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>
34 static char iucv_userid[80];
36 static struct proto_ops iucv_sock_ops;
38 static struct proto iucv_proto = {
41 .obj_size = sizeof(struct iucv_sock),
44 /* special AF_IUCV IPRM messages */
45 static const u8 iprm_shutdown[8] =
46 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
48 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
50 /* macros to set/get socket control buffer at correct offset */
51 #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */
52 #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag))
53 #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
54 #define CB_TRGCLS_LEN (TRGCLS_SIZE)
57 static void iucv_sock_kill(struct sock *sk);
58 static void iucv_sock_close(struct sock *sk);
60 /* Call Back functions */
61 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
62 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
63 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
64 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
66 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
67 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
69 static struct iucv_sock_list iucv_sk_list = {
70 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
71 .autobind_name = ATOMIC_INIT(0)
74 static struct iucv_handler af_iucv_handler = {
75 .path_pending = iucv_callback_connreq,
76 .path_complete = iucv_callback_connack,
77 .path_severed = iucv_callback_connrej,
78 .message_pending = iucv_callback_rx,
79 .message_complete = iucv_callback_txdone,
80 .path_quiesced = iucv_callback_shutdown,
83 static inline void high_nmcpy(unsigned char *dst, char *src)
88 static inline void low_nmcpy(unsigned char *dst, char *src)
90 memcpy(&dst[8], src, 8);
94 * iucv_msg_length() - Returns the length of an iucv message.
95 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
97 * The function returns the length of the specified iucv message @msg of data
98 * stored in a buffer and of data stored in the parameter list (PRMDATA).
100 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
102 * PRMDATA[0..6] socket data (max 7 bytes);
103 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
105 * The socket data length is computed by substracting the socket data length
107 * If the socket data len is greater 7, then PRMDATA can be used for special
108 * notifications (see iucv_sock_shutdown); and further,
109 * if the socket data len is > 7, the function returns 8.
111 * Use this function to allocate socket buffers to store iucv message data.
113 static inline size_t iucv_msg_length(struct iucv_message *msg)
117 if (msg->flags & IUCV_IPRMDATA) {
118 datalen = 0xff - msg->rmmsg[7];
119 return (datalen < 8) ? datalen : 8;
125 static void iucv_sock_timeout(unsigned long arg)
127 struct sock *sk = (struct sock *)arg;
130 sk->sk_err = ETIMEDOUT;
131 sk->sk_state_change(sk);
138 static void iucv_sock_clear_timer(struct sock *sk)
140 sk_stop_timer(sk, &sk->sk_timer);
143 static struct sock *__iucv_get_sock_by_name(char *nm)
146 struct hlist_node *node;
148 sk_for_each(sk, node, &iucv_sk_list.head)
149 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
155 static void iucv_sock_destruct(struct sock *sk)
157 skb_queue_purge(&sk->sk_receive_queue);
158 skb_queue_purge(&sk->sk_write_queue);
162 static void iucv_sock_cleanup_listen(struct sock *parent)
166 /* Close non-accepted connections */
167 while ((sk = iucv_accept_dequeue(parent, NULL))) {
172 parent->sk_state = IUCV_CLOSED;
173 sock_set_flag(parent, SOCK_ZAPPED);
177 static void iucv_sock_kill(struct sock *sk)
179 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
182 iucv_sock_unlink(&iucv_sk_list, sk);
183 sock_set_flag(sk, SOCK_DEAD);
187 /* Close an IUCV socket */
188 static void iucv_sock_close(struct sock *sk)
190 unsigned char user_data[16];
191 struct iucv_sock *iucv = iucv_sk(sk);
195 iucv_sock_clear_timer(sk);
198 switch (sk->sk_state) {
200 iucv_sock_cleanup_listen(sk);
207 sk->sk_state = IUCV_CLOSING;
208 sk->sk_state_change(sk);
210 if (!skb_queue_empty(&iucv->send_skb_q)) {
211 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
212 timeo = sk->sk_lingertime;
214 timeo = IUCV_DISCONN_TIMEOUT;
215 err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
218 case IUCV_CLOSING: /* fall through */
219 sk->sk_state = IUCV_CLOSED;
220 sk->sk_state_change(sk);
223 low_nmcpy(user_data, iucv->src_name);
