2 * linux/net/iucv/af_iucv.c
4 * IUCV protocol stack for Linux on zSeries
6 * Copyright 2006 IBM Corporation
8 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
11 #define KMSG_COMPONENT "af_iucv"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/list.h>
17 #include <linux/errno.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/skbuff.h>
22 #include <linux/init.h>
23 #include <linux/poll.h>
25 #include <asm/ebcdic.h>
26 #include <asm/cpcmd.h>
27 #include <linux/kmod.h>
29 #include <net/iucv/iucv.h>
30 #include <net/iucv/af_iucv.h>
32 #define CONFIG_IUCV_SOCK_DEBUG 1
37 static char iucv_userid[80];
39 static struct proto_ops iucv_sock_ops;
41 static struct proto iucv_proto = {
44 .obj_size = sizeof(struct iucv_sock),
47 static void iucv_sock_kill(struct sock *sk);
48 static void iucv_sock_close(struct sock *sk);
50 /* Call Back functions */
51 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
52 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
53 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
54 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
56 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
58 static struct iucv_sock_list iucv_sk_list = {
59 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
60 .autobind_name = ATOMIC_INIT(0)
63 static struct iucv_handler af_iucv_handler = {
64 .path_pending = iucv_callback_connreq,
65 .path_complete = iucv_callback_connack,
66 .path_severed = iucv_callback_connrej,
67 .message_pending = iucv_callback_rx,
68 .message_complete = iucv_callback_txdone
71 static inline void high_nmcpy(unsigned char *dst, char *src)
76 static inline void low_nmcpy(unsigned char *dst, char *src)
78 memcpy(&dst[8], src, 8);
82 static void iucv_sock_timeout(unsigned long arg)
84 struct sock *sk = (struct sock *)arg;
87 sk->sk_err = ETIMEDOUT;
88 sk->sk_state_change(sk);
95 static void iucv_sock_clear_timer(struct sock *sk)
97 sk_stop_timer(sk, &sk->sk_timer);
100 static struct sock *__iucv_get_sock_by_name(char *nm)
103 struct hlist_node *node;
105 sk_for_each(sk, node, &iucv_sk_list.head)
106 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
112 static void iucv_sock_destruct(struct sock *sk)
114 skb_queue_purge(&sk->sk_receive_queue);
115 skb_queue_purge(&sk->sk_write_queue);
119 static void iucv_sock_cleanup_listen(struct sock *parent)
123 /* Close non-accepted connections */
124 while ((sk = iucv_accept_dequeue(parent, NULL))) {
129 parent->sk_state = IUCV_CLOSED;
130 sock_set_flag(parent, SOCK_ZAPPED);
134 static void iucv_sock_kill(struct sock *sk)
136 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
139 iucv_sock_unlink(&iucv_sk_list, sk);
140 sock_set_flag(sk, SOCK_DEAD);
144 /* Close an IUCV socket */
145 static void iucv_sock_close(struct sock *sk)
147 unsigned char user_data[16];
148 struct iucv_sock *iucv = iucv_sk(sk);
152 iucv_sock_clear_timer(sk);
155 switch (sk->sk_state) {
157 iucv_sock_cleanup_listen(sk);
164 sk->sk_state = IUCV_CLOSING;
165 sk->sk_state_change(sk);
167 if (!skb_queue_empty(&iucv->send_skb_q)) {
168 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
169 timeo = sk->sk_lingertime;
171 timeo = IUCV_DISCONN_TIMEOUT;
172 err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
175 case IUCV_CLOSING: /* fall through */
176 sk->sk_state = IUCV_CLOSED;
177 sk->sk_state_change(sk);
180 low_nmcpy(user_data, iucv->src_name);
181 high_nmcpy(user_data, iucv->dst_name);
182 ASCEBC(user_data, sizeof(user_data));
183 err = iucv_path_sever(iucv->path, user_data);
184 iucv_path_free(iucv->path);
188 sk->sk_err = ECONNRESET;
189 sk->sk_state_change(sk);
191 skb_queue_purge(&iucv->send_skb_q);
192 skb_queue_purge(&iucv->backlog_skb_q);
194 sock_set_flag(sk, SOCK_ZAPPED);
198 sock_set_flag(sk, SOCK_ZAPPED);
206 static void iucv_sock_init(struct sock *sk, struct sock *parent)
209 sk->sk_type = parent->sk_type;
