger for PM functions */
231static struct device *af_iucv_dev;
232
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +0000233/**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300245 * The socket data length is computed by subtracting the socket data length
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +0000246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253static inline size_t iucv_msg_length(struct iucv_message *msg)
254{
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262}
263
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000264/**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273{
274 return (sk->sk_state == state || sk->sk_state == state2);
275}
276
277/**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285static inline int iucv_below_msglim(struct sock *sk)
286{
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
Ursula Braun3881ac42011-08-08 01:33:54 +0000291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000296}
297
298/**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301static void iucv_sock_wake_msglim(struct sock *sk)
302{
Eric Dumazet43815482010-04-29 11:01:49 +0000303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
Herbert Xu1ce0bf52015-11-26 13:55:39 +0800307 if (skwq_has_sleeper(wq))
Eric Dumazet43815482010-04-29 11:01:49 +0000308 wake_up_interruptible_all(&wq->wait);
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
Eric Dumazet43815482010-04-29 11:01:49 +0000310 rcu_read_unlock();
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000311}
312
Ursula Braun3881ac42011-08-08 01:33:54 +0000313/**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318{
Ursula Braun3881ac42011-08-08 01:33:54 +0000319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
341 if (confirm_recv)
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 }
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 if (imsg)
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354
Ursula Braun800c5eb2012-02-08 00:19:47 +0000355 skb->dev = iucv->hs_dev;
Ursula Braun3881ac42011-08-08 01:33:54 +0000356 if (!skb->dev)
357 return -ENODEV;
Ursula Braun800c5eb2012-02-08 00:19:47 +0000358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
Ursula Braun3881ac42011-08-08 01:33:54 +0000359 return -ENETDOWN;
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
362 return -EMSGSIZE;
363 else
364 skb_trim(skb, skb->dev->mtu);
365 }
366 skb->protocol = ETH_P_AF_IUCV;
Ursula Braun3881ac42011-08-08 01:33:54 +0000367 nskb = skb_clone(skb, GFP_ATOMIC);
368 if (!nskb)
369 return -ENOMEM;
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
Ursula Braun800c5eb2012-02-08 00:19:47 +0000372 if (net_xmit_eval(err)) {
Ursula Braun3881ac42011-08-08 01:33:54 +0000373 skb_unlink(nskb, &iucv->send_skb_q);
374 kfree_skb(nskb);
375 } else {
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 }
Ursula Braun800c5eb2012-02-08 00:19:47 +0000379 return net_xmit_eval(err);
Ursula Braun3881ac42011-08-08 01:33:54 +0000380}
381
Jennifer Hunteac37312007-02-08 13:51:54 -0800382static struct sock *__iucv_get_sock_by_name(char *nm)
383{
384 struct sock *sk;
Jennifer Hunteac37312007-02-08 13:51:54 -0800385
Sasha Levinb67bfe02013-02-27 17:06:00 -0800386 sk_for_each(sk, &iucv_sk_list.head)
Jennifer Hunteac37312007-02-08 13:51:54 -0800387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
388 return sk;
389
390 return NULL;
391}
392
393static void iucv_sock_destruct(struct sock *sk)
394{
395 skb_queue_purge(&sk->sk_receive_queue);
Ursula Braun82492a32012-03-07 02:06:24 +0000396 skb_queue_purge(&sk->sk_error_queue);
397
398 sk_mem_reclaim(sk);
399
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
402 return;
403 }
404
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
Jennifer Hunteac37312007-02-08 13:51:54 -0800409}
410
411/* Cleanup Listen */
412static void iucv_sock_cleanup_listen(struct sock *parent)
413{
414 struct sock *sk;
415
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
418 iucv_sock_close(sk);
419 iucv_sock_kill(sk);
420 }
421
422 parent->sk_state = IUCV_CLOSED;
Jennifer Hunteac37312007-02-08 13:51:54 -0800423}
424
Hendrik Brueckner7514bab2009-09-16 04:37:27 +0000425/* Kill socket (only if zapped and orphaned) */
Jennifer Hunteac37312007-02-08 13:51:54 -0800426static void iucv_sock_kill(struct sock *sk)
427{
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
429 return;
430
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
433 sock_put(sk);
434}
435
Ursula Braun7d316b92012-02-08 00:19:45 +0000436/* Terminate an IUCV path */
437static void iucv_sever_path(struct sock *sk, int with_user_data)
438{
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
442
443 if (iucv->path) {
444 iucv->path = NULL;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
450 } else
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
453 }
454}
455
Ursula Braun4e0ad322016-10-07 15:51:47 +0200456/* Send controlling flags through an IUCV socket for HIPER transport */
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000457static int iucv_send_ctrl(struct sock *sk, u8 flags)
458{
459 int err = 0;
460 int blen;
461 struct sk_buff *skb;
Ursula Braun4e0ad322016-10-07 15:51:47 +0200462 u8 shutdown = 0;
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000463
464 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
Ursula Braun4e0ad322016-10-07 15:51:47 +0200465 if (sk->sk_shutdown & SEND_SHUTDOWN) {
466 /* controlling flags should be sent anyway */
467 shutdown = sk->sk_shutdown;
468 sk->sk_shutdown &= RCV_SHUTDOWN;
469 }
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000470 skb = sock_alloc_send_skb(sk, blen, 1, &err);
471 if (skb) {
472 skb_reserve(skb, blen);
473 err = afiucv_hs_send(NULL, sk, skb, flags);
474 }
Ursula Braun4e0ad322016-10-07 15:51:47 +0200475 if (shutdown)
476 sk->sk_shutdown = shutdown;
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000477 return err;
478}
479
Jennifer Hunteac37312007-02-08 13:51:54 -0800480/* Close an IUCV socket */
481static void iucv_sock_close(struct sock *sk)
482{
Jennifer Hunteac37312007-02-08 13:51:54 -0800483 struct iucv_sock *iucv = iucv_sk(sk);
Jennifer Hunt561e0362007-05-04 12:22:07 -0700484 unsigned long timeo;
Ursula Braun800c5eb2012-02-08 00:19:47 +0000485 int err = 0;
Jennifer Hunteac37312007-02-08 13:51:54 -0800486
Jennifer Hunteac37312007-02-08 13:51:54 -0800487 lock_sock(sk);
488
Heiko Carstensda99f052007-05-04 12:23:27 -0700489 switch (sk->sk_state) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800490 case IUCV_LISTEN:
491 iucv_sock_cleanup_listen(sk);
492 break;
493
494 case IUCV_CONNECTED:
Ursula Braun3881ac42011-08-08 01:33:54 +0000495 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000496 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
Ursula Braun3881ac42011-08-08 01:33:54 +0000497 sk->sk_state = IUCV_DISCONN;
498 sk->sk_state_change(sk);
499 }
Ursula Braun816abba2011-12-19 22:56:29 +0000500 case IUCV_DISCONN: /* fall through */
Jennifer Hunt561e0362007-05-04 12:22:07 -0700501 sk->sk_state = IUCV_CLOSING;
502 sk->sk_state_change(sk);
503
Ursula Braun800c5eb2012-02-08 00:19:47 +0000504 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
Jennifer Hunt561e0362007-05-04 12:22:07 -0700505 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
506 timeo = sk->sk_lingertime;
507 else
508 timeo = IUCV_DISCONN_TIMEOUT;
Ursula Braun9f6298a2011-05-12 18:45:08 +0000509 iucv_sock_wait(sk,
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000510 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
511 timeo);
Jennifer Hunt561e0362007-05-04 12:22:07 -0700512 }
513
Ursula Braunbbe188c2009-04-21 06:04:20 +0000514 case IUCV_CLOSING: /* fall through */
Jennifer Hunt561e0362007-05-04 12:22:07 -0700515 sk->sk_state = IUCV_CLOSED;
516 sk->sk_state_change(sk);
517
Jennifer Hunteac37312007-02-08 13:51:54 -0800518 sk->sk_err = ECONNRESET;
519 sk->sk_state_change(sk);
520
Ursula Braun800c5eb2012-02-08 00:19:47 +0000521 skb_queue_purge(&iucv->send_skb_q);
Jennifer Hunt561e0362007-05-04 12:22:07 -0700522 skb_queue_purge(&iucv->backlog_skb_q);
Jennifer Hunteac37312007-02-08 13:51:54 -0800523
Ursula Braun7d316b92012-02-08 00:19:45 +0000524 default: /* fall through */
525 iucv_sever_path(sk, 1);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700526 }
Jennifer Hunteac37312007-02-08 13:51:54 -0800527
Ursula Braun800c5eb2012-02-08 00:19:47 +0000528 if (iucv->hs_dev) {
529 dev_put(iucv->hs_dev);
530 iucv->hs_dev = NULL;
531 sk->sk_bound_dev_if = 0;
532 }
533
Hendrik Brueckner7514bab2009-09-16 04:37:27 +0000534 /* mark socket for deletion by iucv_sock_kill() */
535 sock_set_flag(sk, SOCK_ZAPPED);
536
Jennifer Hunteac37312007-02-08 13:51:54 -0800537 release_sock(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800538}
539
540static void iucv_sock_init(struct sock *sk, struct sock *parent)
541{
Paul Moore02f06912016-06-07 10:30:53 -0400542 if (parent) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800543 sk->sk_type = parent->sk_type;
Paul Moore02f06912016-06-07 10:30:53 -0400544 security_sk_clone(parent, sk);
545 }
Jennifer Hunteac37312007-02-08 13:51:54 -0800546}
547
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500548static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
Jennifer Hunteac37312007-02-08 13:51:54 -0800549{
550 struct sock *sk;
Ursula Braun493d3972011-08-08 01:33:52 +0000551 struct iucv_sock *iucv;
Jennifer Hunteac37312007-02-08 13:51:54 -0800552
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500553 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
Jennifer Hunteac37312007-02-08 13:51:54 -0800554 if (!sk)
555 return NULL;
Ursula Braun493d3972011-08-08 01:33:52 +0000556 iucv = iucv_sk(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800557
558 sock_init_data(sock, sk);
Ursula Braun493d3972011-08-08 01:33:52 +0000559 INIT_LIST_HEAD(&iucv->accept_q);
560 spin_lock_init(&iucv->accept_q_lock);
561 skb_queue_head_init(&iucv->send_skb_q);
562 INIT_LIST_HEAD(&iucv->message_q.list);
563 spin_lock_init(&iucv->message_q.lock);
564 skb_queue_head_init(&iucv->backlog_skb_q);
565 iucv->send_tag = 0;
Ursula Braun3881ac42011-08-08 01:33:54 +0000566 atomic_set(&iucv->pendings, 0);
Ursula Braun493d3972011-08-08 01:33:52 +0000567 iucv->flags = 0;
Ursula Braun3881ac42011-08-08 01:33:54 +0000568 iucv->msglimit = 0;
569 atomic_set(&iucv->msg_sent, 0);
570 atomic_set(&iucv->msg_recv, 0);
Ursula Braun493d3972011-08-08 01:33:52 +0000571 iucv->path = NULL;
Ursula Braun3881ac42011-08-08 01:33:54 +0000572 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
Ursula Braun493d3972011-08-08 01:33:52 +0000573 memset(&iucv->src_user_id , 0, 32);
Ursula Braun3881ac42011-08-08 01:33:54 +0000574 if (pr_iucv)
575 iucv->transport = AF_IUCV_TRANS_IUCV;
576 else
577 iucv->transport = AF_IUCV_TRANS_HIPER;
Jennifer Hunteac37312007-02-08 13:51:54 -0800578