224 high_nmcpy(user_data, iucv->dst_name);
225 ASCEBC(user_data, sizeof(user_data));
226 err = iucv_path_sever(iucv->path, user_data);
227 iucv_path_free(iucv->path);
231 sk->sk_err = ECONNRESET;
232 sk->sk_state_change(sk);
234 skb_queue_purge(&iucv->send_skb_q);
235 skb_queue_purge(&iucv->backlog_skb_q);
237 sock_set_flag(sk, SOCK_ZAPPED);
241 sock_set_flag(sk, SOCK_ZAPPED);
249 static void iucv_sock_init(struct sock *sk, struct sock *parent)
252 sk->sk_type = parent->sk_type;
255 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
259 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
263 sock_init_data(sock, sk);
264 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
265 spin_lock_init(&iucv_sk(sk)->accept_q_lock);
266 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
267 INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
268 spin_lock_init(&iucv_sk(sk)->message_q.lock);
269 skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
270 iucv_sk(sk)->send_tag = 0;
271 iucv_sk(sk)->flags = 0;
272 iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT;
273 iucv_sk(sk)->path = NULL;
274 memset(&iucv_sk(sk)->src_user_id , 0, 32);
276 sk->sk_destruct = iucv_sock_destruct;
277 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
278 sk->sk_allocation = GFP_DMA;
280 sock_reset_flag(sk, SOCK_ZAPPED);
282 sk->sk_protocol = proto;
283 sk->sk_state = IUCV_OPEN;
285 setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
287 iucv_sock_link(&iucv_sk_list, sk);
291 /* Create an IUCV socket */
292 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
296 if (protocol && protocol != PF_IUCV)
297 return -EPROTONOSUPPORT;
299 sock->state = SS_UNCONNECTED;
301 switch (sock->type) {
303 sock->ops = &iucv_sock_ops;
306 /* currently, proto ops can handle both sk types */
307 sock->ops = &iucv_sock_ops;
310 return -ESOCKTNOSUPPORT;
313 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
317 iucv_sock_init(sk, NULL);
322 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
324 write_lock_bh(&l->lock);
325 sk_add_node(sk, &l->head);
326 write_unlock_bh(&l->lock);
329 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
331 write_lock_bh(&l->lock);
332 sk_del_node_init(sk);
333 write_unlock_bh(&l->lock);
336 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
339 struct iucv_sock *par = iucv_sk(parent);
342 spin_lock_irqsave(&par->accept_q_lock, flags);
343 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
344 spin_unlock_irqrestore(&par->accept_q_lock, flags);
345 iucv_sk(sk)->parent = parent;
346 parent->sk_ack_backlog++;
349 void iucv_accept_unlink(struct sock *sk)
352 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
354 spin_lock_irqsave(&par->accept_q_lock, flags);
355 list_del_init(&iucv_sk(sk)->accept_q);
356 spin_unlock_irqrestore(&par->accept_q_lock, flags);
357 iucv_sk(sk)->parent->sk_ack_backlog--;
358 iucv_sk(sk)->parent = NULL;
362 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
364 struct iucv_sock *isk, *n;
367 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
368 sk = (struct sock *) isk;
371 if (sk->sk_state == IUCV_CLOSED) {
372 iucv_accept_unlink(sk);
377 if (sk->sk_state == IUCV_CONNECTED ||
378 sk->sk_state == IUCV_SEVERED ||
380 iucv_accept_unlink(sk);
382 sock_graft(sk, newsock);
384 if (sk->sk_state == IUCV_SEVERED)
385 sk->sk_state = IUCV_DISCONN;
396 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
399 DECLARE_WAITQUEUE(wait, current);
402 add_wait_queue(sk->sk_sleep, &wait);
403 while (sk->sk_state != state && sk->sk_state != state2) {
404 set_current_state(TASK_INTERRUPTIBLE);
411 if (signal_pending(current)) {
412 err = sock_intr_errno(timeo);
417 timeo = schedule_timeout(timeo);
420 err = sock_error(sk);
424 set_current_state(TASK_RUNNING);
425 remove_wait_queue(sk->sk_sleep, &wait);
429 /* Bind an unbound socket */
430 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
433 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
434 struct sock *sk = sock->sk;
435 struct iucv_sock *iucv;
438 /* Verify the input sockaddr */
439 if (!addr || addr->sa_family != AF_IUCV)
443 if (sk->sk_state != IUCV_OPEN) {
448 write_lock_bh(&iucv_sk_list.lock);
451 if (__iucv_get_sock_by_name(sa->siucv_name)) {
460 /* Bind the socket */
461 memcpy(iucv->src_name, sa->siucv_name, 8);
463 /* Copy the user id */
464 memcpy(iucv->src_user_id, iucv_userid, 8);
465 sk->sk_state = IUCV_BOUND;