212 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
216 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
220 sock_init_data(sock, sk);
221 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
222 spin_lock_init(&iucv_sk(sk)->accept_q_lock);
223 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
224 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
225 spin_lock_init(&iucv_sk(sk)->message_q.lock);
226 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
227 iucv_sk(sk)->send_tag = 0;
228 iucv_sk(sk)->path = NULL;
229 memset(&iucv_sk(sk)->src_user_id , 0, 32);
231 sk->sk_destruct = iucv_sock_destruct;
232 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
233 sk->sk_allocation = GFP_DMA;
235 sock_reset_flag(sk, SOCK_ZAPPED);
237 sk->sk_protocol = proto;
238 sk->sk_state = IUCV_OPEN;
240 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
242 iucv_sock_link(&iucv_sk_list, sk);
246 /* Create an IUCV socket */
247 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
251 if (sock->type != SOCK_STREAM)
252 return -ESOCKTNOSUPPORT;
254 sock->state = SS_UNCONNECTED;
255 sock->ops = &iucv_sock_ops;
257 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
261 iucv_sock_init(sk, NULL);
266 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
268 write_lock_bh(&l->lock);
269 sk_add_node(sk, &l->head);
270 write_unlock_bh(&l->lock);
273 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
275 write_lock_bh(&l->lock);
276 sk_del_node_init(sk);
277 write_unlock_bh(&l->lock);
280 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
283 struct iucv_sock *par = iucv_sk(parent);
286 spin_lock_irqsave(&par->accept_q_lock, flags);
287 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
288 spin_unlock_irqrestore(&par->accept_q_lock, flags);
289 iucv_sk(sk)->parent = parent;
290 parent->sk_ack_backlog++;
293 void iucv_accept_unlink(struct sock *sk)
296 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
298 spin_lock_irqsave(&par->accept_q_lock, flags);
299 list_del_init(&iucv_sk(sk)->accept_q);
300 spin_unlock_irqrestore(&par->accept_q_lock, flags);
301 iucv_sk(sk)->parent->sk_ack_backlog--;
302 iucv_sk(sk)->parent = NULL;
306 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
308 struct iucv_sock *isk, *n;
311 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
312 sk = (struct sock *) isk;
315 if (sk->sk_state == IUCV_CLOSED) {
316 iucv_accept_unlink(sk);
321 if (sk->sk_state == IUCV_CONNECTED ||
322 sk->sk_state == IUCV_SEVERED ||
324 iucv_accept_unlink(sk);
326 sock_graft(sk, newsock);
328 if (sk->sk_state == IUCV_SEVERED)
329 sk->sk_state = IUCV_DISCONN;
340 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
343 DECLARE_WAITQUEUE(wait, current);
346 add_wait_queue(sk->sk_sleep, &wait);
347 while (sk->sk_state != state && sk->sk_state != state2) {
348 set_current_state(TASK_INTERRUPTIBLE);
355 if (signal_pending(current)) {
356 err = sock_intr_errno(timeo);
361 timeo = schedule_timeout(timeo);
364 err = sock_error(sk);
368 set_current_state(TASK_RUNNING);
369 remove_wait_queue(sk->sk_sleep, &wait);
373 /* Bind an unbound socket */
374 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
377 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
378 struct sock *sk = sock->sk;
379 struct iucv_sock *iucv;
382 /* Verify the input sockaddr */
383 if (!addr || addr->sa_family != AF_IUCV)
387 if (sk->sk_state != IUCV_OPEN) {
392 write_lock_bh(&iucv_sk_list.lock);
395 if (__iucv_get_sock_by_name(sa->siucv_name)) {
404 /* Bind the socket */
405 memcpy(iucv->src_name, sa->siucv_name, 8);
407 /* Copy the user id */
408 memcpy(iucv->src_user_id, iucv_userid, 8);
409 sk->sk_state = IUCV_BOUND;
413 /* Release the socket list lock */
414 write_unlock_bh(&iucv_sk_list.lock);
420 /* Automatically bind an unbound socket */
421 static int iucv_sock_autobind(struct sock *sk)