579 sk->sk_destruct = iucv_sock_destruct;
580 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
581 sk->sk_allocation = GFP_DMA;
582
583 sock_reset_flag(sk, SOCK_ZAPPED);
584
585 sk->sk_protocol = proto;
586 sk->sk_state = IUCV_OPEN;
587
Jennifer Hunteac37312007-02-08 13:51:54 -0800588 iucv_sock_link(&iucv_sk_list, sk);
589 return sk;
590}
591
592/* Create an IUCV socket */
Eric Paris3f378b62009-11-05 22:18:14 -0800593static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
594 int kern)
Jennifer Hunteac37312007-02-08 13:51:54 -0800595{
596 struct sock *sk;
597
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +0000598 if (protocol && protocol != PF_IUCV)
599 return -EPROTONOSUPPORT;
Jennifer Hunteac37312007-02-08 13:51:54 -0800600
601 sock->state = SS_UNCONNECTED;
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +0000602
603 switch (sock->type) {
604 case SOCK_STREAM:
605 sock->ops = &iucv_sock_ops;
606 break;
607 case SOCK_SEQPACKET:
608 /* currently, proto ops can handle both sk types */
609 sock->ops = &iucv_sock_ops;
610 break;
611 default:
612 return -ESOCKTNOSUPPORT;
613 }
Jennifer Hunteac37312007-02-08 13:51:54 -0800614
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500615 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
Jennifer Hunteac37312007-02-08 13:51:54 -0800616 if (!sk)
617 return -ENOMEM;
618
619 iucv_sock_init(sk, NULL);
620
621 return 0;
622}
623
624void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
625{
626 write_lock_bh(&l->lock);
627 sk_add_node(sk, &l->head);
628 write_unlock_bh(&l->lock);
629}
630
631void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
632{
633 write_lock_bh(&l->lock);
634 sk_del_node_init(sk);
635 write_unlock_bh(&l->lock);
636}
637
638void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
639{
Ursula Braunfebca282007-07-14 19:04:25 -0700640 unsigned long flags;
641 struct iucv_sock *par = iucv_sk(parent);
642
Jennifer Hunteac37312007-02-08 13:51:54 -0800643 sock_hold(sk);
Ursula Braunfebca282007-07-14 19:04:25 -0700644 spin_lock_irqsave(&par->accept_q_lock, flags);
645 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
646 spin_unlock_irqrestore(&par->accept_q_lock, flags);
Jennifer Hunteac37312007-02-08 13:51:54 -0800647 iucv_sk(sk)->parent = parent;
Hendrik Brueckner49f5eba2009-10-14 22:54:55 +0000648 sk_acceptq_added(parent);
Jennifer Hunteac37312007-02-08 13:51:54 -0800649}
650
651void iucv_accept_unlink(struct sock *sk)
652{
Ursula Braunfebca282007-07-14 19:04:25 -0700653 unsigned long flags;
654 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
655
656 spin_lock_irqsave(&par->accept_q_lock, flags);
Jennifer Hunteac37312007-02-08 13:51:54 -0800657 list_del_init(&iucv_sk(sk)->accept_q);
Ursula Braunfebca282007-07-14 19:04:25 -0700658 spin_unlock_irqrestore(&par->accept_q_lock, flags);
Hendrik Brueckner49f5eba2009-10-14 22:54:55 +0000659 sk_acceptq_removed(iucv_sk(sk)->parent);
Jennifer Hunteac37312007-02-08 13:51:54 -0800660 iucv_sk(sk)->parent = NULL;
661 sock_put(sk);
662}
663
664struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
665{
666 struct iucv_sock *isk, *n;
667 struct sock *sk;
668
Heiko Carstensda99f052007-05-04 12:23:27 -0700669 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800670 sk = (struct sock *) isk;
671 lock_sock(sk);
672
673 if (sk->sk_state == IUCV_CLOSED) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800674 iucv_accept_unlink(sk);
Ursula Braunfebca282007-07-14 19:04:25 -0700675 release_sock(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800676 continue;
677 }
678
679 if (sk->sk_state == IUCV_CONNECTED ||
Ursula Braunaac63992011-12-19 22:56:31 +0000680 sk->sk_state == IUCV_DISCONN ||
Jennifer Hunteac37312007-02-08 13:51:54 -0800681 !newsock) {
682 iucv_accept_unlink(sk);
683 if (newsock)
684 sock_graft(sk, newsock);
685
Jennifer Hunteac37312007-02-08 13:51:54 -0800686 release_sock(sk);
687 return sk;
688 }
689
690 release_sock(sk);
691 }
692 return NULL;
693}
694
Philipp Hachtmann53a4b492014-05-28 10:22:28 +0200695static void __iucv_auto_name(struct iucv_sock *iucv)
696{
697 char name[12];
698
699 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
700 while (__iucv_get_sock_by_name(name)) {
701 sprintf(name, "%08x",
702 atomic_inc_return(&iucv_sk_list.autobind_name));
703 }
704 memcpy(iucv->src_name, name, 8);
705}
706
Jennifer Hunteac37312007-02-08 13:51:54 -0800707/* Bind an unbound socket */
708static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
709 int addr_len)
710{
711 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
712 struct sock *sk = sock->sk;
713 struct iucv_sock *iucv;
Ursula Braun3881ac42011-08-08 01:33:54 +0000714 int err = 0;
715 struct net_device *dev;
716 char uid[9];
Jennifer Hunteac37312007-02-08 13:51:54 -0800717
718 /* Verify the input sockaddr */
719 if (!addr || addr->sa_family != AF_IUCV)
720 return -EINVAL;
721
Ursula Braun52a82e22016-01-19 10:41:33 +0100722 if (addr_len < sizeof(struct sockaddr_iucv))
723 return -EINVAL;
724
Jennifer Hunteac37312007-02-08 13:51:54 -0800725 lock_sock(sk);
726 if (sk->sk_state != IUCV_OPEN) {
727 err = -EBADFD;
728 goto done;
729 }
730
731 write_lock_bh(&iucv_sk_list.lock);
732
733 iucv = iucv_sk(sk);
734 if (__iucv_get_sock_by_name(sa->siucv_name)) {
735 err = -EADDRINUSE;
736 goto done_unlock;
737 }
Ursula Braun3881ac42011-08-08 01:33:54 +0000738 if (iucv->path)
Jennifer Hunteac37312007-02-08 13:51:54 -0800739 goto done_unlock;
Jennifer Hunteac37312007-02-08 13:51:54 -0800740
741 /* Bind the socket */
Ursula Braun3881ac42011-08-08 01:33:54 +0000742 if (pr_iucv)
743 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
744 goto vm_bind; /* VM IUCV transport */
Jennifer Hunteac37312007-02-08 13:51:54 -0800745
Ursula Braun3881ac42011-08-08 01:33:54 +0000746 /* try hiper transport */
747 memcpy(uid, sa->siucv_user_id, sizeof(uid));
748 ASCEBC(uid, 8);
749 rcu_read_lock();
750 for_each_netdev_rcu(&init_net, dev) {
751 if (!memcmp(dev->perm_addr, uid, 8)) {
Ursula Braun3881ac42011-08-08 01:33:54 +0000752 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
Philipp Hachtmann53a4b492014-05-28 10:22:28 +0200753 /* Check for unitialized siucv_name */
754 if (strncmp(sa->siucv_name, " ", 8) == 0)
755 __iucv_auto_name(iucv);
756 else
757 memcpy(iucv->src_name, sa->siucv_name, 8);
Ursula Braun816abba2011-12-19 22:56:29 +0000758 sk->sk_bound_dev_if = dev->ifindex;
Ursula Braun800c5eb2012-02-08 00:19:47 +0000759 iucv->hs_dev = dev;
760 dev_hold(dev);
Ursula Braun3881ac42011-08-08 01:33:54 +0000761 sk->sk_state = IUCV_BOUND;
762 iucv->transport = AF_IUCV_TRANS_HIPER;
763 if (!iucv->msglimit)
764 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
765 rcu_read_unlock();
766 goto done_unlock;
767 }
768 }
769 rcu_read_unlock();
770vm_bind:
771 if (pr_iucv) {
772 /* use local userid for backward compat */
773 memcpy(iucv->src_name, sa->siucv_name, 8);
774 memcpy(iucv->src_user_id, iucv_userid, 8);
775 sk->sk_state = IUCV_BOUND;
776 iucv->transport = AF_IUCV_TRANS_IUCV;
777 if (!iucv->msglimit)
778 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
779 goto done_unlock;
780 }
781 /* found no dev to bind */
782 err = -ENODEV;
Jennifer Hunteac37312007-02-08 13:51:54 -0800783done_unlock:
784 /* Release the socket list lock */
785 write_unlock_bh(&iucv_sk_list.lock);
786done:
787 release_sock(sk);
788 return err;
789}
790
791/* Automatically bind an unbound socket */
792static int iucv_sock_autobind(struct sock *sk)
793{
794 struct iucv_sock *iucv = iucv_sk(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800795 int err = 0;
796
Ursula Braunaac63992011-12-19 22:56:31 +0000797 if (unlikely(!pr_iucv))
Jennifer Hunteac37312007-02-08 13:51:54 -0800798 return -EPROTO;
799
Ursula Braunaac63992011-12-19 22:56:31 +0000800 memcpy(iucv->src_user_id, iucv_userid, 8);
Jennifer Hunteac37312007-02-08 13:51:54 -0800801
802 write_lock_bh(&iucv_sk_list.lock);
Philipp Hachtmann53a4b492014-05-28 10:22:28 +0200803 __iucv_auto_name(iucv);
Jennifer Hunteac37312007-02-08 13:51:54 -0800804 write_unlock_bh(&iucv_sk_list.lock);
805
Ursula Braun3881ac42011-08-08 01:33:54 +0000806 if (!iucv->msglimit)
807 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
808
Jennifer Hunteac37312007-02-08 13:51:54 -0800809 return err;
810}
811
Ursula Braun3881ac42011-08-08 01:33:54 +0000812static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
Jennifer Hunteac37312007-02-08 13:51:54 -0800813{
814 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
815 struct sock *sk = sock->sk;
Ursula Braun493d3972011-08-08 01:33:52 +0000816 struct iucv_sock *iucv = iucv_sk(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800817 unsigned char user_data[16];
818 int err;
819
Jennifer Hunteac37312007-02-08 13:51:54 -0800820 high_nmcpy(user_data, sa->siucv_name);
Ursula Braun493d3972011-08-08 01:33:52 +0000821 low_nmcpy(user_data, iucv->src_name);
Jennifer Hunteac37312007-02-08 13:51:54 -0800822 ASCEBC(user_data, sizeof(user_data));
823
Jennifer Hunteac37312007-02-08 13:51:54 -0800824 /* Create path. */
Hendrik Brueckner09488e22009-04-21 23:26:27 +0000825 iucv->path = iucv_path_alloc(iucv->msglimit,
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +0000826 IUCV_IPRMDATA, GFP_KERNEL);
Ursula Braund4444722008-02-07 18:07:19 -0800827 if (!iucv->path) {
828 err = -ENOMEM;
829 goto done;
830 }
Frank Blaschka6fcd61f2011-08-08 01:33:51 +0000831 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
832 sa->siucv_user_id, NULL, user_data,
833 sk);
Jennifer Hunteac37312007-02-08 13:51:54 -0800834 if (err) {
835 iucv_path_free(iucv->path);
836 iucv->path = NULL;
Hendrik Brueckner55cdea92009-01-05 18:07:07 -0800837 switch (err) {
838 case 0x0b: /* Target communicator is not logged on */
839 err = -ENETUNREACH;
840 break;
841 case 0x0d: /* Max connections for this guest exceeded */
842 case 0x0e: /* Max connections for target guest exceeded */
843 err = -EAGAIN;
844 break;
845 case 0x0f: /* Missing IUCV authorization */
846 err = -EACCES;
847 break;
848 default:
849 err = -ECONNREFUSED;
850 break;
851 }
Ursula Braun3881ac42011-08-08 01:33:54 +0000852 }
853done:
854 return err;
855}
856
857/* Connect an unconnected socket */
858static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
859 int alen, int flags)
860{
861 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
862 struct sock *sk = sock->sk;
863 struct iucv_sock *iucv = iucv_sk(sk);
864 int err;
865
866 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
867 return -EINVAL;
868
869 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
870 return -EBADFD;
871
872 if (sk->sk_state == IUCV_OPEN &&
873 iucv->transport == AF_IUCV_TRANS_HIPER)
874 return -EBADFD; /* explicit bind required */
875
876 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
877 return -EINVAL;
878
879 if (sk->sk_state == IUCV_OPEN) {
880 err = iucv_sock_autobind(sk);