469 /* Release the socket list lock */
470 write_unlock_bh(&iucv_sk_list.lock);
476 /* Automatically bind an unbound socket */
477 static int iucv_sock_autobind(struct sock *sk)
479 struct iucv_sock *iucv = iucv_sk(sk);
480 char query_buffer[80];
484 /* Set the userid and name */
485 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
489 memcpy(iucv->src_user_id, query_buffer, 8);
491 write_lock_bh(&iucv_sk_list.lock);
493 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
494 while (__iucv_get_sock_by_name(name)) {
495 sprintf(name, "%08x",
496 atomic_inc_return(&iucv_sk_list.autobind_name));
499 write_unlock_bh(&iucv_sk_list.lock);
501 memcpy(&iucv->src_name, name, 8);
506 /* Connect an unconnected socket */
507 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
510 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
511 struct sock *sk = sock->sk;
512 struct iucv_sock *iucv;
513 unsigned char user_data[16];
516 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
519 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
522 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
525 if (sk->sk_state == IUCV_OPEN) {
526 err = iucv_sock_autobind(sk);
533 /* Set the destination information */
534 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
535 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
537 high_nmcpy(user_data, sa->siucv_name);
538 low_nmcpy(user_data, iucv_sk(sk)->src_name);
539 ASCEBC(user_data, sizeof(user_data));
543 iucv->path = iucv_path_alloc(iucv->msglimit,
544 IUCV_IPRMDATA, GFP_KERNEL);
549 err = iucv_path_connect(iucv->path, &af_iucv_handler,
550 sa->siucv_user_id, NULL, user_data, sk);
552 iucv_path_free(iucv->path);
555 case 0x0b: /* Target communicator is not logged on */
558 case 0x0d: /* Max connections for this guest exceeded */
559 case 0x0e: /* Max connections for target guest exceeded */
562 case 0x0f: /* Missing IUCV authorization */
572 if (sk->sk_state != IUCV_CONNECTED) {
573 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
574 sock_sndtimeo(sk, flags & O_NONBLOCK));
577 if (sk->sk_state == IUCV_DISCONN) {
582 iucv_path_sever(iucv->path, NULL);
583 iucv_path_free(iucv->path);
592 /* Move a socket into listening state. */
593 static int iucv_sock_listen(struct socket *sock, int backlog)
595 struct sock *sk = sock->sk;
601 if (sk->sk_state != IUCV_BOUND)
604 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
607 sk->sk_max_ack_backlog = backlog;
608 sk->sk_ack_backlog = 0;
609 sk->sk_state = IUCV_LISTEN;
617 /* Accept a pending connection */
618 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
621 DECLARE_WAITQUEUE(wait, current);
622 struct sock *sk = sock->sk, *nsk;
626 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
628 if (sk->sk_state != IUCV_LISTEN) {
633 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
635 /* Wait for an incoming connection */
636 add_wait_queue_exclusive(sk->sk_sleep, &wait);
637 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
638 set_current_state(TASK_INTERRUPTIBLE);
645 timeo = schedule_timeout(timeo);
646 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
648 if (sk->sk_state != IUCV_LISTEN) {
653 if (signal_pending(current)) {
654 err = sock_intr_errno(timeo);
659 set_current_state(TASK_RUNNING);
660 remove_wait_queue(sk->sk_sleep, &wait);
665 newsock->state = SS_CONNECTED;
672 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
675 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
676 struct sock *sk = sock->sk;
678 addr->sa_family = AF_IUCV;
679 *len = sizeof(struct sockaddr_iucv);
682 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
683 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
685 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
686 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
688 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
689 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
690 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
696 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
698 * @msg: Pointer to a struct iucv_message
699 * @skb: The socket data to send, skb->len MUST BE <= 7
701 * Send the socket data in the parameter list in the iucv message
702 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
703 * list and the socket data len at index 7 (last byte).
704 * See also iucv_msg_length().
706 * Returns the error code from the iucv_message_send() call.