423 struct iucv_sock *iucv = iucv_sk(sk);
424 char query_buffer[80];
428 /* Set the userid and name */
429 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
433 memcpy(iucv->src_user_id, query_buffer, 8);
435 write_lock_bh(&iucv_sk_list.lock);
437 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
438 while (__iucv_get_sock_by_name(name)) {
439 sprintf(name, "%08x",
440 atomic_inc_return(&iucv_sk_list.autobind_name));
443 write_unlock_bh(&iucv_sk_list.lock);
445 memcpy(&iucv->src_name, name, 8);
450 /* Connect an unconnected socket */
451 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
454 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
455 struct sock *sk = sock->sk;
456 struct iucv_sock *iucv;
457 unsigned char user_data[16];
460 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
463 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
466 if (sk->sk_type != SOCK_STREAM)
471 if (sk->sk_state == IUCV_OPEN) {
472 err = iucv_sock_autobind(sk);
479 /* Set the destination information */
480 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
481 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
483 high_nmcpy(user_data, sa->siucv_name);
484 low_nmcpy(user_data, iucv_sk(sk)->src_name);
485 ASCEBC(user_data, sizeof(user_data));
489 iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
490 IPRMDATA, GFP_KERNEL);
495 err = iucv_path_connect(iucv->path, &af_iucv_handler,
496 sa->siucv_user_id, NULL, user_data, sk);
498 iucv_path_free(iucv->path);
501 case 0x0b: /* Target communicator is not logged on */
504 case 0x0d: /* Max connections for this guest exceeded */
505 case 0x0e: /* Max connections for target guest exceeded */
508 case 0x0f: /* Missing IUCV authorization */
518 if (sk->sk_state != IUCV_CONNECTED) {
519 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
520 sock_sndtimeo(sk, flags & O_NONBLOCK));
523 if (sk->sk_state == IUCV_DISCONN) {
525 return -ECONNREFUSED;
529 iucv_path_sever(iucv->path, NULL);
530 iucv_path_free(iucv->path);
539 /* Move a socket into listening state. */
540 static int iucv_sock_listen(struct socket *sock, int backlog)
542 struct sock *sk = sock->sk;
548 if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
551 sk->sk_max_ack_backlog = backlog;
552 sk->sk_ack_backlog = 0;
553 sk->sk_state = IUCV_LISTEN;
561 /* Accept a pending connection */
562 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
565 DECLARE_WAITQUEUE(wait, current);
566 struct sock *sk = sock->sk, *nsk;
570 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
572 if (sk->sk_state != IUCV_LISTEN) {
577 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
579 /* Wait for an incoming connection */
580 add_wait_queue_exclusive(sk->sk_sleep, &wait);
581 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
582 set_current_state(TASK_INTERRUPTIBLE);
589 timeo = schedule_timeout(timeo);
590 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
592 if (sk->sk_state != IUCV_LISTEN) {
597 if (signal_pending(current)) {
598 err = sock_intr_errno(timeo);
603 set_current_state(TASK_RUNNING);
604 remove_wait_queue(sk->sk_sleep, &wait);
609 newsock->state = SS_CONNECTED;
616 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
619 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
620 struct sock *sk = sock->sk;
622 addr->sa_family = AF_IUCV;
623 *len = sizeof(struct sockaddr_iucv);
626 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
627 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
629 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
630 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
632 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
633 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
634 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
639 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