881 if (unlikely(err))
882 return err;
Jennifer Hunteac37312007-02-08 13:51:54 -0800883 }
884
Ursula Braun3881ac42011-08-08 01:33:54 +0000885 lock_sock(sk);
886
887 /* Set the destination information */
888 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
889 memcpy(iucv->dst_name, sa->siucv_name, 8);
890
891 if (iucv->transport == AF_IUCV_TRANS_HIPER)
Ursula Braun9fbd87d2012-03-07 02:06:23 +0000892 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
Ursula Braun3881ac42011-08-08 01:33:54 +0000893 else
894 err = afiucv_path_connect(sock, addr);
895 if (err)
896 goto done;
897
898 if (sk->sk_state != IUCV_CONNECTED)
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +0000899 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
900 IUCV_DISCONN),
901 sock_sndtimeo(sk, flags & O_NONBLOCK));
Jennifer Hunteac37312007-02-08 13:51:54 -0800902
Ursula Braun3881ac42011-08-08 01:33:54 +0000903 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +0000904 err = -ECONNREFUSED;
Ursula Braun18becbc2009-01-05 18:07:46 -0800905
Ursula Braun7d316b92012-02-08 00:19:45 +0000906 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
907 iucv_sever_path(sk, 0);
Ursula Braun18becbc2009-01-05 18:07:46 -0800908
Jennifer Hunteac37312007-02-08 13:51:54 -0800909done:
910 release_sock(sk);
911 return err;
912}
913
914/* Move a socket into listening state. */
915static int iucv_sock_listen(struct socket *sock, int backlog)
916{
917 struct sock *sk = sock->sk;
918 int err;
919
920 lock_sock(sk);
921
922 err = -EINVAL;
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +0000923 if (sk->sk_state != IUCV_BOUND)
924 goto done;
925
926 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
Jennifer Hunteac37312007-02-08 13:51:54 -0800927 goto done;
928
929 sk->sk_max_ack_backlog = backlog;
930 sk->sk_ack_backlog = 0;
931 sk->sk_state = IUCV_LISTEN;
932 err = 0;
933
934done:
935 release_sock(sk);
936 return err;
937}
938
939/* Accept a pending connection */
940static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
941 int flags)
942{
943 DECLARE_WAITQUEUE(wait, current);
944 struct sock *sk = sock->sk, *nsk;
945 long timeo;
946 int err = 0;
947
Jennifer Hunt561e0362007-05-04 12:22:07 -0700948 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
Jennifer Hunteac37312007-02-08 13:51:54 -0800949
950 if (sk->sk_state != IUCV_LISTEN) {
951 err = -EBADFD;
952 goto done;
953 }
954
955 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
956
957 /* Wait for an incoming connection */
Eric Dumazetaa395142010-04-20 13:03:51 +0000958 add_wait_queue_exclusive(sk_sleep(sk), &wait);
Heiko Carstensda99f052007-05-04 12:23:27 -0700959 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
Jennifer Hunteac37312007-02-08 13:51:54 -0800960 set_current_state(TASK_INTERRUPTIBLE);
961 if (!timeo) {
962 err = -EAGAIN;
963 break;
964 }
965
966 release_sock(sk);
967 timeo = schedule_timeout(timeo);
Jennifer Hunt561e0362007-05-04 12:22:07 -0700968 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
Jennifer Hunteac37312007-02-08 13:51:54 -0800969
970 if (sk->sk_state != IUCV_LISTEN) {
971 err = -EBADFD;
972 break;
973 }
974
975 if (signal_pending(current)) {
976 err = sock_intr_errno(timeo);
977 break;
978 }
979 }
980
981 set_current_state(TASK_RUNNING);
Eric Dumazetaa395142010-04-20 13:03:51 +0000982 remove_wait_queue(sk_sleep(sk), &wait);
Jennifer Hunteac37312007-02-08 13:51:54 -0800983
984 if (err)
985 goto done;
986
987 newsock->state = SS_CONNECTED;
988
989done:
990 release_sock(sk);
991 return err;
992}
993
994static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
995 int *len, int peer)
996{
997 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
998 struct sock *sk = sock->sk;
Ursula Braun493d3972011-08-08 01:33:52 +0000999 struct iucv_sock *iucv = iucv_sk(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -08001000
1001 addr->sa_family = AF_IUCV;
1002 *len = sizeof(struct sockaddr_iucv);
1003
1004 if (peer) {
Ursula Braun493d3972011-08-08 01:33:52 +00001005 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1006 memcpy(siucv->siucv_name, iucv->dst_name, 8);
Jennifer Hunteac37312007-02-08 13:51:54 -08001007 } else {
Ursula Braun493d3972011-08-08 01:33:52 +00001008 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1009 memcpy(siucv->siucv_name, iucv->src_name, 8);
Jennifer Hunteac37312007-02-08 13:51:54 -08001010 }
1011 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1012 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
Ursula Braun493d3972011-08-08 01:33:52 +00001013 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
Jennifer Hunteac37312007-02-08 13:51:54 -08001014
1015 return 0;
1016}
1017
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001018/**
1019 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1020 * @path: IUCV path
1021 * @msg: Pointer to a struct iucv_message
1022 * @skb: The socket data to send, skb->len MUST BE <= 7
1023 *
1024 * Send the socket data in the parameter list in the iucv message
1025 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1026 * list and the socket data len at index 7 (last byte).
1027 * See also iucv_msg_length().
1028 *
1029 * Returns the error code from the iucv_message_send() call.
1030 */
1031static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1032 struct sk_buff *skb)
1033{
1034 u8 prmdata[8];
1035
1036 memcpy(prmdata, (void *) skb->data, skb->len);
1037 prmdata[7] = 0xff - (u8) skb->len;
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001038 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001039 (void *) prmdata, 8);
1040}
1041
Ying Xue1b784142015-03-02 15:37:48 +08001042static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1043 size_t len)
Jennifer Hunteac37312007-02-08 13:51:54 -08001044{
1045 struct sock *sk = sock->sk;
1046 struct iucv_sock *iucv = iucv_sk(sk);
Eugene Crossere5374392016-06-13 18:46:14 +02001047 size_t headroom, linear;
Jennifer Hunteac37312007-02-08 13:51:54 -08001048 struct sk_buff *skb;
Eugene Crosser0506eb02015-12-11 12:27:50 +01001049 struct iucv_message txmsg = {0};
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001050 struct cmsghdr *cmsg;
1051 int cmsg_done;
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001052 long timeo;
Ursula Braun8f7c5022008-12-25 13:39:47 +01001053 char user_id[9];
1054 char appl_id[9];
Jennifer Hunteac37312007-02-08 13:51:54 -08001055 int err;
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001056 int noblock = msg->msg_flags & MSG_DONTWAIT;
Jennifer Hunteac37312007-02-08 13:51:54 -08001057
1058 err = sock_error(sk);
1059 if (err)
1060 return err;
1061
1062 if (msg->msg_flags & MSG_OOB)
1063 return -EOPNOTSUPP;
1064
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001065 /* SOCK_SEQPACKET: we do not support segmented records */
1066 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1067 return -EOPNOTSUPP;
1068
Jennifer Hunteac37312007-02-08 13:51:54 -08001069 lock_sock(sk);
1070
1071 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1072 err = -EPIPE;
1073 goto out;
1074 }
1075
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001076 /* Return if the socket is not in connected state */
1077 if (sk->sk_state != IUCV_CONNECTED) {
1078 err = -ENOTCONN;
1079 goto out;
1080 }
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001081
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001082 /* initialize defaults */
1083 cmsg_done = 0; /* check for duplicate headers */
1084 txmsg.class = 0;
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001085
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001086 /* iterate over control messages */
Gu Zhengf95b4142014-12-11 11:22:04 +08001087 for_each_cmsghdr(cmsg, msg) {
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001088 if (!CMSG_OK(msg, cmsg)) {
1089 err = -EINVAL;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001090 goto out;
Jennifer Hunteac37312007-02-08 13:51:54 -08001091 }
1092
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001093 if (cmsg->cmsg_level != SOL_IUCV)
1094 continue;
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001095
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001096 if (cmsg->cmsg_type & cmsg_done) {
1097 err = -EINVAL;
1098 goto out;
1099 }
1100 cmsg_done |= cmsg->cmsg_type;
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001101
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001102 switch (cmsg->cmsg_type) {
1103 case SCM_IUCV_TRGCLS:
1104 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1105 err = -EINVAL;
1106 goto out;
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001107 }
1108
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001109 /* set iucv message target class */
1110 memcpy(&txmsg.class,
1111 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1112
1113 break;
1114
1115 default:
1116 err = -EINVAL;
1117 goto out;
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001118 }
1119 }
1120
1121 /* allocate one skb for each iucv message:
1122 * this is fine for SOCK_SEQPACKET (unless we want to support
1123 * segmented records using the MSG_EOR flag), but
1124 * for SOCK_STREAM we might want to improve it in future */
Eugene Crossere5374392016-06-13 18:46:14 +02001125 headroom = (iucv->transport == AF_IUCV_TRANS_HIPER)
1126 ? sizeof(struct af_iucv_trans_hdr) + ETH_HLEN : 0;
1127 if (headroom + len < PAGE_SIZE) {
1128 linear = len;
1129 } else {
1130 /* In nonlinear "classic" iucv skb,
1131 * reserve space for iucv_array
1132 */
1133 if (iucv->transport != AF_IUCV_TRANS_HIPER)
1134 headroom += sizeof(struct iucv_array) *
1135 (MAX_SKB_FRAGS + 1);
1136 linear = PAGE_SIZE - headroom;
1137 }
1138 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1139 noblock, &err, 0);
Eugene Crossered4ac422015-03-30 15:40:42 +02001140 if (!skb)
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001141 goto out;
Eugene Crossere5374392016-06-13 18:46:14 +02001142 if (headroom)
1143 skb_reserve(skb, headroom);
1144 skb_put(skb, linear);
1145 skb->len = len;
1146 skb->data_len = len - linear;
1147 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1148 if (err)
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001149 goto fail;
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001150
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001151 /* wait if outstanding messages for iucv path has reached */
1152 timeo = sock_sndtimeo(sk, noblock);
1153 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1154 if (err)
1155 goto fail;
1156
1157 /* return -ECONNRESET if the socket is no longer connected */
1158 if (sk->sk_state != IUCV_CONNECTED) {
1159 err = -ECONNRESET;
1160 goto fail;
1161 }
1162
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001163 /* increment and save iucv message tag for msg_completion cbk */
1164 txmsg.tag = iucv->send_tag++;