708 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
713 memcpy(prmdata, (void *) skb->data, skb->len);
714 prmdata[7] = 0xff - (u8) skb->len;
715 return iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
716 (void *) prmdata, 8);
719 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
720 struct msghdr *msg, size_t len)
722 struct sock *sk = sock->sk;
723 struct iucv_sock *iucv = iucv_sk(sk);
725 struct iucv_message txmsg;
726 struct cmsghdr *cmsg;
732 err = sock_error(sk);
736 if (msg->msg_flags & MSG_OOB)
739 /* SOCK_SEQPACKET: we do not support segmented records */
740 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
745 if (sk->sk_shutdown & SEND_SHUTDOWN) {
750 /* Return if the socket is not in connected state */
751 if (sk->sk_state != IUCV_CONNECTED) {
756 /* initialize defaults */
757 cmsg_done = 0; /* check for duplicate headers */
760 /* iterate over control messages */
761 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
762 cmsg = CMSG_NXTHDR(msg, cmsg)) {
764 if (!CMSG_OK(msg, cmsg)) {
769 if (cmsg->cmsg_level != SOL_IUCV)
772 if (cmsg->cmsg_type & cmsg_done) {
776 cmsg_done |= cmsg->cmsg_type;
778 switch (cmsg->cmsg_type) {
779 case SCM_IUCV_TRGCLS:
780 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
785 /* set iucv message target class */
787 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
798 /* allocate one skb for each iucv message:
799 * this is fine for SOCK_SEQPACKET (unless we want to support
800 * segmented records using the MSG_EOR flag), but
801 * for SOCK_STREAM we might want to improve it in future */
802 skb = sock_alloc_send_skb(sk, len, msg->msg_flags & MSG_DONTWAIT,
806 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
811 /* increment and save iucv message tag for msg_completion cbk */
812 txmsg.tag = iucv->send_tag++;
813 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
814 skb_queue_tail(&iucv->send_skb_q, skb);
816 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
818 err = iucv_send_iprm(iucv->path, &txmsg, skb);
820 /* on success: there is no message_complete callback
821 * for an IPRMDATA msg; remove skb from send queue */
823 skb_unlink(skb, &iucv->send_skb_q);
827 /* this error should never happen since the
828 * IUCV_IPRMDATA path flag is set... sever path */
830 iucv_path_sever(iucv->path, NULL);
831 skb_unlink(skb, &iucv->send_skb_q);
836 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
837 (void *) skb->data, skb->len);
841 memcpy(user_id, iucv->dst_user_id, 8);
843 memcpy(appl_id, iucv->dst_name, 8);
844 pr_err("Application %s on z/VM guest %s"
845 " exceeds message limit\n",
848 skb_unlink(skb, &iucv->send_skb_q);
863 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
865 int dataleft, size, copied = 0;
866 struct sk_buff *nskb;
870 if (dataleft >= sk->sk_rcvbuf / 4)
871 size = sk->sk_rcvbuf / 4;
875 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
879 /* copy target class to control buffer of new skb */
880 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
882 /* copy data fragment */
883 memcpy(nskb->data, skb->data + copied, size);
887 skb_reset_transport_header(nskb);
888 skb_reset_network_header(nskb);
891 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
897 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
898 struct iucv_path *path,
899 struct iucv_message *msg)
904 len = iucv_msg_length(msg);
906 /* store msg target class in the second 4 bytes of skb ctrl buffer */
907 /* Note: the first 4 bytes are reserved for msg tag */
908 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
910 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
911 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
912 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
917 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
918 skb->data, len, NULL);
923 /* we need to fragment iucv messages for SOCK_STREAM only;
924 * for SOCK_SEQPACKET, it is only relevant if we support
925 * record segmentation using MSG_EOR (see also recvmsg()) */
926 if (sk->sk_type == SOCK_STREAM &&
927 skb->truesize >= sk->sk_rcvbuf / 4) {