640 struct msghdr *msg, size_t len)
642 struct sock *sk = sock->sk;
643 struct iucv_sock *iucv = iucv_sk(sk);
645 struct iucv_message txmsg;
650 err = sock_error(sk);
654 if (msg->msg_flags & MSG_OOB)
659 if (sk->sk_shutdown & SEND_SHUTDOWN) {
664 if (sk->sk_state == IUCV_CONNECTED) {
665 if (!(skb = sock_alloc_send_skb(sk, len,
666 msg->msg_flags & MSG_DONTWAIT,
670 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
676 memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len);
677 txmsg.tag = iucv->send_tag++;
678 memcpy(skb->cb, &txmsg.tag, 4);
679 skb_queue_tail(&iucv->send_skb_q, skb);
680 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
681 (void *) skb->data, skb->len);
685 memcpy(user_id, iucv->dst_user_id, 8);
687 memcpy(appl_id, iucv->dst_name, 8);
688 pr_err("Application %s on z/VM guest %s"
689 " exceeds message limit\n",
692 skb_unlink(skb, &iucv->send_skb_q);
712 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
714 int dataleft, size, copied = 0;
715 struct sk_buff *nskb;
719 if (dataleft >= sk->sk_rcvbuf / 4)
720 size = sk->sk_rcvbuf / 4;
724 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
728 memcpy(nskb->data, skb->data + copied, size);
732 skb_reset_transport_header(nskb);
733 skb_reset_network_header(nskb);
736 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
742 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
743 struct iucv_path *path,
744 struct iucv_message *msg)
748 if (msg->flags & IPRMDATA) {
752 rc = iucv_message_receive(path, msg, 0, skb->data,
758 if (skb->truesize >= sk->sk_rcvbuf / 4) {
759 rc = iucv_fragment_skb(sk, skb, msg->length);
763 iucv_path_sever(path, NULL);
766 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
768 skb_reset_transport_header(skb);
769 skb_reset_network_header(skb);
770 skb->len = msg->length;
774 if (sock_queue_rcv_skb(sk, skb))
775 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
778 static void iucv_process_message_q(struct sock *sk)
780 struct iucv_sock *iucv = iucv_sk(sk);
782 struct sock_msg_q *p, *n;
784 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
785 skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA);
788 iucv_process_message(sk, skb, p->path, &p->msg);
791 if (!skb_queue_empty(&iucv->backlog_skb_q))
796 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
797 struct msghdr *msg, size_t len, int flags)
799 int noblock = flags & MSG_DONTWAIT;
800 struct sock *sk = sock->sk;
801 struct iucv_sock *iucv = iucv_sk(sk);
802 int target, copied = 0;
803 struct sk_buff *skb, *rskb, *cskb;
806 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
807 skb_queue_empty(&iucv->backlog_skb_q) &&
808 skb_queue_empty(&sk->sk_receive_queue) &&
809 list_empty(&iucv->message_q.list))
812 if (flags & (MSG_OOB))
815 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
817 /* receive/dequeue next skb:
818 * the function understands MSG_PEEK and, thus, does not dequeue skb */
819 skb = skb_recv_datagram(sk, flags, noblock, &err);
821 if (sk->sk_shutdown & RCV_SHUTDOWN)
826 copied = min_t(unsigned int, skb->len, len);
829 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
830 skb_queue_head(&sk->sk_receive_queue, skb);
838 /* Mark read part of skb as used */
839 if (!(flags & MSG_PEEK)) {
840 skb_pull(skb, copied);
843 skb_queue_head(&sk->sk_receive_queue, skb);
849 /* Queue backlog skbs */
850 rskb = skb_dequeue(&iucv->backlog_skb_q);
852 if (sock_queue_rcv_skb(sk, rskb)) {
853 skb_queue_head(&iucv->backlog_skb_q,
857 rskb = skb_dequeue(&iucv->backlog_skb_q);
860 if (skb_queue_empty(&iucv->backlog_skb_q)) {
861 spin_lock_bh(&iucv->message_q.lock);
862 if (!list_empty(&iucv->message_q.list))
863 iucv_process_message_q(sk);
864 spin_unlock_bh(&iucv->message_q.lock);
869 return err ? : copied;
872 static inline unsigned int iucv_accept_poll(struct sock *parent)