Ursula Braunf9c41a62013-04-07 22:19:26 +00001165 IUCV_SKB_CB(skb)->tag = txmsg.tag;
Ursula Braun800c5eb2012-02-08 00:19:47 +00001166
Ursula Braun3881ac42011-08-08 01:33:54 +00001167 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1168 atomic_inc(&iucv->msg_sent);
1169 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1170 if (err) {
1171 atomic_dec(&iucv->msg_sent);
1172 goto fail;
1173 }
Eugene Crossere5374392016-06-13 18:46:14 +02001174 } else { /* Classic VM IUCV transport */
1175 skb_queue_tail(&iucv->send_skb_q, skb);
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001176
Eugene Crossere5374392016-06-13 18:46:14 +02001177 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1178 skb->len <= 7) {
1179 err = iucv_send_iprm(iucv->path, &txmsg, skb);
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001180
Eugene Crossere5374392016-06-13 18:46:14 +02001181 /* on success: there is no message_complete callback */
1182 /* for an IPRMDATA msg; remove skb from send queue */
1183 if (err == 0) {
1184 skb_unlink(skb, &iucv->send_skb_q);
1185 kfree_skb(skb);
1186 }
1187
1188 /* this error should never happen since the */
1189 /* IUCV_IPRMDATA path flag is set... sever path */
1190 if (err == 0x15) {
1191 pr_iucv->path_sever(iucv->path, NULL);
1192 skb_unlink(skb, &iucv->send_skb_q);
1193 err = -EPIPE;
1194 goto fail;
1195 }
1196 } else if (skb_is_nonlinear(skb)) {
1197 struct iucv_array *iba = (struct iucv_array *)skb->head;
1198 int i;
1199
1200 /* skip iucv_array lying in the headroom */
1201 iba[0].address = (u32)(addr_t)skb->data;
1202 iba[0].length = (u32)skb_headlen(skb);
1203 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1204 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1205
1206 iba[i + 1].address =
1207 (u32)(addr_t)skb_frag_address(frag);
1208 iba[i + 1].length = (u32)skb_frag_size(frag);
1209 }
1210 err = pr_iucv->message_send(iucv->path, &txmsg,
1211 IUCV_IPBUFLST, 0,
1212 (void *)iba, skb->len);
1213 } else { /* non-IPRM Linear skb */
1214 err = pr_iucv->message_send(iucv->path, &txmsg,
1215 0, 0, (void *)skb->data, skb->len);
Hendrik Bruecknerbb664f42009-06-17 21:54:47 +00001216 }
Eugene Crossere5374392016-06-13 18:46:14 +02001217 if (err) {
1218 if (err == 3) {
1219 user_id[8] = 0;
1220 memcpy(user_id, iucv->dst_user_id, 8);
1221 appl_id[8] = 0;
1222 memcpy(appl_id, iucv->dst_name, 8);
1223 pr_err(
1224 "Application %s on z/VM guest %s exceeds message limit\n",
1225 appl_id, user_id);
1226 err = -EAGAIN;
1227 } else {
1228 err = -EPIPE;
1229 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001230 skb_unlink(skb, &iucv->send_skb_q);
Jennifer Hunteac37312007-02-08 13:51:54 -08001231 goto fail;
1232 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001233 }
1234
1235 release_sock(sk);
1236 return len;
1237
1238fail:
1239 kfree_skb(skb);
1240out:
1241 release_sock(sk);
1242 return err;
1243}
1244
Eugene Crossera006353a92016-06-13 18:46:16 +02001245static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1246{
1247 size_t headroom, linear;
1248 struct sk_buff *skb;
1249 int err;
1250
1251 if (len < PAGE_SIZE) {
1252 headroom = 0;
1253 linear = len;
1254 } else {
1255 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1256 linear = PAGE_SIZE - headroom;
1257 }
1258 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1259 0, &err, GFP_ATOMIC | GFP_DMA);
1260 WARN_ONCE(!skb,
1261 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1262 len, err);
1263 if (skb) {
1264 if (headroom)
1265 skb_reserve(skb, headroom);
1266 skb_put(skb, linear);
1267 skb->len = len;
1268 skb->data_len = len - linear;
1269 }
1270 return skb;
1271}
1272
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001273/* iucv_process_message() - Receive a single outstanding IUCV message
1274 *
1275 * Locking: must be called with message_q.lock held
1276 */
Ursula Braunf0703c82007-10-08 02:03:31 -07001277static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1278 struct iucv_path *path,
1279 struct iucv_message *msg)
1280{
1281 int rc;
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001282 unsigned int len;
Ursula Braunf0703c82007-10-08 02:03:31 -07001283
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001284 len = iucv_msg_length(msg);
1285
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001286 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1287 /* Note: the first 4 bytes are reserved for msg tag */
Ursula Braunf9c41a62013-04-07 22:19:26 +00001288 IUCV_SKB_CB(skb)->class = msg->class;
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001289
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001290 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1291 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1292 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1293 skb->data = NULL;
1294 skb->len = 0;
1295 }
Ursula Braunf0703c82007-10-08 02:03:31 -07001296 } else {
Eugene Crossera006353a92016-06-13 18:46:16 +02001297 if (skb_is_nonlinear(skb)) {
1298 struct iucv_array *iba = (struct iucv_array *)skb->head;
1299 int i;
1300
1301 iba[0].address = (u32)(addr_t)skb->data;
1302 iba[0].length = (u32)skb_headlen(skb);
1303 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1304 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1305
1306 iba[i + 1].address =
1307 (u32)(addr_t)skb_frag_address(frag);
1308 iba[i + 1].length = (u32)skb_frag_size(frag);
1309 }
1310 rc = pr_iucv->message_receive(path, msg,
1311 IUCV_IPBUFLST,
1312 (void *)iba, len, NULL);
1313 } else {
1314 rc = pr_iucv->message_receive(path, msg,
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001315 msg->flags & IUCV_IPRMDATA,
1316 skb->data, len, NULL);
Eugene Crossera006353a92016-06-13 18:46:16 +02001317 }
Ursula Braunf0703c82007-10-08 02:03:31 -07001318 if (rc) {
1319 kfree_skb(skb);
1320 return;
1321 }
Eugene Crossera006353a92016-06-13 18:46:16 +02001322 WARN_ON_ONCE(skb->len != len);
Ursula Braunf0703c82007-10-08 02:03:31 -07001323 }
1324
Ursula Braunf9c41a62013-04-07 22:19:26 +00001325 IUCV_SKB_CB(skb)->offset = 0;
Ursula Braun8c68b1a2016-10-07 15:51:48 +02001326 if (sk_filter(sk, skb)) {
1327 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1328 kfree_skb(skb);
1329 return;
1330 }
1331 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1332 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
Ursula Braunf0703c82007-10-08 02:03:31 -07001333}
1334
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001335/* iucv_process_message_q() - Process outstanding IUCV messages
1336 *
1337 * Locking: must be called with message_q.lock held
1338 */
Ursula Braunf0703c82007-10-08 02:03:31 -07001339static void iucv_process_message_q(struct sock *sk)
1340{
1341 struct iucv_sock *iucv = iucv_sk(sk);
1342 struct sk_buff *skb;
1343 struct sock_msg_q *p, *n;
1344
1345 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
Eugene Crossera006353a92016-06-13 18:46:16 +02001346 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
Ursula Braunf0703c82007-10-08 02:03:31 -07001347 if (!skb)
1348 break;
1349 iucv_process_message(sk, skb, p->path, &p->msg);
1350 list_del(&p->list);
1351 kfree(p);
1352 if (!skb_queue_empty(&iucv->backlog_skb_q))
1353 break;
1354 }
1355}
1356
Ying Xue1b784142015-03-02 15:37:48 +08001357static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1358 size_t len, int flags)
Jennifer Hunteac37312007-02-08 13:51:54 -08001359{
1360 int noblock = flags & MSG_DONTWAIT;
1361 struct sock *sk = sock->sk;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001362 struct iucv_sock *iucv = iucv_sk(sk);
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001363 unsigned int copied, rlen;
Ursula Braun9fbd87d2012-03-07 02:06:23 +00001364 struct sk_buff *skb, *rskb, *cskb;
Jennifer Hunteac37312007-02-08 13:51:54 -08001365 int err = 0;
Ursula Braunf9c41a62013-04-07 22:19:26 +00001366 u32 offset;
Jennifer Hunteac37312007-02-08 13:51:54 -08001367
Ursula Braunaac63992011-12-19 22:56:31 +00001368 if ((sk->sk_state == IUCV_DISCONN) &&
Ursula Braunf0703c82007-10-08 02:03:31 -07001369 skb_queue_empty(&iucv->backlog_skb_q) &&
1370 skb_queue_empty(&sk->sk_receive_queue) &&
1371 list_empty(&iucv->message_q.list))
Jennifer Hunt561e0362007-05-04 12:22:07 -07001372 return 0;
1373
Jennifer Hunteac37312007-02-08 13:51:54 -08001374 if (flags & (MSG_OOB))
1375 return -EOPNOTSUPP;
1376
Hendrik Brueckner60d37052009-04-21 06:04:21 +00001377 /* receive/dequeue next skb:
1378 * the function understands MSG_PEEK and, thus, does not dequeue skb */
Jennifer Hunteac37312007-02-08 13:51:54 -08001379 skb = skb_recv_datagram(sk, flags, noblock, &err);
1380 if (!skb) {
1381 if (sk->sk_shutdown & RCV_SHUTDOWN)
1382 return 0;
1383 return err;
1384 }
1385
Ursula Braunf9c41a62013-04-07 22:19:26 +00001386 offset = IUCV_SKB_CB(skb)->offset;
1387 rlen = skb->len - offset; /* real length of skb */
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001388 copied = min_t(unsigned int, rlen, len);
Ursula Braun82492a32012-03-07 02:06:24 +00001389 if (!rlen)
1390 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
Jennifer Hunteac37312007-02-08 13:51:54 -08001391
Jennifer Hunt561e0362007-05-04 12:22:07 -07001392 cskb = skb;
David S. Miller51f3d022014-11-05 16:46:40 -05001393 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
Hendrik Brueckner802788b2009-04-21 23:26:26 +00001394 if (!(flags & MSG_PEEK))
1395 skb_queue_head(&sk->sk_receive_queue, skb);
1396 return -EFAULT;
Jennifer Hunteac37312007-02-08 13:51:54 -08001397 }
1398
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001399 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1400 if (sk->sk_type == SOCK_SEQPACKET) {
1401 if (copied < rlen)
1402 msg->msg_flags |= MSG_TRUNC;
1403 /* each iucv message contains a complete record */
1404 msg->msg_flags |= MSG_EOR;
1405 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001406
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001407 /* create control message to store iucv msg target class:
1408 * get the trgcls from the control buffer of the skb due to
1409 * fragmentation of original iucv message. */
1410 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
Ursula Braunf9c41a62013-04-07 22:19:26 +00001411 sizeof(IUCV_SKB_CB(skb)->class),
1412 (void *)&IUCV_SKB_CB(skb)->class);
Hendrik Brueckner44b1e6b2009-04-21 23:26:24 +00001413 if (err) {
1414 if (!(flags & MSG_PEEK))
1415 skb_queue_head(&sk->sk_receive_queue, skb);
1416 return err;
1417 }
1418
Jennifer Hunteac37312007-02-08 13:51:54 -08001419 /* Mark read part of skb as used */
1420 if (!(flags & MSG_PEEK)) {
Jennifer Hunteac37312007-02-08 13:51:54 -08001421
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001422 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1423 if (sk->sk_type == SOCK_STREAM) {
Ursula Braunf9c41a62013-04-07 22:19:26 +00001424 if (copied < rlen) {