928 rc = iucv_fragment_skb(sk, skb, len);
932 iucv_path_sever(path, NULL);
935 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
937 skb_reset_transport_header(skb);
938 skb_reset_network_header(skb);
943 if (sock_queue_rcv_skb(sk, skb))
944 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
947 static void iucv_process_message_q(struct sock *sk)
949 struct iucv_sock *iucv = iucv_sk(sk);
951 struct sock_msg_q *p, *n;
953 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
954 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
957 iucv_process_message(sk, skb, p->path, &p->msg);
960 if (!skb_queue_empty(&iucv->backlog_skb_q))
965 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
966 struct msghdr *msg, size_t len, int flags)
968 int noblock = flags & MSG_DONTWAIT;
969 struct sock *sk = sock->sk;
970 struct iucv_sock *iucv = iucv_sk(sk);
971 unsigned int copied, rlen;
972 struct sk_buff *skb, *rskb, *cskb;
975 if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
976 skb_queue_empty(&iucv->backlog_skb_q) &&
977 skb_queue_empty(&sk->sk_receive_queue) &&
978 list_empty(&iucv->message_q.list))
981 if (flags & (MSG_OOB))
984 /* receive/dequeue next skb:
985 * the function understands MSG_PEEK and, thus, does not dequeue skb */
986 skb = skb_recv_datagram(sk, flags, noblock, &err);
988 if (sk->sk_shutdown & RCV_SHUTDOWN)
993 rlen = skb->len; /* real length of skb */
994 copied = min_t(unsigned int, rlen, len);
997 if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
998 if (!(flags & MSG_PEEK))
999 skb_queue_head(&sk->sk_receive_queue, skb);
1003 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1004 if (sk->sk_type == SOCK_SEQPACKET) {
1006 msg->msg_flags |= MSG_TRUNC;
1007 /* each iucv message contains a complete record */
1008 msg->msg_flags |= MSG_EOR;
1011 /* create control message to store iucv msg target class:
1012 * get the trgcls from the control buffer of the skb due to
1013 * fragmentation of original iucv message. */
1014 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1015 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1017 if (!(flags & MSG_PEEK))
1018 skb_queue_head(&sk->sk_receive_queue, skb);
1022 /* Mark read part of skb as used */
1023 if (!(flags & MSG_PEEK)) {
1025 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1026 if (sk->sk_type == SOCK_STREAM) {
1027 skb_pull(skb, copied);
1029 skb_queue_head(&sk->sk_receive_queue, skb);
1036 /* Queue backlog skbs */
1037 rskb = skb_dequeue(&iucv->backlog_skb_q);
1039 if (sock_queue_rcv_skb(sk, rskb)) {
1040 skb_queue_head(&iucv->backlog_skb_q,
1044 rskb = skb_dequeue(&iucv->backlog_skb_q);
1047 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1048 spin_lock_bh(&iucv->message_q.lock);
1049 if (!list_empty(&iucv->message_q.list))
1050 iucv_process_message_q(sk);
1051 spin_unlock_bh(&iucv->message_q.lock);
1056 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1057 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1063 static inline unsigned int iucv_accept_poll(struct sock *parent)
1065 struct iucv_sock *isk, *n;
1068 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1069 sk = (struct sock *) isk;
1071 if (sk->sk_state == IUCV_CONNECTED)
1072 return POLLIN | POLLRDNORM;
1078 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1081 struct sock *sk = sock->sk;
1082 unsigned int mask = 0;
1084 poll_wait(file, sk->sk_sleep, wait);
1086 if (sk->sk_state == IUCV_LISTEN)
1087 return iucv_accept_poll(sk);
1089 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1092 if (sk->sk_shutdown & RCV_SHUTDOWN)
1095 if (sk->sk_shutdown == SHUTDOWN_MASK)
1098 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1099 (sk->sk_shutdown & RCV_SHUTDOWN))
1100 mask |= POLLIN | POLLRDNORM;
1102 if (sk->sk_state == IUCV_CLOSED)
1105 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
1108 if (sock_writeable(sk))
1109 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1111 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1116 static int iucv_sock_shutdown(struct socket *sock, int how)
1118 struct sock *sk = sock->sk;
1119 struct iucv_sock *iucv = iucv_sk(sk);