874 struct iucv_sock *isk, *n;
877 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
878 sk = (struct sock *) isk;
880 if (sk->sk_state == IUCV_CONNECTED)
881 return POLLIN | POLLRDNORM;
887 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
890 struct sock *sk = sock->sk;
891 unsigned int mask = 0;
893 poll_wait(file, sk->sk_sleep, wait);
895 if (sk->sk_state == IUCV_LISTEN)
896 return iucv_accept_poll(sk);
898 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
901 if (sk->sk_shutdown & RCV_SHUTDOWN)
904 if (sk->sk_shutdown == SHUTDOWN_MASK)
907 if (!skb_queue_empty(&sk->sk_receive_queue) ||
908 (sk->sk_shutdown & RCV_SHUTDOWN))
909 mask |= POLLIN | POLLRDNORM;
911 if (sk->sk_state == IUCV_CLOSED)
914 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
917 if (sock_writeable(sk))
918 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
920 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
925 static int iucv_sock_shutdown(struct socket *sock, int how)
927 struct sock *sk = sock->sk;
928 struct iucv_sock *iucv = iucv_sk(sk);
929 struct iucv_message txmsg;
931 u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
935 if ((how & ~SHUTDOWN_MASK) || !how)
939 switch (sk->sk_state) {
948 sk->sk_shutdown |= how;
952 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
955 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
972 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
973 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
977 skb_queue_purge(&sk->sk_receive_queue);
980 /* Wake up anyone sleeping in poll */
981 sk->sk_state_change(sk);
988 static int iucv_sock_release(struct socket *sock)
990 struct sock *sk = sock->sk;
998 /* Unregister with IUCV base support */
999 if (iucv_sk(sk)->path) {
1000 iucv_path_sever(iucv_sk(sk)->path, NULL);
1001 iucv_path_free(iucv_sk(sk)->path);
1002 iucv_sk(sk)->path = NULL;
1010 /* Callback wrappers - called from iucv base support */
1011 static int iucv_callback_connreq(struct iucv_path *path,
1012 u8 ipvmid[8], u8 ipuser[16])
1014 unsigned char user_data[16];
1015 unsigned char nuser_data[16];
1016 unsigned char src_name[8];
1017 struct hlist_node *node;
1018 struct sock *sk, *nsk;
1019 struct iucv_sock *iucv, *niucv;
1022 memcpy(src_name, ipuser, 8);
1023 EBCASC(src_name, 8);
1024 /* Find out if this path belongs to af_iucv. */
1025 read_lock(&iucv_sk_list.lock);
1028 sk_for_each(sk, node, &iucv_sk_list.head)
1029 if (sk->sk_state == IUCV_LISTEN &&
1030 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1032 * Found a listening socket with
1033 * src_name == ipuser[0-7].
1038 read_unlock(&iucv_sk_list.lock);
1040 /* No socket found, not one of our paths. */
1045 /* Check if parent socket is listening */
1046 low_nmcpy(user_data, iucv->src_name);
1047 high_nmcpy(user_data, iucv->dst_name);
1048 ASCEBC(user_data, sizeof(user_data));
1049 if (sk->sk_state != IUCV_LISTEN) {
1050 err = iucv_path_sever(path, user_data);
1051 iucv_path_free(path);
1055 /* Check for backlog size */
1056 if (sk_acceptq_is_full(sk)) {
1057 err = iucv_path_sever(path, user_data);
1058 iucv_path_free(path);
1062 /* Create the new socket */
1063 nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
1065 err = iucv_path_sever(path, user_data);
1066 iucv_path_free(path);
1070 niucv = iucv_sk(nsk);
1071 iucv_sock_init(nsk, sk);
1073 /* Set the new iucv_sock */
1074 memcpy(niucv->dst_name, ipuser + 8, 8);
1075 EBCASC(niucv->dst_name, 8);
1076 memcpy(niucv->dst_user_id, ipvmid, 8);
1077 memcpy(niucv->src_name, iucv->src_name, 8);
1078 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1081 /* Call iucv_accept */
1082 high_nmcpy(nuser_data, ipuser + 8);
1083 memcpy(nuser_data + 8, niucv->src_name, 8);
1084 ASCEBC(nuser_data + 8, 8);
1086 path->msglim = IUCV_QUEUELEN_DEFAULT;
1087 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1089 err = iucv_path_sever(path, user_data);