1425 IUCV_SKB_CB(skb)->offset = offset + copied;
Ursula Braun2f139a52014-03-19 07:57:59 +01001426 skb_queue_head(&sk->sk_receive_queue, skb);
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001427 goto done;
1428 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001429 }
1430
1431 kfree_skb(skb);
Ursula Braun800c5eb2012-02-08 00:19:47 +00001432 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1433 atomic_inc(&iucv->msg_recv);
1434 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1435 WARN_ON(1);
1436 iucv_sock_close(sk);
1437 return -EFAULT;
1438 }
1439 }
Jennifer Hunt561e0362007-05-04 12:22:07 -07001440
1441 /* Queue backlog skbs */
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001442 spin_lock_bh(&iucv->message_q.lock);
Ursula Braunf0703c82007-10-08 02:03:31 -07001443 rskb = skb_dequeue(&iucv->backlog_skb_q);
Heiko Carstensda99f052007-05-04 12:23:27 -07001444 while (rskb) {
Ursula Braunf9c41a62013-04-07 22:19:26 +00001445 IUCV_SKB_CB(rskb)->offset = 0;
Ursula Braun8c68b1a2016-10-07 15:51:48 +02001446 if (__sock_queue_rcv_skb(sk, rskb)) {
1447 /* handle rcv queue full */
Ursula Braunf0703c82007-10-08 02:03:31 -07001448 skb_queue_head(&iucv->backlog_skb_q,
Jennifer Hunt561e0362007-05-04 12:22:07 -07001449 rskb);
1450 break;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001451 }
Ursula Braun8c68b1a2016-10-07 15:51:48 +02001452 rskb = skb_dequeue(&iucv->backlog_skb_q);
Jennifer Hunt561e0362007-05-04 12:22:07 -07001453 }
Ursula Braunf0703c82007-10-08 02:03:31 -07001454 if (skb_queue_empty(&iucv->backlog_skb_q)) {
Ursula Braunf0703c82007-10-08 02:03:31 -07001455 if (!list_empty(&iucv->message_q.list))
1456 iucv_process_message_q(sk);
Ursula Braun3881ac42011-08-08 01:33:54 +00001457 if (atomic_read(&iucv->msg_recv) >=
1458 iucv->msglimit / 2) {
Ursula Braun9fbd87d2012-03-07 02:06:23 +00001459 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
Ursula Braun3881ac42011-08-08 01:33:54 +00001460 if (err) {
1461 sk->sk_state = IUCV_DISCONN;
1462 sk->sk_state_change(sk);
1463 }
1464 }
Ursula Braunf0703c82007-10-08 02:03:31 -07001465 }
Hendrik Bruecknerbf95d202009-09-16 04:37:28 +00001466 spin_unlock_bh(&iucv->message_q.lock);
Hendrik Brueckner60d37052009-04-21 06:04:21 +00001467 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001468
1469done:
Hendrik Brueckneraa8e71f2009-04-21 23:26:25 +00001470 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1471 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1472 copied = rlen;
1473
1474 return copied;
Jennifer Hunteac37312007-02-08 13:51:54 -08001475}
1476
1477static inline unsigned int iucv_accept_poll(struct sock *parent)
1478{
1479 struct iucv_sock *isk, *n;
1480 struct sock *sk;
1481
Heiko Carstensda99f052007-05-04 12:23:27 -07001482 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
Jennifer Hunteac37312007-02-08 13:51:54 -08001483 sk = (struct sock *) isk;
1484
1485 if (sk->sk_state == IUCV_CONNECTED)
1486 return POLLIN | POLLRDNORM;
1487 }
1488
1489 return 0;
1490}
1491
1492unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1493 poll_table *wait)
1494{
1495 struct sock *sk = sock->sk;
1496 unsigned int mask = 0;
1497
Eric Dumazetaa395142010-04-20 13:03:51 +00001498 sock_poll_wait(file, sk_sleep(sk), wait);
Jennifer Hunteac37312007-02-08 13:51:54 -08001499
1500 if (sk->sk_state == IUCV_LISTEN)
1501 return iucv_accept_poll(sk);
1502
1503 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
Keller, Jacob E7d4c04f2013-03-28 11:19:25 +00001504 mask |= POLLERR |
Jacob Keller8facd5f2013-04-02 13:55:40 -07001505 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
Jennifer Hunteac37312007-02-08 13:51:54 -08001506
1507 if (sk->sk_shutdown & RCV_SHUTDOWN)
1508 mask |= POLLRDHUP;
1509
1510 if (sk->sk_shutdown == SHUTDOWN_MASK)
1511 mask |= POLLHUP;
1512
1513 if (!skb_queue_empty(&sk->sk_receive_queue) ||
Heiko Carstensda99f052007-05-04 12:23:27 -07001514 (sk->sk_shutdown & RCV_SHUTDOWN))
Jennifer Hunteac37312007-02-08 13:51:54 -08001515 mask |= POLLIN | POLLRDNORM;
1516
1517 if (sk->sk_state == IUCV_CLOSED)
1518 mask |= POLLHUP;
1519
Ursula Braunaac63992011-12-19 22:56:31 +00001520 if (sk->sk_state == IUCV_DISCONN)
Jennifer Hunt561e0362007-05-04 12:22:07 -07001521 mask |= POLLIN;
1522
Ursula Braun7f1b0ea2012-02-08 00:19:46 +00001523 if (sock_writeable(sk) && iucv_below_msglim(sk))
Jennifer Hunteac37312007-02-08 13:51:54 -08001524 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1525 else
Eric Dumazet9cd3e072015-11-29 20:03:10 -08001526 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
Jennifer Hunteac37312007-02-08 13:51:54 -08001527
1528 return mask;
1529}
1530
1531static int iucv_sock_shutdown(struct socket *sock, int how)
1532{
1533 struct sock *sk = sock->sk;
1534 struct iucv_sock *iucv = iucv_sk(sk);
1535 struct iucv_message txmsg;
1536 int err = 0;
Jennifer Hunteac37312007-02-08 13:51:54 -08001537
1538 how++;
1539
1540 if ((how & ~SHUTDOWN_MASK) || !how)
1541 return -EINVAL;
1542
1543 lock_sock(sk);
Heiko Carstensda99f052007-05-04 12:23:27 -07001544 switch (sk->sk_state) {
Ursula Braun82492a32012-03-07 02:06:24 +00001545 case IUCV_LISTEN:
Hendrik Bruecknere14ad5f2009-04-21 06:04:23 +00001546 case IUCV_DISCONN:
1547 case IUCV_CLOSING:
Jennifer Hunteac37312007-02-08 13:51:54 -08001548 case IUCV_CLOSED:
1549 err = -ENOTCONN;
1550 goto fail;
Jennifer Hunteac37312007-02-08 13:51:54 -08001551 default:
Jennifer Hunteac37312007-02-08 13:51:54 -08001552 break;
1553 }
1554
1555 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
Ursula Braun82492a32012-03-07 02:06:24 +00001556 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1557 txmsg.class = 0;
1558 txmsg.tag = 0;
1559 err = pr_iucv->message_send(iucv->path, &txmsg,
1560 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1561 if (err) {
1562 switch (err) {
1563 case 1:
1564 err = -ENOTCONN;
1565 break;
1566 case 2:
1567 err = -ECONNRESET;
1568 break;
1569 default:
1570 err = -ENOTCONN;
1571 break;
1572 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001573 }
Ursula Braun82492a32012-03-07 02:06:24 +00001574 } else
1575 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
Jennifer Hunteac37312007-02-08 13:51:54 -08001576 }
1577
Ursula Braun82492a32012-03-07 02:06:24 +00001578 sk->sk_shutdown |= how;
Jennifer Hunteac37312007-02-08 13:51:54 -08001579 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
Ursula Braun1042cab2014-07-21 12:54:44 +02001580 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1581 iucv->path) {
Ursula Braun82492a32012-03-07 02:06:24 +00001582 err = pr_iucv->path_quiesce(iucv->path, NULL);
1583 if (err)
1584 err = -ENOTCONN;
1585/* skb_queue_purge(&sk->sk_receive_queue); */
1586 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001587 skb_queue_purge(&sk->sk_receive_queue);
1588 }
1589
1590 /* Wake up anyone sleeping in poll */
1591 sk->sk_state_change(sk);
1592
1593fail:
1594 release_sock(sk);
1595 return err;
1596}
1597
1598static int iucv_sock_release(struct socket *sock)
1599{
1600 struct sock *sk = sock->sk;
1601 int err = 0;
1602
1603 if (!sk)
1604 return 0;
1605
1606 iucv_sock_close(sk);
1607
Jennifer Hunteac37312007-02-08 13:51:54 -08001608 sock_orphan(sk);
1609 iucv_sock_kill(sk);
1610 return err;
1611}
1612
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001613/* getsockopt and setsockopt */
1614static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001615 char __user *optval, unsigned int optlen)
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001616{
1617 struct sock *sk = sock->sk;
1618 struct iucv_sock *iucv = iucv_sk(sk);
1619 int val;
1620 int rc;
1621
1622 if (level != SOL_IUCV)
1623 return -ENOPROTOOPT;
1624
1625 if (optlen < sizeof(int))
1626 return -EINVAL;
1627
1628 if (get_user(val, (int __user *) optval))
1629 return -EFAULT;
1630
1631 rc = 0;
1632
1633 lock_sock(sk);
1634 switch (optname) {
1635 case SO_IPRMDATA_MSG:
1636 if (val)
1637 iucv->flags |= IUCV_IPRMDATA;
1638 else
1639 iucv->flags &= ~IUCV_IPRMDATA;
1640 break;
Hendrik Brueckner09488e22009-04-21 23:26:27 +00001641 case SO_MSGLIMIT:
1642 switch (sk->sk_state) {
1643 case IUCV_OPEN:
1644 case IUCV_BOUND:
1645 if (val < 1 || val > (u16)(~0))
1646 rc = -EINVAL;
1647 else
1648 iucv->msglimit = val;
1649 break;
1650 default:
1651 rc = -EINVAL;
1652 break;
1653 }
1654 break;
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001655 default:
1656 rc = -ENOPROTOOPT;
1657 break;
1658 }
1659 release_sock(sk);
1660
1661 return rc;
1662}
1663
1664static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1665 char __user *optval, int __user *optlen)
1666{
1667 struct sock *sk = sock->sk;
1668 struct iucv_sock *iucv = iucv_sk(sk);
Ursula Braun51363b82012-02-08 00:19:48 +00001669 unsigned int val;
1670 int len;
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001671
1672 if (level != SOL_IUCV)
1673 return -ENOPROTOOPT;
1674
1675 if (get_user(len, optlen))
1676 return -EFAULT;
1677
1678 if (len < 0)
1679 return -EINVAL;
1680
1681 len = min_t(unsigned int, len, sizeof(int));
1682
1683 switch (optname) {
1684 case SO_IPRMDATA_MSG:
1685 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1686 break;
Hendrik Brueckner09488e22009-04-21 23:26:27 +00001687 case SO_MSGLIMIT:
1688 lock_sock(sk);
1689 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1690 : iucv->msglimit; /* default */
1691 release_sock(sk);
1692 break;
Ursula Braun51363b82012-02-08 00:19:48 +00001693 case SO_MSGSIZE:
1694 if (sk->sk_state == IUCV_OPEN)
1695 return -EBADFD;
1696 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1697 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1698 0x7fffffff;
1699 break;
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00001700 default:
1701 return -ENOPROTOOPT;
1702 }
1703
1704 if (put_user(len, optlen))
1705 return -EFAULT;
1706 if (copy_to_user(optval, &val, len))
1707 return -EFAULT;
1708
1709 return 0;
1710}
1711
1712
Jennifer Hunteac37312007-02-08 13:51:54 -08001713/* Callback wrappers - called from iucv base support */
1714static int iucv_callback_connreq(struct iucv_path *path,
1715 u8 ipvmid[8], u8 ipuser[16])
1716{
1717 unsigned char user_data[16];
1718 unsigned char nuser_data[16];
1719 unsigned char src_name[8];
Jennifer Hunteac37312007-02-08 13:51:54 -08001720 struct sock *sk, *nsk;
1721 struct iucv_sock *iucv, *niucv;
1722 int err;
1723
1724 memcpy(src_name, ipuser, 8);
1725 EBCASC(src_name, 8);
1726 /* Find out if this path belongs to af_iucv. */
1727 read_lock(&iucv_sk_list.lock);
1728 iucv = NULL;
Ursula Braunfebca282007-07-14 19:04:25 -07001729 sk = NULL;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001730 sk_for_each(sk, &iucv_sk_list.head)
Jennifer Hunteac37312007-02-08 13:51:54 -08001731 if (sk->sk_state == IUCV_LISTEN &&
1732 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1733 /*
1734 * Found a listening socket with
1735 * src_name == ipuser[0-7].