1120 struct iucv_message txmsg;
1125 if ((how & ~SHUTDOWN_MASK) || !how)
1129 switch (sk->sk_state) {
1138 sk->sk_shutdown |= how;
1142 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1145 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
1146 (void *) iprm_shutdown, 8);
1162 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1163 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
1167 skb_queue_purge(&sk->sk_receive_queue);
1170 /* Wake up anyone sleeping in poll */
1171 sk->sk_state_change(sk);
1178 static int iucv_sock_release(struct socket *sock)
1180 struct sock *sk = sock->sk;
1186 iucv_sock_close(sk);
1188 /* Unregister with IUCV base support */
1189 if (iucv_sk(sk)->path) {
1190 iucv_path_sever(iucv_sk(sk)->path, NULL);
1191 iucv_path_free(iucv_sk(sk)->path);
1192 iucv_sk(sk)->path = NULL;
1200 /* getsockopt and setsockopt */
1201 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1202 char __user *optval, int optlen)
1204 struct sock *sk = sock->sk;
1205 struct iucv_sock *iucv = iucv_sk(sk);
1209 if (level != SOL_IUCV)
1210 return -ENOPROTOOPT;
1212 if (optlen < sizeof(int))
1215 if (get_user(val, (int __user *) optval))
1222 case SO_IPRMDATA_MSG:
1224 iucv->flags |= IUCV_IPRMDATA;
1226 iucv->flags &= ~IUCV_IPRMDATA;
1229 switch (sk->sk_state) {
1232 if (val < 1 || val > (u16)(~0))
1235 iucv->msglimit = val;
1251 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1252 char __user *optval, int __user *optlen)
1254 struct sock *sk = sock->sk;
1255 struct iucv_sock *iucv = iucv_sk(sk);
1258 if (level != SOL_IUCV)
1259 return -ENOPROTOOPT;
1261 if (get_user(len, optlen))
1267 len = min_t(unsigned int, len, sizeof(int));
1270 case SO_IPRMDATA_MSG:
1271 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1275 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1276 : iucv->msglimit; /* default */
1280 return -ENOPROTOOPT;
1283 if (put_user(len, optlen))
1285 if (copy_to_user(optval, &val, len))
1292 /* Callback wrappers - called from iucv base support */
1293 static int iucv_callback_connreq(struct iucv_path *path,
1294 u8 ipvmid[8], u8 ipuser[16])
1296 unsigned char user_data[16];
1297 unsigned char nuser_data[16];
1298 unsigned char src_name[8];
1299 struct hlist_node *node;
1300 struct sock *sk, *nsk;
1301 struct iucv_sock *iucv, *niucv;
1304 memcpy(src_name, ipuser, 8);
1305 EBCASC(src_name, 8);
1306 /* Find out if this path belongs to af_iucv. */
1307 read_lock(&iucv_sk_list.lock);
1310 sk_for_each(sk, node, &iucv_sk_list.head)
1311 if (sk->sk_state == IUCV_LISTEN &&
1312 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1314 * Found a listening socket with
1315 * src_name == ipuser[0-7].
1320 read_unlock(&iucv_sk_list.lock);
1322 /* No socket found, not one of our paths. */
1327 /* Check if parent socket is listening */
1328 low_nmcpy(user_data, iucv->src_name);
1329 high_nmcpy(user_data, iucv->dst_name);
1330 ASCEBC(user_data, sizeof(user_data));
1331 if (sk->sk_state != IUCV_LISTEN) {
1332 err = iucv_path_sever(path, user_data);
1333 iucv_path_free(path);
1337 /* Check for backlog size */
1338 if (sk_acceptq_is_full(sk)) {
1339 err = iucv_path_sever(path, user_data);
1340 iucv_path_free(path);
1344 /* Create the new socket */
1345 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1347 err = iucv_path_sever(path, user_data);
1348 iucv_path_free(path);
1352 niucv = iucv_sk(nsk);
1353 iucv_sock_init(nsk, sk);
1355 /* Set the new iucv_sock */
1356 memcpy(niucv->dst_name, ipuser + 8, 8);
1357 EBCASC(niucv->dst_name, 8);
1358 memcpy(niucv->dst_user_id, ipvmid, 8);
1359 memcpy(niucv->src_name, iucv->src_name, 8);
1360 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1363 /* Call iucv_accept */
1364 high_nmcpy(nuser_data, ipuser + 8);
1365 memcpy(nuser_data + 8, niucv->src_name, 8);
1366 ASCEBC(nuser_data + 8, 8);
1368 /* set message limit for path based on msglimit of accepting socket */
1369 niucv->msglimit = iucv->msglimit;
1370 path->msglim = iucv->msglimit;
1371 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1373 err = iucv_path_sever(path, user_data);
1374 iucv_path_free(path);
1375 iucv_sock_kill(nsk);