1090 iucv_path_free(path);
1091 iucv_sock_kill(nsk);
1095 iucv_accept_enqueue(sk, nsk);
1097 /* Wake up accept */
1098 nsk->sk_state = IUCV_CONNECTED;
1099 sk->sk_data_ready(sk, 1);
1106 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1108 struct sock *sk = path->private;
1110 sk->sk_state = IUCV_CONNECTED;
1111 sk->sk_state_change(sk);
1114 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1116 struct sock *sk = path->private;
1117 struct iucv_sock *iucv = iucv_sk(sk);
1118 struct sk_buff *skb;
1119 struct sock_msg_q *save_msg;
1122 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1123 iucv_message_reject(path, msg);
1127 spin_lock(&iucv->message_q.lock);
1129 if (!list_empty(&iucv->message_q.list) ||
1130 !skb_queue_empty(&iucv->backlog_skb_q))
1133 len = atomic_read(&sk->sk_rmem_alloc);
1134 len += msg->length + sizeof(struct sk_buff);
1135 if (len > sk->sk_rcvbuf)
1138 skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
1142 iucv_process_message(sk, skb, path, msg);
1148 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1151 save_msg->path = path;
1152 save_msg->msg = *msg;
1154 list_add_tail(&save_msg->list, &iucv->message_q.list);
1157 spin_unlock(&iucv->message_q.lock);
1160 static void iucv_callback_txdone(struct iucv_path *path,
1161 struct iucv_message *msg)
1163 struct sock *sk = path->private;
1164 struct sk_buff *this = NULL;
1165 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1166 struct sk_buff *list_skb = list->next;
1167 unsigned long flags;
1169 if (!skb_queue_empty(list)) {
1170 spin_lock_irqsave(&list->lock, flags);
1172 while (list_skb != (struct sk_buff *)list) {
1173 if (!memcmp(&msg->tag, list_skb->cb, 4)) {
1177 list_skb = list_skb->next;
1180 __skb_unlink(this, list);
1182 spin_unlock_irqrestore(&list->lock, flags);
1188 if (sk->sk_state == IUCV_CLOSING) {
1189 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1190 sk->sk_state = IUCV_CLOSED;
1191 sk->sk_state_change(sk);
1197 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1199 struct sock *sk = path->private;
1201 if (!list_empty(&iucv_sk(sk)->accept_q))
1202 sk->sk_state = IUCV_SEVERED;
1204 sk->sk_state = IUCV_DISCONN;
1206 sk->sk_state_change(sk);
1209 static struct proto_ops iucv_sock_ops = {
1211 .owner = THIS_MODULE,
1212 .release = iucv_sock_release,
1213 .bind = iucv_sock_bind,
1214 .connect = iucv_sock_connect,
1215 .listen = iucv_sock_listen,
1216 .accept = iucv_sock_accept,
1217 .getname = iucv_sock_getname,
1218 .sendmsg = iucv_sock_sendmsg,
1219 .recvmsg = iucv_sock_recvmsg,
1220 .poll = iucv_sock_poll,
1221 .ioctl = sock_no_ioctl,
1222 .mmap = sock_no_mmap,
1223 .socketpair = sock_no_socketpair,
1224 .shutdown = iucv_sock_shutdown,
1225 .setsockopt = sock_no_setsockopt,
1226 .getsockopt = sock_no_getsockopt
1229 static struct net_proto_family iucv_sock_family_ops = {
1231 .owner = THIS_MODULE,
1232 .create = iucv_sock_create,
1235 static int __init afiucv_init(void)
1239 if (!MACHINE_IS_VM) {
1240 pr_err("The af_iucv module cannot be loaded"
1242 err = -EPROTONOSUPPORT;
1245 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1246 if (unlikely(err)) {
1248 err = -EPROTONOSUPPORT;
1252 err = iucv_register(&af_iucv_handler, 0);
1255 err = proto_register(&iucv_proto, 0);
1258 err = sock_register(&iucv_sock_family_ops);
1264 proto_unregister(&iucv_proto);
1266 iucv_unregister(&af_iucv_handler, 0);
1271 static void __exit afiucv_exit(void)
1273 sock_unregister(PF_IUCV);
1274 proto_unregister(&iucv_proto);
1275 iucv_unregister(&af_iucv_handler, 0);
1278 module_init(afiucv_init);
1279 module_exit(afiucv_exit);
1281 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1282 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1283 MODULE_VERSION(VERSION);
1284 MODULE_LICENSE("GPL");
1285 MODULE_ALIAS_NETPROTO(PF_IUCV);