1736 */
1737 iucv = iucv_sk(sk);
1738 break;
1739 }
1740 read_unlock(&iucv_sk_list.lock);
1741 if (!iucv)
1742 /* No socket found, not one of our paths. */
1743 return -EINVAL;
1744
1745 bh_lock_sock(sk);
1746
1747 /* Check if parent socket is listening */
1748 low_nmcpy(user_data, iucv->src_name);
1749 high_nmcpy(user_data, iucv->dst_name);
1750 ASCEBC(user_data, sizeof(user_data));
1751 if (sk->sk_state != IUCV_LISTEN) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001752 err = pr_iucv->path_sever(path, user_data);
Hendrik Brueckner65dbd7c2009-01-05 18:08:23 -08001753 iucv_path_free(path);
Jennifer Hunteac37312007-02-08 13:51:54 -08001754 goto fail;
1755 }
1756
1757 /* Check for backlog size */
1758 if (sk_acceptq_is_full(sk)) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001759 err = pr_iucv->path_sever(path, user_data);
Hendrik Brueckner65dbd7c2009-01-05 18:08:23 -08001760 iucv_path_free(path);
Jennifer Hunteac37312007-02-08 13:51:54 -08001761 goto fail;
1762 }
1763
1764 /* Create the new socket */
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001765 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
Heiko Carstensda99f052007-05-04 12:23:27 -07001766 if (!nsk) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001767 err = pr_iucv->path_sever(path, user_data);
Hendrik Brueckner65dbd7c2009-01-05 18:08:23 -08001768 iucv_path_free(path);
Jennifer Hunteac37312007-02-08 13:51:54 -08001769 goto fail;
1770 }
1771
1772 niucv = iucv_sk(nsk);
1773 iucv_sock_init(nsk, sk);
1774
1775 /* Set the new iucv_sock */
1776 memcpy(niucv->dst_name, ipuser + 8, 8);
1777 EBCASC(niucv->dst_name, 8);
1778 memcpy(niucv->dst_user_id, ipvmid, 8);
1779 memcpy(niucv->src_name, iucv->src_name, 8);
1780 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1781 niucv->path = path;
1782
1783 /* Call iucv_accept */
1784 high_nmcpy(nuser_data, ipuser + 8);
1785 memcpy(nuser_data + 8, niucv->src_name, 8);
1786 ASCEBC(nuser_data + 8, 8);
1787
Hendrik Brueckner09488e22009-04-21 23:26:27 +00001788 /* set message limit for path based on msglimit of accepting socket */
1789 niucv->msglimit = iucv->msglimit;
1790 path->msglim = iucv->msglimit;
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001791 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
Heiko Carstensda99f052007-05-04 12:23:27 -07001792 if (err) {
Ursula Braun7d316b92012-02-08 00:19:45 +00001793 iucv_sever_path(nsk, 1);
Hendrik Brueckner65dbd7c2009-01-05 18:08:23 -08001794 iucv_sock_kill(nsk);
Jennifer Hunteac37312007-02-08 13:51:54 -08001795 goto fail;
1796 }
1797
1798 iucv_accept_enqueue(sk, nsk);
1799
1800 /* Wake up accept */
1801 nsk->sk_state = IUCV_CONNECTED;
David S. Miller676d2362014-04-11 16:15:36 -04001802 sk->sk_data_ready(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -08001803 err = 0;
1804fail:
1805 bh_unlock_sock(sk);
1806 return 0;
1807}
1808
1809static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1810{
1811 struct sock *sk = path->private;
1812
1813 sk->sk_state = IUCV_CONNECTED;
1814 sk->sk_state_change(sk);
1815}
1816
1817static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1818{
1819 struct sock *sk = path->private;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001820 struct iucv_sock *iucv = iucv_sk(sk);
Ursula Braunf0703c82007-10-08 02:03:31 -07001821 struct sk_buff *skb;
1822 struct sock_msg_q *save_msg;
1823 int len;
Jennifer Hunt561e0362007-05-04 12:22:07 -07001824
Hendrik Bruecknerfe86e542009-04-21 06:04:22 +00001825 if (sk->sk_shutdown & RCV_SHUTDOWN) {
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00001826 pr_iucv->message_reject(path, msg);
Jennifer Hunteac37312007-02-08 13:51:54 -08001827 return;
Hendrik Bruecknerfe86e542009-04-21 06:04:22 +00001828 }
Jennifer Hunteac37312007-02-08 13:51:54 -08001829
Hendrik Brueckner3fa6b5a2009-04-21 06:04:24 +00001830 spin_lock(&iucv->message_q.lock);
Jennifer Hunteac37312007-02-08 13:51:54 -08001831
Ursula Braunf0703c82007-10-08 02:03:31 -07001832 if (!list_empty(&iucv->message_q.list) ||
1833 !skb_queue_empty(&iucv->backlog_skb_q))
1834 goto save_message;
1835
1836 len = atomic_read(&sk->sk_rmem_alloc);
Eric Dumazet87fb4b72011-10-13 07:28:54 +00001837 len += SKB_TRUESIZE(iucv_msg_length(msg));
Ursula Braunf0703c82007-10-08 02:03:31 -07001838 if (len > sk->sk_rcvbuf)
1839 goto save_message;
1840
Eugene Crossera006353a92016-06-13 18:46:16 +02001841 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
Ursula Braunf0703c82007-10-08 02:03:31 -07001842 if (!skb)
1843 goto save_message;
Jennifer Hunteac37312007-02-08 13:51:54 -08001844
Ursula Braunf0703c82007-10-08 02:03:31 -07001845 iucv_process_message(sk, skb, path, msg);
Hendrik Brueckner3fa6b5a2009-04-21 06:04:24 +00001846 goto out_unlock;
Jennifer Hunteac37312007-02-08 13:51:54 -08001847
Ursula Braunf0703c82007-10-08 02:03:31 -07001848save_message:
1849 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
Ursula Braund4444722008-02-07 18:07:19 -08001850 if (!save_msg)
Julia Lawalla56635a2010-05-26 05:56:48 +00001851 goto out_unlock;
Ursula Braunf0703c82007-10-08 02:03:31 -07001852 save_msg->path = path;
1853 save_msg->msg = *msg;
1854
Ursula Braunf0703c82007-10-08 02:03:31 -07001855 list_add_tail(&save_msg->list, &iucv->message_q.list);
Hendrik Brueckner3fa6b5a2009-04-21 06:04:24 +00001856
1857out_unlock:
Ursula Braunf0703c82007-10-08 02:03:31 -07001858 spin_unlock(&iucv->message_q.lock);
Jennifer Hunteac37312007-02-08 13:51:54 -08001859}
1860
1861static void iucv_callback_txdone(struct iucv_path *path,
1862 struct iucv_message *msg)
1863{
1864 struct sock *sk = path->private;
Ursula Braunf2a77992008-02-07 18:07:44 -08001865 struct sk_buff *this = NULL;
Jennifer Hunteac37312007-02-08 13:51:54 -08001866 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1867 struct sk_buff *list_skb = list->next;
1868 unsigned long flags;
1869
Ursula Braun7d316b92012-02-08 00:19:45 +00001870 bh_lock_sock(sk);
Ursula Braunf2a77992008-02-07 18:07:44 -08001871 if (!skb_queue_empty(list)) {
Jennifer Hunt561e0362007-05-04 12:22:07 -07001872 spin_lock_irqsave(&list->lock, flags);
Jennifer Hunteac37312007-02-08 13:51:54 -08001873
Ursula Braunf2a77992008-02-07 18:07:44 -08001874 while (list_skb != (struct sk_buff *)list) {
Ursula Braunf5738e22014-05-13 14:38:02 +02001875 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
Ursula Braunf2a77992008-02-07 18:07:44 -08001876 this = list_skb;
1877 break;
1878 }
Jennifer Hunt561e0362007-05-04 12:22:07 -07001879 list_skb = list_skb->next;
Ursula Braunf2a77992008-02-07 18:07:44 -08001880 }
1881 if (this)
1882 __skb_unlink(this, list);
Jennifer Hunteac37312007-02-08 13:51:54 -08001883
Jennifer Hunt561e0362007-05-04 12:22:07 -07001884 spin_unlock_irqrestore(&list->lock, flags);
Jennifer Hunteac37312007-02-08 13:51:54 -08001885
Hendrik Brueckner0ea920d2009-06-17 21:54:48 +00001886 if (this) {
1887 kfree_skb(this);
1888 /* wake up any process waiting for sending */
1889 iucv_sock_wake_msglim(sk);
1890 }
Jennifer Hunt561e0362007-05-04 12:22:07 -07001891 }
1892
Heiko Carstensda99f052007-05-04 12:23:27 -07001893 if (sk->sk_state == IUCV_CLOSING) {
Jennifer Hunt561e0362007-05-04 12:22:07 -07001894 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1895 sk->sk_state = IUCV_CLOSED;
1896 sk->sk_state_change(sk);
1897 }
1898 }
Ursula Braun7d316b92012-02-08 00:19:45 +00001899 bh_unlock_sock(sk);
Jennifer Hunt561e0362007-05-04 12:22:07 -07001900
Jennifer Hunteac37312007-02-08 13:51:54 -08001901}
1902
1903static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1904{
1905 struct sock *sk = path->private;
1906
Ursula Braun7d316b92012-02-08 00:19:45 +00001907 if (sk->sk_state == IUCV_CLOSED)
1908 return;
1909
1910 bh_lock_sock(sk);
1911 iucv_sever_path(sk, 1);
Ursula Braunaac63992011-12-19 22:56:31 +00001912 sk->sk_state = IUCV_DISCONN;
Jennifer Hunteac37312007-02-08 13:51:54 -08001913
1914 sk->sk_state_change(sk);
Ursula Braun7d316b92012-02-08 00:19:45 +00001915 bh_unlock_sock(sk);
Jennifer Hunteac37312007-02-08 13:51:54 -08001916}
1917
Hendrik Brueckneraf88b522009-04-21 23:26:21 +00001918/* called if the other communication side shuts down its RECV direction;
1919 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1920 */
1921static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1922{
1923 struct sock *sk = path->private;
1924
1925 bh_lock_sock(sk);
1926 if (sk->sk_state != IUCV_CLOSED) {
1927 sk->sk_shutdown |= SEND_SHUTDOWN;
1928 sk->sk_state_change(sk);
1929 }
1930 bh_unlock_sock(sk);
1931}
1932
Ursula Braun3881ac42011-08-08 01:33:54 +00001933/***************** HiperSockets transport callbacks ********************/
1934static void afiucv_swap_src_dest(struct sk_buff *skb)
1935{
1936 struct af_iucv_trans_hdr *trans_hdr =
1937 (struct af_iucv_trans_hdr *)skb->data;
1938 char tmpID[8];
1939 char tmpName[8];
1940
1941 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1942 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1943 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1944 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1945 memcpy(tmpID, trans_hdr->srcUserID, 8);
1946 memcpy(tmpName, trans_hdr->srcAppName, 8);