1379 iucv_accept_enqueue(sk, nsk);
1381 /* Wake up accept */
1382 nsk->sk_state = IUCV_CONNECTED;
1383 sk->sk_data_ready(sk, 1);
1390 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1392 struct sock *sk = path->private;
1394 sk->sk_state = IUCV_CONNECTED;
1395 sk->sk_state_change(sk);
1398 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1400 struct sock *sk = path->private;
1401 struct iucv_sock *iucv = iucv_sk(sk);
1402 struct sk_buff *skb;
1403 struct sock_msg_q *save_msg;
1406 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1407 iucv_message_reject(path, msg);
1411 spin_lock(&iucv->message_q.lock);
1413 if (!list_empty(&iucv->message_q.list) ||
1414 !skb_queue_empty(&iucv->backlog_skb_q))
1417 len = atomic_read(&sk->sk_rmem_alloc);
1418 len += iucv_msg_length(msg) + sizeof(struct sk_buff);
1419 if (len > sk->sk_rcvbuf)
1422 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1426 iucv_process_message(sk, skb, path, msg);
1430 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1433 save_msg->path = path;
1434 save_msg->msg = *msg;
1436 list_add_tail(&save_msg->list, &iucv->message_q.list);
1439 spin_unlock(&iucv->message_q.lock);
1442 static void iucv_callback_txdone(struct iucv_path *path,
1443 struct iucv_message *msg)
1445 struct sock *sk = path->private;
1446 struct sk_buff *this = NULL;
1447 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1448 struct sk_buff *list_skb = list->next;
1449 unsigned long flags;
1451 if (!skb_queue_empty(list)) {
1452 spin_lock_irqsave(&list->lock, flags);
1454 while (list_skb != (struct sk_buff *)list) {
1455 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1459 list_skb = list_skb->next;
1462 __skb_unlink(this, list);
1464 spin_unlock_irqrestore(&list->lock, flags);
1470 if (sk->sk_state == IUCV_CLOSING) {
1471 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1472 sk->sk_state = IUCV_CLOSED;
1473 sk->sk_state_change(sk);
1479 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1481 struct sock *sk = path->private;
1483 if (!list_empty(&iucv_sk(sk)->accept_q))
1484 sk->sk_state = IUCV_SEVERED;
1486 sk->sk_state = IUCV_DISCONN;
1488 sk->sk_state_change(sk);
1491 /* called if the other communication side shuts down its RECV direction;
1492 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1494 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1496 struct sock *sk = path->private;
1499 if (sk->sk_state != IUCV_CLOSED) {
1500 sk->sk_shutdown |= SEND_SHUTDOWN;
1501 sk->sk_state_change(sk);
1506 static struct proto_ops iucv_sock_ops = {
1508 .owner = THIS_MODULE,
1509 .release = iucv_sock_release,
1510 .bind = iucv_sock_bind,
1511 .connect = iucv_sock_connect,
1512 .listen = iucv_sock_listen,
1513 .accept = iucv_sock_accept,
1514 .getname = iucv_sock_getname,
1515 .sendmsg = iucv_sock_sendmsg,
1516 .recvmsg = iucv_sock_recvmsg,
1517 .poll = iucv_sock_poll,
1518 .ioctl = sock_no_ioctl,
1519 .mmap = sock_no_mmap,
1520 .socketpair = sock_no_socketpair,
1521 .shutdown = iucv_sock_shutdown,
1522 .setsockopt = iucv_sock_setsockopt,
1523 .getsockopt = iucv_sock_getsockopt,
1526 static struct net_proto_family iucv_sock_family_ops = {
1528 .owner = THIS_MODULE,
1529 .create = iucv_sock_create,
1532 static int __init afiucv_init(void)
1536 if (!MACHINE_IS_VM) {
1537 pr_err("The af_iucv module cannot be loaded"
1539 err = -EPROTONOSUPPORT;
1542 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1543 if (unlikely(err)) {
1545 err = -EPROTONOSUPPORT;
1549 err = iucv_register(&af_iucv_handler, 0);
1552 err = proto_register(&iucv_proto, 0);
1555 err = sock_register(&iucv_sock_family_ops);
1561 proto_unregister(&iucv_proto);
1563 iucv_unregister(&af_iucv_handler, 0);
1568 static void __exit afiucv_exit(void)
1570 sock_unregister(PF_IUCV);
1571 proto_unregister(&iucv_proto);
1572 iucv_unregister(&af_iucv_handler, 0);
1575 module_init(afiucv_init);
1576 module_exit(afiucv_exit);
1578 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1579 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1580 MODULE_VERSION(VERSION);
1581 MODULE_LICENSE("GPL");
1582 MODULE_ALIAS_NETPROTO(PF_IUCV);