1947 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1948 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1949 memcpy(trans_hdr->destUserID, tmpID, 8);
1950 memcpy(trans_hdr->destAppName, tmpName, 8);
1951 skb_push(skb, ETH_HLEN);
1952 memset(skb->data, 0, ETH_HLEN);
1953}
1954
1955/**
1956 * afiucv_hs_callback_syn - react on received SYN
1957 **/
1958static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1959{
1960 struct sock *nsk;
1961 struct iucv_sock *iucv, *niucv;
1962 struct af_iucv_trans_hdr *trans_hdr;
1963 int err;
1964
1965 iucv = iucv_sk(sk);
1966 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1967 if (!iucv) {
1968 /* no sock - connection refused */
1969 afiucv_swap_src_dest(skb);
1970 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1971 err = dev_queue_xmit(skb);
1972 goto out;
1973 }
1974
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001975 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
Ursula Braun3881ac42011-08-08 01:33:54 +00001976 bh_lock_sock(sk);
1977 if ((sk->sk_state != IUCV_LISTEN) ||
1978 sk_acceptq_is_full(sk) ||
1979 !nsk) {
1980 /* error on server socket - connection refused */
Ursula Braun3881ac42011-08-08 01:33:54 +00001981 afiucv_swap_src_dest(skb);
1982 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1983 err = dev_queue_xmit(skb);
Ursula Braun4d520f62014-05-28 10:22:29 +02001984 iucv_sock_kill(nsk);
Ursula Braun3881ac42011-08-08 01:33:54 +00001985 bh_unlock_sock(sk);
1986 goto out;
1987 }
1988
1989 niucv = iucv_sk(nsk);
1990 iucv_sock_init(nsk, sk);
1991 niucv->transport = AF_IUCV_TRANS_HIPER;
1992 niucv->msglimit = iucv->msglimit;
1993 if (!trans_hdr->window)
1994 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1995 else
1996 niucv->msglimit_peer = trans_hdr->window;
1997 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1998 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1999 memcpy(niucv->src_name, iucv->src_name, 8);
2000 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2001 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
Ursula Braun800c5eb2012-02-08 00:19:47 +00002002 niucv->hs_dev = iucv->hs_dev;
2003 dev_hold(niucv->hs_dev);
Ursula Braun3881ac42011-08-08 01:33:54 +00002004 afiucv_swap_src_dest(skb);
2005 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2006 trans_hdr->window = niucv->msglimit;
2007 /* if receiver acks the xmit connection is established */
2008 err = dev_queue_xmit(skb);
2009 if (!err) {
2010 iucv_accept_enqueue(sk, nsk);
2011 nsk->sk_state = IUCV_CONNECTED;
David S. Miller676d2362014-04-11 16:15:36 -04002012 sk->sk_data_ready(sk);
Ursula Braun3881ac42011-08-08 01:33:54 +00002013 } else
2014 iucv_sock_kill(nsk);
2015 bh_unlock_sock(sk);
2016
2017out:
2018 return NET_RX_SUCCESS;
2019}
2020
2021/**
2022 * afiucv_hs_callback_synack() - react on received SYN-ACK
2023 **/
2024static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2025{
2026 struct iucv_sock *iucv = iucv_sk(sk);
2027 struct af_iucv_trans_hdr *trans_hdr =
2028 (struct af_iucv_trans_hdr *)skb->data;
2029
2030 if (!iucv)
2031 goto out;
2032 if (sk->sk_state != IUCV_BOUND)
2033 goto out;
2034 bh_lock_sock(sk);
2035 iucv->msglimit_peer = trans_hdr->window;
2036 sk->sk_state = IUCV_CONNECTED;
2037 sk->sk_state_change(sk);
2038 bh_unlock_sock(sk);
2039out:
2040 kfree_skb(skb);
2041 return NET_RX_SUCCESS;
2042}
2043
2044/**
2045 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2046 **/
2047static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2048{
2049 struct iucv_sock *iucv = iucv_sk(sk);
2050
2051 if (!iucv)
2052 goto out;
2053 if (sk->sk_state != IUCV_BOUND)
2054 goto out;
2055 bh_lock_sock(sk);
2056 sk->sk_state = IUCV_DISCONN;
2057 sk->sk_state_change(sk);
2058 bh_unlock_sock(sk);
2059out:
2060 kfree_skb(skb);
2061 return NET_RX_SUCCESS;
2062}
2063
2064/**
2065 * afiucv_hs_callback_fin() - react on received FIN
2066 **/
2067static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2068{
2069 struct iucv_sock *iucv = iucv_sk(sk);
2070
2071 /* other end of connection closed */
Ursula Braun800c5eb2012-02-08 00:19:47 +00002072 if (!iucv)
2073 goto out;
2074 bh_lock_sock(sk);
2075 if (sk->sk_state == IUCV_CONNECTED) {
Ursula Braunaac63992011-12-19 22:56:31 +00002076 sk->sk_state = IUCV_DISCONN;
Ursula Braun3881ac42011-08-08 01:33:54 +00002077 sk->sk_state_change(sk);
Ursula Braun3881ac42011-08-08 01:33:54 +00002078 }
Ursula Braun800c5eb2012-02-08 00:19:47 +00002079 bh_unlock_sock(sk);
2080out:
Ursula Braun3881ac42011-08-08 01:33:54 +00002081 kfree_skb(skb);
2082 return NET_RX_SUCCESS;
2083}
2084
2085/**
2086 * afiucv_hs_callback_win() - react on received WIN
2087 **/
2088static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2089{
2090 struct iucv_sock *iucv = iucv_sk(sk);
2091 struct af_iucv_trans_hdr *trans_hdr =
2092 (struct af_iucv_trans_hdr *)skb->data;
2093
2094 if (!iucv)
2095 return NET_RX_SUCCESS;
2096
2097 if (sk->sk_state != IUCV_CONNECTED)
2098 return NET_RX_SUCCESS;
2099
2100 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2101 iucv_sock_wake_msglim(sk);
2102 return NET_RX_SUCCESS;
2103}
2104
2105/**
2106 * afiucv_hs_callback_rx() - react on received data
2107 **/
2108static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2109{
2110 struct iucv_sock *iucv = iucv_sk(sk);
2111
2112 if (!iucv) {
2113 kfree_skb(skb);
2114 return NET_RX_SUCCESS;
2115 }
2116
2117 if (sk->sk_state != IUCV_CONNECTED) {
2118 kfree_skb(skb);
2119 return NET_RX_SUCCESS;
2120 }
2121
Ursula Braun82492a32012-03-07 02:06:24 +00002122 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2123 kfree_skb(skb);
2124 return NET_RX_SUCCESS;
2125 }
2126
Eugene Crosser979f66b2015-12-11 12:27:51 +01002127 /* write stuff from iucv_msg to skb cb */
Ursula Braun3881ac42011-08-08 01:33:54 +00002128 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2129 skb_reset_transport_header(skb);
2130 skb_reset_network_header(skb);
Ursula Braunf9c41a62013-04-07 22:19:26 +00002131 IUCV_SKB_CB(skb)->offset = 0;
Ursula Braun8c68b1a2016-10-07 15:51:48 +02002132 if (sk_filter(sk, skb)) {
2133 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2134 kfree_skb(skb);
2135 return NET_RX_SUCCESS;
2136 }
2137
Ursula Braun3881ac42011-08-08 01:33:54 +00002138 spin_lock(&iucv->message_q.lock);
2139 if (skb_queue_empty(&iucv->backlog_skb_q)) {
Ursula Braun8c68b1a2016-10-07 15:51:48 +02002140 if (__sock_queue_rcv_skb(sk, skb))
Ursula Braun3881ac42011-08-08 01:33:54 +00002141 /* handle rcv queue full */
2142 skb_queue_tail(&iucv->backlog_skb_q, skb);
Ursula Braun3881ac42011-08-08 01:33:54 +00002143 } else
2144 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2145 spin_unlock(&iucv->message_q.lock);
2146 return NET_RX_SUCCESS;
2147}
2148
2149/**
2150 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2151 * transport
2152 * called from netif RX softirq
2153 **/
2154static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2155 struct packet_type *pt, struct net_device *orig_dev)
2156{
Ursula Braun3881ac42011-08-08 01:33:54 +00002157 struct sock *sk;
2158 struct iucv_sock *iucv;
2159 struct af_iucv_trans_hdr *trans_hdr;
2160 char nullstring[8];
2161 int err = 0;
2162
Eugene Crosser979f66b2015-12-11 12:27:51 +01002163 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2164 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2165 (int)skb->len,
2166 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2167 kfree_skb(skb);
2168 return NET_RX_SUCCESS;
2169 }
2170 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2171 if (skb_linearize(skb)) {
2172 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2173 (int)skb->len);
2174 kfree_skb(skb);
2175 return NET_RX_SUCCESS;
2176 }
Ursula Braun3881ac42011-08-08 01:33:54 +00002177 skb_pull(skb, ETH_HLEN);
2178 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2179 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2180 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2181 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2182 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2183 memset(nullstring, 0, sizeof(nullstring));
2184 iucv = NULL;
2185 sk = NULL;
2186 read_lock(&iucv_sk_list.lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08002187 sk_for_each(sk, &iucv_sk_list.head) {
Ursula Braun3881ac42011-08-08 01:33:54 +00002188 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2189 if ((!memcmp(&iucv_sk(sk)->src_name,
2190 trans_hdr->destAppName, 8)) &&
2191 (!memcmp(&iucv_sk(sk)->src_user_id,
2192 trans_hdr->destUserID, 8)) &&
2193 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2194 (!memcmp(&iucv_sk(sk)->dst_user_id,
2195 nullstring, 8))) {
2196 iucv = iucv_sk(sk);
2197 break;
2198 }
2199 } else {
2200 if ((!memcmp(&iucv_sk(sk)->src_name,
2201 trans_hdr->destAppName, 8)) &&
2202 (!memcmp(&iucv_sk(sk)->src_user_id,
2203 trans_hdr->destUserID, 8)) &&
2204 (!memcmp(&iucv_sk(sk)->dst_name,
2205 trans_hdr->srcAppName, 8)) &&
2206 (!memcmp(&iucv_sk(sk)->dst_user_id,
2207 trans_hdr->srcUserID, 8))) {
2208 iucv = iucv_sk(sk);
2209 break;
2210 }
2211 }
2212 }
2213 read_unlock(&iucv_sk_list.lock);
2214 if (!iucv)
2215 sk = NULL;
2216
2217 /* no sock
2218 how should we send with no sock
2219 1) send without sock no send rc checking?
2220 2) introduce default sock to handle this cases
2221
2222 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2223 data -> send FIN
2224 SYN|ACK, SYN|FIN, FIN -> no action? */
2225
2226 switch (trans_hdr->flags) {
2227 case AF_IUCV_FLAG_SYN:
2228 /* connect request */
2229 err = afiucv_hs_callback_syn(sk, skb);
2230 break;
2231 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2232 /* connect request confirmed */
2233 err = afiucv_hs_callback_synack(sk, skb);
2234 break;
2235 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2236 /* connect request refused */
2237 err = afiucv_hs_callback_synfin(sk, skb);
2238 break;
2239 case (AF_IUCV_FLAG_FIN):
2240 /* close request */
2241 err = afiucv_hs_callback_fin(sk, skb);
2242 break;
2243 case (AF_IUCV_FLAG_WIN):
2244 err = afiucv_hs_callback_win(sk, skb);
Ursula Braun800c5eb2012-02-08 00:19:47 +00002245 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2246 kfree_skb(skb);
2247 break;
2248 }
Ursula Braun82492a32012-03-07 02:06:24 +00002249 /* fall through and receive non-zero length data */
2250 case (AF_IUCV_FLAG_SHT):
2251 /* shutdown request */
2252 /* fall through and receive zero length data */
Ursula Braun3881ac42011-08-08 01:33:54 +00002253 case 0:
2254 /* plain data frame */
Ursula Braunf9c41a62013-04-07 22:19:26 +00002255 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
Ursula Braun3881ac42011-08-08 01:33:54 +00002256 err = afiucv_hs_callback_rx(sk, skb);
2257 break;
2258 default:
2259 ;
2260 }
2261
2262 return err;
2263}
2264
2265/**
2266 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2267 * transport
2268 **/
2269static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2270 enum iucv_tx_notify n)
2271{
2272 struct sock *isk = skb->sk;
2273 struct sock *sk = NULL;
2274 struct iucv_sock *iucv = NULL;
2275 struct sk_buff_head *list;
2276 struct sk_buff *list_skb;
Ursula Braun800c5eb2012-02-08 00:19:47 +00002277 struct sk_buff *nskb;
Ursula Braun3881ac42011-08-08 01:33:54 +00002278 unsigned long flags;
Ursula Braun3881ac42011-08-08 01:33:54 +00002279
Ursula Braun800c5eb2012-02-08 00:19:47 +00002280 read_lock_irqsave(&iucv_sk_list.lock, flags);
Sasha Levinb67bfe02013-02-27 17:06:00 -08002281 sk_for_each(sk, &iucv_sk_list.head)
Ursula Braun3881ac42011-08-08 01:33:54 +00002282 if (sk == isk) {
2283 iucv = iucv_sk(sk);
2284 break;
2285 }
Ursula Braun800c5eb2012-02-08 00:19:47 +00002286 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
Ursula Braun3881ac42011-08-08 01:33:54 +00002287
Ursula Braun800c5eb2012-02-08 00:19:47 +00002288 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
Ursula Braun3881ac42011-08-08 01:33:54 +00002289 return;
2290
Ursula Braun3881ac42011-08-08 01:33:54 +00002291 list = &iucv->send_skb_q;
Ursula Braun800c5eb2012-02-08 00:19:47 +00002292 spin_lock_irqsave(&list->lock, flags);
Ursula Braun3881ac42011-08-08 01:33:54 +00002293 if (skb_queue_empty(list))
2294 goto out_unlock;
Ursula Braun800c5eb2012-02-08 00:19:47 +00002295 list_skb = list->next;
2296 nskb = list_skb->next;
Ursula Braun3881ac42011-08-08 01:33:54 +00002297 while (list_skb != (struct sk_buff *)list) {
2298 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
Ursula Braun3881ac42011-08-08 01:33:54 +00002299 switch (n) {
2300 case TX_NOTIFY_OK:
Ursula Braun800c5eb2012-02-08 00:19:47 +00002301 __skb_unlink(list_skb, list);
2302 kfree_skb(list_skb);
Ursula Braun3881ac42011-08-08 01:33:54 +00002303 iucv_sock_wake_msglim(sk);
Ursula Braun3881ac42011-08-08 01:33:54 +00002304 break;
2305 case TX_NOTIFY_PENDING:
2306 atomic_inc(&iucv->pendings);
2307 break;
2308 case TX_NOTIFY_DELAYED_OK:
Ursula Braun800c5eb2012-02-08 00:19:47 +00002309 __skb_unlink(list_skb, list);
Ursula Braun3881ac42011-08-08 01:33:54 +00002310 atomic_dec(&iucv->pendings);
2311 if (atomic_read(&iucv->pendings) <= 0)
2312 iucv_sock_wake_msglim(sk);
Ursula Braun800c5eb2012-02-08 00:19:47 +00002313 kfree_skb(list_skb);
Ursula Braun3881ac42011-08-08 01:33:54 +00002314 break;
2315 case TX_NOTIFY_UNREACHABLE:
2316 case TX_NOTIFY_DELAYED_UNREACHABLE:
2317 case TX_NOTIFY_TPQFULL: /* not yet used */
2318 case TX_NOTIFY_GENERALERROR:
2319 case TX_NOTIFY_DELAYED_GENERALERROR:
Ursula Braun800c5eb2012-02-08 00:19:47 +00002320 __skb_unlink(list_skb, list);
2321 kfree_skb(list_skb);
2322 if (sk->sk_state == IUCV_CONNECTED) {
2323 sk->sk_state = IUCV_DISCONN;
2324 sk->sk_state_change(sk);
2325 }
Ursula Braun3881ac42011-08-08 01:33:54 +00002326 break;
2327 }
2328 break;
2329 }
Ursula Braun800c5eb2012-02-08 00:19:47 +00002330 list_skb = nskb;
2331 nskb = nskb->next;
Ursula Braun3881ac42011-08-08 01:33:54 +00002332 }
Ursula Braun800c5eb2012-02-08 00:19:47 +00002333out_unlock:
Ursula Braun3881ac42011-08-08 01:33:54 +00002334 spin_unlock_irqrestore(&list->lock, flags);
2335
Ursula Braun42bd48e2011-12-19 22:56:28 +00002336 if (sk->sk_state == IUCV_CLOSING) {
2337 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2338 sk->sk_state = IUCV_CLOSED;
2339 sk->sk_state_change(sk);
2340 }
2341 }
2342
Ursula Braun3881ac42011-08-08 01:33:54 +00002343}
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002344
2345/*
2346 * afiucv_netdev_event: handle netdev notifier chain events
2347 */
2348static int afiucv_netdev_event(struct notifier_block *this,
2349 unsigned long event, void *ptr)
2350{
Jiri Pirko351638e2013-05-28 01:30:21 +00002351 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002352 struct sock *sk;
2353 struct iucv_sock *iucv;
2354
2355 switch (event) {
2356 case NETDEV_REBOOT:
2357 case NETDEV_GOING_DOWN:
Sasha Levinb67bfe02013-02-27 17:06:00 -08002358 sk_for_each(sk, &iucv_sk_list.head) {
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002359 iucv = iucv_sk(sk);
2360 if ((iucv->hs_dev == event_dev) &&
2361 (sk->sk_state == IUCV_CONNECTED)) {
2362 if (event == NETDEV_GOING_DOWN)
2363 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2364 sk->sk_state = IUCV_DISCONN;
2365 sk->sk_state_change(sk);
2366 }
2367 }
2368 break;
2369 case NETDEV_DOWN:
2370 case NETDEV_UNREGISTER:
2371 default:
2372 break;
2373 }
2374 return NOTIFY_DONE;
2375}
2376
2377static struct notifier_block afiucv_netdev_notifier = {
2378 .notifier_call = afiucv_netdev_event,
2379};
2380
Alexey Dobriyan5708e862009-09-14 12:23:23 +00002381static const struct proto_ops iucv_sock_ops = {
Jennifer Hunteac37312007-02-08 13:51:54 -08002382 .family = PF_IUCV,
2383 .owner = THIS_MODULE,
2384 .release = iucv_sock_release,
2385 .bind = iucv_sock_bind,
2386 .connect = iucv_sock_connect,
2387 .listen = iucv_sock_listen,
2388 .accept = iucv_sock_accept,
2389 .getname = iucv_sock_getname,
2390 .sendmsg = iucv_sock_sendmsg,
2391 .recvmsg = iucv_sock_recvmsg,
2392 .poll = iucv_sock_poll,
2393 .ioctl = sock_no_ioctl,
2394 .mmap = sock_no_mmap,
2395 .socketpair = sock_no_socketpair,
2396 .shutdown = iucv_sock_shutdown,
Hendrik Brueckner9d5c5d82009-04-21 23:26:22 +00002397 .setsockopt = iucv_sock_setsockopt,
2398 .getsockopt = iucv_sock_getsockopt,
Jennifer Hunteac37312007-02-08 13:51:54 -08002399};
2400
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00002401static const struct net_proto_family iucv_sock_family_ops = {
Jennifer Hunteac37312007-02-08 13:51:54 -08002402 .family = AF_IUCV,
2403 .owner = THIS_MODULE,
2404 .create = iucv_sock_create,
2405};
2406
Ursula Braun3881ac42011-08-08 01:33:54 +00002407static struct packet_type iucv_packet_type = {
2408 .type = cpu_to_be16(ETH_P_AF_IUCV),
2409 .func = afiucv_hs_rcv,
2410};
2411
2412static int afiucv_iucv_init(void)
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002413{
2414 int err;
2415
2416 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2417 if (err)
2418 goto out;
2419 /* establish dummy device */
2420 af_iucv_driver.bus = pr_iucv->bus;
2421 err = driver_register(&af_iucv_driver);
2422 if (err)
2423 goto out_iucv;
2424 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2425 if (!af_iucv_dev) {
2426 err = -ENOMEM;
2427 goto out_driver;
2428 }
2429 dev_set_name(af_iucv_dev, "af_iucv");
2430 af_iucv_dev->bus = pr_iucv->bus;
2431 af_iucv_dev->parent = pr_iucv->root;
2432 af_iucv_dev->release = (void (*)(struct device *))kfree;
2433 af_iucv_dev->driver = &af_iucv_driver;
2434 err = device_register(af_iucv_dev);
2435 if (err)
2436 goto out_driver;
2437 return 0;
2438
2439out_driver:
2440 driver_unregister(&af_iucv_driver);
2441out_iucv:
2442 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2443out:
2444 return err;
2445}
2446
Heiko Carstensda99f052007-05-04 12:23:27 -07002447static int __init afiucv_init(void)
Jennifer Hunteac37312007-02-08 13:51:54 -08002448{
2449 int err;
2450
Ursula Braun3881ac42011-08-08 01:33:54 +00002451 if (MACHINE_IS_VM) {
2452 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2453 if (unlikely(err)) {
2454 WARN_ON(err);
2455 err = -EPROTONOSUPPORT;
2456 goto out;
2457 }
Jennifer Hunteac37312007-02-08 13:51:54 -08002458
Ursula Braun3881ac42011-08-08 01:33:54 +00002459 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2460 if (!pr_iucv) {
2461 printk(KERN_WARNING "iucv_if lookup failed\n");
2462 memset(&iucv_userid, 0, sizeof(iucv_userid));
2463 }
2464 } else {
2465 memset(&iucv_userid, 0, sizeof(iucv_userid));
2466 pr_iucv = NULL;
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002467 }
2468
Jennifer Hunteac37312007-02-08 13:51:54 -08002469 err = proto_register(&iucv_proto, 0);
2470 if (err)
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002471 goto out;
Jennifer Hunteac37312007-02-08 13:51:54 -08002472 err = sock_register(&iucv_sock_family_ops);
2473 if (err)
2474 goto out_proto;
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002475
Ursula Braun3881ac42011-08-08 01:33:54 +00002476 if (pr_iucv) {
2477 err = afiucv_iucv_init();
2478 if (err)
2479 goto out_sock;
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002480 } else
2481 register_netdevice_notifier(&afiucv_netdev_notifier);
Ursula Braun3881ac42011-08-08 01:33:54 +00002482 dev_add_pack(&iucv_packet_type);
Jennifer Hunteac37312007-02-08 13:51:54 -08002483 return 0;
2484
Ursula Braunc23cad92009-06-16 10:30:44 +02002485out_sock:
2486 sock_unregister(PF_IUCV);
Jennifer Hunteac37312007-02-08 13:51:54 -08002487out_proto:
2488 proto_unregister(&iucv_proto);
Jennifer Hunteac37312007-02-08 13:51:54 -08002489out:
Frank Blaschka6fcd61f2011-08-08 01:33:51 +00002490 if (pr_iucv)
2491 symbol_put(iucv_if);
Jennifer Hunteac37312007-02-08 13:51:54 -08002492 return err;
2493}
2494
2495static void __exit afiucv_exit(void)
2496{
Ursula Braun3881ac42011-08-08 01:33:54 +00002497 if (pr_iucv) {
2498 device_unregister(af_iucv_dev);
2499 driver_unregister(&af_iucv_driver);
2500 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2501 symbol_put(iucv_if);
Ursula Braun9fbd87d2012-03-07 02:06:23 +00002502 } else
2503 unregister_netdevice_notifier(&afiucv_netdev_notifier);
Ursula Braun3881ac42011-08-08 01:33:54 +00002504 dev_remove_pack(&iucv_packet_type);
Jennifer Hunteac37312007-02-08 13:51:54 -08002505 sock_unregister(PF_IUCV);
2506 proto_unregister(&iucv_proto);
Jennifer Hunteac37312007-02-08 13:51:54 -08002507}
2508
2509module_init(afiucv_init);
2510module_exit(afiucv_exit);
2511
2512MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2513MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2514MODULE_VERSION(VERSION);
2515MODULE_LICENSE("GPL");
2516MODULE_ALIAS_NETPROTO(PF_IUCV);
Ursula Braun3881ac42011-08-08 01:33:54 +00002517